National Library of Energy BETA

Sample records for distribution system efficiency

  1. Energy Efficient HVAC System for Distributed Cooling/Heating...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Efficient HVAC System for Distributed CoolingHeating with Thermoelectric Devices Energy Efficient HVAC System for Distributed CoolingHeating with Thermoelectric Devices 2012 DOE...

  2. Energy Efficiency of Distributed Environmental Control Systems

    SciTech Connect (OSTI)

    Khalifa, H. Ezzat; Isik, Can; Dannenhoffer, John F. III

    2011-02-23

    In this report, we present an analytical evaluation of the potential of occupant-regulated distributed environmental control systems (DECS) to enhance individual occupant thermal comfort in an office building with no increase, and possibly even a decrease in annual energy consumption. To this end we developed and applied several analytical models that allowed us to optimize comfort and energy consumption in partitioned office buildings equipped with either conventional central HVAC systems or occupant-regulated DECS. Our approach involved the following interrelated components: 1. Development of a simplified lumped-parameter thermal circuit model to compute the annual energy consumption. This was necessitated by the need to perform tens of thousands of optimization calculations involving different US climatic regions, and different occupant thermal preferences of a population of ~50 office occupants. Yearly transient simulations using TRNSYS, a time-dependent building energy modeling program, were run to determine the robustness of the simplified approach against time-dependent simulations. The simplified model predicts yearly energy consumption within approximately 0.6% of an equivalent transient simulation. Simulations of building energy usage were run for a wide variety of climatic regions and control scenarios, including traditional “one-size-fits-all” (OSFA) control; providing a uniform temperature to the entire building, and occupant-selected “have-it-your-way” (HIYW) control with a thermostat at each workstation. The thermal model shows that, un-optimized, DECS would lead to an increase in building energy consumption between 3-16% compared to the conventional approach depending on the climate regional and personal preferences of building occupants. Variations in building shape had little impact in the relative energy usage. 2. Development of a gradient-based optimization method to minimize energy consumption of DECS while keeping each occupant’s thermal dissatisfaction below a given threshold. The DECS energy usage was calculated using the simplified thermal model. OSFA control; providing a uniform temperature to the entire building, and occupant-selected HIYW control with a thermostat at each workstation were implemented for 3 cities representing 3 different climatic regions and control scenarios. It is shown that optimization allows DECS to deliver a higher level of individual and population thermal comfort while achieving annual energy savings between 14 and 26% compared to OSFA. The optimization model also allowed us to study the influence of the partitions’ thermal resistance and the variability of internal loads at each office. These influences didn’t make significant changes in the optimized energy consumption relative to OSFA. The results show that it is possible to provide thermal comfort for each occupant while saving energy compared to OSFA Furthermore, to simplify the implementation of this approach, a fuzzy logic system has been developed to generalize the overall optimization strategy. Its performance was almost as good as the gradient system. The fuzzy system provided thermal comfort to each occupant and saved energy compared to OSFA. The energy savings of the fuzzy system were not as high as for the gradient-optimized system, but the fuzzy system avoided complete connectivity, and the optimization did not have to be repeated for each population. 3. We employed a detailed CFD model of adjacent occupied cubicles to extend the thermal-circuit model in three significant ways: (a) relax the “office wall” requirement by allowing energy to flow between zones via advection as well as conduction, (b) improve the comfort model to account both for radiation as well as convection heat transfer, and (c) support ventilation systems in which the temperature is stratified, such as in underfloor air distribution systems. Initially, three-dimensional CFD simulations of several cubicle configurations, with an adjoining corridor, were performed both to understand the advection between cubicles and the

  3. Distributed Power Delivery for Energy Efficient and Low Power Systems

    E-Print Network [OSTI]

    Friedman, Eby G.

    Distributed Power Delivery for Energy Efficient and Low Power Systems Selc¸uk K¨ose Department are needed to determine the location of these on-chip power supplies and decoupling capacitors. In this paper, the optimal location of the power supplies and decoupling capacitors is determined for different size

  4. Harnessing metadata characteristics for efficient deduplication in distributed storage Systems

    E-Print Network [OSTI]

    Goldstein, Matthew (Matthew S.)

    2011-01-01

    As storage capacity requirements grow, storage systems are becoming distributed, and that distribution poses a challenge for space savings processes. In this thesis, I design and implement a mechanism for storing only a ...

  5. Energy Efficient Radio Resource Management in a Coordinated Multi-Cell Distributed Antenna System

    E-Print Network [OSTI]

    Yanikomeroglu, Halim

    Energy Efficient Radio Resource Management in a Coordinated Multi-Cell Distributed Antenna System efficient radio resource management are some of the energy saving methods. It is observed and two energy efficient radio resource management schemes are investigated; either ports can be switched

  6. IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS, MANUSCRIPT ID 1 Efficient Data Migration to Conserve Energy

    E-Print Network [OSTI]

    Bader, David A.

    and efficient data migrations to achieve the un- balanced data layouts. Motivation. The primary problemIEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS, MANUSCRIPT ID 1 Efficient Data Migration to high data migration overhead. To address this problem, we propose in this paper a new energy

  7. Practical Attacks on Decoy State Quantum Key Distribution Systems with Detector Efficiency Mismatch

    E-Print Network [OSTI]

    Fei Yangyang; Gao Ming; Wang Weilong; Li Chaobo; Ma Zhi

    2015-07-23

    To the active basis choice decoy state quantum key distribution systems with detector efficiency mismatch, we present a modified attack strategy, which is based on faked states attack, with quantum nondemolition measurement ability to restress the threat of detector efficiency mismatch. Considering that perfect quantum nondemolition measurement ability dose not exist in real life, we also propose a practical attack strategy using photon number resolving detectors. Theoretical analysis and numerical simulation results show that, without changing the channel, our attack strategies are serious threats to decoy state quantum key distribution systems. The eavesdropper may get some information ab out the secret key without causing any alarms. Besides, the lower bound of detector efficiency mismatch to run our modified faked states attack successfully with perfect quantum nondemolition measurement ability is also given out, which provides the producers of quantum key distribution systems with a reference and can be treated as the approximate secure bound of detector efficiency mismatch in decoy state quantum key distribution systems.

  8. To appear in Energy Efficient Distributed Computing Systems, Editors: A. Zomaya and Y-C Lee, Wiley-IEEE Computer Society Press, Aug. 2012 and Massoud Pedram2

    E-Print Network [OSTI]

    Pedram, Massoud

    To appear in Energy Efficient Distributed Computing Systems, Editors: A. Zomaya and Y-C Lee, Wiley #12;To appear in Energy Efficient Distributed Computing Systems, Editors: A. Zomaya and Y-C Lee, Wiley................................................................................................................................................19 #12;To appear in Energy Efficient Distributed Computing Systems, Editors: A. Zomaya and Y-C Lee

  9. Opportunities for Efficiency Improvements in the U.S. Electricity Transmission and Distribution System

    SciTech Connect (OSTI)

    Jackson, Roderick K.; Onar, Omer C.; Kirkham, Harold; Fisher, Emily; Burkes, Klaehn; Starke, Michael R.; Mohammed, Olama; Weeks, George

    2015-04-01

    Since 2000, more than 172 quads of electricity have been transmitted on the US transmission and distribution (T&D) grid. Given this significant amount of energy flow, establishing and maintaining an efficient T&D grid is paramount. As shown in the figure below, the total percentage of overall losses in the US electric grid is approximately 6% (5.12% in 2012) (30% lower than the world average since 2000). While these efficiency losses appear to be relatively small from a percentage perspective, the total estimated electricity loss during this time is 10.8 quads.

  10. Distributed Agent Search Efficiency 

    E-Print Network [OSTI]

    Murray, Christopher C

    2014-09-19

    Multi-agent systems where there exists a group of agents all working towards the same goal are gaining increased focus. One subset of these systems is groups of agents who have intermittent communication with one another. In an environment...

  11. IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS 1 EPPA: An Efficient and Privacy-Preserving

    E-Print Network [OSTI]

    Shen, Xuemin "Sherman"

    generation plants to customers) and demand-driven response. Smart grid combines traditional grid-Preserving Aggregation Scheme for Secure Smart Grid Communications Rongxing Lu, Member, IEEE, Xiaohui Liang, Student. In this paper, we propose an efficient and privacy-preserving aggregation scheme, named EPPA, for smart grid

  12. A High Efficiency DC-DC Converter Topology Suitable for Distributed Large Commercial and Utility Scale PV Systems

    SciTech Connect (OSTI)

    Mohammed S. Agamy; Maja Harfman-Todorovic; Ahmed Elasser; Robert L. Steigerwald; Juan A. Sabate; Song Chi; Adam J. McCann; Li Zhang; Frank Mueller

    2012-09-01

    In this paper a DC-DC power converter for distributed photovoltaic plant architectures is presented. The proposed converter has the advantages of simplicity, high efficiency, and low cost. High efficiency is achieved by having a portion of the input PV power directly fed forward to the output without being processed by the converter. The operation of this converter also allows for a simplified maximum power point tracker design using fewer measurements

  13. A Content Propagation Metric for Efficient Content Distribution

    E-Print Network [OSTI]

    Keinan, Alon

    A Content Propagation Metric for Efficient Content Distribution Ryan S. Peterson Cornell University@cs.cornell.edu ABSTRACT Efficient content distribution in large networks comprising data- centers, end hosts, and distributed in-network caches is a diffi- cult problem. Existing systems rely on mechanisms and metrics

  14. Efficient and Accurate Protocols for Distributed Delaunay Triangulation under Churn

    E-Print Network [OSTI]

    Lam, Simon S.

    Efficient and Accurate Protocols for Distributed Delaunay Triangulation under Churn Dong-Young Lee. For a system under churn, it is impossible to maintain a correct distributed DT continually. We define of protocols maintains high accuracy for systems under churn and each system converges to 100% accuracy after

  15. DOE ZERH Webinar: Efficient Hot Water Distribution I -- What...

    Broader source: Energy.gov (indexed) [DOE]

    challenges. Things like how do we design energy- efficient, high-performance hot water distribution systems. So that brings us to this webinar series where we are going to...

  16. Energy Efficiency in Cryogenic Fractionation Through Distributive Distillation 

    E-Print Network [OSTI]

    Carradine, C. R.; McCue, R. H.

    1992-01-01

    The Advanced Recovery System (ARS) is a patented process that uses the principle of distributed distillation to achieve energy efficiency in the olefins process. This paper describes the concept of ARS and how, by integrating the chill...

  17. Probabilistic Failure Detection for Efficient Distributed Storage Maintenance* , Zhi Yang*

    E-Print Network [OSTI]

    Almeroth, Kevin C.

    avail- ability. Node failures can be transient or permanent. While the system must generate new replicasProbabilistic Failure Detection for Efficient Distributed Storage Maintenance* Jing Tian* , Zhi@cs.ucsb.edu Abstract Distributed storage systems often use data replica- tion to mask failures and guarantee high data

  18. Distributed Theorem Proving for Distributed Hybrid Systems

    E-Print Network [OSTI]

    Platzer, André

    system with a varying number of arbitrarily many cars. 1 Introduction Hybrid systems with joint discrete a multi-agent system, e.g., distributed car control systems. Such systems form distributed hybrid systemsDistributed Theorem Proving for Distributed Hybrid Systems David W. Renshaw, Sarah M. Loos

  19. High Efficiency Integrated Space Conditioning, Water Heating and Air Distribution System for HUD-Code Manufactured Housing

    SciTech Connect (OSTI)

    Henry DeLima; Joe Akin; Joseph Pietsch

    2008-09-14

    Recognizing the need for new space conditioning and water heating systems for manufactured housing, DeLima Associates assembled a team to develop a space conditioning system that would enhance comfort conditions while also reducing energy usage at the systems level. The product, Comboflair® was defined as a result of a needs analysis of project sponsors and industry stakeholders. An integrated system would be developed that would combine a packaged airconditioning system with a small-duct, high-velocity air distribution system. In its basic configuration, the source for space heating would be a gas water heater. The complete system would be installed at the manufactured home factory and would require no site installation work at the homesite as is now required with conventional split-system air conditioners. Several prototypes were fabricated and tested before a field test unit was completed in October 2005. The Comboflair® system, complete with ductwork, was installed in a 1,984 square feet, double-wide manufactured home built by Palm Harbor Homes in Austin, TX. After the home was transported and installed at a Palm Harbor dealer lot in Austin, TX, a data acquisition system was installed for remote data collection. Over 60 parameters were continuously monitored and measurements were transmitted to a remote site every 15 minutes for performance analysis. The Comboflair® system was field tested from February 2006 until April 2007. The cooling system performed in accordance with the design specifications. The heating system initially could not provide the needed capacity at peak heating conditions until the water heater was replaced with a higher capacity standard water heater. All system comfort goals were then met. As a result of field testing, we have identified improvements to be made to specific components for incorporation into production models. The Comboflair® system will be manufactured by Unico, Inc. at their new production facility in St. Louis, MO. The product will be initially launched in the hot-humid climates of the southern U.S.

  20. Communication-Efficient Distributed Dual Coordinate Ascent

    E-Print Network [OSTI]

    McAuliffe, Jon

    Communication-Efficient Distributed Dual Coordinate Ascent Martin Jaggi ETH Zurich Virginia Smith Thomas Hofmann ETH Zurich Michael I. Jordan UC Berkeley Abstract Communication remains the most learning. In this pa- per, we propose a communication-efficient framework, COCOA, that uses local

  1. FRIB cryogenic distribution system

    SciTech Connect (OSTI)

    Ganni, V.; Dixon, K.; Laverdure, N.; Knudsen, P.; Arenius, D. [Thomas Jefferson National Accelerator Facility (JLab), Newport News, VA 23606 (United States); Barrios, M.; Jones, S.; Johnson, M.; Casagrande, F. [Facility for Rare Isotope Beams (FRIB), Michigan State University, East Lansing, MI 48824 (United States)

    2014-01-29

    The Michigan State University Facility for Rare Isotope Beams (MSU-FRIB) helium distribution system has been revised to include bayonet/warm valve type disconnects between each cryomodule and the transfer line distribution system, similar to the Thomas Jefferson National Accelerator Facility (JLab) and the Spallation Neutron Source (SNS) cryogenic distribution systems. The heat loads at various temperature levels and some of the features in the design of the distribution system are outlined. The present status, the plans for fabrication, and the procurement approach for the helium distribution system are also included.

  2. FRIB cryogenic distribution system

    SciTech Connect (OSTI)

    Ganni, Venkatarao [JLAB; Dixon, Kelly D. [JLAB; Laverdure, Nathaniel A. [JLAB; Knudsen, Peter N. [JLAB; Arenius, Dana M. [JLAB; Barrios, Matthew N. [Michigan State; Jones, S. [Michigan State; Johnson, M. [Michigan State; Casagrande, Fabio [Michigan State

    2014-01-01

    The Michigan State University Facility for Rare Isotope Beams (MSU-FRIB) helium distribution system has been revised to include bayonet/warm valve type disconnects between each cryomodule and the transfer line distribution system, similar to the Thomas Jefferson National Accelerator Facility (JLab) and the Spallation Neutron Source (SNS) cryogenic distribution systems. The heat loads at various temperature levels and some of the features in the design of the distribution system are outlined. The present status, the plans for fabrication, and the procurement approach for the helium distribution system are also included.

  3. Communication-Efficient Distributed Monitoring of Thresholded Counts

    E-Print Network [OSTI]

    Cormode, Graham

    this distributed networked systems, a princi- pal concern is monitoring: either monitoring the environment surCommunication-Efficient Distributed Monitoring of Thresholded Counts Ram Keralapura ECE Department cormode@lucent.com Jai Ramamirtham Bell Laboratories Bangalore, India jai@lucent.com ABSTRACT Monitoring

  4. DOE ZERH Webinar: Efficient Hot Water Distribution I: What's at Stake

    Broader source: Energy.gov [DOE]

    Zero Energy Ready Homes include critical systems to ensure both energy efficiency and performance.  Hot water distribution is one of these critical systems – affecting energy use , water...

  5. DOE ZERH Webinar: Efficient Hot Water Distribution II: How to Get it Right

    Broader source: Energy.gov [DOE]

    Zero Energy Ready Homes include critical systems to ensure both energy efficiency and performance.  Hot water distribution is one of these critical systems – affecting energy use , water...

  6. Cooling water distribution system

    DOE Patents [OSTI]

    Orr, Richard (Pittsburgh, PA)

    1994-01-01

    A passive containment cooling system for a nuclear reactor containment vessel. Disclosed is a cooling water distribution system for introducing cooling water by gravity uniformly over the outer surface of a steel containment vessel using an interconnected series of radial guide elements, a plurality of circumferential collector elements and collector boxes to collect and feed the cooling water into distribution channels extending along the curved surface of the steel containment vessel. The cooling water is uniformly distributed over the curved surface by a plurality of weirs in the distribution channels.

  7. Ductless Hydronic Distribution Systems

    Broader source: Energy.gov (indexed) [DOE]

    Buildings Technologies Program Date: November 8, 2011 Ductless Hydronic Distribution Systems Welcome to the Webinar We will start at 1:00 PM Eastern Time Be sure that you are...

  8. Distributional and Efficiency Impacts of Clean and Renewable Energy Standards

    E-Print Network [OSTI]

    Distributional and Efficiency Impacts of Clean and Renewable Energy Standards for Electricity on recycled paper #12;Distributional and Efficiency Impacts of Clean and Renewable Energy Standards supply and demand, including renewable energy resources and generating technologies, while representing

  9. Distributed Energy-Efficient Hierarchical Clustering for Wireless Sensor Networks

    E-Print Network [OSTI]

    Holliday, JoAnne

    Distributed Energy-Efficient Hierarchical Clustering for Wireless Sensor Networks Ping Ding, Jo important. In this paper, we propose a distributed weight-based energy-efficient hierarchical clustering of the network topology. Younis and Fahmy [4] propose a Hybrid Energy-Efficient Distributed clustering (HEED

  10. Optimizing Water Efficiency in Distributed Data Centers Shaolei Ren

    E-Print Network [OSTI]

    Ren, Shaolei

    Optimizing Water Efficiency in Distributed Data Centers Shaolei Ren School of Computing embarrassing lack of attention to the enormity of data center water consumption despite its emergence water efficiency. We first identify two characteristics of data center water efficiency: water

  11. Optimization of distribution transformer efficiency characteristics. Final report, March 1979

    SciTech Connect (OSTI)

    Not Available

    1980-06-01

    A method for distribution transformer loss evaluation was derived. The total levalized annual cost method was used and was extended to account properly for conditions of energy cost inflation, peak load growth, and transformer changeout during the evaluation period. The loss costs included were the no-load and load power losses, no-load and load reactive losses, and the energy cost of regulation. The demand and energy components of loss costs were treated separately to account correctly for the diversity of load losses and energy cost inflation. The complete distribution transformer loss evaluation equation is shown, with the nomenclature and definitions for the parameters provided. Tasks described are entitled: Establish Loss Evaluation Techniques; Compile System Cost Parameters; Compile Load Parameters and Loading Policies; Develop Transformer Cost/Performance Relationship; Define Characteristics of Multiple Efficiency Transformer Package; Minimize Life Cycle Cost Based on Single Efficiency Characteristic Transformer Design; Minimize Life Cycle Cost Based on Multiple Efficiency Characteristic Transformer Design; and Interpretation.

  12. Distributed Optimization System

    DOE Patents [OSTI]

    Hurtado, John E. (Albuquerque, NM); Dohrmann, Clark R. (Albuquerque, NM); Robinett, III, Rush D. (Tijeras, NM)

    2004-11-30

    A search system and method for controlling multiple agents to optimize an objective using distributed sensing and cooperative control. The search agent can be one or more physical agents, such as a robot, and can be software agents for searching cyberspace. The objective can be: chemical sources, temperature sources, radiation sources, light sources, evaders, trespassers, explosive sources, time dependent sources, time independent sources, function surfaces, maximization points, minimization points, and optimal control of a system such as a communication system, an economy, a crane, and a multi-processor computer.

  13. PANOPTICON: An Omniscient Lock Broker for Efficient Distributed Transactions in the Datacenter

    E-Print Network [OSTI]

    Krovi, Venkat

    PANOPTICON: An Omniscient Lock Broker for Efficient Distributed Transactions in the Datacenter Abstract For datacenter applications that require tight synchroniza- tion, transactions are commonly execution is a big challenge for distributed systems programming and datacenter computing in par- ticular

  14. Efficiency in Quantum Key Distribution Protocols using entangled Gaussian states

    E-Print Network [OSTI]

    Carles Rodó

    2010-05-14

    Efficiency is a key issue in any real implementation of a cryptographic protocol since the physical resources are not unlimited. We will first show that Quantum Key Distribution is possible with an "Entanglement based" scheme with NPPT symmetric Gaussian states in spite of the fact that these systems cannot be distilled with Gaussian operations (they are all bound entangled). In this work we analyze the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we prove that it is possible to distill efficiently a secret key secure against finite coherent attacks from sufficiently entangled Gaussian states with non-positive partial transposition. Moreover, all such states allow for efficient key distillation, when the eavesdropper is assumed to perform individual attacks before in an efficient way.

  15. Measuring Advances in HVAC Distribution System Design

    SciTech Connect (OSTI)

    Franconi, E.

    1998-05-01

    Substantial commercial building energy savings have been achieved by improving the performance of the HV AC distribution system. The energy savings result from distribution system design improvements, advanced control capabilities, and use of variable-speed motors. Yet, much of the commercial building stock remains equipped with inefficient systems. Contributing to this is the absence of a definition for distribution system efficiency as well as the analysis methods for quantifying performance. This research investigates the application of performance indices to assess design advancements in commercial building thermal distribution systems. The index definitions are based on a first and second law of thermodynamics analysis of the system. The second law or availability analysis enables the determination of the true efficiency of the system. Availability analysis is a convenient way to make system efficiency comparisons since performance is evaluated relative to an ideal process. A TRNSYS simulation model is developed to analyze the performance of two distribution system types, a constant air volume system and a variable air volume system, that serve one floor of a large office building. Performance indices are calculated using the simulation results to compare the performance of the two systems types in several locations. Changes in index values are compared to changes in plant energy, costs, and carbon emissions to explore the ability of the indices to estimate these quantities.

  16. Quality monitored distributed voting system

    DOE Patents [OSTI]

    Skogmo, D.

    1997-03-18

    A quality monitoring system can detect certain system faults and fraud attempts in a distributed voting system. The system uses decoy voters to cast predetermined check ballots. Absent check ballots can indicate system faults. Altered check ballots can indicate attempts at counterfeiting votes. The system can also cast check ballots at predetermined times to provide another check on the distributed voting system. 6 figs.

  17. Quality monitored distributed voting system

    DOE Patents [OSTI]

    Skogmo, David (Albuquerque, NM)

    1997-01-01

    A quality monitoring system can detect certain system faults and fraud attempts in a distributed voting system. The system uses decoy voters to cast predetermined check ballots. Absent check ballots can indicate system faults. Altered check ballots can indicate attempts at counterfeiting votes. The system can also cast check ballots at predetermined times to provide another check on the distributed voting system.

  18. Distributed road assessment system

    DOE Patents [OSTI]

    Beer, N. Reginald; Paglieroni, David W

    2014-03-25

    A system that detects damage on or below the surface of a paved structure or pavement is provided. A distributed road assessment system includes road assessment pods and a road assessment server. Each road assessment pod includes a ground-penetrating radar antenna array and a detection system that detects road damage from the return signals as the vehicle on which the pod is mounted travels down a road. Each road assessment pod transmits to the road assessment server occurrence information describing each occurrence of road damage that is newly detected on a current scan of a road. The road assessment server maintains a road damage database of occurrence information describing the previously detected occurrences of road damage. After the road assessment server receives occurrence information for newly detected occurrences of road damage for a portion of a road, the road assessment server determines which newly detected occurrences correspond to which previously detected occurrences of road damage.

  19. Pupillary efficient lighting system

    DOE Patents [OSTI]

    Berman, Samuel M. (San Francisco, CA); Jewett, Don L. (Mill Valley, CA)

    1991-01-01

    A lighting system having at least two independent lighting subsystems each with a different ratio of scotopic illumination to photopic illumination. The radiant energy in the visible region of the spectrum of the lighting subsystems can be adjusted relative to each other so that the total scotopic illumination of the combined system and the total photopic illumination of the combined system can be varied independently. The dilation or contraction of the pupil of an eye is controlled by the level of scotopic illumination and because the scotopic and photopic illumination can be separately controlled, the system allows the pupil size to be varied independently of the level of photopic illumination. Hence, the vision process can be improved for a given level of photopic illumination.

  20. Onsite Wastewater Treatment Systems: Spray Distribution System 

    E-Print Network [OSTI]

    Lesikar, Bruce J.

    2008-10-23

    Spray distribution systems for wastewater are much like lawn sprinkler systems, in that they spray treated wastewater over the surface of a yard. This publication explains how spray distribution systems work, what their design requirements are...

  1. A Distributed System for Cooperative MIMO Transmissions

    E-Print Network [OSTI]

    Kalyanaraman, Shivkumar

    a distributed system for facilitating cooperative MIMO transmissions in networks without multiple antenna diversity can be leveraged at the network, link or physical layers to provide energy efficient transmissions for reliable low-power transmissions. The rest of this paper is organized as follows: the proposed system

  2. Improving Energy Efficiency by Developing Components for Distributed...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    preserving occupant comfort. deer12chen.pdf More Documents & Publications Improving Energy Efficiency by Developing Components for Distributed Cooling and Heating Based on...

  3. Improving Energy Efficiency by Developing Components for Distributed...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Modeling Thermoelectric (TE) HVAC Improving Energy Efficiency by Developing Components for Distributed Cooling and Heating Based on Thermal Comfort Modeling Thermoelectric (TE)...

  4. Improving Energy Efficiency by Developing Components for Distributed...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Thermoelectric (TE) HVAC Improving Energy Efficiency by Developing Components for Distributed Cooling and Heating Based on Thermal Comfort Modeling Thermoelectric (TE) HVAC...

  5. Efficient Sensor Placement Optimization for Securing Large Water Distribution Networks

    E-Print Network [OSTI]

    Pratt, Vaughan

    Efficient Sensor Placement Optimization for Securing Large Water Distribution Networks Andreas Abstract: The problem of deploying sensors in a large water distribution network is considered, in order water--exhibits an important diminishing returns effect called submodularity. The submodularity

  6. Energy Efficient Nanoelectronic System Design

    E-Print Network [OSTI]

    Mohanty, Saraju P.

    Example Electronic System: Secure Digital Camera Power Manag ement Unit (PMU) 05/21/2013 17 #12;Power Management Unit (PMU) Manages the power distribution to the various subsyst

  7. Strategy Guideline: Compact Air Distribution Systems

    SciTech Connect (OSTI)

    Burdick, A.

    2013-06-01

    This Strategy Guideline discusses the benefits and challenges of using a compact air distribution system to handle the reduced loads and reduced air volume needed to condition the space within an energy efficient home. Traditional systems sized by 'rule of thumb' (i.e., 1 ton of cooling per 400 ft2 of floor space) that 'wash' the exterior walls with conditioned air from floor registers cannot provide appropriate air mixing and moisture removal in low-load homes. A compact air distribution system locates the HVAC equipment centrally with shorter ducts run to interior walls, and ceiling supply outlets throw the air toward the exterior walls along the ceiling plane; alternatively, high sidewall supply outlets throw the air toward the exterior walls. Potential drawbacks include resistance from installing contractors or code officials who are unfamiliar with compact air distribution systems, as well as a lack of availability of low-cost high sidewall or ceiling supply outlets to meet the low air volumes with good throw characteristics. The decision criteria for a compact air distribution system must be determined early in the whole-house design process, considering both supply and return air design. However, careful installation of a compact air distribution system can result in lower material costs from smaller equipment, shorter duct runs, and fewer outlets; increased installation efficiencies, including ease of fitting the system into conditioned space; lower loads on a better balanced HVAC system, and overall improved energy efficiency of the home.

  8. Enabling efficiency in data center systems

    E-Print Network [OSTI]

    McCullough, John Carleton; McCullough, John Carleton

    2012-01-01

    Tool for Large-Scale Storage Systems. In ACM Transactions onfor Distributed Storage Systems. In Proceedings of theBigtable: A distributed Storage System for Structured Data.

  9. Toward Energy-Efficient and Distributed Mobile Health Monitoring Using Parallel Offloading

    E-Print Network [OSTI]

    Potkonjak, Miodrag

    monitoring systems, Chowdhury et al. proposed MediAlly, a middleware for supporting energy-efficient, long1 Toward Energy-Efficient and Distributed Mobile Health Monitoring Using Parallel Offloading Jong is emerging, little effort has been investigated in an energy-efficient management of sensor information

  10. Efficient Coordinated Power Distribution on Private Infrastructure

    E-Print Network [OSTI]

    Boutilier, Craig

    sources --most no- tably wind and solar power. Installation capacity is often higher in rural areas where country where a significant amount of power is produced by wind farms, solar panels or biofuels additional distribution capacity, especially in the presence of increasingly distributed, unreliable

  11. Information efficiency in hyperspectral imaging systems

    E-Print Network [OSTI]

    Reichenbach, Stephen E.

    Information efficiency in hyperspectral imaging systems Stephen E. Reichenbach University develop a method for assessing the in- formation density and efficiency of hyperspectral imaging systems width can efficiently gather information about a scene by allocating bandwidth among the bands according

  12. Energy-efficient control of a smart grid with sustainable homes based on distributing risk

    E-Print Network [OSTI]

    Ono, Masahiro, S.M. Massachusetts Institute of Technology

    2012-01-01

    The goal of this thesis is to develop a distributed control system for a smart grid with sustainable homes. A central challenge is how to enhance energy efficiency in the presence of uncertainty. A major source of uncertainty ...

  13. Development of an Integrated Distribution Management System

    SciTech Connect (OSTI)

    Schatz, Joe E.

    2010-10-20

    This final report details the components, functionality, costs, schedule and benefits of developing an Integrated Distribution Management System (IDMS) for power distribution system operation. The Distribution Automation (DA) and Supervisory Control and Data Acquisition (SCADA) systems used by electric power companies to manage the distribution of electric power to retail energy consumers are vital components of the Nation’s critical infrastructure. Providing electricity is an essential public service and a disruption in that service, if not quickly restored, could threaten the public safety and the Nation’s economic security. Our Nation’s economic prosperity and quality of life have long depended on the essential services that utilities provide; therefore, it is necessary to ensure that electric utilities are able to conduct their operations safely and efficiently. A fully integrated technology of applications is needed to link various remote sensing, communications and control devices with other information tools that help guide Power Distribution Operations personnel. A fully implemented IDMS will provide this, a seamlessly integrated set of applications to raise electric system operating intelligence. IDMS will enhance DA and SCADA through integration of applications such as Geographic Information Systems, Outage Management Systems, Switching Management and Analysis, Operator Training Simulator, and other Advanced Applications, including unbalanced load flow and fault isolation/service restoration. These apps are capable of utilizing and obtaining information from appropriately installed DER, and by integrating disparate systems, the Distribution Operators will benefit from advanced capabilities when analyzing, controlling and operating the electric system.

  14. Aruna Ravinagarajan System Energy Efficiency Lab

    E-Print Network [OSTI]

    Zhou, Yuanyuan

    Aruna Ravinagarajan System Energy Efficiency Lab Aruna Ravinagarajan Advisor : Prof. Tajana Simunic of monitoring a structure over time and identifying damage System Energy Efficiency Lab damage A wireless sensor Efficiency Lab #12;SHM ­ How is it done?SHM ­ How is it done? System Energy Efficiency Lab Stuart G Taylor

  15. DOE Zero Energy Ready Home Efficient Hot Water Distribution I...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    I -- What's At Stake Webinar (Text Version) DOE Zero Energy Ready Home Efficient Hot Water Distribution I -- What's At Stake Webinar (Text Version) Below is the text version of the...

  16. Evaluation of Hydraulic Efficiency of Disinfection Systems Based on

    E-Print Network [OSTI]

    Venayagamoorthy, Subhas Karan

    an alternative measure of hydraulic efficiency, the ratio t10/t90, where t10 andt90 arethetimetakenfor10and90Evaluation of Hydraulic Efficiency of Disinfection Systems Based on Residence Time Distribution, Colorado 80523-1372, United States Received August 19, 2010. Revised manuscript received November 2, 2010

  17. UNCORRECTEDPROOF The Distribution System

    E-Print Network [OSTI]

    Pennycook, Steve

    to the electric energy industry as wireless telephony has been to consumer communications. An electricity market the electrical design and operation of fossil fuel and nuclear generating stations, performance optimization. Kirby, a frequent contributor to The Electricity Journal, is Director of the ORNL's Power Systems

  18. Improving Energy Efficiency by Developing Components for Distributed...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Develop distributed HVAC components to supplement the central HVAC system to reduce the energy required by current compressed gas air conditioners by at least one-third....

  19. Efficiency in Quantum Key Distribution Protocols with Entangled Gaussian States

    E-Print Network [OSTI]

    C. Rodó; O. Romero-Isart; K. Eckert; A. Sanpera

    2007-03-21

    Quantum key distribution (QKD) refers to specific quantum strategies which permit the secure distribution of a secret key between two parties that wish to communicate secretly. Quantum cryptography has proven unconditionally secure in ideal scenarios and has been successfully implemented using quantum states with finite (discrete) as well as infinite (continuous) degrees of freedom. Here, we analyze the efficiency of QKD protocols that use as a resource entangled gaussian states and gaussian operations only. In this framework, it has already been shown that QKD is possible (M. Navascu\\'es et al. Phys. Rev. Lett. 94, 010502 (2005)) but the issue of its efficiency has not been considered. We propose a figure of merit (the efficiency $E$) to quantify the number of classical correlated bits that can be used to distill a key from a sample of $N$ entangled states. We relate the efficiency of the protocol to the entanglement and purity of the states shared between the parties.

  20. Advanced Energy Efficient Roof System

    SciTech Connect (OSTI)

    Jane Davidson

    2008-09-30

    Energy consumption in buildings represents 40 percent of primary U.S. energy consumption, split almost equally between residential (22%) and commercial (18%) buildings.1 Space heating (31%) and cooling (12%) account for approximately 9 quadrillion Btu. Improvements in the building envelope can have a significant impact on reducing energy consumption. Thermal losses (or gains) from the roof make up 14 percent of the building component energy load. Infiltration through the building envelope, including the roof, accounts for an additional 28 percent of the heating loads and 16 percent of the cooling loads. These figures provide a strong incentive to develop and implement more energy efficient roof systems. The roof is perhaps the most challenging component of the building envelope to change for many reasons. The engineered roof truss, which has been around since 1956, is relatively low cost and is the industry standard. The roof has multiple functions. A typical wood frame home lasts a long time. Building codes vary across the country. Customer and trade acceptance of new building products and materials may impede market penetration. The energy savings of a new roof system must be balanced with other requirements such as first and life-cycle costs, durability, appearance, and ease of construction. Conventional residential roof construction utilizes closely spaced roof trusses supporting a layer of sheathing and roofing materials. Gypsum board is typically attached to the lower chord of the trusses forming the finished ceiling for the occupied space. Often in warmer climates, the HVAC system and ducts are placed in the unconditioned and otherwise unusable attic. High temperature differentials and leaky ducts result in thermal losses. Penetrations through the ceilings are notoriously difficult to seal and lead to moisture and air infiltration. These issues all contribute to greater energy use and have led builders to consider construction of a conditioned attic. The options considered to date are not ideal. One approach is to insulate between the trusses at the roof plane. The construction process is time consuming and costs more than conventional attic construction. Moreover, the problems of air infiltration and thermal bridges across the insulation remain. Another approach is to use structurally insulated panels (SIPs), but conventional SIPs are unlikely to be the ultimate solution because an additional underlying support structure is required except for short spans. In addition, wood spline and metal locking joints can result in thermal bridges and gaps in the foam. This study undertook a more innovative approach to roof construction. The goal was to design and evaluate a modular energy efficient panelized roof system with the following attributes: (1) a conditioned and clear attic space for HVAC equipment and additional finished area in the attic; (2) manufactured panels that provide structure, insulation, and accommodate a variety of roofing materials; (3) panels that require support only at the ends; (4) optimal energy performance by minimizing thermal bridging and air infiltration; (5) minimal risk of moisture problems; (6) minimum 50-year life; (7) applicable to a range of house styles, climates and conditions; (8) easy erection in the field; (9) the option to incorporate factory-installed solar systems into the panel; and (10) lowest possible cost. A nationwide market study shows there is a defined market opportunity for such a panelized roof system with production and semi-custom builders in the United States. Senior personnel at top builders expressed interest in the performance attributes and indicate long-term opportunity exists if the system can deliver a clear value proposition. Specifically, builders are interested in (1) reducing construction cycle time (cost) and (2) offering increased energy efficiency to the homebuyer. Additional living space under the roof panels is another low-cost asset identified as part of the study. The market potential is enhanced through construction activity levels in target marke

  1. A Self-Adaptive Middleware for Efficient Routing in Distributed Sensor Networks

    E-Print Network [OSTI]

    Duan, Sisi; Sun, Jingtao

    2015-01-01

    and D. Rubenstein: Energy-efficient computing for wildlifeIsland Hop- ping: Efficient mobility-assisted forwarding inAdaptive Middleware for Efficient Routing in Distributed

  2. Building America Webinar: Ductless Hydronic Distribution Systems...

    Energy Savers [EERE]

    Ductless Hydronic Distribution Systems Building America Webinar: Ductless Hydronic Distribution Systems This webinar was presented by research team Alliance for Residential...

  3. Improving pumping system efficiency at coal plants

    SciTech Connect (OSTI)

    Livoti, W.C.; McCandless, S.; Poltorak, R. [Baldor Electric Co. (United States)

    2009-03-15

    The industry must employ ultramodern technologies when building or upgrading power plant pumping systems thereby using fuels more efficiently. The article discusses the uses and efficiencies of positive displacement pumps, centrifugal pumps and multiple screw pumps. 1 ref., 4 figs.

  4. Distributed Power Electronics for PV Systems (Presentation)

    SciTech Connect (OSTI)

    Deline, C.

    2011-12-01

    An overview of the benefits and applications of microinverters and DC power optimizers in residential systems. Some conclusions from this report are: (1) The impact of shade is greater than just the area of shade; (2) Additional mismatch losses include panel orientation, panel distribution, inverter voltage window, soiling; (3) Per-module devices can help increase performance, 4-12% or more depending on the system; (4) Value-added benefits (safety, monitoring, reduced design constraints) are helping their adoption; and (5) The residential market is growing rapidly. Efficiency increases, cost reductions are improving market acceptance. Panel integration will further reduce price and installation cost. Reliability remains an unknown.

  5. Enhanced distributed energy resource system

    DOE Patents [OSTI]

    Atcitty, Stanley (Albuquerque, NM); Clark, Nancy H. (Corrales, NM); Boyes, John D. (Albuquerque, NM); Ranade, Satishkumar J. (Las Cruces, NM)

    2007-07-03

    A power transmission system including a direct current power source electrically connected to a conversion device for converting direct current into alternating current, a conversion device connected to a power distribution system through a junction, an energy storage device capable of producing direct current connected to a converter, where the converter, such as an insulated gate bipolar transistor, converts direct current from an energy storage device into alternating current and supplies the current to the junction and subsequently to the power distribution system. A microprocessor controller, connected to a sampling and feedback module and the converter, determines when the current load is higher than a set threshold value, requiring triggering of the converter to supply supplemental current to the power transmission system.

  6. Efficient Thermally Variable Cooling System

    Broader source: Energy.gov [DOE]

    Poster presented at the 16th Directions in Engine-Efficiency and Emissions Research (DEER) Conference in Detroit, MI, September 27-30, 2010.

  7. Test for Pumping System Efficiency | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Test for Pumping System Efficiency Test for Pumping System Efficiency This tip sheet discusses important considerations when conducting pumping system efficiency tests. PUMPING...

  8. Distributional and Efficiency Impacts of Clean and Renewable Energy Standards for Electricity

    E-Print Network [OSTI]

    Rausch, Sebastian

    2012-07-17

    We examine the efficiency and distributional impacts of greenhouse gas policies directed toward the electricity

  9. Water Heaters and Hot Water Distribution Systems

    E-Print Network [OSTI]

    Lutz, Jim

    2012-01-01

    distribution system, ground-source heat pump and ground heatdistribution systems, ground-source heat pumps and ground

  10. Distributed Termination Detection for Dynamic Systems

    E-Print Network [OSTI]

    Dhamdhere, Dhananjay Madhav

    systems, Termination detection. \\Lambda Address all correspondence to this author. 1 #12; Distributed

  11. High Efficiency Low Emission Refrigeration System

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Efficiency Low Emission Refrigeration System 2014 Building Technologies Office Peer Review Brian Fricke, frickeba@ornl.gov Oak Ridge National Laboratory Project Summary Timeline:...

  12. Webinar: Highly Efficient Solar Thermochemical Reaction Systems

    Broader source: Energy.gov [DOE]

    Video recording and text version of the Fuel Cell Technologies Office webinar titled "Highly Efficient Solar Thermochemical Reaction Systems," originally presented on January 13, 2015.

  13. Distributed optimization system and method

    DOE Patents [OSTI]

    Hurtado, John E.; Dohrmann, Clark R.; Robinett, III, Rush D.

    2003-06-10

    A search system and method for controlling multiple agents to optimize an objective using distributed sensing and cooperative control. The search agent can be one or more physical agents, such as a robot, and can be software agents for searching cyberspace. The objective can be: chemical sources, temperature sources, radiation sources, light sources, evaders, trespassers, explosive sources, time dependent sources, time independent sources, function surfaces, maximization points, minimization points, and optimal control of a system such as a communication system, an economy, a crane, and a multi-processor computer.

  14. ENERGY EFFICIENCY AND ENVIRONMENTALLY FRIENDLY DISTRIBUTED ENERGY STORAGE BATTERY

    SciTech Connect (OSTI)

    LANDI, J.T.; PLIVELICH, R.F.

    2006-04-30

    Electro Energy, Inc. conducted a research project to develop an energy efficient and environmentally friendly bipolar Ni-MH battery for distributed energy storage applications. Rechargeable batteries with long life and low cost potentially play a significant role by reducing electricity cost and pollution. A rechargeable battery functions as a reservoir for storage for electrical energy, carries energy for portable applications, or can provide peaking energy when a demand for electrical power exceeds primary generating capabilities.

  15. SILENCE: Distributed Adaptive Sampling for Sensor-based Autonomic Systems

    E-Print Network [OSTI]

    Pompili, Dario

    SILENCE: Distributed Adaptive Sampling for Sensor-based Autonomic Systems Eun Kyung Lee}@cac.rutgers.edu ABSTRACT Adaptive sampling and sleep scheduling can help realize the much needed resource efficiency phenomena. This paper presents a data-centric approach to distributed adaptive sampling aimed at minimizing

  16. Assessing the Energy Efficiency Potential of Industrial Motor Systems

    E-Print Network [OSTI]

    McKane, Aimee

    2014-01-01

    2003. Energy-efficient motor systems in the industrial andpotential for energy efficiency in industrial motor systemspotential for energy efficiency in industrial motor systems

  17. Security bounds for efficient decoy-state quantum key distribution

    E-Print Network [OSTI]

    Marco Lucamarini; James F. Dynes; Bernd Fröhlich; Zhiliang Yuan; Andrew J. Shields

    2015-03-25

    Information-theoretical security of quantum key distribution (QKD) has been convincingly proven in recent years and remarkable experiments have shown the potential of QKD for real world applications. Due to its unique capability of combining high key rate and security in a realistic finite-size scenario, the efficient version of the BB84 QKD protocol endowed with decoy states has been subject of intensive research. Its recent experimental implementation finally demonstrated a secure key rate beyond 1 Mbps over a 50 km optical fiber. However the achieved rate holds under the restrictive assumption that the eavesdropper performs collective attacks. Here, we review the protocol and generalize its security. We exploit a map by Ahrens to rigorously upper bound the Hypergeometric distribution resulting from a general eavesdropping. Despite the extended applicability of the new protocol, its key rate is only marginally smaller than its predecessor in all cases of practical interest.

  18. Distributed fiber optic moisture intrusion sensing system

    DOE Patents [OSTI]

    Weiss, Jonathan D. (Albuquerque, NM)

    2003-06-24

    Method and system for monitoring and identifying moisture intrusion in soil such as is contained in landfills housing radioactive and/or hazardous waste. The invention utilizes the principle that moist or wet soil has a higher thermal conductance than dry soil. The invention employs optical time delay reflectometry in connection with a distributed temperature sensing system together with heating means in order to identify discrete areas within a volume of soil wherein temperature is lower. According to the invention an optical element and, optionally, a heating element may be included in a cable or other similar structure and arranged in a serpentine fashion within a volume of soil to achieve efficient temperature detection across a large area or three dimensional volume of soil. Remediation, moisture countermeasures, or other responsive action may then be coordinated based on the assumption that cooler regions within a soil volume may signal moisture intrusion where those regions are located.

  19. Efficient Distributed Monitoring in 6LoWPAN Abdelkader Lahmadi

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    troubleshooting, forensics, performance management. The main challenge for the monitoring plane in these networks combined with strong energy preservation. Monitoring, i.e the process of measuring sampled properties. Such design requirements can be met by self-organizing and distributed monitoring systems. In the literature

  20. Distributed vs. Centralized Power Systems Frequency Control

    E-Print Network [OSTI]

    Dimarogonas, Dimos

    Distributed vs. Centralized Power Systems Frequency Control Martin Andreasson12 , Dimos V control of electrical power systems. We propose a distributed controller which retains the reference, where their performance is compared. I. INTRODUCTION Distributed control is in many large-scale systems

  1. Webinar: Highly Efficient Solar Thermochemical Reaction Systems

    Broader source: Energy.gov [DOE]

    The Fuel Cell Technologies Office will present a live webinar titled "Highly Efficient Solar Thermochemical Reaction Systems" on Tuesday, January 13, from 12:00 to 1:00 p.m. Eastern Standard Time.

  2. Highly Efficient Solar Thermochemical Reaction Systems

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Highly Efficient, Solar Thermochemical Reaction Systems (2014 R&D 100 Award Winner) U.S. Department of Energy Fuel Cell Technologies Office 2 Question and Answer * Please type your...

  3. Distributed Energy Systems Integration Group (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2009-10-01

    Factsheet developed to describe the activites of the Distributed Energy Systems Integration Group within NREL's Electricity, Resources, and Buildings Systems Integration center.

  4. DOE Zero Energy Ready Home Efficient Hot Water Distribution I-- What's At Stake Webinar (Text Version)

    Broader source: Energy.gov [DOE]

    Below is the text version of the webinar, Efficient Hot Water Distribution I -- What's At Stake, presented in January 2014.

  5. Efficient Power System State Estimation

    E-Print Network [OSTI]

    Lavaei, Javad

    failure or generator outages. In the normal insecure state, a system may not be able to handle to be normal, when in reality it is not. Then the employees at the control center would not be able to act preemptively to alleviate any situations on the ground. They might find out too late, when there are already

  6. Heat Distribution Systems | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    Forced-air systems use ducts that can also be used for central air conditioning and heat pump systems. Radiant heating systems also have unique heat distribution systems. That...

  7. Energy efficiency improvements in Chinese compressed air systems

    E-Print Network [OSTI]

    McKane, Aimee; Li, Li; Li, Yuqi; Taranto, T.

    2008-01-01

    Air Systems, Paper #071 Energy efficiency improvements into increase industrial energy efficiency. As a result, morein use. Over time, energy efficiency decreases and the cost

  8. Efficient and Secure Storage Systems Based on Peer-to-Peer Systems Yongge Wang, Yuliang Zheng, and Beitseng Chu

    E-Print Network [OSTI]

    Wang, Yongge

    Efficient and Secure Storage Systems Based on Peer-to-Peer Systems Yongge Wang, Yuliang Zheng Distributed storage service requirements Networked storage systems make distributed storage services simple storage systems are relatively difficult to imple- ment. Only after these problems are solved

  9. The Clouds Distributed Operating System * Partha Dasgupta

    E-Print Network [OSTI]

    Yeom, Heon Young

    The Clouds Distributed Operating System * Partha Dasgupta Dept. of Computer Science and Engg Ramachandran. College of Computing Georgia Tech, Atlanta, GA 30332 Keywords: Distributed Operating Systems operating system that runs on general purpose computers connected via a local­area network. The system

  10. Efficient Pairings and ECC for Embedded Systems

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Efficient Pairings and ECC for Embedded Systems Thomas Unterluggauer and Erich Wenger Graz-based cryptography brought forth a wide range of protocols interesting for future embedded applications. One curve and its reusability for other elliptic-curve based crypto systems offer a great solution for every

  11. Efficient implementation of a multidimensional fast fourier transform on a distributed-memory parallel multi-node computer

    DOE Patents [OSTI]

    Bhanot, Gyan V. (Princeton, NJ); Chen, Dong (Croton-On-Hudson, NY); Gara, Alan G. (Mount Kisco, NY); Giampapa, Mark E. (Irvington, NY); Heidelberger, Philip (Cortlandt Manor, NY); Steinmacher-Burow, Burkhard D. (Mount Kisco, NY); Vranas, Pavlos M. (Bedford Hills, NY)

    2008-01-01

    The present in invention is directed to a method, system and program storage device for efficiently implementing a multidimensional Fast Fourier Transform (FFT) of a multidimensional array comprising a plurality of elements initially distributed in a multi-node computer system comprising a plurality of nodes in communication over a network, comprising: distributing the plurality of elements of the array in a first dimension across the plurality of nodes of the computer system over the network to facilitate a first one-dimensional FFT; performing the first one-dimensional FFT on the elements of the array distributed at each node in the first dimension; re-distributing the one-dimensional FFT-transformed elements at each node in a second dimension via "all-to-all" distribution in random order across other nodes of the computer system over the network; and performing a second one-dimensional FFT on elements of the array re-distributed at each node in the second dimension, wherein the random order facilitates efficient utilization of the network thereby efficiently implementing the multidimensional FFT. The "all-to-all" re-distribution of array elements is further efficiently implemented in applications other than the multidimensional FFT on the distributed-memory parallel supercomputer.

  12. Efficient implementation of multidimensional fast fourier transform on a distributed-memory parallel multi-node computer

    DOE Patents [OSTI]

    Bhanot, Gyan V. (Princeton, NJ); Chen, Dong (Croton-On-Hudson, NY); Gara, Alan G. (Mount Kisco, NY); Giampapa, Mark E. (Irvington, NY); Heidelberger, Philip (Cortlandt Manor, NY); Steinmacher-Burow, Burkhard D. (Mount Kisco, NY); Vranas, Pavlos M. (Bedford Hills, NY)

    2012-01-10

    The present in invention is directed to a method, system and program storage device for efficiently implementing a multidimensional Fast Fourier Transform (FFT) of a multidimensional array comprising a plurality of elements initially distributed in a multi-node computer system comprising a plurality of nodes in communication over a network, comprising: distributing the plurality of elements of the array in a first dimension across the plurality of nodes of the computer system over the network to facilitate a first one-dimensional FFT; performing the first one-dimensional FFT on the elements of the array distributed at each node in the first dimension; re-distributing the one-dimensional FFT-transformed elements at each node in a second dimension via "all-to-all" distribution in random order across other nodes of the computer system over the network; and performing a second one-dimensional FFT on elements of the array re-distributed at each node in the second dimension, wherein the random order facilitates efficient utilization of the network thereby efficiently implementing the multidimensional FFT. The "all-to-all" re-distribution of array elements is further efficiently implemented in applications other than the multidimensional FFT on the distributed-memory parallel supercomputer.

  13. IBM and Energy Efficiency: Energy Managemnt Systems 

    E-Print Network [OSTI]

    Veilleux, Y.

    2013-01-01

    Corporation IBM and Energy Efficiency Improving the environment and supporting our competitiveness October, 2013 Yves Veilleux Manager Energy and Environmental programs ICEBO 2013 ? 2013 IBM Corporation Overview ? IBM energy program, an ISO 50001... 1. Calculation of energy flows 2. Requires substantial energy metering 3. Efficient use of cost centers Enterprise Energy Monitoring System (EEMS) Measures Application 1 General Accounting 1. Basic site energy metering 2. Development...

  14. Automatic Software Upgrades for Distributed Systems

    E-Print Network [OSTI]

    Ajmani, Sameer

    2005-11-30

    Upgrading the software of long-lived, highly-available distributed systems is difficult. It is not possible to upgrade all the nodes in a system at once, since some nodes may be unavailable and halting the system for an ...

  15. Best Management Practice #3: Distribution System Audits, Leak...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    3: Distribution System Audits, Leak Detection, and Repair Best Management Practice 3: Distribution System Audits, Leak Detection, and Repair A distribution system audit, leak...

  16. Low jitter RF distribution system

    DOE Patents [OSTI]

    Wilcox, Russell; Doolittle, Lawrence; Huang, Gang

    2012-09-18

    A timing signal distribution system includes an optical frequency stabilized laser signal amplitude modulated at an rf frequency. A transmitter box transmits a first portion of the laser signal and receive a modified optical signal, and outputs a second portion of the laser signal and a portion of the modified optical signal. A first optical fiber carries the first laser signal portion and the modified optical signal, and a second optical fiber carries the second portion of the laser signal and the returned modified optical signal. A receiver box receives the first laser signal portion, shifts the frequency of the first laser signal portion outputs the modified optical signal, and outputs an electrical signal on the basis of the laser signal. A detector at the end of the second optical fiber outputs a signal based on the modified optical signal. An optical delay sensing circuit outputs a data signal based on the detected modified optical signal. An rf phase detect and correct signal circuit outputs a signal corresponding to a phase stabilized rf signal based on the data signal and the frequency received from the receiver box.

  17. Integrated Solar Thermochemical Reaction System for High Efficiency...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Integrated Solar Thermochemical Reaction System for High Efficiency Production of Electricity Integrated Solar Thermochemical Reaction System for High Efficiency Production of...

  18. Ultra Efficient Combined Heat, Hydrogen, and Power System - Presentati...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Ultra Efficient Combined Heat, Hydrogen, and Power System - Presentation by FuelCell Energy, June 2011 Ultra Efficient Combined Heat, Hydrogen, and Power System - Presentation by...

  19. Lean Gasoline System Development for Fuel Efficient Small Car...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    More Documents & Publications Lean Gasoline System Development for Fuel Efficient Small Car Lean Gasoline System Development for Fuel Efficient Small Car Vehicle Technologies...

  20. Advanced Systems of Efficient Use of Electrical Energy SURE ...

    Open Energy Info (EERE)

    Advanced Systems of Efficient Use of Electrical Energy SURE (Smart Grid Project) Jump to: navigation, search Project Name Advanced Systems of Efficient Use of Electrical Energy...

  1. Development of a High-Efficiency Zonal Thermoelectric HVAC System...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    a High-Efficiency Zonal Thermoelectric HVAC System for Automotive Applications Development of a High-Efficiency Zonal Thermoelectric HVAC System for Automotive Applications...

  2. Improving efficiency of a vehicle HVAC system with comfort modeling...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    efficiency of a vehicle HVAC system with comfort modeling, zonal design, and thermoelectric devices Improving efficiency of a vehicle HVAC system with comfort modeling, zonal...

  3. The Application and Verification of ASHRAE 152-2004 (Method of Test for Determining the Design and Seasonal Efficiencies of Residential Thermal Distribution Systems) to DOE-2-1e Simulation Program 

    E-Print Network [OSTI]

    Kim, S.; Haberl, J. S.

    2008-01-01

    A&M University System 6 The heating, ventilation and air-conditioning system consists of a 10.5 SEER (Seasonal Energy Efficiency Ratio) air-conditioning unit (2.5 tons), a furnace with 80% AFUE (Annual Fuel Utilization Efficiency), and a 0.... This caused the CV(RMSE) and MBE for the attic temperature to be reduced from 14.5 % to 8.0 % and 6.9 % to 2.0 %. These results showed that using layered materials with DOE-2?s custom weighting factors predicted more accurately than using overall U...

  4. WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF

    E-Print Network [OSTI]

    Mays, Larry W.

    CHAPTER 5 WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF SIMULATED ANNEALING Fred E. Goldman Arizona State University, Tempe, Arizona 5.1 INTRODUCTION The operation of water distribution systems affects the water quality in these systems. EPA regulations require that water quality be maintained

  5. Industrial Compressed Air System Energy Efficiency Guidebook.

    SciTech Connect (OSTI)

    United States. Bonneville Power Administration.

    1993-12-01

    Energy efficient design, operation and maintenance of compressed air systems in industrial plants can provide substantial reductions in electric power and other operational costs. This guidebook will help identify cost effective, energy efficiency opportunities in compressed air system design, re-design, operation and maintenance. The guidebook provides: (1) a broad overview of industrial compressed air systems, (2) methods for estimating compressed air consumption and projected air savings, (3) a description of applicable, generic energy conservation measures, and, (4) a review of some compressed air system demonstration projects that have taken place over the last two years. The primary audience for this guidebook includes plant maintenance supervisors, plant engineers, plant managers and others interested in energy management of industrial compressed air systems.

  6. Building a Smarter Distribution System in Pennsylvania

    Office of Environmental Management (EM)

    Study - PPL Electric Utilities Corporation Smart Grid Investment Grant 1 Building a Smarter Distribution System in Pennsylvania PPL Electric Utilities Corporation (PPL) provides...

  7. Improving Industrial Refrigeration System Efficiency - Actual Applications 

    E-Print Network [OSTI]

    White, T. L.

    1980-01-01

    in the booster pump suction line to prevent pump cavitation and to improve refrigeration cycle effi ciency. Por each lOOp of sUDcooling, cycle efficiency increases by about 2%. Approxi mately 20 0 p of subcooling is planned for the modified system...

  8. Solar ADEPT: Efficient Solar Energy Systems

    SciTech Connect (OSTI)

    2011-01-01

    Solar ADEPT Project: The 7 projects that make up ARPA-E's Solar ADEPT program, short for 'Solar Agile Delivery of Electrical Power Technology,' aim to improve the performance of photovoltaic (PV) solar energy systems, which convert the sun's rays into electricity. Solar ADEPT projects are integrating advanced electrical components into PV systems to make the process of converting solar energy to electricity more efficient.

  9. Lighting system with heat distribution face plate

    DOE Patents [OSTI]

    Arik, Mehmet; Weaver, Stanton Earl; Stecher, Thomas Elliot; Kuenzler, Glenn Howard; Wolfe, Jr., Charles Franklin; Li, Ri

    2013-09-10

    Lighting systems having a light source and a thermal management system are provided. The thermal management system includes synthetic jet devices, a heat sink and a heat distribution face plate. The synthetic jet devices are arranged in parallel to one and other and are configured to actively cool the lighting system. The heat distribution face plate is configured to radially transfer heat from the light source into the ambient air.

  10. Hybrid solar lighting distribution systems and components

    DOE Patents [OSTI]

    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)

    2011-07-05

    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.

  11. Picking up the PACE : a new tool for financing energy efficiency and distributed renewable energy

    E-Print Network [OSTI]

    Dadakis, Jacquelyn (Jacquelyn MacKenzie)

    2010-01-01

    This thesis describes the potential of new legislation in Louisiana to provide municipal financing for energy efficient building retrofits and distributed renewable energy. First, the thesis identifies how energy efficiency ...

  12. Ultra Efficient Combined Heat, Hydrogen, and Power System- Presentation by FuelCell Energy, June 2011

    Broader source: Energy.gov [DOE]

    Presentation on Ultra Efficient Combined Heat, Hydrogen, and Power System, given by Pinakin Patel at the U.S. DOE Industrial Distributed Energy Portfolio Review Meeting in Washington, D.C. on June 1-2, 2011.

  13. World Class Boilers and Steam Distribution System 

    E-Print Network [OSTI]

    Portell, V. P.

    2002-01-01

    the relevant industrial profile. Some companies may question why they should upgrade their system. The most obvious answer will be found in the benefits that derive from more efficient operations. Costs are reduced, reliability is improved, and adverse...

  14. Enabling Automated and Efficient Personalization Systems

    E-Print Network [OSTI]

    Verma, Chetan Kumar

    2015-01-01

    80 3.4.4 Efficient Classification1.2.3 Improving time efficiency of personalizedmore effectively and efficiently. The third key contribution

  15. Assessing the Energy Efficiency Potential of Industrial Motor Systems

    E-Print Network [OSTI]

    McKane, Aimee

    2014-01-01

    Stavins, R. N. , 1994. The energy-efficiency gap: What doesit mean? Energy PolicyP. ; Bertoldi, P. , 2003. Energy-efficient motor systems in

  16. Avoiding Distribution System Upgrade Costs Using Distributed Generation

    SciTech Connect (OSTI)

    Schienbein, Lawrence A.; Balducci, Patrick J.; Nguyen, Tony B.; Brown, Daryl R.; DeSteese, John G.; Speer, Gregory A.

    2004-01-20

    PNNL, in cooperation with three utilities, developed a database and methodology to analyze and characterize the avoided costs of Distributed Generation (DG) deployment as an alternative to traditional distribution system investment. After applying a number of screening criteria to the initial set of 307 cases, eighteen were selected for detailed analysis. Alternative DG investment scenarios were developed for these cases to permit capital, operation, maintenance, and fuel costs to be identified and incorporated into the analysis. The “customer-owned” backup power generator option was also investigated. The results of the analysis of the 18 cases show that none yielded cost savings under the alternative DG scenarios. However, the DG alternative systems were configured using very restrictive assumptions concerning reliability, peak rating, engine types and acceptable fuel. In particular it was assumed that the DG alternative in each case must meet the reliability required of conventional distribution systems (99.91% reliability). The analysis was further constrained by a requirement that each substation meet the demands placed upon it by a one in three weather occurrence. To determine if, by relaxing these requirements, the DG alternative might be more viable, one project was re-examined. The 99.91% reliability factor was still assumed for normal operating conditions but redundancy required to maintain reliability was relaxed for the relatively few hours every three years where extreme weather caused load to exceed present substation capacity. This resulted in the deferment of capital investment until later years and reduced the number of engines required for the project. The cost of both the conventional and DG alternative also dropped because the centralized power generation, variable O&M, and DG fuels costs were calculated based on present load requirements in combination with long-term forecasts of load growth, as opposed to load requirements plus a buffer based on predictions of extraordinary weather conditions. Application of the relaxed set of assumptions reduced the total cost of the DG alternative by roughly 57 percent from $7.0 million to $3.0 million. The reduction, however, did not change the overall result of the analysis, as the cost of the conventional distribution system upgrade alternative remained lower at $1.7 million. This paper also explores the feasibility of using a system of backup generators to defer investment in distribution system infrastructure. Rather than expanding substation capacity at substations experiencing slow load growth rates, PNNL considered a scenario where diesel generators were installed on location at customers participating in a program designed to offer additional power security and reliability to the customer and connection to the grid. The backup generators, in turn, could be used to meet peak demand for a limited number of hours each year, thus deferring distribution system investment. Data from an existing program at one of the three participating utilities was used to quantify the costs associated with the backup generator scenario. The results of the “customer owned” backup power generator analysis showed that in all cases the nominal cost of the DG scenario is more than the nominal cost of the base-case conventional distribution system upgrade scenario. However, in two of the cases the total present value costs of the alternative backup generator scenarios were between 15 and 22% less than those for the conventional scenarios. Overall, the results of the study offer considerable encouragement that the use of DG systems can defer conventional distribution system upgrades under the right conditions and when the DG configurations are intelligently designed. Using existing customer-owned DG to defer distribution system upgrades appears to be an immediate commercially-viable opportunity.

  17. Distributed Energy System Validation, Commissioning and

    E-Print Network [OSTI]

    Distributed Energy System Validation, Commissioning and Qualification Test Report Prepared Agreement No. DE-FC26-06NT42847 Hawai`i Distributed Energy Resource Technologies for Energy Security Subtask for the U.S. Department of Energy Office of Electricity Delivery and Energy Reliability Under Cooperative

  18. Integrated Systems Plus Principles Approach to Industrial Energy Efficiency

    E-Print Network [OSTI]

    Kissock, Kelly

    Integrated Systems Plus Principles Approach to Industrial Energy Efficiency Tim Raffio, Hang Zhang the environmental impacts of energy use drive improvements in manufacturing energy efficiency. This paper presents a systematic approach for improving industrial energy efficiency that breaks complicated manufacturing

  19. Virtualizing Operating Systems for Seamless Distributed Environments

    E-Print Network [OSTI]

    Dasgupta, Partha

    Virtualizing Operating Systems for Seamless Distributed Environments 1 Tom Boyd and Partha Dasgupta. Abstract Applications and operating systems can be augmented with extra functionality by injecting bindings. This is called virtualiza- tion. We are developing a virtualizing Operating System (vOS) residing

  20. A DISTRIBUTED AUTOMATION SYSTEM FOR ELECTROPHYSICAL INSTALLATIONS

    E-Print Network [OSTI]

    Kozak, Victor R.

    A DISTRIBUTED AUTOMATION SYSTEM FOR ELECTROPHYSICAL INSTALLATIONS V.R. Kozak Budker Institute There was designed a set of devices for automation systems of physical installations. On this basis approach. KEY WORDS Automation, systems, applications, CANBUS, embedded, controller. 1. Introduction Budker

  1. Convex Models of Distribution System Reconfiguration

    E-Print Network [OSTI]

    Taylor, Joshua A.

    We derive new mixed-integer quadratic, quadratically constrained, and second-order cone programming models of distribution system reconfiguration, which are to date the first formulations of the ac problem that have convex, ...

  2. Incorporating solid state drives into distributed storage systems

    E-Print Network [OSTI]

    Wacha, Rosie

    2012-01-01

    27 Low Power Storage Systems . . . . . . . . . . . . . . .Drives into Distributed Storage Systems Rosie Wacha Big dataINTO DISTRIBUTED STORAGE SYSTEMS A dissertation submitted in

  3. PhD Recent Graduates with background in Distributed Systems. Virtualization, Distributed Systems, Application Servers or Operating Systems

    E-Print Network [OSTI]

    Plotkin, Joshua B.

    and maintenance support of the project. * Work closely with internal SAP associates, external partnersPhD Recent Graduates with background in Distributed Systems. Virtualization, Distributed Systems, Application Servers or Operating Systems Global Business Incubator Location ­ Palo Alto PURPOSE

  4. Staying FIT: Efficient Load Shedding Techniques for Distributed Stream Processing

    E-Print Network [OSTI]

    . Bottlenecks slow down processing and network transmission, and cause delayed outputs. Load management has been. Common load management techniques include adaptive load distribution, admis- sion control, and load

  5. A reliability assessment methodology for distribution systems with distributed generation 

    E-Print Network [OSTI]

    Duttagupta, Suchismita Sujaya

    2006-08-16

    is associated 11 Fig. 1. Sample Distribution Network with the network response to dynamic and transient failures caused from faults and other disturbances, which could result in widespread cascading outages and loss of stability [11]. This research will focus... and maintain reliable power systems because cost of interruptions and power outages can have severe economic impact on the utility and its customers. At present, the deregulated electric power utilities are being restructured and operated as distinct generation...

  6. Switching coordination of distributed dc-dc converters for highly efficient photovoltaic power plants

    DOE Patents [OSTI]

    Agamy, Mohammed; Elasser, Ahmed; Sabate, Juan Antonio; Galbraith, Anthony William; Harfman Todorovic, Maja

    2014-09-09

    A distributed photovoltaic (PV) power plant includes a plurality of distributed dc-dc converters. The dc-dc converters are configured to switch in coordination with one another such that at least one dc-dc converter transfers power to a common dc-bus based upon the total system power available from one or more corresponding strings of PV modules. Due to the coordinated switching of the dc-dc converters, each dc-dc converter transferring power to the common dc-bus continues to operate within its optimal efficiency range as well as to optimize the maximum power point tracking in order to increase the energy yield of the PV power plant.

  7. Comparison of energy efficiency between variable refrigerant flow systems and ground source heat pump systems

    E-Print Network [OSTI]

    Hong, Tainzhen

    2010-01-01

    Comparison of energy efficiency between variable refrigeranttheir superior energy efficiency. The variable refrigerantfew studies reporting the energy efficiency of VRF systems

  8. Efficient, Portable, and Robust Extension of Operating System Functionality

    E-Print Network [OSTI]

    Newhall, Tia

    Efficient, Portable, and Robust Extension of Operating System Functionality Amin Vahdat, Douglas, operating systems are not chosen for underlying system features, but rather for the performance of the underlying hardware, available application programs, and system stability. Consequently, operating system

  9. Design and Implementation of Ceph: A Scalable Distributed File System

    SciTech Connect (OSTI)

    Weil, S A; Brandt, S A; Miller, E L; Long, D E; Maltzahn, C

    2006-04-19

    File system designers continue to look to new architectures to improve scalability. Object-based storage diverges from server-based (e.g. NFS) and SAN-based storage systems by coupling processors and memory with disk drives, delegating low-level allocation to object storage devices (OSDs) and decoupling I/O (read/write) from metadata (file open/close) operations. Even recent object-based systems inherit decades-old architectural choices going back to early UNIX file systems, however, limiting their ability to effectively scale to hundreds of petabytes. We present Ceph, a distributed file system that provides excellent performance and reliability with unprecedented scalability. Ceph maximizes the separation between data and metadata management by replacing allocation tables with a pseudo-random data distribution function (CRUSH) designed for heterogeneous and dynamic clusters of unreliable OSDs. We leverage OSD intelligence to distribute data replication, failure detection and recovery with semi-autonomous OSDs running a specialized local object storage file system (EBOFS). Finally, Ceph is built around a dynamic distributed metadata management cluster that provides extremely efficient metadata management that seamlessly adapts to a wide range of general purpose and scientific computing file system workloads. We present performance measurements under a variety of workloads that show superior I/O performance and scalable metadata management (more than a quarter million metadata ops/sec).

  10. Improving Energy Efficiency by Developing Components for Distributed Cooling and Heating Based on Thermal Comfort Modeling

    Office of Energy Efficiency and Renewable Energy (EERE)

    Discusses comfort model enhancement/validation, climate system efficiency parameters and system trade off, and powertrain mode operation changes to further vehicle energy saving while preserving occupant comfort.

  11. Investment and Efficiency under Incentive Regulation: The Case of the Norwegian Electricity Distribution Networks

    E-Print Network [OSTI]

    Poudineh, Rahmatallah; Jamasb, Tooraj

    2013-04-01

    and competitive businesses (NVE, 2010). EPRG 1306 4 At the early years of the reform, there were approximately 230 distribution networks and 70 generation units in Norway. The high number of utilities reflects the dispersed nature of hydroelectric resources... from their efficiency level. The investment increase can be continued until efficiency after investment reduces to no impact efficiency, in which state, some form of optimality will be achieved. On the other hand, those firms that their efficiency...

  12. DOE Zero Energy Ready Home Efficient Hot Water Distribution II...

    Broader source: Energy.gov (indexed) [DOE]

    with the Challenge Home program and here to set this up for you. Today's session on hot water distribution is one of a continuing series of tech training webinars to support our...

  13. An Electricity Trade Model for Multiple Power Distribution Networks in Smart Energy Systems

    E-Print Network [OSTI]

    Pedram, Massoud

    of the presented solutions. I. INTRODUCTION Energy efficiency optimization has drawn significant attention], [2]. Smart energy systems are thus introduced which aim at increasing the efficiency of both energy generation and distribution. The state-of-the-art smart energy systems, including resource allocation

  14. Improving Energy Efficiency for Energy Harvesting Embedded Systems*

    E-Print Network [OSTI]

    Qiu, Qinru

    Improving Energy Efficiency for Energy Harvesting Embedded Systems* Yang Ge, Yukan Zhang and Qinru efficient energy storage. Hybrid Electrical Energy Storage (HEES) system is proposed recently as a cost improving the energy efficiency and reducing the energy loss during the transfer process. The HEES system

  15. Energy Efficient Prefetching with Buffer Disks for Cluster File Systems

    E-Print Network [OSTI]

    Qin, Xiao

    Energy Efficient Prefetching with Buffer Disks for Cluster File Systems Adam Manzanares, Xiaojun the energy- efficiency of large scale parallel storage systems. To address these issues we introduce EEVFS (Energy Efficient Virtual File System), which is able to manage data placement and disk states to help

  16. Energy optimization of water distribution system

    SciTech Connect (OSTI)

    Not Available

    1993-02-01

    In order to analyze pump operating scenarios for the system with the computer model, information on existing pumping equipment and the distribution system was collected. The information includes the following: component description and design criteria for line booster stations, booster stations with reservoirs, and high lift pumps at the water treatment plants; daily operations data for 1988; annual reports from fiscal year 1987/1988 to fiscal year 1991/1992; and a 1985 calibrated KYPIPE computer model of DWSD`s water distribution system which included input data for the maximum hour and average day demands on the system for that year. This information has been used to produce the inventory database of the system and will be used to develop the computer program to analyze the system.

  17. Optimization of Chilled Water Flow and Its Distribution in Central Cooling System 

    E-Print Network [OSTI]

    Maheshwari, G. P.; Hajiah, A. E.; ElSherbini, A. I.

    2007-01-01

    This paper analyzes the impact of chilled water flow and its distribution on energy efficiency and comfort quality, using the results of a field study conducted for a central cooling production system during 2006 in Kuwait. The paper identifies...

  18. Advanced, Energy-Efficient Hybrid Membrane System for Industrial...

    Broader source: Energy.gov (indexed) [DOE]

    Advanced, Energy- Efficient Hybrid Membrane System for Industrial Water Reuse New Hybrid Membrane System Utilizes Industrial Waste Heat to Power Water Purification Process As...

  19. Distributed and Efficient Classifiers for Wireless Audio-Sensor Networks

    E-Print Network [OSTI]

    Nascimento, Mario A.

    - tion, Data Fusion, Decision Fusion. I. INTRODUCTION Vehicle tracking on acoustic data is based. These measurements can then be exploited in a number of ways. Two popular approaches, [2], are data fusion (DAF) and decision fusion (DEF). Implementing decision or data fusion requires sensors to collaborate efficiently

  20. Evaluating Domestic Hot Water Distribution System Options with Validated Analysis Models

    SciTech Connect (OSTI)

    Weitzel, E.; Hoeschele, E.

    2014-09-01

    A developing body of work is forming that collects data on domestic hot water consumption, water use behaviors, and energy efficiency of various distribution systems. Transient System Simulation Tool (TRNSYS) is a full distribution system developed that has been validated using field monitoring data and then exercised in a number of climates to understand climate impact on performance. In this study, the Building America team built upon previous analysis modeling work to evaluate differing distribution systems and the sensitivities of water heating energy and water use efficiency to variations of climate, load, distribution type, insulation and compact plumbing practices. Overall, 124 different TRNSYS models were simulated. The results of this work are useful in informing future development of water heating best practices guides as well as more accurate (and simulation time efficient) distribution models for annual whole house simulation programs.

  1. Pressure Regain Strategies for Existing Air Distribution Systems

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Pressure Regain Strategies for Existing Air Distribution Systems Arlan Burdick IBACOS, Inc. Pressure Regain Strategies for Existing Air Distribution Systems Problem Statement...

  2. Pressure Regain Strategies for Existing Air Distribution Systems...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Pressure Regain Strategies for Existing Air Distribution Systems Pressure Regain Strategies for Existing Air Distribution Systems This presentation was delivered at the U.S....

  3. Integration of HVAC System Design with Simplified Duct Distribution...

    Energy Savers [EERE]

    Integration of HVAC System Design with Simplified Duct Distribution - Building America Top Innovation Integration of HVAC System Design with Simplified Duct Distribution - Building...

  4. LVT: A Layered Verification Technique for Distributed Computing Systems

    E-Print Network [OSTI]

    Olsson, Ron

    LVT: A Layered Verification Technique for Distributed Computing Systems Cui Zhang ? , Brian R of distributed computing systems with multiple component layers. Each lower layer in such a system provides languages as interfaces of systems, LVT treats each layer in a distributed computing system as a distributed

  5. Improving Energy Efficiency and Security for Disk Systems

    E-Print Network [OSTI]

    Qin, Xiao

    Improving Energy Efficiency and Security for Disk Systems Shu Yin1 , Mohammed I. Alghamdi2 been focused on data security and energy efficiency, most of the existing approaches have concentrated optimization with security services to enhance the security of energy-efficient large- scale storage systems

  6. Customer System Efficiency Improvement Assessment: Description and examination of system characterization data

    SciTech Connect (OSTI)

    Callaway, J.W.; DeSteese, J.G.

    1986-12-01

    This report describes three data bases that were developed in the Customer System Efficiency Improvement (CSEI) Assessment project to help characterize transmission and distribution (T and D) system losses experienced by utility customers in the Pacific Northwest. A principal objective of this project is to assess the potential for electric energy conservation in the T and D systems of BPA's utility customers. The three data bases provide essential input on the number and operating characteristics of T and D component stocks that was used in another task of the CSEI Project to estimate the conservation supply functions that result from replacing existing stocks with more efficient components (Tepel et al. 1986). This document describes the three data bases, provides a guide to their use, and presents a summary characterization of the principal loss-generating components (lines and transformers) of the region's T and D systems.

  7. Commercial thermal distribution systems, Final report for CIEE/CEC

    SciTech Connect (OSTI)

    Xu, Tengfang; Bechu, Olivier; Carrie, Remi; Dickerhoff, Darryl; Fisk, William; Franconi, Ellen; Kristiansen, Oyvind; Levinson, Ronnen; McWilliams, Jennifer; Wang, Duo; Modera, Mark; Webster, Tom; Ring, Erik; Zhang, Qiang; Huizenga, Charlie; Bauman, Fred; Arens, Ed

    1999-12-01

    According to the California Energy Commission (CEC 1998a), California commercial buildings account for 35% of statewide electricity consumption, and 16% of statewide gas consumption. Space conditioning accounts for roughly 16,000 GWh of electricity and 800 million therms of natural gas annually, and the vast majority of this space conditioning energy passes through thermal distribution systems in these buildings. In addition, 8600 GWh per year is consumed by fans and pumps in commercial buildings, most of which is used to move the thermal energy through these systems. Research work at Lawrence Berkeley National Laboratory (LBNL) has been ongoing over the past five years to investigate the energy efficiency of these thermal distribution systems, and to explore possibilities for improving that energy efficiency. Based upon that work, annual savings estimates of 1 kWh/ft{sup 2} for light commercial buildings, and 1-2 kWh/ft{sup 2} in large commercial buildings have been developed for the particular aspects of thermal distribution system performance being addressed by this project. Those savings estimates, combined with a distribution of the building stock based upon an extensive stock characterization study (Modera et al. 1999a), and technical penetration estimates, translate into statewide saving potentials of 2000 GWh/year and 75 million thermal/year, as well as an electricity peak reduction potential of 0.7 GW. The overall goal of this research program is to provide new technology and application knowledge that will allow the design, construction, and energy services industries to reduce the energy waste associated with thermal distribution systems in California commercial buildings. The specific goals of the LBNL efforts over the past year were: (1) to advance the state of knowledge about system performance and energy losses in commercial-building thermal distribution systems; (2) to evaluate the potential of reducing thermal losses through duct sealing, duct insulation, and improved equipment sizing; and (3) to develop and evaluate innovative techniques applicable to large buildings for sealing ducts and encapsulating internal duct insulation. In the UCB fan project, the goals were: (1) to develop a protocol for testing, analyzing and diagnosing problems in large commercial building built-up air handling systems, and (2) to develop low-cost measurement techniques to improve short term monitoring practices. To meet our stated goals and objectives, this project: (1) continued to investigate and characterize the performance of thermal distribution systems in commercial buildings; (2) performed energy analyses and evaluation for duct-performance improvements for both small and large commercial buildings; (3) developed aerosol injection technologies for both duct sealing and liner encapsulation in commercial buildings; and (4) designed energy-related diagnostic protocols based on short term measurement and used a benchmarking database to compare subject systems with other measured systems for certain performance metrics. This year's efforts consisted of the following distinct tasks: performing characterization measurements for five light commercial building systems and five large-commercial-building systems; analyzing the potential for including duct performance in California's Energy Efficiency Standards for Residential and Non-Residential Buildings (Title 24), including performing energy and equipment sizing analyses of air distribution systems using DOE 2.1E for non-residential buildings; conducting laboratory experiments, field experiments, and modeling of new aerosol injection technologies concepts for sealing and coating, including field testing aerosol-based sealing in two large commercial buildings; improving low-cost fan monitoring techniques measurements, and disseminating fan tools by working with energy practitioners directly where possible and publishing the results of this research and the tools developed on a web-site. The final report consists of five sections listed below. Each section includes its related

  8. Distributed Energy Management for Electric Power Systems

    E-Print Network [OSTI]

    Distributed Energy Management for Electric Power Systems Gabriela Hug, ghug@ece.cmu.edu Soummya Kar Theory Power flow control Consensus + Innovation Approach Theory Energy Management Conclusions 2 #12 line flows Tertiary Control => Energy Energy source scheduling including generator and storage

  9. Improving the Operating Efficiency of Microturbine-Based Distributed...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    microturbines can be packaged into multi-megawatt systems for larger project sizes. Both dual fuel capability and uninterruptible power supply (UPS) functionality can be added in...

  10. D-ADMM: A Communication-Efficient Distributed Algorithm For ...

    E-Print Network [OSTI]

    2012-02-13

    Complex Systems, 2006. [44] R Development Core Team, R: A Language and Environment for. Statistical Computing, R Foundation for Statistical Computing, ...

  11. An advanced power distribution automation model system

    SciTech Connect (OSTI)

    Niwa, Shigeharu; Kanoi, Minoru; Nishijima, Kazuo; Hayami, Mitsuo

    1995-12-31

    An advanced power distribution automation (APDA) model system has been developed on the present basis of the automated distribution systems in Japan, which have been used for remote switching operations and for urgent supply restorations during faults. The increased use of electronic apparatuses sensitive to supply interruption requires very high supply reliability, and the final developed system is expected to be useful for this purpose. The developed model system adopts pole circuit breakers and remote termination units connected through 64kbps optical fibers to the computer of the automated system in the control center. Immediate switching operations for supply restorations during faults are possible through the restoration procedures, prepared beforehand, by the computer and by fast telecommunications using optical fibers. So, protection by the feeder circuit breaker in the substation can be avoided, which would otherwise cause the blackout of the whole distribution line. The test results show the effectiveness of model the system: successful fault locations and reconfiguration for supply restoration including separation of the fault sections (without blackout for the ground faults and with a short period (within 1 s) of blackout for the short-circuit faults).

  12. Evaluating Domestic Hot Water Distribution System Options With Validated Analysis Models

    SciTech Connect (OSTI)

    Weitzel, E.; Hoeschele, M.

    2014-09-01

    A developing body of work is forming that collects data on domestic hot water consumption, water use behaviors, and energy efficiency of various distribution systems. A full distribution system developed in TRNSYS has been validated using field monitoring data and then exercised in a number of climates to understand climate impact on performance. This study builds upon previous analysis modelling work to evaluate differing distribution systems and the sensitivities of water heating energy and water use efficiency to variations of climate, load, distribution type, insulation and compact plumbing practices. Overall 124 different TRNSYS models were simulated. Of the configurations evaluated, distribution losses account for 13-29% of the total water heating energy use and water use efficiency ranges from 11-22%. The base case, an uninsulated trunk and branch system sees the most improvement in energy consumption by insulating and locating the water heater central to all fixtures. Demand recirculation systems are not projected to provide significant energy savings and in some cases increase energy consumption. Water use is most efficient with demand recirculation systems, followed by the insulated trunk and branch system with a central water heater. Compact plumbing practices and insulation have the most impact on energy consumption (2-6% for insulation and 3-4% per 10 gallons of enclosed volume reduced). The results of this work are useful in informing future development of water heating best practices guides as well as more accurate (and simulation time efficient) distribution models for annual whole house simulation programs.

  13. Systemic impediments to constructing energy-efficient commercial buildings

    E-Print Network [OSTI]

    Franklin, James G

    2015-01-01

    Exploring a systems-based view of the energy efficiency roadblocks faced by financiers, builders, owners, and tenants. In 1992 Amory Lovins, founder of the Rocky Mountain Institute, wrote a paper entitled "Energy-Efficient ...

  14. Energy-Efficient Distributed Constructions of Minimum Spanning Tree for Wireless Ad-hoc

    E-Print Network [OSTI]

    Khan, Maleq

    1 Energy-Efficient Distributed Constructions of Minimum Spanning Tree for Wireless Ad-hoc Networks and energy efficient for being practical. Motivated by these considerations, we study the performance of a class of simple and local algorithms called Nearest Neighbor Tree (NNT) algorithms for energy

  15. Efficient and Customizable Data Partitioning Framework for Distributed Big RDF Data Processing in the Cloud

    E-Print Network [OSTI]

    Liu, Ling

    Efficient and Customizable Data Partitioning Framework for Distributed Big RDF Data Processing}@gatech.edu Abstract--Big data business can leverage and benefit from the Clouds, the most optimized in processing big data in the Clouds is how to effectively partition the big data to ensure efficient

  16. Configurable and Adaptive Middleware for Energy-Efficient Distributed Mobile Computing

    E-Print Network [OSTI]

    Ryder, Barbara G.

    Configurable and Adaptive Middleware for Energy-Efficient Distributed Mobile Computing Young Department of Computer Science, Virginia Tech tilevich@cs.vt.edu Abstract. The energy demands of modern mobile devices are outstrip- ping their battery lives. As a result, energy efficiency--fitting an energy

  17. GDMN : An Information Management Network for Distributed Systems

    E-Print Network [OSTI]

    Sengupta, Raja

    GDMN : An Information Management Network for Distributed Systems Amit Mahajan {amahajan from the system. 1 Introduction There are many systems that produce and con- sume information at many sites distributed over large geographical areas. Battlefield networks, traffic management systems

  18. SOLID OXIDE FUEL CELL HYBRID SYSTEM FOR DISTRIBUTED POWER GENERATION

    SciTech Connect (OSTI)

    Kurt Montgomery; Nguyen Minh

    2003-08-01

    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.

  19. Comparison of energy efficiency between variable refrigerant flow systems and ground source heat pump systems

    E-Print Network [OSTI]

    Hong, Tainzhen

    2010-01-01

    GSHP system is more energy efficient than the air-source VRFGSHP system is more energy efficient than the air-source VRVintended to be as energy efficient as required by current

  20. IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 25, NO. 4, NOVEMBER 2010 1865 Impact of Energy Efficiency Incentives

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 25, NO. 4, NOVEMBER 2010 1865 Impact of Energy Efficiency the implementation of energy efficiency poli- cies on the power distribution sector. To assess the outcome different energy efficiency levels required by the regulator. The results reveal that the introduction

  1. An efficient algorithm for building a distributional thesaurus (and other Sketch Engine developments)

    E-Print Network [OSTI]

    Wicentowski, Richard

    An efficient algorithm for building a distributional thesaurus (and other Sketch Engine, thesauruses based on large corpora for (at time of writing) seven major world languages. The development histograms to present the distribution in a way that is easy to grasp. 1 Thesaurus creation Over the last ten

  2. Data reprocessing on worldwide distributed systems

    SciTech Connect (OSTI)

    Diesburg, Mike; Wicke, Daniel; /Fermilab

    2004-12-01

    The D0 experiment faces many challenges enabling access to large datasets for physicists on 4 continents. The strategy followed is to make use of worldwide distributed computing clusters. Since the begin of Tevatron Run-II (March 2001) all Monte-Carlo simulations are produced outside of Fermilab on remote systems. For analyses a system of regional analysis centres (RACs) was established which supply the associated institutes with the data. This structure which is similar to the Tier structure foreseen for LHC was used in autumn 2003 to reprocess all D0-data with the up-to-date and much improved reconstruction software. With these achievements D0 is the first high energy physics experiment to have implemented and operated all essential computing tasks on non-dedicated, worldwide distributed systems. The experiences gained in D0 can be applied to evaluate the LHC computing model.

  3. Data reprocessing on worldwide distributed systems

    SciTech Connect (OSTI)

    Wicke, Daniel; /Fermilab

    2004-12-01

    The D0 experiment faces many challenges in terms of enabling access to large datasets for physicists on four continents. The strategy for solving these problems on worldwide distributed computing clusters is presented. Since the beginning of Run II of the Tevatron (March 2001) all Monte-Carlo simulations for the experiment have been produced at remote systems. For data analysis, a system of regional analysis centers (RACs) was established which supply the associated institutes with the data. This structure, which is similar to the tiered structure foreseen for the LHC was used in Fall 2003 to reprocess all D0 data with a much improved version of the reconstruction software. This makes D0 the first running experiment that has implemented and operated all important computing tasks of a high energy physics experiment on systems distributed worldwide.

  4. Laser spark distribution and ignition system

    DOE Patents [OSTI]

    Woodruff, Steven (Morgantown, WV); McIntyre, Dustin L. (Morgantown, WV)

    2008-09-02

    A laser spark distribution and ignition system that reduces the high power optical requirements for use in a laser ignition and distribution system allowing for the use of optical fibers for delivering the low peak energy pumping pulses to a laser amplifier or laser oscillator. An optical distributor distributes and delivers optical pumping energy from an optical pumping source to multiple combustion chambers incorporating laser oscillators or laser amplifiers for inducing a laser spark within a combustion chamber. The optical distributor preferably includes a single rotating mirror or lens which deflects the optical pumping energy from the axis of rotation and into a plurality of distinct optical fibers each connected to a respective laser media or amplifier coupled to an associated combustion chamber. The laser spark generators preferably produce a high peak power laser spark, from a single low power pulse. The laser spark distribution and ignition system has application in natural gas fueled reciprocating engines, turbine combustors, explosives and laser induced breakdown spectroscopy diagnostic sensors.

  5. Distributed parallel messaging for multiprocessor systems

    DOE Patents [OSTI]

    Chen, Dong; Heidelberger, Philip; Salapura, Valentina; Senger, Robert M; Steinmacher-Burrow, Burhard; Sugawara, Yutaka

    2013-06-04

    A method and apparatus for distributed parallel messaging in a parallel computing system. The apparatus includes, at each node of a multiprocessor network, multiple injection messaging engine units and reception messaging engine units, each implementing a DMA engine and each supporting both multiple packet injection into and multiple reception from a network, in parallel. The reception side of the messaging unit (MU) includes a switch interface enabling writing of data of a packet received from the network to the memory system. The transmission side of the messaging unit, includes switch interface for reading from the memory system when injecting packets into the network.

  6. Performance Monitoring of Residential Hot Water Distribution Systems

    SciTech Connect (OSTI)

    Liao, Anna; Lanzisera, Steven; Lutz, Jim; Fitting, Christian; Kloss, Margarita; Stiles, Christopher

    2014-08-11

    Current water distribution systems are designed such that users need to run the water for some time to achieve the desired temperature, wasting energy and water in the process. We developed a wireless sensor network for large-scale, long time-series monitoring of residential water end use. Our system consists of flow meters connected to wireless motes transmitting data to a central manager mote, which in turn posts data to our server via the internet. This project also demonstrates a reliable and flexible data collection system that could be configured for various other forms of end use metering in buildings. The purpose of this study was to determine water and energy use and waste in hot water distribution systems in California residences. We installed meters at every end use point and the water heater in 20 homes and collected 1s flow and temperature data over an 8 month period. For a typical shower and dishwasher events, approximately half the energy is wasted. This relatively low efficiency highlights the importance of further examining the energy and water waste in hot water distribution systems.

  7. Distribution Effectiveness and Impacts on Equipment Sizing for Residential Thermal Distribution Systems

    E-Print Network [OSTI]

    1 LBNL-43724 Distribution Effectiveness and Impacts on Equipment Sizing for Residential Thermal Distribution Systems Walker, I., Sherman, M., and Siegel, J. Environmental Energy Technologies Division Energy

  8. Distributed and Power Efficient Routing in Wireless Cooperative Networks

    E-Print Network [OSTI]

    Leung, Kin K.

    transmission strategy (MPSDF) achieves average energy saving of 82.43% compared to direct transmission Ding, and Kin K Leung* *Department of Electrical and Electronic Engineering, Imperial College, UK Department of Communication Systems, Lancaster University, UK Email: zhengguo.sheng06@imperial.ac.uk Abstract

  9. IBM and Energy Efficiency: Systems Recommisiong and Optimization 

    E-Print Network [OSTI]

    Veilleux, Y.; Boulianne, J. P.; Lefebvre, P.

    2013-01-01

    and revision of calibration process; and Tuning of PID control loops. IBM Bromont Manufacturing Plant IBM and Energy Efficiency - Recommissioning: Improving Buildings Systems Efficiency ? 2013 IBM Corporation8 Boilers: Steam pressure optimization Before.... The recommissioning and optimization program for the HVAC systems was established and based on the following activities: IBM Bromont Recommissioning Program: HVAC HVAC Systems Optimization Key Activities IBM Bromont Manufacturing Plant IBM and Energy Efficiency...

  10. Technology and System Level Demonstration of Highly Efficient...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    and Peer Evaluation arravt081vssnewhouse2011o.pdf More Documents & Publications Technology and System Level Demonstration of Highly Efficient and Clean, Diesel Powered Class 8...

  11. Technology and System Level Demonstration of Highly Efficient...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Evaluation Meeting arravt081vssnewhouse2012o.pdf More Documents & Publications Technology and System Level Demonstration of Highly Efficient and Clean, Diesel Powered Class 8...

  12. Measuring Advances in HVAC Distribution System Design

    E-Print Network [OSTI]

    Franconi, E.

    2011-01-01

    Energy Efficiency and Renewable Energy, Office of BuildingEnergy Efficiency and Renewable Energy, Office of Building

  13. Alternative Export - Wheat Distribution Systems for the Texas - Oklahoma Panhandle. 

    E-Print Network [OSTI]

    Fuller, Stephen W.; Shanmugham C.V.

    1980-01-01

    to be the most efficient of the export-wheat bility and potential cost savings of operating wheat- distribution systems. For the six-county area, this carrying unit trains between a six-county area in the would annually generate marketing-systemsavings Texas-Oklahoma... is a major source of income for U.S. and South Plains grain producers. Historically, wheat has ranked as one of the most valuable crops in Texas and Oklahoma, states that are major producers of the annual Hard Red Winter wheat national output...

  14. Alexandru Iosup Parallel and Distributed Systems Group

    E-Print Network [OSTI]

    Langendoen, Koen

    ­ the Netherlands ­ Europe founded 13th century pop: 100,000 pop.: 100,000 pop: 16.5 M pop: 100,000 founded 1842 pop: 13,000 pop.: 100,000 (We are here) #12;The Parallel and Distributed Systems Group at TU Delft Johan Challenges and High Quality Time ­ A. Iosup 5 #12;Online Gaming used to be art, may now be computing

  15. Solid oxide fuel cell systems with hot zones having improved reactant distribution

    DOE Patents [OSTI]

    Poshusta, Joseph C.; Booten, Charles W.; Martin, Jerry L.

    2012-11-06

    A Solid Oxide Fuel Cell (SOFC) system having a hot zone with a center cathode air feed tube for improved reactant distribution, a CPOX reactor attached at the anode feed end of the hot zone with a tail gas combustor at the opposing end for more uniform heat distribution, and a counter-flow heat exchanger for efficient heat retention.

  16. Solid oxide fuel cell systems with hot zones having improved reactant distribution

    DOE Patents [OSTI]

    Poshusta, Joseph C; Booten, Charles W; Martin, Jerry L

    2013-12-24

    A Solid Oxide Fuel Cell (SOFC) system having a hot zone with a center cathode air feed tube for improved reactant distribution, a CPOX reactor attached at the anode feed end of the hot zone with a tail gas combustor at the opposing end for more uniform heat distribution, and a counter-flow heat exchanger for efficient heat retention.

  17. The Chain-Length Distribution in Subcritical Systems

    SciTech Connect (OSTI)

    Steven Douglas Nolen

    2000-06-01

    The individual fission chains that appear in any neutron multiplying system provide a means, via neutron noise analysis, to unlock a wealth of information regarding the nature of the system. This work begins by determining the probability density distributions for fission chain lengths in zero-dimensional systems over a range of prompt neutron multiplication constant (K) values. This section is followed by showing how the integral representation of the chain-length distribution can be used to obtain an estimate of the system's subcritical prompt multiplication (MP). The lifetime of the chains is then used to provide a basis for determining whether a neutron noise analysis will be successful in assessing the neutron multiplication constant, k, of the system in the presence of a strong intrinsic source. A Monte Carlo transport code, MC++, is used to model the evolution of the individual fission chains and to determine how they are influenced by spatial effects. The dissertation concludes by demonstrating how experimental validation of certain global system parameters by neutron noise analysis may be precluded in situations in which the system K is relatively low and in which realistic detector efficiencies are simulated.

  18. Energy Efficient Relaying Games in Cooperative Wireless Transmission Systems

    E-Print Network [OSTI]

    Brown III, Donald R.

    Energy Efficient Relaying Games in Cooperative Wireless Transmission Systems Jie Yang and D information for others. This paper considers the effect of selfishness on energy efficiency using a non efficiency close to that of centrally optimized energy allocation in many cases. I. Introduction In energy

  19. Foundational Report Series. Advanced Distribution management Systems for Grid Modernization (Importance of DMS for Distribution Grid Modernization)

    SciTech Connect (OSTI)

    Wang, Jianhui

    2015-09-01

    Grid modernization is transforming the operation and management of electric distribution systems from manual, paper-driven business processes to electronic, computer-assisted decisionmaking. At the center of this business transformation is the distribution management system (DMS), which provides a foundation from which optimal levels of performance can be achieved in an increasingly complex business and operating environment. Electric distribution utilities are facing many new challenges that are dramatically increasing the complexity of operating and managing the electric distribution system: growing customer expectations for service reliability and power quality, pressure to achieve better efficiency and utilization of existing distribution system assets, and reduction of greenhouse gas emissions by accommodating high penetration levels of distributed generating resources powered by renewable energy sources (wind, solar, etc.). Recent “storm of the century” events in the northeastern United States and the lengthy power outages and customer hardships that followed have greatly elevated the need to make power delivery systems more resilient to major storm events and to provide a more effective electric utility response during such regional power grid emergencies. Despite these newly emerging challenges for electric distribution system operators, only a small percentage of electric utilities have actually implemented a DMS. This paper discusses reasons why a DMS is needed and why the DMS may emerge as a mission-critical system that will soon be considered essential as electric utilities roll out their grid modernization strategies.

  20. Advanced Non-Distributed Operating Systems Course Yair Wiseman

    E-Print Network [OSTI]

    Wiseman, Yair

    1 Advanced Non-Distributed Operating Systems Course Yair Wiseman Computer Science Department Bar://www.cs.biu.ac.il/~wiseman wiseman@cs.huji.ac.il Keywords: Operating Systems, Graduate Course, Operating System Kernel, Non-Distributed Operating Systems. Abstract The use of Non-Distributed Operating Systems is very common and old. Many

  1. On-Site Wastewater Treatment Systems: Spray Distribution (Spanish) 

    E-Print Network [OSTI]

    Lesikar, Bruce J.; Enciso, Juan

    1999-08-12

    Spray distribution systems for wastewater treated on site are much like lawn irrigation systems. This publication explains the advantages, disadvantages, maintenance steps and estimated costs of spray distribution systems.

  2. On-Site Wastewater Treatment Systems: Subsurface Drip Distribution 

    E-Print Network [OSTI]

    Lesikar, Bruce J.

    1999-09-06

    A subsurface drip system distributes wastewater to the lawn through a system of tubing installed below the ground. This publication explains the advantages and disadvantages of subsurface drip distribution systems, as well ...

  3. Adaptive electrocardiogram feature extraction on distributed embedded systems

    E-Print Network [OSTI]

    Jafari, R; Noshadi, H; Ghiasi, S; Sarrafzadeh, M

    2006-01-01

    Approach to Networked Embedded Systems,” PLDI ’03: Proc. ACMON DISTRIBUTED EMBEDDED SYSTEMS Fig. 1. ECG analysismainly interested in embedded system design and analysis and

  4. Improving Energy Efficiency by Developing Components for Distributed Cooling and Heating Based on Thermal Comfort Modeling

    Office of Energy Efficiency and Renewable Energy (EERE)

    Develop distributed HVAC components to supplement the central HVAC system to reduce the energy required by current compressed gas air conditioners by at least one-third.

  5. Distributed Sensor Coordination for Advanced Energy Systems

    SciTech Connect (OSTI)

    Tumer, Kagan

    2013-07-31

    The ability to collect key system level information is critical to the safe, efficient and reli- able operation of advanced energy systems. With recent advances in sensor development, it is now possible to push some level of decision making directly to computationally sophisticated sensors, rather than wait for data to arrive to a massive centralized location before a decision is made. This type of approach relies on networked sensors (called “agents” from here on) to actively collect and process data, and provide key control deci- sions to significantly improve both the quality/relevance of the collected data and the as- sociating decision making. The technological bottlenecks for such sensor networks stem from a lack of mathematics and algorithms to manage the systems, rather than difficulties associated with building and deploying them. Indeed, traditional sensor coordination strategies do not provide adequate solutions for this problem. Passive data collection methods (e.g., large sensor webs) can scale to large systems, but are generally not suited to highly dynamic environments, such as ad- vanced energy systems, where crucial decisions may need to be reached quickly and lo- cally. Approaches based on local decisions on the other hand cannot guarantee that each agent performing its task (maximize an agent objective) will lead to good network wide solution (maximize a network objective) without invoking cumbersome coordination rou- tines. There is currently a lack of algorithms that will enable self-organization and blend the efficiency of local decision making with the system level guarantees of global decision making, particularly when the systems operate in dynamic and stochastic environments. In this work we addressed this critical gap and provided a comprehensive solution to the problem of sensor coordination to ensure the safe, reliable, and robust operation of advanced energy systems. The differentiating aspect of the proposed work is in shift- ing the focus towards “what to observe” rather than “how to observe” in large sensor networks, allowing the agents to actively determine both the structure of the network and the relevance of the information they are seeking to collect. In addition to providing an implicit coordination mechanism, this approach allows the system to be reconfigured in response to changing needs (e.g., sudden external events requiring new responses) or changing sensor network characteristics (e.g., sudden changes to plant condition). Outcome Summary: All milestones associated with this project have been completed. In particular, private sensor objective functions were developed which are aligned with the global objective function, sensor effectiveness has been improved by using “sensor teams,” system efficiency has been improved by 30% using difference evaluation func- tions, we have demonstrated system reconfigurability for 20% changes in system con- ditions, we have demonstrated extreme scalability of our proposed algorithm, we have demonstrated that sensor networks can overcome disruptions of up to 20% in network conditions, and have demonstrated system reconfigurability to 20% changes in system conditions in hardware-based simulations. This final report summarizes how each of these milestones was achieved, and gives insight into future research possibilities past the work which has been completed. The following publications support these milestones [6, 8, 9, 10, 16, 18, 19].

  6. Fair and Efficient Secure Multiparty Computation with Reputation Systems

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Fair and Efficient Secure Multiparty Computation with Reputation Systems Gilad Asharov, Yehuda majority are not obtained. Keywords: secure multiparty computation, reputation systems, new models 1 Lindell, and Hila Zarosim Dept. of Computer Science, Bar-Ilan University, Israel {asharog

  7. CIBO's Energy Efficiency Handbook for Steam Power Systems 

    E-Print Network [OSTI]

    Bessette, R. D.

    1997-01-01

    The Council of Industrial Boiler Owners (CIBO) has developed a handbook to help boiler operators get the best performance from their industrial steam systems. This energy efficiency handbook takes a comprehensive look at the boiler and steam system...

  8. SPECTRALLY EFFICIENT MULTICARRIER SYSTEMS FOR FIBER-OPTIC TRANSMISSION

    E-Print Network [OSTI]

    Zhang, Yuanyuan

    2012-05-31

    The purpose of this research is to provide a comprehensive study of spectrally efficient multicarrier systems for fiber-optic transmission. Multicarrier optical systems partition a high-data rate digital signal in a wavelength channel into multiple...

  9. Distribution System Analysis Tools for Studying High Penetration of PV

    E-Print Network [OSTI]

    Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support Features Electric Energy System #12;#12;Distribution System Analysis Tools for Studying High Penetration of PV project titled "Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support

  10. Improving Energy Efficiency of Compressed Air System Based on System Audit

    E-Print Network [OSTI]

    Shanghai, Hongbo Qin; McKane, Aimee

    2008-01-01

    plan, formulate energy efficiency goals and adopt energyGO-102004-1926 [3] Energy Efficiency and Market Potential ofImproving Energy Efficiency of Compressed Air System Based

  11. Efficient quantum key distribution scheme with pre-announcing the basis

    E-Print Network [OSTI]

    Jingliang Gao; Changhua Zhu; Heling Xiao

    2014-10-21

    We devise a new quantum key distribution scheme that is more efficient than the BB84 protocol. By pre-announcing basis, Alice and Bob are more likely to use the same basis to prepare and measure the qubits, thus achieves a higher efficiency. The error analysis is revised and its security against any eavesdropping is proven briefly. Furthermore we show that, compared with the LCA scheme, our modification can be applied in more quantum channels.

  12. Energy-Efficient Transmission Schemes in Cooperative Cellular Systems

    E-Print Network [OSTI]

    Yang, Wei; Wang, Ying; Sun, Wanlu

    2010-01-01

    Energy-efficient communication is an important requirement for mobile devices, as the battery technology has not kept up with the growing requirements stemming from ubiquitous multimedia applications. This paper considers energy-efficient transmission schemes in cooperative cellular systems with unbalanced traffic between uplink and downlink. Theoretically, we derive the optimal transmission data rate, which minimizes the total energy consumption of battery-powered terminals per information bit. The energy-efficient cooperation regions are then investigated to illustrate the effects of relay locations on the energy-efficiency of the systems, and the optimal relay location is found for maximum energy-efficiency. Finally, numerical results are provided to demonstrate the tradeoff between energy-efficiency and spectral efficiency.

  13. Aruna Ravinagarajan System Energy Efficiency Lab

    E-Print Network [OSTI]

    Wang, Deli

    scheduler needs toThe task scheduler needs to manage energy consumptionmanage energy consumption energy harvesting Operating with severe energy constraints Too much data to continually transmit Energy Efficiency Lab 12 Execution Time Constraint Given a time limit, what is the highest level of data

  14. Water Heaters and Hot Water Distribution Systems

    E-Print Network [OSTI]

    Lutz, Jim

    2012-01-01

    24 Figure 7. Comparison of Daily Water Heater28 Figure 8. Monitored Field Efficiency of Tankless Water28 Figure 9. Monitored Lab Efficiency of Tankless Water

  15. Energy-efficient lighting system for television

    DOE Patents [OSTI]

    Cawthorne, Duane C. (Amarillo, TX)

    1987-07-21

    A light control system for a television camera comprises an artificial light control system which is cooperative with an iris control system. This artificial light control system adjusts the power to lamps illuminating the camera viewing area to provide only sufficient artificial illumination necessary to provide a sufficient video signal when the camera iris is substantially open.

  16. On Locality in Distributed Storage Systems

    E-Print Network [OSTI]

    Rawat, Ankit Singh

    2012-01-01

    This paper studies the design of codes for distributed storage systems (DSS) that enable local repair in the event of node failure. This paper presents locally repairable codes based on low degree multivariate polynomials. Its code construction mechanism extends work on Noisy Interpolating Set by Dvir et al. \\cite{dvir2011}. The paper presents two classes of codes that allow node repair to be performed by contacting 2 and 3 surviving nodes respectively. It further shows that both classes are good in terms of their rate and minimum distance, and allow their rate to be bartered for greater flexibility in the repair process.

  17. Hot Water Distribution System Model Enhancements

    SciTech Connect (OSTI)

    Hoeschele, M.; Weitzel, E.

    2012-11-01

    This project involves enhancement of the HWSIM distribution system model to more accurately model pipe heat transfer. Recent laboratory testing efforts have indicated that the modeling of radiant heat transfer effects is needed to accurately characterize piping heat loss. An analytical methodology for integrating radiant heat transfer was implemented with HWSIM. Laboratory test data collected in another project was then used to validate the model for a variety of uninsulated and insulated pipe cases (copper, PEX, and CPVC). Results appear favorable, with typical deviations from lab results less than 8%.

  18. Quasiprobability distributions in open quantum systems: spin-qubit systems

    E-Print Network [OSTI]

    Kishore Thapliyal; Subhashish Banerjee; Anirban Pathak; S. Omkar; V. Ravishankar

    2015-04-08

    Quasiprobability distributions (QDs) in open quantum systems are investigated for $SU(2)$, spin like systems, having relevance to quantum optics and information. In this work, effect of both quantum non-demolition (QND) and dissipative open quantum systems, on the evolution of a number of spin QDs are investigated. Specifically, compact analytic expressions for the $W$, $P$, $Q$, and $F$ functions are obtained for some interesting single, two and three qubit states, undergoing general open system evolutions. Further, corresponding QDs are reported for an N qubit Dicke model and a spin-1 system. The existence of nonclassical characteristics are observed in all the systems investigated here. The study leads to a clear understanding of quantum to classical transition in a host of realistic physical scenarios. Variation of the amount of nonclassicality observed in the quantum systems, studied here,are also investigated using nonclassical volume.

  19. Interconnecting PV on New York City's Secondary Network Distribution System

    SciTech Connect (OSTI)

    Anderson, K.; Coddington, M.; Burman, K.; Hayter, S.; Kroposki, B.; Watson, A.

    2009-12-01

    This study describes technical assistance provided by NREL to help New York City and Con Edison improve the interconnection of distributed PV systems on a secondary network distribution system.

  20. On-Site Wastewater Treatment Systems: Spray Distribution 

    E-Print Network [OSTI]

    Lesikar, Bruce J.

    1999-09-06

    A spray distribution system is very similar to a lawn irrigation system. Spray heads are used to distribute treated wastewater to the surface of the yard. This publication explains the advantages and disadvantages of spray ...

  1. Residential hot water distribution systems: Roundtablesession

    SciTech Connect (OSTI)

    Lutz, James D.; Klein, Gary; Springer, David; Howard, Bion D.

    2002-08-01

    Residential building practice currently ignores the lossesof energy and water caused by the poor design of hot water systems. Theselosses include: combustion and standby losses from water heaters, thewaste of water (and energy) while waiting for hot water to get to thepoint of use; the wasted heat as water cools down in the distributionsystem after a draw; heat losses from recirculation systems and thediscarded warmth of waste water as it runs down the drain. Severaltechnologies are available that save energy (and water) by reducing theselosses or by passively recovering heat from wastewater streams and othersources. Energy savings from some individual technologies are reported tobe as much as 30 percent. Savings calculations of prototype systemsincluding bundles of technologies have been reported above 50 percent.This roundtable session will describe the current practices, summarizethe results of past and ongoing studies, discuss ways to think about hotwater system efficiency, and point to areas of future study. We will alsorecommend further steps to reduce unnecessary losses from hot waterdistribution systems.

  2. Physical Effects of Distributed PV Generation on California's Distribution System

    E-Print Network [OSTI]

    Cohen, Michael A

    2015-01-01

    Deployment of high-penetration photovoltaic (PV) power is expected to have a range of effects -- both positive and negative -- on the distribution grid. The magnitude of these effects may vary greatly depending upon feeder topology, climate, PV penetration level, and other factors. In this paper we present a simulation study of eight representative distribution feeders in three California climates at PV penetration levels up to 100\\%, supported by a unique database of distributed PV generation data that enables us to capture the impact of PV variability on feeder voltage and voltage regulating equipment. When comparing the influence of feeder location (i.e. climate) versus feeder type on outcomes, we find that location more strongly influences the incidence of reverse power flow, reductions in peak loading and the presence of voltage excursions. On the other hand, we find that feeder characteristics more strongly influence the magnitude of loss reduction and changes in voltage regulator operations. We find th...

  3. Efficient Integration of Web Services with Distributed Data Flow and Active Mediation

    E-Print Network [OSTI]

    Stanford University

    Efficient Integration of Web Services with Distributed Data Flow and Active Mediation David Liu multiple web services that are not fully compatible in terms of data formats and contents. Active mediation the performance of an application utilizing multiple web services. Categories and Subject Descriptors D.2

  4. Energy-efficiency and Security Issues in the Cisco Nexus Virtual Distributed Benjamin Peterson

    E-Print Network [OSTI]

    Politčcnica de Catalunya, Universitat

    Energy-efficiency and Security Issues in the Cisco Nexus Virtual Distributed Switching Benjamin--Virtualization technologies have brought with them the promise of increased security and energy saving. Such was the case with the Cisco Nexus virtual switching environment. However, possible security issues of this environment have

  5. Distributed Topology Control for Power Efficient Operation in Multihop Wireless Ad Hoc Networks

    E-Print Network [OSTI]

    of a wireless network that is operating on battery power is limited by the capacity of its energy sourceDistributed Topology Control for Power Efficient Operation in Multihop Wireless Ad Hoc Networks of wireless multihop ad hoc net- works can be controlled by varying the transmission power of each node. We

  6. A Distributed Scheme for Efficient Pair-wise Comparison of Complete Genomes

    E-Print Network [OSTI]

    Bansal, Arvind K.

    #12;48 A Distributed Scheme for Efficient Pair-wise Comparison of Complete Genomes Valerian S}@mcs.kent.edu 1 Corresponding author Abstract The comparisons of newly sequenced genomes against a genome and a CORBA-based implementation to compare and align gene sequences in large complete genomes, using multiple

  7. Distributed Battery Control to Improve Peak Power Shaving Efficiency in Data Centers

    E-Print Network [OSTI]

    Simunic, Tajana

    Distributed Battery Control to Improve Peak Power Shaving Efficiency in Data Centers Baris Aksanli, Eddie Pettis and Tajana S. Rosing UCSD, Google Stored energy in batteries can be used to cap peak power.8% 99% 91.5% 84% Battery Configuration StudyBattery Configuration Study Goal: Improve the overall

  8. Distributed Operating Systems ANDREW S. TANENBAUM and ROBBERT VAN RENESSE

    E-Print Network [OSTI]

    Newhall, Tia

    Distributed Operating Systems ANDREW S. TANENBAUM and ROBBERT VAN RENESSE Department of Mathematics and Computer Science, Vrije Universiteit, Amsterdam, The Netherlands Distributed operating systems have many as an introduction to distributed operating systems, and especially to current university research about them. After

  9. Rebuilding for Array Codes in Distributed Storage Systems

    E-Print Network [OSTI]

    Bruck, Jehoshua (Shuki)

    Rebuilding for Array Codes in Distributed Storage Systems Zhiying Wang Electrical Engineering of Technology Pasadena, CA 91125 Email: bruck@caltech.edu Abstract--In distributed storage systems that use arises. We consider the problem of repairing an erased node in a distributed storage system that uses

  10. Asymptotic Interference Alignment for Exact Repair in Distributed Storage Systems

    E-Print Network [OSTI]

    Jafar, Syed A.

    Asymptotic Interference Alignment for Exact Repair in Distributed Storage Systems Viveck R. Cadambe consider a distributed storage system where a file of size M is stored in n distributed storage nodes using of this paper is to repair failed nodes in the storage system, by replacing them by their replicas (exact repair

  11. High Quantum Efficiency OLED Lighting Systems

    SciTech Connect (OSTI)

    Shiang, Joseph [General Electric (GE) Global Research, Fairfield, CT (United States)

    2011-09-30

    The overall goal of the program was to apply improvements in light outcoupling technology to a practical large area plastic luminaire, and thus enable the product vision of an extremely thin form factor high efficiency large area light source. The target substrate was plastic and the baseline device was operating at 35 LPW at the start of the program. The target LPW of the program was a >2x improvement in the LPW efficacy and the overall amount of light to be delivered was relatively high 900 lumens. Despite the extremely difficult challenges associated with scaling up a wet solution process on plastic substrates, the program was able to make substantial progress. A small molecule wet solution process was successfully implemented on plastic substrates with almost no loss in efficiency in transitioning from the laboratory scale glass to large area plastic substrates. By transitioning to a small molecule based process, the LPW entitlement increased from 35 LPW to 60 LPW. A further 10% improvement in outcoupling efficiency was demonstrated via the use of a highly reflecting cathode, which reduced absorptive loss in the OLED device. The calculated potential improvement in some cases is even larger, ~30%, and thus there is considerable room for optimism in improving the net light coupling efficacy, provided absorptive loss mechanisms are eliminated. Further improvements are possible if scattering schemes such as the silver nanowire based hard coat structure are fully developed. The wet coating processes were successfully scaled to large area plastic substrate and resulted in the construction of a 900 lumens luminaire device.

  12. 6.824 Distributed Computer Systems, Fall 2002

    E-Print Network [OSTI]

    Morris, Robert Tappan

    Abstractions and implementation techniques for design of distributed systems; server design, network programming, naming, storage systems, security, and fault tolerance. Readings from current literature. 6 Engineering ...

  13. Control and regulation of modern distribution system, ForskEL...

    Open Energy Info (EERE)

    is to study the effects of load management sys tems and online real time electricity pricing systems in modern distribution systems and to develop the models, operation and...

  14. Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation

    SciTech Connect (OSTI)

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

    2004-09-30

    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.

  15. DOE Zero Energy Ready Home Efficient Hot Water Distribution II-- How to Get it Right Webinar (Text Version)

    Broader source: Energy.gov [DOE]

    Below is the text version of the webinar, Efficient Hot Water Distribution II -- How to Get it Right, presented in January2014.

  16. Cathode power distribution system and method of using the same for power distribution

    DOE Patents [OSTI]

    Williamson, Mark A; Wiedmeyer, Stanley G; Koehl, Eugene R; Bailey, James L; Willit, James L; Barnes, Laurel A; Blaskovitz, Robert J

    2014-11-11

    Embodiments include a cathode power distribution system and/or method of using the same for power distribution. The cathode power distribution system includes a plurality of cathode assemblies. Each cathode assembly of the plurality of cathode assemblies includes a plurality of cathode rods. The system also includes a plurality of bus bars configured to distribute current to each of the plurality of cathode assemblies. The plurality of bus bars include a first bus bar configured to distribute the current to first ends of the plurality of cathode assemblies and a second bus bar configured to distribute the current to second ends of the plurality of cathode assemblies.

  17. Evaluation of higher distribution and/or utilization voltages. Second interim report (March 1979): identification of components and parameters for cost and energy-efficiency analysis

    SciTech Connect (OSTI)

    Not Available

    1981-04-01

    This interim report provides documentation on the second task, Identification of Components and Parameters for Cost and Energy-Efficiency Analysis, of DOE Contract No. ET-78-C-01-2866, Evaluation of Higher Distribution and/or Utilization Voltages. The work performed under this task includes an identification of the elements of the distribution/utilization system, a characterization of the distribution elements and a characterization of end use elements. The purpose of this task is to identify the distribution and utilization system elements which will be subjected to a detailed analysis and computer modeling in later tasks. The elements identified are characterized in terms of their interface with other elements in the system and with respect to their energy consumption, efficiency, and costs. A major output of this task is a list of elements to be modeled under Task 3 and a set of specifications for the computer model to be developed under that task.

  18. HVAC & Building Management Control System Energy Efficiency Replacements

    SciTech Connect (OSTI)

    Hernandez, Adriana

    2012-09-21

    The project objective was the replacement of an aging, un-repairable HVAC system which has grown inefficient and a huge energy consumer with low energy and efficient HVAC units, and installation of energy efficient building control technologies at City's YMCA Community Center.

  19. Clock distribution system for digital computers

    DOE Patents [OSTI]

    Wyman, Robert H. (Brentwood, CA); Loomis, Jr., Herschel H. (Davis, CA)

    1981-01-01

    Apparatus for eliminating, in each clock distribution amplifier of a clock distribution system, sequential pulse catch-up error due to one pulse "overtaking" a prior clock pulse. The apparatus includes timing means to produce a periodic electromagnetic signal with a fundamental frequency having a fundamental frequency component V'.sub.01 (t); an array of N signal characteristic detector means, with detector means No. 1 receiving the timing means signal and producing a change-of-state signal V.sub.1 (t) in response to receipt of a signal above a predetermined threshold; N substantially identical filter means, one filter means being operatively associated with each detector means, for receiving the change-of-state signal V.sub.n (t) and producing a modified change-of-state signal V'.sub.n (t) (n=1, . . . , N) having a fundamental frequency component that is substantially proportional to V'.sub.01 (t-.theta..sub.n (t) with a cumulative phase shift .theta..sub.n (t) having a time derivative that may be made uniformly and arbitrarily small; and with the detector means n+1 (1.ltoreq.n

  20. Detection of contamination of municipal water distribution systems

    DOE Patents [OSTI]

    Cooper, John F. (Oakland, CA)

    2012-01-17

    A system for the detection of contaminates of a fluid in a conduit. The conduit is part of a fluid distribution system. A chemical or biological sensor array is connected to the conduit. The sensor array produces an acoustic signal burst in the fluid upon detection of contaminates in the fluid. A supervisory control system connected to the fluid and operatively connected to the fluid distribution system signals the fluid distribution system upon detection of contaminates in the fluid.

  1. Steam Power Partnership: Improving Steam System Efficiency Through Marketplace Partnerships 

    E-Print Network [OSTI]

    Jones, T.

    1997-01-01

    The Alliance to Save Energy, a national nonprofit organization based in Washington DC, and the U.S. Department of Energy are working with energy efficiency suppliers to promote the comprehensive upgrade of industrial steam systems. Like EPA's Green...

  2. Energy-efficient system design for mobile processing platforms

    E-Print Network [OSTI]

    Rithe, Rahul (Rahulkumar Jagdish)

    2014-01-01

    Portable electronics has fueled the rich emergence of multimedia applications that have led to the exponential growth in content creation and consumption. New energy-efficient integrated circuits and systems are necessary ...

  3. Ultra Efficient Combined Heat, Hydrogen, and Power System

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Ultra Efficient Combined Heat, Hydrogen, and Power System DE-EE0003679 FuelCell Energy, Inc. 1012010 - 9302011 Pinakin Patel FuelCell Energy Inc. ppatel@fce.com 203-825-6072...

  4. Financing; A Cost Effective Alternative When Upgrading Energy Efficient Systems 

    E-Print Network [OSTI]

    Ertle, J. M.

    1994-01-01

    In the 1990's, many organizations are attempting to do more, faster, with less cost and improved quality. In many cases, this involves improving the efficiency of their systems. Increased competition is creating pressure ...

  5. Design and global optimization of high-efficiency thermophotovoltaic systems

    E-Print Network [OSTI]

    Bermel, Peter A.

    Despite their great promise, small experimental thermophotovoltaic (TPV) systems at 1000 K generally exhibit extremely low power conversion efficiencies (approximately 1%), due to heat losses such as thermal emission of ...

  6. POEM: Power-efficient Occupancy-based Energy Management System

    E-Print Network [OSTI]

    Cerpa, Alberto E.

    is electrical energy [1]. Of this total, 50% of the energy consumed in buildings is used for heating, air-conditioningPOEM: Power-efficient Occupancy-based Energy Management System Varick L. Erickson Elect. Eng for Heating Ventilation and Air-Conditioning (HVAC) systems. Current HVAC systems only condition based

  7. Secure and Efficient Routable Control Systems

    SciTech Connect (OSTI)

    Edgar, Thomas W.; Hadley, Mark D.; Manz, David O.; Winn, Jennifer D.

    2010-05-01

    This document provides the methods to secure routable control system communication in the electric sector. The approach of this document yields a long-term vision for a future of secure communication, while also providing near term steps and a roadmap. The requirements for the future secure control system environment were spelled out to provide a final target. Additionally a survey and evaluation of current protocols was used to determine if any existing technology could achieve this goal. In the end a four-step path was described that brought about increasing requirement completion and culminates in the realization of the long term vision.

  8. Comparison of energy efficiency between variable refrigerant flow systems and ground source heat pump systems

    SciTech Connect (OSTI)

    Hong, Tainzhen; Liu, Xaiobing

    2009-11-01

    With the current movement toward net zero energy buildings, many technologies are promoted with emphasis on their superior energy efficiency. The variable refrigerant flow (VRF) and ground source heat pump (GSHP) systems are probably the most competitive technologies among these. However, there are few studies reporting the energy efficiency of VRF systems compared with GSHP systems. In this article, a preliminary comparison of energy efficiency between the air-source VRF and GSHP systems is presented. The computer simulation results show that GSHP system is more energy efficient than the air-source VRF system for conditioning a small office building in two selected US climates. In general, GSHP system is more energy efficient than the air-source VRV system, especially when the building has significant heating loads. For buildings with less heating loads, the GSHP system could still perform better than the air-source VRF system in terms of energy efficiency, but the resulting energy savings may be marginal.

  9. Energy Efficiency in Compressed Air Systems 

    E-Print Network [OSTI]

    Hingorani, A.; Pavlov, A.

    2010-01-01

    Energy use in compressed air systems accounts for typically 10% of the total industrial electricity consumption. It also accounts for close to 99% of the CO2 footprint of an air compressor and approximately 80% of the life cycle costs of a...

  10. DESIGNING EFFICIENT MEMORY FOR FUTURE COMPUTING SYSTEMS

    E-Print Network [OSTI]

    Balasubramonian, Rajeev

    , limited pin counts, increasing heterogeneity and complexity, and the diminished importance of cost main memory system with the following innovative features: (i) overfetch-aware re-organized chips, (ii) low-cost silicon photonic memory channels, (iii) largely autonomous memory modules with a packet

  11. Characterizing and Improving Distributed Intrusion Detection Systems.

    SciTech Connect (OSTI)

    Hurd, Steven A.; Proebstel, Elliot P.

    2007-11-01

    Due to ever-increasing quantities of information traversing networks, network administrators are developing greater reliance upon statistically sampled packet information as the source for their intrusion detection systems (IDS). Our research is aimed at understanding IDS performance when statistical packet sampling is used. Using the Snort IDS and a variety of data sets, we compared IDS results when an entire data set is used to the results when a statistically sampled subset of the data set is used. Generally speaking, IDS performance with statistically sampled information was shown to drop considerably even under fairly high sampling rates (such as 1:5). Characterizing and Improving Distributed Intrusion Detection Systems4AcknowledgementsThe authors wish to extend our gratitude to Matt Bishop and Chen-Nee Chuah of UC Davis for their guidance and support on this work. Our thanks are also extended to Jianning Mai of UC Davis and Tao Ye of Sprint Advanced Technology Labs for their generous assistance.We would also like to acknowledge our dataset sources, CRAWDAD and CAIDA, without which this work would not have been possible. Support for OC48 data collection is provided by DARPA, NSF, DHS, Cisco and CAIDA members.

  12. Managing Uncertainty in Operational Control of Water Distribution Systems

    E-Print Network [OSTI]

    Bargiela, Andrzej

    Managing Uncertainty in Operational Control of Water Distribution Systems A. Bargiela Department Operation of water distribution systems requires a variety of decisions to be made. There are system. There are system management decisions concerning the regulatory measures such as water pricing principles, effluent

  13. STATE OF CALIFORNIA DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE

    E-Print Network [OSTI]

    STATE OF CALIFORNIA DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE CEC-MECH-14A (Revised 08/09) CALIFORNIA ENERGY COMMISSION CERTIFICATE OF ACCEPTANCE MECH-14A NA7.5.13 Distributed Energy Storage DX AC DISTRIBUTED ENERGY STORAGE DX AC SYSTEMES ACCEPTANCE CEC-MECH-14A (Revised 08/09) CALIFORNIA ENERGY COMMISSION

  14. High efficiency stoichiometric internal combustion engine system

    DOE Patents [OSTI]

    Winsor, Richard Edward (Waterloo, IA); Chase, Scott Allen (Cedar Falls, IA)

    2009-06-02

    A power system including a stoichiometric compression ignition engine in which a roots blower is positioned in the air intake for the engine to control air flow. Air flow is decreased during part power conditions to maintain the air-fuel ratio in the combustion chamber of the engine at stoichiometric, thus enabling the use of inexpensive three-way catalyst to reduce oxides of nitrogen. The roots blower is connected to a motor generator so that when air flow is reduced, electrical energy is stored which is made available either to the roots blower to temporarily increase air flow or to the system electrical load and thus recapture energy that would otherwise be lost in reducing air flow.

  15. Global Trees: A Framework for Linked Data Structures on Distributed Memory Parallel Systems

    SciTech Connect (OSTI)

    Larkins, D. B.; Dinan, James S.; Krishnamoorthy, Sriram; Parthasarathy, Srinivasan; Rountev, Atanas; Sadayappan, Ponnuswamy

    2008-11-17

    This paper describes the Global Trees (GT) system that provides a multi-layered interface to a global address space view of distributed tree data structures, while providing scalable performance on distributed memory systems. The Global Trees system utilizes coarse-grained data movement to enhance locality and communication efficiency. We describe the design and implementation of GT, illustrate its use in the context of a gravitational simulation application, and provide experimental results that demonstrate the effectiveness of the approach. The key benefits of using this system include efficient sharedmemory style programming of distributed trees, tree-specific optimizations for data access and computation, and the ability to customize many aspects of GT to optimize application performance.

  16. Select an Energy-Efficient Centrifugal Pump - Pumping System Tip Sheet #3

    SciTech Connect (OSTI)

    2005-10-01

    BestPractices Program tip sheet discussing pumping system efficiency by selecting an energy-efficient centrifugal pump.

  17. Water Heaters and Hot Water Distribution Systems

    E-Print Network [OSTI]

    Lutz, Jim

    2012-01-01

    the 2008 Title- 24 Residential Building Energy Efficiencythe 2008 Title- 24 Residential Building Energy Efficiencythe 2008 Title- 24 Residential Building Energy Efficiency

  18. SUEZ: A Distributed Safe Execution Environment for System Administration Trials

    E-Print Network [OSTI]

    Venkatakrishnan, V.N.

    SUEZ: A Distributed Safe Execution Environment for System Administration Trials Doo San Sim and V of safely and conveniently performing ``trial'' experiments in system administration tasks. System administrators often perform such trial executions that involve installing new software or experimenting

  19. Energy Efficiency Maximization of Practical Wireless Communication Systems

    E-Print Network [OSTI]

    ERASLAN, EREN

    2013-01-01

    Energy Efficiency MaximizationImportance of Energy Efficiency in Modern Wirelessfor Energy Efficiency Maximization . . . . . . . . .

  20. Energy efficiency in wireless communication systems

    DOE Patents [OSTI]

    Caffrey, Michael Paul; Palmer, Joseph McRae

    2012-12-11

    Wireless communication systems and methods utilize one or more remote terminals, one or more base terminals, and a communication channel between the remote terminal(s) and base terminal(s). The remote terminal applies a direct sequence spreading code to a data signal at a spreading factor to provide a direct sequence spread spectrum (DSSS) signal. The DSSS signal is transmitted over the communication channel to the base terminal which can be configured to despread the received DSSS signal by a spreading factor matching the spreading factor utilized to spread the data signal. The remote terminal and base terminal can dynamically vary the matching spreading factors to adjust the data rate based on an estimation of operating quality over time between the remote terminal and base terminal such that the amount of data being transmitted is substantially maximized while providing a specified quality of service.

  1. Laboratory testing of a displacement ventilation diffuser for underfloor air distribution systems

    E-Print Network [OSTI]

    Raftery, Paul; Bauman, Fred; Schiavon, Stefano; Epp, Tom

    2015-01-01

    decay in underfloor air distribution (UFAD) systems: for an under floor air distribution system, Energy and of an underfloor air distribution system, Journal of Fluid 

  2. Energy-Efficient Surveillance System Using Wireless Sensor Networks

    E-Print Network [OSTI]

    Stankovic, John A.

    Energy-Efficient Surveillance System Using Wireless Sensor Networks Tian He, Sudha Krishnamurthy networks, is of great prac- tical importance for the military. Because of the energy constraints of sensor devices, such systems necessitate an energy-aware design to ensure the longevity of surveillance missions

  3. Energy-Efficient Adaptive MIMO Systems Leveraging Dynamic Spare Capacity

    E-Print Network [OSTI]

    de Veciana, Gustavo

    Energy-Efficient Adaptive MIMO Systems Leveraging Dynamic Spare Capacity Hongseok Kim, Chan, energy conservation, spare capacity I. INTRODUCTION Wireless cellular systems such as WiMAX are evolving capacity, it is achieved in most cases at the expense of much higher energy consumption resulting

  4. Energy performance of underfloor air distribution systems

    E-Print Network [OSTI]

    Bauman, Fred; Webster, Tom; Linden, Paul; Buhl, Fred

    2007-01-01

    distribution: Thermal  stratification. ” ASHRAE Journal, M.  Shi.  2002b.  “Thermal stratification performance of controlled/optimized thermal stratification is critical  to 

  5. RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS

    E-Print Network [OSTI]

    Kahn, E.

    2011-01-01

    and deal only with solar cogeneration units that are assumedand Distributed. cogeneration). These provide just underparameters. as conventional cogeneration units. technologies

  6. Optimal Dispatch of Photovoltaic Inverters in Residential Distribution Systems

    E-Print Network [OSTI]

    Giannakis, Georgios

    Optimal Dispatch of Photovoltaic Inverters in Residential Distribution Systems Emiliano Dall. The increased penetration of roof-top photovoltaic (PV) systems has highlighted pressing needs to address power--Distribution networks, inverter control, optimal power flow (OPF), photovoltaic (PV) systems, sparsity, voltage

  7. Formal Development and Verification of a Distributed Railway Control System

    E-Print Network [OSTI]

    Peleska, Jan - Fachbereich 3

    Formal Development and Verification of a Distributed Railway Control System Anne E. Haxthausen 1@informatik.uni­bremen.de Abstract. In this article we introduce the concept for a distributed rail­ way control system and present the sys­ tem model into a domain model describing the physical system in absence of control

  8. Distributed Control of Networked Dynamical Systems: Static Feedback,

    E-Print Network [OSTI]

    Dimarogonas, Dimos

    1 Distributed Control of Networked Dynamical Systems: Static Feedback, Integral Action--This paper analyzes distributed control protocols for first- and second-order networked dynamical systems. We systems. The PI controllers successfully attenuate constant disturbances in the network. We prove

  9. A Smart Energy System with Distributed Access Control

    E-Print Network [OSTI]

    Shinozuka, Masanobu

    A Smart Energy System with Distributed Access Control Cheng-Ting Lee, Cheng-Hsun Yang, Chun.chou}@gmail.com Abstract--This paper presents a new smart energy (SE) system with distributed access control. Many other SE with minimal power, latency, and cost overhead. I. INTRODUCTION Smart energy (SE) systems have been one

  10. DISTRIBUTED DATABASE SYSTEMS M. Tamer zsu

    E-Print Network [OSTI]

    Özsu, M. Tamer

    a database that is distributed across the nodes of a computer network and makes this distribution transparent of consistent and atomic execution against the database. Transparency: Extension of data independence at every site where it executes. The name comes from the fact that two rounds of messages are exchanged

  11. Effects of Home Energy Management Systems on Distribution Utilities...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Effects of Home Energy Management Systems on Distribution Utilities and Feeders under Various Market Structures Preprint Mark Ruth, Annabelle Pratt, Monte Lunacek, Saurabh Mittal,...

  12. Distributed Generation Study/Patterson Farms CHP System Using...

    Open Energy Info (EERE)

    Patterson Farms CHP System Using Renewable Biogas < Distributed Generation Study Jump to: navigation, search Study Location Auburn, New York Site Description Agricultural Study...

  13. Sensor Networks for Monitoring and Control of Water Distribution Systems

    E-Print Network [OSTI]

    Whittle, Andrew

    Water distribution systems present a significant challenge for structural monitoring. They comprise a complex network of pipelines buried underground that are relatively inaccessible. Maintaining the integrity of these ...

  14. Quantum Hacking: Experimental demonstration of time-shift attack against practical quantum key distribution systems

    E-Print Network [OSTI]

    Yi Zhao; Chi-Hang Fred Fung; Bing Qi; Christine Chen; Hoi-Kwong Lo

    2011-04-01

    Quantum key distribution (QKD) systems can send signals over more than 100 km standard optical fiber and are widely believed to be secure. Here, we show experimentally for the first time a technologically feasible attack, namely the time-shift attack, against a commercial QKD system. Our result shows that, contrary to popular belief, an eavesdropper, Eve, has a non-negligible probability (~4%) to break the security of the system. Eve's success is due to the well-known detection efficiency loophole in the experimental testing of Bell inequalities. Therefore, the detection efficiency loophole plays a key role not only in fundamental physics, but also in technological applications such as QKD.

  15. Analysis of space heating and domestic hot water systems for energy-efficient residential buildings

    SciTech Connect (OSTI)

    Dennehy, G

    1983-04-01

    An analysis of the best ways of meeting the space heating and domestic hot water (DHW) needs of new energy-efficient houses with very low requirements for space heat is provided. The DHW load is about equal to the space heating load in such houses in northern climates. The equipment options which should be considered are discussed, including new equipment recently introduced in the market. It is concluded that the first consideration in selecting systems for energy-efficient houses should be identification of the air moving needs of the house for heat distribution, heat storage, ventilation, and ventilative cooling. This is followed, in order, by selection of the most appropriate distribution system, the heating appliances and controls, and the preferred energy source, gas, oil, or electricity.

  16. Century Electric Distribution System Operations Lorenzo Kristov,1

    E-Print Network [OSTI]

    any point on the system and from any one of dozens of different types of distributed energy resources of Renewable and Distributed Energy Resources, Caltech Resnick Institute, 2012 #12;May 2014 2 and wholesale adoption of distribution energy technologies. All of this has occurred during a period of increasing

  17. Residential forced-air-distribution system study. Semi-annual report March-September 1982

    SciTech Connect (OSTI)

    Orlando, J.A.; Pettit, V.E.; Gamze, M.G.

    1982-11-01

    Tracer gas techniques have frequently been used to determine the air change characteristics for various structures. Previously, GKCO had utilized a tracer gas procedure to measure intrastructural air flows as a basis for computing the heat loss due to forced air distribution systems. Testing of several gas furnace hot air systems indicated that distribution losses can be significant and were affected by the characteristics of the heat source. In a subsequent study, the field testing was expanded to other heating system components including an electric heat pump, a gas heat pump, and a gas furnace/electric heat pump hybrid system. In addition, cooling mode data were taken as a basis for an annual analysis of distribution system efficiency. The report describes the detailed instrumentation of a single test home with a tracer gas and with flowmeters and temperature sensors installed in the duct system, the calibration of these flowmeters, and two alternative analyses of the resulting data. It also includes results from data collection in two additional structures - a two story structure with the duct system located in the basement and attic, and a one story rambler with a radial duct system buried in the building slab. Distribution system efficiencies ranged from 66% to over 74%.

  18. RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS

    E-Print Network [OSTI]

    Kahn, E.

    2011-01-01

    Edward, Reliability of Wind Power from Dispersed Sites:The same is true for wind power. This Even over hundreds ofof (11) also shows how wind power output distributi.on

  19. Energy Efficient HVAC System for Distributed Cooling/Heating with

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum12, 2015 Infographic courtesyEducation Data JamDepartment ofEEREPrecipitator

  20. Fuzzy logic based operated device identification in power distribution systems 

    E-Print Network [OSTI]

    Manivannan, Karthick Muthu

    2002-01-01

    Fault location in distribution systems is a challenging task because of the lack of homogeneity in the system and due to uncertainity in the data used for estimating the faulted sections. Fuzzy logic has widely been applied for handling...

  1. On-Site Wastewater Treatment Systems: Subsurface Drip Distribution (Spanish) 

    E-Print Network [OSTI]

    Lesikar, Bruce J.; Enciso, Juan

    1999-08-12

    A subsurface drip system distributes wastewater to the lawn through a system of tubing installed below the ground surface. This publication explains the advantages, disadvantages, maintenance steps and estimated costs of ...

  2. Discovering Statistical Models of Availability in Large Distributed Systems

    E-Print Network [OSTI]

    Kondo, Derrick

    1 Discovering Statistical Models of Availability in Large Distributed Systems: An Empirical Study. Invariably, these systems are composed of heterogeneous hosts whose individual availability often exhibit describe an effective method for discovering subsets of hosts whose availability have similar statistical

  3. Heat Distribution Systems | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    heat arriving in the radiators. As a result, steam systems make it difficult to implement control strategies such as a night setback system. The first central heating systems for...

  4. Dynamic Optimization for Optimal Control of Water Distribution Systems

    E-Print Network [OSTI]

    Ertin, Emre

    Dynamic Optimization for Optimal Control of Water Distribution Systems Emre Ertin, Anthony N. Dean Columbus OH 43201 ABSTRACT In this paper we consider the design of intelligent control policies for water as a controller for a water distribution system. In the example presented we obtain a 12.5 percent reduction

  5. STOCHASTIC CONTROL FOR DISTRIBUTED SYSTEMS WITH APPLICATIONS TO WIRELESS

    E-Print Network [OSTI]

    Huang, Minyi

    STOCHASTIC CONTROL FOR DISTRIBUTED SYSTEMS WITH APPLICATIONS TO WIRELESS COMMUNICATIONS Minyi Huang Departement of Electrical and Computer Engineering McGill University, Montr´eal June 2003 A Thesis submitted and optimization of distributed stochastic systems motivated by current wireless applications. In wireless

  6. Process Migration for Heterogeneous Distributed Systems Matt Bishop

    E-Print Network [OSTI]

    Process Migration for Heterogeneous Distributed Systems Matt Bishop Department of Computer Science and mechanisms for migrating processes in a distributed system become more complicated in a heterogeneous the means to migrate processes to the idle resources. In this paper, we present a graph model for single

  7. On Correlated Availability in Internet-Distributed Systems Derrick Kondo

    E-Print Network [OSTI]

    Kondo, Derrick

    On Correlated Availability in Internet-Distributed Systems Derrick Kondo INRIA, France dkondo measure and characterize the time dynamics of availability in a large-scale Internet- distributed system with over 110,000 hosts. Our char- acterization focuses on identifying patterns of corre- lated availability

  8. Analysis Model for Domestic Hot Water Distribution Systems: Preprint

    SciTech Connect (OSTI)

    Maguire, J.; Krarti, M.; Fang, X.

    2011-11-01

    A thermal model was developed to estimate the energy losses from prototypical domestic hot water (DHW) distribution systems for homes. The developed model, using the TRNSYS simulation software, allows researchers and designers to better evaluate the performance of hot water distribution systems in homes. Modeling results were compared with past experimental study results and showed good agreement.

  9. Energy Efficiency Maximization of Practical Wireless Communication Systems

    E-Print Network [OSTI]

    ERASLAN, EREN

    2013-01-01

    Energy Efficiency MaximizationLow-Complexity Link Adaptation for Energy Efficiency Max-Energy Efficiency and Transmit Power

  10. Implementation and Rejection of Industrial Steam System Energy Efficiency Measures

    E-Print Network [OSTI]

    Therkelesen, Peter

    2014-01-01

    Energy  Use   and  Energy  Efficiency  Improvement  Summer   Study  on  Energy  Efficiency  in  Industry.  Summer  Study  on  Energy  Efficiency  in  Industry.  

  11. Energy-Efficient Resource Allocation for Multiband UWB Communication Systems

    E-Print Network [OSTI]

    Liu, K. J. Ray

    Energy-Efficient Resource Allocation for Multiband UWB Communication Systems W. Pam Siriwongpairat, Zhu Han, and K. J. Ray Liu, Department of Electrical and Computer Engineering and Institute of power consumption under the constraints on the packet error rate, transmission rate, and FCC regulations

  12. Improved Combustion Efficiencies - Control Systems for Process Heaters and Boilers 

    E-Print Network [OSTI]

    Varma, A. C.; Prengle, H. W.

    1979-01-01

    % O 2 ) by using high efficiency low excess air burners. 3. Installing modern combustion control systems for automatic control of proper air/fuel ratio to optimize heater combustion. 4. Reducing radiation losses from the furnace to about 1... fuels. CONVENTIONAL HEATER CONTROLS A conventional control system is defined as the minimum control instrumentation necessary, as illustra ted by Figure 3. The feed outlet temperature controller provides the set point for the burner fuel pressure...

  13. DISTRIBUTED ENERGY SYSTEMS IN CALIFORNIA'S FUTURE: A PRELIMINARY REPORT, VOLUME I

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01

    of various distributed and renewable energy systems forto operate on renewable, largely distributed energy systems,distributed and largely renewable resources and from non-renewable energy

  14. Energy Efficient Design, Retrofit and Control of Evaporative Condensers in Ammonia Refrigeration Systems

    E-Print Network [OSTI]

    Kissock, Kelly

    Energy Efficient Design, Retrofit and Control of Evaporative Condensers in Ammonia Refrigeration ABSTRACT Ammonia refrigeration systems typically offer many energy efficiency opportunities because efficiency of ammonia refrigeration systems. Introduction About 7.5% of the total manufacturing energy

  15. An analysis of distributed solar fuel systems

    E-Print Network [OSTI]

    Thomas, Alex, S.M. Massachusetts Institute of Technology

    2012-01-01

    While solar fuel systems offer tremendous potential to address global clean energy needs, most existing analyses have focused on the feasibility of large centralized systems and applications. Not much research exists on ...

  16. Distributed naming in a factored operating system

    E-Print Network [OSTI]

    Beckmann, Nathan (Nathan Zachary)

    2010-01-01

    A factored operating system (fos) is a new operating system design for manycore and cloud computers. In fos, OS services are separated from application code and run on distinct cores. Furthermore, each service is split ...

  17. Reliable Distributed Computing for Decision Support Systems

    E-Print Network [OSTI]

    Bargiela, Andrzej

    of pipes and network nodes spread over a large geographical area, calls for a control of computational system it is serv- icing. Addressing the reliability issues of dis- tributed systems involves tackling

  18. Energy Savings From System Efficiency Improvements in Iowa’s HVAC SAVE Program

    SciTech Connect (OSTI)

    Yee, S.; Baker, J.; Brand, L.; Wells, J.

    2013-08-01

    The objective of this project is to explore the energy savings potential of maximizing furnace and distribution system performance by adjusting operating, installation, and distribution conditions. The goal of the Iowa HVAC System Adjusted and Verified Efficiency (SAVE) program is to train contractors to measure installed system efficiency as a diagnostic tool to ensure that the homeowner achieves the energy reduction target for the home rather than simply performing a tune-up on the furnace or having a replacement furnace added to a leaky system. The PARR research team first examined baseline energy usage from a sample of 48 existing homes, before any repairs or adjustments were made, to calculate an average energy savings potential and to determine which system deficiencies were prevalent. The results of the baseline study of these homes found that, on average, about 10% of the space heating energy available from the furnace was not reaching the conditioned space. In the second part of the project, the team examined a sample of 10 homes that had completed the initial evaluation for more in-depth study. For these homes, the diagnostic data shows that it is possible to deliver up to 23% more energy from the furnace to the conditioned space by doing system tune ups with or without upgrading the furnace. Replacing the furnace provides additional energy reduction. The results support the author's belief that residential heating and cooling equipment should be tested and improved as a system rather than a collection of individual components.

  19. Physicomimetics Positioning Methodology for Distributed Autonomous Systems

    E-Print Network [OSTI]

    widely in type, as well as size, e.g., from nanobots or micro-electromechanical systems (MEMS) to micro

  20. An efficient finite element method applied to quantum billiard systems

    E-Print Network [OSTI]

    Woo-Sik Son; Sunghwan Rim; Chil-Min Kim

    2009-02-25

    An efficient finite element method (FEM) for calculating eigenvalues and eigenfunctions of quantum billiard systems is presented. We consider the FEM based on triangular $C_1$ continuity quartic interpolation. Various shapes of quantum billiards including an integrable unit circle are treated. The numerical results show that the applied method provides accurate set of eigenvalues exceeding a thousand levels for any shape of quantum billiards on a personal computer. Comparison with the results from the FEM based on well-known $C_0$ continuity quadratic interpolation proves the efficiency of the method.

  1. Minimizing Energy Consumption in a Water Distribution System: A Systems Modeling Approach 

    E-Print Network [OSTI]

    Johnston, John

    2011-08-08

    In a water distribution system from groundwater supply, the bulk of energy consumption is expended at pump stations. These pumps pressurize the water and transport it from the aquifer to the distribution system and to elevated storage tanks. Each...

  2. Biological optimization systems for enhancing photosynthetic efficiency and methods of use

    DOE Patents [OSTI]

    Hunt, Ryan W; Chinnasamy, Senthil; Das, Keshav C; Rolim de Mattos, Erico

    2014-02-25

    The present disclosure relates to biological optimization systems for enhancing photosynthetic efficiency and methods of use.

  3. Klystron 'efficiency loop' for the ALS storage ring RF system

    SciTech Connect (OSTI)

    Kwiatkowski, Slawomir; Julian, Jim; Baptiste, Kenneth

    2002-05-20

    The recent energy crisis in California has led us to investigate the high power RF systems at the Advanced Light Source (ALS) in order to decrease the energy consumption and power costs. We found the Storage Ring Klystron Power Amplifier system operating as designed but with significant power waste. A simple proportional-integrator (PI) analog loop, which controls the klystron collector beam current, as a function of the output RF power, has been designed and installed. The design considerations, besides efficiency improvement, were to interface to the existing system without major expense. They were to also avoid the klystron cathode power supply filter's resonance in the loop's dynamics, and prevent a conflict with the existing Cavity RF Amplitude Loop dynamics. This efficiency loop will allow us to save up to 700 MW-hours of electrical energy per year and increase the lifetime of the klystron.

  4. Energy-Efficient Building HVAC Control Using Hybrid System LBMPC

    E-Print Network [OSTI]

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

    2012-01-01

    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...

  5. RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS

    E-Print Network [OSTI]

    Kahn, E.

    2011-01-01

    applied to the case of hydroelectric facilities with large3. For comparison, the hydroelectric system in California asas droughts which reduce hydroelectric energy availability,

  6. Implementation and Rejection of Industrial Steam System Energy Efficiency Measures

    SciTech Connect (OSTI)

    Therkelesen, Peter; McKane, Aimee

    2013-05-01

    Steam systems consume approximately one third of energy applied at U.S. industrial facilities. To reduce energy consumption, steam system energy assessments have been conducted on a wide range of industry types over the course of five years through the Energy Savings Assessment (ESA) program administered by the U.S. Department of Energy (U.S. DOE). ESA energy assessments result in energy efficiency measure recommendations that are given potential energy and energy cost savings and potential implementation cost values. Saving and cost metrics that measure the impact recommended measures will have at facilities, described as percentages of facility baseline energy and energy cost, are developed from ESA data and used in analyses. Developed savings and cost metrics are examined along with implementation and rejection rates of recommended steam system energy efficiency measures. Based on analyses, implementation of steam system energy efficiency measures is driven primarily by cost metrics: payback period and measure implementation cost as a percentage of facility baseline energy cost (implementation cost percentage). Stated reasons for rejecting recommended measures are primarily based upon economic concerns. Additionally, implementation rates of measures are not only functions of savings and cost metrics, but time as well.

  7. Integrated Distribution Management System for Alabama Principal Investigator

    SciTech Connect (OSTI)

    Schatz, Joe

    2013-03-31

    Southern Company Services, under contract with the Department of Energy, along with Alabama Power, Alstom Grid (formerly AREVA T&D) and others moved the work product developed in the first phase of the Integrated Distribution Management System (IDMS) from “Proof of Concept” to true deployment through the activity described in this Final Report. This Project – Integrated Distribution Management Systems in Alabama – advanced earlier developed proof of concept activities into actual implementation and furthermore completed additional requirements to fully realize the benefits of an IDMS. These tasks include development and implementation of a Distribution System based Model that enables data access and enterprise application integration.

  8. Automated Fault Location In Smart Distribution Systems 

    E-Print Network [OSTI]

    Lotfifard, Saeed

    2012-10-19

    of Energy (DOE) “Grid 2030” initiatives for grid modernization by improving reliability indices of the network. Improving customer average interruption duration index (CAIDI) and system average interruption duration index (SAIDI) are direct advantages...

  9. RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS

    E-Print Network [OSTI]

    Kahn, E.

    2011-01-01

    wind speed of generator v r = rated P r rated power of generator.power systems dominated by either conventional central station plants or wind generatorspower plants (coal or nuclear) in one case, and by wind generators

  10. Modeling of underfloor air distribution (UFAD) systems.

    E-Print Network [OSTI]

    Webster, Tom; Bauman, Fred; Buhl, Fred; Daly, Allan

    2008-01-01

    P. Linden, 2008. “The EnergyPlus UFAD Module. ” ProceedingsProject: Special Version of EnergyPlus for York Test RoomSystems using the EnergyPlus Simulation Software. ” Master’s

  11. Dynamic Interactions of PV units in Low Volatge Distribution Systems

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    Dynamic Interactions of PV units in Low Volatge Distribution Systems M. J. Hossain, J. Lu Griffith. Abstract--Photovoltaic (PV) units along with other distributed energy resources (DERs) are located close, robust control, stability. I. Introduction The integration level of PV units in low and medium voltage

  12. A Smart Energy System: Distributed Resource Management, Control and Optimization

    E-Print Network [OSTI]

    Beigl, Michael

    A Smart Energy System: Distributed Resource Management, Control and Optimization Yong Ding, Student of distributed energy resource and consumption management, which proposes to design a networked and embedded platform for realizing a dynamic energy mix and optimizing the energy consumption dy- namically. Based

  13. Ontology based chaining of distributed Geographic Information Systems Rob Lemmens

    E-Print Network [OSTI]

    Ontology based chaining of distributed Geographic Information Systems Rob Lemmens Department of Geo-information AA Enschede, The Netherlands e-mail: lemmens@itc.nl 1. Geographic Information Systems as com- ponents For the last decade, Geographic Information Systems (GIS) have provided planners and geo scientists with tools

  14. Incentivizing Efficiency in Societal-Scale Cyber-Physical Systems

    E-Print Network [OSTI]

    Ratliff, Lillian Jane

    2015-01-01

    1.2 Efficiency–Vulnerability Tradeoff in Societal–Scaleand M. A. Satterthwaite. “Efficient mechanisms for bilateralgame for building energy efficiency: Incentive design”. In:

  15. Energy Efficiency Maximization of Practical Wireless Communication Systems

    E-Print Network [OSTI]

    ERASLAN, EREN

    2013-01-01

    of Energy Efficiency in Modern Wireless CommunicationLi, “A survey of energy-efficient wireless communications,”optimization for energy- efficient wireless communications:

  16. Modeling the Effect of Hurricanes on Power Distribution Systems 

    E-Print Network [OSTI]

    Chanda, Suraj

    2012-10-19

    outages and excessive delays in the reconstruction efforts. Accordingly, predicting the effects of power outages on the performance of power distribution systems is of major importance to government agencies, utilities, and customers. Unfortunately...

  17. Heat transfer pathways in underfloor air distribution (UFAD) systems

    E-Print Network [OSTI]

    Bauman, F.; Jin, H.; Webster, T.

    2006-01-01

    air distribution: Thermal stratification. ASHRAE Journalstratification is increased and temperatures near the ceiling rise, this condition aggra- vates the thermalthermal decay can be a problem. Properly controlled UFAD systems produce temperature stratification

  18. Impact of SolarSmart Subdivisions on SMUD's Distribution System

    SciTech Connect (OSTI)

    McNutt, P.; Hambrick, J.; Keesee, M.; Brown, D.

    2009-07-01

    This study analyzes the distribution impacts of high penetrations of grid-integrated renewable energy systems, specifically photovoltaic (PV) equipped SolarSmart Homes found in the Anatolia III Residential Community.

  19. Reliability Improvement Programs in Steam Distribution and Power Generation Systems 

    E-Print Network [OSTI]

    Petto, S.

    1987-01-01

    can be found in power generation. steam distribution, and in all types of durable and non-durable Industrial productions. I 300 " 0 " 200 C " ? ? ~ 'DO ?~ 50 ' .. '7. '70 '75 '50 '.2 The cost to maintain steam systems. namely...

  20. A distributed boundary detection algorithm for multi-robot systems

    E-Print Network [OSTI]

    McLurkin, James

    We describe a distributed boundary detection algorithm suitable for use on multi-robot systems with dynamic network topologies. We assume that each robot has access to its local network geometry, which is the combination ...

  1. Power-Demand Routing in massive geo-distributed systems

    E-Print Network [OSTI]

    Qureshi, Asfandyar

    2010-01-01

    There is an increasing trend toward massive, geographically distributed systems. The largest Internet companies operate hundreds of thousands of servers in multiple geographic locations, and are growing at a fast clip. A ...

  2. Evaluation of the application uniformity of subsurface drip distribution systems 

    E-Print Network [OSTI]

    Weynand, Vance Leo

    2004-09-30

    The goal of this research was to evaluate the application uniformity of subsurface drip distribution systems and the recovery of emitter flow rates. Emission volume in the field, and laboratory measured flow rates were ...

  3. CPT: An Energy-Efficiency Model for Multi-core Computer Systems

    E-Print Network [OSTI]

    Shi, Weisong

    CPT: An Energy-Efficiency Model for Multi-core Computer Systems Weisong Shi, Shinan Wang and Bing efficiency of computer systems. These techniques affect the energy efficiency across different layers metric that represents the energy efficiency of a computer system, for a specific configuration, given

  4. An Energy-Efficient Framework for Large-Scale Parallel Storage Systems

    E-Print Network [OSTI]

    Qin, Xiao

    An Energy-Efficient Framework for Large-Scale Parallel Storage Systems Ziliang Zong, Matt Briggs-scale and energy-efficient parallel storage systems. To validate the efficiency of the proposed framework, a buffer that this new framework can significantly improves the energy efficiency of large-scale parallel storage systems

  5. Enabling Broad Adoption of Distributed PV-storage systems Via Supervisory Planning & Control

    E-Print Network [OSTI]

    DeForest, Nicholas

    2014-01-01

    of distributed PV-storage systems via supervisory planning &of distributed PV-storage systems via supervisory planning &control for PV-storage systems increases the annual energy

  6. A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations 

    E-Print Network [OSTI]

    Ituzaro, Fred Agyekum

    2012-07-16

    Smart radial distribution grids will include advanced metering infrastructure (AMI) and significant distributed generators (DGs) connected close to loads. DGs in these radial distribution systems (RDS) introduce bidirectional power flows (BPFs...

  7. Photovoltaic Systems Interconnected onto Secondary Network Distribution Systems – Success Stories

    Broader source: Energy.gov [DOE]

    This report examines six case studies of photovoltaic (PV) systems integrated into secondary network systems. The six PV systems were chosen for evaluation because they are interconnected to secondary network systems located in four major Solar America Cities.

  8. Distributed Runtime Verification of JADE Multiagent Systems

    E-Print Network [OSTI]

    Mascardi, Viviana

    to a given global protocol is of paramount importance for most systems, and is mandatory for safety-critical of the verification activities. Reducing the log files dimension, re-implementing the monitor in a way independent in the JADE Homepage. FYPA (Find Your Path, Agent! [6, 7, 8]) is another industrial MAS developed in JADE

  9. Parallel and Distributed Systems Speaker: Dick Epema

    E-Print Network [OSTI]

    Kuzmanov, Georgi

    systems Online Social Netw. #12;3 M.Sc. Thesis Projects: The Supervision · We help you excel, without is international · We often organize the top international conferences in our field #12;4 M.Sc. Thesis Projects concepts and show that they work · For examples of previous MSc projects see the theses on the PDS website

  10. Distributionally robust control of constrained stochastic systems

    E-Print Network [OSTI]

    2013-05-01

    The proposed methods are illustrated for a wind turbine blade control design case .... function L, the severity of constraint violation in the ? percent of the worst cases ..... When choosing a control policy for the system S, we will require that it be ... as (16), even for convex loss functions L, seem hard to deal with directly when.

  11. Exergy Analysis of the Cryogenic Helium Distribution System for the Large Hadron Collider (LHC)

    E-Print Network [OSTI]

    Claudet, S; Tavian, L; Wagner, U; 10.1063/1.3422294

    2010-01-01

    The Large Hadron Collider (LHC) at CERN features the world’s largest helium cryogenic system, spreading over the 26.7 km circumference of the superconducting accelerator. With a total equivalent capacity of 145 kW at 4.5 K including 18 kW at 1.8 K, the LHC refrigerators produce an unprecedented exergetic load, which must be distributed efficiently to the magnets in the tunnel over the 3.3 km length of each of the eight independent sectors of the machine. We recall the main features of the LHC cryogenic helium distribution system at different temperature levels and present its exergy analysis, thus enabling to qualify second-principle efficiency and identify main remaining sources of irreversibility..

  12. Assessing the Energy Efficiency Potential of Industrial Motor Systems

    E-Print Network [OSTI]

    McKane, Aimee

    2014-01-01

    variable speed drive Replace pump with more energy efficient type Replace motor with more energy efficient type Initiate predictive maintenance

  13. A Better Steam Engine: Designing a Distributed Concentrating Solar Combined Heat and Power System

    E-Print Network [OSTI]

    Norwood, Zachary Mills

    2011-01-01

    solar-electric system (typical for thin-film panels currently) plus a 58% efficient solar-thermal system (flat-plate efficiency

  14. Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems

    E-Print Network [OSTI]

    Ho, Tony

    2012-01-01

    the solar power tower, the solar efficiency of the system isThe product of the solar efficiency and the power blockFig. 6.6 shows the solar efficiency, maximum power block

  15. System and method to determine electric motor efficiency nonintrusively

    DOE Patents [OSTI]

    Lu, Bin (Kenosha, WI); Habetler, Thomas G. (Snellville, GA); Harley, Ronald G. (Lawrenceville, GA)

    2011-08-30

    A system and method for nonintrusively determining electric motor efficiency includes a processor programed to, while the motor is in operation, determine a plurality of stator input currents, electrical input data, a rotor speed, a value of stator resistance, and an efficiency of the motor based on the determined rotor speed, the value of stator resistance, the plurality of stator input currents, and the electrical input data. The determination of the rotor speed is based on one of the input power and the plurality of stator input currents. The determination of the value of the stator resistance is based on at least one of a horsepower rating and a combination of the plurality of stator input currents and the electrical input data. The electrical input data includes at least one of an input power and a plurality of stator input voltages.

  16. Distributed Generation Systems Inc | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoopButtePower VenturesInformation9)ask queriesWind FarmAreaDiscussionSystems

  17. Nanocoatings for High-Efficiency Industrial Hydraulic and Tooling Systems

    SciTech Connect (OSTI)

    Clifton B. Higdon III

    2011-01-07

    Industrial manufacturing in the U.S. accounts for roughly one third of the 98 quadrillion Btu total energy consumption. Motor system losses amount to 1.3 quadrillion Btu, which represents the largest proportional loss of any end-use category, while pumps alone represent over 574 trillion BTU (TBTU) of energy loss each year. The efficiency of machines with moving components is a function of the amount of energy lost to heat because of friction between contacting surfaces. The friction between these interfaces also contributes to downtime and the loss of productivity through component wear and subsequent repair. The production of new replacement parts requires additional energy. Among efforts to reduce energy losses, wear-resistant, low-friction coatings on rotating and sliding components offer a promising approach that is fully compatible with existing equipment and processes. In addition to lubrication, one of the most desirable solutions is to apply a protective coating or surface treatment to rotating or sliding components to reduce their friction coefficients, thereby leading to reduced wear. Historically, a number of materials such as diamond-like carbon (DLC), titanium nitride (TiN), titanium aluminum nitride (TiAlN), and tungsten carbide (WC) have been examined as tribological coatings. The primary objective of this project was the development of a variety of thin film nanocoatings, derived from the AlMgB14 system, with a focus on reducing wear and friction in both industrial hydraulics and cutting tool applications. Proof-of-concept studies leading up to this project had shown that the constituent phases, AlMgB14 and TiB2, were capable of producing low-friction coatings by pulsed laser deposition. These coatings combine high hardness with a low friction coefficient, and were shown to substantially reduce wear in laboratory tribology tests. Selection of the two applications was based largely on the concept of improved mechanical interface efficiencies for energy conservation. In mobile hydraulic systems, efficiency gains through low friction would translate into improved fuel economy and fewer greenhouse gas emissions. Stationary hydraulic systems, accordingly, would consume less electrical power. Reduced tooling wear in machining operations would translate to greater operating yields, while lowering the energy consumed during processing. The AlMgB14 nanocoatings technology progressed beyond baseline laboratory tests into measurable energy savings and enhancements to product durability. Three key hydraulic markets were identified over the course of the project that will benefit from implementation: industrial vane pumps, orbiting valve-in-star hydraulic motors, and variable displacement piston pumps. In the vane pump application, the overall product efficiency was improved by as much as 11%. Similar results were observed with the hydraulic motors tested, where efficiency gains of over 10% were noted. For variable displacement piston pumps, overall efficiency was improved by 5%. For cutting tools, the most significant gains in productivity (and, accordingly, the efficiency of the machining process as a whole) were associated with the roughing and finishing of titanium components for aerospace systems. Use of the AlMgB14 nanocoating in customer field tests has shown that the coated tools were able to withstand machining rates as high as 500sfm (limited only by the substrate material), with relatively low flank wear when compared to other industrial offerings. AlMgB14 coated tools exhibited a 60% improvement over similarly applied TiAlN thin films. Furthermore, AlMgB14-based coatings in these particular tests lasted twice as long than their TiAlN counterparts at the 500sfm feed rates. Full implementation of the technology into the industrial hydraulic and cutting tool markets equates to a worldwide energy savings of 46 trillion BTU/year by 2030. U.S.-based GHG emissions associated with the markets identified would fall accordingly, dropping by as much as 50,000 tonnes annually.

  18. DISTRIBUTED ENERGY SYSTEMS IN CALIFORNIA'S FUTURE: A PRELIMINARY REPORT, VOLUME I

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01

    DOCU[viENTS SECTION DISTRIBUTED ENERGY SYSTEMS STUDY GROUPIMPLICATIONS OF UTILIZING DISTRIBUTED ENERGY TECHNOLOGIES .to implement a distributed energy future. RECENT TRENDS IN

  19. Optimal Combination of Distributed Energy System in an Eco-Campusof Japan

    SciTech Connect (OSTI)

    Yang, Yongwen; Gao, Weijun; Zhou, Nan; Marnay, Chris

    2006-06-14

    In this study, referring to the Distributed Energy Resources Customer Adoption Model (DER-CAM) which was developed by the Ernest Orlando Lawrence Berkeley National Laboratory (LBNL), E-GAMS programmer is developed with a research of database of energy tariffs, DER (Distributed Energy Resources) technology cost and performance characteristics, and building energy consumption in Japan. E-GAMS is a tool designed to find the optimal combination of installed equipment and an idealized operating schedule to minimize a site's energy bills. In this research, by using E-GAMS, we present a tool to select the optimal combination of distributed energy system for an Ecological-Campus, Kitakyushu, Science and Research Park (KSRP). We discuss the effects of the combination of distributed energy technologies on the energy saving, economic efficiency and environmental benefits.

  20. Efficient estimation of resonant coupling between quantum systems

    E-Print Network [OSTI]

    Markku P. V. Stenberg; Yuval R. Sanders; Frank K. Wilhelm

    2014-11-04

    We present an efficient method for the characterization of two coupled discrete quantum systems, one of which can be controlled and measured. For two systems with transition frequencies $\\omega_q$, $\\omega_r$, and coupling strength $g$ we show how to obtain estimates of $g$ and $\\omega_r$ whose error decreases exponentially in the number of measurement shots rather than as a power law expected in simple approaches. Our algorithm can thereby identify $g$ and $\\omega_r$ simultaneously with high precision in a few hundred measurement shots. This is achieved by adapting measurement settings upon data as it is collected. We also introduce a method to eliminate erroneous estimates with small overhead. Our algorithm is robust against the presence of relaxation and typical noise. Our results are applicable to many candidate technologies for quantum computation, in particular, for the characterization of spurious two-level systems in superconducting qubits or stripline resonators.

  1. Low-Cost Hydrogen Distributed Production System Development

    SciTech Connect (OSTI)

    C.E. Thomas, Ph.D., President Franklin D. Lomax, Ph.D, CTO & Principal Investigator, and Maxim Lyubovski, Ph.D.

    2011-03-10

    H{sub 2}Gen, with the support of the Department of Energy, successfully designed, built and field-tested two steam methane reformers with 578 kg/day capacity, which has now become a standard commercial product serving customers in the specialty metals and PV manufacturing businesses. We demonstrated that this reformer/PSA system, when combined with compression, storage and dispensing (CSD) equipment could produce hydrogen that is already cost-competitive with gasoline per mile driven in a conventional (non-hybrid) vehicle. We further showed that mass producing this 578 kg/day system in quantities of just 100 units would reduce hydrogen cost per mile approximately 13% below the cost of untaxed gasoline per mile used in a hybrid electric vehicle. If mass produced in quantities of 500 units, hydrogen cost per mile in a FCEV would be 20% below the cost of untaxed gasoline in an HEV in the 2015-2020 time period using EIA fuel cost projections for natural gas and untaxed gasoline, and 45% below the cost of untaxed gasoline in a conventional car. This 20% to 45% reduction in fuel cost per mile would accrue even though hydrogen from this 578 kg/day system would cost approximately $4.14/kg, well above the DOE hydrogen cost targets of $2.50/kg by 2010 and $2.00/kg by 2015. We also estimated the cost of a larger, 1,500 kg/day SMR/PSA fueling system based on engineering cost scaling factors derived from the two H{sub 2}Gen products, a commercial 115 kg/day system and the 578 kg/day system developed under this DOE contract. This proposed system could support 200 to 250 cars per day, similar to a medium gasoline station. We estimate that the cost per mile from this larger 1,500 kg/day hydrogen fueling system would be 26% to 40% below the cost per mile of untaxed gasoline in an HEV and ICV respectively, even without any mass production cost reductions. In quantities of 500 units, we are projecting per mile cost reductions between 45% (vs. HEVs) and 62% (vs ICVs), with hydrogen costing approximately $2.87/kg, still above the DOE's 2010 $2.50/kg target. We also began laboratory testing of reforming ethanol, which we showed is currently the least expensive approach to making renewable hydrogen. Extended testing of neat ethanol in micro-reactors was successful, and we also were able to reform E-85 acquired from a local fueling station for 2,700 hours, although some modifications were required to handle the 15% gasoline present in E-85. We began initial tests of a catalyst-coated wall reformer tube that showed some promise in reducing the propensity to coke with E-85. These coated-wall tests ran for 350 hours. Additional resources would be required to commercialize an ethanol reformer operating on E-85, but there is no market for such a product at this time, so this ethanol reformer project was moth-balled pending future government or industry support. The two main objectives of this project were: (1) to design, build and test a steam methane reformer and pressure swing adsorption system that, if scaled up and mass produced, could potentially meet the DOE 2015 cost and efficiency targets for on-site distributed hydrogen generation, and (2) to demonstrate the efficacy of a low-cost renewable hydrogen generation system based on reforming ethanol to hydrogen at the fueling station.

  2. A Methodology and Tool Support for the Design and Evaluation of Fault Tolerant, Distributed Embedded Systems

    E-Print Network [OSTI]

    McKelvin, Jr., Mark Lee

    2011-01-01

    Complexity of Embedded Systems . . . . . . . . . . . . . . .Fault Tolerant Design of Distributed Embedded Systems DesignMethodologies for Embedded Systems . . . . . . . . . . . .

  3. Highperformance Monitoring Architecture for Largescale Distributed Systems Using Event Filtering

    E-Print Network [OSTI]

    Wang, Yongge

    environment. So the monitoring architecture is not only to detect and collect events generated by LSD systemsHigh­performance Monitoring Architecture for Large­scale Distributed Systems Using Event Filtering Monitoring is an essential process to observe and improve the reliability and the performance of large

  4. Index to Evaluate Energy Efficiency of the Building HVAC System 

    E-Print Network [OSTI]

    Wang, L.; Wang, L.; Claridge,D.

    2014-01-01

    Efficiency of the Entire Building HVAC System Presented by Dr. Claridge Date: 09/15/2014 ESL-IC-14-09-15 Proceedings of the 14th International Conference for Enhanced Building Operations, Beijing, China, September 14-17, 2014 2Outline •Why we need the Energy.../Load Ratio •How to get the Energy/Load Ratio •Methodology Adjustment •Case Study •Results Showed by tables and Plots ESL-IC-14-09-15 Proceedings of the 14th International Conference for Enhanced Building Operations, Beijing, China, September 14-17, 2014 3...

  5. Parallel Computing Environments and Methods for Power Distribution System Simulation

    SciTech Connect (OSTI)

    Lu, Ning; Taylor, Zachary T.; Chassin, David P.; Guttromson, Ross T.; Studham, Scott S.

    2005-11-10

    The development of cost-effective high-performance parallel computing on multi-processor super computers makes it attractive to port excessively time consuming simulation software from personal computers (PC) to super computes. The power distribution system simulator (PDSS) takes a bottom-up approach and simulates load at appliance level, where detailed thermal models for appliances are used. This approach works well for a small power distribution system consisting of a few thousand appliances. When the number of appliances increases, the simulation uses up the PC memory and its run time increases to a point where the approach is no longer feasible to model a practical large power distribution system. This paper presents an effort made to port a PC-based power distribution system simulator (PDSS) to a 128-processor shared-memory super computer. The paper offers an overview of the parallel computing environment and a description of the modification made to the PDSS model. The performances of the PDSS running on a standalone PC and on the super computer are compared. Future research direction of utilizing parallel computing in the power distribution system simulation is also addressed.

  6. Agent-Based Simulation of Distribution Systems with High Penetration of Photovoltaic Generation

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    1 Agent-Based Simulation of Distribution Systems with High Penetration of Photovoltaic Generation- tems, photovoltaic generation, power distribution, power system economics, smart grids. I. INTRODUCTION study of electric distribution systems with high penetration of photovoltaic (PV) panels within

  7. Fault Current Issues for Market Driven Power Systems with Distributed Generation

    E-Print Network [OSTI]

    1 Fault Current Issues for Market Driven Power Systems with Distributed Generation Natthaphob of installing distributed generation (DG) to electric power systems. The proliferation of new generators creates Terms--Distributed / dispersed generation, power distri- bution, power system protection, fault

  8. Late Demarshalling: A Technique for Efficient Multi-language Middleware for Embedded Systems

    E-Print Network [OSTI]

    Schirner, Gunar; Harmon, Trevor; Klefstad, Raymond

    2004-01-01

    tributed Real-time and Embedded Systems. IEEE DistributedMiddleware for Embedded Systems The original publication isis problematic for embedded systems, where strict mem- ory

  9. High efficiency switching-mode amplifiers for wireless communication systems

    E-Print Network [OSTI]

    Hung, Tsai-Pi

    2008-01-01

    M. Asbeck, “Design of high-efficiency current-mode class-Dand G. Rabjohn, “A high efficiency Chireix Out- phasingE-A new class of high efficiency tuned single-ended power

  10. Energy Efficiency of large Cryogenic Systems: the LHC Case and Beyond

    E-Print Network [OSTI]

    Claudet, S; Ferlin, G; Lebrun, P; Tavian, L; Wagner, U

    2013-01-01

    Research infrastructures for high-energy and nuclear physics, nuclear fusion and production of high magnetic fields are increasingly based on applied superconductivity and associated cryogenics in their quest for scientific breakthroughs at affordable capital and operation costs, a condition for their acceptance and sustained funding by society. The thermodynamic penalty for operating at low temperature makes energy efficiency a key requirement for their large cryogenic systems, from conceptual design to procurement, construction and operation. Meeting this requirement takes a combined approach on several fronts in parallel: management of heat loads and sizing of cooling duties, distribution of cooling power matching the needs of the superconducting devices, efficient production of refrigeration, optimal control resting on precise instrumentation and diagnostics, as well as a targeted industrial procurement policy. The case of the Large Hadron Collider (LHC) at CERN is presented. Potential improvements for fu...

  11. Energy Efficiency in Heavy Vehicle Tires, Drivetrains, and Braking Systems

    SciTech Connect (OSTI)

    Peter J. Blau

    2000-04-26

    This document was prepared to support the primary goals of the Department of Energy, Office of Heavy Vehicle Technologies. These were recently stated as follows: ''Develop by 2004 the enabling technologies for a class 7-8 truck with a fuel efficiency of 10 mpg (at 65 mph) which will meet prevailing emission standards. For Class 3-6 trucks operating on an urban driving cycle, develop by 2004 commercially viable vehicles that achieve at least double the fuel economy of comparable current vehicles (1999), and as a research goal, reduce criteria pollutants to 30% below EPA standards. Develop by 2004 the diesel engine enabling technologies to support large-scale industry dieselization of Class 1 and 2 trucks, achieving a 35 % fuel efficiency improvement over comparable gasoline-fueled trucks, while meeting applicable emissions standards.'' The enabling technologies for improving the fuel efficiency of trucks, include not only engine technologies but also technologies involved with lowering the rolling resistance of tires, reducing vehicle aerodynamic drag, improving thermal management, and reducing parasitic frictional losses in drive train components. Opportunities also exist for making better use of the energy that might ordinarily be dissipated during vehicle braking. Braking systems must be included in this evaluation since safety in truck operations is vital, and braking requirements are greater for vehicles having lowered resistance to rolling. The Office of Heavy Vehicle Technologies has initiated a program to improve the aerodynamics of heavy vehicles through wind tunnel testing, computational modeling, and on-road evaluations. That activity is described in a separate multi-year plan; therefore, emphasis in this document will be on tires, drive trains, and braking systems. Recent, dramatic fluctuations in diesel fuel prices have emphasized the importance of effecting savings in truck fuel economy by implementing new component designs and materials.

  12. HiFi: A New Monitoring Architecture for Distributed Systems Management Ehab AlShaer Hussein AbdelWahab and Kurt Maly

    E-Print Network [OSTI]

    Wang, Yongge

    , and a programmable environment that facilitates devel­ opment of self­directed monitoring tasks. Increased flexiHiFi: A New Monitoring Architecture for Distributed Systems Management Ehab Al­Shaer Hussein Abdel,maly)@cs.odu.edu Abstract With the increasing complexity of large­scale distributed (LSD) systems, an efficient monitoring

  13. Energy Efficiency Maximization of Practical Wireless Communication Systems

    E-Print Network [OSTI]

    ERASLAN, EREN

    2013-01-01

    left y-axis) and energy efficiency (right y- axis)left y-axis) and energy efficiency (right y-axis) per-

  14. AN ADVANCED STRATEGY FOR ENERGY EFFICIENT LIGHTING INCORPORATING DISTRIBUTED SENSING AND TAILORED CONTROLS

    E-Print Network [OSTI]

    Stanford University

    on Graduate Studies. #12;iv ABSTRACT Improving energy efficiency in buildings is an increasing national

  15. Measured heating system efficiency retrofits in eight manufactured (HUD-code) homes

    SciTech Connect (OSTI)

    Siegel, J.; Davis, B.; Francisco, P.; Palmiter, L.

    1998-07-01

    This report presents the results of field measurements of heating efficiency performed on eight all-electric manufactured homes sited in the Pacific Northwest with forced-air distribution systems. These homes, like more than four million existing manufactured homes in the US, were constructed to thermal specifications that were mandated by the US Department of Housing and Urban Development in 1976. The test protocol compares real-time measurements of furnace energy usage with energy usage during periods when zonal heaters heat the homes to the same internal temperature. By alternating between the furnace and zonal heaters on 2 hour cycles, a short-term coheat test is performed. Additional measurements, including blower door and duct tightness tests, are conducted to measure and characterize the home's tightness and duct leakage so that coheat test results might be linked to other measures of building performance. The testing was done at each home before and after an extensive duct sealing retrofit was performed. The average pre-retrofit system efficiency for these homes was 69%. After the retrofit, the average system efficiency increased to 83%. The average simple payback period for the retrofits ranges from 1 to 5 years in Western Oregon and 1 to 3 years in colder Eastern Oregon.

  16. Manufacturing R&D for systems that will produce and distribute...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    for systems that will produce and distribute hydrogen Manufacturing R&D for systems that will produce and distribute hydrogen Background paper prepared for the 2005 Hydrogen...

  17. Low-Cost Hydrogen-from-Ethanol: A Distributed Production System...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Low-Cost Hydrogen-from-Ethanol: A Distributed Production System (Presentation) Low-Cost Hydrogen-from-Ethanol: A Distributed Production System (Presentation) Presented at the 2007...

  18. An Interview with Professor Alexandra von Meier on an Efficient Electric Grid: Improving Visibility and Integrating Renewable Sources

    E-Print Network [OSTI]

    Chowdhary, Harshika; Gill, Manraj; McGuinness, Philippa; Miller, Daniel; Patel, Saavan

    2015-01-01

    about where is it, how do we convert it efficiently, how dowe transmit it efficiently, and then the big challenge ismaking distribution systems more efficient to improving the

  19. HybridStore: An Efficient Data Management System for Hybrid Flash-Based Sensor Devices

    E-Print Network [OSTI]

    Baras, John S.

    HybridStore: An Efficient Data Management System for Hybrid Flash-Based Sensor Devices Baobing WangStore, a novel efficient resource- aware data management system for flash-based sensor devices to store and query, designing an efficient resource- aware data management system for flash-based sensor devices is a very

  20. Can We Improve Energy Efficiency of Secure Disk Systems without Modifying Security Mechanisms?

    E-Print Network [OSTI]

    Qin, Xiao

    Can We Improve Energy Efficiency of Secure Disk Systems without Modifying Security Mechanisms--Improving energy efficiency of security-aware storage systems is challenging, because security and energy security and energy efficiency is to profile encryption algorithms to decide if storage systems would

  1. System efficiency analysis for high power solid state radio frequency transmitter

    SciTech Connect (OSTI)

    Jain, Akhilesh, E-mail: ajain@rrcat.gov.in; Sharma, D. K.; Gupta, A. K.; Lad, M. R.; Hannurkar, P. R. [RF Systems Division, Raja Ramanna Centre for Advanced Technology, Indore 452013 (India)] [RF Systems Division, Raja Ramanna Centre for Advanced Technology, Indore 452013 (India); Pathak, S. K. [Electromagnetics and Microwave Engineering, Institute for Plasma Research, Gandhinagar 382 428 (India)] [Electromagnetics and Microwave Engineering, Institute for Plasma Research, Gandhinagar 382 428 (India)

    2014-02-15

    This paper examines some important relationships, related with the system efficiency, for very high power, radio frequency solid-state transmitter; incorporating multiple solid-state power amplifier modules, power combiners, dividers, couplers, and control/interlock hardware. In particular, the characterization of such transmitters, at the component as well as the system level, is discussed. The analysis for studying the influence of the amplitude and phase imbalance, on useful performance parameters like system efficiency and power distribution is performed. This analysis is based on a scattering parameter model. This model serves as a template for fine-tuning the results, with the help of a system level simulator. For experimental study, this approach is applied to a recently designed modular and scalable solid-state transmitter, operating at the centre frequency of 505.8?MHz and capable of delivering a continuous power of 75 kW. Such first time presented, system level study and experimental characterization for the real time operation will be useful for the high power solid-state amplifier designs, deployed in particle accelerators.

  2. Energy Efficient Radio Resource

    E-Print Network [OSTI]

    Yanikomeroglu, Halim

    Energy Efficient Radio Resource Management in a Coordinated Multi-Cell Distributed Antenna System Hacettepe University 5 September 2014 Omer HALILOGLU (Hacettepe University) Energy Efficient Radio Resource mobility , 1 Gb/s at high mobility). Omer HALILOGLU (Hacettepe University) Energy Efficient Radio Resource

  3. Energy and Bandwidth-Efficient Key Distribution in Wireless Ad-Hoc Networks: A Cross-Layer

    E-Print Network [OSTI]

    Lazos, Loukas

    messages, and (d) average update energy. For each metric, we formulate an optimization problem and show1 Energy and Bandwidth-Efficient Key Distribution in Wireless Ad-Hoc Networks: A Cross metrics: (a) member key storage, (b) group controller (GC) transmissions, (c) multicast group (MG) update

  4. Energy and Bandwidth-Efficient Key Distribution in Wireless Ad-Hoc Networks: A Cross-Layer

    E-Print Network [OSTI]

    Poovendran, Radha

    ) multicast group (MG) update messages, and (d) average update energy. For each metric, we formulate1 Energy and Bandwidth-Efficient Key Distribution in Wireless Ad-Hoc Networks: A Cross, and GC transmissions, while significantly reducing the energy and bandwidth consumption of the network

  5. Improving the Efficiency of Light-Duty Vehicle HVAC Systems using...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Light-Duty Vehicle HVAC Systems using Zonal Thermoelectric Devices and Comfort Modeling Improving the Efficiency of Light-Duty Vehicle HVAC Systems using Zonal Thermoelectric...

  6. Efficient sampling according to a multivariate Gaussian distribution truncated on a simplex

    E-Print Network [OSTI]

    Dobigeon, Nicolas

    according to the univariate two-sided Gaussian distribution can be easily achieved with the algoritm

  7. Distributed Frequency Control of Prosumer-Based Electric Energy Systems

    SciTech Connect (OSTI)

    Nazari, MH; Costello, Z; Feizollahi, MJ; Grijalva, S; Egerstedt, M

    2014-11-01

    In this paper, we propose a distributed frequency regulation framework for prosumer-based electric energy systems, where a prosumer (producer-consumer) is defined as an intelligent agentwhich can produce, consume, and/or store electricity. Despite the frequency regulators being distributed, stability can be ensured while avoiding inter-area oscillations using a limited control effort. To achieve this, a fully distributed one-step model-predictive control protocol is proposed and analyzed, whereby each prosumer communicates solely with its neighbors in the network. The efficacy of the proposed frequency regulation framework is shown through simulations on two real-world electric energy systems of different scale and complexity. We show that prosumers can indeed bring frequency and power deviations to their desired values after small perturbations.

  8. A Distributed Facilities Automation System For IBM Buildings 

    E-Print Network [OSTI]

    Houle, W. D. Sr.

    1985-01-01

    and to provide the plant oper ator with data to allow more effi cient operations. The most widely used program, General Purpose Automation Executive (GPAX), uses the IBM Series/1 to provide moni toring, optimization, and control for facilities automation... FACILITIES AUTOMATION SYSTEM FOR IBM BUILDINGS Walter D. Houle, Sr. IBM Corporation Atlanta, Georgia INTRODUCTION Automatic building control systems have rapidly evolved from time-based on-off energy management controllers to distributed...

  9. Automated Energy Distribution and Reliability System (AEDR): Final Report

    SciTech Connect (OSTI)

    Buche, D. L.

    2008-07-01

    This report describes Northern Indiana Public Service Co. project efforts to develop an automated energy distribution and reliability system. The purpose of this project was to implement a database-driven GIS solution that would manage all of the company's gas, electric, and landbase objects.

  10. A system of launchable mesoscale robots for distributed sensing

    E-Print Network [OSTI]

    Voyles, Richard

    A system of launchable mesoscale robots for distributed sensing Kemal B. Yesina , Bradley J technologies to develop active vision modules for the mesoscale robot. A single chip CMOS video sensor is used- log video signals from the camera. Keywords: launchable, mobile, mesoscale, camera, pan-tilt 1

  11. Accountability in Cloud Computing and Distributed Computer Systems Hongda Xiao

    E-Print Network [OSTI]

    Feigenbaum, Joan

    a mechanism for holding cloud-service providers accountable but also an interesting application of secure be applicable to other aspects of data- center and cloud security. #12;Accountability in Cloud ComputingAbstract Accountability in Cloud Computing and Distributed Computer Systems Hongda Xiao 2014

  12. Topic 5: Renewable Power 1Networking and Distributed Systems

    E-Print Network [OSTI]

    Mohsenian-Rad, Hamed

    in Smart Grid 3 · We are interested in power plants with low carbon footprint: · Both CO2 and CH4 in Smart Grid 5 · Carbon footprint is also defined for power plants: · Conventional coal combustion hasTopic 5: Renewable Power 1Networking and Distributed Systems Department of Electrical & Computer

  13. SELFMONITORING DISTRIBUTED MONITORING SYSTEM FOR NUCLEAR POWER PLANTS (PRELIMINARY VERSION)

    E-Print Network [OSTI]

    SELF­MONITORING DISTRIBUTED MONITORING SYSTEM FOR NUCLEAR POWER PLANTS (PRELIMINARY VERSION) Aldo and identification are extremely important activities for the safety of a nuclear power plant. In particular inside huge and complex production plants. 1 INTRODUCTION Safety in nuclear power plants requires

  14. A Robust Optimization Framework for Analyzing Distribution Systems with Transshipment

    E-Print Network [OSTI]

    Chaudhuri, Sanjay

    A Robust Optimization Framework for Analyzing Distribution Systems with Transshipment Mabel Chou operations. Mabel Chou NUS Business School National University of Singapore Singapore 117592 Email: bizchoum Email: dscsimm@nus.edu.sg Kut C. So The Paul Merage School of Business University of California Irvine

  15. Application of an Energy Management System to a Distribution Center 

    E-Print Network [OSTI]

    Warnick, T.

    1984-01-01

    such a System in its Dallas Distribution Center. In one year the electric bills were reduced by a total of $17,668.91. Electric consumption (KWH) was reduced by thirty-one percent, electrical demand (KW) was reduced by thirty-six percent while plant...

  16. Lean Gasoline System Development for Fuel Efficient Small Cars

    SciTech Connect (OSTI)

    2013-08-30

    The General Motors and DOE cooperative agreement program DE-EE0003379 is completed. The program has integrated and demonstrated a lean-stratified gasoline engine, a lean aftertreatment system, a 12V Stop/Start system and an Active Thermal Management system along with the necessary controls that significantly improves fuel efficiency for small cars. The fuel economy objective of an increase of 25% over a 2010 Chevrolet Malibu and the emission objective of EPA T2B2 compliance have been accomplished. A brief review of the program, summarized from the narrative is: The program accelerates development and synergistic integration of four cost competitive technologies to improve fuel economy of a light-duty vehicle by at least 25% while meeting Tier 2 Bin 2 emissions standards. These technologies can be broadly implemented across the U.S. light-duty vehicle product line between 2015 and 2025 and are compatible with future and renewable biofuels. The technologies in this program are: lean combustion, innovative passive selective catalyst reduction lean aftertreatment, 12V stop/start and active thermal management. The technologies will be calibrated in a 2010 Chevrolet Malibu mid-size sedan for final fuel economy demonstration.

  17. A model for an under floor air distribution system Y.J.P. Lina,*, P.F. Lindenb

    E-Print Network [OSTI]

    Linden, Paul F.

    ; improved thermal comfort; improved ventilation efficiency and indoor air quality; reduced energy useA model for an under floor air distribution system Y.J.P. Lina,*, P.F. Lindenb a Energy gains that occur above the occupied zone are isolated from the calculation of the required space supply

  18. An Information-Based Approach to Distributed Systems Design Andrea C. Arpaci-Dusseau Remzi H. Arpaci-Dusseau

    E-Print Network [OSTI]

    Arpaci-Dusseau, Remzi

    components within the system. Central to run-time adaptation in River are two distributed algorithms an informa- tion taxonomy and explore the costs and benefits of each source through a case study of the River adaptation within River. By following our information-centric approach, we design two efficient and scalable

  19. An InformationBased Approach to Distributed Systems Design Andrea C. ArpaciDusseau Remzi H. ArpaciDusseau

    E-Print Network [OSTI]

    Arpaci-Dusseau, Andrea

    components within the system. Central to run­time adaptation in River are two distributed algorithms an informa­ tion taxonomy and explore the costs and benefits of each source through a case study of the River adaptation within River. By following our information­centric approach, we design two efficient and scalable

  20. Horizontal Class Fragmentation For Advanced Object Models in a Distributed Object Based System \\Lambda

    E-Print Network [OSTI]

    Ezeife, Christie

    Horizontal Class Fragmentation For Advanced Object Models in a Distributed Object Based System application performance on a Distributed Object Based System (DOBS) requires class fragmentation and vertical fragmentation of relations exist, but fragmentation techniques for class objects in a distributed

  1. Distributed Energy Systems in California's Future: A Preliminary Report Volume 2

    E-Print Network [OSTI]

    Balderston, F.

    2010-01-01

    OF UTILIZING DISTRIBUTED ENERGY TECHNOLOGIES . . . . . . .DISTRIBUTED ENERGY SYSTEMS I~N CALIF RNIA/S FUTURE: UU-6831Ur'l1E:i\\i-fS SECTION DISTRIBUTED ENERGY SYSTEMS STUDY GROUP

  2. Optimal Model of Distributed Energy System by Using GAMS and Case Study

    E-Print Network [OSTI]

    Yang, Yongwen; Gao, Weijun; Ruan, Yingjun; Xuan, Ji; Zhou, Nan; Marnay, Chris

    2005-01-01

    Optimal Model of Distributed Energy System by Using GAMS andEnergy Reliability, Distributed Energy Program of the U.S.Optimal Model of Distributed Energy System by Using GAMS and

  3. Optimal Combination of Distributed Energy System in an Eco-Campus of Japan

    E-Print Network [OSTI]

    Yang, Yongwen; Gao, Weijun; Zhou, Nan; Marnay, Chris

    2006-01-01

    Optimal Combination of Distributed Energy System in an Eco-and Renewable Energy, Distributed Energy Program of the U.S.OPTIMAL COMBINATION OF DISTRIBUTED ENERGY SYSTEM IN AN ECO-

  4. Advanced Inverter Technology for High Penetration Levels of PV Generation in Distribution Systems

    SciTech Connect (OSTI)

    Schauder, C.

    2014-03-01

    This subcontract report was completed under the auspices of the NREL/SCE High-Penetration Photovoltaic (PV) Integration Project, which is co-funded by the U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE) and the California Solar Initiative (CSI) Research, Development, Demonstration, and Deployment (RD&D) program funded by the California Public Utility Commission (CPUC) and managed by Itron. This project is focused on modeling, quantifying, and mitigating the impacts of large utility-scale PV systems (generally 1-5 MW in size) that are interconnected to the distribution system. This report discusses the concerns utilities have when interconnecting large PV systems that interconnect using PV inverters (a specific application of frequency converters). Additionally, a number of capabilities of PV inverters are described that could be implemented to mitigate the distribution system-level impacts of high-penetration PV integration. Finally, the main issues that need to be addressed to ease the interconnection of large PV systems to the distribution system are presented.

  5. Klystron "efficiency loop" for the ALS storage ring RF system

    E-Print Network [OSTI]

    Kwiatkowski, Slawomir; Julian, Jim; Baptiste, Kenneth

    2002-01-01

    to Mod, Feb. 7, 2002] SRRF Klystron Beam Current (A) [AfterTime (hrs) Figure 2: SRRF Klystron Efficiency Comparison forKLYSTRON “EFFICIENCY LOOP” FOR THE ALS STORAGE RING RF

  6. Foundational Report Series: Advanced Distribution Management Systems for Grid Modernization

    SciTech Connect (OSTI)

    Wang, Jianhui

    2015-09-01

    This report describes the application functions for distribution management systems (DMS). The application functions are those surveyed by the IEEE Power and Energy Society’s Task Force on Distribution Management Systems. The description of each DMS application includes functional requirements and the key features and characteristics in current and future deployments, as well as a summary of the major benefits provided by each function to stakeholders — from customers to shareholders. Due consideration is paid to the fact that the realizable benefits of each function may differ by type of utility, whether investor-owned, cooperative, or municipal. This report is sufficient to define the functional requirements of each application for system procurement (request-for-proposal [RFP]) purposes and for developing preliminary high-level use cases for those functions. However, it should not be considered a design document that will enable a vendor or software developer to design and build actual DMS applications.

  7. The Fermilab CMTF cryogenic distribution remote control system

    SciTech Connect (OSTI)

    Pei, L.; Theilacker, J.; Klebaner, A.; Martinez, A.; Bossert, R.

    2014-01-29

    The Cryomodule Test Facility (CMTF) is able to provide the necessary test bed for measuring the performance of Superconducting Radio Frequency (SRF) cavities in a cryomodule (CM). The CMTF have seven 300 KW screw compressors, two liquid helium refrigerators, and two Cryomodule Test Stands (CMTS). CMTS1 is designed for 1.3 GHz cryomodule operating in a pulsed mode (PM) and CMTS2 is for cryomodule operating in Half-Wave (HW) and Continuous Wave (CW) mode. Based on the design requirement, each subsystem has to be far away from each other and be placed in distant locations. Therefore choosing Siemens Process Control System 7-400, DL205 PLC, Synoptic and Fermilab ACNET are the ideal choices for CMTF cryogenic distribution real-time remote control system. This paper presents a method which has been successfully used by many Fermilab distribution cryogenic real-time remote control systems.

  8. Econophysical Dynamics of Market-Based Electric Power Distribution Systems

    E-Print Network [OSTI]

    Nicolas Ho; David P. Chassin

    2006-02-09

    As energy markets begin clearing at sub-hourly rates, their interaction with load control systems becomes a potentially important consideration. A simple model for the control of thermal systems using market-based power distribution strategies is proposed, with particular attention to the behavior and dynamics of electric building loads and distribution-level power markets. Observations of dynamic behavior of simple numerical model are compared to that of an aggregate continuous model. The analytic solution of the continuous model suggests important deficiencies in each. The continuous model provides very valuable insights into how one might design such load control system and design the power markets they interact with. We also highlight important shortcomings of the continuous model which we believe must be addressed using discrete models.

  9. DistributedAutomata and Simple Test Tube Systems A Project Report

    E-Print Network [OSTI]

    Harsha, Prahladh

    Distributed­Automata and Simple Test Tube Systems A Project Report Submitted in partial fulfillment

  10. Transmission Pricing of Distributed Multilateral Energy Transactions to Ensure System Security and Guide Economic Dispatch

    E-Print Network [OSTI]

    Ilic, Marija; Hsieh, Eric; Remanan, Prasad

    2004-06-16

    Transmission Pricing of Distributed Multilateral Energy Transactions to Ensure System Security and Guide Economic Dispatch...

  11. An Energy Efficient Cognitive Radio System with Quantized Soft Sensing and Duration Analysis

    E-Print Network [OSTI]

    Shihada, Basem

    An Energy Efficient Cognitive Radio System with Quantized Soft Sensing and Duration Analysis Abdul.shihada}@kaust.edu.sa Abstract--In this paper, an energy efficient cognitive radio system is proposed. The proposed design--Spectrum sharing, Energy efficiency, Spectrum sensing, Resource allocation, I. INTRODUCTION Carbon dioxide

  12. Energy Efficiency Analysis of MISO-OFDM Communication Systems Considering Power and Capacity Constraints

    E-Print Network [OSTI]

    Wang, Cheng-Xiang

    Energy Efficiency Analysis of MISO-OFDM Communication Systems Considering Power and Capacity subchannel capacity threshold. Moreover, the energy efficiency of MISO-OFDM communication systems starts-input single-output (MISO) . orthogonal frequency division multiplexing (OFDM) . energy efficiency. capacity

  13. Energy Efficiency for Ultrascale Systems: Challenges and Trends from Nesus Project

    E-Print Network [OSTI]

    Lefčvre, Laurent

    , modeling and simulation of ultrascale systems, energy-aware scheduling and resource management, and energy-efficientEnergy Efficiency for Ultrascale Systems: Challenges and Trends from Nesus Project Michel Bagein1. Therefore, this paper presents challenges and trends associated with energy efficiency for ultrascale

  14. Energy-Efficient, Utility Accrual Scheduling under Resource Constraints for Mobile Embedded Systems

    E-Print Network [OSTI]

    Ravindran, Binoy

    Energy-Efficient, Utility Accrual Scheduling under Resource Constraints for Mobile Embedded Systems the Resource-constrained Energy- Efficient Utility Accrual Algorithm (or ReUA). ReUA con- siders an application) maximizing the system-level energy efficiency. At the same time, resource dependencies must be respected

  15. An Efficient Energy Management System for Android Phone Using Bayesian Networks

    E-Print Network [OSTI]

    Cho, Sung-Bae

    An Efficient Energy Management System for Android Phone Using Bayesian Networks Young-Seol Lee, proximity, light and orientation sensors for context-awareness. Energy-efficient battery management systems, it becomes an issue to develop the techniques for efficient energy management on a mobile phone [2, 3, 4

  16. Efficiency improvement of a ground coupled heat pump system from energy management

    E-Print Network [OSTI]

    Fernández de Córdoba, Pedro

    Efficiency improvement of a ground coupled heat pump system from energy management N. Pardo a,*, Á coupled heat pump Energy efficiency Numerical simulation a b s t r a c t The installed capacity of an air to improve the efficiency of a ground coupled heat pump air conditioning system by adapting its produced

  17. Protecting Intelligent Distributed Power Grids Against Cyber...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    distribution, IT networks, and control systems-that use automated data analysis and demand response capabilities to increase system functionality, efficiency, and...

  18. A Better Steam Engine: Designing a Distributed Concentrating Solar Combined Heat and Power System

    E-Print Network [OSTI]

    Norwood, Zachary Mills

    2011-01-01

    boosting the overall solar efficiency of the system, DCS-CHPheat at 8-10% solar-electric efficiency while simultaneouslyare at 20 – 35% solar-electric efficiency (Mills [18]). This

  19. Demonstration of a Highly Efficient Solid Oxide Fuel Cell Power System Using Adiabatic Steam Reforming and Anode Gas Recirculation

    SciTech Connect (OSTI)

    Powell, Michael R.; Meinhardt, Kerry D.; Sprenkle, Vincent L.; Chick, Lawrence A.; Mcvay, Gary L.

    2012-05-01

    Solid oxide fuel cells (SOFC) are currently being developed for a wide variety of applications because of their high efficiency at multiple power levels. Applications for SOFCs encompass a large range of power levels including 1-2 kW residential combined heat and power applications, 100-250 kW sized systems for distributed generation and grid extension, and MW-scale power plants utilizing coal. This paper reports on the development of a highly efficient, small-scale SOFC power system operating on methane. The system uses adiabatic steam reforming of methane and anode gas recirculation to achieve high net electrical efficiency. The anode exit gas is recirculated and all of the heat and water required for the endothermic reforming reaction are provided by the anode gas emerging from the SOFC stack. Although the single-pass fuel utilization is only about 55%, because of the anode gas recirculation the overall fuel utilization is up to 93%. The demonstrated system achieved gross power output of 1650 to 2150 watts with a maximum net LHV efficiency of 56.7% at 1720 watts. Overall system efficiency could be further improved to over 60% with use of properly sized blowers.

  20. Workload Decomposition for Power Efficient Storage Systems Lanyue Lu and Peter Varman

    E-Print Network [OSTI]

    Workload Decomposition for Power Efficient Storage Systems Lanyue Lu and Peter Varman Rice the dif- ferent components of the data center, the storage system accounts for a significant percentage for developing energy efficient storage systems for current data centers. As storage systems evolve towards

  1. Integrated Computing, Communication, and Distributed Control of Deregulated Electric Power Systems

    SciTech Connect (OSTI)

    Bajura, Richard; Feliachi, Ali

    2008-09-24

    Restructuring of the electricity market has affected all aspects of the power industry from generation to transmission, distribution, and consumption. Transmission circuits, in particular, are stressed often exceeding their stability limits because of the difficulty in building new transmission lines due to environmental concerns and financial risk. Deregulation has resulted in the need for tighter control strategies to maintain reliability even in the event of considerable structural changes, such as loss of a large generating unit or a transmission line, and changes in loading conditions due to the continuously varying power consumption. Our research efforts under the DOE EPSCoR Grant focused on Integrated Computing, Communication and Distributed Control of Deregulated Electric Power Systems. This research is applicable to operating and controlling modern electric energy systems. The controls developed by APERC provide for a more efficient, economical, reliable, and secure operation of these systems. Under this program, we developed distributed control algorithms suitable for large-scale geographically dispersed power systems and also economic tools to evaluate their effectiveness and impact on power markets. Progress was made in the development of distributed intelligent control agents for reliable and automated operation of integrated electric power systems. The methodologies employed combine information technology, control and communication, agent technology, and power systems engineering in the development of intelligent control agents for reliable and automated operation of integrated electric power systems. In the event of scheduled load changes or unforeseen disturbances, the power system is expected to minimize the effects and costs of disturbances and to maintain critical infrastructure operational.

  2. Interconnecting PV on New York City's Secondary Network Distribution System

    SciTech Connect (OSTI)

    K. Anderson; M. Coddington; K. Burman; S. Hayter; B. Kroposki; and A. Watson

    2009-11-30

    The U.S. Department of Energy (DOE) has teamed with cities across the country through the Solar America Cities (SAC) partnership program to help reduce barriers and accelerate implementation of solar energy. The New York City SAC team is a partnership between the City University of New York (CUNY), the New York City Mayor s Office of Long-term Planning and Sustainability, and the New York City Economic Development Corporation (NYCEDC).The New York City SAC team is working with DOE s National Renewable Energy Laboratory (NREL) and Con Edison, the local utility, to develop a roadmap for photovoltaic (PV) installations in the five boroughs. The city set a goal to increase its installed PV capacity from1.1 MW in 2005 to 8.1 MW by 2015 (the maximum allowed in 2005). A key barrier to reaching this goal, however, is the complexity of the interconnection process with the local utility. Unique challenges are associated with connecting distributed PV systems to secondary network distribution systems (simplified to ���¢��������networks���¢������� in this report). Although most areas of the country use simpler radial distribution systems to distribute electricity, larger metropolitan areas like New York City typically use networks to increase reliability in large load centers. Unlike the radial distribution system, where each customer receives power through a single line, a network uses a grid of interconnected lines to deliver power to each customer through several parallel circuits and sources. This redundancy improves reliability, but it also requires more complicated coordination and protection schemes that can be disrupted by energy exported from distributed PV systems. Currently, Con Edison studies each potential PV system in New York City to evaluate the system s impact on the network, but this is time consuming for utility engineers and may delay the customer s project or add cost for larger installations. City leaders would like to streamline this process to facilitate faster, simpler, and less expensive distributed PV system interconnections. To assess ways to improve the interconnection process, NREL conducted a four-part study with support from DOE. The NREL team then compiled the final reports from each study into this report. In Section 1���¢��������PV Deployment Analysis for New York City���¢��������we analyze the technical potential for rooftop PV systems in the city. This analysis evaluates potential PV power production in ten Con Edison networks of various locations and building densities (ranging from high density apartments to lower density single family homes). Next, we compare the potential power production to network loads to determine where and when PV generation is most likely to exceed network load and disrupt network protection schemes. The results of this analysis may assist Con Edison in evaluating future PV interconnection applications and in planning future network protection system upgrades. This analysis may also assist other utilities interconnecting PV systems to networks by defining a method for assessing the technical potential of PV in the network and its impact on network loads. Section 2���¢��������A Briefing for Policy Makers on Connecting PV to a Network Grid���¢��������presents an overview intended for nontechnical stakeholders. This section describes the issues associated with interconnecting PV systems to networks, along with possible solutions. Section 3���¢��������Technical Review of Concerns and Solutions to PV Interconnection in New Y

  3. An electrochemical system for efficiently harvesting low-grade heat energy

    E-Print Network [OSTI]

    Lee, Seok Woo

    Efficient and low-cost thermal energy-harvesting systems are needed to utilize the tremendous low-grade heat sources. Although thermoelectric devices are attractive, its efficiency is limited by the relatively low ...

  4. Parallel Breadth-First Search on Distributed Memory Systems

    SciTech Connect (OSTI)

    Computational Research Division; Buluc, Aydin; Madduri, Kamesh

    2011-04-15

    Data-intensive, graph-based computations are pervasive in several scientific applications, and are known to to be quite challenging to implement on distributed memory systems. In this work, we explore the design space of parallel algorithms for Breadth-First Search (BFS), a key subroutine in several graph algorithms. We present two highly-tuned par- allel approaches for BFS on large parallel systems: a level-synchronous strategy that relies on a simple vertex-based partitioning of the graph, and a two-dimensional sparse matrix- partitioning-based approach that mitigates parallel commu- nication overhead. For both approaches, we also present hybrid versions with intra-node multithreading. Our novel hybrid two-dimensional algorithm reduces communication times by up to a factor of 3.5, relative to a common vertex based approach. Our experimental study identifies execu- tion regimes in which these approaches will be competitive, and we demonstrate extremely high performance on lead- ing distributed-memory parallel systems. For instance, for a 40,000-core parallel execution on Hopper, an AMD Magny- Cours based system, we achieve a BFS performance rate of 17.8 billion edge visits per second on an undirected graph of 4.3 billion vertices and 68.7 billion edges with skewed degree distribution.

  5. A Low-Cost, High-Efficiency Periodic Flow Gas Turbine for Distributed Energy Generation

    SciTech Connect (OSTI)

    Dr. Adam London

    2008-06-20

    The proposed effort served as a feasibility study for an innovative, low-cost periodic flow gas turbine capable of realizing efficiencies in the 39-48% range.

  6. System and method to determine electric motor efficiency using an equivalent circuit

    DOE Patents [OSTI]

    Lu, Bin; Habetler, Thomas G.

    2015-10-27

    A system and method for determining electric motor efficiency includes a monitoring system having a processor programmed to determine efficiency of an electric motor under load while the electric motor is online. The determination of motor efficiency is independent of a rotor speed measurement. Further, the efficiency is based on a determination of stator winding resistance, an input voltage, and an input current. The determination of the stator winding resistance occurs while the electric motor under load is online.

  7. System and method to determine electric motor efficiency using an equivalent circuit

    DOE Patents [OSTI]

    Lu, Bin; Habetler, Thomas G

    2015-11-06

    A system and method for determining electric motor efficiency includes a monitoring system having a processor programmed to determine efficiency of an electric motor under load while the electric motor is online. The determination of motor efficiency is independent of a rotor speed measurement. Further, the efficiency is based on a determination of stator winding resistance, an input voltage, and an input current. The determination of the stator winding resistance occurs while the electric motor under load is online.

  8. System and method to determine electric motor efficiency using an equivalent circuit

    DOE Patents [OSTI]

    Lu, Bin (Kenosha, WI); Habetler, Thomas G. (Snellville, GA)

    2011-06-07

    A system and method for determining electric motor efficiency includes a monitoring system having a processor programmed to determine efficiency of an electric motor under load while the electric motor is online. The determination of motor efficiency is independent of a rotor speed measurement. Further, the efficiency is based on a determination of stator winding resistance, an input voltage, and an input current. The determination of the stator winding resistance occurs while the electric motor under load is online.

  9. Compiling software for a hierarchical distributed processing system

    DOE Patents [OSTI]

    Archer, Charles J; Blocksome, Michael A; Ratterman, Joseph D; Smith, Brian E

    2013-12-31

    Compiling software for a hierarchical distributed processing system including providing to one or more compiling nodes software to be compiled, wherein at least a portion of the software to be compiled is to be executed by one or more nodes; compiling, by the compiling node, the software; maintaining, by the compiling node, any compiled software to be executed on the compiling node; selecting, by the compiling node, one or more nodes in a next tier of the hierarchy of the distributed processing system in dependence upon whether any compiled software is for the selected node or the selected node's descendents; sending to the selected node only the compiled software to be executed by the selected node or selected node's descendent.

  10. Performance of thermal distribution systems in large commercial buildings

    E-Print Network [OSTI]

    Xu, T.

    2011-01-01

    Energy Efficiency and Renewable Energy, Office of BuildingEnergy Efficiency and Renewable Energy, Office of Building

  11. Greening the Networks of Large-Scale Distributed Systems

    E-Print Network [OSTI]

    Lefčvre, Laurent

    -tier fat-tree architecture Energy savings of Green compared to No off : - 73% for a 20% workload - 68Greening the Networks of Large-Scale Distributed Systems ENS de Lyon ­ INRIA RESO ­ UCBL ­ LIP://perso.ens-lyon.fr/annececile.orgerie/networks.html HERMES : High-level Energy-awaRe Model for bandwidth reservation in End-to-end NetworkS · Unused network

  12. Feasibility Study: Ductless Hydronic Distribution Systems with Fan Coil Delivery

    SciTech Connect (OSTI)

    Springer, D.; Dakin, B.; Backman, C.

    2012-07-01

    The primary objectives of this study are to estimate potential energy savings relative to conventional ducted air distribution, and to identify equipment requirements, costs, and barriers with a focus on ductless hydronic delivery systems that utilize water-to-air terminal units in each zone. Results indicate that annual heating and cooling energy use can be reduced by up to 27% assuming replacement of the conventional 13 SEER heat pump and coil with a similarly rated air-to-water heat pump.

  13. Best Practices for Energy Efficient Cleanrooms: Control of Chilled Water System

    E-Print Network [OSTI]

    : Control of chilled water system Tengfang Xu Contents HVAC WATER SYSTEMSLBNL-58635 Best Practices for Energy Efficient Cleanrooms: Control of Chilled Water System Tengfang.............................................................................................. 2 Control of chilled water system

  14. A new power combining and outphasing modulation system for high-efficiency power amplification

    E-Print Network [OSTI]

    Perreault, David J.

    This paper describes a new power combining and outphasing system that provides both high efficiency and linear output control. Whereas conventional outphasing systems utilize two power amplifiers, the system introduced ...

  15. A New Power Combining and Outphasing Modulation System for High-Efficiency Power Amplification

    E-Print Network [OSTI]

    Perreault, David J.

    This paper describes a new power combining and outphasing system that provides both high efficiency and linear output control. Whereas conventional outphasing systems utilize two power amplifiers, the system introduced ...

  16. Implementation and Rejection of Industrial Steam System Energy Efficiency Measures

    E-Print Network [OSTI]

    Therkelesen, Peter

    2014-01-01

    ISO  50001  Energy  management  systems  –  Requirements  ISO   50001   -­?Energy   management   system   standard,  energy   management   system,   such   as   ISO   50001,  

  17. Increased Engine Efficiency via Advancements in Engine Combustion Systems

    Office of Energy Efficiency and Renewable Energy (EERE)

    Presentation given at the 16th Directions in Engine-Efficiency and Emissions Research (DEER) Conference in Detroit, MI, September 27-30, 2010.

  18. Chapter 5: Increasing Efficiency of Building Systems and Technologies...

    Office of Environmental Management (EM)

    the energy savings opportunities offered by existing energy efficiency technologies and new technology advances supported by ongoing RDD&D activities, the energy use intensity...

  19. Multi-State Load Models for Distribution System Analysis

    SciTech Connect (OSTI)

    Schneider, Kevin P.; Fuller, Jason C.; Chassin, David P.

    2011-11-01

    Recent work in the field of distribution system analysis has shown that the traditional method of peak load analysis is not adequate for the analysis of emerging distribution system technologies. Voltage optimization, demand response, electric vehicle charging, and energy storage are examples of technologies with characteristics having daily, seasonal, and/or annual variations. In addition to the seasonal variations, emerging technologies such as demand response and plug in electric vehicle charging have the potential to send control signals to the end use loads which will affect how they consume energy. In order to support time-series analysis over different time frames and to incorporate potential control signal inputs it is necessary to develop detailed end use load models which accurately represent the load under various conditions, and not just during the peak load period. This paper will build on previous work on detail end use load modeling in order to outline the method of general multi-state load models for distribution system analysis.

  20. Subsystem Interaction Analysis in Power Distribution Systems of Next Generation Airlifters

    E-Print Network [OSTI]

    Lindner, Douglas K.

    tolerant, autonomously controlled electrical power system to deliver high quality power from the sources electronics, fault tolerant electrical power distribution systems and electrically driven primary flight1 Subsystem Interaction Analysis in Power Distribution Systems of Next Generation Airlifters Sriram

  1. GUIDE TO CALCULATING TRANSPORT EFFICIENCY OF AEROSOLS IN OCCUPATIONAL AIR SAMPLING SYSTEMS

    SciTech Connect (OSTI)

    Hogue, M.; Hadlock, D.; Thompson, M.; Farfan, E.

    2013-11-12

    This report will present hand calculations for transport efficiency based on aspiration efficiency and particle deposition losses. Because the hand calculations become long and tedious, especially for lognormal distributions of aerosols, an R script (R 2011) will be provided for each element examined. Calculations are provided for the most common elements in a remote air sampling system, including a thin-walled probe in ambient air, straight tubing, bends and a sample housing. One popular alternative approach would be to put such calculations in a spreadsheet, a thorough version of which is shared by Paul Baron via the Aerocalc spreadsheet (Baron 2012). To provide greater transparency and to avoid common spreadsheet vulnerabilities to errors (Burns 2012), this report uses R. The particle size is based on the concept of activity median aerodynamic diameter (AMAD). The AMAD is a particle size in an aerosol where fifty percent of the activity in the aerosol is associated with particles of aerodynamic diameter greater than the AMAD. This concept allows for the simplification of transport efficiency calculations where all particles are treated as spheres with the density of water (1 g?cm-3). In reality, particle densities depend on the actual material involved. Particle geometries can be very complicated. Dynamic shape factors are provided by Hinds (Hinds 1999). Some example factors are: 1.00 for a sphere, 1.08 for a cube, 1.68 for a long cylinder (10 times as long as it is wide), 1.05 to 1.11 for bituminous coal, 1.57 for sand and 1.88 for talc. Revision 1 is made to correct an error in the original version of this report. The particle distributions are based on activity weighting of particles rather than based on the number of particles of each size. Therefore, the mass correction made in the original version is removed from the text and the calculations. Results affected by the change are updated.

  2. Modeling of Thermal Storage Systems in MILP Distributed Energy Resource Models

    E-Print Network [OSTI]

    Steen, David

    2014-01-01

    in latent heat energy storage systems: A review," Renewableof thermal energy storage systems," International Journal ofModeling of Thermal Storage Systems in MILP Distributed

  3. A New Thermal-Conscious System-Level Methodology for Energy-Efficient Processor Voltage Selection

    E-Print Network [OSTI]

    Wang, Yu

    A New Thermal-Conscious System-Level Methodology for Energy-Efficient Processor Voltage Selection a thermal-conscious system-level methodology to make energy-efficient voltage selection (VS) for nanometer), thermal resistance, are integrated and considered in our system models, and their impacts on energy

  4. Energy efficiency in public buildings through ICT based control and monitoring systems

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    functions and tools to add energy efficiency features to the Building Management System (BMS), by monitoringEnergy efficiency in public buildings through ICT based control and monitoring systems G and spaces by implementing an intelligent ICT-based building monitoring and managing system. Actions

  5. Numeral systems across languages support efficient communication: From approximate numerosity to recursion

    E-Print Network [OSTI]

    Regier, Terry

    Numeral systems across languages support efficient communication: From approximate numerosity this spectrum. We find that these numeral systems all reflect a functional need for efficient communication differ qualitatively in their numeral systems. At one extreme, some languages have a small set of number

  6. Energy Efficient Cooperative MIMO Systems Hsin-Yi Shen, Haiming Yang, Shivkumar Kalyanaraman

    E-Print Network [OSTI]

    Kalyanaraman, Shivkumar

    Energy Efficient Cooperative MIMO Systems Hsin-Yi Shen, Haiming Yang, Shivkumar Kalyanaraman an energy efficient cooperative MIMO system. Space-time block codes (STBC) and code combining techniques to cooperation overheads [1]. Thus there is tradeoff between energy consumption and system capacity in proposed

  7. TRACER: A Trace Replay Tool to Evaluate Energy-Efficiency of Mass Storage Systems

    E-Print Network [OSTI]

    Qin, Xiao

    TRACER: A Trace Replay Tool to Evaluate Energy-Efficiency of Mass Storage Systems Zhuo Liu1 , Fei for Optoelectronics 1 Key Laboratory of Data Storage Systems,Ministry of Education of China 1 School of Computer Sci://www.eng.auburn.edu/xqin * Corresponding Author: wufei@hust.edu.cn Abstract--Improving energy efficiency of mass storage systems has become

  8. Efficiency-Driven Design Time Optimization of a Hybrid Energy Storage System with Networked Charge Transfer

    E-Print Network [OSTI]

    Pedram, Massoud

    Efficiency-Driven Design Time Optimization of a Hybrid Energy Storage System with Networked Charge efficiency for various problem setups and scales. Keywords--hybrid energy storage system; networked charge transfer interconnect; placement I. INTRODUCTION Energy storage systems (ESSs) store the excess energy

  9. Low background high efficiency radiocesium detection system based on positron emission tomography technology

    SciTech Connect (OSTI)

    Yamamoto, Seiichi; Ogata, Yoshimune [Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, 1-1-20 Daiko-Minami, Higashi-ku, Nagoya 461-8673 (Japan)] [Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, 1-1-20 Daiko-Minami, Higashi-ku, Nagoya 461-8673 (Japan)

    2013-09-15

    After the 2011 nuclear power plant accident at Fukushima, radiocesium contamination in food became a serious concern in Japan. However, low background and high efficiency radiocesium detectors are expensive and huge, including semiconductor germanium detectors. To solve this problem, we developed a radiocesium detector by employing positron emission tomography (PET) technology. Because {sup 134}Cs emits two gamma photons (795 and 605 keV) within 5 ps, they can selectively be measured with coincidence. Such major environmental gamma photons as {sup 40}K (1.46 MeV) are single photon emitters and a coincidence measurement reduces the detection limit of radiocesium detectors. We arranged eight sets of Bi{sub 4}Ge{sub 3}O{sub 12} (BGO) scintillation detectors in double rings (four for each ring) and measured the coincidence between these detectors using PET data acquisition system. A 50 × 50 × 30 mm BGO was optically coupled to a 2 in. square photomultiplier tube (PMT). By measuring the coincidence, we eliminated most single gamma photons from the energy distribution and only detected those from {sup 134}Cs at an average efficiency of 12%. The minimum detectable concentration of the system for the 100 s acquisition time is less than half of the food monitor requirements in Japan (25 Bq/kg). These results show that the developed radiocesium detector based on PET technology is promising to detect low level radiocesium.

  10. Untappable key distribution system: a one-time-pad booster

    E-Print Network [OSTI]

    Geraldo A. Barbosa; Jeroen van de Graaf

    2015-07-08

    One-time-pad (OTP) encryption simply cannot be cracked, even by a quantum computer. The need of sharing in a secure way supplies of symmetric random keys turned the method almost obsolete as a standing-alone method for fast and large volume telecommunication. Basically, this secure sharing of keys and their renewal, once exhausted, had to be done through couriers, in a slow and costly process. This paper presents a solution for this problem providing a fast and unlimited renewal of secure keys: An untappable key distribution system is presented and detailed. This fast key distribution system utilizes two layers of confidentially protection: 1) Physical noise intrinsic to the optical channel that turn the coded signals into stealth signals and 2) Privacy amplification using a bit pool of refreshed entropy run after run, to eliminate any residual information. The resulting level of security is rigorously calculated and demonstrates that the level of information an eavesdropper could obtain is completely negligible. The random bit sequences, fast and securely distributed, can be used to encrypt text, data or voice.

  11. Energy-Efficient Virtual Machine Replication and Placement in a Cloud Computing System

    E-Print Network [OSTI]

    Pedram, Massoud

    Energy-Efficient Virtual Machine Replication and Placement in a Cloud Computing System Hadi the servers more efficiently. In this paper, the problem of energy-efficient VM placement in a cloud computing in a datacenter, a cloud provider can reduce the total energy consumption for servicing his clients with little

  12. Energy efficient control for mechanical systems based on inherent dynamical structures

    E-Print Network [OSTI]

    Ober-Blöbaum, Sina

    Energy efficient control for mechanical systems based on inherent dynamical structures Kathrin for energy efficient solutions. This method is based on a motion planning library consisting of three types solutions and in general a good initial guess is required to ensure global energy efficiency and fast

  13. Improving Compressed Air System Efficiency- Know What You Really Need 

    E-Print Network [OSTI]

    Terrell, R. E.

    1998-01-01

    Compressed air is often the most expensive utility in an industrial facility, and cost-effective efficiency opportunities in both the production and use of compressed air are often ignored by facility operators. Leaks, inappropriate uses...

  14. Boiler System Efficiency Improves with Effective Water Treatment 

    E-Print Network [OSTI]

    Bloom, D.

    1999-01-01

    efficiency. Condensate which is contaminated with corrosion products or process chemicals, however, is ill fit for reuse; and steam which leaks from piping, valves, traps and connections cannot be recovered. Effective chemical treatment, in conjunction...

  15. Energy efficiency of Pacific Northwest agriculture irrigation pumping systems

    SciTech Connect (OSTI)

    Wilfert, G.L.; Harrer, B.J.

    1987-03-01

    This document addresses the energy use and efficiency characteristics of pumping plants used to irrigate agricultural cropland in the Pacific Northwest. The principal focus of this document is on field information obtained from tests of irrigation pumping plants.

  16. Electrical Equipment Replacement: Energy Efficiency versus System Compatibility 

    E-Print Network [OSTI]

    Massey, G. W.

    2005-01-01

    Electrical equipment components are replaced every day because of failure, obsolescence, or upgrade. Because of technological gains, replacement components are typically more energy efficient than older equipment. Life cycle cost analyses encourage...

  17. Abstract--The distribution system provides major opportunities for smart grid concepts. One way to approach

    E-Print Network [OSTI]

    systems, fuel cells and AC storage have an inverter to interface with the electrical distribution system the distribution system down into small clusters or microgrids, with distributed optimizing controls coordinating technologies, such as internal combustion (IC) engines, gas turbines, microturbines, photovoltaic systems, fuel

  18. Design and Evaluation of an Online Anomaly Detector for Distributed Storage Systems

    E-Print Network [OSTI]

    He, Xubin "Ben"

    Design and Evaluation of an Online Anomaly Detector for Distributed Storage Systems Xin Chen1, and storage devices, are difficult to diagnose and isolate in distributed storage systems. In this paper, we and accurately identify the faulty sources in a system node of a distributed storage system. Our method exploits

  19. AMP: An Affinity-based Metadata Prefetching Scheme in Large-Scale Distributed Storage Systems

    E-Print Network [OSTI]

    Zhu, Yifeng

    1 AMP: An Affinity-based Metadata Prefetching Scheme in Large-Scale Distributed Storage Systems Lin significantly reduce access latency for I/O systems. In distributed storage systems, prefetching for metadata Prefetching (AMP) scheme is proposed for metadata servers in large-scale distributed storage systems

  20. Fermilab Muon Campus g-2 Cryogenic Distribution Remote Control System

    E-Print Network [OSTI]

    Pei, L; Klebaner, A; Soyars, W; Bossert, R

    2015-01-01

    The Muon Campus (MC) is able to measure Muon g-2 with high precision and comparing its value to the theoretical prediction. The MC has four 300 KW screw compressors and four liquid helium refrigerators. The centerpiece of the Muon g-2 experiment at Fermilab is a large, 50-foot-diameter superconducting muon storage ring. This one-of-a-kind ring, made of steel, aluminum and superconducting wire, was built for the previous g-2 experiment at Brookhaven. Due to each subsystem has to be far away from each other and be placed in the distant location, therefore, Siemens Process Control System PCS7-400, Automation Direct DL205 & DL05 PLC, Synoptic and Fermilab ACNET HMI are the ideal choices as the MC g-2 cryogenic distribution real-time and on-Line remote control system. This paper presents a method which has been successfully used by many Fermilab distribution cryogenic real-time and On-Line remote control systems.

  1. Commercial thermal distribution systems, Final report for CIEE/CEC

    E-Print Network [OSTI]

    Xu, T.

    2011-01-01

    compressor efficiencies and higher air-conditioning energyEnergy Efficiency Energy Service Company Energy Service Provider Fan Static Pressure Foot Horsepower Heating, Ventilation and Air Conditioning

  2. Economic evaluation of distribution system smart grid investments

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Onen, Ahmet; Cheng, Danling; Broadwater, Robert P.; Scirbona, Charlie; Cocks, George; Hamilton, Stephanie; Wang, Xiaoyu; Roark, Jeffrey

    2014-12-31

    This paper investigates economic benefits of smart grid automation investments. A system consisting of 7 substations and 14 feeders is used in the evaluation. Here benefits that can be quantified in terms of dollar savings are considered, termed “hard dollar” benefits. Smart Grid investment evaluations to be considered include investments in improved efficiency, more cost effective use of existing system capacity with automated switches, and coordinated control of capacitor banks and voltage regulators. These Smart Grid evaluations are sequentially ordered, resulting in a series of incremental hard dollar benefits. Hard dollar benefits come from improved efficiency, delaying large capital equipmentmore »investments, shortened storm restoration times, and reduced customer energy use. Analyses used in the evaluation involve hourly power flow analysis over multiple years and Monte Carlo simulations of switching operations during storms using a reconfiguration for restoration algorithm. The economic analysis uses the time varying value of the Locational Marginal Price. Algorithms used include reconfiguration for restoration involving either manual or automated switches and coordinated control involving two modes of control. Field validations of phase balancing and capacitor design results are presented. The evaluation shows that investments in automation can improve performance while at the same time lowering costs.« less

  3. Economic evaluation of distribution system smart grid investments

    SciTech Connect (OSTI)

    Onen, Ahmet; Cheng, Danling; Broadwater, Robert P.; Scirbona, Charlie; Cocks, George; Hamilton, Stephanie; Wang, Xiaoyu; Roark, Jeffrey

    2014-12-31

    This paper investigates economic benefits of smart grid automation investments. A system consisting of 7 substations and 14 feeders is used in the evaluation. Here benefits that can be quantified in terms of dollar savings are considered, termed “hard dollar” benefits. Smart Grid investment evaluations to be considered include investments in improved efficiency, more cost effective use of existing system capacity with automated switches, and coordinated control of capacitor banks and voltage regulators. These Smart Grid evaluations are sequentially ordered, resulting in a series of incremental hard dollar benefits. Hard dollar benefits come from improved efficiency, delaying large capital equipment investments, shortened storm restoration times, and reduced customer energy use. Analyses used in the evaluation involve hourly power flow analysis over multiple years and Monte Carlo simulations of switching operations during storms using a reconfiguration for restoration algorithm. The economic analysis uses the time varying value of the Locational Marginal Price. Algorithms used include reconfiguration for restoration involving either manual or automated switches and coordinated control involving two modes of control. Field validations of phase balancing and capacitor design results are presented. The evaluation shows that investments in automation can improve performance while at the same time lowering costs.

  4. Energy efficient RF communication systems for wireless microsensors

    E-Print Network [OSTI]

    Cho, SeongHwan, 1974-

    2002-01-01

    Emerging distributed wireless microsensor networks will enable the reliable and fault tolerant monitoring of the environment. Microsensors are required to operate for years from a small energy source while maintaining a ...

  5. Concept for a super-clean super-efficient pressurized fluidized-bed combustion system

    SciTech Connect (OSTI)

    Mollott, D.J.; Reed, M.

    1994-12-31

    A paper study for a highly efficient, environmentally benign, coal-fired electric power generation system, is presented. This system falls in the category of pressurized fluidized-bed combustion (PFBC) systems which has been dubbed super-clean super-efficient PFBC`s. The system presented starts with the second-generation PFBC concept and adds on advanced gas turbine, a solid oxide fuel cell, a supercritical steam cycle, a second low-temperature rankine cycle which pulls energy from the steam condenser, and inlet air cooling. The thermodynamic efficiency of the system is calculated to be 61.8 percent based on higher heating value (HHV).

  6. Fiber-coupled nanowire photon counter at 1550 nm with 24% system detection efficiency

    E-Print Network [OSTI]

    Hu, Xiaolong

    We developed a fiber-coupled superconducting nanowire single-photon detector system in a close-cycled cryocooler and achieved 24% and 22% system detection efficiencies at wavelengths of 1550 and 1315 nm, respectively. The ...

  7. Delivering Tons to the Register: Energy Efficient Design and Operation of Residential Cooling Systems

    E-Print Network [OSTI]

    Delivering Tons to the Register: Energy Efficient Design and Operation of Residential Cooling Systems Jeffrey Siegel, Lawrence Berkeley National Laboratory Iain Walker, Lawrence Berkeley National and air conditioner performance. These parameters included placing the entire air conditioning system

  8. Robust control strategy for PV system integration in distribution systems M.J. Hossain a,

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    Robust control strategy for PV system integration in distribution systems M.J. Hossain a, , T t s " Robust control provides flexible photovoltaic (PV) accommodations. " A robust PV control can significantly enhance the penetration level. " The change in volatile PV generations is considered

  9. Improving System Energy Efficiency with Memory Rank Subsetting JUNG HO AHN, Seoul National University

    E-Print Network [OSTI]

    Kozyrakis, Christos

    4 Improving System Energy Efficiency with Memory Rank Subsetting JUNG HO AHN, Seoul National interfaces are not well tailored to achieve high energy efficiency and performance in modern chip-multiprocessor-based computer systems. Their suboptimal performance and energy inefficiency can have a significant impact

  10. Designing Efficient Systems Services and Primitives for Next-Generation Data-Centers

    E-Print Network [OSTI]

    Panda, Dhabaleswar K.

    Designing Efficient Systems Services and Primitives for Next-Generation Data-Centers K08) #12;Designing Efficient Systems Services and Primitives for Next-Generation Data-Centers K University {vaidyana, narravul, balaji, panda}@cse.ohio-state.edu Abstract Current data-centers lack

  11. AgSec: Secure and Efficient CDMA-based Aggregation for Smart Metering Systems

    E-Print Network [OSTI]

    Namboodiri, Vinod

    . For instance, it can be easily determined if a This work was supported in part by the Power Systems EngineeringAgSec: Secure and Efficient CDMA-based Aggregation for Smart Metering Systems Navid Alamatsaz and energy. Hence, utilizing data aggregation algorithms, the limited bandwidth can be efficiently utilized

  12. vGreen: A System for Energy Efficient Computing in Virtualized Environments

    E-Print Network [OSTI]

    Simunic, Tajana

    vGreen: A System for Energy Efficient Computing in Virtualized Environments Gaurav Dhiman gdhiman that vGreen can improve both performance and system level energy savings by 20% and 15% across benchmarks with the ob- jective of managing the overall energy efficiency and performance. The basic premise behind vGreen

  13. Enabling Broad Adoption of Distributed PV-storage systems Via Supervisory Planning & Control

    E-Print Network [OSTI]

    DeForest, Nicholas

    2014-01-01

    impact of wide-spread PV adoption for utilities, by creatingEnabling broad adoption of distributed PV-storage systemsEnabling broad adoption of distributed PV-storage systems

  14. Aerogel-Based Insulation for Industrial Steam Distribution Systems

    SciTech Connect (OSTI)

    John Williams

    2011-03-30

    Thermal losses in industrial steam distribution systems account for 977 trillion Btu/year in the US, more than 1% of total domestic energy consumption. Aspen Aerogels worked with Department of Energy’s Industrial Technologies Program to specify, develop, scale-up, demonstrate, and deliver Pyrogel XT®, an aerogel-based pipe insulation, to market to reduce energy losses in industrial steam systems. The product developed has become Aspen’s best selling flexible aerogel blanket insulation and has led to over 60 new jobs. Additionally, this product has delivered more than ~0.7 TBTU of domestic energy savings to date, and could produce annual energy savings of 149 TBTU by 2030. Pyrogel XT’s commercial success has been driven by it’s 2-4X better thermal performance, improved durability, greater resistance to corrosion under insulation (CUI), and faster installation times than incumbent insulation materials.

  15. Increase Energy Efficiency by Analyzing Cooling Water Systems 

    E-Print Network [OSTI]

    Phelps, P.

    2015-01-01

    ) causes hydraulic imbalance as they foul and the ?p’s fluctuate 9 ESL-IE-15-06-37 Proceedings of the Thrity-Seventh Industrial Energy Technology Conference New Orleans, LA. June 2-4, 2015 Case Study: Vacuum Tower vs. Overhead and Jet Condensers Cooling... water is critical to the efficient operation of the vacuum tower and overall energy efficiency of the refinery. 10 ESL-IE-15-06-37 Proceedings of the Thrity-Seventh Industrial Energy Technology Conference New Orleans, LA. June 2-4, 2015 11 Typical...

  16. Improved power capacity in a high efficiency klystron-like relativistic backward wave oscillator by distributed energy extraction

    SciTech Connect (OSTI)

    Xiao, Renzhen; Chen, Changhua; Cao, Yibing; Sun, Jun [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China)

    2013-12-07

    With the efficiency increase of a klystron-like relativistic backward wave oscillator, the maximum axial electric field and harmonic current simultaneously appear at the end of the beam-wave interaction region, leading to a highly centralized energy exchange in the dual-cavity extractor and a very high electric field on the cavity surface. Thus, we present a method of distributed energy extraction in this kind of devices. Particle-in-cell simulations show that with the microwave power of 5.1?GW and efficiency of 70%, the maximum axial electric field is decreased from 2.26 MV/cm to 1.28 MV/cm, indicating a threefold increase in the power capacity.

  17. Numerical Analysis of a Cold Air Distribution System 

    E-Print Network [OSTI]

    Zhu, L.; Li, R.; Yuan, D.

    2006-01-01

    non-uniform so that residents usually feel uncomfortable. The distribution of indoor airflow by cold air distribution is researched in this paper. We study indoor air distribution under different low temperature air supply conditions by numerical...

  18. Energy-Efficient Distributed Detection Via Multi-hop Transmission in Sensor Networks

    E-Print Network [OSTI]

    Dai, Huaiyu

    does not hold in practice, and makes it difficult to evaluate the true detection performance and energy expenditure. In this paper, we focus on the regime where the number of sensors is large, and investigate makes an observation Yj, i.i.d. across sensors given the hypothesis. The cumulative distribution

  19. A Better Steam Engine: Designing a Distributed Concentrating Solar Combined Heat and Power System

    E-Print Network [OSTI]

    Norwood, Zachary Mills

    2011-01-01

    Concentrating Solar Combined Heat and Power Systemfor Distributed Concentrating Solar Combined Heat and Powerof solar combined heat and power systems . . . . . . .

  20. Underfloor air distribution systems: Benefits and when to use the system in building design

    SciTech Connect (OSTI)

    McCarry, B.T. [Keen Engineering Co., Ltd., Vancouver, British Columbia (Canada)

    1995-12-31

    Underfloor air distribution systems are a viable option for mechanical system building design. They are comprised of raised floor panels with a supply air plenum in the void between the raised floor and the concrete structure. Supply air grilles are flush mounted to the floor to create a flat floor and walking surface. The engineering challenge is to determine when to use underfloor air distribution systems and how to effectively apply them. The best places to use this system are in owner-occupied buildings with a high churn rate and/or frequent technology changes. The benefits of this system include fresh air at the level where building occupants are located, forgiveness for variations in internal cooling loads, easy relocation of the supply air grilles to suit revised layouts, a reduction in energy costs for the mechanical system, and an improvement in indoor air quality.

  1. Implications of Low Particulate Matter Emissions on System Fuel Efficiency for High Efficiency Clean Combustion

    SciTech Connect (OSTI)

    Parks, II, James E; Prikhodko, Vitaly Y

    2009-01-01

    Advanced diesel combustion regimes such as High Efficiency Clean Combustion (HECC) offer the benefits of reduced engine out NOX and particulate matter (PM) emissions. Lower PM emissions during advanced combustion reduce the demand on diesel particulate filters (DPFs) and can, thereby, reduce the fuel penalty associated with DPF regeneration. In this study, a SiC DPF was loaded and regenerated on a 1.7-liter 4-cylinder diesel engine operated in conventional and advanced combustion modes at different speed and load conditions. A diesel oxidation catalyst (DOC) and a lean NOX trap (LNT) were also installed in the exhaust stream. Five steady-state speed and load conditions were weighted to estimate Federal Test Procedure (FTP) fuel efficiency. The DPF was loaded using lean-rich cycling with frequencies that resulted in similar levels of NOX emissions downstream of the LNT. The pressure drop across the DPF was measured at a standard point (1500 rpm, 5.0 bar) before and after loading, and a P rise rate was determined for comparison between conventional and advanced combustion modes. Higher PM emissions in conventional combustion resulted in a higher rate of backpressure rise across the DPF at all of the load points leading to more frequent DPF regenerations and higher fuel penalty. The fuel penalty during conventional combustion was 4.2% compared with 3.1% for a mixture of conventional and advanced modes.

  2. Some characteristics of emerging distribution systems considering the smart grid initiative

    SciTech Connect (OSTI)

    Brown, Hilary E.; Suryanarayanan, Siddharth; Heydt, Gerald T.

    2010-06-15

    Modernization of the electric power system in the United States is driven by the Smart Grid Initiative. Many changes are planned in the coming years to the distribution side of the U.S. electricity delivery infrastructure to embody the idea of ''smart distribution systems.'' However, no functional or technical definition of a smart distribution system has yet been accepted by all. (author)

  3. Mobile Sensor Networks for Leak and Backflow Detection in Water Distribution Systems

    E-Print Network [OSTI]

    Shihada, Basem

    Mobile Sensor Networks for Leak and Backflow Detection in Water Distribution Systems M. Agumbe detection are essential aspects of Water Distribution System (WDS) monitoring. Most existing solutions for leak detection in water distribution systems focus on the placement of expensive static sensors located

  4. An Extensible Framework for Annotation-based Parameter Passing in Distributed Object Systems

    E-Print Network [OSTI]

    Ryder, Barbara G.

    An Extensible Framework for Annotation-based Parameter Passing in Distributed Object Systems Sriram Programming Copyright 2008, Sriram Gopal #12;An Extensible Framework for Annotation-based Parameter Passing in Distributed Object Systems Sriram Gopal (ABSTRACT) Modern distributed object systems pass remote parameters

  5. Aalborg Universitet Agent-based distributed hierarchical control of dc microgrid systems

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    Aalborg Universitet Agent-based distributed hierarchical control of dc microgrid systems Meng, J. M., & Dragicevic, T. (2014). Agent-based distributed hierarchical control of dc microgrid systems-BASED DISTRIBUTED HIERARCHICAL CONTROL OF DC MICROGRID SYSTEMS Lexuan Meng, Tomislav Dragicevic, Josep M. Guerrero

  6. The SAL Interpreter for Large-Scale Optimization in Distributed Control Systems

    E-Print Network [OSTI]

    Bailey-Kellogg, Chris

    The SAL Interpreter for Large-Scale Optimization in Distributed Control Systems Christopher Bailey sensor-rich control systems interact with spa- tially distributed physical environments. This paper interpretation and control tasks for distributed physical systems. SAL provides a set of powerful, abstract com

  7. PADS: A Policy Architecture for Distributed Storage Systems Nalini Belaramani, Jiandan Zheng, Amol Nayate, Robert Soule,

    E-Print Network [OSTI]

    Grimm, Robert

    PADS: A Policy Architecture for Distributed Storage Systems Nalini Belaramani, Jiandan Zheng§, Amol for build- ing distributed storage systems. A policy architecture has two aspects. First, a common set for how policies, them- selves, should be specified. In the case of distributed storage systems, PADS

  8. Tree-structured Data Regeneration with Network Coding in Distributed Storage Systems

    E-Print Network [OSTI]

    Li, Baochun

    Tree-structured Data Regeneration with Network Coding in Distributed Storage Systems Jun Li, Shuang of Toronto, Canada bli@eecg.toronto.edu Abstract--Distributed storage systems, built on peer-to-peer networks influence the data reliability and availability of distributed storage systems. It has been ac- knowledged

  9. Aalborg Universitet Energy Management System with Equalization Algorithm for Distributed Energy

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    Aalborg Universitet Energy Management System with Equalization Algorithm for Distributed Energy for Distributed Energy Storage Systems in PV-Active Generator Based Low Voltage DC Microgrids. In IEEE ICDCM 2015 for Distributed Energy Storage Systems in PV-Active Generator Based Low Voltage DC Microgrids Nelson L. D

  10. Energy-Efficient Dry-Type Distribution Transformers: New Opportunities to Cut Energy Bills and Lock-in Long-Term Energy Savings 

    E-Print Network [OSTI]

    deLaski, A.; Suozzo, M.

    1998-01-01

    Nearly 90% of the electricity that powers the industrial sector flows through dry-type distribution transformers. These transformers are very efficient- most convert in excess of 95% of input power to output power. However, ...

  11. Improving Energy Efficiency of Compressed Air System Based onSystem Audit

    SciTech Connect (OSTI)

    Shanghai, Hongbo Qin; McKane, Aimee

    2007-06-01

    Industrial electric motor systems consume more than 600billion kWh annually, accounting for more than 50 percent of China selectricity use. The International Energy Agency estimates thatoptimizing motor systems results in an improvement of 20-25 percent,which is well-supported by experience in both the U.S. and China.Compressed air systems in China use 9.4 percent of all electricity.Compressed air use in China is growing rapidly, as new industrial plantsare built and the production processes of existing plants expand andchange. Most of these systems, whether existing or new, are not optimizedfor energy efficiency. This paper will present a practitioner'sperspective on theemergence of compressed air auditing services inChina, specifically as it pertains to Shanghai and surrounding areas.Both the methodology used and the market development of these compressedair system services will be addressed. Finally, the potential for energysaving opportunities will be described based on highlights from over 50compressed air system energy audits completed by Shanghai EnergyConservation Service Center, both during the United Nations IndustrialDevelopment Organization (UNIDO) China Motor System Energy ConservationProgram, and after this training program was completed.

  12. Biological optimization systems for enhancing photosynthetic efficiency and methods of use

    DOE Patents [OSTI]

    Hunt, Ryan W.; Chinnasamy, Senthil; Das, Keshav C.; de Mattos, Erico Rolim

    2012-11-06

    Biological optimization systems for enhancing photosynthetic efficiency and methods of use. Specifically, methods for enhancing photosynthetic efficiency including applying pulsed light to a photosynthetic organism, using a chlorophyll fluorescence feedback control system to determine one or more photosynthetic efficiency parameters, and adjusting one or more of the photosynthetic efficiency parameters to drive the photosynthesis by the delivery of an amount of light to optimize light absorption of the photosynthetic organism while providing enough dark time between light pulses to prevent oversaturation of the chlorophyll reaction centers are disclosed.

  13. The Echo Distributed File System Andrew D. Birrell, Andy Hisgen, Chuck Jerian,

    E-Print Network [OSTI]

    Chin, Shiu-Kai

    . All rights reserved. #12;The Echo Distributed File System · 1 WHAT AND WHY? One of the holy grails systems with the virtues of distributed and personal computer systems. This grail is all the harder to capture the file system portion of this grail. We thought of the Echo file system as a crucial first piece

  14. Performance Evaluation of Hot Water Efficiency Plumbing System Using Thermal Valve 

    E-Print Network [OSTI]

    Cha, K. S.; Park, M. S.; Seo, H. Y.

    2010-01-01

    In Korea two popular water distribution systems—the branch type and the separate type systems—have serious drawbacks. The branch type suffers from temperature instability while the separate type suffers from excessive piping. Neither of them re...

  15. State Research, Outreach, and Technical Assistance to Imrove the Nation's Transmission & Distribution System

    SciTech Connect (OSTI)

    J. Fox; M. Keogh; A. Spahn

    2009-05-20

    The broad purpose of this project was to work cooperatively with the DOE to explore technology nad policy issues associated with more efficient, reliable, and affordable electric transmission and distribution use.

  16. High Quality Down Lighting Luminaire with 73% Overall System Efficiency

    SciTech Connect (OSTI)

    Robert Harrison; Steven C. Allen; Joseph Bernier; Robert Harrison

    2010-08-31

    This report summarizes work to develop a high flux, high efficiency LED-based downlight at OSRAM SYLVANIA under US Department of Energy contract DE-FC26-08NT01582. A new high power LED and electronic driver were developed for these downlights. The LED achieved 100 lumens per watt efficacy and 1700 lumen flux output at a correlated color temperature of 3500K. The driver had 90% electrical conversion efficiency while maintaining excellent power quality with power factor >0.99, and total harmonic distortion <10%. Two styles of downlights using the LED and driver were shown to exceed the project targets for steady-state luminous efficacy and flux of 70 lumens per watt and 1300 lumens, respectively. Compared to similar existing downlights using compact fluorescent or LED sources, these downlights had much higher efficacy at nearly the same luminous flux.

  17. Design of control for efficiency of AUV power systems

    E-Print Network [OSTI]

    Ware, Laura M. (Laura Marie)

    2012-01-01

    The MIT Rapid Development Group designed and built an internal combustion hybrid recharging system for the REMUS 600 Autonomous Underwater Vehicle (AUV) in collaboration with the MIT Lincoln Laboratory. This power system ...

  18. Advanced Klystrons for High Efficiency Accelerator Systems - Final Report

    SciTech Connect (OSTI)

    Read, Michael; Ives, Robert Lawrence

    2014-03-26

    This program explored tailoring of RF pulses used to drive accelerator cavities. Simulations indicated that properly shaping the pulse risetime to match accelerator cavity characteristics reduced reflected power and increased total efficiency. Tailoring the pulse requires a high power, gridded, klystron to shape the risetime while also controlling the beam current. The Phase I program generated a preliminary design of a gridded electron gun for a klystron producing 5-10 MW of RF power. This required design of a segmented cathode using Controlled Porosity Reservoir cathodes to limit power deposition on the grid. The program was successful in computationally designing a gun producing a high quality electron beam with grid control. Additional analysis of pulse tailoring indicated that technique would only be useful for cavity drive pulses that were less than approximately 2-3 times the risetime. Otherwise, the efficiency gained during the risetime of the pulse became insignificant when considering the efficiency over the entire pulse. Consequently, it was determined that a Phase II program would not provide sufficient return to justify the cost. Never the less, other applications for a high power gridded gun are currently being pursued. This klystron, for example, would facilitate development inverse Comptom x-ray sources by providing a high repetition rate (10 -100 kHz) RF source.

  19. Adaptive Techniques for Minimizing Middleware Memory Footprint for Distributed, Real-Time, Embedded Systems

    E-Print Network [OSTI]

    Panahi, Mark; Harmon, Trevor; Klefstad, Raymond

    2003-01-01

    Compilers and Tools for Embedded Systems, pp. 38-45, 2002.Keywords-distributed systems; embedded systems; real-timereal-time, and embedded systems, it should provide a full

  20. IMPROVING THE EFFICIENCY OF AN EXISTING GROUNDWATER REMEDIATION SYSTEM

    E-Print Network [OSTI]

    Illinois at Urbana-Champaign, University of

    Took advantage of available rebates to install solar panels ­ Southern Solar Array: 60 panel system (11.7 kilowatt total) 13 #12;GROUNDWATER SYSTEM ENERGY IMPROVEMENTS ­ Northern Solar Array: 56 panel system (10.9 kilowatt total) 14 #12;ENERGY IMPROVEMENT BENEFITS 15 #12;RETURN ON INVESTMENT: SOLAR PANELS 16 #12

  1. Computationally Efficient Clustering of Power Supplies in Heterogeneous Real Time Systems

    E-Print Network [OSTI]

    Friedman, Eby G.

    functionally diverse systems with multiple power domains. To provide a high quality power delivery system an integrated part of the power management system. To maintain a high quality power supply despite increasingComputationally Efficient Clustering of Power Supplies in Heterogeneous Real Time Systems Inna

  2. Coupled Evaluation of Communication System Loading and ATIS/ATMS Efficiency

    E-Print Network [OSTI]

    Hellinga, Bruce

    Coupled Evaluation of Communication System Loading and ATIS/ATMS Efficiency Bruce Hellinga, Hesham and communication systems. Traditionally, the evaluation of the performance of these communication systems evaluation of the communication system loading and the ATMS/ATIS functions. This extended model is capable

  3. Enhancing Efficiency and Robustness of a Photovoltaic Power System under Partial Shading

    E-Print Network [OSTI]

    Pedram, Massoud

    Enhancing Efficiency and Robustness of a Photovoltaic Power System under Partial Shading Yanzhi}@usc.edu, 2 E-mail: {yhkim, naehyuck}@elpl.snu.ac.kr Abstract Photovoltaic (PV) power systems have been widely.1% to 53.3% compared with the baseline systems. Keywords Photovoltaic system, partial shading, hybrid

  4. A DISTRIBUTED INTELLIGENT AUTOMATED DEMAND RESPONSE BUILDING MANAGEMENT SYSTEM

    SciTech Connect (OSTI)

    Auslander, David; Culler, David; Wright, Paul; Lu, Yan; Piette, Mary

    2013-12-30

    The goal of the 2.5 year Distributed Intelligent Automated Demand Response (DIADR) project was to reduce peak electricity load of Sutardja Dai Hall at UC Berkeley by 30% while maintaining a healthy, comfortable, and productive environment for the occupants. We sought to bring together both central and distributed control to provide “deep” demand response1 at the appliance level of the building as well as typical lighting and HVAC applications. This project brought together Siemens Corporate Research and Siemens Building Technology (the building has a Siemens Apogee Building Automation System (BAS)), Lawrence Berkeley National Laboratory (leveraging their Open Automated Demand Response (openADR), Auto-­Demand Response, and building modeling expertise), and UC Berkeley (related demand response research including distributed wireless control, and grid-­to-­building gateway development). Sutardja Dai Hall houses the Center for Information Technology Research in the Interest of Society (CITRIS), which fosters collaboration among industry and faculty and students of four UC campuses (Berkeley, Davis, Merced, and Santa Cruz). The 141,000 square foot building, occupied in 2009, includes typical office spaces and a nanofabrication laboratory. Heating is provided by a district heating system (steam from campus as a byproduct of the campus cogeneration plant); cooling is provided by one of two chillers: a more typical electric centrifugal compressor chiller designed for the cool months (Nov-­ March) and a steam absorption chiller for use in the warm months (April-­October). Lighting in the open office areas is provided by direct-­indirect luminaries with Building Management System-­based scheduling for open areas, and occupancy sensors for private office areas. For the purposes of this project, we focused on the office portion of the building. Annual energy consumption is approximately 8053 MWh; the office portion is estimated as 1924 MWh. The maximum peak load during the study period was 1175 kW. Several new tools facilitated this work, such as the Smart Energy Box, the distributed load controller or Energy Information Gateway, the web-­based DR controller (dubbed the Central Load-­Shed Coordinator or CLSC), and the Demand Response Capacity Assessment & Operation Assistance Tool (DRCAOT). In addition, an innovative data aggregator called sMAP (simple Measurement and Actuation Profile) allowed data from different sources collected in a compact form and facilitated detailed analysis of the building systems operation. A smart phone application (RAP or Rapid Audit Protocol) facilitated an inventory of the building’s plug loads. Carbon dioxide sensors located in conference rooms and classrooms allowed demand controlled ventilation. The extensive submetering and nimble access to this data provided great insight into the details of the building operation as well as quick diagnostics and analyses of tests. For example, students discovered a short-­cycling chiller, a stuck damper, and a leaking cooling coil in the first field tests. For our final field tests, we were able to see how each zone was affected by the DR strategies (e.g., the offices on the 7th floor grew very warm quickly) and fine-­tune the strategies accordingly.

  5. Probability distributions of some power system reliability indices 

    E-Print Network [OSTI]

    Dip, Minh

    1978-01-01

    of three renewal process Let {N.(t),t>0} denote the i t h renewal process. Thus i f N (t) i s the number of renewals ( f a i l u r e s ) in (0,t) in the pooled process, then: m N D(t) = E N.(t) . (13) " i=l 1 9 10 Khintchine and Gri g e l i o n i...PROBABILITY DISTRIBUTIONS OF SOME POWER SYSTEM RELIABILITY INDICES A Thesis by MINH DIP (DIEP) Submitted to the Graduate College of Texas A&M University in p a r t i a l f u l f i l l m e n t of the requirement f o r the degree of MASTER...

  6. Impact of Utility-Scale Distributed Wind on Transmission-Level System Operations

    SciTech Connect (OSTI)

    Brancucci Martinez-Anido, C.; Hodge, B. M.

    2014-09-01

    This report presents a new renewable integration study that aims to assess the potential for adding distributed wind to the current power system with minimal or no upgrades to the distribution or transmission electricity systems. It investigates the impacts of integrating large amounts of utility-scale distributed wind power on bulk system operations by performing a case study on the power system of the Independent System Operator-New England (ISO-NE).

  7. Aerogel-Based Insulation for Industrial Steam Distribution Systems

    Broader source: Energy.gov [DOE]

    New Efficient Insulation for Pipes Allows for the Use of Less Material with High-Temperature Durability

  8. A Two-Stage Distributed Architecture for Voltage Control in Power Distribution Systems

    E-Print Network [OSTI]

    Hadjicostis, Christoforos

    (PHEVs). These generation and storage resources are commonly referred to as distributed energy resources in distribution networks that relies on controlling reactive power injections provided by distributed energy resources (DERs). A local controller on each bus of the network monitors the bus voltage and, whenever

  9. Fact Sheet: Protecting Intelligent Distributed Power Grids Against...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    distribution, IT networks, and control systems-that use automated data analysis and demand response capabilities to increase system functionality, efficiency, and...

  10. Parallelized Distributed Embedded Control System for 2D Walking Robot for Studying Rough Terrain Locomotion

    E-Print Network [OSTI]

    Strunk, Gavin

    2010-12-10

    , parallelized, embedded control system was developed to provide the control structure for the Jaywalker. This system was chosen for its ability to execute simultaneous tasks efficiently. The two level control system provides a first level to implement a higher...

  11. High Efficiency Engine Systems Development and Evaluation | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum12,ExecutiveFinancing ProgramsDepartment of¡ ¢HelpHigh Efficiency

  12. High Efficiency Engine Systems Development and Evaluation | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum12,ExecutiveFinancing ProgramsDepartment of¡ ¢HelpHigh EfficiencyEnergy 1

  13. Developing Energy Efficient Roof Systems DEERS | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LIST OFAMERICA'SHeavy Electricals Ltd BHELEuropeLage LandenDespatchEfficient Roof

  14. Ultra Efficient Combined Heat, Hydrogen, and Power System

    SciTech Connect (OSTI)

    2010-10-28

    Description of CHHP system which utilizes a high-temperature fuel cell to provide on-site process reducing gas, clean power, and heat.

  15. Project Title: Complete System-Level Efficient and Interoperable...

    Broader source: Energy.gov (indexed) [DOE]

    system and the microgrid by utilizing the most advanced technologies such as controls, power electronics, communication, and multi-objective energy management to fulfill the...

  16. Energy-Efficient Cooling Control Systems for Data Centers | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Recovery and Reinvestment Act), recently demonstrated the effectiveness of intelligent energy management in eight State of California data centers. The system uses a network of...

  17. Ultra Efficient Combined Heat, Hydrogen, and Power System - Fact...

    Broader source: Energy.gov (indexed) [DOE]

    Inc., in collaboration with Abbott Furnace Company, is developing a combined heat, hydrogen, and power (CHHP) system that utilizes reducing gas produced by a high-temperature...

  18. Lean Gasoline System Development for Fuel Efficient Small Car...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    and Vehicle Technologies Program Annual Merit Review and Peer Evaluation ace063smith2011o.pdf More Documents & Publications Lean Gasoline System Development for Fuel...

  19. Implementation and Rejection of Industrial Steam System Energy Efficiency Measures

    E-Print Network [OSTI]

    Therkelesen, Peter

    2014-01-01

    France.   ISO,  2011.  ISO  50001  Energy  management  such   as   ISO   50001   -­?Energy   management   system  2005).  A  principal  goal  of  ISO  50001  is  to  foster  

  20. An Investigation of the Utilization of Smart Meter Data to Adapt Overcurrent Protection for Radial Distribution Systems with a High Penetration of Distributed Generation 

    E-Print Network [OSTI]

    Douglin, Richard Henry

    2012-07-16

    The future of electric power distribution systems (DSs) is one that incorporates extensive amounts of advanced metering, distribution automation, and distributed generation technologies. Most DSs were designed to be radial ...

  1. Energy Aware Paradigm for Energy Efficient ICT: a Systemic Approach Sergio Ricciardi

    E-Print Network [OSTI]

    Politčcnica de Catalunya, Universitat

    Energy Aware Paradigm for Energy Efficient ICT: a Systemic Approach Sergio Ricciardi Technical) Jordi Girona 3 08034 Barcelona, Spain +34 93 4016982 pareta@ac.upc.edu ABSTRACT Energy is imposing as the new constraint in the ICT sector and the problem of energy efficient in ICT has consequently arisen

  2. Efficient Data Migration to Conserve Energy in Streaming Media Storage Systems

    E-Print Network [OSTI]

    Qin, Xiao

    and efficient data migrations to achieve the unbalanced data layouts. Motivation. The primary problemEfficient Data Migration to Conserve Energy in Streaming Media Storage Systems Yunpeng Chai, Zhihui media computing environments due to high data migration overhead. To address this problem, we propose

  3. EFFECTIVE EFFICIENCY AND PERFORMANCE RATIO AS ENERGY RATING SYSTEM FOR PV MODULES Marko Topic1

    E-Print Network [OSTI]

    Sites, James R.

    EFFECTIVE EFFICIENCY AND PERFORMANCE RATIO AS ENERGY RATING SYSTEM FOR PV MODULES Marko Topic1 USA ABSTRACT: PV module energy rating assessment can be expressed by an annual effective efficiency approaches are presented: (i) a more accurate one with hourly averaged data over a year and a model of PV

  4. Improved Power Grid Stability and Efficiency with a Building-Energy Cyber-Physical System

    E-Print Network [OSTI]

    1 Improved Power Grid Stability and Efficiency with a Building-Energy Cyber-Physical System Mary in the context of the power grid and its interaction with buildings. We describe significant issues in energy-efficient, and the building operator was unable to "store energy" before an event occurs or must alter demand only after

  5. Influence of System Characteristics and Scheduling Patterns on Commuter Rail Energy Efficiency

    E-Print Network [OSTI]

    Barkan, Christopher P.L.

    regarded as an effective transportation alternative to reduce energy consumption and emissions in large rail mode. However, operating energy efficiency varies with many factors such as vehicle type, traction1 Influence of System Characteristics and Scheduling Patterns on Commuter Rail Energy Efficiency

  6. Energy-Efficiency and Storage Flexibility in the Blue File System

    E-Print Network [OSTI]

    Fu, Xiaoming

    Energy-Efficiency and Storage Flexibility in the Blue File System Salke HartungSalke Hartung storage, but don`t have energy-efficiency as a prior design goalg g PersonalRAID[4] can be used to keep devices: Adapt easily to performance and energy characteristics of all storage types (local, portable

  7. Snooze: an autonomic and energy-efficient management system for virtualized clusters

    E-Print Network [OSTI]

    Lefčvre, Laurent

    Snooze: an autonomic and energy-efficient management system for virtualized clusters Eugen Feller, autonomic and energy-efficient virtual machine management framework for private clouds Developed within the French ANR EcoGrappe project (Energy Consumption Management in Clusters) by Eugen Feller during his Ph

  8. Energy Efficiency: The New Holy Grail of Data Management Systems Research

    E-Print Network [OSTI]

    Liskov, Barbara

    Energy Efficiency: The New Holy Grail of Data Management Systems Research Stavros Harizopoulos HP energy-friendly hardware. Despite the growing body of research in power management techniques, there has been little work to date on energy efficiency from a data management software per- spective

  9. Cybersecurity through Real-Time Distributed Control Systems

    SciTech Connect (OSTI)

    Kisner, Roger A; Manges, Wayne W; MacIntyre, Lawrence Paul; Nutaro, James J; Munro Jr, John K; Ewing, Paul D; Howlader, Mostofa; Kuruganti, Phani Teja; Wallace, Richard M; Olama, Mohammed M

    2010-04-01

    Critical infrastructure sites and facilities are becoming increasingly dependent on interconnected physical and cyber-based real-time distributed control systems (RTDCSs). A mounting cybersecurity threat results from the nature of these ubiquitous and sometimes unrestrained communications interconnections. Much work is under way in numerous organizations to characterize the cyber threat, determine means to minimize risk, and develop mitigation strategies to address potential consequences. While it seems natural that a simple application of cyber-protection methods derived from corporate business information technology (IT) domain would lead to an acceptable solution, the reality is that the characteristics of RTDCSs make many of those methods inadequate and unsatisfactory or even harmful. A solution lies in developing a defense-in-depth approach that ranges from protection at communications interconnect levels ultimately to the control system s functional characteristics that are designed to maintain control in the face of malicious intrusion. This paper summarizes the nature of RTDCSs from a cybersecurity perspec tive and discusses issues, vulnerabilities, candidate mitigation approaches, and metrics.

  10. Power-Aware Autonomous Distributed Storage Systems for Internet Hosting Service Platforms

    E-Print Network [OSTI]

    Banbara, Mutsunori

    percentage of the total computing system's energy is used by the data storage systems, various attemptsPower-Aware Autonomous Distributed Storage Systems for Internet Hosting Service Platforms Jumpei@osss.,hasebe@,kato@}cs.tsukuba.ac.jp Abstract. We present a power-saving method for large-scale distributed storage systems of Internet hosting

  11. Continuous-time Proportional-Integral Distributed Optimization for Networked Systems

    E-Print Network [OSTI]

    Egerstedt, Magnus

    Continuous-time Proportional-Integral Distributed Optimization for Networked Systems Greg Drogea1;Continuous-time Proportional-Integral Distributed Optimization for Networked Systems Greg Droge and Hiroaki these methods to develop a continuous-time proportional-integral distributed optimization method. Furthermore

  12. Distributed Solar PV for Electricity System Resiliency: Policy and Regulatory Considerations (Brochure)

    SciTech Connect (OSTI)

    Not Available

    2014-11-01

    Distributed Solar PV systems have the potential of increasing the grid's resiliency to unforeseen events, such as extreme weather events and attacks. This paper presents the role that distributed PV can play in electric grid resiliency, introduces basic system design requirements and options, and discusses the regulatory and policy options for supporting the use of distributed PV for the purpose of increased electricity resiliency.

  13. Contract-Based Load Management in Federated Distributed Systems Magdalena Balazinska, Hari Balakrishnan, and Mike Stonebraker

    E-Print Network [OSTI]

    Contract-Based Load Management in Federated Distributed Systems Magdalena Balazinska, Hari://nms.lcs.mit.edu/projects/medusa/ Abstract This paper focuses on load management in loosely- coupled federated distributed systems. We in practice. Our load management mechanism is especially well- suited for distributed stream

  14. ContractBased Load Management in Federated Distributed Systems # Magdalena Balazinska, Hari Balakrishnan, and Mike Stonebraker

    E-Print Network [OSTI]

    Contract­Based Load Management in Federated Distributed Systems # Magdalena Balazinska, Hari://nms.lcs.mit.edu/projects/medusa/ Abstract This paper focuses on load management in loosely­ coupled federated distributed systems. We in practice. Our load management mechanism is especially well­ suited for distributed stream

  15. Ceph: A Scalable, High-Performance Distributed File System

    E-Print Network [OSTI]

    Weil, Sage; Brandt, Scott A; Miller, Ethan L; Long, Darrell D. E.; Maltzahn, Carlos

    2006-01-01

    allocation ta- bles with a pseudo-random data distribution function (allocation tables and replacing them with gen- erating functions.

  16. High Efficiency, Ultra-Low Emission, Integrated Process Heater System

    SciTech Connect (OSTI)

    Mason, Howard; Boral, Anindya; Chhotray, San; Martin, Matthew

    2006-06-19

    The team of TIAX LLC, ExxonMobil Research and Engineering Company, and Callidus Technologies, LLC conducted a six-year program to develop an ultra-low emission process heater burner and an advanced high efficiency heater design. This project addresses the critical need of process heater operators for reliable, economical emission reduction technologies to comply with stringent emission regulations, and for heater design alternatives that reduce process heater energy requirements without significant cost increase. The key project targets were NOx emissions of 10 ppm (@ 3% O2), and a heater thermal efficiency of 95 percent. The ultra low NOx burner was developed through a series of pilot-scale and field tests combined with computational fluid dynamic modeling to arrive at simultaneous low emissions and suitable flame shape and stability. Pilot scale tests were run at TIAX, at the 2 MMBtu/hr scale, and at Callidus at 8 MMBtu/hr. The full scale burner was installed on a 14 burner atmospheric pipestill furnace at an ExxonMobil refinery. A variety of burner configurations, gas tips and flame stabilizers were tested to determine the lowest emissions with acceptable flame shape and stability. The resulting NOx emissions were 22 ppm on average. Starting in 2001, Callidus commercialized the original ultra low NOx burner and made subsequent design improvements in a series of commercial burners evolving from the original concept and/or development. Emissions in the field with the ultra low-NOx burner over a broad spectrum of heater applications have varied from 5 ppm to 30 ppm depending on heater geometry, heater service, fuel and firing capacity. To date, 1550 of the original burners, and 2500 of subsequent generation burners have been sold by Callidus. The advanced heater design was developed by parametric evaluations of a variety of furnace and combustion air preheater configurations and technologies for enhancing convective and radiative heat transfer. The design evolution relied heavily on computational fluid dynamic predictions of design alternatives. The final design features modular separate radiant cells, each with one and two-side fired vertical tubes. The convection section configuration is vertical tube banks enclosed in the radiant channels. Commercial modular plate air preheaters are used. The predicted performance for the integrated advanced heater and Callidus burner is 95 percent efficiency with 9 ppm NOx emissions firing natural gas, and 12 ppm firing refinery gas. The total erected cost is less than a conventional heater with combustion air preheat.

  17. An Efficient Rescaled Perceptron Algorithm for Conic Systems

    E-Print Network [OSTI]

    Vempala, Santosh

    The classical perceptron algorithm is an elementary row-action/relaxation algorithm for solving a homogeneous linear inequality system Ax > 0. A natural condition measure associated with this algorithm is the Euclidean ...

  18. Improving the Water Efficiency of Cooling Production System 

    E-Print Network [OSTI]

    Maheshwari, G.; Al-Hadban, Y.; Al-Taqi, H. H.; Alasseri, R.

    2010-01-01

    For most of the time, cooling towers (CTs) of cooling systems operate under partial load conditions and by regulating the air circulation with a variable frequency drive (VFD), significant reduction in the fan power can be achieved. In Kuwait...

  19. Energy efficient scheduling techniques for real-time embedded systems 

    E-Print Network [OSTI]

    Prathipati, Rajesh Babu

    2004-09-30

    and incorporate more functionality, they became more power-hungry. Thus, reducing power consumption and extending battery lifespan while guaranteeing the timing constraints has became a critical aspect in designing such systems. This gives rise to three aspects...

  20. Transmural Catalysis - High Efficiency Catalyst Systems for NOx...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Systems for NOx Adsorbers and SCR Presentation given at DEER 2006, August 20-24, 2006, Detroit, Michigan. Sponsored by the U.S. DOE's EERE FreedomCar and Fuel Partnership and 21st...