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1

Measured Off-Grid LED Lighting System Performance  

E-Print Network (OSTI)

Market in Western Kenya: LED Alternatives and Consumerfor Emerging Off-grid White-LED Illumination Systems forReport #4 Measured Off-Grid LED Lighting System Performance

Granderson, Jessica

2009-01-01T23:59:59.000Z

2

Optimization of Electric Power Systems for Off-Grid Domestic Applications: An Argument for Wind/Photovoltaic Hybrids  

SciTech Connect

The purpose of this research was to determine the optimal configuration of home power systems relevant to different regions in the United States. The hypothesis was that, regardless of region, the optimal system would be a hybrid incorporating wind technology, versus a photovoltaic hybrid system without the use of wind technology. The method used in this research was HOMER, the Hybrid Optimization Model for Electric Renewables. HOMER is a computer program that optimizes electrical configurations under user-defined circumstances. According to HOMER, the optimal system for the four regions studied (Kansas, Massachusetts, Oregon, and Arizona) was a hybrid incorporating wind technology. The cost differences between these regions, however, were dependent upon regional renewable resources. Future studies will be necessary, as it is difficult to estimate meteorological impacts for other regions.

Jennings, W.; Green, J.

2001-01-01T23:59:59.000Z

3

Measured Off-Grid LED Lighting System Performance  

E-Print Network (OSTI)

The Specter of Fuel-Based Lighting," Science 308:1263-1264.Mills. 2008. "Solid-State Lighting on a Shoestring Budget:The Economics of Off-Grid Lighting for Small Businesses in

Granderson, Jessica

2009-01-01T23:59:59.000Z

4

A Control Strategy for Off-Grid Solar Photovoltaic Power System Based on MPPT Algorithm  

Science Conference Proceedings (OSTI)

Off-grid solar photovoltaic (PV) power system characteristics are used widely in many far-away areas during theses years. The new control strategy employs Maximum Power Point Tracking (MPPT) algorithm. The maximum power point tracker is a high efficiency ... Keywords: off-grid solar photovoltaic power system, maximum power point tracking algorithm, perturbation and observation control method

Tianjian Wang; Xia Dang; Dong Liu

2012-10-01T23:59:59.000Z

5

Off-Grid or Stand-Alone Renewable Energy Systems | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Off-Grid or Stand-Alone Renewable Energy Systems Off-Grid or Stand-Alone Renewable Energy Systems Off-Grid or Stand-Alone Renewable Energy Systems July 2, 2012 - 8:20pm Addthis Off-grid, or stand-alone, systems can be more cost-effective than connecting to the grid in remote locations. | Photo courtesy of Dave Parsons. Off-grid, or stand-alone, systems can be more cost-effective than connecting to the grid in remote locations. | Photo courtesy of Dave Parsons. What are the key facts? In remote locations, stand-alone systems can be more cost-effective than extending a power line to the electricity grid. Stand-alone systems are also used by people who live near the grid but are looking for independence from the power provider or to demonstrate a commitment to non-polluting energy sources. Batteries, and other additional equipment, are required with

6

Introduction to off grid energy options for RE systems | Open Energy  

Open Energy Info (EERE)

Introduction to off grid energy options for RE systems Introduction to off grid energy options for RE systems Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Introduction to off grid energy options for RE systems Agency/Company /Organization: Alternative Energy Sector: Energy Focus Area: Renewable Energy Phase: Evaluate Options Topics: Co-benefits assessment, - Energy Access Resource Type: Guide/manual User Interface: Website Website: www.altenergy.org/Glossary/intro.html Cost: Free Language: English This guide is designed to help those who require modern energy-consuming equipment in off-grid areas and who must select appropriate power equipment. Rural development is greatly enhanced by the availability of decent lighting, pumping, refrigeration and audio-visual/communication tools. There is a wide variety of equipment available to meet these needs.

7

Energy System Development inAfrica: The case of grid and off-grid power inKenya  

E-Print Network (OSTI)

Africa: The case of grid and off-grid power inKenya Acknowledgements I have been lucky to spend the past five yearsEnergy System Development inAfrica: The case of grid and off-grid power inKenya By Katherine Deaton Development inAfrica: The case of grid and off-grid power inKenya Energy System Development inAfrica: The case

de Weck, Olivier L.

8

COMPRESSED-AIR ENERGY STORAGE SYSTEMS FOR STAND-ALONE OFF-GRID PHOTOVOLTAIC MODULES  

E-Print Network (OSTI)

-storage materials, flywheels, pumped hydro (PH), superconducting magnetic energy storage (SMES) and compressed airCOMPRESSED-AIR ENERGY STORAGE SYSTEMS FOR STAND-ALONE OFF-GRID PHOTOVOLTAIC MODULES Dominique, USA ABSTRACT In this work, a low-cost, low-volume, low-maintenance, small-scale compressed-air energy

Deymier, Pierre

9

Ocean Wave Energy-Driven Desalination Systems for Off-grid Coastal Communities in Developing Countries  

Science Conference Proceedings (OSTI)

Resolute Marine Energy, Inc. (RME) is based in Boston, MA and is developing ocean wave energy converters (WECs) to benefit remote off-grid communities in developing nations. Our two WEC technologies are based on the heaving and surging motion of a buoy ... Keywords: ocean wave energy, renewable energy, desalination, water, coastal communities

Eshwan Ramudu

2011-10-01T23:59:59.000Z

10

Energy system development in Africa : the case of grid and off-grid power in Kenya  

E-Print Network (OSTI)

This research used a combination of a grounded theory approach and system dynamics to study the electric power system in Kenya and to model the feedback at work in the development of the system. The ethnographic study ...

Steel, Katherine Deaton

2008-01-01T23:59:59.000Z

11

Market Trial: Selling Off-Grid Lighting Products in Rural Kenya  

Science Conference Proceedings (OSTI)

In this study, we performed a market trial of off-grid LED lighting products in Maai Mahiu, arural Kenyan town. Our goals were to assess consumer demand and consumer preferences with respect to off-grid lighting systems and to gain feedback from off-grid lighting users at the point of purchase and after they have used to products for some time.

Tracy, Jennifer; Alstone, Peter; Jacobson, Arne; Mills, Evan

2010-06-21T23:59:59.000Z

12

Off-grid Power for Small Communities with Renewable Energy Sources in Rural Guatemalan Villages  

Science Conference Proceedings (OSTI)

Abstract--This paper describes the process used to plan, design, and implement an off-grid electrical system for a village with less than 50 homes in rural Guatemala. The community has a small school, community center, community kitchen, and 43 homes/families. ... Keywords: photovoltaic, hydroelectric, Guatemala, battery, EWB, Engineers Without Borders, solar energy, microhydro, off-grid.

Eugene D. Moe; Andrea P. Moe

2011-10-01T23:59:59.000Z

13

Assessing the Performance of LED-Based Flashlights Available in the Kenyan Off-Grid Lighting Market  

E-Print Network (OSTI)

of emerging off-grid White-LED illumination systems, Light &Assessing the Performance of LED-Based Flashlights Availableflashlights that use LED technology are increasingly

Tracy, Jennifer

2010-01-01T23:59:59.000Z

14

Small Wind Guidebook/Can I Go Off-Grid | Open Energy Information  

Open Energy Info (EERE)

Can I Go Off-Grid Can I Go Off-Grid < Small Wind Guidebook Jump to: navigation, search Print PDF WIND ENERGY STAKEHOLDER ENGAGEMENT & OUTREACHSmall Wind Guidebook Home WindTurbine-icon.png Small Wind Guidebook * Introduction * First, How Can I Make My Home More Energy Efficient? * Is Wind Energy Practical for Me? * What Size Wind Turbine Do I Need? * What Are the Basic Parts of a Small Wind Electric System? * What Do Wind Systems Cost? * Where Can I Find Installation and Maintenance Support? * How Much Energy Will My System Generate? * Is There Enough Wind on My Site? * How Do I Choose the Best Site for My Wind Turbine? * Can I Connect My System to the Utility Grid? * Can I Go Off-Grid? * State Information Portal * Glossary of Terms * For More Information Can I Go "Off-Grid"?

15

Embodied Energy and Off-Grid Lighting  

Science Conference Proceedings (OSTI)

The greenhouse gas (GHG) emissions from fuel-based lighting are substantial given the paltry levels of lighting service provided to users, leading to a great opportunity for GHG mitigation byencouraging the switch from fuel-based to rechargeable LED lighting. However, as with most new energy technology, switching to efficient lighting requires an up-front investment of energy(and GHGs) embedded in the manufacture of replacement components. We studied a population of off-grid lighting users in 2008-2009 in Kenya who were given the opportunity to adopt LEDlighting. Based on their use patterns with the LED lights and the levels of kerosene offset we observed, we found that the embodied energy of the LED lamp was"paid for" in only one month for grid charged products and two months for solar charged products. Furthermore, the energyreturn-on investment-ratio (energy produced or offset over the product's service life divided by energy embedded) for off-grid LED lighting ranges from 12 to 24, which is on par with on-gridsolar and large-scale wind energy. We also found that the energy embodied in the manufacture of a typical hurricane lantern is about one-half to one-sixth of that embodied in the particular LEDlights that we evaluated, indicating that the energy payback time would be moderately faster if LEDs ultimately displace the production of kerosene lanterns. As LED products improve, weanticipate longer service lives and more successful displacement of kerosene lighting, both of which will speed the already rapid recovery of embodied energy in these products. Our studyprovides a detailed appendix with embodied energy values for a variety of components used to construct off-grid LED lighting, which can be used to analyze other products.

Alstone, Peter; Mills, Evan; Jacobson, Arne

2011-01-25T23:59:59.000Z

16

Optimal operational strategy for hybrid renewable energy system using genetic algorithms  

Science Conference Proceedings (OSTI)

Off-grid settlements require efficient, reliable and cost-effective renewable energy as alternative to the power supplied by diesel generator. Techno-economic analysis is required to find the optimum renewable energy system in the long run. This paper ... Keywords: genetic algorithm, hybrid system, operation strategy, optimization, renewable energy

Juhari Ab. Razak; Kamaruzzaman Sopian; Zulkifli Mohd Nopiah; Azami Zaharim; Yusoff Ali

2007-12-01T23:59:59.000Z

17

Optimal operational strategy for hybrid renewable energy system using genetic algorithms  

Science Conference Proceedings (OSTI)

Off-grid settlements require efficient, reliable and cost-effective renewable energy as alternative to the power supplied by diesel generator. Techno-economic analysis is required to find the optimum renewable energy system in the long run. This paper ... Keywords: genetic algorithms, hybrid system, operation strategy, optimization, renewable energy

Kamaruzzaman Sopian; Azami Zaharim; Yusoff Ali; Zulkifli Mohd Nopiah; Juhari Ab. Razak; Nor Salim Muhammad

2008-04-01T23:59:59.000Z

18

Product Quality Assurance for Off-Grid Lighting in Africa  

SciTech Connect

Although the emergence of markets for high efficiency off-grid lighting technologies holds promise, realizing the potential of this opportunity on a long-term, sustainable basis requires careful attention to issues of product quality, consumer protection, and the potential for significant 'market spoiling', in anticipation of increases of sales of low cost, low performance off-grid lighting products. The goal of the Lighting Africa quality assurance workshop was to articulate strategies to mitigate the dangers of market spoiling and to explore ways to protect consumers from misleading advertising for sales of inferior, off-grid lighting products in the context of Lighting Africa's overarching objective to support the industry in developing a robust off-grid lighting market in Africa. The workshop resulted in the identification of two strategic approaches for meeting Lighting Africa quality assurance programmatic needs. The first strategy is intended to meet a short-term programmatic need for quality associated with requests for lighting products by bulk procurement agents, such as in a World Bank-financed project. The development of procurement specifications and test procedures that could be used in a quality/usability screening method in order to provide guidance for forthcoming large volume purchases emerged as the best solution to meet this need. Such approaches are used in World Bank-financed solar home systems (SHSs) projects in Bangladesh, Sri Lanka, and China, among others. However, unlike the SHSs which have multiple balance-of-system (BOS) components warranting the need for an array of specifications for individual components, stand alone lighting systems require specifications that are amenable to individual light points. To test this approach, Lighting Africa elected to use the technical specifications issued by the Photovoltaic Global Approval Program for solar lanterns that use CFL bulbs (PVRS11A) as the basis of qualifying such products. A contract has been competitively awarded to the Global Approval Program for Photovoltaics (PV GAP) under the Lighting Africa Program to select and test ten solar lantern product models. Lantern selection will be determined based on a number of criteria, among them, the ability to provide a daily duty cycle of at least 3 hours of light, the number of days of autonomy of battery, the volume of sales (especially in Africa), and whether or not the manufacturing facility is ISO 9000 certified. Those that are confirmed as meeting the specifications may be eligible to receive a PVGAP quality seal. The work is being carried out in partnership with the Photovoltaic and Wind Quality Test Center in Beijing, China and TUV Rhineland in Koeln, Germany. As off-grid LED-based stand-alone lighting products is in a nascent stage of development compared to CFL-based lanterns, Lighting Africa will support the development of a 'Quality Screening' approach to selecting LED lighting, in order not to delay consumers benefiting from such advances. The screening methodology could be used by procurement agencies to qualify LED lighting products for bulk or programmatic procurements. The main elements of this work comprises of developing a procurement specification and test procedure for undertaking a 'quick' quality/usability screening to be used for procuring LED lights and to test up to 30 LED-based lights to screen products that meet the requirement. The second strategy is intended to meet a longer-term need associated with creating a self-sustaining product quality assurance program that will effectively protect the African consumer, prevent significant market spoiling, adapt with expected technological advancements over the long-term--in other words, give consumers the ability to detect quality products and the information needed to find products that meet their specific needs from among the myriad of lighting products that become available commercially. Workshop discussions and the discussions evolving from the workshop led the Lighting Africa team to opt for an approach similar to that of th

World Bank; Mills, Evan; Mills, Evan

2008-07-13T23:59:59.000Z

19

Illumination Sufficiency Survey Techniques: In-situ Measurements of Lighting System Performance and a User Preference Survey for Illuminance in an Off-Grid, African Setting  

Science Conference Proceedings (OSTI)

Efforts to promote rechargeable electric lighting as a replacement for fuel-based light sources in developing countries are typically predicated on the notion that lighting service levels can be maintained or improved while reducing the costs and environmental impacts of existing practices. However, the extremely low incomes of those who depend on fuel-based lighting create a need to balance the hypothetically possible or desirable levels of light with those that are sufficient and affordable. In a pilot study of four night vendors in Kenya, we document a field technique we developed to simultaneously measure the effectiveness of lighting service provided by a lighting system and conduct a survey of lighting service demand by end-users. We took gridded illuminance measurements across each vendor's working and selling area, with users indicating the sufficiency of light at each point. User light sources included a mix of kerosene-fueled hurricane lanterns, pressure lamps, and LED lanterns.We observed illuminance levels ranging from just above zero to 150 lux. The LED systems markedly improved the lighting service levels over those provided by kerosene-fueled hurricane lanterns. Users reported that the minimum acceptable threshold was about 2 lux. The results also indicated that the LED lamps in use by the subjects did not always provide sufficient illumination over the desired retail areas. Our sample size is much too small, however, to reach any conclusions about requirements in the broader population. Given the small number of subjects and very specific type of user, our results should be regarded as indicative rather than conclusive. We recommend replicating the method at larger scales and across a variety of user types and contexts. Policymakers should revisit the subject of recommended illuminance levels regularly as LED technology advances and the price/service balance point evolves.

Alstone, Peter; Jacobson, Arne; Mills, Evan

2010-08-26T23:59:59.000Z

20

Technical and Economic Assessment of Off-grid, Mini-grid and...  

Open Energy Info (EERE)

Technical and Economic Assessment of Off-grid, Mini-grid and Grid Electrification Technologies Jump to: navigation, search Name Technical and Economic Assessment of Off-grid,...

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Performance Analysis of Off-Grid Micro WECS in Harsh  

E-Print Network (OSTI)

wind power at off-grid sites · Motivated by high cost and environmental risk of traditional diesel Labrador · Originally powered solely by diesel generators with battery bank · Solar power introduced at sites in early 1990's · Wind power installation began in 2003 #12;4/19 Background · Now implementing

Bruneau, Steve

22

Off-grid Energy in Rural India: Policy Recommendations for  

E-Print Network (OSTI)

either benefit from energy access or supply their communities with energy services. #12;Lacayo 3 Timeline and domestic use, and small scale industry, as shown in table 1. Most of the energy needs in rural areasLacayo 1 Off-grid Energy in Rural India: Policy Recommendations for Effective UN Projects Antonio I

Mauzerall, Denise

23

RIGHT SIZING AN OFF-GRID SOLAR HOUSE Eleventh International IBPSA Conference Glasgow, Scotland  

E-Print Network (OSTI)

Power reliability is one of the biggest concerns for people living off-grid. Current practice in off-grid solar house tends to either oversize solar power system or oversize the backup generator to ensure available electricity at all times, which often leads to a high system capital cost. Research has shown that right-sizing is essential to achieve a more efficient system with reduced energy consumption. Sound, responsible system sizing can only happen when liability issues become part of the design methodology, i.e. actively communicating with prospective owners/occupants regarding the risk that the thermal comfort, and full time use of appliances cannot be fully guaranteed. The risk of nonfulfilments may be related to extraordinary environmental conditions for a certain amount of time of the year, the chance that certain components will fail for some reason, and the fact that predictions of the operation of houses are based on design idealizations, whereas its real operation is to some degree uncertain. This paper presents a value-based approach to find the balancing point between the acceptable reliability level and the affordable system capital cost. The value-based approach is illustrated through a sizing practice of an existing off-grid solar house in Atlanta, GA.

Huafen Hu; Godfried Augenbroe

2009-01-01T23:59:59.000Z

24

Economics and performance of PV hybrid power systems: Three case studies  

DOE Green Energy (OSTI)

The Photovoltaic Systems Assistance Center (PVSAC) of Sandia National Laboratories (SNL) has been supporting the development and implementation of off-grid PV hybrid power systems for many years. Technical support has included: refining hardware; understanding system design techniques; obtaining operation and maintenance data; studying use of energy produced. As part of the program, the PVSAC has provided technical expertise on hybrid systems to many federal agencies including the National Park Service, the Forest Service, the Bureau of Land Management, and the Department of Defense. The goal of these partnerships has been to ensure that reliable and safe PV hybrid systems are specified and procured. At present, a critical review of performance and costs of several representative PV hybrid systems is underway. This paper presents a summary of the performance and economical analyses conducted on three PV hybrid systems.

Rosenthal, A.L.; Durand, S.J. [Southwest Technology Development Inst., Las Cruces, NM (United States); Thomas, M.G.; Post, H.N. [Sandia National Labs., Albuquerque, NM (United States)

1998-07-01T23:59:59.000Z

25

Economic analysis of PV hybrid power system: Pinnacles National Monument  

DOE Green Energy (OSTI)

PV hybrid electric power systems can offer an economically competitive alternative to engine generator (genset) systems in many off-grid applications. Besides the obvious `green` advantages of producing less noise and emissions, the PV hybrid can, in some cases, offer a lower life-cycle cost (LCC) then the genset. This paper evaluates the LCC of the 9.6 kWp PV hybrid power system installed by the National Park Services (NPS) at Pinnacles National Monument, CA. NPS motivation for installation of this hybrid was not based on economics, but rather the need to replace two aging diesel gensets with an alternative that would be quieter, fuel efficient, and more in keeping with new NPS emphasis on sustainable design and operations. In fact, economic analysis shows a lower 20-year LCC for the installed PV hybrid than for simple replacement of the two gensets. The analysis projects are net savings by the PV hybrid system of $83,561 and over 162,000 gallons of propane when compared with the genset-only system. This net savings is independent of the costs associated with environmental emissions. The effects of including emissions costs, according to NPS guidelines, is also discussed. 5 refs., 2 figs., 3 tabs.

Rosenthal, A.; Durand, S. [Southwest Technology Development Institute, Las Cruces, NM (United States); Thomas, M.; Post, H. [Sandia National Labs., Albuquerque, NM (United States)

1997-11-01T23:59:59.000Z

26

OFF-GRID RENEWABLE ENERGY OPTIONS FOR RURAL ELECTRIFICATION IN WESTERN CHINA  

E-Print Network (OSTI)

OFF-GRID RENEWABLE ENERGY OPTIONS FOR RURAL ELECTRIFICATION IN WESTERN CHINA by the Center for Energy and Environmental Policy of University of Delaware Sponsored by National Renewable Energy Laboratory and Ministry of Agriculture People's Republic of China June 2001 #12;i OFF-GRID RENEWABLE ENERGY

Delaware, University of

27

Event:First International Off-Grid Renewable Energy Conference | Open  

Open Energy Info (EERE)

Off-Grid Renewable Energy Conference Off-Grid Renewable Energy Conference Jump to: navigation, search Calendar.png First International Off-Grid Renewable Energy Conference: on 2012/11/01 "The Alliance for Rural Electrification (ARE), the ECOWAS Regional Centre for Renewable Energy and Energy Efficiency (ECREEE) and the International Renewable Energy Agency (IRENA) are jointly organising the 1st International Off-grid Renewable Energy Conference, an official contribution to the UN Sustainable Energy for All Initiative. This Conference will be the first major international event focusing on off-grid renewables in developing countries with a special focus on Africa. With the objective of increasing the collaboration between public authorities and the private sector, the Conference's participants will collectively

28

Solid-State Lighting on a Shoestring Budget: The Economics of Off-Grid Lighting for Small Businesses in Kenya  

E-Print Network (OSTI)

Report #3 Solid-State Lighting on a Shoestring Budget:The Economics of Off-Grid Lighting for Small Businesses inProject includes an Off-Grid Lighting Technology Assessment

Radecsky, Kristen

2009-01-01T23:59:59.000Z

29

Technical and Economic Assessment of Off-grid, Mini-grid and Grid  

Open Energy Info (EERE)

Technical and Economic Assessment of Off-grid, Mini-grid and Grid Technical and Economic Assessment of Off-grid, Mini-grid and Grid Electrification Technologies Jump to: navigation, search Tool Summary Name: Technical and Economic Assessment of Off-grid, Mini-grid and Grid Electrification Technologies Agency/Company /Organization: World Bank Sector: Energy Focus Area: Energy Efficiency Topics: Resource assessment, Technology characterizations Website: siteresources.worldbank.org/EXTENERGY/Resources/336805-1157034157861/E References: Technical and Economic Assessment of Off-grid, Mini-grid and Grid Electrification Technologies[1] Summary "This report is part of the Energy and Water Department's commitment to providing new techniques and knowledge which complement the direct investment and other assistance to electrification as provided by the

30

Hybrid Cooling Systems  

Science Conference Proceedings (OSTI)

Water consumption by power plants has become an increasingly contentious siting issue. In nearly all fossil-fired and nuclear plants, water for plant cooling is by far the greatest water requirement. Therefore, the use of water-conserving cooling systems such as dry or hybrid cooling is receiving increasing attention. This technology overview from the Electric Power Research Institute (EPRI) provides a brief introduction to hybrid cooling systems. As defined in the report, the term "hybrid cooling" refer...

2011-11-23T23:59:59.000Z

31

Hybrid Systems Diagnosis  

Science Conference Proceedings (OSTI)

This paper reports on an on-going project to investigate techniques to diagnose complex dynamical systems that are modeled as hybrid systems. In particular, we examine continuous systems with embedded supervisory controllers that experience abrupt, partial ...

Sheila A. McIlraith; Gautam Biswas; Dan Clancy; Vineet Gupta

2000-03-01T23:59:59.000Z

32

An Analysis of Off-Grid, Off-Pipe Housing in Six U.S. Climates  

E-Print Network (OSTI)

This dissertation addresses the issues of climate change and depletion of non-renewable resources of energy and water, and aims at eliminating the use of non-renewable resources of energy and water for the building operation in single-family detached residences in the U.S. With this aim, this study investigated the feasibility of the off-grid, off-pipe design approach in six climate locations across the U.S. to achieve self-sufficiency in a house for building energy, indoor water use, and household wastewater and sewage disposal using only on-site available renewable resources. For the analysis, a 2,500 ft2, 2000/2001 International Energy Conservation Code standard reference house with typical building and usage characteristics was selected as the base case. The six U.S. climate locations included: Minneapolis, MN, Boulder, CO, Atlanta, GA, Houston, TX, Phoenix, AZ, and Los Angeles, CA. The renewable resources considered for this study included: solar radiation, wind, biomass for building energy needs; rainwater for indoor water use. In addition, the building site was considered for the disposal of household wastewater and sewage. The selected climate locations provided different scenarios in terms of base-case building energy needs and availability of renewable resources. Depending on these, energy and water efficiency measures were selected for reducing the building needs. For the reduced building needs, the sizing of systems for self-sufficiency was performed, including: solar thermal system for buildings space heating and water heating needs, photovoltaic and wind power systems for buildings electricity needs; rainwater harvesting system for indoor water needs; and septic system for the on-site disposal of household wastewater and sewage. In this manner, an integrated analysis procedure was developed for the analysis and design of off-grid, off-pipe homes, and was demonstrated for six U.S. climate locations. The results of the analysis indicated that achieving self-sufficiency for energy, water and sewage disposal was possible in all climates provided the systems for the collection and storage of renewable resources were large. On the other hand, the utilization of these systems was small for locations, where the year-to-year and seasonal variations in the weather conditions and availability of climate resources was large. For increased system utilization, minimization of the peak building needs, utilization of harvested energy for secondary purposes, and considering alternative systems for such applications are preferred.

Malhotra, Mini

2009-12-01T23:59:59.000Z

33

An Analysis of Off-grid, Off-pipe Housing in Six U.S. Climates  

E-Print Network (OSTI)

This dissertation addresses the issues of climate change and depletion of non-renewable resources of energy and water, and aims at eliminating the use of non-renewable resources of energy and water for the building operation in single-family detached residences in the U.S. With this aim, this study investigated the feasibility of the off-grid, off-pipe design approach in six climate locations across the U.S. to achieve self-sufficiency in a house for building energy, indoor water use, and household wastewater and sewage disposal using only on-site available renewable resources. For the analysis, a 2,500 ft2, 2000/2001 International Energy Conservation Code standard reference house with typical building and usage characteristics was selected as the base case. The six U.S. climate locations included: Minneapolis, MN, Boulder, CO, Atlanta, GA, Houston, TX, Phoenix, AZ, and Los Angeles, CA. The renewable resources considered for this study included: solar radiation, wind, biomass for building energy needs; rainwater for indoor water use. In addition, the building site was considered for the disposal of household wastewater and sewage. The selected climate locations provided different scenarios in terms of base-case building energy needs and availability of renewable resources. Depending on these, energy and water efficiency measures were selected for reducing the building needs. For the reduced building needs, the sizing of systems for self-sufficiency was performed, including: solar thermal system for buildings space heating and water heating needs, photovoltaic and wind power systems for buildings electricity needs; rainwater harvesting system for indoor water needs; and septic system for the on-site disposal of household wastewater and sewage. In this manner, an integrated analysis procedure was developed for the analysis and design of off-grid, off-pipe homes, and was demonstrated for six U.S. climate locations. The results of the analysis indicated that achieving self-sufficiency for energy, water and sewage disposal was possible is all climates provided the systems for the collection and storage of renewable resources were large. On the other hand, the utilization of these systems was small for locations, where the year-to-year and seasonal variations in the weather conditions and availability of climate resources was large. For increased system utilization, minimization of the peak building needs, utilization of harvested energy for secondary purposes, and considering alternative systems for such applications are preferred.

Malhotra, Mini

2009-12-01T23:59:59.000Z

34

Hybrid Systems Architectures  

E-Print Network (OSTI)

ion suppression of lower-level information not relevant for the current task Encapsulation (information hiding) implementation details are hidden, only interface information is visible F. Kurfe Hybrid System Architectures ASHS '96 37 Inheritance common characteristics are derived from ancestors Polymorphism appropriate instances of classes and operators can be selected at runtime Advantages ffl very flexible ffl suitable for large systems ffl support reuse Problems ffl handling of new and atypical situations ffl quite complex ffl formal verification F. Kurfe Hybrid System Architectures ASHS '96 38 Expert System What is an Expert System? Basic concepts ffl designer / user supplies facts and information ffl user asks queries and receives expert advice ffl limited to a problem domain (knowledge domain) Components ffl user interface ffl knowledge base ffl inference mechanism Synonyms: knowledge-based system, knowledge-based expert system F. Kurfe Hybrid System Archi...

Franz J. Kurfe

1996-01-01T23:59:59.000Z

35

ANALYSIS OF OFF-GRID, OFF-PIPE HOUSING FOR HOT-HUMID AND HOT-ARID CLIMATES  

E-Print Network (OSTI)

This paper investigates the feasibility of off-grid, off-pipe housing in hot-humid and hot-arid climates in the U.S. The study aims to eliminate the need for non-renewable sources of energy and municipal water in residences by using off-grid, off-pipe design approach. To accomplish this, a 2001 International Energy Conservation Code compliant house in Houston, TX and Phoenix, AZ was simulated to determine the base-case energy and water use. Based on the availability of on-site renewable energy and water sources (i.e., solar, wind and biomass and rainfall) in these locations, energy and water efficiency measures were selected in order to reduce the energy and water use to a level that could be met solely by on-site renewable resources. Finally, the sizing of the renewable energy and rainwater harvesting systems was performed to provide for daily needs as well as cumulative needs during the critical periods, in order to achieve complete self sufficiency in terms of energy and water use. The analysis was performed by integrating the results of DOE-2.1e, F-Chart and PV F-Chart programs, and cumulative rainwater supply and water demand analysis. The simulation results demonstrate the differences between the priorities for energy efficiency, water-efficiency and renewable energy measures in hot-humid and hot-arid climates.

Malhotra, M.; Haberl, J.

2008-12-01T23:59:59.000Z

36

Off-grid Direction of Arrival Estimation Using Sparse Bayesian Inference  

E-Print Network (OSTI)

This paper is focused on solving the narrowband direction of arrival estimation problem from a sparse signal reconstruction perspective. Existing sparsity-based methods have shown advantages over conventional ones but exhibit limitations in practical situations where the true directions are not in the sampling grid. A so-called off-grid model is broached to reduce the modeling error caused by the off-grid directions. An iterative algorithm is proposed in this paper to solve the resulting problem from a Bayesian perspective while joint sparsity among different snapshots is exploited by assuming the same Laplace prior. Like existing sparsity-based methods, the new approach applies to arbitrary sensor array and exhibits increased resolution and improved robustness to noise and source correlation. Moreover, our approach results in more accurate direction of arrival estimation, e.g., smaller bias and lower mean squared error. High precision can be obtained with a coarse sampling grid and, meanwhile, computational ...

Yang, Zai; Zhang, Cishen

2011-01-01T23:59:59.000Z

37

Hybrid Geothermal Heat Pump Systems  

Science Conference Proceedings (OSTI)

Hybrid geothermal heat pump systems offer many of the benefits of full geothermal systems but at lower installed costs. A hybrid geothermal system combines elements of a conventional water loop heat pump system in order to reduce the geothermal loop heat exchanger costs, which are probably the largest cost element of a geothermal system. These hybrid systems have been used successfully where sufficient ground space to install large heat exchangers for full geothermal options was unavailable, or where the...

2009-12-21T23:59:59.000Z

38

Global optimization of hybrid systems  

E-Print Network (OSTI)

Systems that exhibit both discrete state and continuous state dynamics are called hybrid systems. In most nontrivial cases, these two aspects of system behavior interact to such a significant extent that they cannot be ...

Lee, Cha Kun

2006-01-01T23:59:59.000Z

39

Vehicle Technologies Office: Hybrid and Vehicle Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Hybrid and Vehicle Hybrid and Vehicle Systems to someone by E-mail Share Vehicle Technologies Office: Hybrid and Vehicle Systems on Facebook Tweet about Vehicle Technologies Office: Hybrid and Vehicle Systems on Twitter Bookmark Vehicle Technologies Office: Hybrid and Vehicle Systems on Google Bookmark Vehicle Technologies Office: Hybrid and Vehicle Systems on Delicious Rank Vehicle Technologies Office: Hybrid and Vehicle Systems on Digg Find More places to share Vehicle Technologies Office: Hybrid and Vehicle Systems on AddThis.com... Just the Basics Hybrid & Vehicle Systems Modeling & Simulation Integration & Validation Benchmarking Parasitic Loss Reduction Propulsion Systems Advanced Vehicle Evaluations Energy Storage Advanced Power Electronics & Electrical Machines

40

Vehicle Technologies Office: Hybrid and Vehicle Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Hybrid and Vehicle Systems Hybrid and vehicle systems research provides an overarching vehicle systems perspective to the technology research and development (R&D) activities of...

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Wind/hybrid power system test facilities in the United States and Canada  

SciTech Connect

By 1995, there will be four facilities available for testing of wind/hybrid power systems in the United States and Canada. This paper describes the mission, approach, capabilities, and status of activity at each of these facilities. These facilities have in common a focus on power systems for remote, off-grid locations that include wind energy. At the same time, these facilities have diverse, yet complimentary, missions that range from research to technology development to testing. The first facility is the test facility at the Institut de Recherche d`Hydro-Quebec (IREQ), Hydro-Quebec`s research institute near Montreal, Canada. This facility, not currently in operation, was used for initial experiments demonstrating the dynamic stability of a high penetration, no-storage wind/diesel (HPNSWD) concept. The second facility is located at the Atlantic Wind Test Site (AWTS) on Prince Edward Island, Canada, where testing of the HPNSWD concept developed by Hydro-Quebec is currently underway. The third is the Hybrid Power Test Facility planned for the National Wind Technology Center at the National Renewable Energy Laboratory (NREL) in Golden, Colorado, which will focus on testing commercially available hybrid power systems. The fourth is the US Department of Agriculture (USDA) Conservation and Production Research Laboratory in Bushland, Texas, where a test laboratory is being developed to study wind-energy penetration and control strategies for wind/hybrid systems. The authors recognize that this summary of test facilities is not all inclusive; for example, at least one US industrial facility is currently testing a hybrid power system. Our intent, though, is to describe four facilities owned by nonprofit or governmental institutions in North America that are or will be available for ongoing development of wind/hybrid power systems.

Green, H J [National Renewable Energy Lab., Golden, CO (United States); Clark, R N [USDA Conservation and Production Research Laboratory, Bushland, TX (United States); Brothers, C [Atlantic Wind Test Site, North Cape, PE (Canada); Saulnier, B [Institut de Recherche d`Hydro-Quebec, Varennes, PQ (Canada)

1994-05-01T23:59:59.000Z

42

Hybrid solar lighting distribution systems and components  

Science Conference Proceedings (OSTI)

A hybrid solar lighting distribution system and components having at least one hybrid solar concentrator, at least one fiber receiver, at least one hybrid luminaire, and a light distribution system operably connected to each hybrid solar concentrator and each hybrid luminaire. A controller operates all components.

Muhs, Jeffrey D. (Lenoir City, TN); Earl, Dennis D. (Knoxville, TN); Beshears, David L. (Knoxville, TN); Maxey, Lonnie C. (Powell, TN); Jordan, John K. (Oak Ridge, TN); Lind, Randall F. (Lenoir City, TN)

2011-07-05T23:59:59.000Z

43

Hybrid solar lighting systems and components  

DOE Patents (OSTI)

A hybrid solar lighting system and components having at least one hybrid solar concentrator, at least one fiber receiver, at least one hybrid luminaire, and a light distribution system operably connected to each hybrid solar concentrator and each hybrid luminaire. A controller operates each component.

Muhs, Jeffrey D. (Lenoir City, TN); Earl, Dennis D. (Knoxville, TN); Beshears, David L. (Knoxville, TN); Maxey, Lonnie C. (Powell, TN); Jordan, John K. (Oak Ridge, TN); Lind, Randall F. (Lenoir City, TN)

2007-06-12T23:59:59.000Z

44

Efficient simulation of hybrid systems: A hybrid bond graph approach  

Science Conference Proceedings (OSTI)

Accurate and efficient simulations facilitate cost-effective design and analysis of large, complex, embedded systems, whose behaviors are typically hybrid, i.e. continuous behaviors interspersed with discrete mode changes. In this paper we present an ... Keywords: component-oriented modeling, dynamic causal assignment, hybrid bond graphs, modeling and simulation environments, simulation of hybrid systems

Indranil Roychoudhury; Matthew J Daigle; Gautam Biswas; Xenofon Koutsoukos

2011-06-01T23:59:59.000Z

45

Requirements Specifications For Hybrid Systems  

E-Print Network (OSTI)

this paper is to present a formal framework for representing and reasoning about the requirements of hybrid systems. As background, the paper briefly reviews an abstract model for specifying system and software requirements, called the Four Variable Model [12], and a related requirements method, called SCR (Software Cost Reduction) [10, 1]. The paper then introduces a special discrete version of the Four Variable Model, the SCR requirements model [8] and proposes an extension of the SCR model for specifying and reasoning about hybrid systems. 2 Background

Constance Heitmeyer

1996-01-01T23:59:59.000Z

46

Design and Performance of the Van Geet Off-Grid Home: Preprint  

DOE Green Energy (OSTI)

The Van Geet home near Denver, Colorado, demonstrates the successful integration of energy conservation measures and renewable energy supply in a beautiful, comfortable, energy-efficient, 295-m2 (3,176-ft2) off-grid home in a cold, sunny climate. Features include a tight envelope, energy-efficient appliances, passive solar heating (direct gain and Trombe wall), natural cooling, solar hot water, and photovoltaics. In addition to describing this house and its performance, this paper describes the recommended design process of (1) setting a goal for energy efficiency at the outset, (2) applying rules of thumb, and (3) using computer simulation to fine-tune the design. Performance monitoring and computer simulation are combined for the best possible analysis of energy performance. In this case, energy savings are estimated as 89% heating and cooling, 83% electrical, and nearly 100% domestic water heating. The heating and cooling energy use is 8.96 kJ/Cdaym2 (0.44 Btu/Fdayft2).

Barley, C. D.; Torcellini, P.; Van Geet, O.

2003-01-01T23:59:59.000Z

47

Hybrid2: The hybrid power system simulation model  

DOE Green Energy (OSTI)

There is a large-scale need and desire for energy in remote communities, especially in the developing world; however the lack of a user friendly, flexible performance prediction model for hybrid power systems incorporating renewables hindered the analysis of hybrids (including wind turbines, PV, diesel generators, AC/DC energy storage) as options to conventional solutions. A user friendly model was needed with the versatility to simulate the many system locations, widely varying hardware configurations, and differing control options for potential hybrid power systems. To meet these ends, NREL and U. Mass. researchers developed the Hybrid2 software. This paper provides an overview of the capabilities, features, and functionality of the Hybrid2 code, discusses its validation and future plans. Model availability and technical support provided to Hybrid2 users are also discussed.

Baring-Gould, E I; Green, H J; van Dijk, V A.P. [National Renewable Energy Lab., Golden, CO (United States); Manwell, J F [Massachusetts Univ., Amherst, MA (United States). Renewable Energy Research Lab.

1996-07-01T23:59:59.000Z

48

Hybrid powertrain system  

DOE Patents (OSTI)

A powertrain system is provided that includes a first prime mover and change-gear transmission having a first input shaft and a second input shaft. A twin clutch is disposed between the first prime mover and the transmission. The twin clutch includes a first main clutch positioned between the first prime mover and the first input shaft and a second main clutch positioned between the first prime mover and the second input shaft. The powertrain system also includes a second prime mover operably connected to one of the first and second input shafts.

Hughes, Douglas A. (Wixom, MI)

2007-09-25T23:59:59.000Z

49

Solid-State Lighting on a Shoestring Budget: The Economics of Off-Grid Lighting for Small Businesses in Kenya  

Science Conference Proceedings (OSTI)

superior lighting services to low income people in off-grid areas of developing countries, many of whom currently rely on fuel based lighting sources such as kerosene. If this potential is to be achieved in the near term, however, manufacturers must produce off-grid lighting products that are inexpensive, perform well, and meet the needs of potential end users. At present, relatively few products meet all three of these goals. In this article, we report results from a detailed study of lighting use by micro-enterprises in two small towns in Kenya's Rift Valley Province. The work included a survey about lighting use by 50 small businesses, careful measurements of kerosene lighting use patterns and associated costs for 23 of these businesses, and a subsequent field trial in which 14 of the 23 businesses purchased and used low cost LED lamps over a number of months.

Radecsky, Kristen; Johnstone, Peter; Jacobson, Arne; Mills, Evan

2008-12-14T23:59:59.000Z

50

Testing of a 50-kW Wind-Diesel Hybrid System at the National Wind Technology Center  

DOE Green Energy (OSTI)

In remote off-grid villages and communities, a reliable power source is important in improving the local quality of life. Villages often use a diesel generator for their power, but fuel can be expensive and maintenance burdensome. Including a wind turbine in a diesel system can reduce fuel consumption and lower maintenance, thereby reducing energy costs. However, integrating the various components of a wind-diesel system, including wind turbine, power conversion system, and battery storage (if applicable), is a challenging task. To further the development of commercial hybrid power systems, the National Renewable Energy Laboratory (NREL), in collaboration with the New World Village Power Corporation (NWVP), tested a NWVP 50-kW wind-diesel hybrid system connected to a 15/50 Atlantic Orient Corporation (AOC) wind turbine. Testing was conducted from October 1995 through March 1996 at the National Wind Technology Center (NWTC). A main objective of the testing was to better understand the application of wind turbines to weak grids typical of small villages. Performance results contained in this report include component characterization, such as power conversion losses for the rotary converter system and battery round trip efficiencies. In addition, system operation over the test period is discussed with special attention given to dynamic issues. Finally, future plans for continued testing and research are discussed.

Corbus, D. A.; Green, H. J.; Allderdice, A.; Rand, K.; Bianchi, J.; Linton, E.

1996-07-01T23:59:59.000Z

51

A verification framework for hybrid systems  

E-Print Network (OSTI)

Combining; discrete state transitions with differential equations, Hybrid system models provide an expressive formalism for describing software systems that interact with a physical environment. Automatically checking ...

Mitra, Sayan

2007-01-01T23:59:59.000Z

52

Application of crossflow turbine in off-grid pico hydro renewable energy system  

Science Conference Proceedings (OSTI)

This paper reviews small-scale hydro turbines and their applications at power production environment while focusing on the application of cross-flow turbine in pico hydro set-up, a run-of-river scheme which does not require dam or reservoir for water ... Keywords: cross-flow turbine, pico hydro, renewable energy, run-of-river, small-scale hydro

J. A. Razak; Y. Ali; M. A. Alghoul; Mohammad Said Zainol; Azami Zaharim; K. Sopian

2010-01-01T23:59:59.000Z

53

A universal planning system for hybrid domains  

Science Conference Proceedings (OSTI)

Many real world problems involve hybrid systems, subject to (continuous) physical effects and controlled by (discrete) digital equipments. Indeed, many efforts are being made to extend the current planning systems and modelling languages to support such ... Keywords: Hybrid systems, PDDL+, Universal planning

Giuseppe Della Penna; Daniele Magazzeni; Fabio Mercorio

2012-06-01T23:59:59.000Z

54

Study of Hybrid Geothermal Heat Pump Systems  

Science Conference Proceedings (OSTI)

Hybrid Ground Source Heat Pump systems often combine a traditional geothermal system with either a cooling tower or fluid cooler for heat rejection and a boiler or solar heat collector for heat addition to the loop. These systems offer the same energy efficiency benefits as full geothermal systems to utilities and their customers but at a potentially lower first cost. Many hybrid systems have materialized to resolve heat buildup in full geothermal system loops where loop temperatures continue to rise as ...

2010-12-06T23:59:59.000Z

55

Illuminating the Pecking Order in Off-Grid Lighting: A Demonstration of LED Lighting for Saving Energy in the Poultry Sector  

Science Conference Proceedings (OSTI)

The Lumina Project and Lighting Africa conducted a full-scale field test involving a switch from kerosene to solar-LED lighting for commercial broiler chicken production at an off-grid farm in Kenya. The test achieved lower operating costs, produced substantially more light, improved the working environment, and had no adverse effect on yields. A strategy using conventional solar-fluorescent lighting also achieved comparable yields, but entailed a six-fold higher capital cost and significantly higher recurring battery replacement costs. Thanks to higher energy and optical efficiencies, the LED system provided approximately twice the illumination to the chicken-production area and yet drew less than half the power.At the study farm, 3000 chickens were grown in each of three identical houses under kerosene, fluorescent, and LED lighting configurations. Under baseline conditions, a yearly expenditure of 1,200 USD is required to illuminate the three houses with kerosene. The LED system eliminates this fuel use and expense with a corresponding simple payback time of 1.5 years, while the solar-fluorescent system has a payback time of 9.3 years. The corresponding reduction in fuel expenditure in both cases represents a 15percent increase in after-tax net income (revenues minus expenses) across the entire business operation. The differential cost-effectiveness between the LED and fluorescent systems would be substantially greater if the fluorescent system were upsized to provide the same light as the LED system. Providing light with the fluorescent or LED systems is also far more economical than connecting to the grid in this case. The estimated grid-connection cost at this facility is 1.7 million Kenya Schillings (approximately 21,250 USD), which is nearly six-times the cost of the fluorescent system and 35-times the cost of the LED system.The LED system also confers various non-energy benefits. The relative uniformity of LED lighting, compared to the fluorescent or kerosene lighting, reduced crowding which in turn created a less stressful environment for the chickens. The far higher levels of illumination also created a better environment for the workers, while eliminating the time required for obtaining fuel and maintaining kerosene lanterns. An additional advantage of the LED system relative to the solar fluorescent system was that the former does not require a skilled technician to carry out the installation. The portable LED system lighting layout is also more easily adjusted than that of the hardwired fluorescent systems. Furthermore, switching to the LED system avoids over one metric ton of carbon dioxide emissions per house on an annual basis compared to kerosene. There is high potential for replication of this particular LED lighting strategy in the developing world. In order to estimate the scale of kerosene use and the potential for savings, more information is needed on the numbers of chickens produced off-grid, as well as lighting uses for other categories of poultry production (egg layers, indigenous broilers ). Our discovery that weight gain did not slow in the solar-fluorescent house after it experienced extended lighting outages beginning on day 14 of the 35-day study suggests that conventional farming practices in Kenyan broiler operations may call for more hours of lighting than is needed to achieve least-cost production.

Tracy, Jennifer; Mills, Evan

2010-11-06T23:59:59.000Z

56

Performance analysis of hybrid liquid desiccant solar cooling system.  

E-Print Network (OSTI)

??This thesis investigates the coefficient of performance (COP) of a hybrid liquid desiccant solar cooling system. This hybrid cooling system includes three sections: 1) conventional (more)

Zhou, Zhipeng (Joe Zoe)

2009-01-01T23:59:59.000Z

57

Powertrain system for a hybrid electric vehicle  

DOE Patents (OSTI)

A hybrid electric powertrain system is provided including an electric motor/generator drivingly engaged with the drive shaft of a transmission. The electric is utilized for synchronizing the rotation of the drive shaft with the driven shaft during gear shift operations. In addition, a mild hybrid concept is provided which utilizes a smaller electric motor than typical hybrid powertrain systems. Because the electric motor is drivingly engaged with the drive shaft of the transmission, the electric motor/generator is driven at high speed even when the vehicle speed is low so that the electric motor/generator provides more efficient regeneration. 34 figs.

Reed, R.G. Jr.; Boberg, E.S.; Lawrie, R.E.; Castaing, F.J.

1999-08-31T23:59:59.000Z

58

Powertrain system for a hybrid electric vehicle  

DOE Patents (OSTI)

A hybrid electric powertrain system is provided including an electric motor/generator drivingly engaged with the drive shaft of a transmission. The electric is utilized for synchronizing the rotation of the drive shaft with the driven shaft during gear shift operations. In addition, a mild hybrid concept is provided which utilizes a smaller electric motor than typical hybrid powertrain systems. Because the electric motor is drivingly engaged with the drive shaft of the transmission, the electric motor/generator is driven at high speed even when the vehicle speed is low so that the electric motor/generator provides more efficient regeneration.

Reed, Jr., Richard G. (Royal Oak, MI); Boberg, Evan S. (Hazel Park, MI); Lawrie, Robert E. (Whitmore Lake, MI); Castaing, Francois J. (Bloomfield Township, MI)

1999-08-31T23:59:59.000Z

59

Analysis of Hybrid Hydrogen Systems: Final Report  

DOE Green Energy (OSTI)

Report on biomass pathways for hydrogen production and how they can be hybridized to support renewable electricity generation. Two hybrid systems were studied in detail for process feasibility and economic performance. The best-performing system was estimated to produce hydrogen at costs ($1.67/kg) within Department of Energy targets ($2.10/kg) for central biomass-derived hydrogen production while also providing value-added energy services to the electric grid.

Dean, J.; Braun, R.; Munoz, D.; Penev, M.; Kinchin, C.

2010-01-01T23:59:59.000Z

60

Hybrid electrical energy storage systems  

Science Conference Proceedings (OSTI)

Electrical energy is a high quality form of energy that can be easily converted to other forms of energy with high efficiency and, even more importantly, it can be used to control lower grades of energy quality with ease. However, building a cost-effective ... Keywords: charge, electrical storage, energy, energy storage, hybrid storage, management

Massoud Pedram; Naehyuck Chang; Younghyun Kim; Yanzhi Wang

2010-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Manzanita Hybrid Power system Project Final Report  

DOE Green Energy (OSTI)

The Manzanita Indian Reservation is located in southeastern San Diego County, California. The Tribe has long recognized that the Reservation has an abundant wind resource that could be commercially utilized to its benefit, and in 1995 the Tribe established the Manzanita Renewable Energy Office. Through the U.S. Department of Energy's Tribal Energy Program the Band received funds to install a hybrid renewable power system to provide electricity to one of the tribal community buildings, the Manzanita Activities Center (MAC building). The project began September 30, 1999 and was completed March 31, 2005. The system was designed and the equipment supplied by Northern Power Systems, Inc, an engineering company with expertise in renewable hybrid system design and development. Personnel of the National Renewable Energy Laboratory provided technical assistance in system design, and continued to provide technical assistance in system monitoring. The grid-connected renewable hybrid wind/photovoltaic system provides a demonstration of a solar/wind energy hybrid power-generating project on Manzanita Tribal land. During the system design phase, the National Renewable Energy Lab estimated that the wind turbine is expected to produce 10,000-kilowatt hours per year and the solar array 2,000-kilowatt hours per year. The hybrid system was designed to provide approximately 80 percent of the electricity used annually in the MAC building. The project proposed to demonstrate that this kind of a system design would provide highly reliable renewable power for community uses.

Trisha Frank

2005-03-31T23:59:59.000Z

62

Hydraulic Hybrid Systems | Open Energy Information  

Open Energy Info (EERE)

Hydraulic Hybrid Systems Hydraulic Hybrid Systems Jump to: navigation, search Logo: Hydraulic Hybrid Systems Name Hydraulic Hybrid Systems Address 320 N. Railroad Ave Place Loveland, Colorado Zip 80537 Sector Vehicles Product hydraulic hybrid system for light-duty vehicles Year founded 2008 Number of employees 11-50 Phone number 303-519-4144 Website http://www.hydraulichybridsyst Coordinates 40.394833°, -105.0758931° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.394833,"lon":-105.0758931,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

63

Analysis of Actual Operating Conditions of an Off-grid Solid Oxide Fuel Cell  

DOE Green Energy (OSTI)

Fuel cells have been proposed as ideal replacements for other technologies in remote locations such as Rural Alaska. A number of suppliers have developed systems that might be applicable in these locations, but there are several requirements that must be met before they can be deployed: they must be able to operate on portable fuels, and be able to operate with little operator assistance for long periods of time. This project was intended to demonstrate the operation of a 5 kW fuel cell on propane at a remote site (defined as one without access to grid power, internet, or cell phone, but on the road system). A fuel cell was purchased by the National Park Service for installation in their newly constructed visitor center at Exit Glacier in the Kenai Fjords National Park. The DOE participation in this project as initially scoped was for independent verification of the operation of this demonstration. This project met with mixed success. The fuel cell has operated over 6 seasons at the facility with varying degrees of success, with one very good run of about 1049 hours late in the summer of 2006, but in general the operation has been below expectations. There have been numerous stack failures, the efficiency of electrical generation has been lower than expected, and the field support effort required has been far higher than expected. Based on the results to date, it appears that this technology has not developed to the point where demonstrations in off road sites are justified.

Dennis Witmer; Thomas Johnson; Jack Schmid

2008-12-31T23:59:59.000Z

64

Predicting time series with advanced hybrid systems  

Science Conference Proceedings (OSTI)

Autogressive moving average (ARMA) has been widely used to model processes that generate linear time-series. Recent research activities in forecasting with artificial neutral networks (ANNs) suggest that ANNs can be a promising alternative to the traditional ... Keywords: ARMA models, fuzzy system, hybrid system, neutral networks, time series

O. Valenzuela; I. Rojas; F. Rojas; H. Pomares; J. Gonzalez; L. J. Herrera; A. Guillen

2005-12-01T23:59:59.000Z

65

Associative computer: a hybrid connectionistic production system  

Science Conference Proceedings (OSTI)

In this paper, we introduce a connectionistic hybrid production system, which relies on the distributed representation and the usage of associative memories. Benefits of the distributed representation include heuristics resulting from pictogram representation. ... Keywords: Connectionism, Distributed representation, Learning, Problem solving, Production system

Andreas Wichert

2005-06-01T23:59:59.000Z

66

Off-grid in a cold city: The Alberta sustainable home  

SciTech Connect

The Alberta Sustainable Home is a new suburban three-bedroom house and office that will soon be independent of the sewer, electric, and water systems. Located in the cold, dry, sunny climate of Calgary, AB, the home is now demonstrating the feasibility of environmentally sustainable, cost-saving devices-from Eco-studs in the framework to graywater heat recovery devices. Although it was built for about the same price as a comparable conventional home, the Alberta Sustainable Home has received a preferential mortgage rate, is expected to have an unusually high resale value, and will cost about $1,500 per year (Canadian) less for utilities. The Alberta Sustainable Home was built privately by Autonomous and Sustainable Housing Incorporated (ASH), in partnership with some 215 companies worldwide. Construction began in September 1993, and the designers and builders have lived and worked in the building since April 1994. Topics include the following: space and water heating; airtight construction; insulation; windows; refrigeration; saving water; low embodied energy; retrofitting; pollutant control; less power.

Rieger, T.; Byrne, J. [eds.

1996-03-01T23:59:59.000Z

67

Case study of offshore wind farm integration to offshore oil and gas platforms as an isolated system - System Topologies, Steady State and Dynamic Aspects.  

E-Print Network (OSTI)

?? The objective of this thesis work has been to investigate the electric system stability, reliability and power security of an ?off-grid? isolated network system (more)

Hadiya, Maheshkumar

2011-01-01T23:59:59.000Z

68

Assessing the Performance of LED-Based Flashlights Available in the Kenyan Off-Grid Lighting Market  

SciTech Connect

Low cost rechargeable flashlights that use LED technology are increasingly available in African markets. While LED technology holds promise to provide affordable, high quality lighting services, the widespread dissemination of low quality products may make it difficult to realize this potential. This study includes performance results for three brands of commonly available LED flashlights that were purchased in Kenya in 2009. The performance of the flashlights was evaluated by testing five units for each of the three brands. The tests included measurements of battery capacity, time required to charge the battery, maximum illuminance at one meter, operation time and lux-hours from a fully charged battery, light distribution, and color rendering. All flashlights tested performed well below the manufacturers? rated specifications; the measured battery capacity was 30-50percent lower than the rated capacity and the time required to fully charge the battery was 6-25percent greater than the rated time requirement. Our analysis further shows that within each brand there is considerable variability in each performance indicator. The five samples within a single brand varied from each other by as much as 22percent for battery capacity measurements, 3.6percent for the number of hours required for a full charge, 23percent for maximum initial lux, 38percent for run time, 11percent for light distribution and by as much as 200percent for color rendering. Results obtained are useful for creating a framework for quality assurance of off-grid LED products and will be valuable for informing consumers, distributors and product manufacturers about product performance.

Tracy, Jennifer; Jacobson, Arne; Mills, Evan

2010-03-02T23:59:59.000Z

69

Electron-State Hybridization in Heavy-Fermion Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Electron-State Hybridization in Heavy-Fermion Systems Electron-State Hybridization in Heavy-Fermion Systems Print Wednesday, 27 September 2006 00:00 Heavy-fermion systems are...

70

Analysis of hybrid solar systems  

DOE Green Energy (OSTI)

This study uses the TRNSYS simulation program to evaluate the performance of active charge/passive discharge solar systems with water as the working fluid. This design was introduced in the Village Homes development in Davis, Calif., and is currently being used by Trident Energy Systems in Davis. TRNSYS simulations are used to evaluate the heating performance and cooling augmentation provided by systems in several climates. The results of the simulations are used to develop a simplified analysis tool similar to the F-chart and Phi-bar procedures used for active systems. This tool, currently in a preliminary stage, should provide the designer with quantitative performance estimates for comparison with other passive, active, and nonsolar heating and cooling designs.

Swisher, J.

1980-10-01T23:59:59.000Z

71

Hybrid photovoltaic/thermal solar energy system  

DOE Green Energy (OSTI)

Heating and cooling systems that use hybrid solar energy collectors (combination photovoltaic-thermal) have the potential for considerable energy savings, particularly when the system includes a heat pump. Economic evaluations show that photovoltaic systems are potentially most economical, but results depend critically on future collector costs as well as energy prices. Results are based on a specially developed computer program that predicted the total auxiliary energy required for five different solar heating/cooling systems. Performance calculations for a modeled residence and small office building were made using meteorological data from four geographic locations. Annual system costs were also calculated.

Kern, E.C. Jr.; Russell, M.C.

1978-03-27T23:59:59.000Z

72

A fuel-cell-battery hybrid for portable embedded systems  

Science Conference Proceedings (OSTI)

This article presents our work on the development of a fuel cell (FC) and battery hybrid (FC-Bh) system for use in portable microelectronic systems. We describe the design and control of the hybrid system, as well as a dynamic power management (DPM)-based ... Keywords: DPM, Simulation, battery, fuel cell, hybrid systems, simulator

Kyungsoo Lee; Naehyuck Chang; Jianli Zhuo; Chaitali Chakrabarti; Sudheendra Kadri; Sarma Vrudhula

2008-01-01T23:59:59.000Z

73

Analysis of village hybrid systems in Chile  

DOE Green Energy (OSTI)

Chile recently began a major rural electrification program to electrify those 240,000 families (about half of the rural people) who lack electricity access. In this paper, we discuss a pilot project to electrify three remote villages in Chile`s Region IX using wind/genset/battery hybrids. The intent of this project is to demonstrate the reliability and cost-effectiveness of wind/genset/battery hybrids and to encourage replication of these types of systems in Chile`s electrification program. For each village, electricity connections are planned for several residences, and also schools, health posts, community centers, or chapels. Projected average daily loads are small, ranging from 4 to 10 kWh. Using the optimization program HOMER and the simulation program Hybrid2, we evaluated options to maximize technical performance, minimize costs, and gain experience with a variety of systems and components. We find that wind/genset/battery hybrids will be able to provide cost-effective, reliable power for these sites. More importantly, their inherent flexibility allows for variations in load and resource without greatly affecting the cost of energy.

Lew, D J; Corbus, D; Holz, R [and others

1996-06-01T23:59:59.000Z

74

Hybrid Wind and Solar Electric Systems | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

-- not connected to an electricity distribution system. For the times when neither the wind nor the solar system are producing, most hybrid systems provide power through...

75

Hybrid Wind and Solar Electric Systems | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Hybrid Wind and Solar Electric Systems Hybrid Wind and Solar Electric Systems Hybrid Wind and Solar Electric Systems July 2, 2012 - 8:21pm Addthis Because the peak operating times for wind and solar systems occur at different times of the day and year, hybrid systems are more likely to produce power when you need it. Because the peak operating times for wind and solar systems occur at different times of the day and year, hybrid systems are more likely to produce power when you need it. How does it work? A small "hybrid" electric system that combines wind and solar technologies can offer several advantages over either single system. According to many renewable energy experts, a small "hybrid" electric system that combines home wind electric and home solar electric (photovoltaic or PV) technologies offers several advantages over either

76

Design of isolated renewable hybrid power systems  

Science Conference Proceedings (OSTI)

Isolated electrical power generating units can be used as an economically viable alternative to electrify remote villages where grid extension is not feasible. One of the options for building isolated power systems is by hybridizing renewable power sources like wind, solar, micro-hydro, etc. along with appropriate energy storage. A method to optimally size and to evaluate the cost of energy produced by a renewable hybrid system is proposed in this paper. The proposed method, which is based on the design space approach, can be used to determine the conditions for which hybridization of the system is cost effective. The simple and novel methodology, proposed in this paper, is based on the principles of process integration. It finds the minimum battery capacity when the availability and ratings of various renewable resources as well as load demand are known. The battery sizing methodology is used to determine the sizing curve and thereby the feasible design space for the entire system. Chance constrained programming approach is used to account for the stochastic nature of the renewable energy resources and to arrive at the design space. The optimal system configuration in the entire design space is selected based on the lowest cost of energy, subject to a specified reliability criterion. The effects of variation of the specified system reliability and the coefficient of correlation between renewable sources on the design space, as well as the optimum configuration are also studied in this paper. The proposed method is demonstrated by designing an isolated power system for an Indian village utilizing wind-solar photovoltaic-battery system. (author)

Sreeraj, E.S.; Chatterjee, Kishore [Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai 400 076 (India); Bandyopadhyay, Santanu [Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai 400 076 (India)

2010-07-15T23:59:59.000Z

77

Hybrid2: The hybrid system simulation model, Version 1.0, user manual  

DOE Green Energy (OSTI)

In light of the large scale desire for energy in remote communities, especially in the developing world, the need for a detailed long term performance prediction model for hybrid power systems was seen. To meet these ends, engineers from the National Renewable Energy Laboratory (NREL) and the University of Massachusetts (UMass) have spent the last three years developing the Hybrid2 software. The Hybrid2 code provides a means to conduct long term, detailed simulations of the performance of a large array of hybrid power systems. This work acts as an introduction and users manual to the Hybrid2 software. The manual describes the Hybrid2 code, what is included with the software and instructs the user on the structure of the code. The manual also describes some of the major features of the Hybrid2 code as well as how to create projects and run hybrid system simulations. The Hybrid2 code test program is also discussed. Although every attempt has been made to make the Hybrid2 code easy to understand and use, this manual will allow many organizations to consider the long term advantages of using hybrid power systems instead of conventional petroleum based systems for remote power generation.

Baring-Gould, E.I.

1996-06-01T23:59:59.000Z

78

Hybrid Power System Simulation Model | Open Energy Information  

Open Energy Info (EERE)

Hybrid Power System Simulation Model Hybrid Power System Simulation Model Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Hybrid Power System Simulation Model Focus Area: Renewable Energy Topics: System & Application Design Website: www.umass.edu/windenergy/OLD_SITE/projects/hybrid2/ Equivalent URI: cleanenergysolutions.org/content/hybrid-power-system-simulation-model, Language: English Policies: Deployment Programs DeploymentPrograms: Technical Assistance This tool performs detailed long-term performance and economic analysis on a wide variety of hybrid power systems. It is a probabilistic/time-series computer model, using time-series data for loads, wind speed, solar insolation, temperature, and the power system designed or selected by the user, to predict the performance of the hybrid power system. An economic

79

Design and Optimization of Future Hybrid and Electric Propulsion Systems  

E-Print Network (OSTI)

Design and Optimization of Future Hybrid and Electric Propulsion Systems: An Advanced Tool and Optimization of Future Hybrid and Electric Propulsion Systems: An Advanced Tool Integrated in a Complete Hybrid Electric Vehicle ICE Internal Combustion Engine IM Induction Machine IPM Internal Permanent Magnet

Paris-Sud XI, Université de

80

Benefits of battery-uItracapacitor hybrid energy storage systems  

E-Print Network (OSTI)

This thesis explores the benefits of battery and battery-ultracapacitor hybrid energy storage systems (ESSs) in pulsed-load applications. It investigates and quantifies the benefits of the hybrid ESS over its battery-only ...

Smith, Ian C., S.M. (Ian Charles). Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Electron-State Hybridization in Heavy-Fermion Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Electron-State Hybridization in Heavy-Fermion Systems Print Heavy-fermion systems are characterized by electrons with extremely large effective masses. The corresponding...

82

Object-Oriented Modeling Of Hybrid Systems  

E-Print Network (OSTI)

A new methodology for the object--oriented description of models consisting of a mixture of continuous and discrete components is presented. The object--oriented paradigm enables the user to describe such models in a modular fashion that permits the reuse of these models independently of the environment in which they are to be embedded. The paper explains the basic mechanisms needed for object--oriented modeling of hybrid systems by means of language constructs available in the object--oriented modeling language Dymola. It then addresses more advanced concepts such as variable structure models containing e.g. ideal electrical switches, ideal diodes and dry friction.

Hilding Elmqvist; Francois E. Cellier; Martin Otter

1993-01-01T23:59:59.000Z

83

Hybrid distributed generation for power distribution systems planning  

Science Conference Proceedings (OSTI)

This paper presents planning models for hybrid distributed generation systems, as well as the results corresponding to a distribution systems planning problem obtained using a new computational tool based on a Geographic Information System, GIS. This ... Keywords: distributed generation (DG), geographical information systems (GIS), hybrid power systems, optimal planning

I. J. Ramrez-Rosado; P. J. Zorzano-Santamara; L. A. Fernndez-Jimnez; E. Garca-Garrido; P. Lara-Santilln; E. Zorzano-Alba; M. Mendoza-Villena

2006-02-01T23:59:59.000Z

84

Hybrid systems modeling and verification with DEVS (WIP)  

Science Conference Proceedings (OSTI)

Hybrid systems (where continuous and discrete phenomena interact) are found in many natural and artificial systems. An important example, real-time embedded systems usually include discrete-event controllers interacting with a continuous plant. Verifying ... Keywords: DEVS, hybrid systems verification, quantized state systems QSS, timed automata

Hesham Saadawi, Gabriel Wainer

2013-04-01T23:59:59.000Z

85

NREL: Fleet Test and Evaluation - Hybrid Electric Drive Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Hybrid Electric Drive Systems Hybrid Electric Drive Systems The Fleet Test and Evaluation Team conducts performance evaluations of hybrid electric drive systems in fleets of delivery vehicles and transit buses. Hybrid electric drive systems combine a primary power source, an energy storage system, and an electric motor to achieve a combination of emissions, fuel economy, and range benefits unattainable with any of these technologies alone. Hybrid electric drive systems use less petroleum-based fuel and capture energy created during breaking and idling. This collected energy is used to propel the vehicle during normal drive cycles. The batteries supply additional power for acceleration and hill climbing. Learn more about the team's hybrid electric drive system evaluations: Delivery Vehicles

86

Total Thermal Management System for Hybrid and Full Electric Vehicles  

Total Thermal Management System for Hybrid and Full Electric Vehicles Note: The technology described above is an early stage opportunity. Licensing rights to this ...

87

Powertrain system for a hybrid electric vehicle - Energy ...  

A hybrid electric powertrain system is provided including an electric motor/generator drivingly engaged with the drive shaft of a transmission. The electric is ...

88

Assessment of Hybrid Geothermal Heat Pump Systems - Technology...  

NLE Websites -- All DOE Office Websites (Extended Search)

cool- ing needs of the building and offers general guidelines Assessment of Hybrid Geothermal Heat Pump Systems Geothermal heat pumps offer attractive choice for space...

89

Energy storage for hybrid remote power systems  

DOE Green Energy (OSTI)

Energy storage can be a cost-effective component of hybrid remote power systems. Storage serves the special role of taking advantage of intermittent renewable power sources. Traditionally this role has been played by lead-acid batteries, which have high life-cycle costs and pose special disposal problems. Hydrogen or zinc-air storage technologies can reduce life-cycle costs and environmental impacts. Using projected data for advanced energy storage technologies, LLNL ran an optimization for a hypothetical Arctic community with a reasonable wind resource (average wind speed 8 m/s). These simulations showed the life-cycle annualized cost of the total energy system (electric plus space heating) might be reduced by nearly 40% simply by adding wind power to the diesel system. An additional 20 to 40% of the wind-diesel cost might be saved by adding hydrogen storage or zinc-air fuel cells to the system. Hydrogen produced by electrolysis of water using intermittent, renewable power provides inexpensive long-term energy storage. Conversion back to electricity with fuel cells can be accomplished with available technology. The advantages of a hydrogen electrolysis/fuel cell system include low life-cycle costs for long term storage, no emissions of concern, quiet operation, high reliability with low maintenance, and flexibility to use hydrogen as a direct fuel (heating, transportation). Disadvantages include high capital costs, relatively low electrical turn-around efficiency, and lack of operating experience in utility settings. Zinc-air fuel cells can lower capital and life-cycle costs compared to hydrogen, with most of the same advantages. Like hydrogen systems, zinc-air technology promises a closed system for long-term storage of energy from intermittent sources. The turn around efficiency is expected to exceed 60%, while use of waste heat can potentially increase overall energy efficiency to over 80%.

Isherwood, W., LLNL

1998-03-01T23:59:59.000Z

90

Charge allocation for hybrid electrical energy storage systems  

Science Conference Proceedings (OSTI)

Hybrid electrical energy storage (HEES) systems, composed of multiple banks of heterogeneous electrical energy storage (EES) elements with their unique strengths and weaknesses, have been introduced to efficiently store and retrieve electrical energy ... Keywords: charge allocation, charge management, hybrid electrical energy storage system

Qing Xie; Yanzhi Wang; Younghyun Kim; Naehyuck Chang; Massoud Pedram

2011-10-01T23:59:59.000Z

91

Detection system based on a novel large area hybrid detector  

Science Conference Proceedings (OSTI)

A system level implementation of a large area hybrid detector is presented. The detector used in this system consists of an array of hydrogenated amorphous silicon photodiodes directly connected to a CMOS readout chip, which is vertically integrated ... Keywords: Amorphous silicon, Hybrid detectors, Large area photodetectors

A. Nascetti; P. Valerio; D. Caputo; G. de Cesare

2010-11-01T23:59:59.000Z

92

Towards dense linear algebra for hybrid GPU accelerated manycore systems  

Science Conference Proceedings (OSTI)

We highlight the trends leading to the increased appeal of using hybrid multicore+GPU systems for high performance computing. We present a set of techniques that can be used to develop efficient dense linear algebra algorithms for these systems. We illustrate ... Keywords: Dense linear algebra, Graphics processing units, Hybrid computing, Multicore processors, Parallel algorithms

Stanimire Tomov; Jack Dongarra; Marc Baboulin

2010-06-01T23:59:59.000Z

93

NREL: Fleet Test and Evaluation - Hydraulic Hybrid Drive Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydraulic Hybrid Drive Systems Hydraulic Hybrid Drive Systems NREL's Fleet Test and Evaluation Team conducts performance evaluations of hydraulic hybrid drive systems in delivery vehicles. Because hydraulic hybrids feature highly efficient regenerative braking systems and "engine off at idle" capabilities, they are ideal for parcel delivery applications where stop-and-go traffic is common. Hydraulic hybrid systems can capture up to 70% of the kinetic energy that would otherwise be lost during braking. This energy drives a pump, which transfers hydraulic fluid from a low-pressure reservoir to a high-pressure accumulator. When the vehicle accelerates, fluid in the high-pressure accumulator moves to the lower-pressure reservoir, which drives a motor and provides extra torque. This process can improve the vehicle's fuel economy

94

HYBRID2 -- A versatile model of the performance of hybrid power systems  

DOE Green Energy (OSTI)

In 1993, the National Renewable Laboratory (NREL) made an assessment of the available tools from the United States and Europe for predicting the long-term performance of hybrid power systems. By hybrid power the authors mean combinations of two or more power sources wind turbines, photovoltaics (PV), diesel gensets, or other generators into integrated systems for electric power generation in remote locations. Their conclusion was that there was no single, user-friendly tool capable of modeling the full range of hybrid power technologies being considered for the 1990s and beyond. The existing tools were, in particular, lacking flexibility in system configuration and in dispatch of components. As a result, NREL developed a specification for a model, called HYBRID2, for making comparisons of competing technology options on a level playing field. This specification was prepared with a range of potential users in mind including not only the US Department of Energy (DOE) renewable energy programs, but also the US wind industry, technical consultants, international development institutions/banks, and rural electrification programs in developing countries. During 1994, NREL and subcontractor, the University of Massachusetts (UMass), began development of HYBRID2 with funding from the DOE Wind Energy Program. It builds on the wind/diesel model, HYBRID1, developed previously by UMass, and expands that model to accommodate the wider array of technologies used in hybrid power systems. This paper will provide an overview of the model`s features, functions, and status.

Green, H.J. [National Renewable Energy Lab., Golden, CO (United States); Manwell, J. [Univ. of Massachusetts, Amherst, MA (United States)

1995-04-01T23:59:59.000Z

95

Assessment of solar-geothermal hybrid system concepts  

SciTech Connect

Studies were conducted to assess the technical and economic merits and limitations of advanced solar-geothermal hybrid electric power plant concepts. Geothermal resource characteristics and technologies were reviewed to determine the best possible ways of combining solar and geothermal technologies into a hybrid operation. Potential hybrid system concepts are defined and their performance, resource usage, and economics are assessed relative to the individual solar and geothermal resource development techniques. Key results are presented.

Mathur, P.N.

1979-03-15T23:59:59.000Z

96

Electric and Hybrid Vehicle System Research and Development Project: Hybrid Vehicle Potential Assessment. Volume 1. Summary  

DOE Green Energy (OSTI)

The results of investigations conducted under Ce Hybrid Vehicle Potential Assessment Task are reported in 10 volumes. This volume contains an overview of the study and its results. The purpose of the overall study was to determine if the petroleum fuel savings achievable through the use of hybrid electric vehicles is worth the R and D expenditures needed to develop the hybrid vehicles and to determine R and D priorities. It was concluded that by the year 2010 hybrid vehicles could replace 80% of the automotive power that would otherwise be produced from petroleum fuels; the public should not suffer any mobility loss through the use of hybrid vehicles; high initial and life-cycle costs are a limiting factor; and R and D funds should be spent for systems design and the development of low-cost batteries and controllers. (LCL)

Surber, F.T.

1979-09-30T23:59:59.000Z

97

Sensitivity Analysis of Limit-Cycle Oscillating Hybrid Systems  

E-Print Network (OSTI)

A theory is developed for local, first-order sensitivity analysis of limit-cycle oscillating hybrid systems, which are dynamical systems exhibiting both continuous-state and discrete-state dynamics whose state trajectories ...

Khan, Kamil A.

98

San Juanico Hybrid System Technical and Institutional Assessment: Preprint  

DOE Green Energy (OSTI)

San Juanico is a fishing village of approximately 120 homes in the Municipality of Comondu, Baja California. In April, 1999, a hybrid power system was installed in San Juanico to provide 24-hour power, which was not previously available. Before the installation of the hybrid power system, a field study was conducted to characterize the electrical usage and institutional and social framework of San Juanico. One year after the installation of the hybrid power system a''post-electrification'' study was performed to document the changes that had occurred after the installation. In December of 2003, NREL visited the site to conduct a technical assessment of the system.

Corbus, D.; Newcomb, C.; Yewdall, Z.

2004-07-01T23:59:59.000Z

99

Nuclear Hybrid Energy System Modeling: RELAP5 Dynamic Coupling Capabilities  

SciTech Connect

The nuclear hybrid energy systems (NHES) research team is currently developing a dynamic simulation of an integrated hybrid energy system. A detailed simulation of proposed NHES architectures will allow initial computational demonstration of a tightly coupled NHES to identify key reactor subsystem requirements, identify candidate reactor technologies for a hybrid system, and identify key challenges to operation of the coupled system. This work will provide a baseline for later coupling of design-specific reactor models through industry collaboration. The modeling capability addressed in this report focuses on the reactor subsystem simulation.

Piyush Sabharwall; Nolan Anderson; Haihua Zhao; Shannon Bragg-Sitton; George Mesina

2012-09-01T23:59:59.000Z

100

Study on Electric Control System for a Full Hybrid Bus  

Science Conference Proceedings (OSTI)

For efficient and reliable operation of a novel hybrid powertrain assembled in the bus, a set of control strategy combined with the structural characteristics was researched. Based on the identification of the driver's intension, this paper presented ... Keywords: full hybrid bus, eletric control system, stretegy, fuel economy

Zhiguo Kong, Hongxiu Wang

2013-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Modeling, simulation, sensitivity analysis, and optimization of hybrid systems  

Science Conference Proceedings (OSTI)

Hybrid (discrete/continuous) systems exhibit both discrete state and continuous state dynamics which interact to such a significant extent that they cannot be decoupled and must be analyzed simultaneously. We present an overview of the work that has ... Keywords: Hybrid automata, combined discrete/continuous simulation, consistent reinitialization, discontinuities, sensitivity analysis, state events, transitions

Paul I. Barton; Cha Kun Lee

2002-10-01T23:59:59.000Z

102

Battery control system for hybrid vehicle and method for controlling a hybrid vehicle battery  

DOE Patents (OSTI)

A battery control system for hybrid vehicle includes a hybrid powertrain battery, a vehicle accessory battery, and a prime mover driven generator adapted to charge the vehicle accessory battery. A detecting arrangement is configured to monitor the vehicle accessory battery's state of charge. A controller is configured to activate the prime mover to drive the generator and recharge the vehicle accessory battery in response to the vehicle accessory battery's state of charge falling below a first predetermined level, or transfer electrical power from the hybrid powertrain battery to the vehicle accessory battery in response to the vehicle accessory battery's state of charge falling below a second predetermined level. The invention further includes a method for controlling a hybrid vehicle powertrain system.

Bockelmann, Thomas R. (Battle Creek, MI); Hope, Mark E. (Marshall, MI); Zou, Zhanjiang (Battle Creek, MI); Kang, Xiaosong (Battle Creek, MI)

2009-02-10T23:59:59.000Z

103

Hybrid Vapor Compression Adsorption System: Thermal Storage Using Hybrid Vapor Compression Adsorption System  

SciTech Connect

HEATS Project: UTRC is developing a new climate-control system for EVs that uses a hybrid vapor compression adsorption system with thermal energy storage. The targeted, closed system will use energy during the battery-charging step to recharge the thermal storage, and it will use minimal power to provide cooling or heating to the cabin during a drive cycle. The team will use a unique approach of absorbing a refrigerant on a metal salt, which will create a lightweight, high-energy-density refrigerant. This unique working pair can operate indefinitely as a traditional vapor compression heat pump using electrical energy, if desired. The project will deliver a hot-and-cold battery that provides comfort to the passengers using minimal power, substantially extending the driving range of EVs.

None

2012-01-04T23:59:59.000Z

104

Routing in Cyber Physical Systems with Application for Voltage Control in Microgrids: A Hybrid System Approach  

Science Conference Proceedings (OSTI)

A key challenge of cyber physical system is how to design the communication system. In this paper, the framework of hybrid system which consists of both continuous and discrete system states is adopted for the communication system design, particularly ... Keywords: cyber physical system, hybrid systems, routing

Husheng Li; Robert C. Qiu; Zhiqiang Wu

2012-06-01T23:59:59.000Z

105

A Hybrid System for Learning Sunspot Recognition and Classification  

Science Conference Proceedings (OSTI)

Sunspots observation and classification are important tasks for solar astronomers. The activity of sunspots can give clues to the timing of solar flares and the solar weather in general. This paper describes a hybrid system for automatic sunspot recognition ...

Trung Thanh Nguyen; Claire P. Willis; Derek J. Paddon; Hung Son Nguyen

2006-11-01T23:59:59.000Z

106

Hybrid Cooling Systems for Low-Temperature Geothermal Power Production  

NLE Websites -- All DOE Office Websites (Extended Search)

LLC. Contract No. DE-AC36-08GO28308 Hybrid Cooling Systems for Low-Temperature Geothermal Power Production Andrea Ashwood and Desikan Bharathan Technical Report NREL...

107

Page placement in hybrid memory systems  

Science Conference Proceedings (OSTI)

Phase-Change Memory (PCM) technology has received substantial attention recently. Because PCM is byte-addressable and exhibits access times in the nanosecond range, it can be used in main memory designs. In fact, PCM has higher density and lower idle ... Keywords: hybrid memory, memory controller, phase-change memory

Luiz E. Ramos; Eugene Gorbatov; Ricardo Bianchini

2011-05-01T23:59:59.000Z

108

NREL: Vehicle Systems Analysis - Plug-In Hybrid Electric Vehicles  

NLE Websites -- All DOE Office Websites (Extended Search)

Plug-In Hybrid Electric Vehicles Plug-In Hybrid Electric Vehicles NREL's vehicle systems analysts work to advance the technology of plug-in hybrid electric vehicles (PHEVs), also known as grid-connected or grid-charged hybrids. Technology Targets and Metrics Analysis We use our Technical Targets Tool to determine pathways for maximizing the potential national impact of plug-in hybrid electric vehicles. This assessment includes consideration of how consumers will value the new vehicle technology based on attributes such as: Acceleration Fuel economy and consumption Cargo capacity Cost. We use the resulting competitiveness index to predict the vehicle's market penetration rate. Then, we can create a total national benefits picture after adding in other factors such as: Existing fleet turnover

109

An intelligent power system stabilizer based hybrid fuzzy learning algorithm  

Science Conference Proceedings (OSTI)

This work aims to develop two adaptive fuzzy control techniques applied on excitation control system for turbo- Alternators, to simulate an Automatic Voltage Regulator and Power Systems Stabilizer (AVR-PSS) in transient stability power system analysis: ... Keywords: ANFIS, AVR - PSS, PID control, fuzzy controller, hybrid learning algorithm, power system stability and robustness, turbo-alternators and excitation

Abdellatif Naceri; Ahmed Massoum; Mohamed Abid

2011-09-01T23:59:59.000Z

110

Living off-grid in an arid environment without a well : can residential and commercial/industrial water harvesting help solve water supply problems?  

Science Conference Proceedings (OSTI)

Our family of three lives comfortably off-grid without a well in an arid region ({approx}9 in/yr, average). This year we expect to achieve water sustainability with harvested or grey water supporting all of our needs (including a garden and trees), except drinking water (about 7 gallons/week). We discuss our implementation and the implication that for an investment of a few thousand dollars, many single family homes could supply a large portion of their own water needs, significantly reducing municipal water demand. Generally, harvested water is very low in minerals and pollutants, but may need treatment for microbes in order to be potable. This may be addressed via filters, UV light irradiation or through chemical treatment (bleach). Looking further into the possibility of commercial water harvesting from malls, big box stores and factories, we ask whether water harvesting could supply a significant portion of potable water by looking at two cities with water supply problems. We look at the implications of separate municipal water lines for potable and clean non-potable uses. Implications on changes to future building codes are explored.

Axness, Carl L.; Ferrando, Ana

2010-08-01T23:59:59.000Z

111

SIMULATED BUILDING ENERGY PERFORMANCE OF SINGLE-FAMILY DETACHED RESIDENCES DESIGNED FOR OFF-GRID, OFF-PIPE OPERATION  

SciTech Connect

This paper presents the analysis of energy performance of single-family detached homes in three U.S. climates, in order to determine energy-efficiency measures for minimizing the loads and sizing requirements of renewable energy systems that are essential for its offgrid, off-pipe (i.e., utility-independent) operation. The analysis used a DOE-2.1e simulation model of a 2000/2001 IECC (International Energy Conservation Code) standard house as a base case in three climate locations: Minneapolis, MN, Atlanta, GA, and Phoenix, AZ. This selection of measures and determination of loads for renewable energy systems were accomplished by analyzing the energy use using DOE-2.1e simulations and heating/cooling load components using the Manual J Average Load Procedure. The analysis showed several aspects of building energy performance during different times of the year in terms of available energy resources that are critical for the sizing, utilization, and cost effectiveness of renewable energy systems.

Malhotra, Mini [ORNL; Haberl, Dr. Jeff S. [Texas A& M University

2010-01-01T23:59:59.000Z

112

Hybrid Geothermal Heat Pump System Research Geothermal Project | Open  

Open Energy Info (EERE)

Hybrid Geothermal Heat Pump System Research Geothermal Project Hybrid Geothermal Heat Pump System Research Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Hybrid Geothermal Heat Pump System Research Project Type / Topic 1 Recovery Act - Geothermal Technologies Program: Ground Source Heat Pumps Project Type / Topic 2 Topic Area 2: Data Gathering and Analysis Project Description Geothermal, or ground-source heat pump systems have been shown to have superior energy performance to conventional heating and cooling systems in many building types and climates. There has been significant growth in the application of these systems; yet, geothermal systems have only been able to capture a few percent of the heating and cooling market. This is due primarily to the prohibitively high cost of installing the necessary ground loop.

113

Extending the lifetime of fuel cell based hybrid systems  

E-Print Network (OSTI)

Fuel cells are clean power sources that have much higher energy densities and lifetimes compared to batteries. However, fuel cells have limited load following capabilities and cannot be efficiently utilized if used in isolation. In this work, we consider a hybrid system where a fuel cell based hybrid power source is used to provide power to a DVFS processor. The hybrid power source consists of a room temperature fuel cell operating as the primary power source and a Li-ion battery (that has good load following capability) operating as the secondary source. Our goal is to develop polices to extend the lifetime of the fuel cell based hybrid system. First, we develop a charge based optimization framework which minimizes the charge loss of the hybrid system (and not the energy consumption of the DVFS processor). Next, we propose a new algorithm to minimize the charge loss by judiciously scaling the load current. We compare the performance of this algorithm with one that has been optimized for energy, and demonstrate its superiority. Finally, we evaluate the performance of the hybrid system under different system configurations and show how to determine the best combination of fuel cell size and battery capacity for a given embedded application.

Jianli Zhuo; Chaitali Chakrabarti; Naehyuck Chang; Sarma Vrudhula

2006-01-01T23:59:59.000Z

114

Analysis of advanced solar hybrid desiccant cooling systems for buildings  

DOE Green Energy (OSTI)

This report describes an assessment of the energy savings possible from developing hybrid desiccant/vapor-compression air conditioning systems. Recent advances in dehumidifier design for solar desiccant cooling systems have resulted in a dehumidifier with a low pressure drop and high efficiency in heat and mass transfer. A recent study on hybrid desiccant/vapor compression systems showed a 30%-80% savings in resource energy when compared with the best conventional systems with vapor compression. A system consisting of a dehumidifier with vapor compression subsystems in series was found to be the simplest and best overall performer.

Schlepp, D.; Schultz, K.

1984-10-01T23:59:59.000Z

115

Quantified Differential Dynamic Logic for Distributed Hybrid Systems  

E-Print Network (OSTI)

We address a fundamental mismatch between the combinations of dynamics that occur in complex physical systems and the limited kinds of dynamics supported in analysis. Modern applications combine communication, computation, and control. They may even form dynamic networks, where neither structure nor dimension stay the same while the system follows mixed discrete and continuous dynamics. We provide the logical foundations for closing this analytic gap. We develop a system model for distributed hybrid systems that combines quantified differential equations with quantified assignments and dynamic dimensionality-changes. We introduce a dynamic logic for verifying distributed hybrid systems and present a proof calculus for it. We prove that this calculus is a sound and complete axiomatization of the behavior of distributed hybrid systems relative to quantified differential equations. In our calculus we have proven collision freedom in distributed car control even when new cars may appear dynamically on the road.

Andr Platzer

2010-01-01T23:59:59.000Z

116

Energy-Efficient Building HVAC Control Using Hybrid System LBMPC  

E-Print Network (OSTI)

Improving the energy-efficiency of heating, ventilation, and air-conditioning (HVAC) systems has the potential to realize large economic and societal benefits. This paper concerns the system identification of a hybrid system model of a building-wide HVAC system and its subsequent control using a hybrid system formulation of learning-based model predictive control (LBMPC). Here, the learning refers to model updates to the hybrid system model that incorporate the heating effects due to occupancy, solar effects, outside air temperature (OAT), and equipment, in addition to integrator dynamics inherently present in low-level control. Though we make significant modeling simplifications, our corresponding controller that uses this model is able to experimentally achieve a large reduction in energy usage without any degradations in occupant comfort. It is in this way that we justify the modeling simplifications that we have made. We conclude by presenting results from experiments on our building HVAC testbed, which s...

Aswani, Anil; Taneja, Jay; Krioukov, Andrew; Culler, David; Tomlin, Claire

2012-01-01T23:59:59.000Z

117

Analysis of the seasonal performance of hybrid desiccant cooling systems  

DOE Green Energy (OSTI)

A simulation model for the liquid desiccant component of a hybrid system was developed. An analysis of experimental test data was conducted. The liquid desiccant component was examined and the sensitivity of its seasonal performance to changes in principal component variables was identified. Seasonal simulations were performed on different operation modes of a hybrid liquid desiccant cooling system. The results were analyzed in terms of estimated operational costs and compared to the equivalent cost estimation of a conventional cooling system. The study showed that the investigated liquid desiccant configuration usually will not lower the costs of operation. A suggestion of an improved system is made.

Sick, F.

1987-04-01T23:59:59.000Z

118

A Monolithic Microconcentrator Receiver For A Hybrid PV?Thermal System: Preliminary Performance  

Science Conference Proceedings (OSTI)

An innovative hybrid PV?thermal microconcentrator (MCT) system is being jointly developed by Chromasun Inc.

D. Walter; V. Everett; M. Vivar; J. Harvey; R. Van Scheppingen; S. Surve; J. Muric?Nesic; A. Blakers

2010-01-01T23:59:59.000Z

119

Analysis of Ultracapacitor-VRLA Energy Storage Systems for Mild Hybrids (Presentation)  

DOE Green Energy (OSTI)

Presents an analysis of VRLA + ultracapacitor use as energy storage systems in mild hybrid vehicles.

Markel, T.; Pesaran, A.; Sprik, S.

2005-06-01T23:59:59.000Z

120

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

DOE Green Energy (OSTI)

This report summarizes the work performed by Hybrid Power Generation Systems, LLC during the October 2002 to December 2002 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a turbogenerator. The following activities have been carried out during this reporting period: {lg_bullet} Conceptual system design trade studies were performed {lg_bullet} Part-load performance analysis was conducted {lg_bullet} Primary system concept was down-selected {lg_bullet} Dynamic control model has been developed {lg_bullet} Preliminary heat exchanger designs were prepared {lg_bullet} Pressurized SOFC endurance testing was performed

Nguyen Minh; Faress Rahman

2002-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

INEXPENSIVE, OFF THE SHELF HYBRID MICROWAVE SYSTEM  

Science Conference Proceedings (OSTI)

A hybrid-heating microwave oven provides the energy to heat small 10-gram samples of spent metal tritide storage bed material to release tenaciously held decay product {sup 3}He. Complete mass balance procedures require direct measurement of added or produced gases on a tritide bed, and over 1100 C is necessary to release deep trapped {sup 3}He. The decomposition of non-radioactive CaCO{sub 3} and the quantitative measurement of CO{sub 2} within 3% of stoichiometry demonstrate the capabilities of the apparatus to capture generated (released) gases.

Walters, T; Paul Burket, P; John Scogin, J

2007-06-21T23:59:59.000Z

122

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

DOE Green Energy (OSTI)

This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) during the January to June 2004 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a micro-turbine. In addition, an activity included in this program focuses on the development of an integrated coal gasification fuel cell system concept based on planar SOFC technology. Also, another activity included in this program focuses on the development of SOFC scale up strategies.

Nguyen Minh

2004-07-04T23:59:59.000Z

123

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

SciTech Connect

This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) during the July 2003 to December 2003 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a micro-turbine. In addition, an activity included in this program focuses on the development of an integrated coal gasification fuel cell system concept based on planar SOFC technology. Also, another activity included in this program focuses on the development of SOFC scale up strategies.

Faress Rahman; Nguyen Minh

2004-01-04T23:59:59.000Z

124

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

SciTech Connect

This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) during the January to June 2004 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a micro-turbine. In addition, an activity included in this program focuses on the development of an integrated coal gasification fuel cell system concept based on planar SOFC technology. Also, another activity included in this program focuses on the development of SOFC scale up strategies.

Nguyen Minh

2004-07-04T23:59:59.000Z

125

Hybrid energy system cost analysis: San Nicolas Island, California  

DOE Green Energy (OSTI)

This report analyzes the local wind resource and evaluates the costs and benefits of supplementing the current diesel-powered energy system on San Nicolas Island, California (SNI), with wind turbines. In Section 2.0 the SNI site, naval operations, and current energy system are described, as are the data collection and analysis procedures. Section 3.0 summarizes the wind resource data and analyses that were presented in NREL/TP 442-20231. Sections 4.0 and 5.0 present the conceptual design and cost analysis of a hybrid wind and diesel energy system on SNI, with conclusions following in Section 6. Appendix A presents summary pages of the hybrid system spreadsheet model, and Appendix B contains input and output files for the HYBRID2 program.

Olsen, T.L.; McKenna, E.

1996-07-01T23:59:59.000Z

126

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

DOE Green Energy (OSTI)

This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) during the July 2003 to December 2003 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a micro-turbine. In addition, an activity included in this program focuses on the development of an integrated coal gasification fuel cell system concept based on planar SOFC technology. Also, another activity included in this program focuses on the development of SOFC scale up strategies.

Faress Rahman; Nguyen Minh

2004-01-04T23:59:59.000Z

127

Hydrogen atom as a quantum-classical hybrid system  

E-Print Network (OSTI)

Hydrogen atom is studied as a quantum-classical hybrid system, where the proton is treated as a classical object while the electron is regarded as a quantum object. We use a well known mean-field approach to describe this hybrid hydrogen atom; the resulting dynamics for the electron and the proton is compared to their full quantum dynamics. The electron dynamics in the hybrid description is found to be only marginally different from its full quantum counterpart. The situation is very different for the proton: in the hybrid description, the proton behaves like a free particle; in the fully quantum description, the wave packet center of the proton orbits around the center of mass. Furthermore, we find that the failure to describe the proton dynamics properly can be regarded as a manifestation of the fact that there is no conservation of momentum in the mean-field hybrid approach. We expect that such a failure is a common feature for all existing approaches for quantum-classical hybrid systems of Born-Oppenheimer type.

Fei Zhan; Biao Wu

2013-02-07T23:59:59.000Z

128

Software system for simulation of electric power processes in photovoltaic-hybrid system  

Science Conference Proceedings (OSTI)

The software system for modeling and simulation of the processes of electric power conversion in Photovoltaic-hybrid energy system is described. The electrical models and characteristics of photovoltaic generator and other system components are included ... Keywords: PV-hybrid system, electric power simulation, programme models

Katerina Gabrovska; Andreas Wagner; Nikolay Mihailov

2004-06-01T23:59:59.000Z

129

Electron-State Hybridization in Heavy-Fermion Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Electron-State Hybridization in Electron-State Hybridization in Heavy-Fermion Systems Electron-State Hybridization in Heavy-Fermion Systems Print Wednesday, 27 September 2006 00:00 Heavy-fermion systems are characterized by electrons with extremely large effective masses. The corresponding heavy-electron "quasiparticle" states are close to the Fermi energy and govern the thermodynamic, transport, and, in part, magnetic properties of these materials. In the case of rare-earth compounds, the quasiparticle states arise from the interactions (hybridization) of valence states with strongly localized 4f states. The question as to whether it is sufficient to treat the f states as localized impurities (single-impurity Anderson model) or whether the periodic crystal symmetry must be considered (periodic Anderson model) has been the subject of extensive debate. An international team of researchers from Germany, Ukraine, India, and the U.S. has performed angle-resolved photoemission spectroscopy (ARPES) studies of the heavy-fermion system YbIr2Si2. The results show a strong momentum (directional) dependence of the hybridization that clearly rules out the single-impurity model in favor of the lattice model.

130

Multilevel splitting for reachability analysis of stochastic hybrid systems  

Science Conference Proceedings (OSTI)

Biochemical research is increasingly using formal modeling, simulation, and analysis methods to improve the understanding of complex systems. Probabilistic analysis techniques such as Monte Carlo methods can be used to determine reachability or safety ... Keywords: Monte Carlo, stochastic hybrid systems, variance reduction

Derek Riley; Xenofon Koutsoukos; Kasandra Riley

2010-07-01T23:59:59.000Z

131

Hybrid checkpointing using emerging nonvolatile memories for future exascale systems  

Science Conference Proceedings (OSTI)

The scalability of future Massively Parallel Processing (MPP) systems is being severely challenged by high failure rates. Current centralized Hard Disk Drive (HDD) checkpointing results in overhead of 25% or more at petascale. Since systems become ... Keywords: Checkpoint, background checkpoint, checkpoint prototype, exascale, hybrid checkpoint, in-disk checkpoint, in-memory checkpoint, incremental checkpoint, optimum checkpoint model, petascale, phase-change memory

Xiangyu Dong; Yuan Xie; Naveen Muralimanohar; Norman P. Jouppi

2011-07-01T23:59:59.000Z

132

ASGrid: autonomic management of hybrid sensor grid systems and applications  

Science Conference Proceedings (OSTI)

In this paper, we propose an autonomic management framework (ASGrid) to address the requirements of emerging large-scale applications in hybrid grid and sensor network systems. To the best of our knowledge, we are the first who proposed the ... Keywords: P2P, WSNs, autonomic computing, autonomic management, autonomic sensor grid, data aggregation, grid computing, hybrid distributed systems, key management, network security, peer computing, peer-to-, self-configuration, self-optimisation, self-protection, task scheduling, trust management, wireless sensor networks

Xiaolin Li; Xinxin Liu; Han Zhao; Huanyu Zhao; Nanyan Jiang; Manish Parashar

2009-11-01T23:59:59.000Z

133

Hybrid approach to failure prediction for advanced computing systems |  

NLE Websites -- All DOE Office Websites (Extended Search)

Hybrid approach to failure prediction for advanced computing systems Hybrid approach to failure prediction for advanced computing systems January 8, 2014 Tweet EmailPrint "Fault tolerance is no longer an option but a necessity," states Franck Cappello, project manager of research on resilience at the extreme scale at Argonne National Laboratory. "And the ability to reliably predict failures can significantly reduce the overhead of fault-tolerance strategies and the recovery cost." In a special issue article in the International Journal of High Performance Computing Applications, Cappello and his colleagues at Argonne and the University of Illinois at Urbana-Champaign (UIUC) discuss issues in failure prediction and present a new hybrid approach to overcome the limitations of current models. One popular way of building prediction models is to analyze log files,

134

Hybrid  

NLE Websites -- All DOE Office Websites (Extended Search)

may prove to be a limitation for realizing technologies for very high gradient accelerators. In this article, we present a scheme that uses a hybrid dielectric and iris-loaded...

135

Development of Integrated Motor Assist Hybrid System: Development of the 'Insight', a Personal Hybrid Coupe  

DOE Green Energy (OSTI)

This paper presents the technical approach used to design and develop the powerplant for the Honda Insight, a new motor assist hybrid vehicle with an overall development objective of just half the fuel consumption of the current Civic over a wide range of driving conditions. Fuel consumption of 35km/L (Japanese 10-15 mode), and 3.4L/100km (98/69/EC) was realized. To achieve this, a new Integrated Motor Assist (IMA) hybrid power plant system was developed, incorporating many new technologies for packaging and integrating the motor assist system and for improving engine thermal efficiency. This was developed in combination with a new lightweight aluminum body with low aerodynamic resistance. Environmental performance goals also included the simultaneous achievement of low emissions (half the Japanese year 2000 standards, and half the EU2000 standards), high efficiency, and recyclability. Full consideration was also given to key consumer attributes, including crash safety performance, handling, and driving performance.

Kaoru Aoki; Shigetaka Kuroda; Shigemasa Kajiwara; Hiromitsu Sato; Yoshio Yamamoto

2000-06-19T23:59:59.000Z

136

Sandia National Laboratories Hybrid System for Separating ...  

Oil and gas Refining ... delivering oxygen gas at purities greater than 98 percent and flow rates significantly greater than commercially available systems.

137

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

DOE Green Energy (OSTI)

This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) under Cooperative Agreement DE-FC2601NT40779 for the US Department of Energy, National Energy Technology Laboratory (DoE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a gas turbine. A conceptual hybrid system design was selected for analysis and evaluation. The selected system is estimated to have over 65% system efficiency, a first cost of approximately $650/kW, and a cost of electricity of 8.4 cents/kW-hr. A control strategy and conceptual control design have been developed for the system. A number of SOFC module tests have been completed to evaluate the pressure impact to performance stability. The results show that the operating pressure accelerates the performance degradation. Several experiments were conducted to explore the effects of pressure on carbon formation. Experimental observations on a functioning cell have verified that carbon deposition does not occur in the cell at steam-to-carbon ratios lower than the steady-state design point for hybrid systems. Heat exchanger design, fabrication and performance testing as well as oxidation testing to support heat exchanger life analysis were also conducted. Performance tests of the prototype heat exchanger yielded heat transfer and pressure drop characteristics consistent with the heat exchanger specification. Multicell stacks have been tested and performance maps were obtained under hybrid operating conditions. Successful and repeatable fabrication of large (>12-inch diameter) planar SOFC cells was demonstrated using the tape calendering process. A number of large area cells and stacks were successfully performance tested at ambient and pressurized conditions. A 25 MW plant configuration was selected with projected system efficiency of over 65% and a factory cost of under $400/kW. The plant design is modular and can be scaled to both higher and lower plant power ratings. Integrated gasification fuel cell systems or IGFCs were developed and analyzed for plant sizes in excess of 200 MW. Two alternative integration configurations were selected with projected system efficiency of over 53% on a HHV basis, or about 10 percentage points higher than that of the state-of-the-art Integrated Gasification Combined Cycle (IGCC) systems.

Nguyen Minh

2005-12-01T23:59:59.000Z

138

Electron-State Hybridization in Heavy-Fermion Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Electron-State Hybridization in Heavy-Fermion Systems Print Electron-State Hybridization in Heavy-Fermion Systems Print Heavy-fermion systems are characterized by electrons with extremely large effective masses. The corresponding heavy-electron "quasiparticle" states are close to the Fermi energy and govern the thermodynamic, transport, and, in part, magnetic properties of these materials. In the case of rare-earth compounds, the quasiparticle states arise from the interactions (hybridization) of valence states with strongly localized 4f states. The question as to whether it is sufficient to treat the f states as localized impurities (single-impurity Anderson model) or whether the periodic crystal symmetry must be considered (periodic Anderson model) has been the subject of extensive debate. An international team of researchers from Germany, Ukraine, India, and the U.S. has performed angle-resolved photoemission spectroscopy (ARPES) studies of the heavy-fermion system YbIr2Si2. The results show a strong momentum (directional) dependence of the hybridization that clearly rules out the single-impurity model in favor of the lattice model.

139

Electron-State Hybridization in Heavy-Fermion Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Electron-State Hybridization in Heavy-Fermion Systems Print Electron-State Hybridization in Heavy-Fermion Systems Print Heavy-fermion systems are characterized by electrons with extremely large effective masses. The corresponding heavy-electron "quasiparticle" states are close to the Fermi energy and govern the thermodynamic, transport, and, in part, magnetic properties of these materials. In the case of rare-earth compounds, the quasiparticle states arise from the interactions (hybridization) of valence states with strongly localized 4f states. The question as to whether it is sufficient to treat the f states as localized impurities (single-impurity Anderson model) or whether the periodic crystal symmetry must be considered (periodic Anderson model) has been the subject of extensive debate. An international team of researchers from Germany, Ukraine, India, and the U.S. has performed angle-resolved photoemission spectroscopy (ARPES) studies of the heavy-fermion system YbIr2Si2. The results show a strong momentum (directional) dependence of the hybridization that clearly rules out the single-impurity model in favor of the lattice model.

140

Hybrid rough sets intelligent system architecture for survival analysis  

Science Conference Proceedings (OSTI)

Survival analysis challenges researchers because of two issues. First, in practice, the studies do not span wide enough to collect all survival times of each individual patient. All of these patients require censor variables and cannot be analyzed without ... Keywords: Kaplan-Meier method, hybrid intelligent systems, reducts, rough sets, soft computing, survival analysis

Puntip Pattaraintakorn; Nick Cercone; Kanlaya Naruedomkul

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Research on the Hybrid Clean Energy Power System  

Science Conference Proceedings (OSTI)

This paper aims to design a hybrid clean energy power system with 3kW by utilizing the complementarities between the clean energies, or with and other energies. It unites the solar photovoltaic (PV) , the wind power, batteries and the diesel generator ... Keywords: clean energy, DC-DC controller, power management, BMS

Chun Wang, Zuhua Fang, Tingting Hong, Wen Lv, Ying Sun, Hongbing Xu, Jiajia Li, Younan Wang, Peiying Han

2012-07-01T23:59:59.000Z

142

Analysis of hybrid power system incorporating squirrel cage induction generators  

Science Conference Proceedings (OSTI)

This paper presents generic model of hybrid power system consisting in a combined solution one wind turbine with asynchronous generator and on hydro generator with synchronous machine. This technology was developed by to reduce the cost of supplying ... Keywords: asynchronous generator, homer, optimal design, renewable energy, variable speed generation, voltage and frequency controller, water flow

Sorin Ioan Deaconu; Marcel Topor; Gabriel Nicolae Popa; Diana Bistrian

2009-07-01T23:59:59.000Z

143

Hybrid System for fouling control in biomass boilers  

Science Conference Proceedings (OSTI)

Renewable energy sources are essential paths towards sustainable development and CO"2 emission reduction. For example, the European Union has set the target of achieving 22% of electricity generation from renewable sources by 2010. However, the extensive ... Keywords: Biomass, Boiler fouling, Hybrid system

Luis M. Romeo; Raquel Gareta

2006-12-01T23:59:59.000Z

144

A hybrid system model of seasonal snowpack water balance  

Science Conference Proceedings (OSTI)

It is estimated that seasonal snow cover is the primary source of water supply for over 60 million people in the western United States. Informed decision making, which ensures reliable and equitable distribution of this limited water resource, thus needs ... Keywords: hybrid systems, hydrology, snowmelt, water resources

Branko Kerkez; Steven D. Glaser; John A. Dracup; Roger C. Bales

2010-04-01T23:59:59.000Z

145

Borazine-boron nitride hybrid hydrogen storage system  

DOE Patents (OSTI)

A hybrid hydrogen storage composition includes a first phase and a second phase adsorbed on the first phase, the first phase including BN for storing hydrogen by physisorption and the second phase including a borazane-borazine system for storing hydrogen in combined form as a hydride.

Narula, Chaitanya K. (Knoxville, TN); Simonson, J. Michael (Knoxville, TN); Maya, Leon (Knoxville, TN); Paine, Robert T. (Albuquerque, NM)

2008-04-22T23:59:59.000Z

146

1978 source book for fusion--fission hybrid systems  

SciTech Connect

This study summarizes the promise and timing of the hybrid concept and culminates in a generic R and D timetable. This document emphasizes the meaningfulness of the concept to tomorrow's energy needs and energy production systems rather than strict analysis of technical feasibility. (MOW)

Crowley, J.H.; Pavlenco, G.F.; Kaminski, R.S.

1978-12-01T23:59:59.000Z

147

Electron-State Hybridization in Heavy-Fermion Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Electron-State Hybridization in Heavy-Fermion Systems Print Electron-State Hybridization in Heavy-Fermion Systems Print Heavy-fermion systems are characterized by electrons with extremely large effective masses. The corresponding heavy-electron "quasiparticle" states are close to the Fermi energy and govern the thermodynamic, transport, and, in part, magnetic properties of these materials. In the case of rare-earth compounds, the quasiparticle states arise from the interactions (hybridization) of valence states with strongly localized 4f states. The question as to whether it is sufficient to treat the f states as localized impurities (single-impurity Anderson model) or whether the periodic crystal symmetry must be considered (periodic Anderson model) has been the subject of extensive debate. An international team of researchers from Germany, Ukraine, India, and the U.S. has performed angle-resolved photoemission spectroscopy (ARPES) studies of the heavy-fermion system YbIr2Si2. The results show a strong momentum (directional) dependence of the hybridization that clearly rules out the single-impurity model in favor of the lattice model.

148

SOLID OXIDE FUEL CELL HYBRID SYSTEM FOR DISTRIBUTED POWER GENERATION  

DOE Green Energy (OSTI)

This report summarizes the work performed by Honeywell during the October 2001 to December 2001 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a turbogenerator. The conceptual and demonstration system designs were proposed and analyzed, and these systems have been modeled in Aspen Plus. Work has also started on the assembly of dynamic component models and the development of the top-level controls requirements for the system. SOFC stacks have been fabricated and performance mapping initiated.

Kurt Montgomery; Nguyen Minh

2003-08-01T23:59:59.000Z

149

SOLID OXIDE FUEL CELL HYBRID SYSTEM FOR DISTRIBUTED POWER GENERATION  

DOE Green Energy (OSTI)

This report summarizes the work performed by Hybrid Power Generation Systems, LLC during the January 2003 to June 2003 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a micro-turbine. In addition, an activity included in this program focuses on the development of an integrated coal gasification fuel cell system concept based on planar SOFC technology. This report summarizes the results obtained to date on: System performance analysis and model optimization; Reliability and cost model development; System control including dynamic model development; Heat exchanger material tests and life analysis; Pressurized SOFC evaluation; and Pre-baseline system definition for coal gasification fuel cell system concept.

Faress Rahman; Nguyen Minh

2003-07-01T23:59:59.000Z

150

Robust execution for stochastic hybrid systems  

E-Print Network (OSTI)

Unmanned systems, such as Autonomous Underwater Vehicles (AUVs), planetary rovers and space probes, have enormous potential in areas such as reconnaissance and space exploration. However the effectiveness and robustness ...

Blackmore, Lars James Christopher

2007-01-01T23:59:59.000Z

151

ANALYSIS OF CONTROL SYSTEMS FOR VEHICLE HYBRID POWERTRAINS  

E-Print Network (OSTI)

Abstract. Ecological and socioeconomic factors determine high interest in the development of pollution-free vehicles. At present use of electro-vehicles is suppressed by a number of technological factors. Vehicles with alternative powertrains are transitional stage between development of pollution-free vehicles and vehicles with conventional internal combustion engine. According to these aspects the investigation on conventional hybrid drives and their control systems is carried out in the article. The equations that allow evaluating effectiveness of regenerative braking for different variants of hybrid drive are given. The AMESim software is used as the modeling environment, in which models of hybrid vehicles are developed and the results of virtual simulation are analyzed. Also a number of recommendations for increasing of regenerative braking effectiveness are given.

Siarhei Kliauzovich

2007-01-01T23:59:59.000Z

152

Hybrid two fuel system nozzle with a bypass connecting the two fuel systems  

Science Conference Proceedings (OSTI)

A hybrid fuel combustion nozzle for use with natural gas, syngas, or other types of fuels. The hybrid fuel combustion nozzle may include a natural gas system with a number of swozzle vanes and a syngas system with a number of co-annular fuel tubes.

Varatharajan, Balachandar (Cincinnati, OH); Ziminsky, Willy Steve (Simpsonville, SC); Yilmaz, Ertan (Albany, NY); Lacy, Benjamin (Greer, SC); Zuo, Baifang (Simpsonville, SC); York, William David (Greer, SC)

2012-05-29T23:59:59.000Z

153

Battery control system for hybrid vehicle and method for controlling a hybrid vehicle battery  

DOE Patents (OSTI)

A battery control system for controlling a state of charge of a hybrid vehicle battery includes a detecting arrangement for determining a vehicle operating state or an intended vehicle operating state and a controller for setting a target state of charge level of the battery based on the vehicle operating state or the intended vehicle operating state. The controller is operable to set a target state of charge level at a first level during a mobile vehicle operating state and at a second level during a stationary vehicle operating state or in anticipation of the vehicle operating in the stationary vehicle operating state. The invention further includes a method for controlling a state of charge of a hybrid vehicle battery.

Bockelmann, Thomas R. (Battle Creek, MI); Beaty, Kevin D. (Kalamazoo, MI); Zou, Zhanijang (Battle Creek, MI); Kang, Xiaosong (Battle Creek, MI)

2009-07-21T23:59:59.000Z

154

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

SciTech Connect

This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) during the April to October 2004 reporting period in Task 2.3 (SOFC Scaleup for Hybrid and Fuel Cell Systems) under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL), entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. This study analyzes the performance and economics of power generation systems for central power generation application based on Solid Oxide Fuel Cell (SOFC) technology and fueled by natural gas. The main objective of this task is to develop credible scale up strategies for large solid oxide fuel cell-gas turbine systems. System concepts that integrate a SOFC with a gas turbine were developed and analyzed for plant sizes in excess of 20 MW. A 25 MW plant configuration was selected with projected system efficiency of over 65% and a factory cost of under $400/kW. The plant design is modular and can be scaled to both higher and lower plant power ratings. Technology gaps and required engineering development efforts were identified and evaluated.

David Deangelis; Rich Depuy; Debashis Dey; Georgia Karvountzi; Nguyen Minh; Max Peter; Faress Rahman; Pavel Sokolov; Deliang Yang

2004-09-30T23:59:59.000Z

155

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

DOE Green Energy (OSTI)

This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) during the April to October 2004 reporting period in Task 2.3 (SOFC Scaleup for Hybrid and Fuel Cell Systems) under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL), entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. This study analyzes the performance and economics of power generation systems for central power generation application based on Solid Oxide Fuel Cell (SOFC) technology and fueled by natural gas. The main objective of this task is to develop credible scale up strategies for large solid oxide fuel cell-gas turbine systems. System concepts that integrate a SOFC with a gas turbine were developed and analyzed for plant sizes in excess of 20 MW. A 25 MW plant configuration was selected with projected system efficiency of over 65% and a factory cost of under $400/kW. The plant design is modular and can be scaled to both higher and lower plant power ratings. Technology gaps and required engineering development efforts were identified and evaluated.

David Deangelis; Rich Depuy; Debashis Dey; Georgia Karvountzi; Nguyen Minh; Max Peter; Faress Rahman; Pavel Sokolov; Deliang Yang

2004-09-30T23:59:59.000Z

156

Hybrid Power System with a Controlled Energy Storage: Preprint  

DOE Green Energy (OSTI)

We investigated a small isolated hybrid power system that used two types of power generation; wind turbine and diesel generation. The interaction of diesel generation, the wind turbine, and the local load is complicated because both the load and the wind turbine fluctuate during the day. These fluctuations create imbalances in power distribution (energy sources are not equal to energy sinks) that can affect the frequency and the voltage in the power system. The addition of energy storage will help balance the distribution of power in the power network. For this paper, we studied the interaction among hybrid power system components and the relative size of the components. We also show how the contribution of wind energy affects the entire power system and distribution and the role of energy storage under the transient conditions caused by load changes and wind turbine start ups.

Muljadi, E.; Bialasiewicz, J. T.

2003-11-01T23:59:59.000Z

157

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

DOE Green Energy (OSTI)

This report summarizes the work performed by Honeywell during the January 2002 to March 2002 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a turbogenerator. For this reporting period the following activities have been carried out: {lg_bullet} Conceptual system design trade studies were performed {lg_bullet} System-level performance model was created {lg_bullet} Dynamic control models are being developed {lg_bullet} Mechanical properties of candidate heat exchanger materials were investigated {lg_bullet} SOFC performance mapping as a function of flow rate and pressure was completed

Nguyen Minh

2002-03-31T23:59:59.000Z

158

Battery control strategy Diesel generator Fuel consumption Hybrid system  

E-Print Network (OSTI)

Standalone diesel generators (DGs) are widely utilized in remote areas in Indonesia. Some areas use microhydro (MH) systems with DGs backup. However, highly diesel fuel price makes such systems become uneconomical. This paper introduces hybrid photovoltaic (PV)/MH/DG/battery systems with a battery control strategy to minimize the diesel fuel consumption. The method is applied to control the state of charge (SOC) level of the battery based on its previous level and the demand load condition to optimize the DG operation. Simulation results show that operations of the hybrid PV/MH/DG/battery with the battery control strategy needs less fuel consumption than PV/MH/DG and MH/DG systems.

Ayong Hiendro; Yohannes M. Simanjuntak

2012-01-01T23:59:59.000Z

159

Hybrid energy storage system integration for vehicles  

Science Conference Proceedings (OSTI)

Energy consumption and the associated environmental impact are a pressing challenge faced by the transportation sector. Emerging electric-drive vehicles have shown promises for substantial reductions in petroleum use and vehicle emissions. Their success, ... Keywords: analysis, electric-drive vehicles, energy storage systems

Jia Wang; Kun Li; Qin Lv; Hai Zhou; Li Shang

2010-08-01T23:59:59.000Z

160

Hybrid refrigeration/sorption solar-cooling systems  

DOE Green Energy (OSTI)

The hybrid refrigeration/sorption concept is a technically feasible approach to solar cooling which has not yet been systematically evaluated. Various system configurations are possible, each with advantages and disadvantages relative to the others, and with respect to solar cooling systems based on the individual absorption, Rankine, and desiccant technologies. Conventional cooling and dehumidification, sorption dehumidification, and the effects on the refrigeration unit of adding a dehumidifier are discussed.

Curran, H.M.

1981-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

SOLID OXIDE FUEL CELL HYBRID SYSTEM FOR DISTRIBUTED POWER GENERATION  

DOE Green Energy (OSTI)

This report summarizes the work performed by Honeywell during the July 2001 to September 2001 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a turbogenerator. An internal program kickoff was held at Honeywell in Torrance, CA. The program structure was outlined and the overall technical approach for the program was presented to the team members. Detail program schedules were developed and detailed objectives were defined. Initial work has begun on the system design and pressurized SOFC operation.

Unknown

2002-03-01T23:59:59.000Z

162

Plasmon hybridization in parallel nano-wire systems  

Science Conference Proceedings (OSTI)

We apply the plasmon hybridization method to a double-nano-wire system, providing a simple and intuitive description of the plasmon excitations in the system. We apply the two-center cylindrical coordinate system for mathematical convenience and find an explicit form of the surface plasmon oscillations, in terms of the interaction between the bare plasmon modes of the individual surfaces of the nano-wires. We present numerical results to display how the plasmon excitations of the system depend on nano-wire separation when there is no angular momentum transfer, i.e., when m = 0.

Moradi, Afshin [Department of Nano Science, Kermanshah University of Technology, Kermanshah 67178-63766 (Iran, Islamic Republic of) and Department of Nano Science, Institute for Studies in Theoretical Physics and Mathematics (IPM), Tehran 19395-5531 (Iran, Islamic Republic of)

2011-06-15T23:59:59.000Z

163

Energy Storage System Considerations for Grid-Charged Hybrid Electric Vehicles (Presentation)  

DOE Green Energy (OSTI)

Provides an overview of a study regarding energy storage system considerations for a plug-in hybrid electric vehicle.

Markel, T.; Simpson, A.

2005-09-01T23:59:59.000Z

164

Study on Zero CO2 Emission SOFC Hybrid Power System with Steam Injection  

Science Conference Proceedings (OSTI)

Based on a traditional SOFC hybrid power system, a zero CO2 emission SOFC hybrid power system with steam injection is proposed in this paper and its performance is analyzed. Oxy-fuel combustion can burn the fuel gas from anode thoroughly, and increases ... Keywords: solid oxide fuel cell, Aspen Plus, hybrid power system, zero CO2 emission, steam injection

Liqiang Duan; Xiaoyuan Zhang; Yongping Yang; Gang Xu

2010-06-01T23:59:59.000Z

165

Optimal Design of Hybrid Energy System with PV/ Wind Turbine/ Storage: A Case Study  

E-Print Network (OSTI)

Optimal Design of Hybrid Energy System with PV/ Wind Turbine/ Storage: A Case Study Rui Huang development of photovoltaic (PV), wind turbine and battery technologies, hybrid energy system has received of the hybrid energy system that consists of PV arrays, wind turbines and battery storage and use that to define

Low, Steven H.

166

Promethean Power Systems | Open Energy Information  

Open Energy Info (EERE)

Promethean Power Systems Promethean Power Systems Jump to: navigation, search Name Promethean Power Systems Place Cambridge, Massachusetts Zip 2138 Product US-based developer of a solar-powered refrigeration system, specializing in off-grid and partially electrified applications. Coordinates 43.003745°, -89.017499° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.003745,"lon":-89.017499,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

167

Hybrid and electric advanced vehicle systems (heavy) simulation. Final report  

Science Conference Proceedings (OSTI)

A computer program to simulate hybrid and electric advanced vehicle systems (HEAVY) is described. It is intended for use early in the design process: concept evaluation, alternative comparison, preliminary design, control and management strategy development, component sizing, and sensitivity studies. It allows the designer to quickly, conveniently, and economically predict the performance of a proposed drive train. The user defines the system to be simulated using a library of predefined component models that may be connected to represent a wide variety of propulsion systems. The development of three models are discussed as examples.

Hammond, R.A.; McGehee, R.K.

1981-11-01T23:59:59.000Z

168

Evaluation of the 2007 Toyota Camry Hybrid Syneregy Drive System  

Science Conference Proceedings (OSTI)

The U.S. Department of Energy (DOE) and American automotive manufacturers General Motors, Ford, and DaimlerChrysler began a five-year, cost-shared partnership in 1993. Currently, hybrid electric vehicle (HEV) research and development is conducted by DOE through its FreedomCAR and Vehicle Technologies (FCVT) program. The mission of the FCVT program is to develop more energy efficient and environmentally friendly highway transportation technologies. Program activities include research, development, demonstration, testing, technology validation, and technology transfer. These activities are aimed at developing technologies that can be domestically produced in a clean and cost-competitive manner. Under the FCVT program, support is provided through a three-phase approach [1] which is intended to: Identify overall propulsion and vehicle-related needs by analyzing programmatic goals and reviewing industrys recommendations and requirements, then develop the appropriate technical targets for systems, subsystems, and component research and development activities; Develop and validate individual subsystems and components, including electric motors, emission control devices, battery systems, power electronics, accessories, and devices to reduce parasitic losses; and Determine how well the components and subassemblies work together in a vehicle environment or as a complete propulsion system and whether the efficiency and performance targets at the vehicle level have been achieved. The research performed in this area will help remove technical and cost barriers to enable technology for use in such advanced vehicles as hybrid electric, plug-in hybrid electric, electric, and fuel-cell-powered vehicles.

Burress, T.A.; Coomer, C.L.; Campbell, S.L.; Seiber, L.E.; Marlino, L.D.; Staunton, R.H.; Cunningham, J.P.

2008-04-15T23:59:59.000Z

169

Conversion system overview assessment. Volume II. Solar-wind hybrid systems  

SciTech Connect

Solar-wind hybrid systems are discussed. It is shown that there are large areas in the United States where solar and wind resources are comparable in magnitude and there are diurnal and seasonal complementarities which offer the potential for cost-effective hybrid systems. There are also distinct engineering features of the two conversion technologies. Electric power generation from wind is straightforward and cost-effective, whereas solar thermal conversion to generate heat is more cost-effective than to generate electricity. Examples of hybrid systems utilizing these features in total energy applications are presented.

Jayadev, T. S.; Henderson, J.; Bingham, C.

1979-08-01T23:59:59.000Z

170

Control system design for a parallel hybrid electric vehicle  

E-Print Network (OSTI)

This thesis addresses the design of control systems for a parallel hybrid electric drive train which is an alternative to conventional passenger vehicles. The principle components of the drive train are a small internal combustion engine and an electric machine. In the parallel configuration, both devices can apply torque directly to the drive shaft for propelling the vehicle. A low order drive train model is developed which is used during the controller design and overall system simulations. The model is composed of sub-models for the engine, mechanical brake, electric machine, converter, battery, drive shaft with gears, and road load with wind resistance. The model yields results which are rough approximations of component performance and are appropriate for a top level drive train control study. In order to mimic the controls of a conventional car, the hybrid vehicle controller must insure that the torque command given by the user through the accelerator and brake pedal is tracked by the hybrid drive train without error. In this thesis two control systems are designed which enable the drive train to emulate conventional vehicle performance by meeting torque commands. The first control design maximizes the battery state-of-charge by minimizing the torque contribution of the electric machine. The second control design includes a cost parameter allowing the user to specify the appropriate tradeoff between a high state-of-charge and increased fuel savings. Simulation results verify that both controllers achieve the design objectives. Results also suggest that under proper control the parallel hybrid drive train can offer equal performance and range to a conventional passenger vehicle with improved fuel efficiency and reduced emissions.

Buntin, David Leighton

1994-01-01T23:59:59.000Z

171

Hybrid Plasma Reactor/Filter for Transportable Collective Protection Systems  

SciTech Connect

Pacific Northwest National Laboratory (PNNL) has performed an assessment of a Hybrid Plasma/Filter system as an alternative to conventional methods for collective protection. The key premise of the hybrid system is to couple a nonthermal plasma (NTP) reactor with reactive adsorption to provide a broader envelope of protection than can be provided through a single-solution approach. The first step uses highly reactive species (e.g. oxygen radicals, hydroxyl radicals, etc.) created in a nonthermal plasma (NTP) reactor to destroy the majority (~75% - 90%) of an incoming threat. Following the NTP reactor an O3 reactor/filter uses the O3 created in the NTP reactor to further destroy the remaining organic materials. This report summarizes the laboratory development of the Hybrid Plasma Reactor/Filter to protect against a worst-case simulant, methyl bromide (CH3Br), and presents a preliminary engineering assessment of the technology to Joint Expeditionary Collective Protection performance specifications for chemical vapor air purification technologies.

Josephson, Gary B.; Tonkyn, Russell G.; Frye, J. G.; Riley, Brian J.; Rappe, Kenneth G.

2011-04-06T23:59:59.000Z

172

Wind-Diesel Hybrid Systems for Russia's Northern Territories  

DOE Green Energy (OSTI)

This paper will summarize the DOE/Russian Ministry of Fuel and Energy (MF and E) activities in Russia's Northern Territories in the field of hybrid wind-diesel power systems over the last three years (1997-1999). The National Renewable Energy Laboratory (NREL) supplied technical assistance to the project, including resource assessment, system design, site identification, training and system monitoring. As a result, several wind-diesel systems have been installed and are operating in the Arkhangelsk/Murmansk regions and in Chukotka. NREL designed and provided sets of data acquisition equipment to monitor several of the first pilot wind-diesel systems. NREL's computer simulation models are being used for performance data analysis and optimizing of future system configurations.

Gevorgian, V.; Touryan, K. [National Renewable Energy Laboratory (US); Bezrukikh, P. [Ministry of Fuel and Energy of Russian Federation (RU); Bezrukikh, P. Jr.; Karghiev, V. [Intersolarcenter

1999-10-20T23:59:59.000Z

173

Intelligent robust control of hybrid distributed generation system under voltage sag  

Science Conference Proceedings (OSTI)

In this paper, design of control strategy for hybrid fuel cell/energy storage distributed power generation system during voltage sag has been presented. The proposed control strategy allows hybrid distributed generation system works properly when a voltage ... Keywords: Energy storage, Fuel cell, Fuzzy sliding control, Hybrid distributed generation, Lyapanov, Neuro-fuzzy, Voltage sag

Amin Hajizadeh; Masoud Aliakbar Golkar

2010-12-01T23:59:59.000Z

174

Modeling and analysis of hybrid geothermal-solar thermal energy conversion systems  

E-Print Network (OSTI)

Innovative solar-geothermal hybrid energy conversion systems were developed for low enthalpy geothermal resources augmented with solar energy. The goal is to find cost-effective hybrid power cycles that take advantage of ...

Greenhut, Andrew David

2010-01-01T23:59:59.000Z

175

Mild Hybrid System in Combination with Waste Heat Recovery for Commercial Vehicles.  

E-Print Network (OSTI)

?? Performance of two different waste heat recovery systems (one based on Rankine cycle and the other one using thermoelectricity) combined with non-hybrid, mild-hybrid and (more)

Namakian, Mohsen

2013-01-01T23:59:59.000Z

176

US Energy Initiatives Corp formerly Hybrid Fuel Systems Inc | Open Energy  

Open Energy Info (EERE)

US Energy Initiatives Corp formerly Hybrid Fuel Systems Inc US Energy Initiatives Corp formerly Hybrid Fuel Systems Inc Jump to: navigation, search Name US Energy Initiatives Corp (formerly Hybrid Fuel Systems Inc) Place Tampa, Florida Zip 33637 Product Holds patented natural gas/diesel dual fuel technology. References US Energy Initiatives Corp (formerly Hybrid Fuel Systems Inc)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. US Energy Initiatives Corp (formerly Hybrid Fuel Systems Inc) is a company located in Tampa, Florida . References ↑ "US Energy Initiatives Corp (formerly Hybrid Fuel Systems Inc)" Retrieved from "http://en.openei.org/w/index.php?title=US_Energy_Initiatives_Corp_formerly_Hybrid_Fuel_Systems_Inc&oldid=352601"

177

Design of a power management model for a solar/fuel cell hybrid energy system.  

E-Print Network (OSTI)

??This thesis proposes a Power Management Model (PMM) for optimization of several green power generation systems. A Photovoltaic/Fuel cell Hybrid Energy System (PFHES) consisting of (more)

Melendez, Rosana.

2010-01-01T23:59:59.000Z

178

MHK Technologies/Hybrid System | Open Energy Information  

Open Energy Info (EERE)

System System < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Hybrid System.jpg Technology Profile Primary Organization Ryokuseisha Corporation Technology Resource Click here Wave Technology Type Click here Point Absorber - Floating Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description To take advantage of wave power and solar power to provide a stable power source a Wave Activated Generator was combined with a solar battery In stormy the wave activated generator is used and in fair weather solar battery is used to provide a power supply with a high output This is used as the power source for measuring instruments on the islands off the power source for measuring instruments on the islands off the southernmost coast of Japan and for the buoy of the United States Coast Guard and TRINITY HOUSE LIGHTHOUSES SERVICE

179

Control system and method for a hybrid electric vehicle  

DOE Patents (OSTI)

Several control methods are presented for application in a hybrid electric vehicle powertrain including in various embodiments an engine, a motor/generator, a transmission coupled at an input thereof to receive torque from the engine and the motor generator coupled to augment torque provided by the engine, an energy storage device coupled to receive energy from and provide energy to the motor/generator, an engine controller (EEC) coupled to control the engine, a transmission controller (TCM) coupled to control the transmission and a vehicle system controller (VSC) adapted to control the powertrain.

Tamor, Michael Alan (Toledo, OH)

2001-03-06T23:59:59.000Z

180

Structuring of Large-scale Complex Hybrid Systems: from Illustrative Analysis toward Modelization  

Science Conference Proceedings (OSTI)

System structuring is paramount to the development of large-scale complex hybrid systems (LCHS). However, there is no well-established and effective methodology for the structuring of LCHS. Using the approach of illustrating and abstracting, this paper ... Keywords: autonomous system, block-diagram-based model, distributed system, hierarchical system, large-scale complex hybrid system (LCHS), multiple gradation, nested system, nesting, perceptiondecision link, system geometry, system modelization, system structuring

Huaglory Tianfield

2001-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Coil system for a mirror-based hybrid reactor  

SciTech Connect

Two different superconducting coil systems for the SFLM Hybrid study - a quadrupolar mirror based fusion-fission reactor study - are presented. One coil system is for a magnetic field with 2 T at the midplane and a mirror ratio of four. This coil set consists of semiplanar coils in two layers. The alternative coil system is for a downscaled magnetic field of 1.25 T at the midplane and a mirror ratio of four, where a higher {beta} is required to achieve sufficient the neutron production. This coil set has one layer of twisted 3D coils. The 3D coils are expected to be considerably cheaper than the semiplanar, since NbTi superconductors can be used for most coils instead of Nb3Sn due to the lower magnetic field.

Hagnestal, A.; Agren, O.; Moiseenko, V. E. [Uppsala University, Angstroem laboratory, Division of Electricity, Box 534, SE-751 21 Uppsala (Sweden); Institute of Plasma Physics, National Science Center 'Kharkov Institute of Physics and Technology', Akademichna st. 1, 61108 Kharkiv (Ukraine)

2012-06-19T23:59:59.000Z

182

The Hybrid Solid Oxide Fuel Cell (SOFC) and Gas Turbine (GT) Systems Steady State Modeling  

E-Print Network (OSTI)

The Hybrid Solid Oxide Fuel Cell (SOFC) and Gas Turbine (GT) Systems Steady State Modeling Penyarat plants offer high cycle efficiencies. In this work a hybrid solid oxide fuel cell and gas turbine power, Gas turbine, Hybrid, Solid Oxide Fuel Cell hal-00703135,version1-31May2012 Author manuscript

Paris-Sud XI, Université de

183

Control System Development for an Advanced-Technology Medium-Duty Hybrid Electric Truck  

E-Print Network (OSTI)

03TB-45 Control System Development for an Advanced-Technology Medium-Duty Hybrid Electric Truck and vehicle test results for a medium-duty hybrid electric truck are reported in this paper. The design the benchmark vehicle. INTRODUCTION Hybrid powertrain is among the most visible transportation technology

Grizzle, Jessy W.

184

Kettlectric and myGen : portable, thermoelectric-based power generation systems for off-grid home use and the village entrepreneur  

E-Print Network (OSTI)

There are 1.6 billion people across the globe who still live without access to electricity. For this group, the modern electrical framework providing fundamental services for health, food and water processing and storage, ...

Kozlowski, Michael C. (Michael Charles)

2010-01-01T23:59:59.000Z

185

Evaluation of 2005 Honda Accord Hybrid Electric Drive System  

DOE Green Energy (OSTI)

The Hybrid Electric Vehicle (HEV) program officially began in 1993 as a five-year, cost-shared partnership between the U.S. Department of Energy (DOE) and American auto manufacturers: General Motors, Ford, and Daimler Chrysler. Currently, HEV research and development is conducted by DOE through its FreedomCAR and Vehicle Technologies (FCVT) program. The mission of the FCVT program is to develop more energy efficient and environmentally friendly highway transportation technologies. Program activities include research, development, demonstration, testing, technology validation, and technology transfer. These activities are aimed at developing technologies that can be domestically produced in a clean and cost-competitive manner. The vehicle systems technologies subprogram, which is one of four subprograms under the FCVT program, supports the efforts of the FreedomCAR through a three-phase approach [1] intended to: (1) Identify overall propulsion and vehicle-related needs by analyzing programmatic goals and reviewing industry's recommendations and requirements, then develop the appropriate technical targets for systems, subsystems, and component research and development activities; (2) Develop and validate individual subsystems and components, including electric motors, emission control devices, battery systems, power electronics, accessories, and devices to reduce parasitic losses; and (3) Determine how well the components and subassemblies work together in a vehicle environment or as a complete propulsion system and whether the efficiency and performance targets at the vehicle level have been achieved. The research performed under the vehicle systems subprogram will help remove technical and cost barriers to enable technology for use in such advanced vehicles as hybrid electric, plug-in electric, and fuel-cell-powered vehicles.

Staunton, R.H.; Burress, T.A.; Marlino, L.D.

2006-09-11T23:59:59.000Z

186

Design of novel hybrid controller for automatic generation control of hydrothermal system under open market scenario  

Science Conference Proceedings (OSTI)

This paper presents the analysis of Automatic generation control (AGC) of a two-area hydrothermal system under open market scenario by considering a novel hybrid controller which combines the principles of variable structure controller (VSC) and conventional ... Keywords: AGC, VSC, deregulated system, hybrid controller, hydrothermal system, open market system

C. Srinivasa Rao; S. Siva Nagaraju; P. Sangameswara Raju

2009-12-01T23:59:59.000Z

187

Hybrid System Design for Formations of Autonomous Vehicles  

E-Print Network (OSTI)

Cooperative control of multiple unmanned aerial vehicles (UAVs) poses significant theoretical and technical challenges. Recent advances in sensing, communication and computation enable the conduct of cooperative multiple-UAV missions deemed impossible in the recent past. We are interested in solving the Formation Reconfiguration Planning (FRP) problem which is focused on determining a nominal state and input trajectory for each vehicle such that the group can start from the given initial configuration and reach its given final configuration at the specified time while satisfying a set of given inter- and intra- vehicle constraints. Each solution of a FRP problem represents a distinct reconfiguration mode. When coupled with formation keeping modes, they can form a hybrid automaton of formation maneuvers in which a transition from one formation maneuver to another formation maneuver is governed by a finite automaton. This paper focuses on the implementation of the optimized hybrid system approach to formation reconfiguration for a group of 1 real and 3 virtual UAVs. Experimental results performed in the Richmond Field Station by using a helicopter-based Berkeley Aerial Robot are presented. 1

Shannon Zelinski; T. John Koo; Shankar Sastry

2003-01-01T23:59:59.000Z

188

Use of a hybrid technology in a critical security system.  

SciTech Connect

Assigning an acceptable level of power reliability in a security system environment requires a methodical approach to design when considering the alternatives tied to the reliability and life of the system. The downtime for a piece of equipment, be it for failure, routine maintenance, replacement, or refurbishment or connection of new equipment is a major factor in determining the reliability of the overall system. In addition to these factors is the condition where the system is static or dynamic in its growth. Most highly reliable security power source systems are supplied by utility power with uninterruptable power source (UPS) and generator backup. The combination of UPS and generator backup with a reliable utility typically provides full compliance to security requirements. In the energy market and from government agencies, there is growing pressure to utilize alternative sources of energy other than fossil fuel to increase the number of local generating systems to reduce dependence on remote generating stations and cut down on carbon effects to the environment. There are also conditions where a security system may be limited on functionality due to lack of utility power in remote locations. One alternative energy source is a renewable energy hybrid system including a photovoltaic or solar system with battery bank and backup generator set. This is a viable source of energy in the residential and commercial markets where energy management schemes can be incorporated and systems are monitored and maintained regularly. But, the reliability of this source could be considered diminished when considering the security system environment where stringent uptime requirements are required.

Scharmer, Carol; Trujillo, David J.

2010-08-01T23:59:59.000Z

189

Use of a hybrid technology in a critical security system.  

SciTech Connect

Assigning an acceptable level of power reliability in a security system environment requires a methodical approach to design when considering the alternatives tied to the reliability and life of the system. The downtime for a piece of equipment, be it for failure, routine maintenance, replacement, or refurbishment or connection of new equipment is a major factor in determining the reliability of the overall system. In addition to these factors is the condition where the system is static or dynamic in its growth. Most highly reliable security power source systems are supplied by utility power with uninterruptable power source (UPS) and generator backup. The combination of UPS and generator backup with a reliable utility typically provides full compliance to security requirements. In the energy market and from government agencies, there is growing pressure to utilize alternative sources of energy other than fossil fuel to increase the number of local generating systems to reduce dependence on remote generating stations and cut down on carbon effects to the environment. There are also conditions where a security system may be limited on functionality due to lack of utility power in remote locations. One alternative energy source is a renewable energy hybrid system including a photovoltaic or solar system with battery bank and backup generator set. This is a viable source of energy in the residential and commercial markets where energy management schemes can be incorporated and systems are monitored and maintained regularly. But, the reliability of this source could be considered diminished when considering the security system environment where stringent uptime requirements are required.

Trujillo, David J.

2010-10-01T23:59:59.000Z

190

Plug-In Hybrid Electric Vehicle Energy Storage System Design: Preprint  

DOE Green Energy (OSTI)

This paper discusses the design options for a plug-in hybrid electric vehicle, including power, energy, and operating strategy as they relate to the energy storage system.

Markel, T.; Simpson, A.

2006-05-01T23:59:59.000Z

191

Modeling of Solid Oxide Fuel Cell/Gas Turbine Hybrid Systems.  

E-Print Network (OSTI)

?? There is a growing interest in fuel cells for hybrid system. Fuel cells when combined with conventional turbine power plants offer high fuel efficiencies. (more)

Srivastava, Nischal

2006-01-01T23:59:59.000Z

192

Battery management system for Li-Ion batteries in hybrid electric vehicles.  

E-Print Network (OSTI)

??The Battery Management System (BMS) is the component responsible for the effcient and safe usage of a Hybrid Electric Vehicle (HEV) battery pack. Its main (more)

Marangoni, Giacomo

2010-01-01T23:59:59.000Z

193

Viability Of Hybrid Ground Source Heat Pump System With Solar Thermal Collectors.  

E-Print Network (OSTI)

??This thesis presents a study for examining the viability of hybrid ground source heat pump (GSHP) systems that use solar thermal collectors as the supplemental (more)

Rad, Farzin M.

2009-01-01T23:59:59.000Z

194

ENERGY MODELING OF A LEAD-ACID BATTERY WITHIN HYBRID WIND / PHOTOVOLTAIC SYSTEMS  

E-Print Network (OSTI)

ENERGY MODELING OF A LEAD-ACID BATTERY WITHIN HYBRID WIND / PHOTOVOLTAIC SYSTEMS O. GERGAUD, G Abstract: Within the scope of full-scale energy modeling of a hybrid wind / photovoltaic system coupled / photovoltaic production system coupled to the network grid (with energy storage) ENERGY MODELING OF A LEAD

Paris-Sud XI, Université de

195

Balanced reconfiguration of storage banks in a hybrid electrical energy storage system  

Science Conference Proceedings (OSTI)

Compared with the conventional homogeneous electrical energy storage (EES) systems, hybrid electrical energy storage (HEES) systems provide high output power and energy density as well as high power conversion efficiency and low self-discharge at a low ... Keywords: bank reconfiguration, hybrid electrical energy storage system

Younghyun Kim; Sangyoung Park; Yanzhi Wang; Qing Xie; Naehyuck Chang; Massimo Poncino; Massoud Pedram

2011-11-01T23:59:59.000Z

196

Timed Petri Nets in Hybrid Systems: Stability and SupervisoryControl  

Science Conference Proceedings (OSTI)

In this paper, timed Petri nets are used to model and control hybrid systems. Petri nets are used instead of finite automata primarily because of the advantages they offer in dealing with concurrency and complexity issues. A brief overview of existing results ... Keywords: hybrid systems, stability, supervisory control, switched systems, timed Petri nets

Xenofon D. Koutsoukos; Kevin X. He; Michael D. Lemmon; Panos J. Antsaklis

1998-06-01T23:59:59.000Z

197

Dynamic programming for constrained optimal control of discrete-time linear hybrid systems  

Science Conference Proceedings (OSTI)

In this paper we study the solution to optimal control problems for constrained discrete-time linear hybrid systems based on quadratic or linear performance criteria. The aim of the paper is twofold. First, we give basic theoretical results on the structure ... Keywords: Dynamic programming, Hybrid systems, Multiparametric programming, Optimal control, Piecewise affine systems

Francesco Borrelli; Mato Baoti?; Alberto Bemporad; Manfred Morari

2005-10-01T23:59:59.000Z

198

A novel hybrid AI system framework for crude oil price forecasting  

Science Conference Proceedings (OSTI)

In this study, a novel hybrid AI system framework is developed by means of a systematic integration of artificial neural networks (ANN) and rulebased expert system (RES) with web-based text mining (WTM) techniques. Within the hybrid AI system framework, ...

Shouyang Wang; Lean Yu; K. K. Lai

2004-07-01T23:59:59.000Z

199

Combining artificial neural networks and heuristic rules in a hybrid intelligent load forecast system  

Science Conference Proceedings (OSTI)

In this work, an Artificial Neural Network (ANN) is combined to Heuristic Rules producing a powerful hybrid intelligent system for short and mid-term electric load forecasting. The Heuristic Rules are used to adjust the ANN output to improve the system ... Keywords: artificial neural networks, electric load forecast, heuristic rules, hybrid system

Ronaldo R. B. de Aquino; Aida A. Ferreira; Manoel A. Carvalho, Jr.; Milde M. S. Lira; Geane B. Silva; Otoni Nbrega Neto

2006-09-01T23:59:59.000Z

200

Dynamic Modeling and Simulation of Hybrid Power Systems Based on Renewable Energy  

Science Conference Proceedings (OSTI)

This paper describes dynamic modeling and simulation results of a renewable energy based hybrid power system. The paper focuses on the combination of solar cell (SC), wind turbine (WT), fuel cell (FC) and ultra-capacitor (UC) systems for power generation. ... Keywords: fuel cell, hybrid power system, renewable energy, solar cell, ultra-capacitor, wind turbine

Teng-Fa Tsao; Po-Hung Chen; Hung-Cheng Chen

2009-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Control system and method for a hybrid electric vehicle  

DOE Patents (OSTI)

A vehicle system controller (20) is presented for a LSR parallel hybrid electric vehicle having an engine (10), a motor (12), wheels (14), a transmission (16) and a battery (18). The vehicle system controller (20) has a state machine having a plurality of predefined states (22-32) that represent operating modes for the vehicle. A set of rules is defined for controlling the transition between any two states in the state machine. The states (22-32) are prioritized according to driver demands, energy management concerns and system fault occurrences. The vehicle system controller (20) controls the transitions from a lower priority state to a higher priority state based on the set of rules. In addition, the vehicle system controller (20) will control a transition to a lower state from a higher state when the conditions no longer warrant staying in the current state. A unique set of output commands is defined for each state for the purpose of controlling lower level subsystem controllers. These commands serve to achieve the desire vehicle functionality within each state and insure smooth transitions between states.

Phillips, Anthony Mark (Northville, MI); Blankenship, John Richard (Dearborn, MI); Bailey, Kathleen Ellen (Dearborn, MI); Jankovic, Miroslava (Birmingham, MI)

2001-01-01T23:59:59.000Z

202

A novel hybrid (wind-photovoltaic) system sizing procedure  

SciTech Connect

Wind-photovoltaic hybrid system (WPHS) utilization is becoming popular due to increasing energy costs and decreasing prices of turbines and photovoltaic (PV) panels. However, prior to construction of a renewable generation station, it is necessary to determine the optimum number of PV panels and wind turbines for minimal cost during continuity of generated energy to meet the desired consumption. In fact, the traditional sizing procedures find optimum number of the PV modules and wind turbines subject to minimum cost. However, the optimum battery capacity is either not taken into account, or it is found by a full search between all probable solution spaces which requires extensive computation. In this study, a novel description of the production/consumption phenomenon is proposed, and a new sizing procedure is developed. Using this procedure, optimum battery capacity, together with optimum number of PV modules and wind turbines subject to minimum cost can be obtained with good accuracy. (author)

Hocaoglu, Fatih O. [Afyon Kocatepe University, Dept. of Electronics and Communication Eng., 03200 Afyonkarahisar (Turkey); Gerek, Oemer N.; Kurban, Mehmet [Anadolu University, Dept. of Electrical and Electronics Eng., 26555 Eskisehir (Turkey)

2009-11-15T23:59:59.000Z

203

Hybrid vehicle system studies and optimized hydrogen engine design  

DOE Green Energy (OSTI)

We have done system studies of series hydrogen hybrid automobiles that approach the PNGV design goal of 34 km/liter (80 mpg), for 384 km (240 mi) and 608 km (380 mi) ranges. Our results indicate that such a vehicle appears feasible using an optimized hydrogen engine. We have evaluated the impact of various on-board storage options on fuel economy. Experiments in an available engine at the Sandia CRF demonstrated NO{sub x} emissions of 10 to 20 ppM at an equivalence ratio of 0.4, rising to about 500 ppm at 0.5 equivalence ratio using neat hydrogen. Hybrid simulation studies indicate that exhaust NO{sub x} concentrations must be less than 180 ppM to meet the 0.2 g/mile ULEV or Federal Tier II emissions regulations. LLNL has designed and fabricated a first generation optimized hydrogen engine head for use on an existing Onan engine. This head features 15:1 compression ratio, dual ignition, water cooling, two valves and open quiescent combustion chamber to minimize heat transfer losses. Initial testing shows promise of achieving an indicated efficiency of nearly 50% and emissions of less than 100 ppM NO{sub x}. Hydrocarbons and CO are to be measured, but are expected to be very low since their only source is engine lubricating oil. A successful friction reduction program on the Onan engine should result in a brake thermal efficiency of about 42% compared to today`s gasoline engines of 32%. Based on system studies requirements, the next generation engine will be about 2 liter displacement and is projected to achieve 46% brake thermal efficiency with outputs of 15 kW for cruise and 40 kW for hill climb.

Smith, J.R.; Aceves, S.

1995-04-26T23:59:59.000Z

204

Hybrid-drive implosion system for ICF targets  

DOE Patents (OSTI)

Hybrid-drive implosion systems (20,40) for ICF targets (10,22,42) are described which permit a significant increase in target gain at fixed total driver energy. The ICF target is compressed in two phases, an initial compression phase and a final peak power phase, with each phase driven by a separate, optimized driver. The targets comprise a hollow spherical ablator (12) surroundingly disposed around fusion fuel (14). The ablator is first compressed to higher density by a laser system (24), or by an ion beam system (44), that in each case is optimized for this initial phase of compression of the target. Then, following compression of the ablator, energy is directly delivered into the compressed ablator by an ion beam driver system (30,48) that is optimized for this second phase of operation of the target. The fusion fuel (14) is driven, at high gain, to conditions wherein fusion reactions occur. This phase separation allows hydrodynamic efficiency and energy deposition uniformity to be individually optimized, thereby securing significant advantages in energy gain. In additional embodiments, the same or separate drivers supply energy for ICF target implosion.

Mark, James W. (Danville, CA)

1988-01-01T23:59:59.000Z

205

Hybrid-drive implosion system for ICF targets  

DOE Patents (OSTI)

Hybrid-drive implosion systems for ICF targets are described which permit a significant increase in target gain at fixed total driver energy. The ICF target is compressed in two phases, an initial compression phase and a final peak power phase, with each phase driven by a separate, optimized driver. The targets comprise a hollow spherical ablator surroundingly disposed around fusion fuel. The ablator is first compressed to higher density by a laser system, or by an ion beam system, that in each case is optimized for this initial phase of compression of the target. Then, following compression of the ablator, energy is directly delivered into the compressed ablator by an ion beam driver system that is optimized for this second phase of operation of the target. The fusion fuel is driven, at high gain, to conditions wherein fusion reactions occur. This phase separation allows hydrodynamic efficiency and energy deposition uniformity to be individually optimized, thereby securing significant advantages in energy gain. In additional embodiments, the same or separate drivers supply energy for ICF target implosion. 3 figs.

Mark, J.W.K.

1987-10-14T23:59:59.000Z

206

Control and supervision of a complex production process using hybrid systems techniques  

Science Conference Proceedings (OSTI)

New processing activities for the decommissioning of the Experimental Breeder Reactor II are being carried out at Argonne National Laboratory. The task addressed in this paper is a process to convert metallic sodium to sodium carbonate. The main idea ... Keywords: Argonne National Laboratory, Experimental Breeder Reactor II, complex production process supervision, fission reactor core control, fission research reactors, hybrid control solution, hybrid system techniques, hybrid systems techniques, metallic sodium, nuclear engineering computing, sodium carbonate

H. E. Garcia

1995-11-01T23:59:59.000Z

207

Analysis of a diesel-electric hybrid urban bus system  

DOE Green Energy (OSTI)

A hybrid bus powered by a diesel engine and a battery pack has been analyzed over an idealized bus-driving cycle in Chicago. Three hybrid configurations, two parallel and one series, have been evaluated. The results indicate that the fuel economy of a hybrid bus, taking into account the regenerative braking, is comparable with that of a conventional diesel bus. Life-cycle costs are slightly higher because of the added weight and cost of the battery.

Marr, W.W.; Sekar, R.R. [Argonne National Lab., IL (United States); Ahlheim, M.C. [Regional Transportation Authority, Chicago, IL (United States)

1993-08-01T23:59:59.000Z

208

Illuminating the Pecking Order in Off-Grid Lighting: A Demonstration of LED Lighting for Saving Energy in the Poultry Sector  

E-Print Network (OSTI)

each of the three systems. Lighting System Kerosene Solar-opened and all available lighting points in usewe measuredin comparison to the other lighting systems. There is

Tracy, Jennifer

2012-01-01T23:59:59.000Z

209

An Ultracapacitor - Battery Energy Storage System for Hybrid Electric Vehicles.  

E-Print Network (OSTI)

??The nickel metal hydride (NiMH) batteries used in most hybrid electric vehicles (HEVs) provide satisfactory performance but are quite expensive. In spite of their lower (more)

Stienecker, Adam W

2005-01-01T23:59:59.000Z

210

Advancements of the Hybrid Method UF6 Container Inspection System  

Science Conference Proceedings (OSTI)

Safeguards inspectors currently visit uranium enrichment plants to verify UF6 cylinder enrichment declarations. Measurements are performed with handheld high-resolution detectors on a limited number of cylinders taken to be representative of the plants cylinder inventory. These enrichment assay methods interrogate only a small fraction of the total cylinder volume, and are time-consuming and expensive to execute. Pacific Northwest National Laboratory (PNNL) is developing an automated UF6 cylinder verification station concept based on the combined collection of traditional enrichment-meter data (186 keV photons from 235U) and non-traditional, neutron-induced, high-energy gamma-ray signatures (3-8 MeV) with an array of collimated, medium-resolution scintillators. Previous work at PNNL (2010) demonstrated proof-of-principle that this hybrid method yields accurate, full-volume assay of the cylinder enrichment, reduces systematic errors when compared to several other enrichment assay methods, and provides simplified instrumentation and algorithms suitable for long-term, unattended operations. This system aims to increase the number of inspected cylinders at higher accuracy and with lower cost than when compared to inspectors with hand-held instruments. Several measurement campaigns of 30B cylinder populations and a refined MCNP model will be reported. The MCNP model consists of per-gram basis vectors for the different uranium isotopes and several fill geometries, enabling fast generation of any UF6 enrichment level and multiple configurations. The refined model was used to optimize collimator design and detector configuration for the hybrid method. In addition, a new field prototype based on model results was utilized in a set of field measurements.

Mace, Emily K.; Orton, Christopher R.; Jordan, David V.; McDonald, Benjamin S.; Smith, Leon E.

2011-07-17T23:59:59.000Z

211

Combined cycle solar central receiver hybrid power system study. Volume III. Appendices. Final technical report  

DOE Green Energy (OSTI)

A design study for a 100 MW gas turbine/steam turbine combined cycle solar/fossil-fuel hybrid power plant is presented. This volume contains the appendices: (a) preconceptual design data; (b) market potential analysis methodology; (c) parametric analysis methodology; (d) EPGS systems description; (e) commercial-scale solar hybrid power system assessment; and (f) conceptual design data lists. (WHK)

None

1979-11-01T23:59:59.000Z

212

STATE ESTIMATION OF SOFC/GT HYBRID SYSTEM USING UKF Rambabu Kandepu*, 1  

E-Print Network (OSTI)

STATE ESTIMATION OF SOFC/GT HYBRID SYSTEM USING UKF Rambabu Kandepu*, 1 , Biao Huang** , Bjarne.Imsland@sintef.no Abstract: A description of a Solid Oxide Fuel Cell (SOFC) combined Gas Turbine (GT) hybrid system is given reliability. One of the most promising fuel cell technologies is the Solid Oxide Fuel Cell (SOFC), due to its

Foss, Bjarne A.

213

Feasibility of a hybrid cooling system in a thermal power plant  

Science Conference Proceedings (OSTI)

The feasibility of introducing a hybrid cooling system in a thermal power plant is investigated with an aim to reduce water use with a minimum impact on plant performance. A number of cooling systems have been modelled including existing evaporative ... Keywords: cooling, hybrid cooling, power station, sustainable water consumption

C. R. Williams; M. G. Rasul

2008-02-01T23:59:59.000Z

214

Simultaneous fault and mode switching identification for hybrid systems based on particle swarm optimization  

Science Conference Proceedings (OSTI)

This paper describes a methodology for simultaneous identification of fault parameters and mode switching events for hybrid systems. The method is developed based on the notion of Global Analytical Redundancy Relations (GARRs) from the bond graph model ... Keywords: Bond graph, Fault parameter, Global analytical redundancy relation, Hybrid system, Mode switching time stamps, Particle swarm optimization

Ming Yu; Ming Luo; Danwei Wang; Shai Arogeti; Xinzheng Zhang

2010-04-01T23:59:59.000Z

215

State of health aware charge management in hybrid electrical energy storage systems  

Science Conference Proceedings (OSTI)

This paper is the first to present an efficient charge management algorithm focusing on extending the cycle life of battery elements in hybrid electrical energy storage (HEES) systems while simultaneously improving the overall cycle efficiency. In particular, ... Keywords: charge management, hybrid electrical energy storage system, state of health

Qing Xie; Xue Lin; Yanzhi Wang; Massoud Pedram; Donghwa Shin; Naehyuck Chang

2012-03-01T23:59:59.000Z

216

Electrically heated particulate filter regeneration methods and systems for hybrid vehicles  

DOE Patents (OSTI)

A control system for controlling regeneration of a particulate filter for a hybrid vehicle is provided. The system generally includes a regeneration module that controls current to the particulate filter to initiate regeneration. An engine control module controls operation of an engine of the hybrid vehicle based on the control of the current to the particulate filter.

Gonze, Eugene V. (Pinckney, MI); Paratore, Jr., Michael J. (Howell, MI)

2010-10-12T23:59:59.000Z

217

Dynamic Reconfiguration of Photovoltaic Energy Harvesting System in Hybrid Electric Vehicles  

E-Print Network (OSTI)

Dynamic Reconfiguration of Photovoltaic Energy Harvesting System in Hybrid Electric Vehicles Yanzhi, xuelin, pedram}@usc.edu, 2 {naehyuck}@elpl.snu.ac.kr ABSTRACT Photovoltaic (PV) energy harvesting system is a promising energy source for battery replenishment in hybrid electric vehicles (HEVs.) The PV cell array

Pedram, Massoud

218

Dynamic reconfiguration of photovoltaic energy harvesting system in hybrid electric vehicles  

Science Conference Proceedings (OSTI)

Photovoltaic (PV) energy harvesting system is a promising energy source for battery replenishment in hybrid electric vehicles (HEVs.) The PV cell array is installed on different parts of a vehicle body such as the engine hood, door panels, and the roof ... Keywords: dynamic programming., hybrid electric vehicle, photovoltaic array reconfiguration, photovoltaic system

Yanzhi Wang; Xue Lin; Naehyuck Chang; Massoud Pedram

2012-07-01T23:59:59.000Z

219

Study of Operating Control Strategies for Hybrid Ground Source Heat Pump System with Supplemental Cooling Tower  

Science Conference Proceedings (OSTI)

Ground source heat pump for cooling-dominated commercial buildings may utilize supplemental cooling towers to reduce system first cost and to improve system performance. The use of hybrid ground source heat pump (HGSP) can reduce the size of the ground-loop ... Keywords: hybrid ground source heat pump, supplement heat rejection, control strategies, operating performance

Wang Jinggang; Gao Xiaoxia; Yin Zhenjiang; Li Fang

2009-07-01T23:59:59.000Z

220

A hybrid simulation-adaptive network based fuzzy inference system for improvement of electricity consumption estimation  

Science Conference Proceedings (OSTI)

This paper presents a hybrid adaptive network based fuzzy inference system (ANFIS), computer simulation and time series algorithm to estimate and predict electricity consumption estimation. The difficulty with electricity consumption estimation modeling ... Keywords: Adaptive network based fuzzy inference system, Computer simulation, Electricity consumption, Hybrid, Improvement, Time series

A. Azadeh; M. Saberi; A. Gitiforouz; Z. Saberi

2009-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Development of a Hardware-in-the-loop Simulation System for Hybrid Electric Vehicle Performance Test  

Science Conference Proceedings (OSTI)

In order to facilitate control strategy development and performance test of hybrid electric vehicle, a hardware-in-the-loop simulation system is developed. The system is constructed with LabVIEW and PXI hardware. Hardware-in-the-loop simulation test ... Keywords: hybrid electric vehicle, hardware-in-the-loop simulation, fuel economy, exhaust emission

Yanyi Zhang, Zhenhua Jin, Haoduan Wang, Qingchun Lu

2012-07-01T23:59:59.000Z

222

Energy Management System for an Hybrid Electric Vehicle, Using Ultracapacitors and Neural Networks  

E-Print Network (OSTI)

Energy Management System for an Hybrid Electric Vehicle, Using Ultracapacitors and Neural Networks management system for hybrid electric vehicles (HEV), using neural networks (NN), was developed and tested, similar in shape and size to a Chevrolet S-10, which was converted to an electric vehicle

Rudnick, Hugh

223

A methodology for optimal sizing of autonomous hybrid PV/wind system  

E-Print Network (OSTI)

system reliability requirements, with the lowest value of levelised cost of energy. Modelling a hybrid PV mathematical models for characterizing PV module, wind generator and battery are proposed. The second step of the hybrid PV/wind system are the reliable power supply of the consumer under varying atmospheric conditions

Paris-Sud XI, Université de

224

The economics of hybrid manufacturing systems in a closed-loop supply chain  

Science Conference Proceedings (OSTI)

This paper deals with the economics of a closed-loop supply chain and the decision-making in a hybrid manufacturing system. We develop analytic models and quantify the potential profits gain generated by such a hybrid system that collects, remanufactures, ... Keywords: Closed-loop supply chain, Competition, Newsvendor, Remanufacturing, Reverse logistics

Jen-Ming Chen; Chia-I Chang

2012-07-01T23:59:59.000Z

225

Evaluation of 2004 Toyota Prius Hybrid Electric Drive System  

SciTech Connect

The 2004 Toyota Prius is a hybrid automobile equipped with a gasoline engine and a battery- and generator-powered electric motor. Both of these motive-power sources are capable of providing mechanical-drive power for the vehicle. The engine can deliver a peak-power output of 57 kilowatts (kW) at 5000 revolutions per minute (rpm) while the motor can deliver a peak-power output of 50 kW over the speed range of 1200-1540 rpm. Together, this engine-motor combination has a specified peak-power output of 82 kW at a vehicle speed of 85 kilometers per hour (km/h). In operation, the 2004 Prius exhibits superior fuel economy compared to conventionally powered automobiles. To acquire knowledge and thereby improve understanding of the propulsion technology used in the 2004 Prius, a full range of design characterization studies were conducted to evaluate the electrical and mechanical characteristics of the 2004 Prius and its hybrid electric drive system. These characterization studies included (1) a design review, (2) a packaging and fabrication assessment, (3) bench-top electrical tests, (4) back-electromotive force (emf) and locked rotor tests, (5) loss tests, (6) thermal tests at elevated temperatures, and most recently (7) full-design-range performance testing in a controlled laboratory environment. This final test effectively mapped the electrical and thermal results for motor/inverter operation over the full range of speeds and shaft loads that these assemblies are designed for in the Prius vehicle operations. This testing was undertaken by the Oak Ridge National Laboratory (ORNL) as part of the U.S. Department of Energy (DOE) - Energy Efficiency and Renewable Energy (EERE) FreedomCAR and Vehicle Technologies (FCVT) program through its vehicle systems technologies subprogram. The thermal tests at elevated temperatures were conducted late in 2004, and this report does not discuss this testing in detail. The thermal tests explored the derating of the Prius motor design if operated at temperatures as high as is normally encountered in a vehicle engine. The continuous ratings at base speed (1200 rpm) with different coolant temperatures are projected from test data at 900 rpm. A separate, comprehensive report on this thermal control study is available [1].

Staunton, Robert H [ORNL; Ayers, Curtis William [ORNL; Chiasson, J. N. [University of Tennessee, Knoxville (UTK); Burress, Timothy A [ORNL; Marlino, Laura D [ORNL

2006-05-01T23:59:59.000Z

226

Evaluation of 2004 Toyota Prius Hybrid Electric Drive System  

SciTech Connect

The 2004 Toyota Prius is a hybrid automobile equipped with a gasoline engine and a battery- and generator-powered electric motor. Both of these motive-power sources are capable of providing mechanical-drive power for the vehicle. The engine can deliver a peak-power output of 57 kilowatts (kW) at 5000 revolutions per minute (rpm) while the motor can deliver a peak-power output of 50 kW over the speed range of 1200-1540 rpm. Together, this engine-motor combination has a specified peak-power output of 82 kW at a vehicle speed of 85 kilometers per hour (km/h). In operation, the 2004 Prius exhibits superior fuel economy compared to conventionally powered automobiles. To acquire knowledge and thereby improve understanding of the propulsion technology used in the 2004 Prius, a full range of design characterization studies were conducted to evaluate the electrical and mechanical characteristics of the 2004 Prius and its hybrid electric drive system. These characterization studies included (1) a design review, (2) a packaging and fabrication assessment, (3) bench-top electrical tests, (4) back-electromotive force (emf) and locked rotor tests, (5) loss tests, (6) thermal tests at elevated temperatures, and most recently (7) full-design-range performance testing in a controlled laboratory environment. This final test effectively mapped the electrical and thermal results for motor/inverter operation over the full range of speeds and shaft loads that these assemblies are designed for in the Prius vehicle operations. This testing was undertaken by the Oak Ridge National Laboratory (ORNL) as part of the U.S. Department of Energy (DOE)-Energy Efficiency and Renewable Energy (EERE) FreedomCAR and Vehicle Technologies (FCVT) program through its vehicle systems technologies subprogram. The thermal tests at elevated temperatures were conducted late in 2004, and this report does not discuss this testing in detail. The thermal tests explored the derating of the Prius motor design if operated at temperatures as high as is normally encountered in a vehicle engine. The continuous ratings at base speed (1200 rpm) with different coolant temperatures are projected from test data at 900 rpm. A separate, comprehensive report on this thermal control study is available [1].

Staunton, R.H.; Ayers, C.W.; Chiasson, J.N. (U Tennessee-Knoxville); Burress, B.A. (ORISE); Marlino, L.D.

2006-05-01T23:59:59.000Z

227

STATEMENT OF CONSIDERATIONS REQUEST BY HYBRID POWER GENERATION SYSTEMS, LLC, FOR AN ADVANCE  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

AN ADVANCE AN ADVANCE WAIVER OF DOMESTIC AND FOREIGN INVENTION RIGHTS UNDER DOE COOPERATIVE AGREEMENT NO. DE-FC26-01NT40779; W(A)-03-015, CH-1142 The Petitioner, Hybrid Power Generation Systems, LLC, a wholly owned subsidiary of General Electric Company (GE HPGS), was awarded this cooperative agreement for the performance of work entitled, "Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation". The purpose of the cooperative agreement is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a turbogenerator. The proposed hybrid system is based on planar SOFC and turbogenerator power technologies. The focus of this work is to test a sub-scale SOFC and turbocharger hybrid

228

ROBUST CONTROL ANALYSIS USING REAL-TIME IMPLEMENTATION OF A HYBRID FUEL CELL POWER GENERATION SYSTEM  

E-Print Network (OSTI)

is performed for a hybrid Fuel Cell/Supercapacitor generation system with power management, realized through converters interfacing the Fuel Cell (FC) and the Supercapacitor (SC) with the system electrical load

Paris-Sud XI, Université de

229

Illuminating the Pecking Order in Off-Grid Lighting: A Demonstration of LED Lighting for Saving Energy in the Poultry Sector  

E-Print Network (OSTI)

Fluorescent Solar Portable LED Capital Cost (Ksh) Capital4. Fluorescent house. Figure 5. LED house. When the chickensgrowth rates. However, the LED system produced the most

Tracy, Jennifer

2012-01-01T23:59:59.000Z

230

Nuclear Hybrid Energy Systems: Imperatives, Prospects, and Challenges  

Science Conference Proceedings (OSTI)

As global population reaches an expected 8 billion people by 2030, primary energy consumption is expected to increase by almost 40% from approximately 520 exajoules consumed today to almost 740 exajoules. Much of this increase is expected to come from non-Organization for Economic Cooperation and Development (OECD) nations, and Asia specifically. In these economies, energy used for transportation is expected to grow substantially, as is industrial, commercial and to a lesser degree residential energy use, creating considerable pressure on global and local energy markets. The magnitude and timing of growth in energy consumption likely will create a global imperative to deploy energy production technologies that balance the three pillars of energy security: economic stability related to the affordability of energy products, stability and predictability in their price, and the efficient and effective deployment of global capital resources in their development; environmental sustainability related to minimizing the negative impacts of energy production to air, land, and water systems and advancing the long-term viability of using a particular resource in a way that does not limit future generations ability to prosper; resource security related to the ability to access energy resources and products where and when necessary, in an affordable and predictable manner. One approach to meeting these objectives is hybrid energy systems (HES). Broadly described, HES are energy product production plants that take two or more energy resource inputs (typically includes both carbon and non-carbon based sources) and produce two or more energy products (e.g. electricity, liquid transportation fuels, industrial chemicals) in an integrated plant. Nuclear energy integration into HES offers intriguing potential, particularly if smaller (management (e.g. advanced heat exchangers, process design); energy storage (e.g. H2 production, liquid fuels synthesis); byproduct management (e.g. CO2 recycle approaches); systems dynamics, integration and control (e.g. process dynamics analyses and optimization, advanced prognostics, diagnostics, variable time scale control and flow sheet optimization).

Steven E. Aumeier

2010-10-01T23:59:59.000Z

231

Simulation of electric vehicles with hybrid power systems  

SciTech Connect

Computer programs for the simulation of the operation of electric vehicles with hybrid power systems are described. These programs treat cases in which high energy density ultracapacitors or high power density pulse batteries are used to load level the main energy storage battery in the vehicle. A generalized control strategy for splitting the power between the main battery and the pulse power devices is implemented such that the user can specify the nominal battery power as a function of the state-of-charge of the ultracapacitor or pulse power battery. The programs display graphically on the screen, as they run, the power from both the main battery and the pulse power device and the state-of-charge of the pulse power device. After each run is completed, a summary is printed out from which the effect of load leveling the battery on vehicle range and energy consumption can be determined. Default input files are provided with the programs so various combinations of vehicles, driveline components, and batteries of special current interest to the EV community can be run with either type of pulse power device. Typical simulation results are shown including cases in which the pulse power devices are connected in parallel with the main battery without interface electronics. 2 refs., 7 figs., 14 tabs.

Burke, A.F.; Cole, G.H.

1990-01-01T23:59:59.000Z

232

Small-Signal Analysis of Hybrid Distributed Generation System with HVDC-Link and Energy Storage Elements  

Science Conference Proceedings (OSTI)

A small-signal analysis of isolated autonomous hybrid system with high voltage direct current link (HVDC) or high voltage alternating current (HVAC) line for different energy storage combinations is proposed in this paper. The hybrid systems supplying ...

P. K. Ray; S. R. Mohanty; Nand Kishor; A. Mohanty

2009-12-01T23:59:59.000Z

233

Electric and Hybrid Vehicle System Research and Development Project: Hybrid Vehicle Potential Assessment. Volume VIII. Scenario generation  

SciTech Connect

Scenarios are described which have been generated in support of the Hybrid Vehicle Potential Assessment Task under the JPL Electric and Hybrid Vehicle Systems Research and Development Project. The primary function of the scenario generation is to develop a set of consistent and credible forecasts required to estimate the potential impact of hybrid vehicles on future petroleum consumption in the USA, given a set of specific electric, hybrid and conventional vehicle designs. The forecasts are limited to the next 32 years (1978 to 2010. The four major areas of concern are: population and vehicle fleet size; travel patterns and vehicle fleet mix; conventional vehicle technology (Otto baseline); battery technology; and prices. The forecasts have been generated to reflect two baseline scenarios, a Petroleum Conservation Scenario (Scenario A) and an Energy Conservation Scenario (Scenario B). The primary assumption in Scenario A is higher gasoline prices than in Scenario B. This should result in less travel per car and an increased demand for smaller and more fuel efficient cars (compared to Scenario B). In Scenario B the primary assumption is higher prices on cars (new as well as used) than in Scenario A. This should lead to less cars (compared to Scenario A) and a shift to other modes of transportation.

Leschly, K.O.

1979-09-30T23:59:59.000Z

234

Nuclear Hybrid Energy Systems: Imperatives, Prospects, and Challenges  

DOE Green Energy (OSTI)

As global population reaches an expected 8 billion people by 2030, primary energy consumption is expected to increase by almost 40% from approximately 520 exajoules consumed today to almost 740 exajoules. Much of this increase is expected to come from non-Organization for Economic Cooperation and Development (OECD) nations, and Asia specifically. In these economies, energy used for transportation is expected to grow substantially, as is industrial, commercial and to a lesser degree residential energy use, creating considerable pressure on global and local energy markets. The magnitude and timing of growth in energy consumption likely will create a global imperative to deploy energy production technologies that balance the three pillars of energy security: economic stability related to the affordability of energy products, stability and predictability in their price, and the efficient and effective deployment of global capital resources in their development; environmental sustainability related to minimizing the negative impacts of energy production to air, land, and water systems and advancing the long-term viability of using a particular resource in a way that does not limit future generations ability to prosper; resource security related to the ability to access energy resources and products where and when necessary, in an affordable and predictable manner. One approach to meeting these objectives is hybrid energy systems (HES). Broadly described, HES are energy product production plants that take two or more energy resource inputs (typically includes both carbon and non-carbon based sources) and produce two or more energy products (e.g. electricity, liquid transportation fuels, industrial chemicals) in an integrated plant. Nuclear energy integration into HES offers intriguing potential, particularly if smaller (<300 MWe) reactors are available. Although the concept of using nuclear energy in a variety of non-electrical process applications is certainly not new, renewed interest in more tightly coupled energy product plants (such as HES) that meet the objectives outline above have gained additional interest recently, an interest likely sparked by sharpening energy security concerns. Studies have shown that non-nuclear integrated (hybrid) energy systems can have appealing attributes in terms of overall process efficiency, enhanced electric grid stability, renewable energy integration, and economic performance, and lifecycle greenhouse gas emissions. These attributes seem to be sufficiently compelling that several significant commercial investments in fossil-renewable HES are being made in the United States while the U.S. Defense Advanced Research Projects Agency (DARPA) has openly solicited information regarding nuclear energy integration schemes. The challenges of nuclear energy integration include myriad issues associated with the following RD&D areas, or platforms: feedstock processing (e.g. bio-feedstock integration with coal, carbon feedstock extraction using nuclear energy); heat / energy management (e.g. advanced heat exchangers, process design); energy storage (e.g. H2 production, liquid fuels synthesis); byproduct management (e.g. CO2 recycle approaches); systems dynamics, integration and control (e.g. process dynamics analyses and optimization, advanced prognostics, diagnostics, variable time scale control and flow sheet optimization).

Steven E. Aumeier

2010-10-01T23:59:59.000Z

235

Evaluation of a Lower-Energy Energy Storage System (LEESS) for Full-Hybrid Electric Vehicles (HEVs) (Presentation)  

DOE Green Energy (OSTI)

This presentation discusses the evaluation of a lower-energy energy storage system for full-hybrid electric vehicles.

Gonder, J.; Ireland, J.; Cosgrove, J.

2013-04-01T23:59:59.000Z

236

Autonomous induction generator/rectifier as regulated DC power supply for hybrid renewable energy systems  

Science Conference Proceedings (OSTI)

The present article deals with the wind power-generating unit of a Hybrid Photovoltaic-Wind Renewable Energy System (HPVWRES). The dynamic flux model of the self-excited induction generator used in the wind power-generating unit is given. This model, ... Keywords: experimental investigation, hybrid, induction generator, modeling, rectifier, regulation, renewable Energy

A. Nesba; R. Ibtiouen; S. Mekhtoub; O. Touhami; N. Takorabet

2005-10-01T23:59:59.000Z

237

Study on a hybrid fuzzy-PI controller applied to VSC-HVDC system  

Science Conference Proceedings (OSTI)

A hybrid fuzzy-PI controller for voltage source converter based HYDC (VSC-HVDC) transmission system is proposed in this paper. At first, the elementary model of VSC-HYDC is described. Then the fuzzy self-tuning control strategy is proposed, in which ... Keywords: HVDC, VSC, direct current control, hybrid fuzzy-PI control

Geng Yuancheng; Li Zhixiong; Zhang Jiangcheng

2010-03-01T23:59:59.000Z

238

Performance Study on Multilevel Hybrid Power System of Pneumatic-fuel Vehicle  

Science Conference Proceedings (OSTI)

Put forward the concept of multilevel hybrid power system of pneumatic-Fuel Vehicle, composed of the gasoline engine and pneumatic motor which is droved by the admixture of compressed air and engine exhaust gas so as to improve the dynamics. The dynamics ... Keywords: fuel-pneumatic, multilevel hybrid power vehicle, dynamics, fuel consumption

Wang Guo-ye; Zhang Juan-li; Chou Xiao-gang; Wang Jun; Zheng Chang-song

2011-01-01T23:59:59.000Z

239

Study on Regenerative Brake Method of Hybrid Electric Drive System of Armored Vehicle  

Science Conference Proceedings (OSTI)

Aiming at characteristics of regenerative brake of hybrid electric drive system of tracked armored vehicle, mechanism of regenerative brake by pulse width modulation is in-depth analyzed, motor speed, brake current, feedback current, feedback energy ... Keywords: hybrid electric drive, motor, regenerative brake

Li Hua; Zhong Meng-chun; Zhang Jian; Xu Da; Lin Hai

2011-10-01T23:59:59.000Z

240

A survey-based type-2 fuzzy logic system for energy management in hybrid electrical vehicles  

Science Conference Proceedings (OSTI)

Hybrid electrical vehicles combine two or more energy sources (at least one electrical) to benefit from their different characteristics regarding autonomy, reversibility and dynamic response. Energy management consists in discovering an energy distribution ... Keywords: Energy management, Group decision making, Hybrid electrical vehicles, Linguistic modelling, Survey-based fuzzy logic systems, Type-2 fuzzy sets

Javier Solano Martnez; Robert I. John; Daniel Hissel; Marie-Ccile Pra

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Optimal Energy Management for a Hybrid Energy Storage System for Electric Vehicles Based on  

E-Print Network (OSTI)

}@lea.uni-paderborn.de Abstract--For electric and hybrid electric cars, commonly nickel-metal hydride and lithium-ion batteries. The BMW Mini-E is an all electric powered car field-tested in the United States, United KingdomOptimal Energy Management for a Hybrid Energy Storage System for Electric Vehicles Based

Noé, Reinhold

242

Design of Electric or Hybrid vehicle alert sound system for pedestrian  

E-Print Network (OSTI)

on a track of our test center located in La Ferté Vidame. Two cars were used: -a diesel-vehicle - an electricDesign of Electric or Hybrid vehicle alert sound system for pedestrian J.-C. Chamard and V, France 1691 #12;The arrival of fully or hybrid electric vehicles raised safety problems respect

Paris-Sud XI, Université de

243

Modeling and Simulation of a Microgrid as a Stochastic Hybrid System  

E-Print Network (OSTI)

1 Modeling and Simulation of a Microgrid as a Stochastic Hybrid System Martin Strelec, Karel Macek, Alessandro Abate Abstract--Microgrids (MGs) are small-scale local energy grids. While dedicated to cover and on approximate dynamic programming) for typical challenges in MGs. Index Terms--Microgrids, Stochastic Hybrid

Abate, Alessandro

244

Techno-economics analysis of a wind/PV hybrid system to provide electricity for a household in Malaysia  

Science Conference Proceedings (OSTI)

This paper is study on techno-economics analysis of a wind/PV hybrid system for a household in Malaysia. One year recorded wind speed and solar radiation are used for the design of a hybrid energy system. In 2004 average annual wind speed in Kuala Terengganu ... Keywords: electrical load, techno-economics analysis, wind/PV hybrid system

Ahmad Fudholi; Mohd Zamri Ibrahim; Mohd Hafidz Ruslan; Lim Chin Haw; Sohif Mat; Mohd Yusof Othman; Azami Zaharim; Kamaruzzaman Sopian

2012-01-01T23:59:59.000Z

245

Technical Description and Evaluation of BWR Hybrid Power Shape Monitoring System  

Science Conference Proceedings (OSTI)

This report discusses the method of monitoring BWR cores that has been implemented in the Power Shape Monitoring System (PSMS). A complete technical description of the hybrid PSMS and the results of detailed qualification testing are included.

1982-03-01T23:59:59.000Z

246

Facility location for a hybrid manufacturing/remanufacturing system with carbon costs.  

E-Print Network (OSTI)

??This thesis addresses inventory management and facility location for a hybrid manufacturing/remanufacturing system where remanufacturing lead-time is different from production lead-time. We also investigate the (more)

Kim, Yusuk

2013-01-01T23:59:59.000Z

247

Multi-Objective Capacity Planning of a Pv-Wind-Diesel-Battery Hybrid Power System  

E-Print Network (OSTI)

A new solution methodology of the capacity design problem of a PV-Wind-Diesel-Battery Hybrid Power System (HPS) is presented. The problem is formulated as a Linear Programming (LP) model with two objectives: minimizing ...

Saif, A.

248

Simulation Study of Hybrid Ground Source Heat Pump System in the Hot-Humid Climate.  

E-Print Network (OSTI)

??The beachfront hotel with hybrid geothermal heat pump system (HyGSHP), located in the hot-humid climate, is simulated by TRNSYS in the thesis, and the simulation (more)

Zhu, Jiang

2011-01-01T23:59:59.000Z

249

Synthesis of quantized feedback control software for discrete time linear hybrid systems  

Science Conference Proceedings (OSTI)

We present an algorithm that given a Discrete Time Linear Hybrid System${\\cal H}$ returns a correct-by-construction software implementation K for a (near time optimal) robust quantized feedback controller for ${\\cal H}$ along with ...

Federico Mari; Igor Melatti; Ivano Salvo; Enrico Tronci

2010-07-01T23:59:59.000Z

250

Fuel Cell-Fuel Cell Hybrid System Contact NETL Technology Transfer...  

NLE Websites -- All DOE Office Websites (Extended Search)

Cell-Fuel Cell Hybrid System Contact NETL Technology Transfer Group techtransfer@netl.doe.gov November 2012 Opportunity Research on the patented technology "Fuel Cell-Fuel Cell...

251

AT GUANTANAMO BAY: A HYBRID WIND-DIESEL SYSTEM  

E-Print Network (OSTI)

Laboratory and are actively developing what will be the world's largest wind-diesel hybrid electric plant. The pending installation of four 950-kW wind turbines to supplement the 22.8 MW diesel electricity plant diesel fuel usage in the base, while not adversely affecting the power grid or the diesels. The reduced

Massachusetts at Amherst, University of

252

Hybrid energy storage systems and battery management for electric vehicles  

Science Conference Proceedings (OSTI)

Electric vehicles (EV) are considered as a strong alternative of internal combustion engine vehicles expecting lower carbon emission. However, their actual benefits are not yet clearly verified while the energy efficiency can be improved in many ways. ... Keywords: battery-supercapacitor hybrid, charging/discharging asymmetry, electric vehicle, regenerative braking

Sangyoung Park, Younghyun Kim, Naehyuck Chang

2013-05-01T23:59:59.000Z

253

Embodied Energy and Off-Grid Lighting  

E-Print Network (OSTI)

Self-reported Impacts of LED Lighting Technology Comparedto Fuel-based Lighting on Night Market Business Prosperity28, no. 4, pp. 533-546. Lighting Africa (prepared by Dalberg

Alstone, Peter

2012-01-01T23:59:59.000Z

254

1978 source book for fusion--fission hybrid systems. Executive summary  

SciTech Connect

The 1978 Source Book for Fusion--Fission Hybrid Systems was prepared by United Engineers and Constructors Inc. for the U.S. Department of Energy and the Electric Power Research Institute. It reviews the current status of fusion--fission hybrid reactors, and presents the prevailing views of members of the fusion community on the RD and D timetable required for the development and commercialization of fusion--fission hybrids. The results presented are based on a review of related references as well as interviews with recognized experts in the field. Contributors from the academic and industrial communities are listed.

Crowley, J.H.; Pavlenco, G.F.; Kaminski, R.S.

1978-12-01T23:59:59.000Z

255

Spectroscopy identification performance enhancement of a novel CZT/CsI hybrid system  

Science Conference Proceedings (OSTI)

New hybrid spectroscopic systems directly combine spectra from detectors with very different energy resolutions, accommodating standard analyses of the output hybrid spectrum. Simulations of a hybrid system consisting of a 2 or 4 cm{sup 3} cadmium zinc telluride detector combined with a 32.8 cm{sup 3} CsI(Tl) were evaluated for identification performance. 29 nuclides of interest for security applications were simulated as singles and unique pairs, producing 435 spectral simulations at live times of 3, 10, 30, 100 and 300 seconds. The nuclides were modeled as point sources at 25 cm with activities that provide an interesting range of statistical significance for the range of counting times. Standard nuclide identification analyses were applied to the component detectors as well as the hybrid combination. Tallies of the results were used to calculate true and false identification rates. The hybrid system was shown to provide an identification performance benefit, consistently achieving performances closest to ideal relative to the separate component detectors. The hybrid approach enables the consideration of a greater variety of measurement system solutions in terms of cost and performance. (authors)

Russ, W.; Nakazawa, D.; Hau, I.; Morichi, M. [Canberra Industries, Inc., AREVA Company (United States)

2011-07-01T23:59:59.000Z

256

A hybrid intelligent system for alarm processing in power distribution substations  

Science Conference Proceedings (OSTI)

This application paper presents an intelligent system for alarm processing and fault location in power substations. A hybrid model is constructed using rule-based systems and an artificial neural network. Incoming alarms are initially handled by an input ... Keywords: Expert systems, fault location, neural networks

J. C. Stacchini de Souza; M. B. Do Coutto Filho; R. S. Freund

2010-04-01T23:59:59.000Z

257

Center for Sustainability Hybrid Renewable Energy Systems (HyRES) Laboratory  

E-Print Network (OSTI)

System Features In addition to competition systems - Whisper 500 wind turbine - Hydrogen Electilizer wind, solar, and hydrogen fuel cell technologies is planned for an experimental residence built at Penn will feature a hybrid solar-wind energy system and car-home hydrogen interface #12;Competition Mode: Solar

Lee, Dongwon

258

Preliminary Results on Luminaire Designs for Hybrid Solar Lighting Systems  

DOE Green Energy (OSTI)

We report on the design of two hybrid lighting luminaires that blend light from a fiber optic end-emitted solar source with electric T8 fluorescent lamps. Both designs involve the retrofit of a commercially-available recessed fluorescent luminaire with minimal reductions in the original luminaire's optical efficiency. Two methods for high-angle dispersion of fiber optic end-emitted solar light are described and the resulting spatial intensity distributions, simulated using ZEMAX, are compared with standard cylindrical fluorescent tubes. Differences in spatial intensity distribution are qualitatively characterized and potential design improvements discussed.

Earl, D.D.

2001-06-15T23:59:59.000Z

259

Amp-hour counting control for PV hybrid power systems  

SciTech Connect

The performance of an amp-hour (Ah) counting battery charge control algorithm has been defined and tested using the Digital Solar Technologies MPR-9400 microprocessor based PV hybrid charge controller. This work included extensive field testing of the charge algorithm on flooded lead-antimony and valve regulated lead-acid (VRLA) batteries. The test results after one-year have demonstrated that PV charge utilization, battery charge control, and battery state of charge (SOC) has been significantly improved by providing maximum charge to the batteries while limiting battery overcharge to manufacturers specifications during variable solar resource and load periods.

Hund, T.D. [Sandia National Labs., Albuquerque, NM (United States); Thompson, B. [Biri Systems, Ithaca, NY (United States)

1997-06-01T23:59:59.000Z

260

Hybrid membrane--PSA system for separating oxygen from air ...  

The system is a unique gas separation system that ... Energy Innovation ... Sandia National Laboratories - Visit the Intellectual Property Management and ...

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

System design verification of a hybrid geothermal/coal fired power plant  

DOE Green Energy (OSTI)

This hybrid plant utilizes geothermal fluid for feedwater heating. With respect to the extraction of available work from the geothermal fluids, this cycle is approximately two times as efficient as the all geothermal plant. The System Design Verification Study presented verifies the technical and economic feasibility of the hybrid plant. This report is comprised of a conceptual design, cost estimate, and economic analysis of a one-unit 715 MW hybrid geothermal/coal fired power plant. In addition to the use of geothermal fluid for feedwater heating, its use is also investigated for additional power generation, condensate and cooling tower makeup water, coal beneficiation, air preheating, flue gas reheating and plant space heating requirements. An engineering and construction schedule for the hybrid plant is also included.

Not Available

1978-09-01T23:59:59.000Z

262

Los Alamos hybrid environment: an integrated development/configuration management system  

SciTech Connect

I present the details of a hybrid configuration management system that utilizes a commercial configuration management tool (Softool's Change and Configuration Control environment) to monitor and control the development of mission-critical software systems at the Los Alamos Weapons Neutron Research Facility. The hybrid system combines features of the VMS host operating system and elements of the tool environment to integrate a flexible development environment with a very powerful automated configuration management system. The features of this system are presented with particular emphasis on the benefits of the hybrid approach. The complementary nature of the constituent environments is described. Special attention is given the issues of operational tradeoffs, personnel interaction and utilization, management visibility and overall system performance. It is shown that by employing a special interface data structure, the hybrid environment supports a much higher level of automation (of both development and configuration management activities) than is realizable in either environment individually. Examples are provided to illustrate the extent to which development activities and all phases of configuration management can be automated under this system. It is shown that in the process of providing a rigorous configuration management environment, the system remains virtually transparent to software development personnel and actually enhances the programmer's capabilities.

Cort, G.

1984-01-01T23:59:59.000Z

263

Efficiency and Loss Models for Key Electronic Components of Hybrid and Plug-in Hybrid Electric Vehicles' Electrical Propulsion Systems  

DOE Green Energy (OSTI)

Isolated gate bipolar transistors (IGBTs) are widely used in power electronic applications including electric, hybrid electric, and plug-in hybrid electric vehicles (EVs, HEVs, and PHEVs). The trend towards more electric vehicles (MEVs) has demanded the need for power electronic devices capable of handling power in the range of 10-100 kW. However, the converter losses in this power range are of critical importance. Therefore, thermal management of the power electronic devices/converters is crucial for the reliability and longevity of the advanced vehicles. To aid the design of heat exchangers for the IGBT modules used in propulsion motor drives, a loss model for the IGBTs is necessary. The loss model of the IGBTs will help in the process of developing new heat exchangers and advanced thermal interface materials by reducing cost and time. This paper deals with the detailed loss modeling of IGBTs for advanced electrical propulsion systems. An experimental based loss model is proposed. The proposed loss calculation method utilizes the experimental data to reconstruct the loss surface of the power electronic devices by means of curve fitting and linear extrapolating. This enables the calculation of thermal losses in different voltage, current, and temperature conditions of operation. To verify the calculation method, an experimental test set-up was designed and built. The experimental set-up is an IGBT based bi-directional DC/DC converter. In addition, simulation results are presented to verify the proposed calculation method.

Cao, J.; Bharathan, D.; Emadi, A.

2007-01-01T23:59:59.000Z

264

FRASH: Exploiting storage class memory in hybrid file system for hierarchical storage  

Science Conference Proceedings (OSTI)

In this work, we develop a novel hybrid file system, FRASH, for storage-class memory and NAND Flash. Despite the promising physical characteristics of storage-class memory, its scale is an order of magnitude smaller than the current storage device scale. ... Keywords: Flash storage, log-structured file system

Jaemin Jung; Youjip Won; Eunki Kim; Hyungjong Shin; Byeonggil Jeon

2010-03-01T23:59:59.000Z

265

FlySPEC: a multi-user video camera system with hybrid human and automatic control  

Science Conference Proceedings (OSTI)

FlySPEC is a video camera system designed for real-time remote operation. A hybrid design combines the high resolution of an optomechanical video camera with the wide field of view always available from a panoramic camera. The control system integrates ... Keywords: collaborative and automatic camera control, distance learning, gesture based camera control, panoramic video, video communication, video conferencing, video production, webcams

Qiong Liu; Don Kimber; Jonathan Foote; Lynn Wilcox; John Boreczky

2002-12-01T23:59:59.000Z

266

A Hybrid Energy System Using Cascaded H-bridge Converter , Zhong Du2  

E-Print Network (OSTI)

energy system, cascaded multilevel converter, single dc source I. INTRODUCTION As different energy generation, storage, and transmission. The power from hybrid energy systems can be combined on the dc side of Energy Source 1 and Energy Source 2. To analyze mode I, a dc source is assumed to be connected

Tolbert, Leon M.

267

Design of a hybrid type self-powered active sussension system  

Science Conference Proceedings (OSTI)

In this paper, authors propose a new hybrid type self-powered active suspension system for ground vehicles. System is composed of an electronic control unit (ECU), a power electronics module, and electric double-layer capacitor (EDLC) bank, a permanent ...

Hakan Sahin; Naoto Fukushima; Takahiro Mochizuki; Ichiro Hagiwara

2009-02-01T23:59:59.000Z

268

Finding all solutions of nonlinear systems using a hybrid metaheuristic with Fuzzy Clustering Means  

Science Conference Proceedings (OSTI)

Abstract: We apply a recently introduced hybrid metaheuristic to solve nonlinear systems of equations with multiple roots as an optimization problem. In this technique, first, the Luus-Jaakola random search method is used to explore the search space. ... Keywords: Fuzzy clustering, Global optimization, Metaheuristics, Nonlinear systems

W. F. Sacco; N. Henderson

2011-12-01T23:59:59.000Z

269

Optimal control of a grid-connected hybrid electrical energy storage system for homes  

Science Conference Proceedings (OSTI)

Integrating residential photovoltaic (PV) power generation and electrical energy storage (EES) systems into the Smart Grid is an effective way of utilizing renewable power and reducing the consumption of fossil fuels. This has become a particularly interesting ... Keywords: hybrid electrical energy storage system, optimal control, smart grid

Yanzhi Wang, Xue Lin, Massoud Pedram, Sangyoung Park, Naehyuck Chang

2013-03-01T23:59:59.000Z

270

A Paired-Orientation Alignment Problem in a Hybrid Tracking System for Computer Assisted Surgery  

Science Conference Proceedings (OSTI)

Coordinate Alignment (CA) is an important problem in hybrid tracking systems involving two or more tracking devices. CA typically associates the measurements from two or more tracking systems with respect to distinct base frames and makes them comparable ... Keywords: Computer assisted surgery (CAS), Coordinate alignment, Paired-Orientation Alignment (POA), Quaternions, Surgical navigation

Hongliang Ren; Peter Kazanzides

2011-08-01T23:59:59.000Z

271

Evaluation of the 2010 Toyota Prius Hybrid Synergy Drive System  

DOE Green Energy (OSTI)

Subsystems of the 2010 Toyota Prius hybrid electric vehicle (HEV) were studied and tested as part of an intensive benchmarking effort carried out to produce detailed information concerning the current state of nondomestic alternative vehicle technologies. Feedback provided by benchmarking efforts is particularly useful to partners of the Vehicle Technologies collaborative research program as it is essential in establishing reasonable yet challenging programmatic goals which facilitate development of competitive technologies. The competitive nature set forth by the Vehicle Technologies Program (VTP) not only promotes energy independence and economic stability, it also advocates the advancement of alternative vehicle technologies in an overall global perspective. These technologies greatly facilitate the potential to reduce dependency on depleting natural resources and mitigate harmful impacts of transportation upon the environment.

Burress, Timothy A [ORNL; Campbell, Steven L [ORNL; Coomer, Chester [ORNL; Ayers, Curtis William [ORNL; Wereszczak, Andrew A [ORNL; Cunningham, Joseph Philip [ORNL; Marlino, Laura D [ORNL; Seiber, Larry Eugene [ORNL; Lin, Hua-Tay [ORNL

2011-03-01T23:59:59.000Z

272

Reversible information-energy conversions in a quantum hybrid system  

E-Print Network (OSTI)

We investigate the properties of a quantum hybrid opto-mechanical transducer in the context of information thermodynamics, and show that it provides a valuable platform to monitor information- to-energy conversions at the quantum level. An optically active emitter interacts with the electromagnetic field, that plays the role of an out-of-equilibrium heat bath. The bit of information encoded in the emitter is reversibly converted into mechanical energy stored in a nano-resonator whose displacement is measurable in time, offering direct access to the elementary work exchanged. The study of the complete thermodynamical cycle described over a full mechanical period reveals a new type of Landauer's erasure that produces, instead of costing, work. We finally show that this device can be turned into a powerful heat engine operating at Carnot efficiency.

Cyril Elouard; Maxime Richard; Alexia Auffves

2013-09-20T23:59:59.000Z

273

The Hybrid Solid Oxide Fuel Cell (SOFC) and Gas Turbine (GT) Systems Steady State Modeling  

E-Print Network (OSTI)

Solid Oxide Fuel Cells (SOFCs) are of great interest nowadays. The feature of SOFCs makes them suitable for hybrid systems because they work high operating temperature and when combined with conventional turbine power plants offer high cycle efficiencies. In this work a hybrid solid oxide fuel cell and gas turbine power system model is developed. Two models have been developed based on simple thermodynamic expressions. The simple models are used in the preliminary part of the study and a more realistic based on the performance maps. A comparative study of the simulated configurations, based on an energy analysis is used to perform a parametric study of the overall hybrid system efficiency. Some important observations are made by means of a sensitivity study of the whole cycle for the selected configuration. The results of the selected model were compared to an earlier model from an available literature.

Penyarat Chinda; Pascal Brault

2012-01-01T23:59:59.000Z

274

Multidisciplinary Modeling, Control, and Optimization of a Solid Oxide Fuel Cell/Gas Turbine Hybrid Power System.  

E-Print Network (OSTI)

??This thesis describes a systematical study, including multidisciplinary modeling, simulation, control, and optimization, of a fuel cell - gas turbine hybrid power system that aims (more)

Abbassi Baharanchi, Atid

2009-01-01T23:59:59.000Z

275

DOE/NREL Inner Mongolia PV/Wind Hybrid Systems Pilot Project: A Post-Installation Assessment  

DOE Green Energy (OSTI)

This report assesses the Inner Mongolia Pilot Project, which disseminates wind-solar hybrid systems to a rural and remote population.

Stroup, K. K.

2005-02-01T23:59:59.000Z

276

HybridStore: A Cost-Efficient, High-Performance Storage System Combining SSDs and HDDs  

SciTech Connect

Unlike the use of DRAM for caching or buffering, certain idiosyncrasies of NAND Flash-based solid-state drives (SSDs) make their integration into existing systems non-trivial. Flash memory suffers from limits on its reliability, is an order of magnitude more expensive than the magnetic hard disk drives (HDDs), and can sometimes be as slow as the HDD (due to excessive garbage collection (GC) induced by high intensity of random writes). Given these trade-offs between HDDs and SSDs in terms of cost, performance, and lifetime, the current consensus among several storage experts is to view SSDs not as a replacement for HDD but rather as a complementary device within the high-performance storage hierarchy. We design and evaluate such a hybrid system called HybridStore to provide: (a) HybridPlan: improved capacity planning technique to administrators with the overall goal of operating within cost-budgets and (b) HybridDyn: improved performance/lifetime guarantees during episodes of deviations from expected workloads through two novel mechanisms: write-regulation and fragmentation busting. As an illustrative example of HybridStore s ef cacy, HybridPlan is able to nd the most cost-effective storage con guration for a large scale workload of Microsoft Research and suggest one MLC SSD with ten 7.2K RPM HDDs instead of fourteen 7.2K RPM HDDs only. HybridDyn is able to reduce the average response time for an enterprise scale random-write dominant workload by about 71% as compared to a HDD-based system.

Kim, Youngjae [ORNL; Gupta, Aayush [Pennsylvania State University, University Park, PA; Urgaonkar, Bhuvan [Pennsylvania State University; Piotr, Berman [Pennsylvania State University, University Park, PA; Sivasubramaniam, Anand [Pennsylvania State University

2011-01-01T23:59:59.000Z

277

A "Hybrid" Approach for Synthesizing Optimal Controllers of Hybrid Systems: A Case Study of the Oil Pump Industrial Example  

E-Print Network (OSTI)

In this paper, we propose an approach to reduce the optimal controller synthesis problem of hybrid systems to quantifier elimination; furthermore, we also show how to combine quantifier elimination with numerical computation in order to make it more scalable but at the same time, keep arising errors due to discretization manageable and within bounds. A major advantage of our approach is not only that it avoids errors due to numerical computation, but it also gives a better optimal controller. In order to illustrate our approach, we use the real industrial example of an oil pump provided by the German company HYDAC within the European project Quasimodo as a case study throughout this paper, and show that our method improves (up to 7.5%) the results reported in [3] based on game theory and model checking.

Zhao, Hengjun; Kapur, Deepak; Larsen, Kim G

2012-01-01T23:59:59.000Z

278

Balance-of-System Equipment Required for Renewable Energy Systems |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Balance-of-System Equipment Required for Renewable Energy Systems Balance-of-System Equipment Required for Renewable Energy Systems Balance-of-System Equipment Required for Renewable Energy Systems July 2, 2012 - 8:21pm Addthis Both grid-connected and off-grid home renewable energy systems require additional “balance-of-system” equipment. Both grid-connected and off-grid home renewable energy systems require additional "balance-of-system" equipment. How does it work? With a stand-alone system, depending on your needs, balance-of-system equipment could account for half of your total system costs. For both stand-alone and grid-connect systems, you will need power conditioning equipment, safety equipment, and meters and instrumentation. For stand-alone systems, you will also want batteries and charge controllers.

279

Efficiency of a hybrid-type plasma-assisted fuel reformation system  

Science Conference Proceedings (OSTI)

The major advantages of a new plasma-assisted fuel reformation system are its cost effectiveness and technical efficiency. Applied Plasma Technologies has proposed its new highly efficient hybrid-type plasma-assisted system for organic fuel combustion and gasification. The system operates as a multimode multipurpose reactor in a wide range of plasma feedstock gases and turndown ratios. This system also has convenient and simultaneous feeding of several reagents in the reaction zone such as liquid fuels, coal, steam, and air. A special methodology has been developed for such a system in terms of heat balance evaluation and optimization. This methodology considers all existing and possible energy streams, which could influence the system's efficiency. The developed hybrid-type plasma system could be suitable for combustion applications, mobile and autonomous small- to mid-size liquid fuel and coal gasification modules, hydrogen-rich gas generators, waste-processing facilities, and plasma chemical reactors.

Matveev, I.B.; Serbin, S.I.; Lux, S.M. [Applied Plasma Technologies, Mclean, VA (USA)

2008-12-15T23:59:59.000Z

280

Summary Report of the INL-JISEA Workshop on Nuclear Hybrid Energy Systems  

Science Conference Proceedings (OSTI)

The Institute for Nuclear Energy Science and Technology (INEST) and the Joint Institute for Strategic Energy Analysis (JISEA) co-sponsored an international workshop to identify research topics important in advancing the potential use of hybrid systems with a specific focus on nuclear-renewable hybrid systems. The workshop included presentations ranging from energy challenges and research and development directions being pursued by nations to multiple options for hybrid systems. Those options include one that is being commercialized to other opportunities and analysis results quantifying them. The workshop also involved two breakout sessions--one focused on thermal energy management issues especially at unit-operation scale and the second focused on system operations issues including system controls, regulatory issues, technical and economic analysis, and market challenges. A discussion involving the full group focused on more general issues such as societal involvement and participation. Key criteria for selecting hybrid energy system projects and metrics for comparing them were also identified by the full group.

Antkowiak, M.; Ruth, M.; Boardman, R.; Bragg-Sitton, S.; Cherry, R.; Shunn, L.

2012-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

State estimation of probabilistic hybrid systems with particle filters  

E-Print Network (OSTI)

Robotic and embedded systems have become increasingly pervasive in every-day applications, ranging from space probes and life support systems to autonomous rovers. In order to act robustly in the physical world, robotic ...

Funiak, Stanislav, 1978-

2004-01-01T23:59:59.000Z

282

Hybrid power management system and method - Energy Innovation ...  

Solar Photovoltaic; Solar Thermal; Startup America; Vehicles and Fuels; ... Space power systems; Technology Status. Development Stage Availability Published Last Updated;

283

STATEMENT OF CONSIDERATIONS REQUEST BY HYBRID POWER GENERATION SYSTEMS, LLC FOR AN ADVANCE  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

JRN 19 2006 15:31 FR IPL DOE CH 630 252 2779 TO AGCP-HQ P.02/03 JRN 19 2006 15:31 FR IPL DOE CH 630 252 2779 TO AGCP-HQ P.02/03 * * STATEMENT OF CONSIDERATIONS REQUEST BY HYBRID POWER GENERATION SYSTEMS, LLC FOR AN ADVANCE WAIVER OF PATENT RIGHTS UNDER DOE COOPERATIVE AGREEMENT NO. DE-FC36-04G014351 ENTITLED "HIGH PERFORMANCE FLEXIBLE REVERSIBLE SOLID OXIDE FUEL CELL"; W(A)-04-080; CH-1259 As set out in the attached waiver petition and in subsequent discussions with DOE patent counsel, Hybrid Power Generation Systems, LLC (Hybrid Power), a wholly owned subsidiary of General Electric Company (GE), has requested an advance waiver of domestic and foreign patent rights for all subject inventions made under the above-identified cooperative agreement by its employees and its subcontractors' employees, regardless of tier, except

284

Combustion flame-plasma hybrid reactor systems, and chemical reactant sources  

Science Conference Proceedings (OSTI)

Combustion flame-plasma hybrid reactor systems, chemical reactant sources, and related methods are disclosed. In one embodiment, a combustion flame-plasma hybrid reactor system comprising a reaction chamber, a combustion torch positioned to direct a flame into the reaction chamber, and one or more reactant feed assemblies configured to electrically energize at least one electrically conductive solid reactant structure to form a plasma and feed each electrically conductive solid reactant structure into the plasma to form at least one product is disclosed. In an additional embodiment, a chemical reactant source for a combustion flame-plasma hybrid reactor comprising an elongated electrically conductive reactant structure consisting essentially of at least one chemical reactant is disclosed. In further embodiments, methods of forming a chemical reactant source and methods of chemically converting at least one reactant into at least one product are disclosed.

Kong, Peter C

2013-11-26T23:59:59.000Z

285

Towards sensitivity analysis of hybrid systems using simulink  

Science Conference Proceedings (OSTI)

In the design of engineered systems two types of models are used: (i) analysis models and (ii) system models. The system models are primary deliverables between design stages whereas analysis models are employed within a design stage. Sensitivity analysis ... Keywords: sensitivity analysis, simulation, verification

Zhi Han; Pieter J. Mosterman

2013-04-01T23:59:59.000Z

286

A hybrid tele-diagnosis system on fish disease  

Science Conference Proceedings (OSTI)

Fish disease diagnosis is a complicated process and requires high level of expertise, an expert system for fish disease diagnosis is considered as an effective tool to help fish farmers. However, many farmers have no computers and are not able to access ... Keywords: call centre, expert system, group decision support system, machine learning

Daoliang Li; Wei Zhu; Zetian Fu

2006-04-01T23:59:59.000Z

287

Hybrid Discrete and Continuous Control for Power Systems  

Science Conference Proceedings (OSTI)

The control of the electricity supply from generation to end-use has been an engineering and mathematical challenge for many decades. The continuous increase in power requirements, system interconnections and technological options prompted the search ... Keywords: electric systems, intelligent controls, power systems

W. H. Esselman; D. J. Sobajic; J. Maulbetsch

1999-11-01T23:59:59.000Z

288

GSI 3DVar-based Ensemble-Variational Hybrid Data Assimilation for NCEP Global Forecast System: Single Resolution Experiments  

Science Conference Proceedings (OSTI)

An ensemble Kalman filter-variational hybrid data assimilation system based on the grid point statistical interpolation (GSI) three dimensional variational (3DVar) system was developed. The performance of the system was investigated using the ...

Xuguang Wang; David Parrish; Daryl Kleist; Jeffrey Whitaker

289

Hybrid robust predictive optimization method of power system dispatch  

DOE Patents (OSTI)

A method of power system dispatch control solves power system dispatch problems by integrating a larger variety of generation, load and storage assets, including without limitation, combined heat and power (CHP) units, renewable generation with forecasting, controllable loads, electric, thermal and water energy storage. The method employs a predictive algorithm to dynamically schedule different assets in order to achieve global optimization and maintain the system normal operation.

Chandra, Ramu Sharat (Niskayuna, NY); Liu, Yan (Ballston Lake, NY); Bose, Sumit (Niskayuna, NY); de Bedout, Juan Manuel (West Glenville, NY)

2011-08-02T23:59:59.000Z

290

Renewable Energy in China: Xiao Qing Dao Village Power Wind/Diesel Hybrid Pilot Project  

DOE Green Energy (OSTI)

In 2000, DOE/NREL and the State Power Corporation of China (SPCC) developed a pilot project to electrify Xiao Qing Dao, a small island located in China's Yellow Sea. The project demonstrates the practicality of renewable energy systems for medium-scale, off-grid applications. It consists of four 10 k-W wind turbines connected to a 30-kW diesel generator, a 40-kW inverter and a battery bank.

Not Available

2006-01-01T23:59:59.000Z

291

Renewable Energy in China: Xiao Qing Dao Village Power Wind/Diesel Hybrid Pilot Project  

SciTech Connect

In 2000, DOE/NREL and the State Power Corporation of China (SPCC) developed a pilot project to electrify Xiao Qing Dao, a small island located in China's Yellow Sea. The project demonstrates the practicality of renewable energy systems for medium-scale, off-grid applications. It consists of four 10 k-W wind turbines connected to a 30-kW diesel generator, a 40-kW inverter and a battery bank.

2006-01-01T23:59:59.000Z

292

A 20-SUN HYBRID PV-THERMAL LINEAR MICRO-CONCENTRATOR SYSTEM FOR URBAN ROOFTOP APPLICATIONS  

E-Print Network (OSTI)

factor satisfies aesthetic demands for general rooftop solar technologies, and is a marked departure fromA 20-SUN HYBRID PV-THERMAL LINEAR MICRO-CONCENTRATOR SYSTEM FOR URBAN ROOFTOP APPLICATIONS D Walter has been developed specifically for urban rooftop environments. The light- weight, low-profile form

293

On-chip hybrid power supply system for wireless sensor nodes  

Science Conference Proceedings (OSTI)

With the miniaturization of electronic devices, small size but high capacity power supply system appears to be more and more important. A hybrid power source, which consists of a fuel cell (FC) and a rechargeable battery, has the advantages of long lifetime ...

Wulong Liu; Yu Wang; Wei Liu; Yuchun Ma; Yuan Xie; Huazhong Yang

2011-01-01T23:59:59.000Z

294

Battery-Supercapacitor Hybrid System for High-Rate Pulsed Load Applications  

E-Print Network (OSTI)

Battery-Supercapacitor Hybrid System for High-Rate Pulsed Load Applications Donghwa Shin, Younghyun layer capacitors, or simply supercapacitors, have extremely low internal resistance, and a battery-supercapacitor architecture comprising a simple parallel connection does not perform well when the supercapacitor capacity

Pedram, Massoud

295

An autonomous hybrid robot system to navigate through unknown maze environments  

Science Conference Proceedings (OSTI)

This paper describes a fully complete autonomous hybrid robot system, named YAM (Yet Another Mouse), that is able to navigate through an unknown maze environment. YAM effectively tackles the problem of how to represent the environment using its sensor ... Keywords: intelligent agents, knowledge representation, path planning, robot competitions

Pedro Ribeiro

2007-08-01T23:59:59.000Z

296

On the self-organization of a hybrid peer-to-peer system  

Science Conference Proceedings (OSTI)

Decentralized peer-to-peer (P2P) systems can be classified into unstructured and structured. The former is easy to implement, and often simply uses flooding for search, which can be effective only when target objects are popular or nearby. The latter ... Keywords: Hybrid overlay, Overlay construction, P2P, Structured overlay, Unstructured overlay

Yuh-Jzer Joung; Zhang-Wen Lin

2010-03-01T23:59:59.000Z

297

Research on Fault Diagnosis of Hydropower Unit Based on Expert System and Hybrid Reasoning  

Science Conference Proceedings (OSTI)

With the rapid development of computer and monitoring technologies in recent years, more and more online monitoring equipment of hydropower units have been installed and applied in hydropower plants, and so began the long-term accumulation of data. Although ... Keywords: fault diagnosis, hydropower unit, expert system, hybrid reasoning

Ye Zhou; Luoping Pan

2012-05-01T23:59:59.000Z

298

INTEGRATING THE DESIGN AND RELIABILITY ASSESSMENT OF A HYBRID PV-THERMAL MICROCONCENTRATOR SYSTEM  

E-Print Network (OSTI)

INTEGRATING THE DESIGN AND RELIABILITY ASSESSMENT OF A HYBRID PV-THERMAL MICROCONCENTRATOR SYSTEM M that the materials from the power electronics industry are also reliable when used in a concentrator PV module and reliability testing have been integrated as concurrent processes, enabling the early optimisation

299

The Effect of PV Array Size and Battery Size on the Economics of PV/Diesel/Battery Hybrid RAPS Systems  

E-Print Network (OSTI)

The Effect of PV Array Size and Battery Size on the Economics of PV/Diesel/Battery Hybrid RAPS WA 6150 Abstract This paper focuses on pv/diesel/battery hybrid RAPS systems meeting loads above 50 kWh per day. The effect of varying the size of the pv array and the battery bank in such systems on both

300

Reactor Subsystem Simulation for Nuclear Hybrid Energy Systems  

SciTech Connect

Preliminary system models have been developed by Idaho National Laboratory researchers and are currently being enhanced to assess integrated system performance given multiple sources (e.g., nuclear + wind) and multiple applications (i.e., electricity + process heat). Initial efforts to integrate a Fortran-based simulation of a small modular reactor (SMR) with the balance of plant model have been completed in FY12. This initial effort takes advantage of an existing SMR model developed at North Carolina State University to provide initial integrated system simulation for a relatively low cost. The SMR subsystem simulation details are discussed in this report.

Shannon Bragg-Sitton; J. Michael Doster; Alan Rominger

2012-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Hybrid membrane--PSA system for separating oxygen from air  

Science Conference Proceedings (OSTI)

A portable, non-cryogenic, oxygen generation system capable of delivering oxygen gas at purities greater than 98% and flow rates of 15 L/min or more is described. The system consists of two major components. The first component is a high efficiency membrane capable of separating argon and a portion of the nitrogen content from air, yielding an oxygen-enriched permeate flow. This is then fed to the second component, a pressure swing adsorption (PSA) unit utilizing a commercially available, but specifically formulated zeolite compound to remove the remainder of the nitrogen from the flow. The system is a unique gas separation system that can operate at ambient temperatures, for producing high purity oxygen for various applications (medical, refining, chemical production, enhanced combustion, fuel cells, etc . . . ) and represents a significant advance compared to current technologies.

Staiger, Chad L. (Albuquerque, NM); Vaughn, Mark R. (Albuquerque, NM); Miller, A. Keith (Albuquerque, NM); Cornelius, Christopher J. (Blackburg, VA)

2011-01-25T23:59:59.000Z

302

Design and Evaluation of Hybrid Fault-Detection Systems  

Science Conference Proceedings (OSTI)

As chip densities and clock rates increase, processors are becoming more susceptible to transient faults that can affect program correctness. Up to now, system designers have primarily considered hardware-only and software-only fault-detection mechanisms ...

George A. Reis; Jonathan Chang; Neil Vachharajani; Ram Rangan; David I. August; Shubhendu S. Mukherjee

2005-06-01T23:59:59.000Z

303

Simulation of Hybrid Ground Source Heat Pump Systems and Experimental Validation  

E-Print Network (OSTI)

Hybrid ground source heat pump systems incorporate both ground loop heat exchangers and auxiliary heat rejecters, such as cooling towers, fluid coolers, cooling ponds, or pavement heating systems. The design of the hybrid ground source heat pump system involves many degrees of freedom; e.g. the size of the cooling tower interacts with the control strategy, the ground loop heat exchanger design, and other parameters. This paper presents a simulation of such a system using a direct contact evaporative cooling tower as the supplemental heat rejecter. The simulation is performed in a component-based modeling environment using component models of a vertical ground loop heat exchanger, plate frame heat exchanger, cooling tower, circulating pumps, and heat pumps. Seven months (March to September 2005) of five-minutely experimental data from a hybrid ground source heat pump system were used for validation purposes. The source side of the system consists of two packaged water-to-water heat pumps, a three-borehole ground loop heat exchanger, and a direct contact evaporative cooling tower, isolated by a plate frame heat exchanger. The load side serves two small buildings with hydronic heating and cooling. Experimental validations of each component simulation and the entire system simulation are presented.

Jason E. Gentry; Jeffrey D. Spitler; Daniel E. Fisher; Xiaowei Xu

2006-01-01T23:59:59.000Z

304

Power Quality Issues in a Hybrid Power System: Preprint  

DOE Green Energy (OSTI)

We analyzed a power system network, which consisted of two types of power generation: wind turbine generation and diesel generation. The power quality and the interaction of diesel generation, the wind turbine, and the local load were the subjects of investigation. From an energy-production point of view, it is desirable to have as much wind energy production as possible in order to save fuel consumption of the diesel engines and to reduce the level of pollution. From the customer point of view, it is desirable to have good power quality at the receiving end. The purpose of this paper is to show the impact of wind power plant in the entire system. Also, we discuss how the startup of the wind turbine and the transient condition during load changes affects the voltage and frequency in the system.

Muljadi, E.; McKenna, H. E.

2001-09-01T23:59:59.000Z

305

Hybrid GPS-GSM Localization of Automobile Tracking System  

E-Print Network (OSTI)

An integrated GPS-GSM system is proposed to track vehicles using Google Earth application. The remote module has a GPS mounted on the moving vehicle to identify its current position, and to be transferred by GSM with other parameters acquired by the automobile's data port as an SMS to a recipient station. The received GPS coordinates are filtered using a Kalman filter to enhance the accuracy of measured position. After data processing, Google Earth application is used to view the current location and status of each vehicle. This goal of this system is to manage fleet, police automobiles distribution and car theft cautions.

Al-Khedher, Mohammad A

2012-01-01T23:59:59.000Z

306

Electric and Hybrid Vehicle System Research and Development Project: Hybrid Vehicle Potential Assessment. Volume VI. Cost analysis  

DOE Green Energy (OSTI)

The purpose of the cost analysis is to determine the economic feasibility of a variety of hybrid vehicles with respect to conventional vehicles specifically designed for the same duty cycle defined by the mission analysis. Several different hybrid configurations including parallel, parallel-flywheel, and series vehicles were evaluated. The ramifications of incorporating examples of advanced batteries, these being the advanced lead-acid, nickel-zinc, and sodium sulfur were also investigated. Vehicles were specifically designed with these batteries and for the driving cycles specified by the mission. Simulated operation on the missions yielded the energy consumption (petroleum and/or electricity) over the driving cycles. It was concluded that: in the event that gasoline prices reach $2.50 to $3.00/gal, hybrid vehicles in many applications will become economically competitive with conventional vehicles without subsidization; in some commercial applications hybrid vehicles could be economically competitive, when the gasoline price ranges from $1.20 to $1.50/gal. The cost per kWh per cycle of the advanced batteries is much more important economically than the specific energy; the series hybrid vehicles were found to be more expensive in comparison to the parallel or parallel-flywheel hybrids when designed as passenger vehicles; and hybrid vehicles designed for private use could become economically competitive and displace up to 50% of the fuel normally used on that mission if subsidies of $500 to $2000 were supplied to the owner/operator. (LCL)

Hardy, K.S.

1979-09-30T23:59:59.000Z

307

Hybrid Ground Source Heat Pump System Simulation Using Visual Modeling Tool For Hvacsim  

E-Print Network (OSTI)

This paper presents a simulation of a hybrid ground source heat pump system, performed using a new graphical user interface for HVACSIM+. Hybrid ground source heat pump systems incorporate both ground loop heat exchangers and supplemental heat rejecters, such as cooling towers, cooling ponds, or pavement heating systems. HVACSIM+ capabilities have recently been extended by the addition of ground loop heat exchanger models, water-to-water and waterto-air heat pump models, pavement heating system models, and heat rejection pond models. New component models are discussed and a hybrid ground source heat pump system with heated pavement as a supplemental cooler is simulated using the visual modeling tool. First, though, an introduction to a new graphical user interface for HVACSIM+ is given. The user interface that originally came with the program could not be characterized as user-friendly. The new graphical interface allows users to develop system models by hooking components together. Provisions for controlling the simulation, setting the component parameters, editing the boundary file, and plotting the output are also included.

M. H. Khan; A. Varanasi; J. D. Spitler; D. E. Fisher; R. D. Delahoussaye

2003-01-01T23:59:59.000Z

308

Bonfire: a nomadic system for hybrid laptop-tabletop interaction  

Science Conference Proceedings (OSTI)

We present Bonfire, a self-contained mobile computing system that uses two laptop-mounted laser micro-projectors to project an interactive display space to either side of a laptop keyboard. Coupled with each micro-projector is a camera to enable hand ... Keywords: ambient interaction, computer vision, extended display, gestures, laptop, micro-projector, object recognition, peripheral display, surface, tabletop, tangible bits

Shaun K. Kane; Daniel Avrahami; Jacob O. Wobbrock; Beverly Harrison; Adam D. Rea; Matthai Philipose; Anthony LaMarca

2009-10-01T23:59:59.000Z

309

Heavy Vehicle Systems, Int. J. of Vehicle Design, Vol. 11, Nos. 3/4, 2004 349 Modelling and control of a medium-duty hybrid  

E-Print Network (OSTI)

engine. Keywords: electric vehicles, electric-vehicle simulation, hybrid electric vehicles, hybrid-duty hybrid electric truck', Int. J. of Heavy Vehicle Systems, Vol. 11, Nos. 3/4, pp. 349­370. 1 Introduction. Hybrid-electric vehicles (HEV) appear to be one of the most viable technologies with significant

Peng, Huei

310

Operation o Solar Photovoltaic-Thermal (PVT) Hybrid System in KIER  

E-Print Network (OSTI)

The details of the Photovoltaic Thermal (PVT) hybrid air heating system, UTC air heating system and its effect on the performance of photovoltaic (PV) module and room temperature in KIER are explained in this paper. Two identical test rooms were constructed such that one had unglazed transpired collector on its south facing wall while other had no solar wall. The temperature inside the room with UTC was 10-20oC higher than the temperature inside the room without UTC on a typical winter day. In second set of experiments, 75W PV modules were installed on the south facing walls of each test rooms. The temperature of the PV module with UTC was 5-9?lower than the PV module without UTC resulting in a 6% recovery of output electrical power under the forced ventilation. PVT hybrid system may alleviate burden on conventional energy consumption in Korea for heating the buildings and electricity generation.

Naveed, A.T.; Lee, E. J.; Kang, E. C.

2006-01-01T23:59:59.000Z

311

Solar Central Receiver Hybrid Power Systems sodium-cooled receiver concept. Final report. Volume III. Appendices  

DOE Green Energy (OSTI)

The overall, long term objective of the Solar Central Receiver Hybrid Power System is to identify, characterize, and ultimately demonstrate the viability and cost effectiveness of solar/fossil, steam Rankine cycle, hybrid power systems that: (1) consist of a combined solar central receiver energy source and a nonsolar energy source at a single, common site, (2) may operate in the base, intermediate, and peaking capacity modes, (3) produce the rated output independent of variations in solar insolation, (4) provide a significant savings (50% or more) in fuel consumpton, and (5) produce power at the minimum possible cost in mills/kWh. It is essential that these hybrid concepts be technically feasible and economically competitive with other systems in the near to mid-term time period (1985-1990) on a commercial scale. The program objective for Phase I is to identify and conceptually characterize solar/fossil steam Rankine cycle, commercial-scale, power plant systems that are economically viable and technically feasible. This volume contains appendices to the conceptual design and systems analysis studies gien in Volume II, Books 1 and 2. (WHK)

None

1980-01-01T23:59:59.000Z

312

LiCl Dehumidifier LiBr absorption chiller hybrid air conditioning system with energy recovery  

SciTech Connect

This invention relates to a hybrid air conditioning system that combines a solar powered LiCl dehumidifier with a LiBr absorption chiller. The desiccant dehumidifier removes the latent load by absorbing moisture from the air, and the sensible load is removed by the absorption chiller. The desiccant dehumidifier is coupled to a regenerator and the desiccant in the regenerator is heated by solar heated hot water to drive the moisture therefrom before being fed back to the dehumidifier. The heat of vaporization expended in the desiccant regenerator is recovered and used to partially preheat the driving fluid of the absorption chiller, thus substantially improving the overall COP of the hybrid system.

Ko, Suk M. (Huntsville, AL)

1980-01-01T23:59:59.000Z

313

MPI-hybrid Parallelism for Volume Rendering on Large, Multi-core Systems  

Science Conference Proceedings (OSTI)

This work studies the performance and scalability characteristics of"hybrid'" parallel programming and execution as applied to raycasting volume rendering -- a staple visualization algorithm -- on a large, multi-core platform. Historically, the Message Passing Interface (MPI) has become the de-facto standard for parallel programming and execution on modern parallel systems. As the computing industry trends towards multi-core processors, with four- and six-core chips common today and 128-core chips coming soon, we wish to better understand how algorithmic and parallel programming choices impact performance and scalability on large, distributed-memory multi-core systems. Our findings indicate that the hybrid-parallel implementation, at levels of concurrency ranging from 1,728 to 216,000, performs better, uses a smaller absolute memory footprint, and consumes less communication bandwidth than the traditional, MPI-only implementation.

Howison, Mark; Bethel, E. Wes; Childs, Hank

2010-03-20T23:59:59.000Z

314

Hybrid Parallelism for Volume Rendering on Large, Multi-core Systems  

Science Conference Proceedings (OSTI)

This work studies the performance and scalability characteristics of"hybrid'"parallel programming and execution as applied to raycasting volume rendering -- a staple visualization algorithm -- on a large, multi-core platform. Historically, the Message Passing Interface (MPI) has become the de-facto standard for parallel programming and execution on modern parallel systems. As the computing industry trends towards multi-core processors, with four- and six-core chips common today and 128-core chips coming soon, we wish to better understand how algorithmic and parallel programming choices impact performance and scalability on large, distributed-memory multi-core systems. Our findings indicate that the hybrid-parallel implementation, at levels of concurrency ranging from 1,728 to 216,000, performs better, uses a smaller absolute memory footprint, and consumes less communication bandwidth than the traditional, MPI-only implementation.

Howison, Mark; Bethel, E. Wes; Childs, Hank

2010-07-12T23:59:59.000Z

315

Hybrid Parallelism for Volume Rendering on Large, Multi-core Systems  

SciTech Connect

This work studies the performance and scalability characteristics of"hybrid" parallel programming and execution as applied to raycasting volume rendering -- a staple visualization algorithm -- on a large, multi-core platform. Historically, the Message Passing Interface (MPI) has become the de-facto standard for parallel programming and execution on modern parallel systems. As the computing industry trends towards multi-core processors, with four- and six-core chips common today and 128-core chips coming soon, we wish to better understand how algorithmic and parallel programming choices impact performance and scalability on large, distributed-memory multi-core systems. Our findings indicate that the hybrid-parallel implementation, at levels of concurrency ranging from 1,728 to 216,000, performs better, uses a smaller absolute memory footprint, and consumes less communication bandwidth than the traditional, MPI-only implementation.

Howison, Mark; Bethel, E. Wes; Childs, Hank

2010-06-14T23:59:59.000Z

316

Methods of chemically converting first materials to second materials utilizing hybrid-plasma systems  

DOE Green Energy (OSTI)

In one aspect, the invention encompasses a method of chemically converting a first material to a second material. A first plasma and a second plasma are formed, and the first plasma is in fluid communication with the second plasma. The second plasma comprises activated hydrogen and oxygen, and is formed from a water vapor. A first material is flowed into the first plasma to at least partially ionize at least a portion of the first material. The at least partially ionized first material is flowed into the second plasma to react at least some components of the first material with at least one of the activated hydrogen and activated oxygen. Such converts at least some of the first material to a second material. In another aspect, the invention encompasses a method of forming a synthetic gas by flowing a hydrocarbon-containing material into a hybrid-plasma system. In yet another aspect, the invention encompasses a method of degrading a hydrocarbon-containing material by flowing such material into a hybrid-plasma system. In yet another aspect, the invention encompasses a method of releasing an inorganic component of a complex comprising the inorganic component and an other component, wherein the complex is flowed through a hybrid-plasma system.

Kong, Peter C. (Idaho Falls, ID); Grandy, Jon D. (Idaho Falls, ID)

2002-01-01T23:59:59.000Z

317

Small Hybrid Systems and Applications Testing at NREL's Outdoor Test Facility  

DOE Green Energy (OSTI)

The PV International Program at the National Renewable Energy Laboratory recently installed a small hybrid solar and wind energy system that could produce enough electricity to power a cabin or provide electricity in a remote village, without being connected to a utility grid. The solar system can provide 1,400 watts of power, and the wind turbine is rated at 900 watts when the wind is blowing at 28 miles per hour. The 48-volt system has eight batteries for storage. When the batteries are fully charged, the control system slows down the wind turbine so as not to overcharge the batteries. The turbine is mounted on a tilt-down, guyless, 30-foot tower that allows one person to easily lower and raise the machine for maintenance. A data acquisition system is being designed to monitor the individual outputs from the solar system and the wind system. The small hybrid system is housed in an insulated shed, the PV International Program's Test Building (ITB). The ITB contains electrical loads found in the average home, including a refrigerator, lights, heaters, air coolers, computers, and a radio.

Roybal, L.

2005-01-01T23:59:59.000Z

318

Stand-Alone Solar Electric Systems: The Earthscan Expert Handbook on Planning, Design and Installation  

Science Conference Proceedings (OSTI)

One of the best ways to get power to remote, off-grid locations, whether in developed or developing countries, is through the use of solar electric systems.This practical guide describes how to plan, design and install solar electric systems in a manner ...

Mark Hankins

2010-07-01T23:59:59.000Z

319

COMPARATIVE STUDY AMONG HYBRID GROUND SOURCE HEAT PUMP SYSTEM, COMPLETE GROUND SOURCE HEAT PUMP AND CONVENTIONAL HVAC SYSTEM  

DOE Green Energy (OSTI)

In this paper, a hotel with hybrid geothermal heat pump system (HyGSHP) in the Pensacola is selected and simulated by the transient simulation software package TRNSYS [1]. To verify the simulation results, the validations are conducted by using the monthly average entering water temperature, monthly facility consumption data, and etc. And three types of HVAC systems are compared based on the same building model and HVAC system capacity. The results are presented to show the advantages and disadvantages of HyGSHP compared with the other two systems in terms of energy consumptions, life cycle cost analysis.

Jiang Zhu; Yong X. Tao

2011-11-01T23:59:59.000Z

320

Modeling and Analysis of Hydraulic Energy Storage System for Hybrid Locomotives.  

E-Print Network (OSTI)

??Hybrid locomotive have more than one power source to provide driving power. The prime power source of a hybrid locomotive can be a diesel engine (more)

Zhang, Boya

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Evaluation of 2004 Toyota Prius Hybrid Electric Drive System Interim Report  

SciTech Connect

Laboratory tests were conducted to evaluate the electrical and mechanical performance of the 2004 Toyota Prius and its hybrid electric drive system. As a hybrid vehicle, the 2004 Prius uses both a gasoline-powered internal combustion engine and a battery-powered electric motor as motive power sources. Innovative algorithms for combining these two power sources results in improved fuel efficiency and reduced emissions compared to traditional automobiles. Initial objectives of the laboratory tests were to measure motor and generator back-electromotive force (emf) voltages and determine gearbox-related power losses over a specified range of shaft speeds and lubricating oil temperatures. Follow-on work will involve additional performance testing of the motor, generator, and inverter. Information contained in this interim report summarizes the test results obtained to date, describes preliminary conclusions and findings, and identifies additional areas for further study.

Ayers, C.W.

2004-11-23T23:59:59.000Z

322

Design and Analysis of Hybrid Solar Lighting and Full-Spectrum Solar Energy Systems  

DOE Green Energy (OSTI)

This paper describes a systems-level design and analysis of a new approach for improving the energy efficiency and affordability of solar energy in buildings, namely, hybrid solar lighting and full-spectrum solar energy systems. By using different portions of the solar spectrum simultaneously for multiple end-use applications in buildings, the proposed system offers unique advantages over other alternatives for using sunlight to displace electricity (conventional topside daylighting and solar technologies). Our preliminary work indicates that hybrid solar lighting, a method of collecting and distributing direct sunlight for lighting purposes, will alleviate many of the problems with passive daylighting systems of today, such as spatial and temporal variability, glare, excess illumination, cost, and energy efficiency. Similarly, our work suggests that the most appropriate use of the visible portion of direct, nondiffuse sunlight from an energy-savings perspective is to displace electric light rather than generate electricity. Early estimates detailed in this paper suggest an anticipated system cost of well under $2.0/Wp and 5-11 {cents}/kWh for displaced and generated electricity in single-story commercial building applications. Based on a number of factors discussed in the paper, including sunlight availability, building use scenarios, time-of-day electric utility rates, cost, and efficacy of the displaced electric lights, the simple payback of this approach in many applications could eventually be well under 5 years.

Muhs, J.D.

2001-06-19T23:59:59.000Z

323

Initial results from the operation of village hybrid systems in Chile  

DOE Green Energy (OSTI)

The government of Chile has undertaken a rural electrification program to electrify 75% of the population by the year 2000. Renewable energy is considered within this program, and its application facilitated through a technical cooperation agreement between Chile`s national energy commission (CNE) and the U.S. Department of Energy. In order to introduce isolated mini-grid hybrid wind-energy systems into Chile, three pilot projects were implemented in Region IX. The goal of the pilot systems is to establish renewables as a viable option for rural electrification in the Chilean context. In this paper we report on the first six months of three pilot projects. Presented as background information are brief descriptions of the power systems, data acquisition systems, and the operation and maintenance (O&M) protocols. Analyses of loads, component performance, system operation, and balance of payments for O&M are the primary points presented. Important lessons learned and future plans are also discussed.

Holz, R.; Baring-Gould, E.I.; Corbus, D. [and others

1997-08-01T23:59:59.000Z

324

Leveling Intermittent Renewable Energy Production Through Biomass Gasification-Based Hybrid Systems  

SciTech Connect

The increased use of intermittent renewable power in the United States is forcing utilities to manage increasingly complex supply and demand interactions. This paper evaluates biomass pathways for hydrogen production and how they can be integrated with renewable resources to improve the efficiency, reliability, dispatchability, and cost of other renewable technologies. Two hybrid concepts were analyzed that involve co-production of gaseous hydrogen and electric power from thermochemical biorefineries. Both of the concepts analyzed share the basic idea of combining intermittent wind-generated electricity with a biomass gasification plant. The systems were studied in detail for process feasibility and economic performance. The best performing system was estimated to produce hydrogen at a cost of $1.67/kg. The proposed hybrid systems seek to either fill energy shortfalls by supplying hydrogen to a peaking natural gas turbine or to absorb excess renewable power during low-demand hours. Direct leveling of intermittent renewable electricity production is accomplished with either an indirectly heated biomass gasifier, or a directly heated biomass gasifier. The indirect gasification concepts studied were found to be cost competitive in cases where value is placed on controlling carbon emissions. A carbon tax in the range of $26-40 per metric ton of CO{sub 2} equivalent (CO{sub 2}e) emission makes the systems studied cost competitive with steam methane reforming (SMR) to produce hydrogen. However, some additional value must be placed on energy peaking or sinking for these plants to be economically viable. The direct gasification concept studied replaces the air separation unit (ASU) with an electrolyzer bank and is unlikely to be cost competitive in the near future. High electrolyzer costs and wind power requirements make the hybridization difficult to justify economically without downsizing the system. Based on a direct replacement of the ASU with electrolyzers, hydrogen can be produced for $0.27 premium per kilogram. Additionally, if a non-renewable, grid-mix electricity is used, the hybrid system is found to be a net CO{sub 2}e emitter.

Dean, J.; Braun, R.; Penev, M.; Kinchin, C.; Munoz, D.

2010-01-01T23:59:59.000Z

325

Radiation Effects of n-type, Low Resistivity, Spiral Silicon Drift Detector Hybrid Systems  

Science Conference Proceedings (OSTI)

We have developed a new thin-window, n-type, low-resistivity, spiral silicon drift detector (SDD) array - to be used as an extraterrestrial X-ray spectrometer (in varying environments) for NASA. To achieve low-energy response, a thin SDD entrance window was produced using a previously developed method. These thin-window devices were also produced on lower resistivity, thinner, n-type, silicon material, effectively ensuring their radiation hardness in anticipation of operation in potentially harsh radiation environments (such as found around the Jupiter system). Using the Indiana University Cyclotron Facility beam line RERS1, we irradiated a set of suitable diodes up to 5 Mrad and the latest iteration of our ASICs up to 12 Mrad. Then we irradiated two hybrid detectors consisting of newly, such-produced in-house (BNL) SDD chips bonded with ASICs with doses of 0.25 Mrad and 1 Mrad. Also we irradiated another hybrid detector consisting of previously produced (by KETEK) on n-type, high-resistivity SDD chip bonded with BNL's ASICs with a dose of 1 Mrad. The measurement results of radiated diodes (up to 5 Mrad), ASICs (up to 12 Mrad) and hybrid detectors (up to 1 Mrad) are presented here.

Chen W.; De Geronimo G.; Carini, G.A.; Gaskin, J.A.; Keister, J.W.; Li, S.; Li, Z.; Ramsey, B.D.; Siddons, D.P.; Smith, G.C.; Verbitskaya, E.

2011-11-15T23:59:59.000Z

326

Self-learning control system for plug-in hybrid vehicles  

DOE Patents (OSTI)

A system is provided to instruct a plug-in hybrid electric vehicle how optimally to use electric propulsion from a rechargeable energy storage device to reach an electric recharging station, while maintaining as high a state of charge (SOC) as desired along the route prior to arriving at the recharging station at a minimum SOC. The system can include the step of calculating a straight-line distance and/or actual distance between an orientation point and the determined instant present location to determine when to initiate optimally a charge depleting phase. The system can limit extended driving on a deeply discharged rechargeable energy storage device and reduce the number of deep discharge cycles for the rechargeable energy storage device, thereby improving the effective lifetime of the rechargeable energy storage device. This "Just-in-Time strategy can be initiated automatically without operator input to accommodate the unsophisticated operator and without needing a navigation system/GPS input.

DeVault; Robert C. (Knoxville, TN)

2010-12-14T23:59:59.000Z

327

Costa de Cocos 11-kW wind-diesel hybrid system  

DOE Green Energy (OSTI)

Costa de Cocos is a small resort located in the state of Quintana Roo, Mexico. Using the existing diesel generator, the resort`s power system was retrofitted to a wind-hybrid diesel system. The reason for this retrofit was to supply 24-hour power, to reduce diesel fuel by using wind energy, and to reduce diesel air and noise emissions in order to promote ecotourism. The wind system was installed in October 1996 with cost-shared funding from the U.S. Department of Energy/U.S. Agency for International Development renewable energy program in Mexico. The National Renewable Energy Laboratory (NREL) supplied technical assistance to the project. Discussed in this paper are the system design, installation, and initial performance.

Corbus, D. [National Renewable Energy Lab., Golden, CO (United States); Bergey, M. [Bergey Windpower Co., Norman, OK (United States)

1997-09-01T23:59:59.000Z

328

Method of converting an existing vehicle powertrain to a hybrid powertrain system  

DOE Patents (OSTI)

A method of converting an existing vehicle powertrain including a manual transmission to a hybrid powertrain system with an automated powertrain transmission. The first step in the method of attaching a gear train housing to a housing of said manual transmission, said gear train housing receiving as end of drive shaft of said transmission and rotatably supporting a gear train assembly. Secondly, mounting an electric motor/generator to said gear train housing and attaching a motor/generator drive shaft of said electric motor/generator to said gear train assembly. Lastly, connecting an electro-mechanical clutch actuator to a friction clutch mechanism of said manual transmission.

Reed, Jr., Richard G. (Royal Oak, MI); Boberg, Evan S. (Hazel Park, MI); Lawrie, Robert E. (Whitmore Lake, MI); Castaing, Francois J. (Bloomfield Township, MI)

2001-12-25T23:59:59.000Z

329

Principles of passive and active cooling of mirror-based hybrid systems employing liquid metals  

SciTech Connect

This paper presents principles of passive and active cooling that are suitable to mirrorbased hybrid, nuclear fission/fusion systems. It is shown that liquid metal lead-bismuth cooling of the mirror machine with 25 m height and 1.5 GW thermal power is feasible both in the active mode during the normal operation and in the passive mode after the reactor shutdown. In the active mode the achievable required pumping power can well be below 50 MW, whereas the passive mode provides enough coolant flow to keep the clad temperature below the damage limits.

Anglart, Henryk [Div. of Nuclear Technology, School of Engineering Sciences, Royal Institute of Technology Roslagstullsbacken 21, 106-91 Stockholm (Sweden)

2012-06-19T23:59:59.000Z

330

Determining System Parameters for Optimal Performance of Hybrid DS/FFH Spread-Spectrum  

SciTech Connect

In recent years there has been great interest in using hybrid spread-spectrum (HSS) techniques for commercial applications, particularly in the Smart Grid, in addition to their use in military communications because they accommodate high data rates with high link integrity, even in the presence of significant multipath effects and interfering signals. A highly useful form of this transmission technique for many types of command, control, and sensing applications is the specific code-related combination of standard direct sequence (DS) modulation with "fast" frequency hopping (FFH), denoted hybrid DS/FFH, wherein multiple frequency hops occur within a single data-bit time. In this paper, an optimization problem is formulated that maximizes the DS/FFH communication system performance in terms of probability of bit error and solves for the system design parameters. The objective function is non-convex and can be solved by applying the Karush-Kuhn-Tucker conditions. System design parameters of interest are the length of the DS code sequence, number of frequency hopping channels, number of channels corrupted by wide-band jamming, and number of hops per bit. The proposed formulation takes into account the effects from wide-band and partial-band jamming, multi-user interference and/or varying degrees of Rayleigh and Rician multipath fading. Numerical results are presented to demonstrate the method s viability.

Ma, Xiao [ORNL; Olama, Mohammed M [ORNL; Kuruganti, Phani Teja [ORNL; Smith, Stephen Fulton [ORNL; Djouadi, Seddik M [ORNL

2012-01-01T23:59:59.000Z

331

Large Hybrid Energy Systems for Making Low CO2 Load-Following Power and Synthetic Fuel  

SciTech Connect

Hybrid energy systems using nuclear heat sources can economically produce load-following electrical power by exploiting the surplus generation capacity available at night or seasonally to make synthetic fuel. Vehicle fuel is the only current energy use large enough to absorb all the energy capacity that might be diverted from the power industry, and its ease of storage obviates problems with discontinuous synfuel production. The potential benefits and challenges of synfuels integration are illustrated by the production of methanol from natural gas (as a source of carbon) using steam from a light water nuclear power reactor which is assumed to be available in accord with a year's worth of power demand data. Methanol's synthesis process is easily adapted to using 300 C heat from a light water reactor and this simple compound can be further processed into gasoline, biodiesel, or dimethyl ether, fuels which can be used with the current vehicle fleet. A supplemental feed to the methanol process of natural gas (for energy) allows operation at constant full rate when the nuclear heat is being used to produce electrical power. The higher capital costs of such a system are offset by a lower cost of heat and power production from a large base load type of plant and by reduced costs associated with much lower CO2 emissions. Other less tangible economic benefits of this and similar hybrid systems include better use of natural resource for fuels and greater energy services security from the domestic production of vehicle fuel.

Robert S. Cherry; Richard D. Boardman; Steven Aumeier

2012-02-01T23:59:59.000Z

332

Load Sharing in a Hybrid Power System with a PV Panel and a PEM Fuel-Cell  

E-Print Network (OSTI)

varies with the time of the day. In order to improve the reliability of PV energy and at the same timeLoad Sharing in a Hybrid Power System with a PV Panel and a PEM Fuel-Cell Dachuan Yu S. Yuvarajan power system with PV panels and a PEM fuel cell is described. The system draws the maximum power

Yuvarajan, Subbaraya

333

200 kW, 800 MHz transmitter system for lower hybrid heating  

SciTech Connect

This paper describes a new rf heating system which has just been completed and is now operational on the ATC machine. The system utilizes four UHF TV klystrons to generate at least 200 kW of power at a frequency of 800 MHz. Pulse widths can be varied from 20 $mu$sec up to 20 msec. A radar type floating deck modulator along with photo-optical transmitting and receiving devices have been incorporated into the system to provide the pulse fidelity and versatility which characterizes this equipment. Modular construction was emphasized in the design, when possible, to reduce maintenance and down time in the advent of component falilure. Hybrid combining techniques are utilized in order to provide two 100 kW feeds into the machine. (auth)

Deitz, A.

1975-01-01T23:59:59.000Z

334

STATEMENT OF CONSIDERATIONS REQUEST BY HYBRID POWER GENERATION SYSTEMS, LLC, FOR AN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

UNDER UNDER DOE COOPERATIVE AGREEMENT NO. DE-FC26-01NT41245; W(A)-03-016, CH-1141 The Petitioner, Hybrid Power Generation Systems, LLC, a wholly owned subsidiary of General Electric Company (GE HPGS), was awarded this cooperative agreement for the performance of work entitled, "Solid State Energy Conversion Alliance (SECA) Solid Oxide Fuel Cell Program (SOFC)." The purpose of the cooperative agreement is to develop a fuel-flexible and modular system (3 to 10kW) that can serve as the basis for configuring and crating low-cost, highly efficient, and environmentally benign power plants tailored to specific markets. A second purpose is to assemble and test a packaged system based on the baseline design for a selected specified application and demonstrate cost projections and required operating characteristics.

335

High voltage bus and auxiliary heater control system for an electric or hybrid vehicle  

DOE Green Energy (OSTI)

A control system for an electric or hybrid electric vehicle includes a vehicle system controller and a control circuit having an electric immersion heater. The heater is electrically connected to the vehicle's high voltage bus and is thermally coupled to a coolant loop containing a heater core for the vehicle's climate control system. The system controller responds to cabin heat requests from the climate control system by generating a pulse width modulated signal that is used by the control circuit to operate the heater at a duty cycle appropriate for the amount of cabin heating requested. The control system also uses the heater to dissipate excess energy produced by an auxiliary power unit and to provide electric braking when regenerative braking is not desirable and manual braking is not necessary. The control system further utilizes the heater to provide a safe discharge of a bank of energy storage capacitors following disconnection of the battery or one of the high voltage connectors used to transmit high voltage operating power to the various vehicle systems. The control circuit includes a high voltage clamping circuit that monitors the voltage on the bus and operates the heater to clamp down the bus voltage when it exceeds a pre-selected maximum voltage. The control system can also be used to phase in operation of the heater when the bus voltage exceeds a lower threshold voltage and can be used to phase out the auxiliary power unit charging and regenerative braking when the battery becomes fully charged.

Murty, Balarama Vempaty (West Bloomfield, MI)

2000-01-01T23:59:59.000Z

336

MW-class hybrid power system based on planar solid oxide stack technology  

NLE Websites -- All DOE Office Websites (Extended Search)

Scale-Up of Planar SOFC Stack Scale-Up of Planar SOFC Stack Technology for MW-Level Combined Cycle System Final Report TIAX LLC Acorn Park Cambridge, Massachusetts 02140-2390 Reference: D0136 Submitted to NETL October 3, 2003 1 NETL-Hybrid Scale-UP/D0136/SS/V1 1 Executive Summary 2 Background, Objectives & Approach 3 SOFC Cell Geometry and Modeling 4 SOFC Power Scale-up 5 System Design and Costs 6 Conclusions & Recommendations A Appendix 2 NETL-Hybrid Scale-UP/D0136/SS/V1 Executive Summary SECA Strategy NETL wanted to understand if and how SECA-style anode-supported SOFC stacks could be scaled-up for use in MW-level combined cycle plants. * SECA strategy relies on the use of modular, mass produced, SOFC stacks in the 3 - 10 kW capacity range for a wide range of applications. * Technical feasibility small-scale applications has been evaluated by SECA:

337

Bus application of oxygen-enrichment technology and diesel-electric hybrid systems  

DOE Green Energy (OSTI)

The amendments to the Clean Air Act (CAA) mandate very strict limits on particulate, smoke, and other emissions from city buses. The use of alternative fuels, such as compressed natural gas (CNG) or methanol, can help transit operators, such as the Chicago Transit Authority (CTA), meet the mandated limits. However, the capital investment needed to convert the fueling infrastructure and buses is large, as is the expense of training personnel. If a {open_quotes}clean diesel{close_quotes} bus can be implemented with the help of oxygen-enrichment technology or a diesel-electric hybrid system, this large investment could be postponed for many years. The Regional Transportation Authority (RTA) initiated this project to evaluate the possibility of applying these technologies to CTA buses. Argonne National Laboratory (ANL) conducted a limited number of engine tests and computer analyses and concluded that both concepts are practical and will help in a {open_quotes}clean diesel{close_quotes} bus that can meet the mandated limits of the CAA amendments. The oxygen enrichment of combustion air depends on the availability of a compact and economical membrane separator. Because the technology for this critical component is still under development, it is recommended that an actual bus demonstration be delayed until prototype membranes are available. The hybrid propulsion system is ready for the demonstration phase, and it is recommended that the CTA and RTA commence planning for a bus demonstration.

Sekar, R.R.; Marr, W.W.

1993-10-01T23:59:59.000Z

338

Small geothermal electric systems for remote powering  

DOE Green Energy (OSTI)

This report describes conditions and costs at which quite small (100 to 1,000 kilowatt) geothermal systems could be used for off-grid powering at remote locations. This is a first step in a larger process of determining locations and conditions at which markets for such systems could be developed. The results suggest that small geothermal systems offer substantial economic and environmental advantages for powering off-grid towns and villages. Geothermal power is most likely to be economic if the system size is 300 kW or greater, down to reservoir temperatures of 100{degree}C. For system sizes smaller than 300 kW, the economics can be favorable if the reservoir temperature is about 120{degree}C or above. Important markets include sites remote from grids in many developing and developed countries. Estimates of geothermal resources in many developing countries are shown.

Entingh, Daniel J.; Easwaran, Eyob.; McLarty, Lynn

1994-08-08T23:59:59.000Z

339

Advanced Hybrid Propulsion and Energy Management System for High Efficiency, Off Highway, 240 Ton Class, Diesel Electric Haul Trucks  

DOE Green Energy (OSTI)

The objective of this project is to reduce the fuel consumption of off-highway vehicles, specifically large tonnage mine haul trucks. A hybrid energy storage and management system will be added to a conventional diesel-electric truck that will allow capture of braking energy normally dissipated in grid resistors as heat. The captured energy will be used during acceleration and motoring, reducing the diesel engine load, thus conserving fuel. The project will work towards a system validation of the hybrid system by first selecting an energy storage subsystem and energy management subsystem. Laboratory testing at a subscale level will evaluate these selections and then a full-scale laboratory test will be performed. After the subsystems have been proven at the full-scale lab, equipment will be mounted on a mine haul truck and integrated with the vehicle systems. The integrated hybrid components will be exercised to show functionality, capability, and fuel economy impacts in a mine setting.

Richter, Tim; Slezak, Lee; Johnson, Chris; Young, Henry; Funcannon, Dan

2008-12-31T23:59:59.000Z

340

Application of system safety framework in hybrid socio-technical environment of Eurasia  

E-Print Network (OSTI)

The political transformation and transition of post-Soviet societies have led to hybrid structures in political, economic and technological domains. In such hybrid structures the roles of government, state enterprise, ...

Abdymomunov, Azamat

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
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341

Evaluation of 2004 Toyota Prius Hybrid Electic Drive System Interim Report - Revised  

SciTech Connect

The 2004 Toyota Prius is a hybrid automobile equipped with a gasoline engine and a battery-powered electric motor. Both of these motive power sources are capable of providing mechanical drive power for the vehicle. The engine can deliver a peak power output of 57 kilowatts (kW) at 5000 revolutions per minute (rpm) while the motor can deliver a peak power output of 50 kW at 1300 rpm. Together, this engine-motor combination has a specified peak power output of 82 kW at a vehicle speed of 85 kilometers per hour (km/h). In operation, the 2004 Prius exhibits superior fuel economy compared to conventionally powered automobiles. Laboratory tests were conducted to evaluate the electrical and mechanical performance of the 2004 Toyota Prius and its hybrid electric drive system. As a hybrid vehicle, the 2004 Prius uses both a gasoline-powered internal combustion engine and a battery-powered electric motor as motive power sources. Innovative algorithms for combining these two power sources results in improved fuel efficiency and reduced emissions compared to traditional automobiles. Initial objectives of the laboratory tests were to measure motor and generator back-electromotive force (emf) voltages and determine gearbox-related power losses over a specified range of shaft speeds and lubricating oil temperatures. Follow-on work will involve additional performance testing of the motor, generator, and inverter. Information contained in this interim report summarizes the test results obtained to date, describes preliminary conclusions and findings, and identifies additional areas for further study.

Ayers, C.W.; Hsu, J.S.; Marlino, L.D.; Miller, C.W.; Ott, G.W., Jr.; Oland, C.B.; Burress, T.A.

2007-07-31T23:59:59.000Z

342

Energy Storage Systems Considerations for Grid-Charged Hybrid Electric Vehicles: Preprint  

DOE Green Energy (OSTI)

This paper calculates battery power and energy requirements for grid-charged hybrid electric vehicles (HEVs) with different operating strategies.

Markel, T.; Simpson, A.

2005-09-01T23:59:59.000Z

343

Prediction and Optimization of a Ceramic Casting Process Using A Hierarchical Hybrid System of Neural Networks and Fuzzy Logic  

E-Print Network (OSTI)

optimization for use in the ceramics industry. A prediction module estimates two quality metrics of slipPrediction and Optimization of a Ceramic Casting Process Using A Hierarchical Hybrid System)1 Department of Industrial and Systems Engineering Dunstan Hall Auburn University Auburn University

Smith, Alice E.

344

Hybrid space heating/cooling system with Trombe wall, underground venting, and assisted heat pump  

DOE Green Energy (OSTI)

Our goal was to design and monitor a hybrid solar system/ground loop which automatically assists the standard, thermostatically controlled home heating/cooling system. The input from the homeowner was limited to normal thermostat operations. During the course of the project it was determined that to effectively gather data and control the various component interactions, a micro-computer based control system would also allow the HVAC system to be optimized by simple changes to software. This flexibility in an untested concept helped us to achieve optimum system performance. Control ranged from direct solar heating and direct ground loop cooling modes, to assistance of the heat pump by both solar space and ground loop. Sensors were strategically placed to provide data on response of the Trombe wall (surface, 4 in. deep, 8 in. deep), and the ground loop (inlet, 3/4 length, outlet). Micro-computer hardware and computer programs were developed to make cost effective decisions between the various modes of operation. Although recent advances in micro-computer hardware make similar control systems more readily achievable utilizing standard components, attention to the decision making criteria will always be required.

Shirley, J.W.; James, L.C.; Stevens, S.; Autry, A.N.; Nussbaum, M.; MacQueen, S.V.

1983-06-22T23:59:59.000Z

345

Polygeneration system based on low temperature solid oxide fuel cell/micro gas turbine hybrid system.  

E-Print Network (OSTI)

?? Polygeneration systems attract attention recently because of their high efficiency and low emission compare to the conventional power generation technology. Three different polygeneration systems (more)

Samavati, Mahrokh

2012-01-01T23:59:59.000Z

346

Mesoscale hybrid calibration artifact  

DOE Patents (OSTI)

A mesoscale calibration artifact, also called a hybrid artifact, suitable for hybrid dimensional measurement and the method for make the artifact. The hybrid artifact has structural characteristics that make it suitable for dimensional measurement in both vision-based systems and touch-probe-based systems. The hybrid artifact employs the intersection of bulk-micromachined planes to fabricate edges that are sharp to the nanometer level and intersecting planes with crystal-lattice-defined angles.

Tran, Hy D. (Albuquerque, NM); Claudet, Andre A. (Albuquerque, NM); Oliver, Andrew D. (Waltham, MA)

2010-09-07T23:59:59.000Z

347

High voltage bus and auxiliary heater control system for an electric or hybrid vehicle  

DOE Patents (OSTI)

A control system for an electric or hybrid electric vehicle includes a vehicle system controller and a control circuit having an electric immersion heater. The heater is electrically connected to the vehicle's high voltage bus and is thermally coupled to a coolant loop containing a heater core for the vehicle's climate control system. The system controller responds to cabin heat requests from the climate control system by generating a pulse width modulated signal that is used by the control circuit to operate the heater at a duty cycle appropriate for the amount of cabin heating requested. The control system also uses the heater to dissipate excess energy produced by an auxiliary power unit and to provide electric braking when regenerative braking is not desirable and manual braking is not necessary. The control system further utilizes the heater to provide a safe discharge of a bank of energy storage capacitors following disconnection of the battery or one of the high voltage connectors used to transmit high voltage operating power to the various vehicle systems. The control circuit includes a high voltage clamping circuit that monitors the voltage on the bus and operates the heater to clamp down the bus voltage when it exceeds a pre-selected maximum voltage. The control system can also be used to phase in operation of the heater when the bus voltage exceeds a lower threshold voltage and can be used to phase out the auxiliary power unit charging and regenerative braking when the battery becomes fully charged.

Murty, Balarama Vempaty (West Bloomfield, MI)

2000-01-01T23:59:59.000Z

348

DEMONSTRATION OF A HYBRID INTELLIGENT CONTROL STRATEGY FOR CRITICAL BUILDING HVAC SYSTEMS  

SciTech Connect

Many industrial facilities utilize pressure control gradients to prevent migration of hazardous species from containment areas to occupied zones, often using Proportional-Integral-Derivative (PID) control. Within these facilities, PID control is often inadequate to maintain desired performance due to changing operating conditions. As the goal of the Heating, Ventilation and Air-Conditioning (HVAC) control system is to optimize the pressure gradients and associated flows for the plant, Linear Quadratic Tracking (LQT) provides a time-based approach to guiding plant interactions. However, LQT methods are susceptible to modeling and measurement errors, and therefore a hybrid design using the integration of soft control methods with hard control methods is developed and demonstrated to account for these errors and nonlinearities.

Craig Rieger; D. Subbaram Naidu

2010-06-01T23:59:59.000Z

349

Method and apparatus for effecting light-off of a catalytic converter in a hybrid powertrain system  

SciTech Connect

A powertrain system includes a hybrid transmission and an internal combustion engine coupled to an exhaust aftertreatment device. A method for operating the powertrain system includes operating the hybrid transmission to generate tractive torque responsive to an operator torque request with the internal combustion engine in an engine-off state so long as the tractive torque is less than a threshold. The internal combustion engine is operated in an engine-on state at preferred operating conditions to effect light-off of the exhaust aftertreatment device and the hybrid transmission is coincidentally operated to generate tractive torque responsive to the operator torque request when the operator torque request exceeds the threshold. The internal combustion engine is then operated in the engine-on state to generate tractive torque responsive to the operator torque request.

Roos, Bryan Nathaniel; Spohn, Brian L

2013-07-02T23:59:59.000Z

350

Final LDRD report human interaction with complex systems: advances in hybrid reachability and control.  

SciTech Connect

This document describes new advances in hybrid reachability techniques accomplished during the course of a one-year Truman Postdoctoral Fellowship. These techniques provide guarantees of safety in complex systems, which is especially important in high-risk, expensive, or safety-critical systems. My work focused on new approaches to two specific problems motivated by real-world issues in complex systems: (1) multi-objective controller synthesis, and (2) control for recovery from error. Regarding the first problem, a novel application of reachability analysis allowed controller synthesis in a single step to achieve (a) safety, (b) stability, and (c) prevent input saturation. By extending the state to include the input parameters, constraints for stability, saturation, and envelope protection are incorporated into a single reachability analysis. Regarding the second problem, a new approach to the problem of recovery provides (a) states from which recovery is possible, and (b) controllers to guide the system during a recovery maneuver from an error state to a safe state in minimal time. Results are computed in both problems on nonlinear models of single longitudinal aircraft dynamics and two-aircraft lateral collision avoidance dynamics.

Oishi, Meeko M.

2006-08-01T23:59:59.000Z

351

Wales, Alaska High Penetration Wind-Diesel Hybrid Power System: Theory of Operation  

Science Conference Proceedings (OSTI)

To reduce the cost of rural power generation and the environmental impact of diesel fuel usage, the Alaska Energy Authority (AEA), Kotzebue Electric Association (KEA, a rural Alaskan utility), and the National Renewable Energy Laboratory (NREL), began a collaboration in late 1995 to implement a high-penetration wind-diesel hybrid power system in a village in northwest Alaska. The project was intended to be both a technology demonstration and a pilot for commercial replication of the system in other Alaskan villages. During the first several years of the project, NREL focused on the design and development of the electronic controls, the system control software, and the ancillary components (power converters, energy storage, electric dump loads, communications links, etc.) that would be required to integrate new wind turbines with the existing diesels in a reliable highly automated system. Meanwhile, AEA and KEA focused on project development activities, including wind resource assessment, site selection and permitting, community relationship building, and logistical planning. Ultimately, the village of Wales, Alaska, was chosen as the project site. Wales is a native Inupiat village of approximately 160 inhabitants, with an average electric load of about 75 kW.

Drouilhet, S.; Shirazi, M.

2002-05-01T23:59:59.000Z

352

FreedomCAR :electrical energy storage system abuse test manual for electric and hybrid electric vehicle applications.  

DOE Green Energy (OSTI)

This manual defines a complete body of abuse tests intended to simulate actual use and abuse conditions that may be beyond the normal safe operating limits experienced by electrical energy storage systems used in electric and hybrid electric vehicles. The tests are designed to provide a common framework for abuse testing various electrical energy storage systems used in both electric and hybrid electric vehicle applications. The manual incorporates improvements and refinements to test descriptions presented in the Society of Automotive Engineers Recommended Practice SAE J2464 ''Electric Vehicle Battery Abuse Testing'' including adaptations to abuse tests to address hybrid electric vehicle applications and other energy storage technologies (i.e., capacitors). These (possibly destructive) tests may be used as needed to determine the response of a given electrical energy storage system design under specifically defined abuse conditions. This manual does not provide acceptance criteria as a result of the testing, but rather provides results that are accurate and fair and, consequently, comparable to results from abuse tests on other similar systems. The tests described are intended for abuse testing any electrical energy storage system designed for use in electric or hybrid electric vehicle applications whether it is composed of batteries, capacitors, or a combination of the two.

Doughty, Daniel Harvey; Crafts, Chris C.

2006-08-01T23:59:59.000Z

353

Modeling, Control and Prototyping of Alternative Energy Storage Systems for Hybrid Vehicles.  

E-Print Network (OSTI)

??Electrochemical batteries are typically considered for secondary energy storage device on hybrid vehicles. Still other forms of energy storage are receiving considerable interest today. In (more)

Samuel Durair Raj, Kingsly Jebakumar

2012-01-01T23:59:59.000Z

354

System Modeling and Energy Management Strategy Development for Series Hybrid Vehicles .  

E-Print Network (OSTI)

??A series hybrid electric vehicle is a vehicle that is powered by both an engine and a battery pack. An electric motor provides all of (more)

Cross, Patrick Wilson

2008-01-01T23:59:59.000Z

355

Hybrid energy storage systems based on compressed air and supercapacitors with maximum efficiency point tracking  

E-Print Network (OSTI)

This paper presents a hybrid energy storage system based on Compressed Air Energy Storage (CAES), where the charging and discharging is done within maximum efficiency conditions. As the maximum efficiency conditions impose the level of converted power, an intermittent time-modulated operation mode is applied to the thermodynamic converter to obtain a variable converted power. A smoothly variable output power is achieved with the help of a supercapacitive auxiliary storage device used as a filter. The paper describes the concept of the system, the power-electronic interface circuits and especially the Maximum Efficiency Point Tracking (MEPT) algorithm and the strategy used to vary the output power. In addition, the paper will present the characteristics of a high efficiency storage device where the pure pneumatic machine is replaced by an oil-hydraulics and pneumatics converter, used under isothermal conditions. Practical results are also presented, recorded from a low-power pneumatic motor coupled to a small DC generator, as well as from a first prototype of the final hydraulic/pneumatic system.

Sylvain Lemofouet; Alfred Rufer

2005-01-01T23:59:59.000Z

356

Ammonia Production and Utilization in a Hybrid LNT+SCR System  

DOE Green Energy (OSTI)

A hybrid LNT+SCR system is used to control NOx from a light-duty diesel engine with in-cylinder regeneration controls. A diesel oxidation catalyst and diesel particulate filter are upstream of the LNT and SCR catalysts. Ultraviolet (UV) adsorption spectroscopy performed directly in the exhaust path downstream of the LNT and SCR catalysts is used to characterize NH3 production and utilization in the system. Extractive exhaust samples are analyzed with FTIR and magnetic sector mass spectrometry (H2) as well. Furthermore, standard gas analyzers are used to complete the characterization of exhaust chemistry. NH3 formation increases strongly with extended regeneration (or over regeneration ) of the LNT, but the amount of NOx reduction occurring over the SCR catalyst is limited by the amount of NH3 produced as well as the amount of NOx available downstream of the LNT. Control of lean-rich cycling parameters enables control of the ratio of NOx reduction between the LNT and SCR catalysts. During lean-rich cycling, fuel penalties are similar for either LNT dominant or LNT with supplemental SCR NOx reduction. However, stored NH3 after multiple lean-rich cycles can enable continued NOx reduction by the SCR after lean-rich cycling stops; thus, requirements for active regeneration of the LNT+SCR system can be modified during transient operation.

Prikhodko, Vitaly Y [ORNL; Parks, II, James E [ORNL

2009-01-01T23:59:59.000Z

357

2 15.10.2013 Van D. BaxterVolker Weinmann Hybrid heat pump system as chance for the  

E-Print Network (OSTI)

pumps Condensing gas and oil boilers DHW tanks Solar panels Under floor heating Installation equipment condsing Oil non condensing Heat pumps Biomass 612.500638.000550.000 618.500762.000751.500 735#12;2 15.10.2013 Van D. BaxterVolker Weinmann Hybrid heat pump system as chance for the renovation

Oak Ridge National Laboratory

358

Application of a new hybrid neuro-evolutionary system for day-ahead price forecasting of electricity markets  

Science Conference Proceedings (OSTI)

In this paper, a new forecast strategy is proposed for day-ahead prediction of electricity prices, which are so valuable for both producers and consumers in the new competitive electric power markets. However, electricity price has a nonlinear, volatile ... Keywords: Evolutionary algorithm, Hybrid neuro-evolutionary system, Neural network, Price forecast

Nima Amjady; Farshid Keynia

2010-06-01T23:59:59.000Z

359

Dual-Mode Hybrid/Two-Mode Hybrid Accomplishment  

NLE Websites -- All DOE Office Websites (Extended Search)

Dual-Mode Hybrid/Two-Mode Hybrid Accomplishment Dual-Mode Hybrid/Two-Mode Hybrid Accomplishment DOE-funded research, in collaboration with Allison Buses and General Motors Corporation has led to the commercialization of a dramatically different hybrid transmission system for heavy-duty and light-duty applications. The Dual-Mode or Two-Mode hybrid system is an infinitely variable speed hybrid transmission that works with the engine and battery system and automatically chooses to operate in a parallel or series hybrid path to maximize efficiency and minimize emissions, fuel consumption and noise. Parallel and Series hybrid configurations are found on most hybrid vehicles today, both with their own pluses and minuses. The Dual- Mode/Two-Mode systems uses the positive characteristics from both systems to maximize fuel

360

Performance of hybrid quad generation system consisting of solid oxide fuel cell system and  

E-Print Network (OSTI)

or tri-generation systems. Specifically, it suits better for applications, such food industry, where.1 Background The existing cogeneration (e.g. heat and power) and trigeneration (e.g. heating, cooling and power to decrease the primary energy consumption [1]. The trigeneration systems derive from those for cogeneration

Liso, Vincenzo

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

MODEL AND ALGORITHM EVALUATION FOR THE HYBRID UF6 CONTAINER INSPECTION SYSTEM  

Science Conference Proceedings (OSTI)

ABSTRACT Pacific Northwest National Laboratory (PNNL) is developing an automated UF6 cylinder verification station concept based on the combined collection of traditional enrichment-meter (186 keV photons from U-235) data and non-traditional, neutron-induced, high-energy gamma-signatures (3-8.5 MeV) with an array of collimated, medium-resolution scintillators. Previous (2010) work at PNNL demonstrated proof-of-principle that this hybrid method yields accurate, full-volume assay of the cylinder enrichment, reduces systematic errors when compared to several other enrichment assay methods, and provides simplified instrumentation and algorithms suitable for long-term unattended operations. We used Monte Carlo modeling with MCNP5 to support system design (e.g., number and configuration of detector arrays, and design of iron/poly collimators for enhanced (n,?) conversion) and enrichment algorithm development. We developed a first-generation modeling framework in 2010. These tools have since been expanded, refined and benchmarked against field measurements with a prototype system of a 30B cylinder population (0.2 to 4.95 weight % U-235). The MCNP5 model decomposes the radiation transport problem into a linear superposition of basis spectra representing contributions from the different uranium isotopes and gamma-ray generation mechanisms (e.g. neutron capture). This scheme accommodates fast generation of virtual assay signatures for arbitrary enrichment, material age, and fill variations. Ongoing (FY-2011) refinements to the physics model include accounting for generation of bremsstrahlung photons, arising primarily from the beta decay of Pa-234m, a U-238 daughter. We are using the refined model to optimize collimator design for the hybrid method. The traditional assay method benefits from a high degree of collimation (to isolate each detectors field-of-view) and relatively small detector area, while the non-traditional method benefits from a wide field-of-view, i.e. less collimation and larger detectors. We implement the enrichment-meter method by applying a square-wave digital filter to a raw spectrum and extracting the 186-keV peak area directly from the convolute spectrum. Ongoing enhancements to this approach include mitigating a systematic peak-area measurement deficit arising from curvature in the spectrum continuum shape. An optimized system prototype based on model results is utilized in a new set of 2011 field measurements, and model and measurement enrichment assay uncertainties are compared.

McDonald, Benjamin S.; Jordan, David V.; Orton, Christopher R.; Mace, Emily K.; Smith, Leon E.; Wittman, Richard S.

2011-06-14T23:59:59.000Z

362

FUTURA: Hybrid System for Electric Load Forecasting by Using Case-Based Reasoning and Expert System  

Science Conference Proceedings (OSTI)

The results of combining a numeric extrapolation of data with the methodology of case-based reasoning and expert systems in order to improve the electric load forecasting are presented in this contribution. Registers of power consumption are stored as ...

Ral Vilcahuamn; Joaquim Melndez; Josep Lluis de la Rosa

2002-10-01T23:59:59.000Z

363

A Novel Integrated Magnetic Structure Based DC/DC Converter for Hybrid Battery/Ultracapacitor Energy Storage Systems  

Science Conference Proceedings (OSTI)

This manuscript focuses on a novel actively controlled hybrid magnetic battery/ultracapacitor based energy storage system (ESS) for vehicular propulsion systems. A stand-alone battery system might not be sufficient to satisfy peak power demand and transient load variations in hybrid and plug-in hybrid electric vehicles (HEV, PHEV). Active battery/ultracapacitor hybrid ESS provides a better solution in terms of efficient power management and control flexibility. Moreover, the voltage of the battery pack can be selected to be different than that of the ultracapacitor, which will result in flexibility of design as well as cost and size reduction of the battery pack. In addition, the ultracapacitor bank can supply or recapture a large burst of power and it can be used with high C-rates. Hence, the battery is not subjected to supply peak and sharp power variations, and the stress on the battery will be reduced and the battery lifetime would be increased. Utilizing ultracapacitor results in effective capturing of the braking energy, especially in sudden braking conditions.

Onar, Omer C [ORNL

2012-01-01T23:59:59.000Z

364

Analysis of the Performance Benefits of Short-Term Energy Storage in Wind-Diesel Hybrid Power Systems  

Science Conference Proceedings (OSTI)

A variety of prototype high penetration wind-diesel hybrid power systems have been implemented with different amounts of energy storage. They range from systems with no energy storage to those with many hours worth of energy storage. There has been little consensus among wind-diesel system developers as to the appropriate role and amount of energy storage in such systems. Some researchers advocate providing only enough storage capacity to supply power during the time it takes the diesel genset to start. Others install large battery banks to allow the diesel(s) to operate at full load and/or to time-shift the availability of wind-generated electricity to match the demand. Prior studies indicate that for high penetration wind-diesel systems, short-term energy storage provides the largest operational and economic benefit. This study uses data collected in Deering, Alaska, a small diesel-powered village, and the hybrid systems modeling software Hybrid2 to determine the optimum amount of short-term storage for a particular high penetration wind-diesel system. These findings were then generalized by determining how wind penetration, turbulence intensity, and load variability affect the value of short term energy storage as measured in terms of fuel savings, total diesel run time, and the number of diesel starts.

Shirazi, M.; Drouilhet, S.

1997-04-01T23:59:59.000Z

365

Testing of a 50-kW wind-diesel hybrid system at the National Wind Technology Center  

DOE Green Energy (OSTI)

To further the development of commercial hybrid power systems, the National Renewable Energy Laboratory (NREL), in collaboration with the New World Village Power Corporation (NWVP), tested a NWVP 50-kW wind-diesel hybrid system connected to a 15/50 Atlantic Orient Corporation (AOC) wind turbine. Testing was conducted from October 1995 through March 1996 at the National Wind Technology Center (NWTC). A main objective of the testing was to better understand the application of wind turbines to weak grids typical of small villages. Performance results contained in this paper include component characterization, such as power conversion losses for the rotary converter systems and battery round trip efficiencies. In addition, systems operation over this period is discussed with special attention given to dynamic issues. Finally, future plans for continued testing and research are discussed.

Corbus, D.A.; Green, J.; Allderdice, A.; Rand, K.; Bianchi, J. [National Renewable Energy Lab., Golden, CO (United States); Linton, E. [New World Village Power, Waitsfield, VT (United States)

1996-07-01T23:59:59.000Z

366

Hybrid photovoltaic/thermal (PV/T) solar systems simulation with Simulink/Matlab  

Science Conference Proceedings (OSTI)

The purpose of this work consists in thermodynamic modeling of hybrid photovoltaic-thermal (PV/T) solar systems, pursuing a modular strategy approach provided by Simulink/Matlab. PV/T solar systems are a recently emerging solar technology that allows for the simultaneous conversion of solar energy into both electricity and heat. This type of technology present some interesting advantages over the conventional ''side-by-side'' thermal and PV solar systems, such as higher combined electrical/thermal energy outputs per unit area, and a more uniform and aesthetical pleasant roof area. Despite the fact that early research on PV/T systems can be traced back to the seventies, only recently it has gained a renewed impetus. In this work, parametric studies and annual transient simulations of PV/T systems are undertaken in Simulink/Matlab. The obtained results show an average annual solar fraction of 67%, and a global overall efficiency of 24% (i.e. 15% thermal and 9% electrical), for a typical four-person single-family residence in Lisbon, with p-Si cells, and a collector area of 6 m{sup 2}. A sensitivity analysis performed on the PV/T collector suggests that the most important variable that should be addressed to improve thermal performance is the photovoltaic (PV) module emittance. Based on those results, some additional improvements are proposed, such as the use of vacuum, or a noble gas at low-pressure, to allow for the removal of PV cells encapsulation without air oxidation and degradation, and thus reducing the PV module emittance. Preliminary results show that this option allows for an 8% increase on optical thermal efficiency, and a substantial reduction of thermal losses, suggesting the possibility of working at higher fluid temperatures. The higher working temperatures negative effect in electrical efficiency was negligible, due to compensation by improved optical properties. The simulation results are compared with experimental data obtained from other authors and perform reasonably well. The Simulink modeling platform has been mainly used worldwide on simulation of control systems, digital signal processing and electric circuits, but there are very few examples of application to solar energy systems modeling. This work uses the modular environment of Simulink/Matlab to model individual PV/T system components, and to assemble the entire installation layout. The results show that the modular approach strategy provided by Matlab/Simulink environment is applicable to solar systems modeling, providing good code scalability, faster developing time, and simpler integration with external computational tools, when compared with traditional imperative-oriented programming languages. (author)

da Silva, R.M.; Fernandes, J.L.M. [Department of Mechanical Engineering, Instituto Superior Tecnico, Lisbon (Portugal)

2010-12-15T23:59:59.000Z

367

Feasibility Study for Photovoltaics, Wind, solar Hot Water and Hybrid Systems  

DOE Green Energy (OSTI)

Southwestern Indian Polytechnic Institute (SIPI) located in Albuquerque New Mexico is a community college that serves American Indians and Alaska Natives. SIPIs student body represents over 100 Native American Tribes. SIPI completed a renewable energy feasibility study program and established renewable energy hardware on the SIPI campus, which supplements and creates an educational resource to teach renewable energy courses. The SIPI campus is located, and has as student origins, areas, in which power is an issue in remote reservations. The following hardware was installed and integrated into the campus facilities: small wind turbine, large photovoltaic array that is grid-connected, two photovoltaic arrays, one thin film type, and one polycrystalline type, one dual-axis active tracker and one passive tracker, a hot air system for heating a small building, a portable hybrid photovoltaic system for remote power, and a hot water system to preheat water used in the SIPI Child Care facility. Educational curriculum has been developed for two renewable energy courses one being the study of energy production and use, and especially the roles renewable energy forms like solar, wind, geothermal, hydro, and biomass plays, and the second course being a more advanced in-depth study of renewable energy system design, maintenance, installation, and applications. Both courses rely heavily on experiential learning techniques so that installed renewable energy hardware is continuously utilized in hand-on laboratory activities and are part of the Electronics program of studies. Renewable energy technologies and science has also been included in other SIPI programs of study such as Environmental Science, Natural Resources, Agriculture, Engineering, Network Management, and Geospatial Technology.

Hooks, Ronald; Montoya, Valerie

2008-03-26T23:59:59.000Z

368

Power and phase monitoring system for the lower hybrid phased array heating system on ATC machine  

SciTech Connect

A four waveguide phased array slow wave structure has been constructed to couple microwave energy into plasma in the ATC Tokamac at Princeton. Theory has indicated that the coupling of power into the plasma column is a strong function of the imposed fourier spectrum at the antenna aperture. To optimize heating, and to verify theoretical results, a precision amplitude and phase monitoring system has been designed and constructed. The system data output is routed to an IBM 1800 computer where the fourier spectrum in n/sub parallel/ space is computed for discrete increments of time during an RF pulse. Computer output data is used to update the adjustment of transmission line parameters in between pulses. (auth)

Reed, B.W.

1975-01-01T23:59:59.000Z

369

Digestion of frozen/thawed food waste in the hybrid anaerobic solid-liquid system  

SciTech Connect

The hybrid anaerobic solid-liquid (HASL) system, which is a modified two-phase anaerobic digester, is to be used in an industrial scale operation to minimize disposal of food waste at incineration plants in Singapore. The aim of the present research was to evaluate freezing/thawing of food waste as a pre-treatment for its anaerobic digestion in the HASL system. The hydrolytic and fermentation processes in the acidogenic reactor were enhanced when food waste was frozen for 24 h at -20 deg. C and then thawed for 12 h at 25 deg. C (experiment) in comparison with fresh food waste (control). The highest dissolved COD concentrations in the leachate from the acidogenic reactors were 16.9 g/l on day 3 in the control and 18.9 g/l on day 1 in the experiment. The highest VFA concentrations in the leachate from the acidogenic reactors were 11.7 g/l on day 3 in the control and 17.0 g/l on day 1 in the experiment. The same volume of methane was produced during 12 days in the control and 7 days in the experiment. It gave the opportunity to diminish operational time of batch process by 42%. The effect of freezing/thawing of food waste as pre-treatment for its anaerobic digestion in the HASL system was comparable with that of thermal pre-treatment of food waste at 150 deg. C for 1 h. However, estimation of energy required either to heat the suspended food waste to 150 deg. C or to freeze the same quantity of food waste to -20 deg. C showed that freezing pre-treatment consumes about 3 times less energy than thermal pre-treatment.

Stabnikova, O. [School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)], E-mail: costab@ntu.edu.sg; Liu, X.Y.; Wang, J.Y. [School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)

2008-07-01T23:59:59.000Z

370

A decision support technique for the design of hybrid solar-wind power systems  

SciTech Connect

This paper presents a decision support technique to help decision makers study the influencing factors in the design of a hybrid solar-wind power system (HSWPS) for grid-linked applications. These factors relate mainly to political and social conditions, and to technical advances and economics. The Analytic Hierarchy Process (AHP) is used to quantify the various divergencies of opinions, practices and events that lead to confusion and uncertainties in planning HSWPS. The trade-off/risk method is used to generate multiple plans under 16 different futures and obtain the corresponding trade-off curves. Unlike the traditional 2-D simulation, a novel modeling of a trade-off surface in 3-D space is presented where the knee set is determined using the minimum distance approach. Robust and inferior plans are segregated based on their frequent occurrence din the conditional decision set of each future and hedging analysis to reduce risk is performed in order to assign alternative options in case risky futures occur.

Chedid, R.; Akiki, H. [American Univ. of Beirut, New York, NY (United States). Dept. of Electrical and Computer Engineering] [American Univ. of Beirut, New York, NY (United States). Dept. of Electrical and Computer Engineering; Rahman, S. [Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Center for Energy and the Global Environment] [Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Center for Energy and the Global Environment

1998-03-01T23:59:59.000Z

371

Optimal control of remote hybrid power systems. Part 1: Simplified model  

SciTech Connect

In this two-part study, time-series models are used to determine optimal dispatch strategies, in conjunction with optimally-sized components, in remote hybrid power systems. The objective of the dispatch optimization is to minimize the costs associated with diesel fuel, diesel starts, and battery erosion, based on a thorough economic analysis of present worth life-cycle cost. An ideal predictive control strategy is used as a basis of comparison. In Part 1 (reported here), a simplified time-series model is used to obtain preliminary conceptual results. These results illustrate the nature of the optimal dispatch strategy and indicate that a simple SOC setpoint strategy can be practically as effective as the ideal predictive control. In Part 2 (at a later date), a more detailed model will be used to obtain more accurate, quantitative results. The authors anticipate that these results will be correlated to dimensionless economic, design, and performance parameters, rendering them useful as design guidelines over a wide variety of load profiles, climates, equipment specifications, and economic variables.

Barley, C D [Colorado State Univ., Fort Collins, CO (United States). Mechanical Engineering Dept.; [National Renewable Energy Lab., Golden, CO (United States). Wind Technology Div.; Winn, C B [Colorado State Univ., Fort Collins, CO (United States); Flowers, L; Green, H J [National Renewable Energy Lab., Golden, CO (United States). Wind Technology Div.

1995-04-01T23:59:59.000Z

372

Automatic Mesh Adaptivity for Hybrid Monte Carlo/Deterministic Neutronics Modeling of Fusion Energy Systems  

SciTech Connect

Three mesh adaptivity algorithms were developed to facilitate and expedite the use of the CADIS and FW-CADIS hybrid Monte Carlo/deterministic techniques in accurate full-scale neutronics simulations of fusion energy systems with immense sizes and complicated geometries. First, a macromaterial approach enhances the fidelity of the deterministic models without changing the mesh. Second, a deterministic mesh refinement algorithm generates meshes that capture as much geometric detail as possible without exceeding a specified maximum number of mesh elements. Finally, a weight window coarsening algorithm decouples the weight window mesh and energy bins from the mesh and energy group structure of the deterministic calculations in order to remove the memory constraint of the weight window map from the deterministic mesh resolution. The three algorithms were used to enhance an FW-CADIS calculation of the prompt dose rate throughout the ITER experimental facility and resulted in a 23.3% increase in the number of mesh tally elements in which the dose rates were calculated in a 10-day Monte Carlo calculation. Additionally, because of the significant increase in the efficiency of FW-CADIS simulations, the three algorithms enabled this difficult calculation to be accurately solved on a regular computer cluster, eliminating the need for a world-class super computer.

Ibrahim, Ahmad M [ORNL; Wilson, P. [University of Wisconsin; Sawan, M. [University of Wisconsin; Mosher, Scott W [ORNL; Peplow, Douglas E. [ORNL; Grove, Robert E [ORNL

2013-01-01T23:59:59.000Z

373

Design of hybrid optio-vision tracking system with active RFID  

E-Print Network (OSTI)

An investigation in current RFID technology with an envision design of a hybrid setup with Active RFID and camera technology. Current Active RFID technologies focus on dynamic mesh networks with complex functionality on ...

Hilton, Eric, S. B. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

374

Design and Control of the Propulsion System of a Series Hybrid Electric Vehicle  

Science Conference Proceedings (OSTI)

Hybrid Electric Vehicles, HEV, are an attractive opportunity to use new energy sources in road transportation, not only to minimize fuel consumption but also to reduce air pollution. Efforts are being made to improve the HEV electrical subsystems, such ...

Patricia Caratozzolo; Manuel Canseco

2006-09-01T23:59:59.000Z

375

Hybrid Parallelism for Volume Rendering on Large, Multi- and Many-core Systems  

SciTech Connect

With the computing industry trending towards multi- and many-core processors, we study how a standard visualization algorithm, ray-casting volume rendering, can benefit from a hybrid parallelism approach. Hybrid parallelism provides the best of both worlds: using distributed-memory parallelism across a large numbers of nodes increases available FLOPs and memory, while exploiting shared-memory parallelism among the cores within each node ensures that each node performs its portion of the larger calculation as efficiently as possible. We demonstrate results from weak and strong scaling studies, at levels of concurrency ranging up to 216,000, and with datasets as large as 12.2 trillion cells. The greatest benefit from hybrid parallelism lies in the communication portion of the algorithm, the dominant cost at higher levels of concurrency. We show that reducing the number of participants with a hybrid approach significantly improves performance.

Howison, Mark; Bethel, E. Wes; Childs, Hank

2011-01-01T23:59:59.000Z

376

Heavy vehicle hybrid propulsion systems R and D program plan, FY 2000-2005  

DOE Green Energy (OSTI)

This report contains the program plan and background information for the Heavy Vehicle Hybrid Propulsion R and D Program sponsored by the Department of Energy's Office of Heavy Vehicle Technologies. The program is a collaboration between industry and government established for the development of advanced hybrid-electric propulsion technology for urban cycle trucks and buses. It targets specific applications to enhance potential market success. Potential end-users are also involved.

None

2000-07-01T23:59:59.000Z

377

Power management strategy based on adaptive neuro-fuzzy inference system for fuel cell-battery hybrid vehicle  

Science Conference Proceedings (OSTI)

A power management strategy based on an adaptive neuro-fuzzy inference system is proposed to enhance the fuel economy of fuel cell-battery hybrid vehicle and increase the mileage of continuation of journey. The model of hybrid vehicle for fuel cell-battery structure is developed by electric vehicle simulation software advisor. The simulation results demonstrate that the proposed strategy can satisfy the power requirement of four standard drive cycles and achieve the power distribution between fuel cell system and battery. The comprehensive comparisons with a power tracking control strategy which is widely adopted in advisor verify that the proposed strategy has better validity in terms of fuel economy in four standard drive cycles. Hence

Qi Li; Weirong Chen; Shukui Liu; Zhiyu You; Shiyong Tao; Yankun Li

2012-01-01T23:59:59.000Z

378

Program on Technology Innovation: Feasibility Study of Using a Thermosyphon Cooler Hybrid System to Reduce Cooling Tower Water Consu mption  

Science Conference Proceedings (OSTI)

This Technical Update describes the initial work accomplished by a feasibility study for using a newly developed Thermosyphon Cooler (TSC) Hybrid System to reduce cooling-tower water consumption at steam power plants. The report outlines the overall project and then details the applicable codes and standards that would apply to this technology. It also briefly touches on the literature and patents relating to this field. It describes the rationale and constraints involved in setting up the ...

2012-11-19T23:59:59.000Z

379

Product Quality Assurance for Off-Grid Lighting in Africa  

E-Print Network (OSTI)

Jeffrey Miller Pivotal Lighting Design 1601 Fifth Avenueaffordable, sustainable, lighting available to the millionsable to realize modern lighting options. R; Doluweera Peon,

Mills, Evan; World Bank

2008-01-01T23:59:59.000Z

380

Product Quality Assurance for Off-Grid Lighting in Africa  

E-Print Network (OSTI)

and stunting the market. Solar PV market experiences inabout 10-15 commonly available solar PV, DC recharging, gridoverview of available PV Solar Lanterns in the market (

Mills, Evan; World Bank

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Laser Intertial Fusion Energy: Neutronic Design Aspects of a Hybrid Fusion-Fission Nuclear Energy System  

SciTech Connect

This study investigates the neutronics design aspects of a hybrid fusion-fission energy system called the Laser Fusion-Fission Hybrid (LFFH). A LFFH combines current Laser Inertial Confinement fusion technology with that of advanced fission reactor technology to produce a system that eliminates many of the negative aspects of pure fusion or pure fission systems. When examining the LFFH energy mission, a significant portion of the United States and world energy production could be supplied by LFFH plants. The LFFH engine described utilizes a central fusion chamber surrounded by multiple layers of multiplying and moderating media. These layers, or blankets, include coolant plenums, a beryllium (Be) multiplier layer, a fertile fission blanket and a graphite-pebble reflector. Each layer is separated by perforated oxide dispersion strengthened (ODS) ferritic steel walls. The central fusion chamber is surrounded by an ODS ferritic steel first wall. The first wall is coated with 250-500 {micro}m of tungsten to mitigate x-ray damage. The first wall is cooled by Li{sub 17}Pb{sub 83} eutectic, chosen for its neutron multiplication and good heat transfer properties. The {sub 17}Pb{sub 83} flows in a jacket around the first wall to an extraction plenum. The main coolant injection plenum is immediately behind the Li{sub 17}Pb{sub 83}, separated from the Li{sub 17}Pb{sub 83} by a solid ODS wall. This main system coolant is the molten salt flibe (2LiF-BeF{sub 2}), chosen for beneficial neutronics and heat transfer properties. The use of flibe enables both fusion fuel production (tritium) and neutron moderation and multiplication for the fission blanket. A Be pebble (1 cm diameter) multiplier layer surrounds the coolant injection plenum and the coolant flows radially through perforated walls across the bed. Outside the Be layer, a fission fuel layer comprised of depleted uranium contained in Tristructural-isotropic (TRISO) fuel particles having a packing fraction of 20% in 2 cm diameter fuel pebbles. The fission blanket is cooled by the same radial flibe flow that travels through perforated ODS walls to the reflector blanket. This reflector blanket is 75 cm thick comprised of 2 cm diameter graphite pebbles cooled by flibe. The flibe extraction plenum surrounds the reflector bed. Detailed neutronics designs studies are performed to arrive at the described design. The LFFH engine thermal power is controlled using a technique of adjusting the {sup 6}Li/{sup 7}Li enrichment in the primary and secondary coolants. The enrichment adjusts system thermal power in the design by increasing tritium production while reducing fission. To perform the simulations and design of the LFFH engine, a new software program named LFFH Nuclear Control (LNC) was developed in C++ to extend the functionality of existing neutron transport and depletion software programs. Neutron transport calculations are performed with MCNP5. Depletion calculations are performed using Monteburns 2.0, which utilizes ORIGEN 2.0 and MCNP5 to perform a burnup calculation. LNC supports many design parameters and is capable of performing a full 3D system simulation from initial startup to full burnup. It is able to iteratively search for coolant {sup 6}Li enrichments and resulting material compositions that meet user defined performance criteria. LNC is utilized throughout this study for time dependent simulation of the LFFH engine. Two additional methods were developed to improve the computation efficiency of LNC calculations. These methods, termed adaptive time stepping and adaptive mesh refinement were incorporated into a separate stand alone C++ library name the Adaptive Burnup Library (ABL). The ABL allows for other client codes to call and utilize its functionality. Adaptive time stepping is useful for automatically maximizing the size of the depletion time step while maintaining a desired level of accuracy. Adaptive meshing allows for analysis of fixed fuel configurations that would normally require a computationally burdensome number of depletion zones. Alternatively, Adaptive M

Kramer, K

2010-04-08T23:59:59.000Z

382

Assimilating AMSU-A Radiances in TC Core Area with NOAA Operational HWRF (2011) and a Hybrid Data Assimilation System: Danielle (2010)  

Science Conference Proceedings (OSTI)

A regional hybrid variational-ensemble data assimilation system (HVEDAS), the Maximum Likelihood Ensemble Filter (MLEF), is applied to the 2011 version of the NOAA operational Hurricane Weather Research and Forecasting (HWRF) model to evaluate the ...

Man Zhang; Milija Zupanski; Min-Jeong Kim; John A. Knaff

383

Assimilation of Radar Radial Velocity Data with the WRF Hybrid Ensemble3DVAR System for the Prediction of Hurricane Ike (2008)  

Science Conference Proceedings (OSTI)

An enhanced version of the hybrid ensemblethree-dimensional variational data assimilation (3DVAR) system for the Weather Research and Forecasting Model (WRF) is applied to the assimilation of radial velocity (Vr) data from two coastal Weather ...

Yongzuo Li; Xuguang Wang; Ming Xue

2012-11-01T23:59:59.000Z

384

Retrofitting of Conditioning Systems for Existing Small Commercial Buildings - Analysis and Design of Liquid Desiccant - Vapor Compression Hybrid  

E-Print Network (OSTI)

The combination of several concepts of new energy technologies may make it possible to reduce the energy needs for thermal comfort, especially cooling and dehumidification, in small sized, single-story commercial buildings. The potentials and limitations of retrofit technology for these characteristic structures have been the focus of the experience gained through the design and installation of a system adapted to a building constructed in the early 1960's. The existing split package air conditioning system was combined with a desiccant air-conditioning unit with a waste heat and solar heat reclaim component. While this retrofit system is feasible, a number of questions remain to be considered regarding the design, installation and operation of the total system. This paper focuses on the practical applications of such a hybrid system - both architectural/construction issues and the mechanical components/system considerations.

Arnas, O. A.; McQueen, T. M.

1984-01-01T23:59:59.000Z

385

Desiccant-Based Combined Systems: Integrated Active Desiccant Rooftop Hybrid System Development and Testing Final Report- Phase 4  

SciTech Connect

This report summarizes the results of a research and development (R&D) program to design and optimize an active desiccant-vapor compression hybrid rooftop system. The primary objective was to combine the strengths of both technologies to produce a compact, high-performing, energy-efficient system that could accommodate any percentage of outdoor air and deliver essentially any required combination of temperature and humidity, or sensible heat ratio (SHR). In doing so, such a product would address the significant challenges imposed on the performance capabilities of conventional packaged rooftop equipment by standards 62 and 90.1 of the American Society of Heating, Refrigerating and Air-Conditioning Engineers. The body of work completed as part of this program built upon previous R&D efforts supported by the U.S. Department of Energy and summarized by the Phase 3b report ''Active Desiccant Dehumidification Module Integration with Rooftop Packaged HVAC Units'' (Fischer and Sand 2002), in addition to Fischer, Hallstrom, and Sand 2000; Fischer 2000; and Fischer and Sand 2004. All initial design objectives established for this development program were successfully achieved. The performance flexibility desired was accomplished by a down-sized active desiccant wheel that processes only a portion of the supply airflow, which is pre-conditioned by a novel vapor compression cycle. Variable-speed compressors are used to deliver the capacity control required by a system handling a high percentage of outdoor air. An integrated direct digital control system allows for control capabilities not generally offered by conventional packaged rooftop systems. A 3000-cfm prototype system was constructed and tested in the SEMCO engineering test laboratory in Columbia, MO, and was found to operate in an energy-efficient fashion relative to more conventional systems. Most important, the system offered the capability to independently control the supply air temperature and humidity content to provide individual sensible and latent loads required by an occupied space without over-cooling and reheating air. The product was developed using a housing construction similar to that of a conventional packaged rooftop unit. The resulting integrated active desiccant rooftop (IADR) is similar in size to a currently available conventional rooftop unit sized to provide an equivalent total cooling capacity. Unlike a conventional rooftop unit, the IADR can be operated as a dedicated outdoor air system processing 100% outdoor air, as well as a total conditioning system capable of handling any ratio of return air to outdoor air. As part of this R&D program, a detailed investigation compared the first cost and operating cost of the IADR with costs for a conventional packaged approach for an office building located in Jefferson City, MO. The results of this comparison suggest that the IADR approach, once commercialized, could be cost-competitive with existing technology--exhibiting a one-year to two-year payback period--while simultaneously offering improved humidity control, indoor air quality, and energy efficiency.

Fischer, J

2005-05-06T23:59:59.000Z

386

Towards a hybrid row-column database for a cloud-based medical data management system  

Science Conference Proceedings (OSTI)

Medical data management becomes a real exigency. The emergence of new medical imaging techniques and the necessity to access medical information at any time have led to an inevitable need to find new advanced solutions for managing these critical data. ... Keywords: DICOM, cloud computing, hybrid database, medical imaging

Baraa Mohamad; Laurent d'Orazio; Le Gruenwald

2012-08-01T23:59:59.000Z

387

Charge migration efficiency optimization in hybrid electrical energy storage (HEES) systems  

Science Conference Proceedings (OSTI)

Electrical energy is high-quality form of energy, and thus it is beneficial to store the excessive electric energy in the electrical energy storage (EES) rather than converting into a different type of energy. Like memory devices, no single type of EES ... Keywords: charge management, charge migration, hybrid electrical energy storage

Yanzhi Wang; Younghyun Kim; Qing Xie; Naehyuck Chang; Massoud Pedram

2011-08-01T23:59:59.000Z

388

Study on Hybrid Solar Energy and Ground-Source Heat Pump System  

Science Conference Proceedings (OSTI)

Aim at the weakness of more influenced by the environment etc. factor and the heat flow density lower when the solar energy was make use of heating, so the design method of the hybrid solar energy and ground-source heat pump is proposed, and the operating ... Keywords: solar energy, ground-source, heat pump, coefficient of performance

Liu Yi; Li Bing-xi; Zhou Yi; Fu Zhong-bin; Xu Xin-hai

2009-10-01T23:59:59.000Z

389

A hybrid fuzzy-probabilistic system for risk analysis in petroleum exploration prospects  

Science Conference Proceedings (OSTI)

Petroleum exploration is an economical activity where many billions of dollars are invested every year. Despite these enormous investments, it is still considered a classical example of decision-making under uncertainty. In this paper, a new hybrid fuzzy-probabilistic ... Keywords: Fuzzy logic, Fuzzy modeling, Petroleum exploration, Prospect appraisal, Uncertainty risk analysis

Mauro Roisenberg; Cntia Schoeninger; Reneu Rodrigues da Silva

2009-04-01T23:59:59.000Z

390

Mirror fusion--fission hybrids  

SciTech Connect

The fusion-fission concept and the mirror fusion-fission hybrid program are outlined. Magnetic mirror fusion drivers and blankets for hybrid reactors are discussed. Results of system analyses are presented and a reference design is described.

Lee, J.D.

1978-05-01T23:59:59.000Z

391

Impact of plug-in hybrid electric vehicles on power systems with demand response and wind power.  

Science Conference Proceedings (OSTI)

This paper uses a new unit commitment model which can simulate the interactions among plug-in hybrid electric vehicles (PHEVs), wind power, and demand response (DR). Four PHEV charging scenarios are simulated for the Illinois power system: (1) unconstrained charging, (2) 3-hour delayed constrained charging, (3) smart charging, and (4) smart charging with DR. The PHEV charging is assumed to be optimally controlled by the system operator in the latter two scenarios, along with load shifting and shaving enabled by DR programs. The simulation results show that optimally dispatching the PHEV charging load can significantly reduce the total operating cost of the system. With DR programs in place, the operating cost can be further reduced.

Wang, J.; Liu, C.; Ton, D.; Zhou, Y.; Kim, J.; Vyas, A. (Decision and Information Sciences); ( ES); (ED); (Kyungwon Univ.)

2011-07-01T23:59:59.000Z

392

Amp-hour counting charge control for photovoltaic hybrid power systems  

SciTech Connect

An amp-hour counting battery charge control algorithm has been defined and tested using the Digital Solar Technologies MPR-9400 microprocessor based photovoltaic hybrid charge controller. This work included extensive laboratory and field testing of the charge algorithm on vented lead-antimony and valve regulated lead-acid batteries. The test results have shown that with proper setup amp-hour counting charge control is more effective than conventional voltage regulated sub-array shedding in returning the lead-acid battery to a high state of charge.

Hund, T.D. [Sandia National Labs., Albuquerque, NM (United States); Thompson, B. [Biri Systems, Ithaca, NY (United States)

1997-10-01T23:59:59.000Z

393

A Multi-Level Grid Interactive Bi-directional AC/DC-DC/AC Converter and a Hybrid Battery/Ultra-capacitor Energy Storage System with Integrated Magnetics for Plug-in Hybrid Electric Vehicles  

DOE Green Energy (OSTI)

This study presents a bi-directional multi-level power electronic interface for the grid interactions of plug-in hybrid electric vehicles (PHEVs) as well as a novel bi-directional power electronic converter for the combined operation of battery/ultracapacitor hybrid energy storage systems (ESS). The grid interface converter enables beneficial vehicle-to-grid (V2G) interactions in a high power quality and grid friendly manner; i.e, the grid interface converter ensures that all power delivered to/from grid has unity power factor and almost zero current harmonics. The power electronic converter that provides the combined operation of battery/ultra-capacitor system reduces the size and cost of the conventional ESS hybridization topologies while reducing the stress on the battery, prolonging the battery lifetime, and increasing the overall vehicle performance and efficiency. The combination of hybrid ESS is provided through an integrated magnetic structure that reduces the size and cost of the inductors of the ESS converters. Simulation and experimental results are included as prove of the concept presenting the different operation modes of the proposed converters.

Onar, Omer C [ORNL

2011-01-01T23:59:59.000Z

394

Evaluation of the 2008 Lexus LS 600H Hybrid Synergy Drive System  

Science Conference Proceedings (OSTI)

Subsystems of the 2008 Lexus 600h hybrid electric vehicle (HEV) were studied and tested as part of an intensive benchmarking effort carried out to produce detailed information concerning the current state of nondomestic alternative vehicle technologies. Feedback provided by benchmarking efforts is particularly useful to partners of the Vehicle Technologies collaborative research program as it is essential in establishing reasonable yet challenging programmatic goals which facilitate development of competitive technologies. The competitive nature set forth by the Vehicle Technologies program not only promotes energy independence and economic stability, it also advocates the advancement of alternative vehicle technologies in an overall global perspective. These technologies greatly facilitate the potential to reduce dependency on depleting natural resources and mitigate harmful impacts of transportation upon the environment.

Burress, T.A.; Coomer, C.L.; Campbell, S.L.; Wereszczak, A.A.; Cunningham, J.P.; Marlino, L.D.; Seiber, L.E.; Lin, H.T.

2009-01-15T23:59:59.000Z

395

Statistical model checking for safety critical hybrid systems: an empirical evaluation  

Science Conference Proceedings (OSTI)

As more computing systems are utilized in various areas of our society, the reliability of computing systems becomes a significant issue. However, as the complexity of computing systems increases, conventional verification and validation techniques such ...

Youngjoo Kim, Moonzoo Kim, Tai-Hyo Kim

2012-11-01T23:59:59.000Z

396

A New Paradigm for Optimizing Hybrid Simulations of Rare Event Modeling for Complex Systems  

E-Print Network (OSTI)

-scale complex systems. Most complex systems such as our cities, national air space, nuclear power plants complex systems such as our cities, national air space, nuclear power plants, theme parks and global

Cook, Jeanine

397

Analysis of a hybrid UFAD and radiant hydronic slab HVAC system  

E-Print Network (OSTI)

Air- Conditioning Engineers HVAC & R Research, vol. 50, Sep.andradianthydronicslabHVACsystem. Paul RAFTERY a,* ,of a novel integrated HVAC system. This system combines an

Raftery, Paul; Lee, Kwang Ho; Webster, Thomas; Bauman, Fred

2011-01-01T23:59:59.000Z

398

A Vehicle Systems Approach to Evaluate Plug-in Hybrid Battery Cold Start, Life and Cost Issues  

E-Print Network (OSTI)

The batteries used in plug-in hybrid electric vehicles (PHEVs) need to overcome significant technical challenges in order for PHEVs to become economically viable and have a large market penetration. The internship at Argonne National Laboratory (ANL) involved two experiments which looked at a vehicle systems approach to analyze two such technical challenges: Battery life and low battery power at cold (-7 ?C) temperature. The first experiment, concerning battery life and its impact on gasoline savings due to a PHEV, evaluates different vehicle control strategies over a pre-defined vehicle drive cycle, in order to identify the control strategy which yields the maximum dollar savings (operating cost) over the life of the vehicle, when compared to a charge sustaining hybrid. Battery life degradation over the life of the vehicle, and fuel economy savings on every trip (daily) are taken into account when calculating the net present value of the gasoline dollars saved. The second experiment evaluates the impact of different vehicle control strategies in heating up the PHEV battery (due to internal ohmic losses) for cold ambient conditions. The impact of low battery power (available to the vehicle powertrain) due to low battery and ambient temperatures has been well documented in literature. The trade-off between the benefits of heating up the battery versus heating up the internal combustion engine are evaluated, using different control strategies, and the control strategy, which provided optimum temperature rise of each component, is identified.

Shidore, Neeraj Shripad

2012-05-01T23:59:59.000Z

399

Field Test and Performance Verification: Integrated Active Desiccant Rooftop Hybrid System Installed in a School - Final Report: Phase 4A  

SciTech Connect

This report summarizes the results of a field verification pilot site investigation that involved the installation of a hybrid integrated active desiccant/vapor-compression rooftop heating, ventilation, and air-conditioning (HVAC) unit at an elementary school in the Atlanta Georgia area. For years, the school had experienced serious humidity and indoor air quality (IAQ) problems that had resulted in occupant complaints and microbial (mold) remediation. The outdoor air louvers of the original HVAC units had been closed in an attempt to improve humidity control within the space. The existing vapor compression variable air volume system was replaced by the integrated active desiccant rooftop (IADR) system that was described in detail in an Oak Ridge National Laboratory (ORNL) report published in 2004 (Fischer and Sand 2004). The IADR system and all space conditions have been monitored remotely for more than a year. The hybrid system was able to maintain both the space temperature and humidity as desired while delivering the outdoor air ventilation rate required by American Society of Heating, Refrigerating and Air-Conditioning Engineers Standard 62. The performance level of the IADR unit and the overall system energy efficiency was measured and found to be very high. A comprehensive IAQ investigation was completed by the Georgia Tech Research Institute before and after the system retrofit. Before-and-after data resulting from this investigation confirmed a significant improvement in IAQ, humidity control, and occupant comfort. These observations were reported by building occupants and are echoed in a letter to ORNL from the school district energy manager. The IADR system was easily retrofitted in place of the original rooftop system using a custom curb adapter. All work was completed in-house by the school's maintenance staff over one weekend. A subsequent cost analysis completed for the school district by the design engineer of record concluded that the IADR system being investigated was actually less expensive to install than other less-efficient options, most of which were unable to deliver the required ventilation while maintaining the desired space humidity levels.

Fischer, J

2005-12-21T23:59:59.000Z

400

Solar thermal electric hybridization issues  

DOE Green Energy (OSTI)

Solar thermal electric systems have an advantage over many other renewable energy technologies because the former use heat as an intermediate energy carrier. This is an advantage as it allows for a relatively simple method of hybridization by using heat from fossil-fuel. Hybridization of solar thermal electric systems is a topic that has recently generated significant interest and controversy and has led to many diverse opinions. This paper discusses many of the issues associated with hybridization of solar thermal electric systems such as what role hybridization should play; how it should be implemented; what are the efficiency, environmental, and cost implications; what solar fraction is appropriate; how hybrid systems compete with solar-only systems; and how hybridization can impact commercialization efforts for solar thermal electric systems.

Williams, T A; Bohn, M S; Price, H W

1994-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

U.S. Hybrid and Lithium Technology Corporation GAIA Battery: Initial System Characterization for the Plug-In Hybrid Electric Vehicle Yard Tractor  

Science Conference Proceedings (OSTI)

Diesel-powered tractors, called yard tractors, are used to shuttle cargo trailers from point to point within the confines of a port facility, terminal, or yard. A plug-in hybrid electric vehicle (PHEV) yard tractor design was proposed as a way to reduce operation emissions and diesel fuel use. The Electric Power Research Institute (EPRI) has designed and constructed a first-of-a-kind PHEV yard tractor. Southern California Edison's (SCE's) Electric Vehicle Technical Center performed PHEV yard tractor bat...

2012-03-01T23:59:59.000Z

402

A New Hybrid Agent-Based Modeling & Simulation Decision Support System for Breast Cancer Data Analysis " presented at the ICICT  

E-Print Network (OSTI)

AbstractIn this paper, we present a novel technique of building hybrid decision support systems which integrates traditional decision support systems with agent based models for use in breast cancer analysis for better prediction and recommendation. Our system is based on using queries from data (converted to a standardized electronic template) to provide for simulation variables in an agent-based model. The goal is to develop an ICT tool to assist non-specialist biologist researcher users in performing analysis of large amounts of data by applying simple simulation techniques. To demonstrate the effectiveness of this novel decision support system, an extensive breast cancer data collection exercise was carried out with the support of Hospitals in a previously unexplored region. The collected data was subsequently integrated in an electronic medical record filing system for patients. We also demonstrate the application of agent based modeling and simulation techniques for building simulation models of tumor growth and treatment. Our proposed decision support system also provides a comprehensive query tool which facilitates the use of retrieved data in statistical tools 2 for subsequent interpretation and analysis. A I.

Amnah Siddiqa; Muaz Niazi; Farah Mustafa; Habib Bokhari; Amir Hussain; Noreen Akram; Shabnum Shaheen; Fouzia Ahmed; Sarah Iqbal

2009-01-01T23:59:59.000Z

403

A CLASSIFICATION SCHEME FOR THE COMMON PASSIVE AND HYBRID HEATING AND COOLING SYSTEMS  

E-Print Network (OSTI)

EXAMPLES OF PASSIVE SOLAR HEATING SYSTEMS {CONVECTIVE SPACEbeen supported by the Solar Heating and Cooling Research andinteraction. Passive solar heating systems use elements of

Holtz, Michael J.

2011-01-01T23:59:59.000Z

404

STATEMENT OF CONSIDERATIONS REQUEST BY HYBRID POWER GENERATION...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a turbogenerator. The proposed hybrid system is based on planar SOFC and...

405

Hybrid automobile  

SciTech Connect

The invention discloses a parallel hybrid drive system for self propelled vehicles including a direct current motor-generator having a drive shaft in common with an internal combustion engine leading to a variable speed transmission and a final drive train. The motor-generator has a no-load speed, established by a separate field exciter, below which it drives the shaft as a motor and above which it is driven by the shaft as a generator. Storage batteries are operatively connected to the motor-generator to supply power to it below the no-load speed. The internal combustion engine operates over a small RPM range around its most efficient speed at a power level established by a fixed throttle setting. The transmission is operatively connected to an accelerator and direction selector switch to vary the speed and direction of the vehicle.

Lynch, T.E.; Eastman, D.P.; Price, R.P.

1979-08-28T23:59:59.000Z

406

Battery testing at Argonne National Laboratory. Electric and hybrid propulsion systems, No. 1  

SciTech Connect

Advanced battery technology evaluations are performed under simulated electric-vehicle operating conditions at the Analysis & Diagnostic Laboratory (ADL) of Argonne National Laboratory. The ADL results provide insight into those factors that limit battery performance and life. The ADL facilities include a test laboratory to conduct battery experimental evaluations under simulated application conditions and a post-test analysis laboratory to determine, in a protected atmosphere if needed, component compositional changes and failure mechanisms. This paper summarizes the performance characterizations and life evaluations conducted during FY 1992 on both single cells and multi-cell modules that encompass six battery technologies [Na/S, Li/FeS, Ni/Metal-Hydride, Ni/Zn, Ni/Cd, Ni/Fe]. These evaluations were performed for the Department of Energy, Office of Transportation Technologies, Electric and Hybrid Propulsion Division, and the Electric Power Research Institute. The ADL provides a common basis for battery performance characterization and lie evaluations with unbiased application of tests and analyses. The results help identify the most promising R&D approaches for overcoming battery limitations, and provide battery users, developers, and program managers with a measure of the progress being made in battery R&D programs, a comparison of battery technologies, and basic data for modeling.

DeLuca, W.H.; Gillie, K.R.; Kulaga, J.E.; Smaga, J.A.; Tummillo, A.F.; Webster, C.E.

1992-12-31T23:59:59.000Z

407

Novel Hybrid Monte Carlo/Deterministic Technique for Shutdown Dose Rate Analyses of Fusion Energy Systems  

SciTech Connect

The rigorous 2-step (R2S) method uses three-dimensional Monte Carlo transport simulations to calculate the shutdown dose rate (SDDR) in fusion reactors. Accurate full-scale R2S calculations are impractical in fusion reactors because they require calculating space- and energy-dependent neutron fluxes everywhere inside the reactor. The use of global Monte Carlo variance reduction techniques was suggested for accelerating the neutron transport calculation of the R2S method. The prohibitive computational costs of these approaches, which increase with the problem size and amount of shielding materials, inhibit their use in the accurate full-scale neutronics analyses of fusion reactors. This paper describes a novel hybrid Monte Carlo/deterministic technique that uses the Consistent Adjoint Driven Importance Sampling (CADIS) methodology but focuses on multi-step shielding calculations. The Multi-Step CADIS (MS-CADIS) method speeds up the Monte Carlo neutron calculation of the R2S method using an importance function that represents the importance of the neutrons to the final SDDR. Using a simplified example, preliminarily results showed that the use of MS-CADIS enhanced the efficiency of the neutron Monte Carlo simulation of an SDDR calculation by a factor of 550 compared to standard global variance reduction techniques, and that the increase over analog Monte Carlo is higher than 10,000.

Ibrahim, Ahmad M [ORNL; Peplow, Douglas E. [ORNL; Peterson, Joshua L [ORNL; Grove, Robert E [ORNL

2013-01-01T23:59:59.000Z

408

Improving Posterior Based Confidence Measures in Hybrid HMM/ANN Speech Recognition Systems  

E-Print Network (OSTI)

. In this paper, building upon previous work by others [7], we define and investigate a set of confidence measures based on hybrid Hidden Markov Model/Artificial Neural Network (HMM/ANN) acoustic models. All these measures are using the neural network to estimate the local phone posterior probabilities, which are then combined and normalized in different ways. Experimental results will indeed show that the use of an appropriate duration normalization is very important to obtain good estimates of the phone and word confidences. The different measures are evaluated at the phone and word levels on both an isolated word task (PHONEBOOK) and a continuous speech recognition task (BREF). It will be shown that one of those confidence measures is well suited for utterance verification, and that (as one could expect) confidence measures at the word level perform better than those at the phone level. Finally, using the resulting approach on PHONEBOOK to rescore the N-best list is shown to yield a...

Martigny Valais Suisse; Giulia Bernardis; Herve Bourlard

1998-01-01T23:59:59.000Z

409

Storage device sizing for a hybrid railway traction system by means of bicausal bond graphs  

E-Print Network (OSTI)

(a supercapacitor) included in this system is then discussed. Keywords: bond graph, bicausality In the paper, the example of a supercapacitor process consists of choosing the system structure dimensioning

Paris-Sud XI, Université de

410

Performance and Economics of a Wind-Diesel Hybrid Energy System: Naval Air Landing Field, San Clemente Island, California  

DOE Green Energy (OSTI)

This report provides an overview of the wind resource, economics and operation of the recently installed wind turbines in conjunction with diesel power for the Naval Air Landing Field (NALF), San Clemente Island (SCI), California Project. The primary goal of the SCI wind power system is to operate with the existing diesel power plant and provide equivalent or better power quality and system reliability than the existing diesel system. The wind system is also intended to reduce, as far as possible, the use of diesel fuel and the inherent generation of nitrogen-oxide emissions and other pollutants. The first two NM 225/30 225kW wind turbines were installed and started shake-down operations on February 5, 1998. This report describes the initial operational data gathered from February 1998 through January 1999, as well as the SCI wind resource and initial cost of energy provided by the wind turbines on SCI. In support of this objective, several years of data on the wind resources of San Clemente Island were collected and compared to historical data. The wind resource data were used as input to economic and feasibility studies for a wind-diesel hybrid installation for SCI.

McKenna, E. (National Renewable Energy Laboratory); Olsen, T. (Timothy Olsen Consulting)

1999-07-06T23:59:59.000Z

411

A Comparison of Two Solar-Powered LED Street and Area Lighting Systems: Demonstration Results from Melton Hill Dam and Habitat for Humanity of Greater Chattanooga, Tennessee  

Science Conference Proceedings (OSTI)

Solar-powered lighting systems have developed to the point that they can now be considered as a viable option in replacing traditional grid-connected lighting in many areas. Two sites, Melton Hill dam near Lenoir City, Tennessee, and Habitat for Humanity in Chattanooga served as a unique testing opportunity to investigate the feasibility of LED solar-powered lighting as a replacement for traditional lighting technologies in off-grid applications. In this case study, each site is analyzed individually, but .

2013-09-30T23:59:59.000Z

412

Solar Central Receiver Hybrid Power Systems sodium-cooled receiver concept. Final report. Volume II, Book 2. Conceptual design, Sections 5 and 6  

DOE Green Energy (OSTI)

The overall, long-term objective of the Solar Central Receiver Hybrid Power System program is to identify, characterize, and ultimately demonstrate the viability and cost effectiveness of solar/fossil, steam Rankine cycle, hybrid power systems that: (1) consist of a combined solar central receiver energy source and a nonsolar energy source at a single, common site, (2) may operate in the base, intermediate, and peaking capacity modes, (3) produce the rated output independent of variations in solar insolation, (4) provide a significant savings (50% or more) in fuel consumption, and (5) produce power at the minimum possible cost in mills/kWh. It is essential that these hybrid concepts be technically feasible and economically competitive with other systems in the near to mid-term time period (1985-1990) on a commercial scale. The program objective for Phase I is to identify and conceptually characterize solar/fossil steam Rankine cycle, commercial-scale, power plant systems that are economically viable and technically feasible. This volume contains the detailed conceptual design and cost/performance estimates and an assessment of the commercial scale solar central receiver hybrid power system. (WHK)

None

1980-01-01T23:59:59.000Z

413

Hybrid solar-fossil fuel power generation  

E-Print Network (OSTI)

In this thesis, a literature review of hybrid solar-fossil fuel power generation is first given with an emphasis on system integration and evaluation. Hybrid systems are defined as those which use solar energy and fuel ...

Sheu, Elysia J. (Elysia Ja-Zeng)

2012-01-01T23:59:59.000Z

414

Hybrid Vehicle Links  

NLE Websites -- All DOE Office Websites (Extended Search)

Hybrid Links Hybrid Links Exit Fueleconomy.gov The links below are to pages that are not part of the fueleconomy.gov Web site. We offer these external links for your convenience in accessing additional information that may be useful or interesting to you. Hybrid Vehicles and Manufacturers Acura ILX Hybrid Audi Q5 Hybrid BMW ActiveHybrid 3 ActiveHybrid 5 ActiveHybrid 7 Buick LaCrosse eAssist* Regal eAssist* Chevrolet Malibu Eco* Impala eAssist* Ford Fusion Hybrid Honda Accord Hybrid Civic Hybrid Honda CR-Z Honda Insight Hyundai Sonata Hybrid Infiniti M Hybrid Q50 Hybrid Q50 S Hybrid QX60 Hybrid Kia Optima Hybrid Lexus CT 200h Lexus ES 300h GS 450h LS 600h L RX 450h Lincoln MKZ Hybrid Mercedes-Benz Mercedes E400 Hybrid Nissan Pathfinder Hybrid Porsche Cayenne S Hybrid Subaru XV Crosstrek Hybrid Toyota Avalon Hybrid

415

Worldwide wind/diesel hybrid power system study: Potential applications and technical issues  

DOE Green Energy (OSTI)

The world market potential for wind/diesel hybrid technology is a function of the need for electric power, the availability of sufficient wind resource to support wind/diesel power, and the existence of buyers with the financial means to invest in the technology. This study includes data related to each of these three factors. This study does not address market penetration, which would require analysis of application specific wind/diesel economics. Buyer purchase criteria, which are vital to assessing market penetration, are discussed only generally. Countries were screened for a country-specific market analysis based on indicators of need and wind resource. Both developed countries and less developed countries'' (LDCs) were screened for wind/diesel market potential. Based on the results of the screening, ten countries showing high market potential were selected for more extensive market analyses. These analyses provide country-specific market data to guide wind/diesel technology developers in making design decisions that will lead to a competitive product. Section 4 presents the country-specific data developed for these analyses, including more extensive wind resource characterization, application-specific market opportunities, business conditions, and energy market characterizations. An attempt was made to identify the potential buyers with ability to pay for wind/diesel technology required to meet the application-specific market opportunities identified for each country. Additionally, the country-specific data are extended to corollary opportunities in countries not covered by the study. Section 2 gives recommendations for wind/diesel research based on the findings of the study. 86 refs.

King, W.R.; Johnson, B.L. III (Science Applications International Corp., McLean, VA (USA))

1991-04-01T23:59:59.000Z

416

Electrochemical Capacitors as Energy Storage in Hybrid-Electric Vehicles: Present Status and Future Prospects  

E-Print Network (OSTI)

ultracapacitors, fuel cells and hybrid vehicle design. Dr.on electric and hybrid vehicle technology and applicationssupervises testing in the Hybrid Vehicle Propulsion Systems

Burke, Andy; Miller, Marshall

2009-01-01T23:59:59.000Z

417

Performance Characteristics of Lithium-ion Batteries of Various Chemistries for Plug-in Hybrid Vehicles  

E-Print Network (OSTI)

supervises testing in the Hybrid Vehicle Propulsion SystemsChemistries for Plug-in Hybrid Vehicles Andrew Burke,batteries, plug-in hybrid vehicles, energy density, pulse

Burke, Andrew; Miller, Marshall

2009-01-01T23:59:59.000Z

418

A new hybrid computational intelligence algorithm for optimized vehicle routing applications in geographic information systems.  

E-Print Network (OSTI)

??This project explores the application of two developing algorithmic paradigms from the field of computational intelligence towards optimized vehicle routing applications within geographic information systems (more)

Rice, Michael Norris

2005-01-01T23:59:59.000Z

419

Dynamic modeling and control of hybrid ground source heat pump systems.  

E-Print Network (OSTI)

??Ground source heat pump (GSHP) systems are one of the fastest growing applications of renewable energy in the world with annual increases of 10% over (more)

Chen, Chang

2008-01-01T23:59:59.000Z

420

Hybrid Two-Dimensional Electronic Systems and Other Applications of sp-2 Bonded Light Elements  

E-Print Network (OSTI)

the storage of energy using technologies such as hydrogen,Energy Applications of sp-2 Bonded Materials 5 Hydrogen Storagea hydrogen storage systems total gravimetric energy density

Kessler, Brian Maxwell

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Modular simulation of a hybrid power system with diesel and wind turbine generation  

Science Conference Proceedings (OSTI)

In this paper, the authors present the modular simulation tool they developed to help study the system dynamics for wind-diesel power systems. The principal modules of the simulator, which include a diesel generator, a wind turbine generator, a rotary converter with a battery, a village load and a dump load, are described. With a case study, the authors demonstrate how the designer benefits from easily understanding the effects of system modifications. Using this tool, a designer can easily develop control strategies to balance the system power flows under different generation/load conditions.

Bialasiewicz, J.T.; Mulijadi, E.; Drouilhet, S.; Nix, G.

1998-06-01T23:59:59.000Z

422

Laser Inertial Fusion-based Energy: Neutronic Design Aspects of a Hybrid Fusion-Fission Nuclear Energy System  

E-Print Network (OSTI)

1.1.3.1 Fission Energy . . . . . . . . . 1.1.3.21.1.3.3 Fission-Fusion Hybrids . . . . 1.2 Scope and Purposei CONTENTS Fission Blanket . . . . . . . . . . . . . . . . .

Kramer, Kevin James

2010-01-01T23:59:59.000Z

423

Laser Inertial Fusion-based Energy: Neutronic Design Aspects of a Hybrid Fusion-Fission Nuclear Energy System  

E-Print Network (OSTI)

for magnetic fusion reactors and IFMIF. Journal of NuclearFusion reactors blanket nucleonics. In Progress in NuclearFusion-Fission hybrid reactors. In Advances in Nuclear

Kramer, Kevin James

2010-01-01T23:59:59.000Z

424

Axisymmetric Magnetic Mirror Fusion-Fission Hybrid  

Science Conference Proceedings (OSTI)

Fusion-Fission Hybrids and Transmutation / Proceedings of the Fifteenth International Conference on Emerging Nuclear Energy Systems

R. W. Moir; N. N. Martovetsky; A. W. Molvik; D. D. Ryutov; T. C. Simonen

425

Designing a Residential Hybrid Electrical Energy Storage System Based on the Energy Buffering Strategy  

E-Print Network (OSTI)

the electricity price is low and supply energy for usage when the electricity price is high [6], and thereby energy buffering. Figure 3 shows the structure of a typical grid-connected HEES system. Without loss the proposed energy management system is targeting residential usage, we must limit its overall form factor

Pedram, Massoud

426

LQ Optimal Control of Wind Turbines in Hybrid Power Systems N.A. Cutululis1  

E-Print Network (OSTI)

Systems, Faculty of Electrical Engineering, "Dunrea de Jos" University of Galati, Abstract: Wind ­ diesel taken into account for the design of a wind ­ diesel power system is the wind power penetration, which electrical load. However, the penetration of wind power into small diesel-based grids is limited because

427

Hybrid power management in real time embedded systems: an interplay of DVFS and DPM techniques  

Science Conference Proceedings (OSTI)

Energy-aware scheduling of real time applications over multiprocessor systems is considered in this paper. Early research reports that while various energy-saving policies, for instance Dynamic Power Management (DPM) and Dynamic Voltage & Frequency ... Keywords: Dynamic power management, Dynamic voltage & frequency scaling, Energy, Machine learning, Multiprocessor scheduling, Power, Real time systems

Muhammad Khurram Bhatti; Ccile Belleudy; Michel Auguin

2011-03-01T23:59:59.000Z

428

An Enhanced Semantic Layer for Hybrid Recommender Systems: Application to News Recommendation  

Science Conference Proceedings (OSTI)

Recommender systems have achieved success in a variety of domains, as a means to help users in information overload scenarios by proactively finding items or services on their behalf, taking into account or predicting their tastes, priorities, or goals. ... Keywords: Collaborative Filtering, Context Modelling, Domain Knowledge, Ontologies, Recommender Systems, Semantics

Ivn Cantador; Pablo Castells; Alejandro Bellogn

2011-01-01T23:59:59.000Z

429

Monitored Performance Data from a Hybrid RAPS System and the Determination of Control Set Points for Simulation Studies Patel ISES 2001 Solar World Congress 1  

E-Print Network (OSTI)

located in the north-west region of Western Australia. The system under study comprises PV array, a diesel, diesel generator, and inverter models of the RAPSIM simulation package are derived. Two separate sets the simulation program are shown. 1. INTRODUCTION Reliable long-term monitored performance data for a hybrid

430

HYBRID GROUND SOURCE HEAT PUMP SYSTEM SIMULATION USING VISUAL MODELING TOOL FOR HVACSIM+  

E-Print Network (OSTI)

incorporate both ground loop heat exchangers and supplemental heat rejecters, such as cooling towers, cooling-to-air heat pump (Yavuzturk 2000), heated pavement systems (Chiasson, et al. 2000a), shallow cooling ponds

431

Flexible hybrid membrane treatment systems for tailored nutrient management: A new paradigm in urban wastewater treatment  

E-Print Network (OSTI)

the clay and glaze waste that previously was washed down the drain, reclaiming 15 gallons of glaze and 300 with a student team. Over 90% of irrigation systems are automated and connected to a weather station

432

Dual-temperature Kalina cycle for geothermal-solar hybrid power systems  

E-Print Network (OSTI)

This thesis analyzes the thermodynamics of a power system coupling two renewable heat sources: low-temperature geothermal and a high-temperature solar. The process, referred to as a dual-temperature geothermal-solar Kalina ...

Boghossian, John G

2011-01-01T23:59:59.000Z

433

MW-class hybrid power system based on planar solid oxide stack...  

NLE Websites -- All DOE Office Websites (Extended Search)

148 BOP Total 900,830 290 155,220 Power conditioning 50 Recuperators 99,314 32 Instrumentation and controls 93,130 30 Piping and valves 93,130 30 System Factory Cost...

434

A hybrid data structure for dense keys in in-memory database systems  

E-Print Network (OSTI)

This thesis presents a data structure which performs well for in-memory indexing of keys that are unevenly distributed into clusters with a high density of keys. This pattern is prevalent, for example, in systems that use ...

Muiz Navarro, Jos Alberto

2010-01-01T23:59:59.000Z

435

Study of the validity of a combined potential model using the hybrid reverse Monte Carlo method in fluoride glass system  

E-Print Network (OSTI)

The choice of appropriate interaction models is among the major disadvantages of conventional methods such as molecular dynamics and Monte Carlo simulations. On the other hand, the so-called reverse Monte Carlo (RMC) method, based on experimental data, can be applied without any interatomic and/or intermolecular interactions. The RMC results are accompanied by artificial satellite peaks. To remedy this problem, we use an extension of the RMC algorithm, which introduces an energy penalty term into the acceptance criteria. This method is referred to as the hybrid reverse Monte Carlo (HRMC) method. The idea of this paper is to test the validity of a combined potential model of coulomb and Lennard-Jones in a fluoride glass system BaMnMF_{7} (M=Fe,V) using HRMC method. The results show a good agreement between experimental and calculated characteristics, as well as a meaningful improvement in partial pair distribution functions. We suggest that this model should be used in calculating the structural properties and in describing the average correlations between components of fluoride glass or a similar system. We also suggest that HRMC could be useful as a tool for testing the interaction potential models, as well as for conventional applications.

S. M. Mesli; M. Habchi; M. Kotbi; H. Xu

2013-03-25T23:59:59.000Z

436

Investigation of Synergy Between Electrochemical Capacitors, Flywheels, and Batteries in Hybrid Energy Storage for PV Systems  

DOE Green Energy (OSTI)

This report describes the results of a study that investigated the synergy between electrochemical capacitors (ECs) and flywheels, in combination with each other and with batteries, as energy storage subsystems in photovoltaic (PV) systems. EC and flywheel technologies are described and the potential advantages and disadvantages of each in PV energy storage subsystems are discussed. Seven applications for PV energy storage subsystems are described along with the potential market for each of these applications. A spreadsheet model, which used the net present value method, was used to analyze and compare the costs over time of various system configurations based on flywheel models. It appears that a synergistic relationship exists between ECS and flywheels. Further investigation is recommended to quantify the performance and economic tradeoffs of this synergy and its effect on overall system costs.

Miller, John; Sibley, Lewis, B.; Wohlgemuth, John

1999-06-01T23:59:59.000Z

437

Diesel hybridization and emissions.  

DOE Green Energy (OSTI)

The CTR Vehicle Systems and Fuels team a diesel hybrid powertrain. The goal of this experiment was to investigate and demonstrate the potential of diesel engines for hybrid electric vehicles (HEVs) in a fuel economy and emissions. The test set-up consisted of a diesel engine coupled to an electric motor driving a Continuously Variable Transmission (CVT). This hybrid drive is connected to a dynamometer and a DC electrical power source creating a vehicle context by combining advanced computer models and emulation techniques. The experiment focuses on the impact of the hybrid control strategy on fuel economy and emissions-in particular, nitrogen oxides (NO{sub x}) and particulate matter (PM). The same hardware and test procedure were used throughout the entire experiment to assess the impact of different control approaches.

Pasquier, M.; Monnet, G.

2004-04-21T23:59:59.000Z

438

Radio frequency plasma heating in large tokamak systems near the lower hybrid resonance  

SciTech Connect

The frequency range, power, efficiency, and pulse length of a high power rf system are discussed as they might be applied to the TFTR Tokamak facility as well as on a full scale reactor. Comparisons are made of the size, power output, and costs to obtain microwave power sufficient to satisfy the physics requirements. A new microwave feed concept is discussed which will improve the coupling of the microwave energy into the plasma. The unique advantages of waveguide feed systems is apparent when one considers the practical problems associated with coupling supplementary heating energy into a reactor. (auth)

Deitz, A.; Hooke, W.M.

1975-01-01T23:59:59.000Z

439

Analysis of software-intensive system acquisition using hybrid software process simulation  

Science Conference Proceedings (OSTI)

Many sources have reported that the technical and managerial maturity of the acquirer is the essential key to success of Software-Intensive System Acquisition (SISA) and recommended to adopt the best practices. However, DoD is inactive to implement the ...

KeungSik Choi; Doo-Hwan Bae

2006-05-01T23:59:59.000Z

440

A forecasting solution to the oil spill problem based on a hybrid intelligent system  

Science Conference Proceedings (OSTI)

Oil spills represent one of the most destructive environmental disasters. Predicting the possibility of finding oil slicks in a certain area after an oil spill can be critical in reducing environmental risks. The system presented here uses the Case-Based ... Keywords: Case-Based Reasoning, Ensembles, Fusion algorithms, Oil spill, Radial Basis Function, Self organizing memory

Bruno Baruque; Emilio Corchado; Aitor Mata; Juan M. Corchado

2010-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

A CLASSIFICATION SCHEME FOR THE COMMON PASSIVE AND HYBRID HEATING AND COOLING SYSTEMS  

E-Print Network (OSTI)

detailed discussion of sun angles see "The Solar Resource:Passive Solar Conference. NORTH SUM ER SUN ANGLES ON SOUTH-SOLAR COOLING SYSTEMS STORAGE ROOF ISOLATED STORAGE ROOF {NIGHT.SKY RADIATION) {NJGHTSKY RADIATION) {REQUIRES MOVING INSULATION) SUN

Holtz, Michael J.

2011-01-01T23:59:59.000Z

442

Hybrid Radiator-Cooling System (ANL-IN-11-096)  

fully-loaded truck climbing up Baker Grade on the hottest summer day. The coolant system, including radiator, is sized to remove 100% of the required heat from the engine at the design condition without boiling the coolant, which results in a large ...

443

Charge Migration Efficiency Optimization in Hybrid Electrical Energy Storage (HEES) Systems  

E-Print Network (OSTI)

. Experimental results for an HEES system comprising of banks of batteries and supercapacitors demonstrate a migration efficiency improvement up to 51.3%, for su- percapacitor to battery and supercapacitor to supercapacitor charge migration. 1. INTRODUCTION Electrical energy usage changes over time due to the types

Pedram, Massoud

444

Adaptive Model Predictive Control of the Hybrid Dynamics of a Fuel Cell System.  

E-Print Network (OSTI)

of conclusions. II. DESCRIPTION OF FUEL CELLS A fuel cell (FC) is a device that generates electricity from of Systems and Automatic of the University of Seville, generates electricity from the chemical reaction hydrogen and oxygen. This is achieved by converting chemical energy of the fuel directly into electricity

Paris-Sud XI, Université de

445

Technology Optimization Process for Heavy Hybrid Electric Vehicle Systems Using Computational Models  

DOE Green Energy (OSTI)

We have developed a computer-based technology optimization process to define vehicle systems that meet specified goals and constraints using a minimum amount of resources. In this paper, we describe the technology optimization process, with a focus on technical target setting, and illustrate its use with a simple example.

OKeefe, M.; Walkowicz, K.; Hendricks, T.

2005-01-01T23:59:59.000Z

446

Assessment of Advanced Air Purification Technologies: Filtration and Hybrid Systems for Residential and Commercial Applications  

Science Conference Proceedings (OSTI)

Indoor air contaminants, such as microorganisms, allergens, environmental tobacco smoke, and volatile organic compounds, can cause health- and productivity-related problems for the occupants of the indoor space. Children, elderly adults, and people with deficient immune systems are especially likely to be affected by contaminated air. There are three primary measures to control indoor air contamination. The first is to eliminate the contaminant source. The second is to control ventilation within the spac...

2003-01-20T23:59:59.000Z

447

EVALUATION OF FLAT-PLATE PHOTOVOLTAIC THERMAL HYBRID SYSTEMS FOR SOLAR ENERGY UTILIZATION.  

DOE Green Energy (OSTI)

The technical and economic attractiveness of combined photovoltaic/thermal (PV/T) solar energy collectors was evaluated. The study was limited to flat-plate collectors since concentrating photovoltaic collectors require active cooling and thus are inherently PV/T collectors, the only decision being whether to use the thermal energy or to dump it. it was also specified at the outset that reduction in required roof area was not to be used as an argument for combining the collection of thermal and electrical energy into one module. Three tests of economic viability were identified, all of which PV/T must pass if it is to be considered a promising alternative: PV/T must prove to be competitive with photovoltaic-only, thermal-only, and side-by-side photovoltaic-plus-thermal collectors and systems. These three tests were applied to systems using low-temperature (unglazed) collectors and to systems using medium-temperature (glazed) collectors in Los Angeles, New York, and Tampa. For photovoltaics, the 1986 DOE cost goals were assumed to have been realized, and for thermal energy collection two technologies were considered: a current technology based on metal and glass, and a future technology based on thin-film plastics. The study showed that for medium-temperature applications PV/T is not an attractive option in any of the locations studied. For low-temperature applications, PV/T appears to be marginally attractive.

ANDREWS,J.W.

1981-06-01T23:59:59.000Z

448

Brief Equivalence of hybrid dynamical models  

Science Conference Proceedings (OSTI)

This paper establishes equivalences among five classes of hybrid systems: mixed logical dynamical (MLD) systems, linear complementarity (LC) systems, extended linear complementarity (ELC) systems, piecewise affine (PWA) systems, and max-min-plus-scaling ... Keywords: Equivalent models, Hybrid systems, Piecewise affine systems

W. P. M. H. Heemels; B. De Schutter; A. Bemporad

2001-07-01T23:59:59.000Z

449

Solar Central Receiver Hybrid Power Systems sodium-cooled receiver concept. Final report. Volume II, Book 1. Conceptual design, Sections 1 through 4  

DOE Green Energy (OSTI)

The overall, long-term objective of the Solar Central Receiver Hybrid Power System program is to identify, characterize, and ultimately demonstrate the viability and cost effectiveness of solar/fossil, steam Rankine cycle, hybrid power systems that: (1) consist of a combined solar central receiver energy source and a nonsolar energy source at a single, common site, (2) may operate in the base, intermediate, and peaking capacity modes, (3) produce the rated output independent of variations in solar insolation, (4) provide a significant savings (50% or more) in fuel consumption, and (5) produce power at the minimum possible cost in mills/kWh. It is essential that these hybrid concepts be technically feasible and economically competitive with other systems in the near to mid-term time period (1985-1990) on a commercial scale. The program objective for Phase I is to identify and conceptually characterize solar/fossil steam Rankine cycle, commercial-scale, power plant systems that are economically viable and technically feasible. This volume presents in detail the market analysis, parametric analysis, and the selection process for the preferred system. (WHK)

None

1980-01-01T23:59:59.000Z

450

Technical Challenges of Plug-In Hybrid Electric Vehicles and Impacts to the US Power System: Distribution System Analysis  

DOE Green Energy (OSTI)

This report documents work conducted by Pacific Northwest National Laboratory (PNNL) for the Department of Energy (DOE) to address three basic questions concerning how typical existing electrical distribution systems would be impacted by the addition of PHEVs to residential loads.

Gerkensmeyer, Clint; Kintner-Meyer, Michael CW; DeSteese, John G.

2010-01-01T23:59:59.000Z

451

HYBRID ALARM SYSTEMS: COMBINING SPATIAL ALARMS AND ALARM LISTS FOR OPTIMIZED CONTROL ROOM OPERATION  

SciTech Connect

The US Department of Energy (DOE) is sponsoring research, development, and deployment on Light Water Reactor Sustainability (LWRS), in which the Idaho National Laboratory (INL) is working closely with nuclear utilities to develop technologies and solutions to help ensure the safe operational life extension of current nuclear power plants. One of the main areas of focus is control room modernization. Within control room modernization, alarm system upgrades present opportunities to meet the broader goals of the LWRS project in demonstrating the use and safety of the advanced instrumentation and control (I&C) technologies and the short-term and longer term objectives of the plant. In this paper, we review approaches for and human factors issues behind upgrading alarms in the main control room of nuclear power plants.

Ronald L. Boring; J.J. Persensky

2012-07-01T23:59:59.000Z

452

Laser Inertial Fusion-based Energy: Neutronic Design Aspects of a Hybrid Fusion-Fission Nuclear Energy System  

E-Print Network (OSTI)

4.3.3.4 Chamber Radius and Fusion Neutron Flux . . . . .1.1.3.2 Fusion Energy . . . . . . . . .1.1.3.3 Fission-Fusion Hybrids . . . . 1.2 Scope and Purpose

Kramer, Kevin James

2010-01-01T23:59:59.000Z

453

Hybrid vehicle-centric route guidance  

E-Print Network (OSTI)

This thesis proposes a hybrid route guidance system in which predictive guidance is generated in a centralized layer and revised in a reactive, decentralized layer that resides on-board the vehicle. This hybrid approach ...

Farver, Jennifer M. (Jennifer Margaret), 1976-

2005-01-01T23:59:59.000Z

454

Hybrid Fuel Cell Technology Overview  

SciTech Connect

For the purpose of this STI product and unless otherwise stated, hybrid fuel cell systems are power generation systems in which a high temperature fuel cell is combined with another power generating technology. The resulting system exhibits a synergism in which the combination performs with an efficiency far greater than can be provided by either system alone. Hybrid fuel cell designs under development include fuel cell with gas turbine, fuel cell with reciprocating (piston) engine, and designs that combine different fuel cell technologies. Hybrid systems have been extensively analyzed and studied over the past five years by the Department of Energy (DOE), industry, and others. These efforts have revealed that this combination is capable of providing remarkably high efficiencies. This attribute, combined with an inherent low level of pollutant emission, suggests that hybrid systems are likely to serve as the next generation of advanced power generation systems.

None available

2001-05-31T23:59:59.000Z

455

Final Report: Use of Graphite Foam as a Thermal Performance Enhancement of Heavy Hybrid Propulsion Systems  

DOE Green Energy (OSTI)

Oak Ridge National Laboratory's graphite foam has the potential to be used as a heat exchanger for the Army's Future Combat System Manned Ground Vehicle and thus has the potential to improve its thermal performance. The computational fluid dynamics (CFD) program FLOW3D was used to develop a new CFD model for the graphite foam to be used in the development of a proper heat exchanger. The program was calibrated by first measuring the properties of the solid foams and determining the parameters to be used in the CFD model. Then the model was used to predict within 5% error the performance of finned foam heat sinks. In addition, the f factors and j factors commonly used to predict pressure drop and heat transfer were calculated for both the solid and finned structures. There was some evidence that corrugating the foams would yield higher j/f ratios than state of the art heat exchangers, confirming previously measured data. Because the results show that the CFD model was validated, it is recommended that the funding for Phases 2 through 5 be approved for the design of both the finned heat exchanger using tubes and round fin structures and the solid foam design using corrugated foams. It was found that the new CFD model using FLOW3D can predict both solid foam heat transfer and finned foam heat transfer with the validated model parameters. In addition, it was found that the finned foam structures exhibited j/f ratios that indicate that significant heat transfer is occurring within the fin structures due to aerodynamically induced flow, which is not present in solid aluminum fin structures. It is possible that the foam surfaces can act as turbulators that increase heat transfer without affecting pressure drop, like the vortex generators seen in state of the art heat exchangers. These numbers indicate that the foam can be engineered into an excellent heat exchanger. It was also found that corrugating the solid foams would increase the j/f ratio dramatically, allowing the solid foams to compete directly with standard heat exchangers. Although corrugated L1 foam samples have not been produced (attempts are under way), it is possible that their j/f ratio can be even higher than those of the finned structures.

Klett, James William [ORNL; Conklin, Jim [ORNL

2011-06-01T23:59:59.000Z

456

A Bidirectional, Triple-Voltage DC-DC Converter for Hybrid and Fuel Cell Vehicle Power Systems  

Science Conference Proceedings (OSTI)

Electrical power systems in future hybrid and fuel cell vehicles may employ three voltage (14V, 42V and high voltage (HV)) nets. These will be necessary to accommodate existing 14V loads as well as efficiently handle new heavy loads at the 42V net and an electrical traction drive on the HV bus. A low-cost bi-directional dc-dc converter was proposed in (10) for connecting the three voltage nets. The converter consists of two half-bridges and a high-frequency transformer; thus minimizing the number of switching devices and their associated gate driver components. One salient feature is that the half-bridge on the 42V bus is also utilized to provide the 14V bus by operating its duty ratio around an atypical value of 1/3. This eliminates the need for an additional 14V/42V converter. Moreover, it makes use of the parasitic capacitance of the switches and the transformer leakage inductance for soft-switching; no extra active switches or passive resonant components are required. The use of half-bridges makes the topology suitable for interleaved multi-phase configurations as a means to increase the power level because the capacitor legs can be shared. This paper presents simulation and experimental results on an interleaved two-phase arrangement rated at 4.5 kW. Also discussed are the benefits of operating with the atypical duty ratio on the transformer and a preferred multi-phase configuration to minimize capacitor ripple currents.

Su, Gui-Jia [ORNL; Tang, Lixin [ORNL

2007-01-01T23:59:59.000Z

457

Present Status and Marketing Prospects of the Emerging Hybrid-Electric and Diesel Technologies to Reduce CO2 Emissions of New Light-Duty Vehicles in California  

E-Print Network (OSTI)

119, 2003 18. Hermance, D. , Toyota Hybrid System, 1999 SAEGasoline Engine for the Toyota Hybrid System, JSAE papereconomy and emissions of the Toyota and Honda Hybrid Cars (

Burke, Andy

2004-01-01T23:59:59.000Z

458

The Potential of Plug-in Hybrid and Battery Electric Vehicles as Grid Resources: the Case of a Gas and Petroleum Oriented Elecricity Generation System  

E-Print Network (OSTI)

Ferdowsi, M. (2007). Plug-hybrid vehicles A vision for thepower: battery, hybrid and fuel cell vehicles as resources2010). Plug-in hybrid electric vehicles as regulating power

Greer, Mark R

2012-01-01T23:59:59.000Z

459

The Potential of Plug-in Hybrid and Battery Electric Vehicles as Grid Resources: the Case of a Gas and Petroleum Oriented Elecricity Generation System  

E-Print Network (OSTI)

2010). Plug-in hybrid electric vehicles as regulating powervalue of plug-in hybrid electric vehicles as grid resources.of using plug-in hybrid electric vehicle battery packs for

Greer, Mark R

2012-01-01T23:59:59.000Z

460

Diagnostics for hybrid reactors  

SciTech Connect

The Hybrid Reactor(HR) can be considered an attractive actinide-burner or a fusion assisted transmutation for destruction of transuranic(TRU) nuclear waste. The hybrid reactor has two important subsystems: the tokamak neutron source and the blanket which includes a fuel zone where the TRU are placed and a tritium breeding zone. The diagnostic system for a HR must be as simple and robust as possible to monitor and control the plasma scenario, guarantee the protection of the machine and monitor the transmutation.

Orsitto, Francesco Paolo [ENEA Unita' Tecnica Fusione , Associazione ENEA-EURATOM sulla Fusione C R Frascati v E Fermi 45 00044 Frascati (Italy)

2012-06-19T23:59:59.000Z

Note: This page contains sample records for the topic "off-grid hybrid system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Hybrid Heterogeneous Energy Supply Networks Farinaz Koushanfar and Azalia Mirhoseini  

E-Print Network (OSTI)

-level system realization for a hybrid network of energy supply options [2]. Recently a hybrid battery-supercapacitor supercapacitor and solar energy generation system in optimizing system's efficiency and dynamic response time

462

Vehicle Technologies Office: Materials for Hybrid and Electric Drive  

NLE Websites -- All DOE Office Websites (Extended Search)

for Hybrid and for Hybrid and Electric Drive Systems to someone by E-mail Share Vehicle Technologies Office: Materials for Hybrid and Electric Drive System