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


1

Power conversion apparatus and method  

DOE Patents (OSTI)

A power conversion apparatus includes an interfacing circuit that enables a current source inverter to operate from a voltage energy storage device (voltage source), such as a battery, ultracapacitor or fuel cell. The interfacing circuit, also referred to as a voltage-to-current converter, transforms the voltage source into a current source that feeds a DC current to a current source inverter. The voltage-to-current converter also provides means for controlling and maintaining a constant DC bus current that supplies the current source inverter. The voltage-to-current converter also enables the current source inverter to charge the voltage energy storage device, such as during dynamic braking of a hybrid electric vehicle, without the need of reversing the direction of the DC bus current.

Su, Gui-Jia (Knoxville, TN)

2012-02-07T23:59:59.000Z

2

Automotive Waste Heat Conversion to Power Program  

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

or otherwise restricted information Project ID ace47lagrandeur Automotive Waste Heat Conversion to Power Program- 2009 Hydrogen Program and Vehicle Technologies Program...

3

Automotive Waste Heat Conversion to Power Program  

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

Start Date: Oct '04 Program End date: Oct '10 Percent Complete: 80% 2 Automotive Waste Heat Conversion to Power Program- Vehicle Technologies Program Annual Merit Review- June...

4

Project Profile: Brayton Solar Power Conversion System  

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

Brayton Energy, under the CSP R&D FOA, is looking to demonstrate the viability and economics of a new concentrating solar thermal power conversion system.

5

Advanced, High Power, Next Scale, Wave Energy Conversion Device...  

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

Advanced, High Power, Next Scale, Wave Energy Conversion Device Advanced, High Power, Next Scale, Wave Energy Conversion Device Advanced, High Power, Next Scale, Wave Energy...

6

Power Conversion APEX Interim Report November, 1999  

E-Print Network (OSTI)

, the combined efficiency of the topping cycle and bottoming cycle will be less than the single cycle along. POWER CONVERSION 17.1 Steam Cycle Different steam cycles have been well developed. A study by EPRI summarized the various advanced steam cycles which maybe available for an advanced coal power plant

California at Los Angeles, University of

7

Battery Chargers | Electrical Power Conversion and Storage  

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

Battery Chargers | Electrical Power Conversion and Storage Battery Chargers | Electrical Power Conversion and Storage 625 West A Street | Lincoln, NE 68522-1794 | LesterElectrical.com P: 402.477.8988 | F: 402.441.3727, 402.474.1769 (Sales) MEMORANDUM TO: United States Department of Energy (DOE), Via Email, expartecommunications@hq.doe.gov FROM: Spencer Stock, Product Marketing Manager, Lester Electrical DATE: June 18, 2012 RE: Ex Parte Communications, Docket Number EERE-2008-BT-STD-0005, RIN 1904-AB57 On Monday, June 11, 2012, representatives from Lester Electrical and Ingersoll Rand met with DOE to discuss the Notice of Proposed Rulemaking (NOPR) for Energy Conservation Standards for Battery Chargers and External Power Supplies, Docket Number EERE-2008-BT-STD-0005, RIN 1904-AB57.

8

Structural power flow measurement  

SciTech Connect

Previous investigations of structural power flow through beam-like structures resulted in some unexplained anomalies in the calculated data. In order to develop structural power flow measurement as a viable technique for machine tool design, the causes of these anomalies needed to be found. Once found, techniques for eliminating the errors could be developed. Error sources were found in the experimental apparatus itself as well as in the instrumentation. Although flexural waves are the carriers of power in the experimental apparatus, at some frequencies longitudinal waves were excited which were picked up by the accelerometers and altered power measurements. Errors were found in the phase and gain response of the sensors and amplifiers used for measurement. A transfer function correction technique was employed to compensate for these instrumentation errors.

Falter, K.J.; Keltie, R.F.

1988-12-01T23:59:59.000Z

9

Automotive Waste Heat Conversion to Electric Power using Skutterudites...  

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

Waste Heat Conversion to Electric Power using Skutterudites, TAGS, PbTe and Bi2Te3 Automotive Waste Heat Conversion to Electric Power using Skutterudites, TAGS, PbTe and Bi2Te3...

10

Thermal Sciences The thermal sciences area involves the study of energy conversion and transmission, power  

E-Print Network (OSTI)

Thermal Sciences The thermal sciences area involves the study of energy conversion and transmission in virtually all energy conversion devices and systems. One may think of the jet engine as a mechanical device, power generation, the flow of liquids and gases, and the transfer of thermal energy (heat) by means

New Hampshire, University of

11

Analysis and design of high frequency link power conversion systems for fuel cell power conditioning  

E-Print Network (OSTI)

In this dissertation, new high frequency link power conversion systems for the fuel cell power conditioning are proposed to improve the performance and optimize the cost, size, and weight of the power conversion systems. The first study proposes a...

Song, Yu Jin

2005-11-01T23:59:59.000Z

12

Automotive Waste Heat Conversion to Power Program | Department...  

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

-- Washington D.C. ace47lagrandeur.pdf More Documents & Publications Automotive Waste Heat Conversion to Power Program 2008 DOE FCVT Merit Review: BSST Waste Heat Recovery...

13

Conversion Tower for Dispatchable Solar Power: High-Efficiency Solar-Electric Conversion Power Tower  

SciTech Connect

HEATS Project: Abengoa Solar is developing a high-efficiency solar-electric conversion tower to enable low-cost, fully dispatchable solar energy generation. Abengoa’s conversion tower utilizes new system architecture and a two-phase thermal energy storage media with an efficient supercritical carbon dioxide (CO2) power cycle. The company is using a high-temperature heat-transfer fluid with a phase change in between its hot and cold operating temperature. The fluid serves as a heat storage material and is cheaper and more efficient than conventional heat-storage materials, like molten salt. It also allows the use of a high heat flux solar receiver, advanced high thermal energy density storage, and more efficient power cycles.

None

2012-01-11T23:59:59.000Z

14

Thermal energy conversion to motive power  

SciTech Connect

Performance evaluations of both ideal and actual organic Rankine cycle (ORC) and steam Rankine cycles (SRC) are presented for systems that may be candidates for Solar Total Energy Systems (STES). Many organic fluids and heat engines (turbines or expanders) are being developed; therefore, performance of a few representative ORCs are evaluated. The electrical power outputs range from several kW to <10 MW with maximum cycle temperatures of 482/sup 0/C (900 F). Conclusions from basic Rankine cycle analyses are that the Carnot cycle concept should not be used as a standard of comparison for different cycle fluids, even when they are operating at the same inlet and exhaust temperatures. The ideal Rankine cycle with the maximum conversion efficiency, when based on exact physical properties of fluids, should provide a better standard for actual cycles. Three sets of maximum (ideal) Rankine cycle efficiency (n/sub r/) curves are estimated for steam and several organic fluids for exhaust temperatures of 38/sup 0/C, 100/sup 0/C, and 149/sup 0/C (100 F, 212 F, and 300F). These curves of n/sub r/ versus peak temperature at the expander inlet are referred to as Criterion Curves for basic Rankine cycles, in which corresponding inlet pressures are selected such that n/sub r/ will be a maximum. Basic cycle efficiencies indicate some fluids preferred for solar total energy applications.

Meador, J.T.

1980-01-01T23:59:59.000Z

15

Effect of electron flow on the ordinary-extraordinary mode conversion  

SciTech Connect

Ordinary-extraordinary mode conversion in the electron cyclotron frequency range is revisited in the presence of a flowing electron component. The analytical expressions of optimal parallel refraction index and conversion efficiency are obtained from a one-dimensional cold plasma model. The presence of flowing electrons leads to an outward shift of the conversion layer and therefore increases the optimal value of parallel refraction index. If this effect is not considered, the efficiency of mode conversion degenerates. In typical tokamak plasmas, this degeneration is about a few percentages, which may induce the reflection of several tens of kilowatts of power from the cutoff layer when injecting megawatts of ECRF power into fusion plasma.

Jia Guozhang [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China); Gao Zhe [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China) and Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031 (China)

2011-10-15T23:59:59.000Z

16

Fabrication and testing of an infrared spectral control component for thermophotovoltaic power conversion applications  

E-Print Network (OSTI)

Thermophotovoltaic (TPV) power conversion is the direct conversion of thermal radiation to electricity. Conceptually, TPV power conversion is a very elegant means of energy conversion. A thermal source emits a radiative ...

O'Sullivan, Francis M. (Francis Martin), 1980-

2004-01-01T23:59:59.000Z

17

Power conversion architecture for grid interface at high switching frequency  

E-Print Network (OSTI)

This paper presents a new power conversion architecture for single-phase grid interface. The proposed architecture is suitable for realizing miniaturized ac-dc converters operating at high frequencies (HF, above 3 MHz) and ...

Lim, Seungbum

18

Control strategies for supercritical carbon dioxide power conversion systems  

E-Print Network (OSTI)

The supercritical carbon dioxide (S-C02) recompression cycle is a promising advanced power conversion cycle which couples well to numerous advanced nuclear reactor designs. This thesis investigates the dynamic simulation ...

Carstens, Nathan, 1978-

2007-01-01T23:59:59.000Z

19

Automotive Waste Heat Conversion to Power Program  

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

Emissions Reduction (DEER) Conference (presentation) - "Status of a Cylindrical Waste Heat Power Generator for Vehicles Development Program", J. LaGrandeur, L. Bell, D. Crane *...

20

Microturbine Power Conversion Technology Review, April 2003  

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

A technology review to assess the market for power electronic converters to connect microturbines to the electric grid or local loads.

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


21

E-Print Network 3.0 - active power flow Sample Search Results  

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

Energy Storage, Conversion and Utilization 8 IEEE INFOCOM 2000 1 Effortlimited Fair (ELF) Scheduling for Wireless Summary: on each flow using a per-flow power factor setting. The...

22

Apparatus and method for pyroelectric power conversion  

DOE Patents (OSTI)

Apparatus and method for converting heat to electrical energy by the use of one or more capacitors having temperature dependent capacitance. The capacitor is cycled between relatively high and relatively low temperatures by successive thermal contact with relatively high and relatively low temperature portions of a heat transfer medium having a temperature gradient therein. Upon heating of the capacitor, the capacitance thereof is reduced, so that a charge therein is caused to expand into associated external circuitry in which it is available to do electrical work. The capacitor is then cooled and recharged and the cycle is repeated. The electrical output of the capacitor results from the regenerative delivery of heat to and removal of heat from the capacitor by the heat transfer medium, and efficient conversion of heat to electric energy is thereby effected.

Olsen, Randall B. (Olivenhain, CA)

1984-01-01T23:59:59.000Z

23

Energy Conversion Advanced Heat Transport Loop and Power Cycle  

SciTech Connect

The Department of Energy and the Idaho National Laboratory are developing a Next Generation Nuclear Plant (NGNP) to serve as a demonstration of state-of-the-art nuclear technology. The purpose of the demonstration is two fold 1) efficient low cost energy generation and 2) hydrogen production. Although a next generation plant could be developed as a single-purpose facility, early designs are expected to be dual-purpose. While hydrogen production and advanced energy cycles are still in its early stages of development, research towards coupling a high temperature reactor, electrical generation and hydrogen production is under way. Many aspects of the NGNP must be researched and developed in order to make recommendations on the final design of the plant. Parameters such as working conditions, cycle components, working fluids, and power conversion unit configurations must be understood. Three configurations of the power conversion unit were demonstrated in this study. A three-shaft design with 3 turbines and 4 compressors, a combined cycle with a Brayton top cycle and a Rankine bottoming cycle, and a reheated cycle with 3 stages of reheat were investigated. An intermediate heat transport loop for transporting process heat to a High Temperature Steam Electrolysis (HTSE) hydrogen production plant was used. Helium, CO2, and an 80% nitrogen, 20% helium mixture (by weight) were studied to determine the best working fluid in terms cycle efficiency and development cost. In each of these configurations the relative component size were estimated for the different working fluids. The relative size of the turbomachinery was measured by comparing the power input/output of the component. For heat exchangers the volume was computed and compared. Parametric studies away from the baseline values of the three-shaft and combined cycles were performed to determine the effect of varying conditions in the cycle. This gives some insight into the sensitivity of these cycles to various operating conditions as well as trade offs between efficiency and capital cost. Prametric studies were carried out on reactor outlet temperature, mass flow, pressure, and turbine cooling. Recommendations on the optimal working fluid for each configuration were made. A steady state model comparison was made with a Closed Brayton Cycle (CBC) power conversion system developed at Sandia National Laboratory (SNL). A preliminary model of the CBC was developed in HYSYS for comparison. Temperature and pressure ratio curves for the Capstone turbine and compressor developed at SNL were implemented into the HYSYS model. A comparison between the HYSYS model and SNL loop demonstrated power output predicted by HYSYS was much larger than that in the experiment. This was due to a lack of a model for the electrical alternator which was used to measure the power from the SNL loop. Further comparisons of the HYSYS model and the CBC data are recommended. Engineering analyses were performed for several configurations of the intermediate heat transport loop that transfers heat from the nuclear reactor to the hydrogen production plant. The analyses evaluated parallel and concentric piping arrangements and two different working fluids, including helium and a liquid salt. The thermal-hydraulic analyses determined the size and insulation requirements for the hot and cold leg pipes in the different configurations. Economic analyses were performed to estimate the cost of the va

Oh, C. H.

2006-08-01T23:59:59.000Z

24

Innovative biomass to power conversion systems based on cascaded supercritical CO2 Brayton cycles  

Science Journals Connector (OSTI)

Abstract In the small to medium power range the main technologies for the conversion of biomass sources into electricity are based either on reciprocating internal combustion or organic Rankine cycle engines. Relatively low energy conversion efficiencies are obtained in both systems due to the thermodynamic losses in the conversion of biomass into syngas in the former, and to the high temperature difference in the heat transfer between combustion gases and working fluid in the latter. The aim of this paper is to demonstrate that higher efficiencies in the conversion of biomass sources into electricity can be obtained using systems based on the supercritical closed CO2 Brayton cycles (s-CO2). The s-CO2 system analysed here includes two cascaded supercritical CO2 cycles which enable to overcome the intrinsic limitation of the single cycle in the effective utilization of the whole heat available from flue gases. Both part-flow and simple supercritical CO2 cycle configurations are considered and four boiler arrangements are investigated to explore the thermodynamic performance of such systems. These power plant configurations, which were never explored in the literature for biomass conversion into electricity, are demonstrated here to be viable options to increase the energy conversion efficiency of small-to-medium biomass fired power plants. Results of the optimization procedure show that a maximum biomass to electricity conversion efficiency of 36% can be achieved using the cascaded configuration including a part flow topping cycle, which is approximately 10%-points higher than that of the existing biomass power plants in the small to medium power range.

Giovanni Manente; Andrea Lazzaretto

2014-01-01T23:59:59.000Z

25

Turbine layout for and optimization of solar chimney power conversion units.  

E-Print Network (OSTI)

??ENGLISH ABSTRACT: The power conversion unit of a large solar chimney power plant converts the fluid power, first into mechanical power, and then into electrical… (more)

Fluri, Thomas Peter

2008-01-01T23:59:59.000Z

26

Direct conversion nuclear reactor space power systems  

SciTech Connect

This paper presents the results of a study of space nuclear reactor power systems using either thermoelectric or thermionic energy converters. An in-core reactor design and two heat pipe cooled out-of-core reactor designs were considered. One of the out-of-core cases utilized, long heat pipes (LHP) directly coupled to the energy converter. The second utilized a larger number of smaller heat pipes (mini-pipe) radiatively coupled to the energy converter. In all cases the entire system, including power conditioning, was constrained to be launched in a single shuttle flight. Assuming presently available performance, both the LHP thermoelectric system and minipipe thermionic system, designed to produce 100 kWe for seven years, would have a specific mass near 22kg/kWe. The specific mass of the thermionic minipipe system designed for a one year mission is 165 kg/kWe due to less fuel swelling. Shuttle imposed growth limits are near 300 kWe and 1.2 MWe for the thermoelectric and thermionic systems, respectively. Converter performance improvements could double this potential, and over 10 MWe may be possible for very short missions.

Britt, E.J.; Fitzpatrick, G.O.

1982-08-01T23:59:59.000Z

27

E-Print Network 3.0 - alternate power conversion Sample Search...  

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

Since then, energy conversion and power system operation experiments were unified... and energy conversions. In modern facilities of energy con- ... Source: Gedra, Thomas - School...

28

Sandia National Laboratories: power flow control system  

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

power flow control system ECIS-Princeton Power Systems, Inc.: Demand Response Inverter On March 19, 2013, in DETL, Distribution Grid Integration, Energy, Energy Surety, Facilities,...

29

Power conversion system design for supercritical carbon dioxide cooled indirect cycle nuclear reactors  

E-Print Network (OSTI)

The supercritical carbon dioxide (S-CO?) cycle is a promising advanced power conversion cycle which couples nicely to many Generation IV nuclear reactors. This work investigates the power conversion system design and ...

Gibbs, Jonathan Paul

2008-01-01T23:59:59.000Z

30

Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems  

E-Print Network (OSTI)

Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems B. Beltran, T. Ahmed power generation in variable speed wind energy conversion systems (VS-WECS). These systems have two variations. Index Terms--Wind energy conversion system, power generation control, sliding mode control

Boyer, Edmond

31

Flow shop scheduling with peak power consumption constraints  

E-Print Network (OSTI)

Mar 29, 2012 ... Flow shop scheduling with peak power consumption constraints ... Keywords: scheduling, flow shop, energy, peak power consumption, integer ...

K. Fang

2012-03-29T23:59:59.000Z

32

Detailed balance limit of power conversion efficiency for organic photovoltaics  

SciTech Connect

A fundamental difference between inorganic photovoltaic (IPV) and organic photovoltaic (OPV) cells is that charges are generated at the interface in OPV cells, while free charges can be generated in the bulk in IPV cells. In OPV cells, charge generation involves intrinsic energy losses to dissociate excitons at the interface between the donor and acceptor. By taking into account the energy losses, we show the theoretical limits of the power conversion efficiency set by radiative recombination of the carriers on the basis of the detailed balance relation between radiation from the cell and black-body radiation.

Seki, Kazuhiko, E-mail: k-seki@aist.go.jp [NRI, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565 (Japan)] [NRI, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565 (Japan); Furube, Akihiro [RIIF, AIST Tsukuba Central 2, Umezono 1-1-1, Tsukuba, Ibaraki 305-8568 (Japan)] [RIIF, AIST Tsukuba Central 2, Umezono 1-1-1, Tsukuba, Ibaraki 305-8568 (Japan); Yoshida, Yuji [RCPVT, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565 (Japan)] [RCPVT, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565 (Japan)

2013-12-16T23:59:59.000Z

33

Observation of Ion-Cyclotron-Frequency Mode-Conversion Flow Drive in Tokamak Plasmas  

SciTech Connect

Strong toroidal flow (V{sub {phi}}) and poloidal flow (V{sub {theta}}) have been observed in D-{sup 3}He plasmas with ion cyclotron range of frequencies (ICRF) mode-conversion (MC) heating on the Alcator C-Mod tokamak. The toroidal flow scales with the rf power P{sub rf} (up to 30 km/s per MW), and is significantly larger than that in ICRF minority heated plasmas at the same rf power or stored energy. The central V{sub {phi}} responds to P{sub rf} faster than the outer regions, and the V{sub {phi}}(r) profile is broadly peaked for r/a{<=}0.5. Localized (0.3{<=}r/a{<=}0.5) V{sub {theta}} appears when P{sub rf}{>=}1.5 MW and increases with power (up to 0.7 km/s per MW). The experimental evidence together with numerical wave modeling suggests a local flow drive source due to the interaction between the MC ion cyclotron wave and {sup 3}He ions.

Lin, Y.; Rice, J. E.; Wukitch, S. J.; Greenwald, M. J.; Hubbard, A. E.; Ince-Cushman, A.; Lin, L.; Porkolab, M.; Reinke, M. L.; Tsujii, N. [Massachusetts Institute of Technology, Plasma Science and Fusion Center, Cambridge, Massachusetts 02139 (United States)

2008-12-05T23:59:59.000Z

34

Thermal power plant efficiency enhancement with Ocean Thermal Energy Conversion  

Science Journals Connector (OSTI)

Abstract In addition to greenhouse gas emissions, coastal thermal power plants would gain further opposition due to their heat rejection distressing the local ecosystem. Therefore, these plants need to enhance their thermal efficiency while reducing their environmental offense. In this study, a hybrid plant based on the principle of Ocean Thermal Energy Conversion was coupled to a 740 MW coal-fired power plant project located at latitude 28°S where the surface to deepwater temperature difference would not suffice for regular OTEC plants. This paper presents the thermodynamical model to assess the overall efficiency gained by adopting an ammonia Rankine cycle plus a desalinating unit, heated by the power plant condenser discharge and refrigerated by cold deep seawater. The simulation allowed us to optimize a system that would finally enhance the plant power output by 25–37 MW, depending on the season, without added emissions while reducing dramatically the water temperature at discharge and also desalinating up to 5.8 million tons per year. The supplemental equipment was sized and the specific emissions reduction was estimated. We believe that this approach would improve the acceptability of thermal and nuclear power plant projects regardless of the plant location.

Rodrigo Soto; Julio Vergara

2014-01-01T23:59:59.000Z

35

Self-oscillating modulators for direct energy conversion audio power amplifiers  

E-Print Network (OSTI)

Self-oscillating modulators for direct energy conversion audio power amplifiers Petar Ljusev1, Denmark Correspondence should be addressed to Petar Ljusev (pl@oersted.dtu.dk) ABSTRACT Direct energy conversion audio power amplifier represents total integration of switching-mode power supply and Class D

36

A bio-inspired approach to enhancing wind power conversion  

Science Journals Connector (OSTI)

The primary objective of this investigation is to develop a new control method for wind turbines that can increase their wind energy capture efficiency. Since the resultant wind turbinesystemdynamics are profoundly nonlinear and coupled with significant uncertainties traditional model-based control is found to be not only structurally complex but also computationally expensive. Here we explore two sets of control algorithms to enhance wind to electrical energy conversion. The first accounts for system nonlinearities and external disturbances by integrating variable structure control with adaptive control. The second accommodates the nonlinearities arising from rotor aerodynamics and pitch (actuation) dynamics as well as external disturbances through a method inspired by a 1st order human memory/learning model. The second method allows direct maximum power coefficient tracking for winds under the rated speed and ensures rated power output for winds over the rated speed. Basically it uses the system current and most recent memorized responses together with past control experience to generate new control actions. Both rotor dynamics and actuation (pitch) dynamics are reflected indirectly through the observed/measured system response at each instant and are embedded within the control mechanism. Thus there is no need for detailed information on the system model or system parameters in the control’s design and implementation. The efficacy of both proposed approaches is analyzed through numerical simulations.

YongDuan Song; WenChuan Cai; Peng Li; YongSheng Hu

2012-01-01T23:59:59.000Z

37

Assessing the Power Generation Solution by Thermal-chemical Conversion of Meat Processing Industry Waste  

Science Journals Connector (OSTI)

Abstract The paper presents a waste to energy conversion solution using a pyro-air-gasification process applied to biodegradable residues from meat processing industry integrated with small scale thermodynamic cycle for power generation. The solution of air- gasification at atmospheric pressure is based on experimental research and engineering computation developed during the study. The input data, such as: waste chemical composition, low/high heating value and proximate analysis, correspond to real waste products, sampled directly from the industrial processing line. Separate drying as first stage pre-treatment and integrated partial drying inside the reactor was used. The syngas low heating value of about 4.3 MJ/Nm3 is insured by its combustible fraction (H2– 12.2%, CO – 19.2%, CH4 – 1.6%). According to syngas composition the thermodynamic cycle was chosen – Otto gas engine. For a given waste feed-in flow considered in our computation of about 110 kg/h the power output obtained is about 50 kWel. The global energy efficiency of the unit is about 15%. The results offer answers to energy recovery waste disposal for residues with characteristics that are not suitable for classic incineration or limit the energy efficiency of the process making it non-economical (the average humidity of the raw waste is about 42% in mass). The research focused on waste to energy conversion process energy efficiency, waste neutralization and power generation.

Cosmin Marculescu; Florin Alexe

2014-01-01T23:59:59.000Z

38

Global energy conversion rate from geostrophic flows into internal lee waves in the deep ocean  

E-Print Network (OSTI)

A global estimate of the energy conversion rate from geostrophic flows into internal lee waves in the ocean is presented. The estimate is based on a linear theory applied to bottom topography at O(1–10) km scales obtained ...

Nikurashin, Maxim

39

Methane-to-hydrogen conversion in a reversible flow filtration combustion reactor at a high pressure  

Science Journals Connector (OSTI)

The noncatalytic process of partial oxidation of methane to syngas in a reversible flow filtration combustion reactor at high pressures has been considered. ... conversion process — the maximum temperature in the...

Yu. M. Dmitrenko; P. A. Klyovan

2013-09-01T23:59:59.000Z

40

A Cascade-Type Global Energy Conversion Diagram Based on Wave–Mean Flow Interactions  

Science Journals Connector (OSTI)

A cascade-type energy conversion diagram is proposed for the purpose of diagnosing the atmospheric general circulation based on wave–mean flow interactions. Mass-weighted isentropic zonal means facilitate the expression of nongeostrophic wave ...

Sachiyo Uno; Toshiki Iwasaki

2006-12-01T23:59:59.000Z

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


41

Magnetic Amplifier for Power Flow Control  

SciTech Connect

GENI Project: ORNL is developing an electromagnet-based, amplifier-like device that will allow for complete control over the flow of power within the electric grid. To date, complete control of power flow within the grid has been prohibitively expensive. ORNL’s controller could provide a reliable, cost-effective solution to this problem. The team is combining two types of pre-existing technologies to assist in flow control, culminating in a prototype iron-based magnetic amplifier. Ordinarily, such a device would require expensive superconductive wire, but the magnetic iron core of ORNL’s device could serve as a low-cost alternative that is equally adept at regulating power flow.

None

2012-02-24T23:59:59.000Z

42

Efficient Power Converters for PV Arrays : Scalable Submodule Power Conversion for Utility-Scale Photovoltaics  

SciTech Connect

Solar ADEPT Project: SolarBridge is developing a new power conversion technique to improve the energy output of PV power plants. This new technique is specifically aimed at large plants where many solar panels are connected together. SolarBridge is correcting for the inefficiencies that occur when two solar panels that encounter different amounts of sun are connected together. In most conventional PV system, the weakest panel limits the energy production of the entire system. That’s because all of the energy collected by the PV system feeds into a single collection point where a central inverter then converts it into useable energy for the grid. SolarBridge has found a more efficient and cost-effective way to convert solar energy, correcting these power differences before they reach the grid.

None

2012-02-23T23:59:59.000Z

43

More Efficient Power Conversion for EVs: Gallium-Nitride Advanced Power Semiconductor and Packaging  

SciTech Connect

Broad Funding Opportunity Announcement Project: Delphi is developing power converters that are smaller and more energy efficient, reliable, and cost-effective than current power converters. Power converters rely on power transistors which act like a very precisely controlled on-off switch, controlling the electrical energy flowing through an electrical circuit. Most power transistors today use silicon (Si) semiconductors. However, Delphi is using semiconductors made with a thin layer of gallium-nitride (GaN) applied on top of the more conventional Si material. The GaN layer increases the energy efficiency of the power transistor and also enables the transistor to operate at much higher temperatures, voltages, and power-density levels compared to its Si counterpart. Delphi is packaging these high-performance GaN semiconductors with advanced electrical connections and a cooling system that extracts waste heat from both sides of the device to further increase the device’s efficiency and allow more electrical current to flow through it. When combined with other electronic components on a circuit board, Delphi’s GaN power transistor package will help improve the overall performance and cost-effectiveness of HEVs and EVs.

None

2010-02-01T23:59:59.000Z

44

Cooling Flows as a Calorimeter of AGN Mechanical Power  

E-Print Network (OSTI)

The assumption that radiative cooling of gas in the centers of galaxy clusters is approximately balanced by energy input from a central supermassive black hole implies that the observed X-ray luminosity of the cooling flow region sets a lower limit on AGN mechanical power. The conversion efficiency of AGN mechanical power into gas heating is uncertain, but we argue that it can be high even in the absence of strong shocks. These arguments inevitably lead to the conclusion that the time averaged mechanical power of AGNs in cooling flows is much higher than the presently observed bolometric luminosity of these objects. The energy balance between cooling losses and AGN mechanical power requires some feedback mechanism. We consider a toy model in which the accretion rate onto a black hole is set by the classic Bondi formula. Application of this model to the best studied case of M87 suggests that accretion proceeds at approximately the Bondi rate down to a few gravitational radii with most of the power (at the level of a few percent of the rest mass) carried away by an outflow.

E. Churazov; R. Sunyaev; W. Forman; H. Boehringer

2002-01-09T23:59:59.000Z

45

Free Flow Power Corporation | Open Energy Information  

Open Energy Info (EERE)

Flow Power Corporation Flow Power Corporation Jump to: navigation, search Name Free Flow Power Corporation Address 239 Causeway St Suite 300 Place Gloucester, Massachusetts Zip 1930 Sector Marine and Hydrokinetic, Ocean Product Massachusetts-based company that has developed a turbine generator designed to extract energy from tides, ocean currents, rivers, streams, canals and conduits. Free Flow has raised some initial funding and is prototype testing in rivers and tanks. Year founded 2007 Number of employees 28 Phone number 978-232-3536 Website http://www.free-flow-power.com Coordinates 37.413962°, -76.526305° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.413962,"lon":-76.526305,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

46

Electronic power conditioning for dynamic power conversion in high-power space systems  

E-Print Network (OSTI)

require power levels above 10 kW, . For high energy levels of short duration, Chemical energy sources are effective choices. Utilizing magnetohydrodynamics (MHD), for example, these systems provide pulse power to their respective loads. And lastly, A...

Hansen, James Michael

1991-01-01T23:59:59.000Z

47

Relation of the second law of thermodynamics to the power conversion of energy fluctuations  

Science Journals Connector (OSTI)

The relation of the second law of thermodynamics to the power conversion of fluctuation energy is analyzed using the master equation of the model for the conversion circuit. The performance equation for independent particles shows that the power-conversion performance is given by the second law both for classical and quantum-effect diodes. The relation of the second law to power-conversion models based on the theoretical and experimental results for diode performance for interacting particles exhibiting manybody, multiparticle, or other anomalous and excess-current effects is examined. The performance equations are derived from the master equation for models for interacting particles to determine the conditions required by the second law for power conversion. These conditions are given in terms of the distribution throughout the power-conversion circuit for all the parameters that determine the particle and multiparticle barrier-crossing probability such as the effective mass and spectral density functions. Circuits for spectroscopic measurements for power-conversion circuits with interacting particles are noted. Using selected experimental values for the diode nonlinearity factors in these circuits, open circuit voltages are computed that are not predicted by the second law of thermodynamics.

Joseph C. Yater

1979-10-01T23:59:59.000Z

48

Abstract: Wind Energy Conversion Systems (WECS) produce fluctuating output power, which may cause voltage fluctuations and  

E-Print Network (OSTI)

Abstract: Wind Energy Conversion Systems (WECS) produce fluctuating output power, which may cause, solar energy conversion, virtual test bed simulation. Preprint Order Number: PE-531EC (02- plying its market-clearing mechanism. This mechanism determines the accepted and unaccepted energy bids

Gross, George

49

Nanoscale Triboelectric-Effect-Enabled Energy Conversion for Sustainably Powering Portable Electronics  

E-Print Network (OSTI)

Nanoscale Triboelectric-Effect-Enabled Energy Conversion for Sustainably Powering Portable , and 128 mW/cm3 , respectively, and an energy conversion efficiency as high as 10-39% has been demonstrated: Harvesting energy from our living environment is an effective approach for sustainable, maintenance

Wang, Zhong L.

50

On thermoelectric power conversion from heat re-circulating combustion systems F. J. Weinberg  

E-Print Network (OSTI)

On thermoelectric power conversion from heat re-circulating combustion systems F. J. Weinberg for the Second Law heat engine cycles the maximum power that can be extracted is independent of layout Fax: 4420 7594 5604 Word count: 3750 Diags. equivalent: 1600 5350 #12;On thermoelectric power

51

DC to DC power conversion module for the all-electric ship  

E-Print Network (OSTI)

The MIT end to end electric ship model is being developed to study competing electric ship designs. This project produced a model of a Power Conversion Module (PCM)- 4, DC-to-DC converter which interfaces with the MIT ...

Gray, Weston L

2011-01-01T23:59:59.000Z

52

Lunar electric power systems utilizing the SP?100 reactor coupled to dynamic conversion systems  

Science Journals Connector (OSTI)

An integration study was performed by Rocketdyne coupling an SP?100 reactor to either a Brayton Stirling or K?Rankine power conversion system. The application was for a surface power system to supply power requirements to a lunar base. A power level of 550 kWe was selected based on the National Aeronautics and Space Administration (NASA) Space Exploration Initiative 90?day study. Reliability studies were initially performed to determine optimum power conversion redundancy. This study resulted in selecting three operating engines and one standby unit. Integration design studies indicated that either of the three power conversion systems could be integrated with the SP?100 reactor. From a performance consideration the Brayton and Stirling mass was approximately 45% higher than the K?Rankine. The K?Rankine radiator area was 45% of the Stirling which in turn was about 40% of the Brayton.

Richard B. Harty; Gregory A. Johnson

1992-01-01T23:59:59.000Z

53

Organic Rankine power conversion subsystem development for the small community solar thermal power system  

SciTech Connect

The development and preliminary test results for an air-cooled, hermetically sealed 20 kW sub E organic Rankine cycle engine/alternator unit for use with point focussing distributed receiver solar thermal power system. A 750 F toluene is the working fluid and the system features a high speed, single-stage axial flow turbine direct-coupled to a permanent magnet alternator. Good performance was achieved with the unit in preliminary tests.

Barber, R.E.; Boda, F.P.

1982-07-01T23:59:59.000Z

54

Flow reversal power limit for the HFBR  

SciTech Connect

The High Flux Beam Reactor (HFBR) is a pressurized heavy water moderated and cooled research reactor that began operation at 40 MW. The reactor was subsequently upgraded to 60 MW and operated at that level for several years. The reactor undergoes a buoyancy-driven reversal of flow in the reactor core following certain postulated accidents. Questions which were raised about the afterheat removal capability during the flow reversal transition led to a reactor shutdown and subsequent resumption of operation at a reduced power of 30 MW. An experimental and analytical program to address these questions is described in this report. The experiments were single channel flow reversal tests under a range of conditions. The analytical phase involved simulations of the tests to benchmark the physical models and development of a criterion for dryout. The criterion is then used in simulations of reactor accidents to determine a safe operating power level. It is concluded that the limit on the HFBR operating power with respect to the issue of flow reversal is in excess of 60 MW. Direct use of the experimental results and an understanding of the governing phenomenology supports this conclusion.

Cheng, L.Y.; Tichler, P.R.

1997-01-01T23:59:59.000Z

55

Distribution Power Flow for Smart Grid Technologies  

SciTech Connect

Smart Grid technologies hold the promise of being able to solve many of the problems currently facing in the electric power industry. However, the large scale deployment of these new technologies has been limited due to an inability to accurately model their effects or to quantify their potential benefits. GridLAB-D is a new open source power system modeling and simulation environment developed by the United States Department of Energy specifically to integrate detailed power systems and end-use models. In order to effectively model the vast array of possible smart grid technologies GridLAB-D was developed as a general simulation environment. This paper describes the basic design concept, the power flow solutions implemented, and a detailed example of the type of analysis that can be performed within the simulation environment in order to support the evaluation of smart grid technologies.

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

2009-03-18T23:59:59.000Z

56

GT-MHR power conversion system: Design status and technical issues  

SciTech Connect

The Modular Helium Reactor (MHR) builds on 30 years of international gas-cooled reactor experience utilizing the unique properties of helium gas coolant, graphite moderator and coated particle fuel. To efficiently utilize the high temperature potential of the MHR, an innovative power conversion system has been developed featuring an intercooled and recuperated gas turbine. The gas turbine replaces a conventional steam turbine and its many auxiliary components. The Power Conversion System converts the thermal energy of the helium directly into electrical energy utilizing a closed Brayton cycle. The Power Conversion System draws on even more years of experience than the MHR: the world`s first closed-cycle plant, fossil fired and utilizing air as working fluid, started operation in Switzerland in 1939. Shortly thereafter, in 1945, the coupling of a closed-cycle plant to a nuclear heat generation system was conceived. Directly coupling the closed-cycle gas turbine concept to a modern, passively safe nuclear reactor opens a new chapter in power generation technology and brings with it various design challenges. Some of these challenges are associated with the direct coupling of the Power Conversion System to a nuclear reactor. Since the primary coolant is also the working fluid, the Power Conversion System has to be designed for reactor radionuclide plateout. As a result, issues like component maintainability and replaceability, and fission product effects on materials must be addressed. Other issues concern the integration of the Power Conversion System components into a single vessel. These issues include the selection of key technologies for the power conversion components such as submerged generator, magnetic bearings, seals, compact heat exchangers, and the overall system layout.

Etzel, K.; Baccaglini, G.; Schwartz, A. [General Atomics, San Diego, CA (United States); Hillman, S.; Mathis, D. [AlliedSignal Aerospace, Tempe, AZ (United States)

1994-12-01T23:59:59.000Z

57

Power Conversion Apparatus and Method for Hybrid Electric and...  

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

promises a significant reduction in inverter cost and volume, plus lower electromagnetic interference (EMI) noise emissions, increased reliability, a higher constant power speed...

58

Advanced, High Power, Next Scale, Wave Energy Conversion Device  

SciTech Connect

The project conducted under DOE contract DE?EE0002649 is defined as the Advanced, High Power, Next Scale, Wave Energy Converter. The overall project is split into a seven?stage, gated development program. The work conducted under the DOE contract is OPT Stage Gate III work and a portion of Stage Gate IV work of the seven stage product development process. The project effort includes Full Concept Design & Prototype Assembly Testing building on our existing PowerBuoy? technology to deliver a device with much increased power delivery. Scaling?up from 150kW to 500kW power generating capacity required changes in the PowerBuoy design that addressed cost reduction and mass manufacturing by implementing a Design for Manufacturing (DFM) approach. The design changes also focused on reducing PowerBuoy Installation, Operation and Maintenance (IO&M) costs which are essential to reducing the overall cost of energy. In this design, changes to the core PowerBuoy technology were implemented to increase capability and reduce both CAPEX and OPEX costs. OPT conceptually envisaged moving from a floating structure to a seabed structure. The design change from a floating structure to seabed structure would provide the implementation of stroke? unlimited Power Take?Off (PTO) which has a potential to provide significant power delivery improvement and transform the wave energy industry if proven feasible.

Mekhiche, Mike [Principal Investigator] [Principal Investigator; Dufera, Hiz [Project Manager] [Project Manager; Montagna, Deb [Business Point of Contact] [Business Point of Contact

2012-10-29T23:59:59.000Z

59

GEOPHYSICAL RESEARCH LETTERS, VOL. ???, XXXX, DOI:10.1029/, Global energy conversion rate from geostrophic flows into  

E-Print Network (OSTI)

GEOPHYSICAL RESEARCH LETTERS, VOL. ???, XXXX, DOI:10.1029/, Global energy conversion rate from estimate of the energy conversion rate from geostrophic flows into internal lee waves in the ocean that linear lee wave theory gives a good prediction of the energy conversion rate at sub-critical and critical

Ferrari, Raffaele

60

Flow-through biological conversion of lignocellulosic biomass  

DOE Patents (OSTI)

The present invention is directed to a process for biologically converting carbohydrates from lignocellulosic biomass comprising the steps of: suspending lignocellulosic biomass in a flow-through reactor, passing a reaction solution into the reactor, wherein the solution is absorbed into the biomass substrate and at least a portion of the solution migrates through said biomass substrate to a liquid reservoir, recirculating the reaction solution in the liquid reservoir at least once to be absorbed into and migrate through the biomass substrate again. The biological converting of the may involve hydrolyzing cellulose, hemicellulose, or a combination thereof to form oligosaccharides, monomelic sugars, or a combination thereof; fermenting oligosaccharides, monomelic sugars, or a combination thereof to produce ethanol, or a combination thereof. The process can further comprise removing the reaction solution and processing the solution to separate the ethanol produced from non-fermented solids.

Herring, Christopher D.; Liu, Chaogang; Bardsley, John

2014-07-01T23:59:59.000Z

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


61

Probabilistic Optimal Power Flow Using Linear Fuzzy Relation.  

E-Print Network (OSTI)

??Optimal Power Flow (OPF) is a very important tool for planning and analysis of power systems. In the recent times, uncertain renewable energy is being… (more)

Arneja, Inderdeep S. (Author)

2012-01-01T23:59:59.000Z

62

Programming Project : Admittance Matrix and Power/Load-Flow  

E-Print Network (OSTI)

Programming Project : Admittance Matrix and Power/Load-Flow EE 581 April 19, 2012 1 Introduction This project will be to develop your own power-flow (also known as load-flow) solver to study balanced, three-phase power systems in sinusoidal steady-state. The program will read in data from three files (bus, line

Wedeward, Kevin

63

Stirling engine power control and motion conversion mechanism  

DOE Patents (OSTI)

A motion conversion device for converting between the reciprocating motion of the pistons in a Stirling engine and the rotating motion of its output shaft, and for changing the stroke and phase of the pistons, includes a lever pivoted at one end and having a cam follower at the other end. The piston rod engages the lever intermediate its ends and the cam follower engages a cam keyed to the output shaft. The lever pivot can be moved to change the length of the moment arm defined between the cam follower and the piston rod the change the piston stroke and force exerted on the cam, and the levers can be moved in opposite directions to change the phase between pistons.

Marks, David T. (Birmingham, MI)

1983-01-01T23:59:59.000Z

64

Selected papers from the 9th International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2009)  

E-Print Network (OSTI)

Generation and Energy Conversion Applications (PowerMEMS 2009) This article has been downloaded from and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2009) Guest Editors Reza selected from the 9th International Workshop on Micro and Nanotechnology for Power Generation and Energy

Rubloff, Gary W.

65

Programming Project 4: Power-Flow March 1, 2010  

E-Print Network (OSTI)

SocorroLo 6 1 0 0 0 -0.34 -0.29 Table 1: Bus data for 6 bus power system. ** Load Flow Solution ** Bus will be to develop your own power-flow (also known as load-flow) solver and power system simulator to study power/O Specifications The desired format of your input and power system description is three sections (or files) of data

Wedeward, Kevin

66

Newton-Krylov Methods in Power Flow and Contingency Analysis  

E-Print Network (OSTI)

for the generation, transmission, and distribution of electrical energy. Power systems are considered to be the largest and most complex man-made systems. As electrical energy is vital to our society, power systems in both operational control and planning of power systems. Essential tools are power flow (or load flow

Vuik, Kees

67

Power Flow Controller for Renewables: Transformer-less Unified Power Flow Controller for Wind and Solar Power Transmission  

SciTech Connect

GENI Project: MSU is developing a power flow controller to improve the routing of electricity from renewable sources through existing power lines. The fast, innovative, and lightweight circuitry that MSU is incorporating into its controller will eliminate the need for a separate heavy and expensive transformer, as well as the construction of new transmission lines. MSU’s controller is better suited to control power flows from distributed and intermittent wind and solar power systems than traditional transformer-based controllers are, so it will help to integrate more renewable energy into the grid. MSU‘s power flow controller can be installed anywhere in the existing grid to optimize energy transmission and help reduce transmission congestion.

None

2012-02-08T23:59:59.000Z

68

Hybridizing Energy Conversion and Storage in a Mechanical-to-Electrochemical Process for Self-Charging Power Cell  

E-Print Network (OSTI)

Hybridizing Energy Conversion and Storage in a Mechanical-to- Electrochemical Process for Self-charging power cell, mechanical energy, piezoelectricity, lithium ion battery, electrochemistry Energy conversion physical units achieving the conversions from mechanical energy to electricity and then from electric

Wang, Zhong L.

69

Solar power conversion efficiency in modulated silicon nanowire photonic Alexei Deinega and Sajeev John  

E-Print Network (OSTI)

Solar power conversion efficiency in modulated silicon nanowire photonic crystals Alexei Deinega by the American Institute of Physics. Related Articles Solar energy trapping with modulated silicon nanowire multiple carrier generation via singlet exciton fission Appl. Phys. Lett. 101, 153507 (2012) Light trapping

John, Sajeev

70

High-power parametric conversion from near-infrared to short-wave infrared  

E-Print Network (OSTI)

High-power parametric conversion from near-infrared to short-wave infrared Adrien Billat,1,* Steevy.billat@epfl.ch Abstract: We report the design of an all-fiber continuous wave Short-Wave Infrared source capable to output.4370) Nonlinear optics, fibers; (140.3070) Infrared and far-infrared lasers. References and links 1. M. N

Dalang, Robert C.

71

Unified boundary and probabilistic power flow  

Science Journals Connector (OSTI)

Abstract Different types of uncertainties exist in system data. Outages, errors in load forecasts and renewable generations are generally represented as probabilistic uncertainties. Load model coefficients and network parameters, on the other hand, are best represented as interval uncertainties. Irrespective of the nature of these uncertainties, all of them need to be considered in an integrated manner for proper system analysis. This paper tries to fulfill this precise need. By utilizing the synergy of boundary and probabilistic power flow algorithms, development of efficient line outage simulation and use of constant Jacobian approach, the computational burden has been kept to a manageable level. The proposed approach can be used for both transmission and distribution systems. Results for two transmission and one distribution systems have been obtained with various types of uncertainties. Validation of results has been done through the Monte Carlo Simulations (MCS).

A. Mohapatra; P.R. Bijwe; B.K. Panigrahi

2014-01-01T23:59:59.000Z

72

Evaluation and Optimization of a Supercritical Carbon Dioxide Power Conversion Cycle for Nuclear Applications  

SciTech Connect

There have been a number of studies involving the use of gases operating in the supercritical mode for power production and process heat applications. Supercritical carbon dioxide (CO2) is particularly attractive because it is capable of achieving relatively high power conversion cycle efficiencies in the temperature range between 550°C and 750°C. Therefore, it has the potential for use with any type of high-temperature nuclear reactor concept, assuming reactor core outlet temperatures of at least 550°C. The particular power cycle investigated in this paper is a supercritical CO2 Recompression Brayton Cycle. The CO2 Recompression Brayton Cycle can be used as either a direct or indirect power conversion cycle, depending on the reactor type and reactor outlet temperature. The advantage of this cycle when compared to the helium Brayton Cycle is the lower required operating temperature; 550°C versus 850°C. However, the supercritical CO2 Recompression Brayton Cycle requires an operating pressure in the range of 20 MPa, which is considerably higher than the required helium Brayton cycle operating pressure of 8 MPa. This paper presents results of analyses performed using the UniSim process analyses software to evaluate the performance of the supercritical CO2 Brayton Recompression Cycle for different reactor outlet temperatures. The UniSim model assumed a 600 MWt reactor power source, which provides heat to the power cycle at a maximum temperature of between 550°C and 750°C. The UniSim model used realistic component parameters and operating conditions to model the complete power conversion system. CO2 properties were evaluated, and the operating range for the cycle was adjusted to take advantage of the rapidly changing conditions near the critical point. The UniSim model was then optimized to maximize the power cycle thermal efficiency at the different maximum power cycle operating temperatures. The results of the analyses showed that power cycle thermal efficiencies in the range of 40 to 50% can be achieved.

Edwin A. Harvego; Michael G. McKellar

2011-05-01T23:59:59.000Z

73

Solution-Processed Organic Solar Cells with Power Conversion Efficiencies of 2.5% using Benzothiadiazole/Imide-Based Acceptors  

E-Print Network (OSTI)

Solution-Processed Organic Solar Cells with Power Conversion Efficiencies of 2.5% using achieved 0.1% power-conversion efficiency. KEYWORDS: organic electronics, solar cells, photovoltaic devices significantly different behav- iors in bulk heterojunction (BHJ) solar cells using poly(3-hexylthiophene) (P3HT

McGehee, Michael

74

Design of a Power Oscillation Damper for DFIG-based Wind Energy Conversion System Using Modified Particle Swarm Optimizer  

Science Journals Connector (OSTI)

This paper presents a method to design a Power Oscillation Damper (POD) for Double-Fed Induction Generator (DFIG) based Wind Energy Conversion System (WECS), operating with voltage control loop. Based on eigen values information from Small Signal Stability ... Keywords: Computational Intelligence, double fed induction generator, power oscillation damper, modified particle swarm optimizer, small signal stability analysis, wind energy conversion system

Huazhang Huang; C. Y. Chung

2012-05-01T23:59:59.000Z

75

The 6th International Workshop on Micro and Nanotechnologies for Power Generation and Energy Conversion Applications (PowerMEMS 2006)  

Science Journals Connector (OSTI)

Energy is a sector of paramount importance over the coming decades if we are to ensure sustainable development that respects our environment. The research and development of novel approaches to convert available energy into usable forms using micro and nanotechnologies can contribute towards this goal and meet the growing need for power in small scale portable applications. The dominant power sources for handheld and other portable electronics are currently primary and rechargeable batteries. Their limited energy density and adverse effects on the environment upon disposal suggest that alternative approaches need to be explored. This special issue will showcase some of the leading work in this area, initially presented at PowerMEMS 2006, the 6th International Workshop on Micro and Nanotechnologies for Power Generation and Energy Conversion Applications. Power MEMS are defined as microsystems for electrical power generation and other energy conversion applications, including propulsion and cooling. The range of power MEMS technologies includes micro thermodynamic machines, such as microturbines, miniature internal combustion engines and micro-coolers; solid-state direct energy conversion, such as thermoelectric and photovoltaic microstructures; micro electrochemical devices, such as micro fuel cells and nanostructure batteries; vibration energy harvesting devices, such as piezoelectric, magnetic or electrostatic micro generators, as well as micro thrusters and rocket engines for propulsion. These can either be driven by scavenging thermal, mechanical or solar energy from the environment, or from a stored energy source, such as chemical fuel or radioactive material. The unique scope leads to unique challenges in the development of power MEMS, ranging from the integration of novel materials to the efficient small scale implementation of energy conversion principles. In this special issue, Mitcheson et al provide a comparative assessment of three inertial vibration energy harvesting approaches. Technologies and approaches for micro heat engines are shared, ranging from a complete microsystem for thermal energy harvesting (Cho et al) to core bearing and microturbomachinery technologies for rotating micro heat engines (Waits et al, Nakajima et al). Electrochemical microsystems are also presented, based on methanol as fuel (Morse et al), as well as novel micro and nanofabrication approaches (Chu et al). Fuel cell microsystems with integrated hydrogen generation approaches are also investigated by Peterson et al and Varady et al, illustrating the benefits and challenges of miniaturizing complete power sources. Finally, biological micro fuel cells that leverage the principles found in nature are presented, in contrast to chemical fuel cells (Chen et al, Morishima et al). We hope that this work will inspire others to pursue innovative research and development activities in the area of power MEMS, and consequently contribute to addressing our energy challenges for the 21st century.

Luc G Fréchette

2007-01-01T23:59:59.000Z

76

ICRF Mode Conversion Flow Drive Experiments on Alcator C-Mod  

SciTech Connect

We have carried out a detailed study of the dependence of ICRF mode conversion flow drive (MCFD) on plasma and RF parameters. The flow drive efficiency is found to depend strongly on the {sup 3}He concentration in D({sup 3}He) plasmas, a key parameter separating the ICRF minority heating regime and mode conversion regime. At +90 deg. antenna phasing (waves in the co-I{sub p} direction) and dipole phasing, the driven flow is in the co-I{sub p} direction, and the change of the rotation velocity increases with both P{sub RF} and I{sub p}, and scales unfavorably vs. plasma density and antenna frequency. When MCFD is applied to I-mode plasmas, the plasma rotation increases until the onset of MHD modes triggered by large sawtooth crashes. Very high performance I-mode plasmas with H{sub ITER98,y2}{approx}1.4 and T{sub e0}{approx}8 keV have been obtained in these experiments.

Lin, Y.; Reinke, M. L.; Rice, J. E.; Wukitch, S. J.; Granetz, R.; Greenwald, M.; Hubbard, A. E.; Marmar, E. S.; Podpaly, Y. A.; Porkolab, M.; Tsujii, N.; Wolfe, S. [MIT Plasma Science and Fusion Center, Cambridge, MA 02139 (United States)

2011-12-23T23:59:59.000Z

77

Biostirling({trademark}): A small biomass power conversion system using an advanced stirling engine  

SciTech Connect

Over the past decade the need for small power conversion systems to serve rural and/or remote needs has increased dramatically. The requirements for systems <100 kW are very similar, whether the need is defined as {open_quotes}rural electrification{close_quotes} in developed countries, or as {open_quotes}village power{close_quotes} in developing countries. The availability of biomass fuel resources to serve such systems is not in doubt, be they agricultural, forestry, animal or urban wastes. The main inhibiting factor has been the absence of a biomass power conversion system characterized by: reliability, cost effectiveness, low pollution, and ease of maintenance. Stirling Thermal Motors of Ann Arbor, Michigan, is recognized as the leader worldwide in the development and application of Stirling engine technology. It is currently demonstrating a {open_quotes}BioStirling({trademark}){close_quotes} Power Conversion System which combines its unique STM4-120 engine rated at 25 kW with a proven commercial gasifier. The BioStirling({trademark}) proof-of-concept demonstration is funded by DOE`s National Renewable Energy Laboratory and is to be completed in late 1996, with field demonstrations in 1997 and commercial availability 1998.

Johansson, L. [Stirling Thermal Motors, Inc., Ann Arbor, MI (United States); Ziph, B.; McKeough, W.; Houtman, W.

1996-12-31T23:59:59.000Z

78

Reclaiming lost capability in power plant coal conversions: an innovative, low-cost approach  

SciTech Connect

Some of the capability lost during coal conversion can be recovered for midrange/peaking power generation through low cost, turbine cycle and economizer modifications. The additional output can be realized by shutting off adjacent high pressure feedwater heaters (as specified by turbogenerator manufacturers) and simultaneously increasing heat input to the economizer. The supplemental economizer heat input makes up for heat lost to the feedwater when extraction steam is shut off. Several options for applying this novel approach to capability recovery are described. The reclaimed capability is realized at somewhat lower efficiency but at low cost, compared to the overall cost of a coal conversion. Rather than return converted units to up to 100% oil or gas firing during periods of high system demand, the proposed method allows the continued comsumption of coal for the base-load portion of the plant's output. The development of the low NO/sub x/ Slagging Combustor will allow even the added economizer heat input to be supplied by relatively low cost coal. Following a brief review of factors affecting boiler capability in coal conversions and current approaches to coal conversion in this country and overseas, the results of a preliminary study that apply the proposed novel concept to a West Coast power plant are described.

Miliaras, E.S.; Kelleher, P.J.; Fujimura, K.S.

1983-01-01T23:59:59.000Z

79

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 25, NO. 3, SEPTEMBER 2010 901 Benefits of Power Electronic Interfaces  

E-Print Network (OSTI)

to understand the integration of these systems with the electric power systems. New markets and benefits for DE current, interconnection, interface, inverter, microgrid, power electronics (PE), power quality. IIEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 25, NO. 3, SEPTEMBER 2010 901 Benefits of Power

Simões, Marcelo Godoy

80

High Energy Utilization, Co-Generation Nuclear power Plants With Static Energy Conversion  

SciTech Connect

In addition to being cost effective, very small nuclear power plants with static energy conversion could meet the needs and the energy mix in underdeveloped countries and remote communities, which may include electricity, residential and industrial space heating, seawater desalination, and/or high temperature process heat or steam for industrial uses. These plants are also an attractive option in naval, marine, and undersea applications, when the absence of a sound signature is highly desirable. An Analysis is performed of Gas Cooled Reactor (CGR) and Liquid Metal Cooled Reactor (LMR), very small nuclear power plants with static energy conversion, using a combination of options. These include Alkali Metal Thermal-to-Electric Converters (AMTECs) and both single segment and segmented thermoelectric converters. The total energy utilization of these plants exceeds 88%. It includes the fraction of the reactor's thermal power converted into electricity and delivered to the Grid at 6.6 kVA and those used for residential and industrial space heating at {approx}370 K, seawater desalination at 400 K, and/or high temperature process heat or steam at {approx}850 K. In addition to its inherently high reliability, modularity, low maintenance and redundancy, static energy conversion used in the present study could deliver electricity to the Grid at a net efficiency of 29.5%. A LMR plant delivers 2-3 times the fraction of the reactor thermal power converted into electricity in a GCR plant, but could not provide for both seawater desalination and high temperature process heat/steam concurrently, which is possible in GCR plants. The fraction of the reactor's thermal power used for non-electrical power generation in a GCR plant is {approx} 10 - 15% higher than in a LMR plant. (authors)

El-Genk, Mohamed S.; Tournier, Jean-Michel P. [Institute for Space and Nuclear Power Studies and Chemical and Nuclear Engineering Department, The University of New Mexico, Albuquerque, NM (United States)

2002-07-01T23:59:59.000Z

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


81

Outage Detection in Power Distribution Networks with Optimally-Deployed Power Flow Sensors  

E-Print Network (OSTI)

Outage Detection in Power Distribution Networks with Optimally-Deployed Power Flow Sensors Yue Zhao deployed real-time power flow sensors and that of load estimates via Advanced Metering Infrastructure (AMI within each subtree only the sensors at its root and on its boundary are used. Outage detection

Zhao, Yue

82

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network (OSTI)

77 5.2 Wind Energy Conversion System . . . . .Optimization and Control in Wind Energy Conversion SystemsAC matrix con- verter for wind energy conversion system,” in

Ghaffari, Azad

2013-01-01T23:59:59.000Z

83

Primus Power's Flow Battery Powered by $11 Million in Private Investment  

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

Primus Power's Flow Battery Powered by $11 Million in Private Primus Power's Flow Battery Powered by $11 Million in Private Investment Primus Power's Flow Battery Powered by $11 Million in Private Investment June 14, 2011 - 10:00am Addthis Primus Power's energy cell stack. | Photo Courtesy of Primus Power Primus Power's energy cell stack. | Photo Courtesy of Primus Power Kristina Pflanz Writer & Contractor, Advanced Research Projects Agency - Energy What does this mean for me? Will make renewable energy sources, such as solar and wind, available to more utility customers. In February, the Advanced Research Projects Agency-Energy (ARPA-E) announced that six of its projects, which initially received a total of $23.6 million in agency seed funding, had collectively generated more than $100 million in outside private capital investment. ARPA-E recently

84

Cornell's conversion of a coal fired heating plant to natural Gas -BACKGROUND: In December 2009, the Combined Heat and Power Plant  

E-Print Network (OSTI)

- BACKGROUND: In December 2009, the Combined Heat and Power Plant at Cornell Cornell's conversion of a coal fired heating plant to natural Gas the power plant #12;

Keinan, Alon

85

Super-radiant backward-wave oscillators with enhanced power conversion  

SciTech Connect

We propose a method for a very significant increase of the peak power of a backward-wave electron oscillator operating in the non-stationary regime of the super-radiation of short rf pulses. This method is based on sectioning: a regular self-oscillator section is supported with a section providing amplification of the super-radiant pulse. Profiling of a resonant parameter in the amplifying section is used to avoid the parasitic self-excitation and to increase the efficiency of the electron-wave interaction. In such systems, the conversion factor (the ratio between the rf pulse power and the electron beam power) can achieve a few hundred percent.

Rostov, V. V. [Institute of High Current Electronics, Siberian Branch of Russian Academy of Science, Tomsk (Russian Federation); Savilov, A. V. [Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia, and Lobachevsky State University of Nizhny Novgorod (Russian Federation)

2013-02-15T23:59:59.000Z

86

AC-DC Microgrid Optimal Power Flow.  

E-Print Network (OSTI)

??Electricity market deregulation has opened the door for novel electricity production schemes within the existing central production paradigm that dominates the electricity power industry. The… (more)

Duggal, Inderjeet (Author)

2012-01-01T23:59:59.000Z

87

Free Flow Energy (TRL 1 2 3 Component)- Design and Development of a Cross-Platform Submersible Generator Optimized for the Conditions of Current Energy Conversion  

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

Free Flow Energy (TRL 1 2 3 Component) - Design and Development of a Cross-Platform Submersible Generator Optimized for the Conditions of Current Energy Conversion

88

Tidal flow to power New York City  

Science Journals Connector (OSTI)

... Verdant Power, an energy company based in Arlington, Virginia, plans to plunge six electricity turbines into the East River. If the $4.5-million project is successful, the ... 5-million project is successful, the generators will form the first farm of tide-powered turbines in the world. The plan is to attach the machines, which look like small ...

Helen Pearson

2004-08-13T23:59:59.000Z

89

Structure, Dynamics, and Power Conversion Efficiency Correlations in a New Low Bandgap Polymer: PCBM Solar Cell  

Science Journals Connector (OSTI)

Since their discovery about 15 years ago, bulk heterojunction (BHJ) organic photovoltaic (OPV) devices made from semiconducting polymers have shown promise for future commercialization due to their low cost, ease of fabrication, and small environmental impact relative to silicon and heavy metal based semiconductor solar cells. ... (1-3) To achieve a high power conversion efficiency (PCE) in solar cells based on BHJ OPV materials, the semiconducting polymer composites must be efficient in light harvesting, exciton splitting, charge carrier generation, and transport. ... The white light continuum probe pulses were generated by focusing a few microjoules of the Ti:sapphire amplifier output onto a sapphire disk. ...

Jianchang Guo; Yongye Liang; Jodi Szarko; Byeongdu Lee; Hae Jung Son; Brian S. Rolczynski; Luping Yu; Lin X. Chen

2009-12-28T23:59:59.000Z

90

Kinematic Stirling engine as an energy conversion subsystem for paraboloidal dish solar thermal power plants  

SciTech Connect

The potential of a suitably designed and economically manufactured Stirling engine as the energy conversion subsystem of a paraboloidal dish-Stirling solar thermal power module has been estimated. Results obtained by elementary cycle analyses have been shown to match quite well the performance characteristics of an advanced kinematic Stirling engine, the United Stirling P-40, as established by current prototypes of the engine and by a more sophisticated analytic model of its advanced derivative. In addition to performance, brief consideration has been given to other Stirling engine criteria such as durability, reliability, and serviceability. Production costs have not been considered here.

Bowyer, J.M.

1984-04-15T23:59:59.000Z

91

Fully Solar-Powered Photoelectrochemical Conversion for Simultaneous Energy Storage and Chemical Sensing  

Science Journals Connector (OSTI)

Fully Solar-Powered Photoelectrochemical Conversion for Simultaneous Energy Storage and Chemical Sensing ... (15) Nonetheless, the storage and utilization of the oxidative energy carried by the photogenerated holes at the photoanodes are generally low, due to large overpotential for water oxidation, as well as the electric energy loss when driving charge carriers through multiple material interfaces and external circuits. ... In such an integrated device, the photogenerated electrons are utilized for H2 generation and holes for pseudocapacitive charging, so that both the reductive and oxidative energies are captured and converted. ...

Yongcheng Wang; Jing Tang; Zheng Peng; Yuhang Wang; Dingsi Jia; Biao Kong; Ahmed A. Elzatahry; Dongyuan Zhao; Gengfeng Zheng

2014-05-13T23:59:59.000Z

92

Exact Convex Relaxation of Optimal Power Flow in Radial Networks  

E-Print Network (OSTI)

flow laws can be approximated by linear equations known as the DC power flow model [2]­[4], if 1) line important for distribution networks due to the advent of distributed generation (e.g., rooftop photovoltaic panels) and controllable loads (e.g., electric vehicles). Distributed generation is difficult to predict

Low, Steven H.

93

Potassium-Rankine power conversion subsystem modeling for nuclear electric propulsion  

SciTech Connect

A potassium-Rankine power conversion system model was developed under Contract No. NAS3-25808 for the NASA-LeRC. This model predicts potassium-Rankine performance for turbine inlet temperatures (TIT) from 1200 - 1600 K, TIT to condenser temperature ratios from 1.25-1.6, power levels from 100 to 10,000 kWe, and lifetimes from 2-10 years. The model is for a Rankine cycle with reheat for turbine stage moisture control. The model assumes heat is supplied from a lithium heat transport loop. The model does not include a heat source or a condenser/heat rejection system model. These must be supplied by the user.

Johnson, G.A.

1993-09-01T23:59:59.000Z

94

A new continuous-flow process for catalytic conversion of glycerol to oxygenated fuel additive: Catalyst screening  

E-Print Network (OSTI)

: www.elsevier.com/locate/apenergy #12;1. Introduction The booming of biodiesel industry all over for the sustainability of biodiesel industry. In this regard, the fuel industry seems to be a suitable market whereA new continuous-flow process for catalytic conversion of glycerol to oxygenated fuel additive

Qin, Wensheng

95

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 24, NO. 1, MARCH 2009 125 Short-Term Prediction of Wind Farm Power  

E-Print Network (OSTI)

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 24, NO. 1, MARCH 2009 125 Short-Term Prediction of Wind Farm Power: A Data Mining Approach Andrew Kusiak, Member, IEEE, Haiyang Zheng, and Zhe Song, Student Member, IEEE Abstract--This paper examines time series models for predicting the power of a wind

Kusiak, Andrew

96

Dynamic Power Flow Controller: Compact Dynamic Phase Angle Regulators for Transmission Power Routing  

SciTech Connect

GENI Project: Varentec is developing compact, low-cost transmission power controllers with fractional power rating for controlling power flow on transmission networks. The technology will enhance grid operations through improved use of current assets and by dramatically reducing the number of transmission lines that have to be built to meet increasing contributions of renewable energy sources like wind and solar. The proposed transmission controllers would allow for the dynamic control of voltage and power flow, improving the grid’s ability to dispatch power in real time to the places where it is most needed. The controllers would work as fail-safe devices whereby the grid would be restored to its present operating state in the event of a controller malfunction instead of failing outright. The ability to affordably and dynamically control power flow with adequate fail-safe switchgear could open up new competitive energy markets which are not possible under the current regulatory structure and technology base.

None

2012-01-03T23:59:59.000Z

97

A novel design for monolithic interconnected modules (MIMs) for thermophotovoltaic (TPV) power conversion  

SciTech Connect

The design for the fabrication of Monolithic Interconnected Modules (MIMs) for thermophotovoltaic (TPV) power conversion described in this paper utilizes a novel, interdigitated contacting scheme that increases the flexibility in the size of the component cells and hence the output current and voltage of the module. This flexibility is gained at the expense of only minimally increased grid obscuration. Because the design uses the grid fingers of the component cells as the interconnect structure, the area of the device used for this purpose becomes negligible. In this paper the authors report on the specifics of the design as well as issues related to the fabrication of the modules. Preliminary performance data for representative modules also are offered.

Ward, J.S.; Duda, A.; Wanlass, M.W. [National Renewable Energy Lab., Golden, CO (United States)] [and others

1997-06-01T23:59:59.000Z

98

Advanced fusion MHD power conversion using the CFAR (compact fusion advanced Rankine) cycle concept  

SciTech Connect

The CFAR (compact fusion advanced Rankine) cycle concept for a tokamak reactor involves the use of a high-temperature Rankine cycle in combination with microwave superheaters and nonequilibrium MHD disk generators to obtain a compact, low-capital-cost power conversion system which fits almost entirely within the reactor vault. The significant savings in the balance-of-plant costs are expected to result in much lower costs of electricity than previous concepts. This paper describes the unique features of the CFAR cycle and a high- temperature blanket designed to take advantage of it as well as the predicted performance of the MHD disk generators using mercury seeded with cesium. 40 refs., 8 figs., 3 tabs.

Hoffman, M.A.; Campbell, R.; Logan, B.G. (California Univ., Davis, CA (USA); Lawrence Livermore National Lab., CA (USA))

1988-10-01T23:59:59.000Z

99

Energy conversions and storage caused by an unsteady poloidal flow in active solar regions  

Science Journals Connector (OSTI)

In this paper we discuss coupling processes between a magnetic field and an unsteady plasma motion, and analyze the features of energy storage and conversions in active region.

Zhongyuan Li; W. R. Hu

100

RLOPF (risk-limiting optimal power flow) for systems with high penetration of wind power  

Science Journals Connector (OSTI)

Abstract In this paper, we formulate a RLOPF (risk-limiting optimal power flow) problem for systems with high penetration of wind power to address the issue of possibly violating the security constraints in power systems due to the volatility of wind power generations. To cope with the computational complexity of the proposed RLOPF problem, we propose a computationally efficient RLOPF algorithm assisted by the off-line constructed probability distribution models for bus voltage magnitudes and transmission line real power flows. We apply the proposed RLOPF algorithm to the RLOPF problems on a 26-bus power system for two cases of significantly different re-dispatching percentage share for non-renewable power generations to compensate the volatility of wind power generations. The test results reveal that the performance of all solutions obtained by the proposed RLOPF algorithm of various step-sizes in both cases meet the required probability 0.95 on satisfying the security constraints in the presence of variable wind power generations, and the CPU time consumption are mostly within 1 s. We also test the performance of conventional OPF (optimal power flow) solution on both cases, and the resulted probability are all smaller than 0.783. These test results demonstrate the merit and the computational efficiency of the proposed RLOPF algorithm.

Shin-Yeu Lin; Ai-Chih Lin

2014-01-01T23:59:59.000Z

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


101

Optimal Power Flow Based Demand Response Offer Price Optimization  

E-Print Network (OSTI)

Optimal Power Flow Based Demand Response Offer Price Optimization Zhen Qiu 1 Introduction-time energy balance. Demand response programs are offered by the utility companies to reduce the load response cost in exchange for load reduction. A considerable amount of papers have discussed the demand

Lavaei, Javad

102

Transaction Based Power Flow Analysis For Transmission Utilization Allocation  

E-Print Network (OSTI)

allocation rules for cross terms are proposed to hedge firm or existing transactions against market risk markets (PX) and bilateral contract transactions (BC) share the same transmission system, and their ownTransaction Based Power Flow Analysis For Transmission Utilization Allocation Garng Huang, Senior

103

POWER FLOW ANALYSIS OF ELECTROSTRICTIVE ACTUATORS DRIVEN BYSWITCHMODE AMPLIFIERS  

E-Print Network (OSTI)

the actuator. INTRODUCTION Smart materials or smart structures are materials that contain actuators, sensors@vt.edu Journal on Intelligent Material Systems and Structures Vol. 9, No 3, March, 1998 pp. 210 - 222. Keywords: smart structures, smart skin, switchmode amplifiers, power flow analysis, electrostrictive actuators

Lindner, Douglas K.

104

Journal of Power Sources 156 (2006) 677684 Thermodynamic analysis of electrokinetic energy conversion  

E-Print Network (OSTI)

is carried out for electrokinetic energy conversion. We demonstrate that the efficiencies depend solely Elsevier B.V. All rights reserved. Keywords: Electrokinetic energy conversion; Generator; Pump; Figure) are generated between the ends of the capillary, indicating a conversion of mechan- ical energy into electrical

Xuan, Xiangchun "Schwann"

105

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 23, NO. 2, JUNE 2008 551 Sliding Mode Power Control of Variable-Speed Wind  

E-Print Network (OSTI)

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 23, NO. 2, JUNE 2008 551 Sliding Mode Power Control of Variable-Speed Wind Energy Conversion Systems Brice Beltran, Tarek Ahmed-Ali, and Mohamed El Hachemi in variable-speed wind energy conversion sys- tems (VS-WECS). These systems have two operation regions de

Paris-Sud XI, Université de

106

Improving the Power Conversion Efficiency of Ultrathin Organic Solar Cells by Incorporating Plasmonic Effects of Spheroidal Metallic Nanoparticles  

E-Print Network (OSTI)

Improving the Power Conversion Efficiency of Ultrathin Organic Solar Cells by Incorporating be exploited to achieve efficient harvesting of solar energy. Notably, the incorporation of plasmonic effects can allow the light harvesting capability of a solar cell to be maintained even as the thickness

Park, Namkyoo

107

84Unit Conversions Energy, Power, Flux Energy is measured in a number of ways depending on what property is being  

E-Print Network (OSTI)

property is being represented. Total Energy - Joules and ergs - The total amount of energy in various forms is left on for 1 hour: Convert its energy consumption of 5 watt-hours to Joules. 1 Joule 3,600 sec 5 Watt84Unit Conversions ­ Energy, Power, Flux Energy is measured in a number of ways depending on what

108

Performance analysis of an absorption power cycle for ocean thermal energy conversion  

Science Journals Connector (OSTI)

Abstract An absorption power cycle with two ejectors is proposed for ocean thermal energy conversion. The ammonia–water is used as the working fluid. The ejectors are driven by vapor and solution from the sub-generator. Based on the first and second law, the mathematical model for this cycle is developed and theoretical analysis is conducted to evaluate the effects of thermodynamic parameters on the performance of this cycle. Results show that the absorption temperature is increased by 2.0–6.5 °C by employing the two-stage ejector sub-cycle, which indicates that this proposed cycle can be driven with a lower temperature difference. Further, the thermal efficiency, net thermal efficiency and exergy efficiency of this cycle can reach to 4.17%, 3.10% and 39.92% respectively. Besides, the generation pressure, the heating source temperature, the solution concentration, and the expansion ratio, as well as the entrainment ratio of the first stage ejector have significant effects on the absorption temperature, the thermal efficiency, the exergy efficiency and the exergy loss of this cycle. In addition, 49.80% of exergy loss in this proposed cycle occurs in the generators and reheater, followed by the ejectors of 36.12%.

Han Yuan; Ning Mei; Peilin Zhou

2014-01-01T23:59:59.000Z

109

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network (OSTI)

and Optimization of Photovoltaic and Wind Energy Conversionand Optimization of Photovoltaic and Wind Energy Conversionpower of Photovoltaic modules and Wind Energy Conversion

Ghaffari, Azad

2013-01-01T23:59:59.000Z

110

Free Flow Power Partners to Improve Hydrokinetic Turbine Performance and Cost  

Office of Energy Efficiency and Renewable Energy (EERE)

Free Flow Power is working to enable American utilities to generate power from river sites not suited to conventional hydropower generation.

111

Proc. IEEE PowerTech, Bucharest, June 2009. 1 Abstract-Power flow studies are typically used to determine  

E-Print Network (OSTI)

to determine the steady state or operating conditions of power systems for specified sets of load, and hence reliable solution algorithms that incorporate the effect of data uncertainty into the power flow that incorporate the effect of data uncertainties into the power flow This work was partially supported by NSERC

Cañizares, Claudio A.

112

Modified Centrality Measure Based on Bidirectional Power Flow for Smart and Bulk Power  

E-Print Network (OSTI)

the directionality of power flow of future smart grid. Appli- cability of the proposed method has been evaluated smart and new technologies by utilities [1]. The scope of smart grid includes various generation options systems is the most lucrative part of smart grid from the point of view of regulating energy usage. Excess

Pota, Himanshu Roy

113

Technology Development Program for an Advanced Potassium Rankine Power Conversion System Compatible with Several Space Reactor Designs  

SciTech Connect

This report documents the work performed during the first phase of the National Aeronautics and Space Administration (NASA), National Research Announcement (NRA) Technology Development Program for an Advanced Potassium Rankine Power Conversion System Compatible with Several Space Reactor Designs. The document includes an optimization of both 100-kW{sub e} and 250-kW{sub e} (at the propulsion unit) Rankine cycle power conversion systems. In order to perform the mass optimization of these systems, several parametric evaluations of different design options were investigated. These options included feed and reheat, vapor superheat levels entering the turbine, three different material types, and multiple heat rejection system designs. The overall masses of these Nb-1%Zr systems are approximately 3100 kg and 6300 kg for the 100- kW{sub e} and 250-kW{sub e} systems, respectively, each with two totally redundant power conversion units, including the mass of the single reactor and shield. Initial conceptual designs for each of the components were developed in order to estimate component masses. In addition, an overall system concept was presented that was designed to fit within the launch envelope of a heavy lift vehicle. A technology development plan is presented in the report that describes the major efforts that are required to reach a technology readiness level of 6. A 10-year development plan was proposed.

Yoder, G.L.

2005-10-03T23:59:59.000Z

114

6th International Symposium on Multiphase Flow, Heat Mass Transfer and Energy Conversion Xi'an, China, 11-15 July 2009  

E-Print Network (OSTI)

6th International Symposium on Multiphase Flow, Heat Mass Transfer and Energy Conversion Xi in pipeline transportation, where it is important to identify and control bottlenecks influence on production be viewed as the hydrodynamic equivalent of the Mach number for gas flows. Simplified hydraulic theories

Al Hanbali, Ahmad

115

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network (OSTI)

be realized by capturing wind power at altitudes over the2011. [2] ——, “High altitude wind power systems: A survey onOckels, “Optimal cross-wind towing and power generation with

Ghaffari, Azad

2013-01-01T23:59:59.000Z

116

MARTHA: Architecture for Control and Emulation of Power Electronics and Smart Grid Systems  

E-Print Network (OSTI)

conversion; (3) it allows for power flow control between an electric vehicle motor and battery; and (4 conversion technology [1] that enables efficient and fully controllable conversion of electrical power) it enables power grid dynamic stabilization. Power electronics could potentially reduce overall electricity

Devadas, Srinivas

117

Conceptual design of the bimodal nuclear power system based on the ‘‘Romashka’’ type reactor with thermionic energy conversion system  

Science Journals Connector (OSTI)

The paper presents conceptual design of the bimodal space nuclear power system (NPS) based on the high?temperature reactor of ROMASHKA type with thermoninic energy conversion system. At the heart of the design is an employment of close?spaced thermionic diodes operating in a quasi?vacuum mode. The paper gives preliminary estimates of the NPS neutron?physical electric thermophysical and mass?dimensional parameters for the reactor electric power of 25 kW and propulsive thrust of about 80 N. Discussed are peculiarities of the combined mode wherein electric power is generated along with propulsive thrust. The paper contains results of the design studies performed by the Small Business ‘‘NP Energotech’’ under the Agreement with Rockwell International/Rocketdyne Division and according to the Rocketdyne Division provided Design Requirements. Involved in the work was the team of specialists of RRC ‘‘Kurchatov Institute’’ ‘‘Red Star’’ State Enterprise and Research Institute of SPA ‘‘Luch’’

Nikolai N. Ponmarev?Stepnoi; Veniamin A. Usov; Yuri V. Nikolaev; Stanislav A. Yeriemin; Yevgeny Ye. Zhabotinski; Anatoly Ya. Galkin; Yevgeny D. Avdoshyn

1995-01-01T23:59:59.000Z

118

Comparison of x ray computed tomography number to proton relative linear stopping power conversion functions using a standard phantom  

SciTech Connect

Purpose: Adequate evaluation of the results from multi-institutional trials involving light ion beam treatments requires consideration of the planning margins applied to both targets and organs at risk. A major uncertainty that affects the size of these margins is the conversion of x ray computed tomography numbers (XCTNs) to relative linear stopping powers (RLSPs). Various facilities engaged in multi-institutional clinical trials involving proton beams have been applying significantly different margins in their patient planning. This study was performed to determine the variance in the conversion functions used at proton facilities in the U.S.A. wishing to participate in National Cancer Institute sponsored clinical trials. Methods: A simplified method of determining the conversion function was developed using a standard phantom containing only water and aluminum. The new method was based on the premise that all scanners have their XCTNs for air and water calibrated daily to constant values but that the XCTNs for high density/high atomic number materials are variable with different scanning conditions. The standard phantom was taken to 10 different proton facilities and scanned with the local protocols resulting in 14 derived conversion functions which were compared to the conversion functions used at the local facilities. Results: For tissues within ±300 XCTN of water, all facility functions produced converted RLSP values within ±6% of the values produced by the standard function and within 8% of the values from any other facility's function. For XCTNs corresponding to lung tissue, converted RLSP values differed by as great as ±8% from the standard and up to 16% from the values of other facilities. For XCTNs corresponding to low-density immobilization foam, the maximum to minimum values differed by as much as 40%. Conclusions: The new method greatly simplifies determination of the conversion function, reduces ambiguity, and in the future could promote standardization between facilities. Although it was not possible from these experiments to determine which conversion function is most appropriate, the variation between facilities suggests that the margins used in some facilities to account for the uncertainty in converting XCTNs to RLSPs may be too small.

Moyers, M. F., E-mail: MFMoyers@roadrunner.com [Shanghai Proton and Heavy Ion Center, Shanghai, China 201321 (China)

2014-06-15T23:59:59.000Z

119

Soft Magnetic Materials in High-Frequency, High-Power Conversion Applications  

E-Print Network (OSTI)

Voltage DC (HVDC) technologies aim to improve the effi- ciency of power networks and benefit from high

McHenry, Michael E.

120

Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions  

E-Print Network (OSTI)

Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions by Carl, Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions KTH Nuclear Reactor power is limited by a phenomenon called critical heat flux (CHF). It appears as a sudden detoriation

Haviland, David

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


121

Precision control of high temperature furnaces using an auxiliary power supply and charged practice current flow  

DOE Patents (OSTI)

Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved.

Pollock, George G. (San Ramon, CA)

1997-01-01T23:59:59.000Z

122

Precision control of high temperature furnaces using an auxiliary power supply and charged particle current flow  

DOE Patents (OSTI)

Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved. 5 figs.

Pollock, G.G.

1997-01-28T23:59:59.000Z

123

Chip-Scale Power Conversion for LED Lighting: Integrated Power Chip Converter for Solid-State Lighting  

SciTech Connect

ADEPT Project: Teledyne is developing cost-effective power drivers for energy-efficient LED lights that fit on a compact chip. These power drivers are important because they transmit power throughout the LED device. Traditional LED driver components waste energy and don't last as long as the LED itself. They are also large and bulky, so they must be assembled onto a circuit board separately which increases the overall manufacturing cost of the LED light. Teledyne is shrinking the size and improving the efficiency of its LED driver components by using thin layers of an iron magnetic alloy and new gallium nitride on silicon devices. Smaller, more efficient components will enable the drivers to be integrated on a single chip, reducing costs. The new semiconductors in Teledyne's drivers can also handle higher levels of power and last longer without sacrificing efficiency. Initial applications for Teledyne's LED power drivers include refrigerated grocery display cases and retail lighting.

None

2010-10-01T23:59:59.000Z

124

On the model discriminating power of mu to e conversion in nuclei  

SciTech Connect

Lepton Flavor Violating (LFV) charged lepton decays provide a highly sensitive probe of physics beyond the Standard Model (SM), due to the un-observably small branching fractions ({approx}10{sup -50}) predicted for these modes in the SM (minimally extended to include massive neutrinos). Searches for SM forbidden muon processes, such as {mu} {yields} e{gamma}, {mu} {yields} e{bar e}e, and {mu} {yields} e conversion in nuclei, have provided so far the strongest constraints on LFV new physics. This statement can be characterized in a model-independent way as a lower bound on the scale associated to a set of dimension six effective operators parameterizing new physics beyond the SM. It is a well known fact that while the decay {mu} {yields} e{gamma} is only sensitive to a transition magnetic dipole operator, both {mu} {yields} e{bar e}e and {mu} {yields} e conversion in nuclei are sensitive to transition charge radii operators as well as purely contact four-fermion interactions induced by physics beyond the SM. In other words, different LFV decays have different sensitivities to underlying LFV mechanisms (effective operators). This leads naturally to ask the question whether one could infer the relative strength of these different operators in a completely phenomenological and model-independent way. This would allow one to discriminate among different underlying models of LFV and thus would provide valuable input for model building. In Ref. [1] it was pointed out that in principle, by combining the rates of {mu} {yields} e{gamma} and {mu} {yields} e conversion on different target nuclei, one could discriminate underlying models. In this work we go back to this issue with the aim to: quantify the theoretical uncertainty induced by the hadronization process; and quantify the experimental precision required to realistically infer useful information on the underlying LFV mechanisms. We organize our discussion as follows: in Section 2 we review the derivation of the {mu} {yields} e conversion rate starting from a general effective theory description of the LFV physics. In Section 3 we explore the phenomenological consequence of the simplest possible models, in which only one effective LFV operator dominates. We extend this analysis in Section 4 to the class of models in which two operators dominate. In Section 5 we specialize our discussion to the SUSY see-saw model and summarize the conclusions of our analysis in Section 6.

Cirigliano, Vincenzo [Los Alamos National Laboratory; Kitano, Ryuichiro [JAPAN; Okada, Yashuiro [JAPAN; Tuzon, Paulo [ITALY

2009-01-01T23:59:59.000Z

125

Conversion of raw carbonaceous fuels  

DOE Patents (OSTI)

Three configurations for an electrochemical cell are utilized to generate electric power from the reaction of oxygen or air with porous plates or particulates of carbon, arranged such that waste heat from the electrochemical cells is allowed to flow upwards through a storage chamber or port containing raw carbonaceous fuel. These configurations allow combining the separate processes of devolatilization, pyrolysis and electrochemical conversion of carbon to electric power into a single unit process, fed with raw fuel and exhausting high BTU gases, electric power, and substantially pure CO.sub.2 during operation.

Cooper, John F. (Oakland, CA)

2007-08-07T23:59:59.000Z

126

6th International Symposium on Multiphase Flow, Heat Mass Transfer and Energy Conversion Xi'an, China, 11-15 July 2009  

E-Print Network (OSTI)

6th International Symposium on Multiphase Flow, Heat Mass Transfer and Energy Conversion Xi, hydrogen fuel, obtained from ethanol, is a potentially strong contender as an energy carrier based for more secure and cleaner energy carrier (Barreto, Makihira, and Riahi 2003). Hydrogen can be produced

Khandekar, Sameer

127

Thermoelectric Conversion of Waste Heat to Electricity in an IC Engine Powered Vehicle  

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

Describes TEG systems built at MSU to mitigate couple failures and a cost-benefit analysis for a system used as an energy recovery system ? auxiliary power unit in an over-the-road truck system.

128

Efficient Switches for Solar Power Conversion: Four Quadrant GaN Switch Enabled Three Phase Grid-Tied Microinverters  

SciTech Connect

Solar ADEPT Project: Transphorm is developing power switches for new types of inverters that improve the efficiency and reliability of converting energy from solar panels into useable electricity for the grid. Transistors act as fast switches and control the electrical energy that flows in an electrical circuit. Turning a transistor off opens the circuit and stops the flow of electrical current; turning it on closes the circuit and allows electrical current to flow. In this way a transistor can be used to convert DC from a solar panel into AC for use in a home. Transphorm’s transistors will enable a single semiconductor device to switch electrical currents at high-voltage in both directions—making the inverter more compact and reliable. Transphorm is using Gallium Nitride (GaN) as a semiconductor material in its transistors instead of silicon, which is used in most conventional transistors, because GaN transistors have lower losses at higher voltages and switching frequencies.

None

2012-02-13T23:59:59.000Z

129

Time series power flow analysis for distribution connected PV generation.  

SciTech Connect

Distributed photovoltaic (PV) projects must go through an interconnection study process before connecting to the distribution grid. These studies are intended to identify the likely impacts and mitigation alternatives. In the majority of the cases, system impacts can be ruled out or mitigation can be identified without an involved study, through a screening process or a simple supplemental review study. For some proposed projects, expensive and time-consuming interconnection studies are required. The challenges to performing the studies are twofold. First, every study scenario is potentially unique, as the studies are often highly specific to the amount of PV generation capacity that varies greatly from feeder to feeder and is often unevenly distributed along the same feeder. This can cause location-specific impacts and mitigations. The second challenge is the inherent variability in PV power output which can interact with feeder operation in complex ways, by affecting the operation of voltage regulation and protection devices. The typical simulation tools and methods in use today for distribution system planning are often not adequate to accurately assess these potential impacts. This report demonstrates how quasi-static time series (QSTS) simulation and high time-resolution data can be used to assess the potential impacts in a more comprehensive manner. The QSTS simulations are applied to a set of sample feeders with high PV deployment to illustrate the usefulness of the approach. The report describes methods that can help determine how PV affects distribution system operations. The simulation results are focused on enhancing the understanding of the underlying technical issues. The examples also highlight the steps needed to perform QSTS simulation and describe the data needed to drive the simulations. The goal of this report is to make the methodology of time series power flow analysis readily accessible to utilities and others responsible for evaluating potential PV impacts.

Broderick, Robert Joseph; Quiroz, Jimmy Edward; Ellis, Abraham; Reno, Matthew J. [Georgia Institute of Technology, Atlanta, GA; Smith, Jeff [Electric Power Research Institute, Knoxville, TN; Dugan, Roger [Electric Power Research Institute, Knoxville, TN

2013-01-01T23:59:59.000Z

130

A Novel High-Power-Factor LED-Lamp Driver Based on a Single-Stage Power Conversion  

Science Journals Connector (OSTI)

This paper proposes a novel single-stage driver for supplying a T8-type light-emitting diode (LED) lamp with high power factor. The presented driver integrates a dual buck-boost converter with coupled inductors and a half-bridge series-resonant converter ... Keywords: converter, driver, light-emitting diode (LED)

Chun An Cheng, En Chih Chang, Ching Shien Tseng, Tsung Yuan Chung

2014-06-01T23:59:59.000Z

131

Microsoft Word - CX Tacoma Power Chehalis-Covington analog-digital conversion Final.docx  

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

2 2 REPLY TO ATTN OF: KEC-4 SUBJECT: Environmental Clearance Memorandum John Brank Project Manager - TPC-OL Proposed Action: Bonneville Power Administration (BPA) Tacoma Power Chehalis- Covington 230-kilovolt (kV) line/convert microwave signals from analog to digital Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.7 Electronic Equipment Location: The BPA Chehalis-Covington project would take place at the Chehalis Substation, in Lewis County, WA, at the Covington Substation, in King County, WA and at Tacoma Power's (TPWR) South Tacoma Substation in Pierce County, WA. Proposed by: BPA Description of the Proposed Action: The BPA and TPWR have developed a joint plan to convert the microwave transfer trip signals

132

Numerical Simulation of the Flow of a Power Law Fluid in an Elbow Bend  

E-Print Network (OSTI)

A numerical study of flow of power law fluid in an elbow bend has been carried out. The motivation behind this study is to analyze the velocity profiles, especially the pattern of the secondary flow of power law fluid in a bend as there are several...

Kanakamedala, Karthik

2010-07-14T23:59:59.000Z

133

Wind power application for low flow irrigation from the Edwards-Trinity aquifer of West Texas  

E-Print Network (OSTI)

for this region. A relationship of flow pumped from a wind powered pumping system was developed to better predict flow rate based on available wind speed and pumping water depth data.The economic analysis of this system showed that if the local utility sold power...

Molla, Saiful Islam

2012-06-07T23:59:59.000Z

134

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

E-Print Network (OSTI)

clean and efficient energy conversion in power systems," inSteam Power Plant," in Energy conversion, YG Goswami and Fazeotropic mixture energy conversion," Energy Conversion and

Ho, Tony

2012-01-01T23:59:59.000Z

135

Security of Information Flow in the Electric Power Grid  

Science Journals Connector (OSTI)

The confidentiality of information in a system can be breached through unrestricted information flow. The formal properties of non-deducibility and non-inference are often used to assess information flow in purel...

Han Tang; Bruce McMillin

2008-01-01T23:59:59.000Z

136

Electronic Power Conversion System for an Advanced Mobile Generator Set Leon M. Tolbert1,3  

E-Print Network (OSTI)

. The military generator set uses an internal combustion diesel engine to drive a radial-gap permanent magnet. The variable frequency, variable voltage produced by the permanent magnet alternator is diode-rectified to dc synchronous machines are presently used to convert the mechanical power of the rotating shaft into three

Tolbert, Leon M.

137

A Fuzzy Logic Based Power Electronic System for Wind Energy Conversion Scheme  

Science Journals Connector (OSTI)

This paper used fuzzy logic theory to study the behavior of a simple pulse width modulated three phase voltage controlled VSI, which feeds a weak ac network with power produced from an offshore wind farm (WF) of induction generators. Its control system, ...

Lata Gidwani; Rajesh Kumar

2007-12-01T23:59:59.000Z

138

Analysis of the Lattice-Boltzmann-Based Code PowerFLOW: Flow Through a Parallel Confined Jet  

SciTech Connect

Recent advances in the development and practical implementation of the Lattice-Boltzmann (LB) method as applied to computational fluid dynamics (CFD) have spurred much interest. A simple literature search of this area yielded well over 200 articles published in the open literature since 1997. The key advantage of the LB method is the time-accurate simulation of complex flow phenomena that are intractable with traditional methods. Analysis of flow in a parallel confined jet (PCJ) has been performed using the commercial LB-based CFD code PowerFLOW (Exa Corporation, Lexington, MA, USA). Results are compared to both experimental data and numerical results given in the literature, and it was observed that PowerFLOW does very well in accurately emulating the PJC experimental data as compared to Reynolds-Averaged Navier-Stokes schemes. In addition, the inherently transient nature of the LB method allowed the analysis of time-dependent aspects of jet flows (e.g., flapping).

S.J. Vinay III; J.R. Buchanan, Jr.

2002-08-23T23:59:59.000Z

139

Nanorod Niobium Oxide as Powerful Catalysts for an All Vanadium Redox Flow Battery  

Science Journals Connector (OSTI)

Nanorod Niobium Oxide as Powerful Catalysts for an All Vanadium Redox Flow Battery ... A powerful low-cost electrocatalyst, nanorod Nb2O5, is synthesized using the hydrothermal method with monoclinic phases and simultaneously deposited on the surface of a graphite felt (GF) electrode in an all vanadium flow battery (VRB). ... Flow battery cyclic performance also demonstrates the excellent stability of the as prepared Nb2O5 catalyst enhanced electrode. ...

Bin Li; Meng Gu; Zimin Nie; Xiaoliang Wei; Chongmin Wang; Vincent Sprenkle; Wei Wang

2013-11-26T23:59:59.000Z

140

Fuel processor for fuel cell power system. [Conversion of methanol into hydrogen  

DOE Patents (OSTI)

A catalytic organic fuel processing apparatus, which can be used in a fuel cell power system, contains within a housing a catalyst chamber, a variable speed fan, and a combustion chamber. Vaporized organic fuel is circulated by the fan past the combustion chamber with which it is in indirect heat exchange relationship. The heated vaporized organic fuel enters a catalyst bed where it is converted into a desired product such as hydrogen needed to power the fuel cell. During periods of high demand, air is injected upstream of the combustion chamber and organic fuel injection means to burn with some of the organic fuel on the outside of the combustion chamber, and thus be in direct heat exchange relation with the organic fuel going into the catalyst bed.

Vanderborgh, N.E.; Springer, T.E.; Huff, J.R.

1986-01-28T23:59:59.000Z

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


141

The capacitively coupled converter (C³) for high power DC-DC conversion  

E-Print Network (OSTI)

5 11 12 14 17 17 25 26 27 29 29 42 45 48 48 51 51 CHAPTER VI ANALYSIS OF C' USING S. SPACEAVERAGING . . The General Converter. . . The C Coupling Capacitor Voltage VI S~RY AND CONCLUSION . Suitability for High Power... signal transient for flyback capacitor voltageVci for special case of starting with fixed D, fixed T, and lower voltage threshold over-ride . . . . 52 5-3 Large signal transient for input inductor current for example in figure 5-2 . 53 5-4 Large signal...

Khan, Shahriar

2012-06-07T23:59:59.000Z

142

A Novel Power Flow Method for Long Term Frequency Stability Analysis  

E-Print Network (OSTI)

This thesis presents a novel approach for a power system to find a practical power flow solution when all the generators in the system have hit their real power output limits, such as some generator units shutting down or load outages. The approach...

Yan, Wenjin

2013-05-06T23:59:59.000Z

143

A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman  

E-Print Network (OSTI)

A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman Indoor Environment Program ABSTRACT This report develops a theoretical description of the hydrodynamic relationship based on a power pipes can be described with a simple power law dependence on pressure, but that the exponent

144

Design issues concerning Iran`s Bushehr nuclear power plant VVER-1000 conversion  

SciTech Connect

On January 8, 1995, the Atomic Energy Organization of Iran (AEOI) signed a contract for $800 million with the Russian Federation Ministry for Atomic Energy (Minatom) to complete Bushehr nuclear power plant (BNPP) unit 1. The agreement called for a Russian VVER-1000/320 pressurized water reactor (PWR) to be successfully installed into the existing German-built BNPP facilities in 5 yr. System design differences, bomb damage, and environmental exposure are key issues with which Minatom must contend in order to fulfill the contract. The AEOI under the Shah of Iran envisioned Bushehr as the first of many nuclear power plants, with Iran achieving 24 GW(electric) by 1993 and 34 GW(electric) by 2000. Kraftwerk Union AG (KWU) began construction of the two-unit plant near the Persian Gulf town of Halileh in 1975. Unit 1 was {approx}80% complete and unit 2 was {approx}50% complete when construction was interrupted by the 1979 Iranian Islamic revolution. Despite repeated AEOI attempts to lure KWU and other companies back to Iran to complete the plant, Western concerns about nuclear proliferation in Iran and repeated bombings of the plant during the 1980-1988 Iran-Iraq war dissuaded Germany from resuming construction.

Carson, C.F. [Lawrence Livermore National Laboratory, CA (United States)

1996-12-31T23:59:59.000Z

145

Flow Shop Scheduling with Peak Power Consumption Constraints  

E-Print Network (OSTI)

To conduct our experiments, we considered a hypothetical flow shop scheduling ... There are two types of machines with different operations: face milling. 16 ...

2012-09-23T23:59:59.000Z

146

A three phase load flow algorithm for Shipboard Power Systems  

E-Print Network (OSTI)

to distribution systems since the assumptions made for transmission systems are not valid for the unique characteristics of distribution systems. A Shipboard Power System (SPS) is a finite inertia electric power system. The generation, transmission...

Medina-Calder?on, M?onica M

2012-06-07T23:59:59.000Z

147

Optimal Power Flow of Multiple Energy Carriers(Geidl and Andersson 2007) |  

Open Energy Info (EERE)

Optimal Power Flow of Multiple Energy Carriers(Geidl and Andersson 2007) Optimal Power Flow of Multiple Energy Carriers(Geidl and Andersson 2007) Home > Groups > Energy Systems Integration Qinsun's picture Submitted by Qinsun(35) Member 15 November, 2012 - 13:04 Literature Review The author proposed a linear static state model for multiple energy carriers. The optimal power flow and economic dispatch was determined. The method is a simple method of integrated system planning The methods used in the paper are linear deterministic system without control signal, optimal power flow and economic dispatch The proposed method stabilized the power grid, reduced the marginal cost of electricity, and increased the marginal cost of natural gas. The strength of the proposed method is following: 1. it is integrated; 2. it secures to converge;

148

Probabilistic flows for reliability evaluation of multiarea power  

E-Print Network (OSTI)

-system enhancement is given. Compu- tational-times data is also presented. Keywords: electric power systems policy which determines how the power is routed in the case of a loss of load. The following/'. This is the probability that a lack of power transfer capability from area i to area j contributes to the loss of load

Gross, George

149

HIGH-VOLTAGE LOW POWER ANALOGUE-TO-DIGITAL CONVERSION FOR ADAPTIVE ARCHITECTURES OF CAPACITIVE VIBRATION ENERGY  

E-Print Network (OSTI)

conversion of the vibration energy. This block is achieved with a successive approximation analogue to achieve optimal electromechanical conversion of the vibration energy. This control requires some (since Cres >> Cstore). Fig. 3 shows that the energy conversion is maximal for a particular range (U1, U2

Boyer, Edmond

150

Free Flow Power Partners to Improve Hydrokinetic Turbine Performance...  

Office of Environmental Management (EM)

as the device performed as expected, with no discernible harm to river-dwelling fish. Free Flow has also completed preliminary designs of utility-scale installations at a...

151

Distributed series reactance: a new approach to realize grid power flow control.  

E-Print Network (OSTI)

??The objective of the proposed research is to develop a cost-effective power flow controller to improve the utilization and reliability of the existing transmission, sub-transmission,… (more)

Johal, Harjeet

2008-01-01T23:59:59.000Z

152

Analysis of operating data related to power and flow distribution in a PWR  

E-Print Network (OSTI)

The analysis of the effects of the uncertainties associated with temperature and power measurements in the Connecticut Yankee Reactor leads to the evaluation of the uncertainty associated with the effective flow factor. ...

Herbin, Henry Christophe

1974-01-01T23:59:59.000Z

153

Unbalanced Three-Phase Power Flow Calculation Based on Newton Method for Micro-Grid  

Science Journals Connector (OSTI)

Because of the connection of distributed generation to energy complementary micro-grid, there are multi-supplying points and loop ... power flow calculation based on Newton method for micro-grid is presented, in ...

Jiang Guixiu; Shu Jie; Wu Zhifeng…

2012-01-01T23:59:59.000Z

154

An Equivalent Network for Load-Flow Analysis of Power Systems  

E-Print Network (OSTI)

AN EQUIVALENT NETWORK FOR LOAD-FLOW ANALYSIS OF POWER SYSTEMS A Thesis by Meri on L. Johnson Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partihl fulfillment of the requirements for the degree... of MASTER OF SCIENCE May, 1960 Major Subject: Electrical Engineering AN EQUIVALENT NETWORK FOR LOAD-FLOW ANALYSIS OF POWER SYSTEMS A Thesis By Merion L. Johnson Approv as to style a d content by (Chairman of Co ittee ) (Head of Department...

Johnson, Merion Luke

1960-01-01T23:59:59.000Z

155

Comparisons of complex network based models and direct current power flow model to analyze power grid vulnerability under intentional attacks  

Science Journals Connector (OSTI)

Abstract Many scholars have applied complex network based models to investigate power grid vulnerability, but how effective are these models to capture the real performance is an interesting topic. This paper selects two typical complex network based models, including a purely topological model (PTM) and a betweenness based model (BBM), as well as a direct current power flow model (DCPFM), to simulate the topology-based and flow-based vulnerability of power grid under degree, betweenness, maximum traffic and importance based intentional attacks. The relationships of vulnerability results from different models are analyzed and discussed for model comparisons. Taking IEEE 300 power grid with line capacity set proportional to tolerant parameter tp as example, the results show that there exists a critical node attack intensity A I = 0.147 , above which the three models produce almost identical topology-based vulnerability results under each attack strategy at any t p ? 1 , while producing identical flow-based vulnerability results from PTM and DCPFM occurs at A I > 0.147 , and A I > 0.73 for BBM and DCPFM, which indicates that the PTM can better approach the DCPFM for flow-based vulnerability analysis under intentional attacks. Similar results are also found for intentional edge attacks and other power grids.

Min Ouyang; Lijing Zhao; Zhezhe Pan; Liu Hong

2014-01-01T23:59:59.000Z

156

Journal of Power Sources 128 (2004) 5460 Microfluidic fuel cell based on laminar flow  

E-Print Network (OSTI)

Journal of Power Sources 128 (2004) 54­60 Microfluidic fuel cell based on laminar flow Eric R a novel microfluidic fuel cell concept that utilizes the occurrence of multi-stream laminar flow of a Y-shaped microfluidic channel in which two liquid streams containing fuel and oxidant merge

Kenis, Paul J. A.

157

Turbulence effects on the wake flow and power production of a horizontal-axis wind turbine  

Science Journals Connector (OSTI)

Abstract This study experimentally investigated the effects of ambient turbulence on the wake flows and power production of a horizontal-axis wind turbine. The approaching flows included low-turbulence smooth flow and grid-generated turbulent flow. The profiles of time-averaged velocity, turbulence intensity and Reynolds stress from the intermediate to the far-wake regions were measured and compared for smooth and turbulent flows. Based on the measured data, prediction models for the centerline velocity deficit, turbulence intensity, wake radius and velocity profile were proposed. In addition, the experimental results showed that the power productions in the grid-generated turbulent flows were slightly higher than that in the smooth flow. But the power loss due to the velocity deficit in the wake flow was larger than 50% when the downwind distance was less than 12D (D is the rotor diameter). An empirical relation between the power production and the downwind distance x and lateral distance y was proposed.

Chia-Ren Chu; Pei-Hung Chiang

2014-01-01T23:59:59.000Z

158

Optimal mixing and optimal stirring for fixed energy, fixed power or fixed palenstrophy flows  

E-Print Network (OSTI)

Optimal mixing and optimal stirring for fixed energy, fixed power or fixed palenstrophy flows-time perfect mixing with a finite energy constraint on the stirring flow. On the other hand, using techniques, University of Michigan, Ann Arbor, MI 48109 (Dated: 31 March 2012) We consider passive scalar mixing

Novikov, Alexei

159

A power–flow analysis based on continuum dynamics  

Science Journals Connector (OSTI)

...first-order partial differential equation which does not directly correspond to the equation...respect to x, so that a choice of = 0 does not affect the value of the energy-flow...and slip damping. In Shock and vibration handbook (ed. C. M. Harris & C. E. Crede...

1999-01-01T23:59:59.000Z

160

Similarity flow solutions of a non-Newtonian power-law fluid Mohamed Guedda, Zakia Hammouch  

E-Print Network (OSTI)

for a steady-state laminar bound- ary layer flow, governed by the Ostwald-de Wael power-law model-Newtonian fluid mechanics is the Ostwald-de Wael model (with a power-law rheology [2, 3, 4, 5, 6]), which

Paris-Sud XI, Université de

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


161

Flow Noise Prediction and Control in Steam Piping Systems for Nuclear Power Plants  

Science Journals Connector (OSTI)

The flow noise of steam in pipe lines particularly in power plants is a major noise source and contributor to OSHA noise problems. The ability to predict flow noise levels is vital to efficient and economical noise control. Octave?band measurements of flow noise in the main steam piping system of a nuclear power plant were made. To determine the effect of velocity measurements were conducted for a wide range of velocities during plant start?up. Results in the form of plots of measured flow noise as a function of velocity were compared with limited data that have been recently published. An empirical formula for prediction of flow noise and corresponding design techniques for control of noise by proper pipe sizing have been developed. Alternate methods of noise control are reviewed.

F. H. Brittain; S. W. Giampapa

1973-01-01T23:59:59.000Z

162

Comparisons of purely topological model, betweenness based model and direct current power flow model to analyze power grid vulnerability  

Science Journals Connector (OSTI)

This paper selects three frequently used power grid models including a purely topological model (PTM) a betweennness based model (BBM) and a direct current power flow model (DCPFM) to describe three different dynamical processes on a power grid under both single and multiple component failures. Each of the dynamical processes is then characterized by both a topology-based and a flow-based vulnerability metrics to compare the three models with each other from the vulnerability perspective. Taking as an example the IEEE 300 power grid with line capacity set proportional to a tolerance parameter tp the results show non-linear phenomenon: under single node failures there exists a critical value of tp?=?1.36 above which the three models all produce identical topology-based vulnerability results and more than 85% nodes have identical flow-based vulnerability from any two models; under multiple node failures that each node fails with an identical failure probability fp there exists a critical fp?=?0.56 above which the three models produce almost identical topology-based vulnerability results at any tp???1 but producing identical flow-based vulnerability results only occurs at fp?=?1. In addition the topology-based vulnerability results can provide a good approximation for the flow-based vulnerability under large fp and the priority of PTM and BBM to better approach the DCPFM for vulnerability analysis mainly depends on the value of fp. Similar results are also found for other failure types other system operation parameters and other power grids.

2013-01-01T23:59:59.000Z

163

High Average Power Laser Gain Medium With Low Optical Distortion Using A Transverse Flowing Liquid Host  

DOE Patents (OSTI)

A high average power, low optical distortion laser gain media is based on a flowing liquid media. A diode laser pumping device with tailored irradiance excites the laser active atom, ion or molecule within the liquid media. A laser active component of the liquid media exhibits energy storage times longer than or comparable to the thermal optical response time of the liquid. A circulation system that provides a closed loop for mixing and circulating the lasing liquid into and out of the optical cavity includes a pump, a diffuser, and a heat exchanger. A liquid flow gain cell includes flow straighteners and flow channel compression.

Comaskey, Brian J. (Walnut Creek, CA); Ault, Earl R. (Livermore, CA); Kuklo, Thomas C. (Oakdale, CA)

2005-07-05T23:59:59.000Z

164

DC Optimal Power Flow Formulation in AMES Leigh Tesfatsion  

E-Print Network (OSTI)

@iastate.edu, http://www.econ.iastate.edu/tesfatsi/ Fig. 1. AMES day-ahead energy market activities during each day D wholesale power market testbed. I. AMES TESTBED The latest version of AMES (Agent-based Modeling.econ.iastate.edu/tesfatsi/AMESLMPDetermination.LT.pdf this objective, the ISO operates a day-ahead energy market settled by means of LMP. The welfare of each LSE j

Tesfatsion, Leigh

165

Power flow in a gun-injected spheromak plasma  

Science Journals Connector (OSTI)

We describe results from the gun-injected spheromak device SPHEX, which show that the power required to sustain the plasma is initially deposited in a column, about 8 cm in radius, along the geometric axis of the device, and is transmitted from the column to the remainder of the plasma by a radially propagating oscillation at about 20 kHz. These results are relevant to the process of relaxation in spheromak systems.

P. K. Browning; G. Cunningham; S. J. Gee; K. J. Gibson; A. al-Karkhy; D. A. Kitson; R. Martin; M. G. Rusbridge

1992-03-16T23:59:59.000Z

166

Solution-Derived ZnO Homojunction Nanowire Films on Wearable Substrates for Energy Conversion and Self-Powered Gesture Recognition  

Science Journals Connector (OSTI)

Solution-Derived ZnO Homojunction Nanowire Films on Wearable Substrates for Energy Conversion and Self-Powered Gesture Recognition ... As more donor sources are produced, the depletion of free holes makes the material more insulating (green curve in Figure 2b). ... As the concn. of intrinsic defects becomes sufficiently high in O-deficient ZnO, interactions between defects lead to a significant redn. in their formation energies. ...

Ken C. Pradel; Wenzhuo Wu; Yong Ding; Zhong Lin Wang

2014-11-25T23:59:59.000Z

167

Determination of Thermal-Degradation Rates of Some Candidate Rankine-Cycle Organic Working Fluids for Conversion of Industrial Waste Heat Into Power  

E-Print Network (OSTI)

DETERMINATION OF THERMAL-DEGRADATION RATES OF SOME CANDIDATE RANKINE-CYCLE ORGANIC WORKING FLUIDS FOR CONVERSION OF INDUSTRIAL WASTE HEAT INTO POWER Mohan L. Jain, Jack Demirgian, John L. Krazinski, and H. Bushby Argonne National Laboratory..., Argonne, Illinois Howard Mattes and John Purcell U.S. Department of Energy ABSTRACT Serious concerns over the long-term thermal In a previous study [1] based on systems stability of organic working fluids and its effect analysis and covering...

Jain, M. L.; Demirgian, J.; Krazinski, J. L.; Bushby, H.; Mattes, H.; Purcell, J.

1984-01-01T23:59:59.000Z

168

Optical parametric master oscillator and power amplifier for efficient conversion of high-energy pulses with high beam quality  

Science Journals Connector (OSTI)

We describe a system for parametric conversion of high-energy,Q-switched laser pulses from 1.064 µm to 2.1 µm in KTiOPO4. High beam quality and efficiency are obtained...

Arisholm, Gunnar; Nordseth, ??rnulf; Rustad, Gunnar

2004-01-01T23:59:59.000Z

169

Probabilistic load flow with versatile non-Gaussian power injections  

Science Journals Connector (OSTI)

Abstract A probabilistic load flow distinguished by the versatility in the way in which input data can be provided is presented. The main contribution of the proposal involves taking advantage of the data available as well as completing any missing information. This enables the proposal to be applied at any voltage level, even in medium-voltage networks where there is a glaring lack of systematic data collection. The use of the Gaussian Mixture Model is also a key feature of the proposed solution, and determinant in the final solution. Not only does the detailed and thorough analysis through numerous tests demonstrate the good performance of the proposed procedure, but it also confirms the accuracy of the results.

Cristina Carmona-Delgado; Esther Romero-Ramos; Jesús Riquelme-Santos

2015-01-01T23:59:59.000Z

170

220 kV SSSC device for power flow control (Smart Grid Project) | Open  

Open Energy Info (EERE)

kV SSSC device for power flow control (Smart Grid Project) kV SSSC device for power flow control (Smart Grid Project) Jump to: navigation, search Project Name 220 kV SSSC device for power flow control Country Spain Headquarters Location Catalonia, Spain Coordinates 41.59116°, 1.520862° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.59116,"lon":1.520862,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

171

Centralized wind power plant voltage control with optimal power flow algorithm.  

E-Print Network (OSTI)

??This thesis presents a method of controlling the reactive power injected into a medium-voltage collection system by multiple wind turbine generators such that the voltage… (more)

Kline, Jared Andrew

2011-01-01T23:59:59.000Z

172

Nonlinear power flow control applications to conventional generator swing equations subject to variable generation.  

SciTech Connect

In this paper, the swing equations for renewable generators are formulated as a natural Hamiltonian system with externally applied non-conservative forces. A two-step process referred to as Hamiltonian Surface Shaping and Power Flow Control (HSSPFC) is used to analyze and design feedback controllers for the renewable generator system. This formulation extends previous results on the analytical verification of the Potential Energy Boundary Surface (PEBS) method to nonlinear control analysis and design and justifies the decomposition of the system into conservative and non-conservative systems to enable a two-step, serial analysis and design procedure. In particular, this approach extends the work done by developing a formulation which applies to a larger set of Hamiltonian Systems that has Nearly Hamiltonian Systems as a subset. The results of this research include the determination of the required performance of a proposed Flexible AC Transmission System (FACTS)/storage device to enable the maximum power output of a wind turbine while meeting the power system constraints on frequency and phase. The FACTS/storage device is required to operate as both a generator and load (energy storage) on the power system in this design. The Second Law of Thermodynamics is applied to the power flow equations to determine the stability boundaries (limit cycles) of the renewable generator system and enable design of feedback controllers that meet stability requirements while maximizing the power generation and flow to the load. Necessary and sufficient conditions for stability of renewable generators systems are determined based on the concepts of Hamiltonian systems, power flow, exergy (the maximum work that can be extracted from an energy flow) rate, and entropy rate.

Robinett, Rush D., III; Wilson, David Gerald

2010-05-01T23:59:59.000Z

173

A Merged two-stage power conversion architecture with switched capacitor circuit for an LED driver module  

E-Print Network (OSTI)

In a power converter specified to convert from wide-range and high-level DC voltage or AC line voltage to low-level DC voltage, satisfying high efficiency, high power density, and high power factor is challenging because ...

Lim, Seungbum

2012-01-01T23:59:59.000Z

174

Energy confinement studies in the tandem mirror experiment (TMX): Power flow  

Science Journals Connector (OSTI)

Using the measured plasma densities and energies the flow of power between the different particle species and regions of the tandem mirror experiment (TMX) is analyzed. The power flow is described by a simple classical model modified to include: (1) a halo of cool plasma that reduces end?cell ion losses due to charge exchange on background gas (2) instability heating of the central?cell ions both in the central cell and as they escape through the plugs (3) electron energy transport along the field lines which is less than predicted and (4) radial transport of the central?cell ions. Our global power balance including all particles and regions accounts for 87±27% of the trapped neutral?beam power.

D. P. Grubb; S. L. Allen; T. A. Casper; J. F. Clauser; F. H. Coensgen; R. H. Cohen; D. L. Correll; W. C. Cummins; J. C. Davis; R. P. Drake; J. H. Foote; A. H. Futch; R. K. Goodman; G. E. Gryczkowski; E. B. Hooper Jr.; R. S. Hornady; A. L. Hunt; C. V. Karmendy; W. E. Nexsen; W. L. Pickles; G. D. Porter; P. Poulsen; T. D. Rognlien; T. C. Simonen; D. R. Slaughter; P. Coakley; G. A. Hallock; O. T. Strand

1983-01-01T23:59:59.000Z

175

Wave Energy Conversion Technology  

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

Wave Energy Conversion Technology Wave Energy Conversion Technology Speaker(s): Mirko Previsic Date: August 2, 2001 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Julie Osborn Scientists have been working on wave power conversion for the past twenty years, but recent advances in offshore and IT technologies have made it economically competitive. Sea Power & Associates is a Berkeley-based renewable energy technology company. We have developed patented technology to generate electricity from ocean wave energy using a system of concrete buoys and highly efficient hydraulic pumps. Our mission is to provide competitively priced, non-polluting, renewable energy for coastal regions worldwide. Mirko Previsic, founder and CEO, of Sea Power & Associates will discuss ocean wave power, existing technologies for its conversion into

176

HHFW Power Flow Along Magnetic Field Lines In The Scrape-off Layer of NSTX  

SciTech Connect

A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast wave heating and current drive.

Rory Perkins, et. al.

2012-02-27T23:59:59.000Z

177

A New Model of Centrality Measure based on Bidirectional Power Flow for  

E-Print Network (OSTI)

power flow based model to evaluate the criticality in smart grid environment. Change in direction of smart grid includes various generation options, primarily in the distribution side ­ near consumers. Engagement of customers with the energy management systems is the most lucrative part of smart grid from

Pota, Himanshu Roy

178

Two-phase power-law modeling of pipe flows displaying shear-thinning phenomena  

SciTech Connect

This paper describes work in modeling concentrated liquid-solids flows in pipes. COMMIX-M, a three-dimensional transient and steady-state computer program developed at Argonne National Laboratory, was used to compute velocities and concentrations. Based on the authors` previous analyses, some concentrated liquid-solids suspension flows display shear-thinning rather than Newtonian phenomena. Therefore, they developed a two-phase non-Newtonian power-law model that includes the effect of solids concentration on solids viscosity. With this new two-phase power-law solids-viscosity model, and with constitutive relationships for interfacial drag, virtual mass effect, shear lift force, and solids partial-slip boundary condition at the pipe walls, COMMIX-M is capable of analyzing concentrated three-dimensional liquid-solids flows.

Ding, Jianmin; Lyczkowski, R.W.; Sha, W.T.

1993-12-31T23:59:59.000Z

179

A fuzzy logic supervisor for active and reactive power control of a variable speed wind energy conversion system associated to a flywheel storage system  

Science Journals Connector (OSTI)

In this paper, we propose a Wind Energy Conversion System (WECS) at variable speed using a Doubly Fed Induction Generator (DFIG) controlled on the rotor side through converters. A Flywheel Energy Storage System (FESS) is connected to the studied wind generator at the DC bus in order to evaluate its capacity to participate to the ancillary services. We study the improvement of the active and reactive power quality produced by the wind generator and its effect on the load voltage regulation connected to the wind generator. For that, a fuzzy logic supervisor is established to control the FESS operation and the DC bus voltage in order to smooth the active power fluctuations due to the random wind speed variations. A control law is also described to smooth the reactive power at the connection node to the grid.

Lilia Jerbi; Lotfi Krichen; Abderrazak Ouali

2009-01-01T23:59:59.000Z

180

Biochemical Conversion | Department of Energy  

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

by enhancing fuel yields in integrated biorefineries which combine conversion types with heat and power efficiencies to produce fuel and products. Lignocellulose (mainly lignin,...

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


181

Chance Constrained Optimal Power Flow: Risk-Aware Network Control under Uncertainty  

E-Print Network (OSTI)

When uncontrollable resources fluctuate, Optimum Power Flow (OPF), routinely used by the electric power industry to re-dispatch hourly controllable generation (coal, gas and hydro plants) over control areas of transmission networks, can result in grid instability, and, potentially, cascading outages. This risk arises because OPF dispatch is computed without awareness of major uncertainty, in particular fluctuations in renewable output. As a result, grid operation under OPF with renewable variability can lead to frequent conditions where power line flow ratings are significantly exceeded. Such a condition, which is borne by simulations of real grids, would likely resulting in automatic line tripping to protect lines from thermal stress, a risky and undesirable outcome which compromises stability. Smart grid goals include a commitment to large penetration of highly fluctuating renewables, thus calling to reconsider current practices, in particular the use of standard OPF. Our Chance Constrained (CC) OPF correct...

Bienstock, Daniel; Harnett, Sean

2012-01-01T23:59:59.000Z

182

Architectures and circuits for low-voltage energy conversion and applications in renewable energy and power management  

E-Print Network (OSTI)

In this thesis we seek to develop smaller, less expensive, and more efficient power electronics. We also investigate emerging applications where the proper implementation of these new types of power converters can have a ...

Pilawa-Podgurski, Robert C. N

2012-01-01T23:59:59.000Z

183

Plant Design and Cost Assessment of Forced Circulation Lead-Bismuth Cooled Reactor with Conventional Power Conversion Cycles  

E-Print Network (OSTI)

Cost of electricity is the key factor that determines competitiveness of a power plant. Thus the proper selection, design and optimization of the electric power generating cycle is of main importance. This report makes an ...

Dostal, Vaclav

184

Network flow model for multi-energy systems  

Science Journals Connector (OSTI)

This paper describes a novel approach to model networks with multiple energy carrier. The proposed nodal matrix establishes a link between an optimization of enclosed areas and their interconnections via networks. In the envisioned network flow model ... Keywords: energy conversion, energy hubs, grids, line losses, network flow, optimal power flow

Matthias Schulze; Goran Gašparovi?

2010-02-01T23:59:59.000Z

185

Observation of ion cyclotron range of frequencies mode conversion plasma flow drive on Alcator C-Mod  

E-Print Network (OSTI)

At modest [superscript 3]He levels (n[subscript 3He]/n[subscript e]~8%–12%), in relatively low density D([superscript 3]He) plasmas, [overline n]e<=1.3×10[superscript 20] m[superscript ?3], heated with 50 MHz rf power at ...

Lin, Yijun

186

1112 IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 25, NO. 4, DECEMBER 2010 Short-Horizon Prediction of Wind Power  

E-Print Network (OSTI)

(wind energy in particular) has grown sig- nificantly in the last years. As a relatively new industry, wind energy must address numerous questions, including providing accurate short-term prediction of wind of the generated power [1]. Long-term wind speed and power prediction is of interest to management of energy

Kusiak, Andrew

187

Flow simulation of the Component Development Integration Facility magnetohydrodynamic power train system  

SciTech Connect

This report covers application of Argonne National Laboratory`s (ANL`s) computer codes to simulation and analysis of components of the magnetohydrodynamic (MHD) power train system at the Component Development and Integration Facility (CDIF). Major components of the system include a 50-MWt coal-fired, two-stage combustor and an MHD channel. The combustor, designed and built by TRW, includes a deswirl section between the first and the second-stage combustor and a converging nozzle following the second-stage combustor, which connects to the MHD channel. ANL used computer codes to simulate and analyze flow characteristics in various components of the MHD system. The first-stage swirl combustor was deemed a mature technology and, therefore, was not included in the computer simulation. Several versions of the ICOMFLO computer code were used for the deswirl section and second-stage combustor. The MGMHD code, upgraded with a slag current leakage submodel, was used for the MHD channel. Whenever possible data from the test facilities were used to aid in calibrating parameters in the computer code, to validate the computer code, or to set base-case operating conditions for computations with the computer code. Extensive sensitivity and parametric studies were done on cold-flow mixing in the second-stage combustor, reacting flow in the second-stage combustor and converging nozzle, and particle-laden flow in the deswirl zone of the first-stage combustor, the second-stage combustor, and the converging nozzle. These simulations with subsequent analysis were able to show clearly in flow patterns and various computable measures of performance a number of sensitive and problematical areas in the design of the power train. The simulations of upstream components also provided inlet parameter profiles for simulation of the MHD power generating channel. 86 figs., 18 tabs.

Chang, S.L.; Lottes, S.A.; Bouillard, J.X.; Petrick, M.

1997-11-01T23:59:59.000Z

188

Engineering Predictions in Industrial and Power Flows Using the Retrograde Condensation Curve. Part I-Methodology  

E-Print Network (OSTI)

Industrial and power systems rely on engineering predictions of the flow properties of working fluids. The paper proposes a way of the utilization of the vapor quality values along the new retrograde condensation curve in the generation of the void fraction design guidelines and reliable prediction of the saturated liquid specific volumes/densities. The new procedure eliminates the involvement of semi-empirical relationships like rectilinear diameter and other similar models.

Labinov, Mark S

2014-01-01T23:59:59.000Z

189

An Energy-Flow Model for Self-Powered Routers and its Application for Energy-Aware Routing  

E-Print Network (OSTI)

of electrical energy. Depen- dence on renewable energy sources and variable power consump- tion make energy trend estimation we develop an energy flow model that accounts for communication and energy, network devices are self-powered, i.e., powered by energy harvested from renewable sources such as wind

Belding-Royer, Elizabeth M.

190

The Mercury Project: A High Average Power, Gas-Cooled Laser with Frequency Conversion and Wavefront Correction  

Science Journals Connector (OSTI)

The Mercury laser operated continuously for several hours at 55J and 10Hz with fourteen 4x6cm2 Yb:S-FAP amplifier slabs pumped by eight 100kW diode arrays. Average power frequency...

Bayramian, Andy J

191

Using conversions of chemically reacting tracers for numerical determination of temperature profiles in flowing systems and temperature histories in batch systems  

SciTech Connect

This report presents the mathematical bases for measuring internal temperatures within batch and flowing systems using chemically reacting tracers. This approach can obtain temperature profiles of plug-flow systems and temperature histories within batch systems. The differential equations for reactant conversion can be converted into Fredholm integral equations of the first kind. The experimental variable is the tracer-reaction activation energy. When more than one tracer is used, the reactions must have different activation energies to gain information. In systems with temperature extrema, multiple solutions for the temperature profiles or histories can exist, When a single parameter in the temperature distribution is needed, a single-tracer test may furnish this information. For multi-reaction tracer tests, three Fredholm equations are developed. Effects of tracer-reaction activation energy, number of tracers used, and error in the data are evaluated. The methods can determine temperature histories and profiles for many existing systems, and can be a basis for analysis of the more complicated dispersed-flow systems. An alternative to using the Fredholm-equation approach is the use of an assumed temperature- distribution function and incorporation of this function into the basic integral equation describing tracer behavior. The function contains adjustable parameters which are optimized to give the temperature distribution. The iterative Fredholm equation method is tested to see what is required to discriminate between two models of the temperature behavior of Hot Dry Rock (HDR) geothermal reservoirs. Experimentally, ester and amide hydrolyses are valid HDR tracer reactions for measuring temperatures in the range 75-100{degrees}C. Hydrolyses of bromobenzene derivatives are valid HDR tracer reactions for measuring temperatures in the range 150-275{degrees}C.

Brown, L.F.; Chemburkar, R.M.; Robinson, B.A.; Travis, B.J.

1996-04-01T23:59:59.000Z

192

Manufacture and properties of continuous grain flow crankshafts for locomotive and power generation diesel engines  

SciTech Connect

The bulk of the large crankshaft production volume is associated with the medium speed diesel engine market. These engines have seen intense development to obtain higher power outputs without change in the physical size of the crankshaft and at the same time there has been continuing pressure to reduce costs. Fatigue and bearing normal wear are the major technical hurdles that threaten the crankshaft life, and measures for dealing with these issues are described. Continuous grain flow (CGF) crankshafts are responsible for the continued integrity of these enhanced power output engines and the production of these crankshafts is described. Comparisons are made with the older slab forging crankshaft production method. The demand for the medium speed diesel engine and its natural gas derivative is strong and supports an aggressive engine building industry serving locomotive, marine and power generation markets. This demand in turn relies on practical national standards that serve the needs of the engine builder, material supplier and the end user.

Antos, D.J.; Nisbett, E.G. [National Forge Co., Irvine, PA (United States)

1997-12-31T23:59:59.000Z

193

Similarity Flow Solutions of a Non-Newtonian Power-law Fluid  

E-Print Network (OSTI)

In this paper we present a mathematical analysis for a steady-state laminar boundary layer flow, governed by the Ostwald-de Wael power-law model of an incompressible non- Newtonian fluid past a semi-infinite power-law stretched flat plate with uniform free stream velocity. A generalization of the usual Blasius similarity transformation is used to find similarity solutions [1]. Under appropriate assumptions, partial differential equations are transformed into an autonomous third-order nonlinear degenerate ordinary differential equation with boundary conditions. Using a shooting method, we establish the existence of an infinite number of global unbounded solutions. The asymptotic behavior is also discussed. Some properties of those solutions depend on the viscosity power-law index.

Guedda, Mohamed

2009-01-01T23:59:59.000Z

194

Abstract--The optimal power flow (OPF) problem is a critical problem for power generation and is generally non-convex. This  

E-Print Network (OSTI)

voltage lines with voltage magnitudes below 100 kV. Traditionally OPF problem mainly focus on transmission generators to areas in need, the networks' voltages are typically above 100 kV. Distribution networks flow on the line P: vector of active power generations Q: vector of reactive power generations L: loss

Lavaei, Javad

195

A risk-averse security-constrained optimal power flow for a power grid subject to hurricanes  

Science Journals Connector (OSTI)

Abstract During the course of a hurricane, many components in the power grid may be affected. In particular, loss of transmission lines and/or towers due to excess wind conditions may adversely impact the operation of the grid and force a re-dispatch of the generation units. However, large generation units have considerable ramp rates and usually are not able to vary their outputs fast enough. This might lead to temporary imbalances between load and generation that, if not resolved quickly, may result in more severe cascading failures. When a large scale disturbance such as a hurricane is forthcoming it is most beneficial to proactively dispatch the grid so as to minimize the likelihood of future failures. To assist the operator in proactively responding to an imminent event such as a hurricane, a risk-averse generation dispatch model is presented in this paper based on security-constrained AC optimal power flow. To perform (N–k) contingency analysis, a geospatial model of the power grid is developed that allows for the computation of outage probabilities of the transmission lines affected by the hurricane wind fields. Statistical analysis has been performed on the historical data on the past hurricane events in the US in order to simulate realistic hurricane scenarios. The IEEE 118-bus test system has been mapped onto the map of the state of Texas in order to provide a realistic test bed. The proposed algorithm takes into account the cost of operation, as well as the risks associated with overload and over/undervoltage conditions. Moreover, it allows for preventive as well as corrective dispatch of the power grid.

Pirooz Javanbakht; Salman Mohagheghi

2014-01-01T23:59:59.000Z

196

Wind energy conversion system  

DOE Patents (OSTI)

The wind energy conversion system includes a wind machine having a propeller connected to a generator of electric power, the propeller rotating the generator in response to force of an incident wind. The generator converts the power of the wind to electric power for use by an electric load. Circuitry for varying the duty factor of the generator output power is connected between the generator and the load to thereby alter a loading of the generator and the propeller by the electric load. Wind speed is sensed electro-optically to provide data of wind speed upwind of the propeller, to thereby permit tip speed ratio circuitry to operate the power control circuitry and thereby optimize the tip speed ratio by varying the loading of the propeller. Accordingly, the efficiency of the wind energy conversion system is maximized.

Longrigg, Paul (Golden, CO)

1987-01-01T23:59:59.000Z

197

An adaptive load dispatching and forecasting strategy for a virtual power plant including renewable energy conversion units  

Science Journals Connector (OSTI)

Abstract The increasing awareness on the risky state of conventional energy sources in terms of future energy supply security and health of environment has promoted the research activities on alternative energy systems. However, due to the fact that the power production of main alternative sources such as wind and solar is directly related with meteorological conditions, these sources should be combined with dispatchable energy sources in a hybrid combination in order to ensure security of demand supply. In this study, the evaluation of such a hybrid system consisting of wind, solar, hydrogen and thermal power systems in the concept of virtual power plant strategy is realized. An economic operation-based load dispatching strategy that can interactively adapt to the real measured wind and solar power production values is proposed. The adaptation of the load dispatching algorithm is provided by the update mechanism employed in the meteorological condition forecasting algorithms provided by the combination of Empirical Mode Decomposition, Cascade-Forward Neural Network and Linear Model through a fusion strategy. Thus, the effects of the stochastic nature of solar and wind energy systems are better overcome in order to participate in the electricity market with higher benefits.

A. Tascikaraoglu; O. Erdinc; M. Uzunoglu; A. Karakas

2014-01-01T23:59:59.000Z

198

Numerical Polynomial Homotopy Continuation Method to Locate All The Power Flow Solutions  

E-Print Network (OSTI)

The manuscript addresses the problem of finding all solutions of power flow equations or other similar nonlinear system of algebraic equations. This problem arises naturally in a number of power systems contexts, most importantly in the context of direct methods for transient stability analysis and voltage stability assessment. We introduce a novel form of homotopy continuation method called the numerical polynomial homotopy continuation (NPHC) method that is mathematically guaranteed to find all the solutions without ever encountering a bifurcation. The method is based on embedding the real form of power flow equation in complex space, and tracking the generally unphysical solutions with complex values of real and imaginary parts of the voltage. The solutions converge to physical real form in the end of the homotopy. The so-called $\\gamma$-trick mathematically rigorously ensures that all the paths are well-behaved along the paths, so unlike other continuation approaches, no special handling of bifurcations is necessary. The method is \\textit{embarrassingly parallelizable} and can be applied to reasonably large sized systems. We demonstrate the technique by analysis of several standard test cases up to the 14-bus system size. Finally, we discuss possible strategies for scaling the method to large size systems, and propose several applications for transient stability analysis and voltage stability assessment.

Dhagash Mehta; Hung Nguyen; Konstantin Turitsyn

2014-08-12T23:59:59.000Z

199

Thermoelectric Conversion of Waste Heat to Electricity in an...  

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

truck system. schock.pdf More Documents & Publications Thermoelectric Conversion of Wate Heat to Electricity in an IC Engine Powered Vehicle Thermoelectric Conversion of Waste...

200

AVTA: Vehicle to Grid Power Flow Regulations and Building Codes Review  

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

The Vehicle Technologies Office's Advanced Vehicle Testing Activity carries out testing on a wide range of advanced vehicles and technologies on dynamometers, closed test tracks, and on-the-road. These results provide benchmark data that researchers can use to develop technology models and guide future research and development. The following report is a review of Vehicle-to-Grid power flow regulations and building codes, as informed by the AVTA's testing on plug-in electric vehicle charging equipment. This research was conducted by Idaho National Laboratory.

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


201

Optimal Power Flow Formulation in Market of Retail Wheeling Taiyou Yong, Student Member, IEEE Robert Lasseter, Fellow, IEEE  

E-Print Network (OSTI)

, transmission and distribution in an area. The rate of electricity is regulated. The market is monopoly. Retail. Optimal power flow is an optimizing tool for power system planning, energy management etc. Use Robert Lasseter, Fellow, IEEE Department of Electrical and Computer Engineering, University of Wisconsin

202

An update on the wind power input to the surface geostrophic flow of the World Ocean  

Science Journals Connector (OSTI)

The rate of working of the surface wind stress on the geostrophic component of the surface flow of the World Ocean is revisited. The global mean is found to be about 0.85 to 1.0 TW. Consistent with previous estimates, about 0.75 to 0.9 TW comes from outside the equatorial region (poleward of 3 ? ). The rate of forcing of fluctuating currents integrates to only about 0.02 TW when the equatorial region is included, or close to zero over the extratropical region. Uncertainty in wind power input due to uncertainty in the surface currents is negligible. Results from several different wind stress products are compared, suggesting that uncertainty in wind stress is the dominant source of error. Ignoring the surface currents’ influence upon wind stress leads to a systematic bias in net wind power input; an overestimate of about 10 to 30%. (In previous estimates this positive bias was offset by too weak winds.) Small-scale, zonally elongated structures in the wind power input were found, but have both positive and negative contributions and lead to little net wind power input.

Robert B. Scott; Yongsheng Xu

2009-01-01T23:59:59.000Z

203

Preliminary studies on the heat exchanger option for S-CO{sub 2} power conversion cycle coupled to water cooled SMR  

SciTech Connect

For more than a half century, the steam Rankine cycle had been the major power conversion cycle for a nuclear power plant. However, as the interest on the next generation reactors grows, a variety of alternative power conversion systems have been studied. Among them, the S-CO{sub 2} cycle (Supercritical carbon dioxide Brayton cycle) is considered as a promising candidate due to several benefits such as 1) Relatively high thermal efficiency at relatively low turbine inlet temperature, 2) High efficiency with simple lay-out 3) Compactness of turbo-machineries. 4) Compactness of total cycle combined with PCHE (Printed Circuit Heat Exchanger). According to the conventional classification of heat exchangers (HE), there are three kind of HE, 1) Tubular HEs, 2) Plate-type HEs, 3) Extended surface HEs. So far, the researcher has mostly assumed PCHE type HE for the S-CO{sub 2} cycle due to its compactness with reasonably low pressure drop. However, PCHE is currently one of the most expensive components in the cycle, which can have a negative effect on the economics of the cycle. Therefore, an alternative for the HE should be seriously investigated. By comparing the operating condition (pressure and temperature) there are three kind of HE in the S-CO{sub 2} cycle, 1) IHX (Intermediate Heat exchanger) 2) Recuperator and 3) Pre-cooler. In each heat exchanger, hot side and cold side coolants are different, i.e. reactor coolant to S-CO{sub 2} (IHX), S-CO{sub 2} to S-CO{sub 2}(Recuperator), S-CO{sub 2} to water (Pre-cooler). By considering all the attributes mentioned above, all existing types of heat exchangers are compared to find a possible alternative to PCHE. The comparing factors are 1) Size(volume), 2) Cost. Plate fin type HEs are considered to be the most competitive heat exchanger regarding the size and the cost after some improvements on the design limit are made. (authors)

Ahn, Y.; Lee, J. [Dept. of Nuclear and Quantum Engineering, Korea Advanced Inst. of Science and Technology, 373-1 Guseong-dong Yuseong-gu, Daejeon, 305-701 (Korea, Republic of); Lee, J. I. [Dept. of Nuclear and Quantum Engineering, Korea Advanced Inst. of Science and Technology, 373-1 Guseong-dong Yuseong-gu, Daejeon, 305-701 (Korea, Republic of); Dept. of Nuclear Engineering, Khalifa Univ. of Science, Technology and Research (KUSTAR), P.O.Box 127788, Abu Dhabi (United Arab Emirates)

2012-07-01T23:59:59.000Z

204

The role of radial particle flow on power balance in DIII-D  

Science Journals Connector (OSTI)

The importance of radial particle flow on the power flowing across the last closed flux surface (separatrix) in DIII-D [Luxon et al. International Conference on Plasma Physics and Controlled Nuclear Fusion (International Atomic Energy Agency Vienna 1986) Vol. I p. 159] is considered. The perpendicular thermal diffusivity at the separatrix is near 1 m2/s in low confinement operation (L-mode) and 0.1 m2/s in high confinement (H-mode). The particle diffusivity is about one-fourth of the thermal diffusivity producing radial particle fluxes of the order of kilo-amperes. The particle flux is 10 to 100 times the particle input from neutral beam sources consistent with core fueling being dominated by neutral recycling. The radial particle flux scales with the neutral pressure in the private flux region suggesting the core is fueled predominantly from neutrals which recycle from the divertor through the private flux and into the core near the singular point where the poloidal field is zero (X-point). There is significant core power loss associated with the large particle flux across the separatrix. The electron temperature measured at the top of the edge pedestal in H-mode operation scales inversely with the particle flux. In turn the core energy confinement scales with the pedestal temperature and hence inversely with the particle flux. The results presented here indicate the global particle confinement time is between 0.5 and 2 times the global energy confinement time.

G. D. Porter; DIII-D team

1998-01-01T23:59:59.000Z

205

Conversion Tables  

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

Carbon Dioxide Information Analysis Center - Conversion Tables Carbon Dioxide Information Analysis Center - Conversion Tables Contents taken from Glossary: Carbon Dioxide and Climate, 1990. ORNL/CDIAC-39, Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee. Third Edition. Edited by: Fred O'Hara Jr. 1 - International System of Units (SI) Prefixes 2 - Useful Quantities in CO2 3 - Common Conversion Factors 4 - Common Energy Unit Conversion Factors 5 - Geologic Time Scales 6 - Factors and Units for Calculating Annual CO2 Emissions Using Global Fuel Production Data Table 1. International System of Units (SI) Prefixes Prefix SI Symbol Multiplication Factor exa E 1018 peta P 1015 tera T 1012 giga G 109 mega M 106 kilo k 103 hecto h 102 deka da 10 deci d 10-1 centi c 10-2

206

Biomass Conversion  

Science Journals Connector (OSTI)

Accounting for all of the factors that go into energy demand (population, vehicle miles traveled per ... capita, vehicle efficiency) and land required for energy production (biomass land yields, biomass conversion

Stephen R. Decker; John Sheehan…

2012-01-01T23:59:59.000Z

207

Micro Electret Energy Harvesting Device with Analogue Impedance Conversion Circuit  

E-Print Network (OSTI)

Micro Electret Energy Harvesting Device with Analogue Impedance Conversion Circuit Yuji Suzuki1 using a low-power-consumption impedance conversion circuit. Key words: Energy harvesting, Electret, CYTOP, Parylene spring, Impedance conversion 1. INTRODUCTION Energy harvesting from environmental

Kasagi, Nobuhide

208

The Coordinated Control of a Central Air Conditioning System Based on Variable Chilled Water Temperature and Variable Chilled Water Flow  

E-Print Network (OSTI)

At present, regulation of water flow by means of pump frequency conversion is one of the major methods for power-saving in central air conditioning systems. In this article, optimization regulation for central air conditioning system on the basis...

Liu, J.; Mai, Y.; Liu, X.

2006-01-01T23:59:59.000Z

209

Transient stability and control of renewable generators based on Hamiltonian surface shaping and power flow control. Part II, analysis.  

SciTech Connect

The swing equations for renewable generators connected to the grid are developed and a wind turbine is used as an example. The swing equations for the renewable generators are formulated as a natural Hamiltonian system with externally applied non-conservative forces. A two-step process referred to as Hamiltonian Surface Shaping and Power Flow Control (HSSPFC) is used to analyze and design feedback controllers for the renewable generators system. This formulation extends previous results on the analytical verification of the Potential Energy Boundary Surface (PEBS) method to nonlinear control analysis and design and justifies the decomposition of the system into conservative and non-conservative systems to enable a two-step, serial analysis and design procedure. The first step is to analyze the system as a conservative natural Hamiltonian system with no externally applied non-conservative forces. The Hamiltonian surface of the swing equations is related to the Equal-Area Criterion and the PEBS method to formulate the nonlinear transient stability problem. This formulation demonstrates the effectiveness of proportional feedback control to expand the stability region. The second step is to analyze the system as natural Hamiltonian system with externally applied non-conservative forces. The time derivative of the Hamiltonian produces the work/rate (power flow) equation which is used to ensure balanced power flows from the renewable generators to the loads. The Second Law of Thermodynamics is applied to the power flow equations to determine the stability boundaries (limit cycles) of the renewable generators system and enable design of feedback controllers that meet stability requirements while maximizing the power generation and flow to the load. Necessary and sufficient conditions for stability of renewable generators systems are determined based on the concepts of Hamiltonian systems, power flow, exergy (the maximum work that can be extracted from an energy flow) rate, and entropy rate. This paper will present the analysis and numerical simulation results for two nonlinear control design examples that include: (1) the One-Machine Infinite Bus (OMIB) system with a Unified Power Flow Controller (UPFC) and (2) the swing equation for a wind turbine connected to an infinite bus through a UPFC to determine the required performance of the UPFC to enable the maximum power output of a wind turbine subject to stochastic inputs while meeting the power system constraints on frequency and phase. The energy storage requirements will also be identified from the UPFC and/or FACTS devices while working in combination with the wind turbine.

Robinett, Rush D., III; Wilson, David Gerald

2010-11-01T23:59:59.000Z

210

A technical, economical and market review of organic Rankine cycles for the conversion of low-grade heat for power generation  

Science Journals Connector (OSTI)

This paper presents an overview of the technical and economic aspects, as well as the market evolution of the Organic Rankine Cycle (ORC). This is an unconventional but very promising technology for the conversion of thermal energy, at low and medium temperatures, into electrical and/or mechanical energy on a small scale. As it makes a greater and/or more intensive use of its energy source, this technology could facilitate an electricity supply to unconnected areas, the self-production of energy, the desalination of seawater for human consumption, or even to increase the energy efficiency in the industrial sector respecting the environment. A look at the scientific publications on this topic shows an open research line, namely the selection of a suitable working fluid for these systems, since there is as yet none that provides all aspects that must be taken into account in ORCs. Furthermore, a description and an analysis of the applications of the proposed technology is carried out, specifying the main providers, which at the present time is limited mainly to the range 0.2–2 MWe with a cost of around 1 and 4 × 103 €/kWe. Lower powers are in pre-commercial status.

Fredy Vélez; José J. Segovia; M. Carmen Martín; Gregorio Antolín; Farid Chejne; Ana Quijano

2012-01-01T23:59:59.000Z

211

Surreptitious interception of conversations with lasers  

Science Journals Connector (OSTI)

Methods are described for surreptitiously intercepting conversations by reflecting a low-power laser beam from a window pane. The essential components and optical configurations of...

Mims III, Forrest M

1985-01-01T23:59:59.000Z

212

Thermochemical Conversion Related Links | Department of Energy  

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

website's Information Resources section. Some key publications are: Using Heat and Chemistry to Make Fuel and Power: Thermochemical Conversion (January 2011) Thermochemical...

213

Ocean Thermal Energy Conversion LUIS A. VEGA  

E-Print Network (OSTI)

Ocean Thermal Energy Conversion LUIS A. VEGA Hawaii Natural Energy Institute, School of Ocean depths of 20 m (surface water) and 1,000 m. OTEC Ocean Thermal Energy Conversion, the process Energy Conversion. At first, OTEC plantships providing electricity, via submarine power cables, to shore

214

Wind energy conversion system  

SciTech Connect

This patent describes a wind energy conversion system comprising: a propeller rotatable by force of wind; a generator of electricity mechanically coupled to the propeller for converting power of the wind to electric power for use by an electric load; means coupled between the generator and the electric load for varying the electric power drawn by the electric load to alter the electric loading of the generator; means for electro-optically sensing the speed of the wind at a location upwind from the propeller; and means coupled between the sensing means and the power varying means for operating the power varying means to adjust the electric load of the generator in accordance with a sensed value of wind speed to thereby obtain a desired ratio of wind speed to the speed of a tip of a blade of the propeller.

Longrigg, P.

1987-03-17T23:59:59.000Z

215

Thermoelectrici Conversion of Waste Heat to Electricity in an...  

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

Thermoelectrici Conversion of Waste Heat to Electricity in an IC Engine-Powered Vehicle Thermoelectrici Conversion of Waste Heat to Electricity in an IC Engine-Powered Vehicle 2005...

216

Session: Energy Conversion  

SciTech Connect

This session at the Geothermal Energy Program Review X: Geothermal Energy and the Utility Market consisted of five presentations: ''Hydrothermal Energy Conversion Technology'' by David Robertson and Raymond J. LaSala; ''Materials for Geothermal Production'' by Lawrence E. Kukacka; ''Supersaturated Turbine Expansions for Binary Geothermal Power Plants'' by Carl J. Bliem; ''Geothermal Waster Treatment Biotechnology: Progress and Advantages to the Utilities'' by Eugen T. Premuzic; and ''Geothermal Brine Chemistry Modeling Program'' by John H. Weare.

Robertson, David; LaSala, Raymond J.; Kukacka, Lawrence E.; Bliem, Carl J.; Premuzic, Eugene T.; Weare, John H.

1992-01-01T23:59:59.000Z

217

Ocean energy conversion systems annual research report  

SciTech Connect

Alternative power cycle concepts to the closed-cycle Rankine are evaluated and those that show potential for delivering power in a cost-effective and environmentally acceptable fashion are explored. Concepts are classified according to the ocean energy resource: thermal, waves, currents, and salinity gradient. Research projects have been funded and reported in each of these areas. The lift of seawater entrained in a vertical steam flow can provide potential energy for a conventional hydraulic turbine conversion system. Quantification of the process and assessment of potential costs must be completed to support concept evaluation. Exploratory development is being completed in thermoelectricity and 2-phase nozzles for other thermal concepts. Wave energy concepts are being evaluated by analysis and model testing with present emphasis on pneumatic turbines and wave focussing. Likewise, several conversion approaches to ocean current energy are being evaluated. The use of salinity resources requires further research in membranes or the development of membraneless processes. Using the thermal resource in a Claude cycle process as a power converter is promising, and a program of R and D and subsystem development has been initiated to provide confirmation of the preliminary conclusion.

Not Available

1981-03-01T23:59:59.000Z

218

High-Harmonic Fast-Wave Power Flow along Magnetic Field Lines in the Scrape-Off Layer of NSTX  

Science Journals Connector (OSTI)

A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast-wave heating and current drive.

R. J. Perkins; J. C. Hosea; G. J. Kramer; J.-W. Ahn; R. E. Bell; A. Diallo; S. Gerhardt; T. K. Gray; D. L. Green; E. F. Jaeger; M. A. Jaworski; B. P. LeBlanc; A. McLean; R. Maingi; C. K. Phillips; L. Roquemore; P. M. Ryan; S. Sabbagh; G. Taylor; J. R. Wilson

2012-07-27T23:59:59.000Z

219

High-Harmonic Fast-Wave Power Flow Along Magnetic Field Lines in the Scrape-Off Layer of NSTX  

SciTech Connect

A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast-wave heating and current drive.

Perkins, R. J. [Princeton Plasma Physics Laboratory (PPPL); Hosea, J. [Princeton Plasma Physics Laboratory (PPPL); Kramer, G. [Princeton Plasma Physics Laboratory (PPPL); Ahn, Joonwook [ORNL; Bell, R. E. [Princeton Plasma Physics Laboratory (PPPL); Diallo, A. [Princeton Plasma Physics Laboratory (PPPL); Gerhardt, S. [Princeton Plasma Physics Laboratory (PPPL); Gray, T. K. [Oak Ridge National Laboratory (ORNL); Green, David L [ORNL; Jaeger, Erwin Frederick [ORNL; Jaworski, M. A. [Princeton Plasma Physics Laboratory (PPPL); LeBlanc, B [Princeton Plasma Physics Laboratory (PPPL); McLean, Adam G [ORNL; Maingi, Rajesh [ORNL; Phillips, C. K. [Princeton Plasma Physics Laboratory (PPPL); Roquemore, L. [Princeton Plasma Physics Laboratory (PPPL); Ryan, Philip Michael [ORNL; Sabbagh, S. A. [Columbia University; Taylor, G. [Princeton Plasma Physics Laboratory (PPPL); Wilson, J. R. [Princeton Plasma Physics Laboratory (PPPL)

2012-01-01T23:59:59.000Z

220

Overview of Capabilities Conversion System Technology  

E-Print Network (OSTI)

cycles Heat exchanger design and optimization TES Material Integration & Optimization: Solar power plantOverview of Capabilities Conversion System Technology - Power System Demonstrations - Systems Conceptual Design/Trade Space Exploration - Simulation Modeling for Manufacturing - Hybrid Energy Systems

Lee, Dongwon

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


221

Risk-Mitigated Optimal Power Flow for Wind Powered Grids Emma Sjodin, Dennice F. Gayme and Ufuk Topcu  

E-Print Network (OSTI)

." High grid penetrations of solar or wind power pose a number of operational challenges and it is widely transmission capacity [10]. Until now, the power industry has dealt with potential failures using deterministic, Baltimore, MD, USA, 21218. dennice@jhu.edu U. Topcu is with Control and Dynamical Systems at the California

Low, Steven H.

222

Suction-recirculation device for stabilizing particle flows within a solar powered solid particle receiver  

DOE Patents (OSTI)

A suction-recirculation device for stabilizing the flow of a curtain of blackened heat absorption particles falling inside of a solar receiver with an open aperture. The curtain of particles absorbs the concentrated heat from a solar mirror array reflected up to the receiver on a solar power tower. External winds entering the receiver at an oblique angle can destabilize the particle curtain and eject particles. A fan and ductwork is located behind the back wall of the receiver and sucks air out through an array of small holes in the back wall. Any entrained particles are separated out by a conventional cyclone device. Then, the air is recirculated back to the top of the receiver by injecting the recycled air through an array of small holes in the receiver's ceiling and upper aperture front wall. Since internal air is recirculated, heat losses are minimized and high receiver efficiency is maintained. Suction-recirculation velocities in the range of 1-5 m/s are sufficient to stabilize the particle curtain against external wind speeds in excess of 10 m/s.

Kolb, Gregory J. (Albuquerque, NM)

2012-02-07T23:59:59.000Z

223

Optimal power flow under both normal and contingent operation conditions using the hybrid fuzzy particle swarm optimisation and Nelder-Mead algorithm (HFPSO-NM)  

Science Journals Connector (OSTI)

In this paper, we solve the optimal power flow problem using by the new hybrid fuzzy particle swarm optimisation and Nelder-Mead (NM) algorithm (HFPSO-NM). The goal of combining the NM simplex method and the particle swarm optimisation (PSO) method is ... Keywords: Fuzzy logic, HFPSO-NM, Nelder-Mead method, Optimal power flow, Particle swarm optimisation, Voltage stability

Mahmood Joorabian; Ehsan Afzalan

2014-01-01T23:59:59.000Z

224

The Impacts of Wind Power Integration on Sub-Daily Variation in River Flows Downstream of Hydroelectric Dams  

Science Journals Connector (OSTI)

The Impacts of Wind Power Integration on Sub-Daily Variation in River Flows Downstream of Hydroelectric Dams ... Due to their operational flexibility, hydroelectric dams are ideal candidates to compensate for the intermittency and unpredictability of wind energy production. ... In this paper, we examine the effects of increased (i.e., 5%, 15%, and 25%) wind market penetration on prices for electricity and reserves, and assess the potential for altered price dynamics to disrupt reservoir release schedules at a hydroelectric dam and cause more variable and unpredictable hourly flow patterns (measured in terms of the Richards-Baker Flashiness (RBF) index). ...

Jordan D. Kern; Dalia Patino-Echeverri; Gregory W. Characklis

2014-07-25T23:59:59.000Z

225

An approximate solution for the start-up flow of a power-law fluid in a tube  

Science Journals Connector (OSTI)

A theoretical solution of the unsteady-state momentum equation for the start-up flow of a power-law fluid in circular tubes is presented. The solution is obtained with an approximate technique which has previously proved to be useful in solving other transport problems involving nonlinear partial differential equations and explicit asymptotic expressions for the velocity profiles and flow-rates as functions of time are given. The accuracy of the method is checked by comparing the results with the existing exact analytical solution of Gromekha—Szymanski which applies for the Newtonian case and the results are believed to be good approximations for moderate and large values of time. An interesting aspect of the results is the effect of the flow behaviour index and the imposed pressure gradient on the start-up time.

J. Sestak; M.E. Charles

1968-01-01T23:59:59.000Z

226

Application of Planck's law to thermionic conversion  

SciTech Connect

A simple, highly accurate, mathematical model of heat-to-electricity conversion is developed from Planck's law for the distribution of the radiant exitance of heat at a selected temperature. An electrical power curve is calculated by integration of the heat law over a selected range of electromagnetic wavelength corresponding to electrical voltage. A novel wavelength-voltage conversion factor, developed from the known wavelength-electron volt conversion factor, establishes the wavelength ({lambda}) for the integration. The Planck law is integrated within the limits {lambda} to 2{lambda}. The integration provides the ideal electrical power that is available from heat at the emitter temperature. When multiplied by a simple ratio, the calculated ideal power closely matches published thermionic converter experimental data. The thermal power model of thermionic conversion is validated by experiments with thermionic emission of ordinary electron tubes. A theoretical basis for the heat law based model of thermionic conversion is found in linear oscillator theory.

Caldwell, F.

1998-07-01T23:59:59.000Z

227

A Game Strategy for Power Flow Control of Distributed Generators in Smart Grids  

Science Journals Connector (OSTI)

We consider the distributed power control problem of distributed generators(DGs) in smart grid. In order...

Jianliang Zhang; Donglian Qi; Guoyue Zhang…

2014-01-01T23:59:59.000Z

228

Wind power: executive summary on research on network wind power over the Pacific Northwest. Progress report, October 1979-September 1980  

SciTech Connect

This research in FY80 is composed of six primary tasks. These tasks include data collection and analysis, wind flow studies around an operational wind turbine generator (WTG), kite anemometer calibration, wind flow analysis and prediction, the Klickitat County small wind energy conversion system (SWECS) program, and network wind power analysis. The data collection and analysis task consists of four sections, three of which deal with wind flow site surveys and the fourth with collecting and analyzing wind data from existing data stations.

Baker, R.W.; Hewson, E.W.

1980-10-01T23:59:59.000Z

229

E-Print Network 3.0 - alkane conversion chemistry Sample Search...  

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

conversion chemistry Search Powered by Explorit Topic List Advanced Search Sample search results for: alkane conversion chemistry Page: << < 1 2 3 4 5 > >> 1 BERKELEY CATALYSIS...

230

Electric Power | Department of Energy  

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

Power Power Electric Power From incandescent bulbs to fluorescents to LEDs, learn more about the long history of the light bulb. From incandescent bulbs to fluorescents to LEDs, learn more about the long history of the light bulb. Electricity -- the flow of electrical power -- is a secondary energy source, generated by the conversion of primary sources of energy, like fossil, nuclear, wind or solar. Keeping the power flowing to American homes and businesses is a critical necessity for everyday life and economic vitality. The Energy Department works to keep the grid secure from cyber and physical attacks; partners with states and other stakeholders to plan more resilient infrastructure that can better withstand extreme weather events; and supports efforts to

231

E-Print Network 3.0 - acoustic-to-structure power flow Sample...  

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

Information Sciences 37 Chapter 1 x Introduction 7 1.12 For low-speed (laminar) flow in a tube of radius ro, the velocity u takes the form Summary: Chapter 1 x Introduction 7 1.12...

232

Flow and heat transfer in porous micro heat sink for thermal management of high power LEDs  

Science Journals Connector (OSTI)

A novel porous micro heat sink system is presented for thermal management of high power LEDs, which has high heat transport capability. The operational principle and heat transfer characteristics of porous micro heat sink are analyzed. Numerical model ... Keywords: Heat dissipation, High heat flux, High power LEDs, Porous media, Porous micro heat sink

Z. M. Wan; J. Liu; K. L. Su; X. H. Hu; S. S. M

2011-05-01T23:59:59.000Z

233

A Set-Theoretic Framework to Assess the Impact of Variable Generation on the Power Flow  

E-Print Network (OSTI)

´inguez-Garc´ia, Member, IEEE Abstract--The increased penetration of renewable resources, such as wind and solar penetration of renewable resources of electricity, such as wind and solar, into existing power systems. Since to assess whether power system static state vari- ables, i.e., bus voltage magnitudes and angles, remain

Liberzon, Daniel

234

ENVIRONMENTAL ASSESSMENT OCEAN THERMAL ENERGY CONVERSION (OTEC) PILOT PLANTS  

E-Print Network (OSTI)

screens for ocean thermal energy conversion power plants.cold deep-ocean waters to produce electric power via eitherOffice of Solar Power Applications. Division of Ocean Energy

Sullivan, S.M.

2014-01-01T23:59:59.000Z

235

OCEAN THERMAL ENERGY CONVERSION (OTEC) PROGRAMMATIC ENVIRONMENTAL ANALYSIS  

E-Print Network (OSTI)

of an open cycle ocean thermal difference power plant. M.S.screens for ocean thermal energy conversion power plants.1958. Ocean cooling water system for 800 MW power station.

Sands, M. D.

2011-01-01T23:59:59.000Z

236

ESS 2012 Peer Review - Low Cost, High Performance and Long Life Flow Battery Electrodes - Tom Stepien, Primus Power  

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

With ARPA-E we optimized With ARPA-E we optimized * Adhesion * Current density * Duration * Catalytic coatings * Voltaic performance Goals * Cost-effectiveness * High-efficiency * Uniformity EnergyPod Low Cost, High Performance and Long Life Flow Battery Electrodes TM A Breakthrough In Distributed, Grid Scale Energy Storage ARPA-E has enabled Primus Power to create an innovative and technically advanced electrode Electrode Zinc Plating This, combined with our other advances has enabled us to create a unique flow battery system with ...  Low cost electrodes  Long life  High efficiency  Flexibility For...  Ubiquitous  Dispatchable  Cost effective ... grid-scale electrical energy storage to: * Accelerate renewable

237

Fast-wave power flow along SOL field lines in NSTX and the associated power deposition profile across the SOL in front of the antenna  

Science Journals Connector (OSTI)

Fast-wave heating and current drive efficiencies can be reduced by a number of processes in the vicinity of the antenna and in the scrape-off layer (SOL). On NSTX from around 25% to more than 60% of the high-harmonic fast-wave power can be lost to the SOL regions, and a large part of this lost power flows along SOL magnetic field lines and is deposited in bright spirals on the divertor floor and ceiling. We show that field-line mapping matches the location of heat deposition on the lower divertor, albeit with a portion of the heat outside of the predictions. The field-line mapping can then be used to partially reconstruct the profile of lost fast-wave power at the midplane in front of the antenna, and the losses peak close to the last closed flux surface as well as the antenna. This profile suggests a radial standing-wave pattern formed by fast-wave propagation in the SOL, and this hypothesis will be tested on NSTX-U. RF codes must reproduce these results so that such codes can be used to understand this edge loss and to minimize RF heat deposition and erosion in the divertor region on ITER.

R.J. Perkins; J.-W. Ahn; R.E. Bell; A. Diallo; S. Gerhardt; T.K. Gray; D.L. Green; E.F. Jaeger; J.C. Hosea; M.A. Jaworski; B.P. LeBlanc; G.J. Kramer; A. McLean; R. Maingi; C.K. Phillips; M. Podestà; L. Roquemore; P.M. Ryan; S. Sabbagh; F. Scotti; G. Taylor; J.R. Wilson

2013-01-01T23:59:59.000Z

238

Fast-wave Power Flow Along SOL Field Lines In NSTX nd The Associated Power Deposition Profile Across The SOL In Front Of The Antenna  

SciTech Connect

Fast-wave heating and current drive efficiencies can be reduced by a number of processes in the vicinity of the antenna and in the scrape off layer (SOL). On NSTX from around 25% to more than 60% of the high-harmonic fast-wave power can be lost to the SOL regions, and a large part of this lost power flows along SOL magnetic field lines and is deposited in bright spirals on the divertor floor and ceiling. We show that field-line mapping matches the location of heat deposition on the lower divertor, albeit with a portion of the heat outside of the predictions. The field-line mapping can then be used to partially reconstruct the profile of lost fast-wave power at the midplane in front of the antenna, and the losses peak close to the last closed flux surface (LCFS) as well as the antenna. This profile suggests a radial standing-wave pattern formed by fast-wave propagation in the SOL, and this hypothesis will be tested on NSTX-U. Advanced RF codes must reproduce these results so that such codes can be used to understand this edge loss and to minimize RF heat deposition and erosion in the divertor region on ITER.

Perkins, Roy

2013-06-21T23:59:59.000Z

239

Design and Performance of Linear Biomechanical Energy Conversion Devices Penglin Niu, Student Member  

E-Print Network (OSTI)

Design and Performance of Linear Biomechanical Energy Conversion Devices Penglin Niu, Student, energy conversion, synchronous rectifier, voltage tripler, energy harvesting, human power. I investigated motions as energy sources for biomechanical energy conversion [1-7]. Until recently, most efforts

Chapman, Patrick

240

Conversion of Questionnaire Data  

SciTech Connect

During the survey, respondents are asked to provide qualitative answers (well, adequate, needs improvement) on how well material control and accountability (MC&A) functions are being performed. These responses can be used to develop failure probabilities for basic events performed during routine operation of the MC&A systems. The failure frequencies for individual events may be used to estimate total system effectiveness using a fault tree in a probabilistic risk analysis (PRA). Numeric risk values are required for the PRA fault tree calculations that are performed to evaluate system effectiveness. So, the performance ratings in the questionnaire must be converted to relative risk values for all of the basic MC&A tasks performed in the facility. If a specific material protection, control, and accountability (MPC&A) task is being performed at the 'perfect' level, the task is considered to have a near zero risk of failure. If the task is performed at a less than perfect level, the deficiency in performance represents some risk of failure for the event. As the degree of deficiency in performance increases, the risk of failure increases. If a task that should be performed is not being performed, that task is in a state of failure. The failure probabilities of all basic events contribute to the total system risk. Conversion of questionnaire MPC&A system performance data to numeric values is a separate function from the process of completing the questionnaire. When specific questions in the questionnaire are answered, the focus is on correctly assessing and reporting, in an adjectival manner, the actual performance of the related MC&A function. Prior to conversion, consideration should not be given to the numeric value that will be assigned during the conversion process. In the conversion process, adjectival responses to questions on system performance are quantified based on a log normal scale typically used in human error analysis (see A.D. Swain and H.E. Guttmann, 'Handbook of Human Reliability Analysis with Emphasis on Nuclear Power Plant Applications,' NUREG/CR-1278). This conversion produces the basic event risk of failure values required for the fault tree calculations. The fault tree is a deductive logic structure that corresponds to the operational nuclear MC&A system at a nuclear facility. The conventional Delphi process is a time-honored approach commonly used in the risk assessment field to extract numerical values for the failure rates of actions or activities when statistically significant data is absent.

Powell, Danny H [ORNL] [ORNL; Elwood Jr, Robert H [ORNL] [ORNL

2011-01-01T23:59:59.000Z

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


241

Optimal power flow considering fault current level constraints and fault current limiters  

Science Journals Connector (OSTI)

Abstract The aim of this paper is to present a novel method to dispatch the active generation power properly in the power system while incorporating fault current levels as constraints for the optimization problem. Due to the limited capacity of protective devices such as circuit breakers, allocating active power without considering fault current levels can probably lead to fault currents exceeding the rating of these devices. Hence restricting the fault current levels to an allowable amount while minimizing a specified objective function seems to be necessary. In a number of cases even the appropriate allocation of active power is not able to reduce the fault current levels to the permitted amount therefore using fault current limiters (FCL) is unavoidable. In this paper also a planning scheme is presented for the location and sizing of fault current limiters and the effect of fault current limiters on the objective functions is investigated.

Amirhossein Khazali; Mohsen Kalantar

2014-01-01T23:59:59.000Z

242

Affecting the Gross Cooling Power of a Pulse Tube Cryocooler with Mass Flow Control  

Science Journals Connector (OSTI)

To increase the cooling capacity of a pulse tube cryocooler the ... For a given pulse tube volume the gross cooling power is limited. Since the cooling effect originates from the phase shift angle ... we present ...

A. Waldauf; T. Schmauder; M. Thürk; P. Seidel

2003-01-01T23:59:59.000Z

243

CO2 Conversion to CH4  

Science Journals Connector (OSTI)

A power-to-gas technology that converts renewable energy to methane...16]. Conversion of renewable energy, that is, solar or wind, into fuel is an easy way to store solar energy, characterized by low energy densi...

V. Barbarossa; C. Bassano; P. Deiana; G. Vanga

2013-01-01T23:59:59.000Z

244

Utilization of a fuel cell power plant for the capture and conversion of gob well gas. Final report, June--December, 1995  

SciTech Connect

A preliminary study has been made to determine if a 200 kW fuel cell power plant operating on variable quality coalbed methane can be placed and successfully operated at the Jim Walter Resources No. 4 mine located in Tuscaloosa County, Alabama. The purpose of the demonstration is to investigate the effects of variable quality (50 to 98% methane) gob gas on the output and efficiency of the power plant. To date, very little detail has been provided concerning the operation of fuel cells in this environment. The fuel cell power plant will be located adjacent to the No. 4 mine thermal drying facility rated at 152 M British thermal units per hour. The dryer burns fuel at a rate of 75,000 cubic feet per day of methane and 132 tons per day of powdered coal. The fuel cell power plant will provide 700,000 British thermal units per hour of waste heat that can be utilized directly in the dryer, offsetting coal utilization by approximately 0.66 tons per day and providing an avoided cost of approximately $20 per day. The 200 kilowatt electrical power output of the unit will provide a utility cost reduction of approximately $3,296 each month. The demonstration will be completely instrumented and monitored in terms of gas input and quality, electrical power output, and British thermal unit output. Additionally, real-time power pricing schedules will be applied to optimize cost savings. 28 refs., 35 figs., 13 tabs.

Przybylic, A.R.; Haynes, C.D.; Haskew, T.A.; Boyer, C.M. II; Lasseter, E.L.

1995-12-01T23:59:59.000Z

245

Energy conversion system  

DOE Patents (OSTI)

The energy conversion system includes a photo-voltaic array for receiving solar radiation and converting such radiation to electrical energy. The photo-voltaic array is mounted on a stretched membrane that is held by a frame. Tracking means for orienting the photo-voltaic array in predetermined positions that provide optimal exposure to solar radiation cooperate with the frame. An enclosure formed of a radiation transmissible material includes an inside containment space that accommodates the photo-voltaic array on the stretched membrane, the frame and the tracking means, and forms a protective shield for all such components. The enclosure is preferably formed of a flexible inflatable material and maintains its preferred form, such as a dome, under the influence of a low air pressure furnished to the dome. Under this arrangement the energy conversion system is streamlined for minimizing wind resistance, sufficiently weatherproof for providing protection against weather hazards such as hail, capable of using diffused light, lightweight for low-cost construction, and operational with a minimal power draw.

Murphy, Lawrence M. (Lakewood, CO)

1987-01-01T23:59:59.000Z

246

Energy conversion system  

DOE Patents (OSTI)

The energy conversion system includes a photo-voltaic array for receiving solar radiation and converting such radiation to electrical energy. The photo-voltaic array is mounted on a stretched membrane that is held by a frame. Tracking means for orienting the photo-voltaic array in predetermined positions that provide optimal exposure to solar radiation cooperate with the frame. An enclosure formed of a radiation transmissible material includes an inside containment space that accommodates the photo-voltaic array on the stretched membrane, the frame and the tracking means, and forms a protective shield for all such components. The enclosure is preferably formed of a flexible inflatable material and maintains its preferred form, such as a dome, under the influence of a low air pressure furnished to the dome. Under this arrangement the energy conversion system is streamlined for minimizing wind resistance, sufficiently weathproof for providing protection against weather hazards such as hail, capable of using diffused light, lightweight for low-cost construction and operational with a minimal power draw.

Murphy, L.M.

1985-09-16T23:59:59.000Z

247

Enhanced power conversion efficiency of dye-sensitized solar cells with multifunctional photoanodes based on a three-dimensional TiO2 nanohelix array  

Science Journals Connector (OSTI)

Abstract Developments of metal oxide nanostructures for simultaneous improvements in light harvesting and charge collection can lead to a significant technical progress in various applications such as photoelectrodes for photoelectrochemical cells and various types of solar cells. Here we present an array of three-dimensional titanium dioxide (TiO2) nanohelixes infiltrated with TiO2 nanoparticles as a multifunctional photoanode for dye sensitized solar cells (DSSCs). The unique geometry and the near-single crystallinity of the vertically aligned TiO2 nanohelix array results simultaneously in strong light scattering and enhanced carrier transport and collection, while maintaining a comparable surface area accessible for dye molecules by the infiltrated TiO2 nanoparticles. Consequently, despite a ~40% reduction in dye loading, the overall photon conversion efficiency of the DSSC with the nanoparticle-infiltrated nanohelix-array photoanode is enhanced by 6.2% in comparison with the DSSC with the conventional nanoparticle photoanode.

Seung Hee Lee; Jeong Kwon; Dong Yeong Kim; Kyung Song; Sang Ho Oh; Jaehee Cho; E. Fred Schubert; Jong Hyeok Park; Jong Kyu Kim

2015-01-01T23:59:59.000Z

248

Distributed control of reactive power flow in a radial distribution circuit with high photovoltaic penetration  

SciTech Connect

We show how distributed control of reactive power can serve to regulate voltage and minimize resistive losses in a distribution circuit that includes a significant level of photovoltaic (PV) generation. To demonstrate the technique, we consider a radial distribution circuit with a single branch consisting of sequentially-arranged residential-scale loads that consume both real and reactive power. In parallel, some loads also have PV generation capability. We postulate that the inverters associated with each PV system are also capable of limited reactive power generation or consumption, and we seek to find the optimal dispatch of each inverter's reactive power to both maintain the voltage within an acceptable range and minimize the resistive losses over the entire circuit. We assume the complex impedance of the distribution circuit links and the instantaneous load and PV generation at each load are known. We compare the results of the optimal dispatch with a suboptimal local scheme that does not require any communication. On our model distribution circuit, we illustrate the feasibility of high levels of PV penetration and a significant (20% or higher) reduction in losses.

Chertkov, Michael [Los Alamos National Laboratory; Turitsyn, Konstantin [Los Alamos National Laboratory; Backhaus, Scott [Los Alamos National Laboratory; Sule, Petr [NEW MEXICO CONSORTIUM

2009-01-01T23:59:59.000Z

249

A Zonotope-Based Method for Capturing the Effect of Variable Generation on the Power Flow  

E-Print Network (OSTI)

such as wind and solar into existing systems. Using this method, we can determine whether the system state- machine transmission system. I. INTRODUCTION The integration of renewable resources such as wind and solar of a power system; this uncertainty arises from the increasing penetration of renewable resources

Liberzon, Daniel

250

Liquid Metal MHD Energy Conversion in Fusion Reactors  

Science Journals Connector (OSTI)

Innovative Concepts for Power Conversion / Proceedings of the Seveth Topical Meeting on the Technology of Fusion Energy (Reno, Nevada, June 15–19, 1986)

L. Blumenau; H. Branover; A. El-Boher; E Spero; S. Sukoriansky; G. Talmage; E. Greenspan

251

Output-power fluctuations of flowing-gas CO/sub 2/ lasers with unstable resonators  

SciTech Connect

An experimental study was made of the influence of different factors on the stability of the output intensity of a flowing-gas CO/sub 2/ laser with an unstable resonator. The measured amplitude--frequency characteristics of the intensity fluctuation spectrum had resonance peaks at multiples of the frequency corresponding to the transit time of the gas to the optic axis of the resonator. A rise in the efficiency of the laser system was found to be accompanied by an increase in the amplitude of the fluctuations of the radiation intensity.

Artamonov, A.V.; Konev, V.A.; Likhanskii, V.V.; Napartovich, A.P.

1984-06-01T23:59:59.000Z

252

Electrochemical characterization of a supercapacitor flow cell for power production from salinity gradients  

Science Journals Connector (OSTI)

Salinity gradients could be a great source of energy in the future. Capacitive energy extraction based on Donnan Potential (CDP) is a new technique to directly convert this energy into electricity. CDP uses a supercapacitor-like device combining ion exchange membranes and capacitive materials to adsorb and desorb ions with the Donnan Potential of the membranes as only driving force. The resulting current can be extracted through an external load. In this study, traditional electrochemical techniques: galvanostatic charge–discharge and cyclic voltammetry were used to investigate intrinsic properties of this open system. This study demonstrates the feasibility to characterize the capacitive behavior of the cell in low concentration (0.5 M). Presence of membranes, as well as the possibility of having the electrolyte flowing through the cell was investigated. In the studied cell, the presence of membranes showed a limitation by the anion exchange membrane at low current densities but no effect at high current densities. The flow rate did not influence the capacitance of the system either.

Bruno B. Sales; Fei Liu; Olivier Schaetzle; Cees J.N. Buisman; Hubertus V.M. Hamelers

2012-01-01T23:59:59.000Z

253

EIS-0036: Coal Conversion Program, New England Power Company, Brayton Point Generating Station Plants 1, 2 and 3, Sommerset, Bristol County, Massachusetts  

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

The Economic Regulatory Administration developed this EIS to evaluate the site-specific environmental impacts of issuing a Notice of Effectiveness to New England Power Company's Brayton Point Generating Station, Units 1, 2 and 3 to prohibit burning of gas or oil as the primary source of fuel.

254

Improving PbS Quantum Dot Solar Cell Power Conversion Efficiency to an NREL-Certified 4.4% (Fact Sheet)  

SciTech Connect

Transition metal oxide improves overall efficiency and maintains performance with inexpensive metals. A research team at the National Renewable Energy Laboratory (NREL) has demonstrated that inserting a transition metal oxide (TMO) between the lead sulfide (PbS) quantum dot (QD) layer and the metal electrode eliminates the Schottky barrier that impedes efficient hole extraction and thereby improves the overall conversion efficiency. This allows for inexpensive metals such as Al to be employed without loss of performance. n-type TMOs consisting of molybdenum oxide (MoO{sub x}) and vanadium oxide (V{sub 2}O{sub x}) were used as an efficient hole extraction layer (HEL) in heterojunction ZnO/PbS QD solar cells. A 4.4% NREL-certified device was reported based on the MoO{sub x} HEL with Al as the back contact material, representing a more than 65% efficiency improvement compared with the case of Au contacting the PbS QD layer directly. The team finds the acting mechanism of the HEL to be a dipole formed at the MoO{sub x} and PbS interface, which enhances band bending to allow efficient hole extraction from the valence band of the PbS layer by MoO{sub x}. The carrier transport to the metal anode is likely enhanced through shallow gap states in the MoO{sub x} layer.

Not Available

2012-01-01T23:59:59.000Z

255

System and method for measuring particles in a sample stream of a flow cytometer using a low power laser source  

DOE Patents (OSTI)

A system and method for analyzing a particle in a sample stream of a flow cytometer or the like. The system has a light source, such as a laser pointer module, for generating a low powered light beam and a fluidics apparatus which is configured to transport particles in the sample stream at substantially low velocity through the light beam for interrogation. Detectors, such as photomultiplier tubes, are configured to detect optical signals generated in response to the light beam impinging the particles. Signal conditioning circuitry is connected to each of the detectors to condition each detector output into electronic signals for processing and is designed to have a limited frequency response to filter high frequency noise from the detector output signals.

Graves, Steven W; Habbersett, Robert C

2013-10-22T23:59:59.000Z

256

System and method for measuring particles in a sample stream of a flow cytometer using low-power laser source  

DOE Patents (OSTI)

A system and method for analyzing a particle in a sample stream of a flow cytometer or the like. The system has a light source, such as a laser pointer module, for generating a low powered light beam and a fluidics apparatus which is configured to transport particles in the sample stream at substantially low velocity through the light beam for interrogation. Detectors, such as photomultiplier tubes, are configured to detect optical signals generated in response to the light beam impinging the particles. Signal conditioning circuitry is connected to each of the detectors to condition each detector output into electronic signals for processing and is designed to have a limited frequency response to filter high frequency noise from the detector output signals.

Graves, Steven W.; Habbersett, Robert C.

2014-07-01T23:59:59.000Z

257

In-line continuous sizing of biomass particles in gas-solid two-phase flow at a biomass-fired power plant  

Science Journals Connector (OSTI)

Gas-solid two-phase flows are widely seen in many industrial processes. A good exampleis the pneumatically conveyed pulverised fuel flow in the power generation industry. As a significant renewable fuel source biomass has been widely adopted in electrical power generation. The particle size distribution of pneumatically conveyed biomass correlates closely with combustion efficiency and pollutant emissions and should therefore be monitored on anin-line continuous basis. In this paper an integrated instrumentation system using both a piezoelectric sensorand anelectrostatic sensor arrayis proposed to measure the size distribution and flow velocity of biomass particles. A prototype system was tested on a 250mm bore pipe at a biomass-fired power plantand its performance has been evaluated under industrial conditions.

2014-01-01T23:59:59.000Z

258

BETO Conversion Program  

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

Breakout Session 2A—Conversion Technologies II: Bio-Oils, Sugar Intermediates, Precursors, Distributed Models, and Refinery Co-Processing BETO Conversion Program Bryna Berendzen, Technology Manager, Bioenergy Technologies Office, U.S. Department of Energy

259

Photoelectrochemical solar energy conversion  

Science Journals Connector (OSTI)

In the present paper the progress in the field of solar energy conversion for the production of electricity and storable ... critically analyzed in view of their stability and conversion efficiency. A number of factors

Rüdiger Memming

1988-01-01T23:59:59.000Z

260

Solar Thermoelectric Energy Conversion  

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

SOLID-STATE SOLAR-THERMAL ENERGY CONVERSION CENTER NanoEngineering Group Solar Thermoelectric Energy Conversion Gang Chen, 1 Daniel Kraemer, 1 Bed Poudel, 2 Hsien-Ping Feng, 1 J....

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


261

La Spezia power plant: Conversion of units 1 and 2 to combined cycle with modification of steam turbines from cross compound to tandem compound  

SciTech Connect

Units 1 and 2 of ENEL's La Spezia power plant, rated 310 and 325 MW respectively, are going to be converted to combined cycle. This project will be accomplished by integrating components such as gas turbines and HRSGs with some of the existing components, particularly the steam turbines, which are of the cross compound type. Since the total power of each converted unit has to be kept at 335 MW because of permitting limitations, the power delivered by the steam turbine will be limited to about 115 MW. For this reason a study was carried out to verify the possibility of having only one shaft and modifying the turbine to tandem compound. As additional investments are required for this modification, a balance was performed that also took into account the incremental heat rate and, on the other hand, the benefits from decreased maintenance and increased availability and reliability calculated for the expected useful life. The result of this balance was in favor of the modification, and a decision was taken accordingly. The turbine modification will involve replacing the whole HP section with a new combined HP-IP section while retaining the corresponding LP rotor and cylinder and making the needed changes in the valve arrangements and piping. Work on the site began in the spring of 1997 by dismantling the existing boiler so as to have the space needed to install the GTs and HRSGs. The first synchronization of the converted unit 1 is scheduled for November 1999

Magneschi, P.; Gabiccini, S.; Bracaloni, N.; Fiaschi, C.

1998-07-01T23:59:59.000Z

262

Nonlinear power flow feedback control for improved stability and performance of airfoil sections  

DOE Patents (OSTI)

A computer-implemented method of determining the pitch stability of an airfoil system, comprising using a computer to numerically integrate a differential equation of motion that includes terms describing PID controller action. In one model, the differential equation characterizes the time-dependent response of the airfoil's pitch angle, .alpha.. The computer model calculates limit-cycles of the model, which represent the stability boundaries of the airfoil system. Once the stability boundary is known, feedback control can be implemented, by using, for example, a PID controller to control a feedback actuator. The method allows the PID controller gain constants, K.sub.I, K.sub.p, and K.sub.d, to be optimized. This permits operation closer to the stability boundaries, while preventing the physical apparatus from unintentionally crossing the stability boundaries. Operating closer to the stability boundaries permits greater power efficiencies to be extracted from the airfoil system.

Wilson, David G.; Robinett, III, Rush D.

2013-09-03T23:59:59.000Z

263

Adaptive three-phase power-flow solutions for smart grids with plug-in hybrid electric vehicles  

Science Journals Connector (OSTI)

Abstract This paper introduces an adaptive three-phase power flow method for smart grids with plug-in hybrid electric vehicles (PHEVs). The proposed method is developed based on the loop frame of reference. The operations of smart grids are inherently unbalanced because of the incomplete three-phase feeder arrangements, nonsymmetrical conductor spacing of three-phase underground cables and overhead lines, unbalanced loads, and a variety of distributed energy resources (DERs). Therefore, the proposed method was developed based on the actual phase (a–b–c) frame, rather than the sequence-component frame. To adapt the network topologies of smart grids, two solution strategies are used, one for radial smart grids and the other for non-radial smart grids. To demonstrate the validity and capability of the proposed algorithm, four IEEE feeder systems and an actual Taiwan Power Company (Taipower) distribution system are used as benchmarks for comparison purposes. The test results show that the proposed method is accurate, efficient, and adaptable, and it therefore has good potential for smart grid energy management system (EMS) applications.

Nien-Che Yang; Wei-Chih Tseng

2015-01-01T23:59:59.000Z

264

Plasmonic conversion of solar energy  

E-Print Network (OSTI)

a novel method of solar energy conversion that can lead tofundamentals of plasmonic energy conversion are reviewed in3. Plasmonic energy conversion fundamentals Surface plasmons

Clavero, Cesar

2014-01-01T23:59:59.000Z

265

Energy Conversion Efficiency of Nanofluidic Batteries: Hydrodynamic Slip and Access Resistance  

E-Print Network (OSTI)

Energy Conversion Efficiency of Nanofluidic Batteries: Hydrodynamic Slip and Access Resistance Yu and concentration polarization) on the energy conversion efficiency of pressure-driven electrolyte flow through battery system is its low energy conversion efficiency. Up to now, the energy conversion efficiencies have

Chang, Hsueh-Chia

266

DRAFT. ENVIRONMENTAL ASSESSMENT OCEAN THERMAL ENERGY CONVERSION (OTEC) PILOT PLANTS  

E-Print Network (OSTI)

screens for ocean thermal energy conversion power plants.cold deep-ocean waters to produce electric power via eitherpower from the temperature differential between warm surface and cold deep-ocean

Sullivan, S.M.

2014-01-01T23:59:59.000Z

267

Thermoelectric Conversion of Wate Heat to Electricity in an IC...  

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

Wate Heat to Electricity in an IC Engine Powered Vehicle Thermoelectric Conversion of Wate Heat to Electricity in an IC Engine Powered Vehicle Presentation given at the 16th...

268

Transient thermal analysis of a space reactor power system  

E-Print Network (OSTI)

Thermoelectric Power Conversion Module Heat Pipe Radiator Module . Auxiliary Modules . Flow of Calculation . Transient Test Cases Studied Summary . 10 10 CHAPTER II. ENERGY EQUATION FINITE DIFFERENCING . . 12 Energy Equation for a Solid Finite..., but this stud~ uses a generic liquid metal cooled fast reactor concept as the model to test the code. The space power svstem to be modeled consists of a liquid lithium cooled fast reactor, primarv and secondary loops svith a sell-induced thermoelectric...

Gaeta, Michael J.

1988-01-01T23:59:59.000Z

269

Iterated multidimensional wave conversion  

SciTech Connect

Mode conversion can occur repeatedly in a two-dimensional cavity (e.g., the poloidal cross section of an axisymmetric tokamak). We report on two novel concepts that allow for a complete and global visualization of the ray evolution under iterated conversions. First, iterated conversion is discussed in terms of ray-induced maps from the two-dimensional conversion surface to itself (which can be visualized in terms of three-dimensional rooms). Second, the two-dimensional conversion surface is shown to possess a symplectic structure derived from Dirac constraints associated with the two dispersion surfaces of the interacting waves.

Brizard, A. J. [Dept. Physics, Saint Michael's College, Colchester, VT 05439 (United States); Tracy, E. R.; Johnston, D. [Dept. Physics, College of William and Mary, Williamsburg, VA 23187-8795 (United States); Kaufman, A. N. [LBNL and Physics Dept., UC Berkeley, Berkeley, CA 94720 (United States); Richardson, A. S. [T-5, LANL, Los Alamos, NM 87545 (United States); Zobin, N. [Dept. Mathematics, College of William and Mary, Williamsburg, VA 23187-8795 (United States)

2011-12-23T23:59:59.000Z

270

Multi-Megawatt Power System Trade Study  

SciTech Connect

A concept study was undertaken to evaluate potential multi-megawatt power sources for nuclear electric propulsion. The nominal electric power requirement was set at 15 MWe with an assumed mission profile of 120 days at full power, 60 days in hot standby, and another 120 days of full power, repeated several times for 7 years of service. Two configurations examined were (1) a gas-cooled reactor based on the NERVA Derivative design, operating a closed cycle Brayton power conversion system; and (2) a molten metal-cooled reactor based on SP-100 technology, driving a boiling potassium Rankine power conversion system. This study considered the relative merits of these two systems, seeking to optimize the specific mass. Conclusions were that either concept appeared capable of approaching the specific mass goal of 3-5 kg/kWe estimated to be needed for this class of mission, though neither could be realized without substantial development in reactor fuels technology, thermal radiator mass efficiency, and power conversion and distribution electronics systems capable of operating at high temperatures. The gas-Brayton systems showed an apparent specific mass advantage (3.53 vs 6.43 kg/kWe for the baseline cases) under the set of assumptions used, but reconciling differences in conservatism in the design algorithms used would make results much more comparable. Brayton systems eliminate the need to deal with two-phase working fluid flows in the microgravity environment of space.

Longhurst, Glen Reed; Schnitzler, Bruce Gordon; Parks, Benjamin Travis

2002-02-01T23:59:59.000Z

271

PowerPoint Presentation  

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

Awards Lab-Level Objectives distinguish PNNL Chemical Imaging of Dynamic Systems Chemical Conversions for Sustainable Energy Efficient and Secure Power Grid Disruption of Illicit...

272

Processing and Conversion  

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

The strategic goal of Conversion Research and Development (R&D) is to develop technologies for converting feedstocks into commercially viable liquid transportation fuels, as well as bioproducts...

273

Algae Harvest Energy Conversion  

Science Journals Connector (OSTI)

Resolution of many workshops on algae harvest energy conversion is that low productivity, high capital intensity ... and maintenance, respiration, and photoinhibition are few factors militating against viability ...

Yung-Tse Hung Ph.D.; P.E.; DEE; O. Sarafadeen Amuda Ph.D.…

2010-01-01T23:59:59.000Z

274

QUANTUM CONVERSION IN PHOTOSYNTHESIS  

E-Print Network (OSTI)

QUANTUM CONVERSION IN PHOTOSYNTHESIS Melvin Calvin Januaryas it occurs in modern photosynthesis can only take place inof the problem or photosynthesis, or any specific aspect of

Calvin, Melvin

2008-01-01T23:59:59.000Z

275

Tidal Conversion by Supercritical Topography NEIL J. BALMFORTH  

E-Print Network (OSTI)

are presented of the rate of energy conversion of the barotropic tide into internal gravity waves above and are scattered both up and down). A complicated pattern is found for the dependence of energy conversion on e of internal waves as the barotropic tide flows over topography on the ocean floor has lately received wide

Balmforth, Neil

276

Photovoltaic Energy Conversion  

E-Print Network (OSTI)

Photovoltaic Energy Conversion Frank Zimmermann #12;Solar Electricity Generation Consumes no fuel Make solar cells more efficient Theoretical energy conversion efficiency limit of single junction-bandgap photons are not absorbed: Carrier relaxation to band edges: Photon energy exceeding bandgap is lost

Glashausser, Charles

277

Research Program - Center for Solar and Thermal Energy Conversion  

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

thrust of CSTEC focuses on fundamental transport processes that govern solid state energy conversion, i.e., how the charge and energy flow through the atomic lattice or an...

278

The Energy Transformation Limit Theorem for Gas Flow Systems  

E-Print Network (OSTI)

The limit energy theorem which determines the possibility of transformation the energy flow in power systems in the absence of technical work is investigated and proved for such systems as gas lasers and plasmatrons, chemical gas reactors, vortex tubes, gas-acoustic and other systems, as well as a system of close stars. In the case of the same name ideal gas in the system the maximum ratio of energy conversion effectiveness is linked to the Carnot theorem, which in its turn is connected with the Nernst theorem. However, numerical analyses show that the class of flow energy systems is non-carnot one. The ratio of energy conversion effectiveness depends on the properties of the working medium; a conventional cycle in open-circuit is essentially irreversible. The proved theorem gives a more strongly worded II law of thermodynamics for the selected class of flow energy systems. Implications for astrophysical thermodynamic systems and the theory of a strong shock wave are discussed.

Volov, V T

2011-01-01T23:59:59.000Z

279

The effect of oxygen flow rate and radio frequency plasma power on cubic ZnMgO ultraviolet sensors grown by plasma-enhanced molecular beam epitaxy  

SciTech Connect

Cubic Zn{sub 1-x}Mg{sub x}O thin films were produced by Plasma-Enhanced Molecular Beam Epitaxy. Oxygen flow rate and applied Radio-Frequency (RF) plasma power were varied to investigate the impact on film growth and optoelectronic device performance. Solar-blind and visible-blind detectors were fabricated with metal-semiconductor-metal interdigitated Ni/Mg/Au contacts and responsivity is compared under different growth conditions. Increasing oxygen flow rate and RF plasma power increased Zn incorporation in the film, which leads to phase segregation at relatively high Zn/Mg ratio. Responsivity as high as 61 A/W was measured in phase-segregated ZnMgO visible-blind detectors.

Casey Boutwell, R.; Wei Ming; Schoenfeld, Winston V. [CREOL, College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816-2700 (United States)

2013-07-15T23:59:59.000Z

280

ITP Industrial Distributed Energy: Microturbine Power Conversion...  

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

after January 1, 1996, are generally available free via the U.S. Department of Energy (DOE) Information Bridge. Web site http:www.osti.govbridge Not available...

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


281

Automotive Waste Heat Conversion to Power Program  

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

2010 DOE Vehicle Technologies and Hydrogen Programs Annual Merit Review and Peer Evaluation Meeting, June 7-11, 2010 -- Washington D.C.

282

Sandia National Laboratories: Brayton power conversion systems  

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

Doppler Velocimeter EC Top Publications A Comparison of Platform Options for Deep-water Floating Offshore Vertical Axis Wind Turbines: An Initial Study Nonlinear Time-Domain...

283

North American Power Symposium NAPS, Cleveland, Ohio, October 1998, pp. 294 299. Fundamental Frequency Model of Uni ed Power Flow Controller  

E-Print Network (OSTI)

. The two main objectives of FACTS are to increase the transmission ca- pacity of ac lines and control power ow over designated transmission routes. The improvements in the eld of power electronics have had Capacitor TCSC, as it permits a change in the impedance of the transmission line through a voltage source

Cañizares, Claudio A.

284

Sustainable systems for the storage and conversion of energy are dependent on interconnected  

E-Print Network (OSTI)

SEMTE abstract Sustainable systems for the storage and conversion of energy are dependent performance buildings, renewable energy conversion, and energy storage can be streamlined by identifying energy systems for harvesting low availability thermal energy and for providing integrated power, cooling

Reisslein, Martin

285

Issues related to wind energy conversion systems  

Science Journals Connector (OSTI)

There is growing interest in the development of more sustainable electricity systems employing renewable, low-emission resources. In this context, the number of wind power generators installed in the world is increasing, and there are strong indicators that such growth should continue in the next decades. The intensity of wind power expansion depends on different factors related to technical, economic, environmental, governmental, and regulatory issues. This paper presents an overview on various issues related to wind energy conversion systems.

Walmir Freitas; Ahmed Faheem Zobaa; Jose C.M. Vieira; James S. McConnach

2005-01-01T23:59:59.000Z

286

Solar energy conversion by chloroplast photoelectrochemical cells  

Science Journals Connector (OSTI)

... the photochemical cell has proved advantageous because of their ease of preparation and their power conversion efficiency of close to 1 %. Fig. l Time course of potential development. ... h even after the light was turned off, illustrated the system's ability to store energy. The ability of the cell to generate a voltage is equivalent to a generator ...

Ravindra Bhardwaj; Rong L. Pan; Elizabeth L. Gross

1981-01-29T23:59:59.000Z

287

BIOMASS ENERGY CONVERSION IN HAWAII  

E-Print Network (OSTI)

Jones and w.s. Fong, Biomass Conversion of Biomass to Fuels11902 UC-61a BIOMASS ENERGY CONVERSION IN HAWAII RonaldLBL-11902 Biomass Energy Conversion in Hawaii Ronald 1.

Ritschard, Ronald L.

2013-01-01T23:59:59.000Z

288

Improvement of isentropic efficiency of a magnetohydrodynamic power generator by radio-frequency preionization  

Science Journals Connector (OSTI)

We describe the effect of a radio-frequency (rf) power application on the performance of a magnetohydrodynamic(MHD) electrical power generator as determined through shock-tunnel-based experiments and quasi-three-dimensional numerical simulations. The temporal plasma-fluid behavior the one-dimensional plasma-fluid structure the enthalpy-entropy diagram the quality of the energy conversion efficiency and the energy flow in the power-generating system are investigated. Preionization assistance by a small amount of rf power drastically changes the entire MHD power-generating system; the MHD extraction length is considerably extended and the isentropic efficiency is significantly improved.

Tomoyuki Murakami; Yoshihiro Okuno

2009-01-01T23:59:59.000Z

289

Avatar augmented online conversation  

E-Print Network (OSTI)

One of the most important roles played by technology is connecting people and mediating their communication with one another. Building technology that mediates conversation presents a number of challenging research and ...

Vilhjálmsson, Hannes Högni

2003-01-01T23:59:59.000Z

290

Modern Biomass Conversion Technologies  

Science Journals Connector (OSTI)

This article gives an overview of the state-of-the-art of key biomass conversion technologies currently deployed and technologies that may...2...capture and sequestration technology (CCS). In doing so, special at...

Andre Faaij

2006-03-01T23:59:59.000Z

291

DANISHBIOETHANOLCONCEPT Biomass conversion for  

E-Print Network (OSTI)

DANISHBIOETHANOLCONCEPT Biomass conversion for transportation fuel Concept developed at RISÃ? and DTU Anne Belinda Thomsen (RISÃ?) Birgitte K. Ahring (DTU) #12;DANISHBIOETHANOLCONCEPT Biomass: Biogas #12;DANISHBIOETHANOLCONCEPT Pre-treatment Step Biomass is macerated The biomass is cut in small

292

Semiconductor Nanowires and Nanotubes for Energy Conversion  

E-Print Network (OSTI)

of applications, notably energy conversion. As researchnanowires for energy conversion. Chemical Reviews, 2010.Implications for solar energy conversion. Physical Review

Fardy, Melissa Anne

2010-01-01T23:59:59.000Z

293

Structured luminescence conversion layer  

DOE Patents (OSTI)

An apparatus device such as a light source is disclosed which has an OLED device and a structured luminescence conversion layer deposited on the substrate or transparent electrode of said OLED device and on the exterior of said OLED device. The structured luminescence conversion layer contains regions such as color-changing and non-color-changing regions with particular shapes arranged in a particular pattern.

Berben, Dirk; Antoniadis, Homer; Jermann, Frank; Krummacher, Benjamin Claus; Von Malm, Norwin; Zachau, Martin

2012-12-11T23:59:59.000Z

294

Conversion Plan | Department of Energy  

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

document the conversion plan that clearly defines the system or project's conversion procedures; outlines the installation of new and converted filesdatabases; coordinates the...

295

Plasmonic conversion of solar energy  

E-Print Network (OSTI)

of solar energy into electricity in photovoltaic cells orsolar energy conversion aimed at photovoltaic applicationsenergy conversion, opening a new venue for photovoltaic and

Clavero, Cesar

2014-01-01T23:59:59.000Z

296

Plasmonic conversion of solar energy  

E-Print Network (OSTI)

of carriers allows maintaining the energy conversionenergy conversion 8 Timescale of charge separation, carrierin this energy conversion method, i.e. carrier regeneration

Clavero, Cesar

2014-01-01T23:59:59.000Z

297

Simplified formulas for the digital computation of power flow in an electrical network and some new aspects of convergence  

E-Print Network (OSTI)

? CONVERGENCE ? ? . . . . . . . . . . . . . . . . . . . . V? METHODS OF ACCELERATING CONVERGENCE . . . . . . . . . . VI. RESULTS OF COMPUTATIONS WITH A SAMPLE PROBLEM . . . . . 10 Load flow number 1 . . . . . . . . . . . . . . . 2. Load flow number 2... method of attack with accelerating means to re? duce the number of iterations. Subsequent investigators concentrated their efforts in refining the nodal approach of Ward and Hale with various acceleration schemes designed to save time and labor...

Ullah, Ahmad

1959-01-01T23:59:59.000Z

298

Beilstein-Institut Reflections on Energy Conversion in  

E-Print Network (OSTI)

Beilstein-Institut Reflections on Energy Conversion in Biological and Biomimetic Systems Athel by conversion of the heat into work, chemical energy or electrical power, and the inevitable energy losses 2011 Abstract In principle any form of energy (light, electrical, potential, chemical, kinetic energy

299

Research and development studies for MHD/coal power flow train components. Technical progress report, 1 September 1979-31 August 1980  

SciTech Connect

The aim of this program is to contribute to certain facets of the development of the MHD/coal power system, and particularly the CDIF of DOE with regard to its flow train. Consideration is given specifically to the electrical power take-off, the diagnostic and instrumentation systems, the combustor and MHD channel technology, and electrode alternatives. Within the constraints of the program, high priorities were assigned to the problems of power take-off and the related characteristics of the MHD channel, and to the establishment of a non-intrusive, laser-based diagnostic system. The next priority was given to the combustor modeling and to a significantly improved analysis of particle combustion. Separate abstracts were prepared for nine of the ten papers included. One paper was previously included in the data base. (WHK)

Bloom, M. H.

1980-01-01T23:59:59.000Z

300

Advanced Energy Conversion LLC AEC | Open Energy Information  

Open Energy Info (EERE)

LLC AEC Jump to: navigation, search Name: Advanced Energy Conversion LLC (AEC) Place: New York Zip: 12020 Product: R&D company focused on power electronics, motion control systems...

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


301

High conversion efficiency ultraviolet fiber Raman oscillator--amplifier system  

SciTech Connect

High efficiency UV frequency conversion by stimulated Raman scattering in a XeCl (lambda = 308-nm) excimer laser-pumped multimode fiber is presented. The system consists of a first piece of fiber as a Stokes generator and a second as a power amplifier. Power conversion efficiencies up to 80% have been measured. Uses of fiber Raman amplifiers in the near UV are also discussed.

Pini, R.; Salimbeni, R.; Vannini, M.; Haider, A.F.M.Y.; Lin, C.

1986-04-01T23:59:59.000Z

302

Digital optical conversion module  

DOE Patents (OSTI)

A digital optical conversion module used to convert an analog signal to a computer compatible digital signal including a voltage-to-frequency converter, frequency offset response circuitry, and an electrical-to-optical converter. Also used in conjunction with the digital optical conversion module is an optical link and an interface at the computer for converting the optical signal back to an electrical signal. Suitable for use in hostile environments having high levels of electromagnetic interference, the conversion module retains high resolution of the analog signal while eliminating the potential for errors due to noise and interference. The module can be used to link analog output scientific equipment such as an electrometer used with a mass spectrometer to a computer.

Kotter, Dale K. (North Shelley, ID); Rankin, Richard A. (Ammon, ID)

1991-02-26T23:59:59.000Z

303

Digital optical conversion module  

DOE Patents (OSTI)

A digital optical conversion module used to convert an analog signal to a computer compatible digital signal including a voltage-to-frequency converter, frequency offset response circuitry, and an electrical-to-optical converter. Also used in conjunction with the digital optical conversion module is an optical link and an interface at the computer for converting the optical signal back to an electrical signal. Suitable for use in hostile environments having high levels of electromagnetic interference, the conversion module retains high resolution of the analog signal while eliminating the potential for errors due to noise and interference. The module can be used to link analog output scientific equipment such as an electrometer used with a mass spectrometer to a computer. 2 figs.

Kotter, D.K.; Rankin, R.A.

1988-07-19T23:59:59.000Z

304

A Simple Optimal Power Flow Model with Energy Storage K. Mani Chandy, Steven H. Low, Ufuk Topcu and Huan Xu  

E-Print Network (OSTI)

or solar power. In the state of California, peak demand for power in 2003 reached 52 GW, with projections decades, and a required 15% reserve margin, an additional 60 GW of new generation capacity will be needed by 2030 [8]. In 2006, Southern California Edison, the primary electricity utility company for the southern

Heaton, Thomas H.

305

A Simple Optimal Power Flow Model with Energy Storage K. Mani Chandy, Steven H. Low, Ufuk Topcu and Huan Xu  

E-Print Network (OSTI)

is motivated by the intensifying trend to deploy renewable energy such as wind or solar power. In the state of California, peak demand for power in 2003 reached 52 GW, with projections for the year 2030 exceeding 80 GW% reserve margin, an additional 60 GW of new generation capacity will be needed by 2030 [9]. In 2006

Xu , Huan

306

1462 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 26, NO. 3, AUGUST 2011 A Self-Organizing Strategy for Power Flow Control  

E-Print Network (OSTI)

con- trol algorithm that will regulate the power output of multiple pho- tovoltaic generators (PVs) in a distribution network. To this end, the cooperative control methodology from network control theory is used-00267-2010. H. Xin is with the Department of Electrical Engineering, Zhejiang University, Hangzhou

Qu, Zhihua

307

Solar Power  

Science Journals Connector (OSTI)

...of desert solar energy farm with 30 percent conversion...85 percent of the solar farm energy now reflected back...Washington, D.C. 20550. Wind Power Martin Wolf (19...counting the cost of the offshore platforms, would thus...15 billion. If these wind generators were placed...

Paul E. Damon

1974-08-09T23:59:59.000Z

308

Ocean Thermal Energy Conversion Basics | Department of Energy  

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

Thermal Energy Conversion Basics Thermal Energy Conversion Basics Ocean Thermal Energy Conversion Basics August 16, 2013 - 4:22pm Addthis A process called ocean thermal energy conversion (OTEC) uses the heat energy stored in the Earth's oceans to generate electricity. OTEC works best when the temperature difference between the warmer, top layer of the ocean and the colder, deep ocean water is about 36°F (20°C). These conditions exist in tropical coastal areas, roughly between the Tropic of Capricorn and the Tropic of Cancer. To bring the cold water to the surface, ocean thermal energy conversion plants require an expensive, large-diameter intake pipe, which is submerged a mile or more into the ocean's depths. Some energy experts believe that if ocean thermal energy conversion can become cost-competitive with conventional power technologies, it could be

309

Ocean Thermal Energy Conversion Basics | Department of Energy  

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

Thermal Energy Conversion Basics Thermal Energy Conversion Basics Ocean Thermal Energy Conversion Basics August 16, 2013 - 4:22pm Addthis A process called ocean thermal energy conversion (OTEC) uses the heat energy stored in the Earth's oceans to generate electricity. OTEC works best when the temperature difference between the warmer, top layer of the ocean and the colder, deep ocean water is about 36°F (20°C). These conditions exist in tropical coastal areas, roughly between the Tropic of Capricorn and the Tropic of Cancer. To bring the cold water to the surface, ocean thermal energy conversion plants require an expensive, large-diameter intake pipe, which is submerged a mile or more into the ocean's depths. Some energy experts believe that if ocean thermal energy conversion can become cost-competitive with conventional power technologies, it could be

310

Energy Conversion | Global and Regional Solutions  

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

Energy Conversion Group Energy Conversion Group The Energy Conversion Group offers advanced technical solutions to achieve reduced fossil fuel use in geothermal power and building energy applications. Focus is on advanced materials, biofuel end use, combustion and system concepts. We seek to continuously improve the capabilities of relevant research tools being applied in collaborative initiatives to achieving these goals. Capabilities The group conducts research in a number of energy-related areas. These include advanced materials for geothermal energy, applications of biofuels and alternative fuels, efficiency in heating/cooling equipment, advanced oil burner development and particulate emissions for wood boilers. Advanced Materials for Geothermal Energy Supercritical carbon dioxide has properties midway between a gas and a

311

E-Print Network 3.0 - advanced energy conversion Sample Search...  

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

ENERGY Biomass Fuel Cell Battery Photovoltaic Stationary... Power A123 SYSTEMS BioGas Biomass Conversion Drying Zone ... Source: Choate, Paul M. - Department of Entomology...

312

Conversion efficiency of broad-band rectennas for solar energy harvesting applications  

Science Journals Connector (OSTI)

Optical antennas have been proposed as an alternative option for solar energy harvesting. In this work the power conversion efficiency of broadband antennas, log-periodic,...

Briones, Edgar; Alda, Javier; González, Francisco Javier

2013-01-01T23:59:59.000Z

313

Process Flow Chart for Immobilizing of Radioactive High Concentration Sodium Hydroxide Product from the Sodium Processing Facility at the BN-350 Nuclear power plant in Aktau, Kazakhstan  

SciTech Connect

This paper describes the results of a joint research investigations carried out by the group of Kazakhstan, British and American specialists in development of a new material for immobilization of radioactive 35% sodium hydroxide solutions from the sodium coolant processing facility of the BN-350 nuclear power plant. The resulting solid matrix product, termed geo-cement stone, is capable of isolating long lived radionuclides from the environment. The physico-mechanical properties of geo-cement stone have been investigated and the flow chart for its production verified in a full scale experiments. (author)

Burkitbayev, M.; Omarova, K.; Tolebayev, T. [Ai-Farabi Kazakh National University, Chemical Faculty, Republic of Kazakhstan (Kazakhstan); Galkin, A. [KATEP Ltd., Republic of Kazakhstan (Kazakhstan); Bachilova, N. [NIISTROMPROEKT Ltd., Republic of Kazakhstan (Kazakhstan); Blynskiy, A. [Nuclear Technology Safety Centre, Republic of Kazakhstan (Kazakhstan); Maev, V. [MAEK-Kazatomprom Ltd., Republic of Kazakhstan (Kazakhstan); Wells, D. [NUKEM Limited- a member of the Freyssinet Group, Winfrith Technology Centre, Dorchester, Dorset (United Kingdom); Herrick, A. [NUKEM Limited- a member of the Freyssinet Group, Caithness (United Kingdom); Michelbacher, J. [Idaho National Laboratory, Idaho Falls (United States)

2008-07-01T23:59:59.000Z

314

Convergence problem in forward/backward sweep power flow method caused by non-positive-sequence impedance of distributed generators and its solution  

Science Journals Connector (OSTI)

Abstract A variety of distributed generators (DGs) are integrated in distribution system which is usually operated under three-phase unbalanced conditions. The zero and negative sequence impedances of \\{DGs\\} may vary within a large range. In this paper, the convergence problem caused by the zero and negative sequence impedances of \\{DGs\\} in forward/backward sweep three-phase power flow is found through numerical experiments. The reason of this phenomenon is explained and an impedance compensation method is proposed to solve this problem.

Yuntao Ju; Wenchuan Wu; Boming Zhang

2014-01-01T23:59:59.000Z

315

Flow Duration Curve Load Duration Curve  

E-Print Network (OSTI)

given flow and concentration data--select appropriate conversion factors 3. Develop Load Duration Curve 4. Plot observed data with Load Duration Curve #12;What are they? How do you make one? #12;DescribesRangeFlows LowFlows 40 % of the time there has been no flow at this site #12;Gather daily flow rate data Load

316

Energy Conversion to Electricity  

Science Journals Connector (OSTI)

30 May 1974 research-article Energy Conversion to Electricity D. Clark...continuing growth in the demand for energy, and of electricity as the route...the electricity share of the total energy market and of the substitution of electricity...

1974-01-01T23:59:59.000Z

317

Solar Energy Conversion  

Science Journals Connector (OSTI)

If solar energy is to become a practical alternative to fossil fuels we must have efficient ways to convert photons into electricity fuel and heat. The need for better conversion technologies is a driving force behind many recent developments in biology materials and especially nanoscience.

George W. Crabtree; Nathan S. Lewis

2008-01-01T23:59:59.000Z

318

Campus Conversations: CLIMATE CHANGE  

E-Print Network (OSTI)

review and input from scholars with expertise in climate change and communication. #12; Welcome Thank youCampus Conversations: CLIMATE CHANGE AND THE CAMPUS Southwestern Pennsylvania Program booklet is an adaptation and updating of Global Warming and Climate Change, a brochure developed in 1994

Attari, Shahzeen Z.

319

Solar energy conversion.  

SciTech Connect

If solar energy is to become a practical alternative to fossil fuels, we must have efficient ways to convert photons into electricity, fuel, and heat. The need for better conversion technologies is a driving force behind many recent developments in biology, materials, and especially nanoscience. The Sun has the enormous untapped potential to supply our growing energy needs. The barrier to greater use of the solar resource is its high cost relative to the cost of fossil fuels, although the disparity will decrease with the rising prices of fossil fuels and the rising costs of mitigating their impact on the environment and climate. The cost of solar energy is directly related to the low conversion efficiency, the modest energy density of solar radiation, and the costly materials currently required. The development of materials and methods to improve solar energy conversion is primarily a scientific challenge: Breakthroughs in fundamental understanding ought to enable marked progress. There is plenty of room for improvement, since photovoltaic conversion efficiencies for inexpensive organic and dye-sensitized solar cells are currently about 10% or less, the conversion efficiency of photosynthesis is less than 1%, and the best solar thermal efficiency is 30%. The theoretical limits suggest that we can do much better. Solar conversion is a young science. Its major growth began in the 1970s, spurred by the oil crisis that highlighted the pervasive importance of energy to our personal, social, economic, and political lives. In contrast, fossil-fuel science has developed over more than 250 years, stimulated by the Industrial Revolution and the promise of abundant fossil fuels. The science of thermodynamics, for example, is intimately intertwined with the development of the steam engine. The Carnot cycle, the mechanical equivalent of heat, and entropy all played starring roles in the development of thermodynamics and the technology of heat engines. Solar-energy science faces an equally rich future, with nanoscience enabling the discovery of the guiding principles of photonic energy conversion and their use in the development of cost-competitive new technologies.

Crabtree, G. W.; Lewis, N. S. (Materials Science Division); (California Inst. of Tech.)

2008-03-01T23:59:59.000Z

320

Proceedings of the 25th intersociety energy conversion engineering conference  

SciTech Connect

This book contains the proceedings of the 25th Intersociety Energy Conversion Engineering Conference. Volume 5 is organized under the following headings: Photovoltaics I, Photovoltaics II, Geothermal power, Thermochemical conversion of biomass, Energy from waste and biomass, Solar thermal systems for environmental applications, Solar thermal low temperature systems and components, Solar thermal high temperature systems and components, Wind systems, Space power sterling technology Stirling cooler developments, Stirling solar terrestrial I, Stirling solar terrestrial II, Stirling engine generator sets, Stirling models and simulations, Stirling engine analysis, Stirling models and simulations, Stirling engine analysis, Stirling engine loss understanding, Novel engine concepts, Coal conversion and utilization, Power cycles, MHD water propulsion I, Underwater vehicle powerplants - performance, MHD underwater propulsion II, Nuclear power, Update of advanced nuclear power reactor concepts.

Nelson, P.A.; Schertz, W.W.; Till, R.H.

1990-01-01T23:59:59.000Z

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


321

Journal of Power Sources xxx (2006) xxxxxx The impact of channel path length on PEMFC flow-field design  

E-Print Network (OSTI)

in three dimensions in a PEMFC. These distributions can lead to flooding or drying of the membrane that may; Flow-field design; Fuel cell simulation; Commercial size PEMFC; Parallel computing; ES-PEMFC 1 flooding when the local partial pressure of water exceeds the saturation pressure for water at the local

Van Zee, John W.

322

Flow Accelerated Erosion-Corrosion (FAC) considerations for secondary side piping in the AP1000{sup R} nuclear power plant design  

SciTech Connect

The issue of Flow Accelerated Erosion-Corrosion (FAC) in power plant piping is a known phenomenon that has resulted in material replacements and plant accidents in operating power plants. Therefore, it is important for FAC resistance to be considered in the design of new nuclear power plants. This paper describes the design considerations related to FAC that were used to develop a safe and robust AP1000{sup R} plant secondary side piping design. The primary FAC influencing factors include: - Fluid Temperature - Pipe Geometry/layout - Fluid Chemistry - Fluid Velocity - Pipe Material Composition - Moisture Content (in steam lines) Due to the unknowns related to the relative impact of the influencing factors and the complexities of the interactions between these factors, it is difficult to accurately predict the expected wear rate in a given piping segment in a new plant. This paper provides: - a description of FAC and the factors that influence the FAC degradation rate, - an assessment of the level of FAC resistance of AP1000{sup R} secondary side system piping, - an explanation of options to increase FAC resistance and associated benefits/cost, - discussion of development of a tool for predicting FAC degradation rate in new nuclear power plants. (authors)

Vanderhoff, J. F.; Rao, G. V. [Westinghouse Electric Company LLC, 1000 Westinghouse Drive, Cranberry Township, PA 16066 (United States); Stein, A. [Shaw Power Nuclear, 1000 Technology Center Drive, Stoughton, MA 02072 (United States)

2012-07-01T23:59:59.000Z

323

Energy Conversion Unit with Optimized Waveform Generation Sally Sajadian and Euzeli C. dos Santos Jr.  

E-Print Network (OSTI)

Energy Conversion Unit with Optimized Waveform Generation Sally Sajadian and Euzeli C. dos Santos to increase the efficiency of the devices dealing with energy conversion. The power supplies devices able and interleaved converters. This paper proposes an energy conversion unit constituted by a single-phase DC

Zhou, Yaoqi

324

A Framework for Reliability and Performance Assessment of Wind Energy Conversion Systems  

E-Print Network (OSTI)

1 A Framework for Reliability and Performance Assessment of Wind Energy Conversion Systems proposes a framework for reliability and dynamic performance assessment of wind energy conversion systems--Reliability, Dynamic Performance, Wind Power, Wind Energy Conversion System (WECS), Doubly-Fed Induction Generator

Liberzon, Daniel

325

EIS-0083: Final Northeast Regional Environmental Impact Statement; The Potential Conversion of Forty-Two Powerplants From Oil to Coal or Alternate Fuels  

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

This Economic Regulatory Administration statement assesses the potential for cumulative and interactive environmental impacts resulting from conversion of up to 42 northeastern power plants from oil to coal and from an alternative “Voluntary Conversion” scenario for 27 power plants.

326

Modeling a vanadium redox flow battery system for large scale applications  

Science Journals Connector (OSTI)

A simulation model of a vanadium redox flow battery (VRFB) system based on measurements with a kilowatt scale real life VRFB unit was developed. Various hourly charging and discharging cycles were performed for states of charge (SOC) of 75%, 60%, 40% and 20% at different power values ranging from 2 kW to 10 kW. The dependence of the overall system efficiency in a VRFB unit on the SOC was determined by considering the energy losses at stacks during the electrochemical conversion and by the auxiliary power consumption of the hydraulic circuits as well as the power conversion systems. Using the model, optimal number of modules for certain power levels during charging and discharging operations were estimated for megawatt scale operations.

Burak Turker; Sebastian Arroyo Klein; Eva-Maria Hammer; Bettina Lenz; Lidiya Komsiyska

2013-01-01T23:59:59.000Z

327

Wind Effect, Recirculation and Thermal Flow Field of a Direct Air?cooled Condenser for a Large Power Plant  

Science Journals Connector (OSTI)

The thermal effect experiments were carried out of a direct air?cooled system in the low speed wind tunnel. The influence of effect factors on recirculation is also discussion after that the relationship between the thermal flow field structure and recirculation ratio under the cooling tower is analyzed. At last the engineering measures to reduce or avoid recirculation are proposed. For certain conditions the experimental measurement shows close agreement with numerical values.

W. L. Zhao; P. Q. Liu; H. S. Duan; J. Y. Zhu

2011-01-01T23:59:59.000Z

328

In-space power rejection management via indirect annular flow liquid film management - process design and feasibility  

E-Print Network (OSTI)

scoping calculations for a supercritical organic Rankine cycle experiment that uses the SLIC process as its condenser and is geometrically constrained to the dimensions of a NASA GAS container. The SLIC Steady-State Mathematical Model chapter... of the SLIC to maintain the design energy balance of the experiment. The experiment (approximately 28 kg) was a supercritical organic Rankine engine operating between 500 and 400 Kelvin at a mass flow of 1 gram per second; using R-113 as the working fluid...

Williams, Rube Ben

2012-06-07T23:59:59.000Z

329

Flexible Conversion Ratio Fast Reactor Systems Evaluation  

SciTech Connect

Conceptual designs of lead-cooled and liquid salt-cooled fast flexible conversion ratio reactors were developed. Both concepts have cores reated at 2400 MWt placed in a large-pool-type vessel with dual-free level, which also contains four intermediate heat exchanges coupling a primary coolant to a compact and efficient supercritical CO2 Brayton cycle power conversion system. Decay heat is removed passively using an enhanced Reactor Vessel Auxiliary Cooling System and a Passive Secondary Auxiliary Cooling System. The most important findings were that (1) it is feasible to design the lead-cooled and salt-cooled reactor with the flexible conversion ratio (CR) in the range of CR=0 and CR=1 n a manner that achieves inherent reactor shutdown in unprotected accidents, (2) the salt-cooled reactor requires Lithium thermal Expansion Modules to overcme the inherent salt coolant's large positive coolant temperature reactivity coefficient, (3) the preferable salt for fast spectrum high power density cores is NaCl-Kcl-MgCl2 as opposed to fluoride salts due to its better themal-hydraulic and neutronic characteristics, and (4) both reactor, but attain power density 3 times smaller than that of the sodium-cooled reactor.

Neil Todreas; Pavel Hejzlar

2008-06-30T23:59:59.000Z

330

Progressive network-flow based power-aware broadcast addressing for pin-constrained digital microfluidic biochips  

Science Journals Connector (OSTI)

In recent emerging marketplace, designs for pin-constrained digital microfluidic biochips (PDMFBs) have received much attention due to the large impact on packaging and product cost. One of the major approaches, broadcast addressing, reduces the ... Keywords: digital microfluidics, electrode addressing, power

Tsung-Wei Huang; Hong-Yan Su; Tsung-Yi Ho

2011-06-01T23:59:59.000Z

331

MHK Technologies/Ocean Wave Power Spar Buoy Engine | Open Energy  

Open Energy Info (EERE)

Spar Buoy Engine Spar Buoy Engine < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Wave Power Spar Buoy Engine.jpg Technology Profile Primary Organization Functional Design Engineering Inc Technology Resource Click here Wave Technology Type Click here Point Absorber - Submerged Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description A long period spar buoy supports a subsurface flow augmentor The augmentor directs water from the wave s submarine flow field to a free prime mover piston The prime mover is decoupled from the machine s PTO during times in the wave s cycle when there is little power available for conversion Wave energy is stored in the device until the is enough flow magnetude that power take off can efficiently take place Power can be taken off as high pressure water crankshaft torque or directly as DC electricity

332

Next-Generation Thermionic Solar Energy Conversion  

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

This fact sheet describes a next-generation thermionic solar energy conversion project awarded under the DOE's 2012 SunShot Concentrating Solar Power R&D award program. The team, led by Stanford University, seeks to demonstrate the feasibility of photon-enhanced, microfabricated thermionic energy converters as a high-efficiency topping cycle for CSP electricity generation. With the potential to double the electricity output efficiency of solar-thermal power stations, this topping cycle application can significantly reduce the cost of solar-thermal electricity below that of the lowest-cost, fossil-fuel generated electricity.

333

Network Wind Power Over the Pacific Northwest. Progress Report, October 1979-September 1980.  

SciTech Connect

The research in FY80 is composed of six primary tasks. These tasks include data collection and analysis, wind flow studies around an operational wind turbine generator (WTG), kite anemometer calibration, wind flow analysis and prediction, the Klickitat County small wind energy conversion system (SWECS) program, and network wind power analysis. The data collection and analysis task consists of four sections, three of which deal with wind flow site surveys and the fourth with collecting and analyzing wind data from existing data stations. This report also includes an appendix which contains mean monthly wind speed data summaries, wind spectrum summaries, time series analysis plots, and high wind summaries.

Baker, Robert W.; Hewson, E. Wendell

1980-10-01T23:59:59.000Z

334

Semiconductor Nanowires and Nanotubes for Energy Conversion  

E-Print Network (OSTI)

Nanowires and Nanotubes for Energy Conversion By MelissaNanowires and Nanotubes for Energy Conversion by MelissaNanowires and Nanotubes for Energy Conversion by Melissa

Fardy, Melissa Anne

2010-01-01T23:59:59.000Z

335

OCEAN THERMAL ENERGY CONVERSION PROGRAMMATIC ENVIRONMENTAL ASSESSMENT  

E-Print Network (OSTI)

Ocean Thermal Energy Conversion (OTEC) Draft Programmaticof ocean thermal energy conversion technology. U.S. Depart~on Ocean TherUial Energy Conversion, June 18, 1979. Ocean

Sands, M.Dale

2013-01-01T23:59:59.000Z

336

Advanced Conversion Roadmap Workshop | Department of Energy  

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

Advanced Conversion Roadmap Workshop DOE introduction slides to the Advanced Conversion Roadmap Workshop webinar. ctabwebinardoe.pdf More Documents & Publications Conversion...

337

X-ray Structure in Cluster Cooling Flows and Its Relationship to Star Formation and Powerful Radio Sources  

E-Print Network (OSTI)

Analyses of Chandra's first images of cooling flow clusters find smaller cooling rates than previously thought. Cooling may be occurring preferentially near regions of star formation in central cluster galaxies, where the local cooling and star formation rates agree to within factors of a few. The radio sources in central cluster galaxies are interacting with and are often displacing the hot, intracluster gas. X-ray ``bubbles'' seen in Chandra images are used to measure the amount of energy radio sources deposit into their surroundings, and they may survive as fossil records of ancient radio activity. The bubbles are vessels that transport magnetic fields from giant black holes to the outskirts of clusters.

B. R. McNamara

2001-05-31T23:59:59.000Z

338

E-Print Network 3.0 - air flow fields Sample Search Results  

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

Energy Technologies Division, Lawrence Berkeley National Laboratory Collection: Energy Storage, Conversion and Utilization 4 Accuracy of Flow Hoods in Residential...

339

Experimental and Analytical Studies on Pyroelectric Waste Heat Energy Conversion  

E-Print Network (OSTI)

energy conversion . . . . . . . . . . . . . . . . . . . . . . . . . .other pyroelectric energy conversion methods . . . . Chapter6 Pyroelectric Energy Conversion using PLZT and

Lee, Felix

2012-01-01T23:59:59.000Z

340

Assessment of Microbial Fouling in an Ocean Thermal Energy Conversion Experiment  

Science Journals Connector (OSTI)

...Proceedings of the Ocean Thermal Energy Conversion...Claude, G. 1930. Power from the tropical seas...Metz, W. D. 1977. Ocean thermal energy: the biggest gamble in solar power. Science 198:178-180...studies, p. 1-53. In Ocean Thermal Energy Conversion...

R. Paul Aftring; Barrie F. Taylor

1979-10-01T23:59:59.000Z

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


341

Zinc phosphate conversion coatings  

DOE Patents (OSTI)

Zinc phosphate conversion coatings for producing metals which exhibit enhanced corrosion prevention characteristics are prepared by the addition of a transition-metal-compound promoter comprising a manganese, iron, cobalt, nickel, or copper compound and an electrolyte such as polyacrylic acid, polymethacrylic acid, polyitaconic acid and poly-L-glutamic acid to a phosphating solution. These coatings are further improved by the incorporation of Fe ions. Thermal treatment of zinc phosphate coatings to generate .alpha.-phase anhydrous zinc phosphate improves the corrosion prevention qualities of the resulting coated metal.

Sugama, Toshifumi (Wading River, NY)

1997-01-01T23:59:59.000Z

342

Zinc phosphate conversion coatings  

DOE Patents (OSTI)

Zinc phosphate conversion coatings for producing metals which exhibit enhanced corrosion prevention characteristics are prepared by the addition of a transition-metal-compound promoter comprising a manganese, iron, cobalt, nickel, or copper compound and an electrolyte such as polyacrylic acid, polymethacrylic acid, polyitaconic acid and poly-L-glutamic acid to a phosphating solution. These coatings are further improved by the incorporation of Fe ions. Thermal treatment of zinc phosphate coatings to generate {alpha}-phase anhydrous zinc phosphate improves the corrosion prevention qualities of the resulting coated metal. 33 figs.

Sugama, T.

1997-02-18T23:59:59.000Z

343

Final Environmental Impact Statement for Construction and Operation of a Depleted Uranium Hexafluoride Conversion Facility at the Paducah, Kentucky, Site  

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

Paducah DUF Paducah DUF 6 Conversion Final EIS FIGURE S-1 Regional Map of the Paducah, Kentucky, Site Vicinity Summary S-18 Paducah DUF 6 Conversion Final EIS FIGURE S-3 Three Alternative Conversion Facility Locations within the Paducah Site, with Location A Being the Preferred Alternative (A representative conversion facility footprint is shown within each location.) Summary S-20 Paducah DUF 6 Conversion Final EIS FIGURE S-4 Conceptual Overall Material Flow Diagram for the Paducah Conversion Facility Summary S-21 Paducah DUF 6 Conversion Final EIS FIGURE S-5 Conceptual Conversion Facility Site Layout for Paducah Summary S-28 Paducah DUF 6 Conversion Final EIS FIGURE S-6 Areas of Potential Impact Evaluated for Each Alternative Alternatives 2-7 Paducah DUF 6 Conversion Final EIS

344

WEC up! Energy Department Announces Wave Energy Conversion Prize Administrator  

Office of Energy Efficiency and Renewable Energy (EERE)

The Water Power Program today awarded $6.5 million to a Prize Administration Team for the development and execution of the Energy Department’s Wave Energy Conversion (WEC) Prize Competition. The WEC Prize will continue to advance marine and hydrokinetic (MHK) technology as a viable source for America’s clean energy future, in part by providing an opportunity for developers to test their innovative wave energy conversion (WEC) devices in a wave generating basin.

345

22 - Conversion Factors  

Science Journals Connector (OSTI)

Abstract This chapter details the viscosity and pressure conversion chart. To convert absolute or dynamic viscosity from one set of units to another, one must locate the given set of units in the left-hand column then multiply the numerical value by the factor shown horizontally to the right-hand side, under the set of units desired. The chapter also explains that to convert kinematic viscosity from one set of units to another, one must locate the given set of units in the left-hand column and multiply the numerical value by the factor shown horizontally to the right-hand side, under the set of units desired. The chapter also defines how the conversion from natural gas to other fuels has progressed from possibility to reality for many companies and will become necessary for many others in months and years ahead. Fuels that are considered practical replacements for gas include coal, heavy fuel oils, middle distillates (such as kerosine–typeturbo fuel and burner fuel oils) and liquefied petroleum gas.

2014-01-01T23:59:59.000Z

346

Ocean Thermal Energy Conversion  

Science Journals Connector (OSTI)

A pertinent question, however, is: what is the worldwide power resource that could be extracted with OTEC plants without affecting the thermohaline ocean circulation? The estimate is that the maximum steady-state...

Dr. Luis A. Vega Ph.D.

2013-01-01T23:59:59.000Z

347

Ocean Thermal Energy Conversion  

Science Journals Connector (OSTI)

A pertinent question, however, is: what is the worldwide power resource that could be extracted with OTEC plants without affecting the thermohaline ocean circulation? The estimate is that the maximum steady-state...

Dr. Luis A. Vega Ph.D.

2012-01-01T23:59:59.000Z

348

Flow Characteristics Analysis of Widows' Creek Type Control Valve for Steam Turbine Control  

SciTech Connect

The steam turbine converts the kinetic energy of steam to mechanical energy of rotor blades in the power conversion system of fossil and nuclear power plants. The electric output from the generator of which the rotor is coupled with that of the steam turbine depends on the rotation velocity of the steam turbine bucket. The rotation velocity is proportional to the mass flow rate of steam entering the steam turbine through valves and nozzles. Thus, it is very important to control the steam mass flow rate for the load following operation of power plants. Among various valves that control the steam turbine, the control valve is most significant. The steam flow rate is determined by the area formed by the stem disk and the seat of the control valve. While the ideal control valve linearly controls the steam mass flow rate with its stem lift, the real control valve has various flow characteristic curves pursuant to the stem lift type. Thus, flow characteristic curves are needed to precisely design the control valves manufactured for the operating conditions of nuclear power plants. OMEGA (Optimized Multidimensional Experiment Geometric Apparatus) was built to experimentally study the flow characteristics of steam flowing inside the control valve. The Widows' Creek type control valve was selected for reference. Air was selected as the working fluid in the OMEGA loop to exclude the condensation effect in this simplified approach. Flow characteristic curves were plotted by calculating the ratio of the measured mass flow rate versus the theoretical mass flow rate of the air. The flow characteristic curves are expected to be utilized to accurately design and operate the control valve for fossil as well as nuclear plants. (authors)

Yoo, Yong H.; Sohn, Myoung S.; Suh, Kune Y. [PHILOSOPHIA, Inc., Seoul National University, San 56-1 Sillim-dong, Gwanak-gu, Seoul, 151-742 (Korea, Republic of)

2006-07-01T23:59:59.000Z

349

Acoustic conversion of heat to sound at mid?audio frequencies  

Science Journals Connector (OSTI)

A thermoacoustic prime mover was developed for conversion of heat to sound that is then directly converted to electricity. The acoustic device consists of a 2.7?kHz quarter?wave resonator with a stack of random material between a hot heat exchanger and a cold heat exchanger. It is loaded by a cavity that couples the sound to a piezoelectric device for generation of electrical power. Optimization of this device for energy conversion was based on studies of heat injection temperature difference threshold for onset of oscillation heat flow in the device quality factor Q of the resonator response time to heat input and sound power output. Parameters for optimization included different mesh sizes for the heat exchangers given stack filling factors and levels of positive feedback from the acoustic cavity. Response time to heat injection was lowered by coupling the heat source directly to the hot heat exchanger. Device efficiency was doubled by reducing heat losses along the supporting structure of the stack. Temperature differences for oscillation were as low as 50°C and sound levels of 130 dB were achieved. Thus device performance was enhanced substantially by optimizing geometric factors.

2007-01-01T23:59:59.000Z

350

Quantum optical waveform conversion  

E-Print Network (OSTI)

Currently proposed architectures for long-distance quantum communication rely on networks of quantum processors connected by optical communications channels [1,2]. The key resource for such networks is the entanglement of matter-based quantum systems with quantum optical fields for information transmission. The optical interaction bandwidth of these material systems is a tiny fraction of that available for optical communication, and the temporal shape of the quantum optical output pulse is often poorly suited for long-distance transmission. Here we demonstrate that nonlinear mixing of a quantum light pulse with a spectrally tailored classical field can compress the quantum pulse by more than a factor of 100 and flexibly reshape its temporal waveform, while preserving all quantum properties, including entanglement. Waveform conversion can be used with heralded arrays of quantum light emitters to enable quantum communication at the full data rate of optical telecommunications.

D Kielpinski; JF Corney; HM Wiseman

2010-10-11T23:59:59.000Z

351

Proceedings of the XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser Conference, Edinburgh, UK 25-30 August 1996, SPIE Vol. 3092, ed. H.J. Baker, pp. 758-763 (1997).  

E-Print Network (OSTI)

Proceedings of the XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser of 20 mm were obtained in aluminum and 41 mm in carbon steel using an N2 gas assist and 5-6 kW of power study of cutting thick aluminum and steel with a chemical oxygen-iodine laser using an N2 or O2 gas

Carroll, David L.

352

Glasses for solar energy conversion systems  

Science Journals Connector (OSTI)

Solar technologies are projected to increase tremendously over the next 10 years. Glasses are playing an important role as transparent materials of photovoltaic (PV) cells and concentrating solar power (CSP) systems. Glasses are materials of short energy payback time and environmental compatibility suitable for sustainable energy concepts. The paper reviews recent solar applications. Surface structuring and coating of glasses are shown to improve energy efficiency for solar conversion systems substantially. Encapsulated glass-to-glass PV modules and solar photocatalytic glass surfaces are identified as elements of a green architecture combining renewable power generating and destruction of air pollutants of urban environments. Emerging solar technologies for power generation, including transparent PV modules, solar chimney and thermoelectric systems may become significant areas of future solar glass applications.

J. Deubener; G. Helsch; A. Moiseev; H. Bornhöft

2009-01-01T23:59:59.000Z

353

BIOMASS ENERGY CONVERSION IN HAWAII  

E-Print Network (OSTI)

Operations, vol. 2 of Biomass Energy (Stanford: StanfordPhotosynthethic Pathway Biomass Energy Production," ~c:_! _LBL-11902 UC-61a BIOMASS ENERGY CONVERSION IN HAWAII

Ritschard, Ronald L.

2013-01-01T23:59:59.000Z

354

Energy conversion by gravitational waves  

Science Journals Connector (OSTI)

... out that if such particles are charged, the accelerations will constitute a mechanism for the conversion of gravitational ... of gravitational energy into electromagnetic ...

H. BONDI; F. A. E. PIRANI

1988-03-17T23:59:59.000Z

355

Compact anhydrous HCl to aqueous HCl conversion system  

DOE Patents (OSTI)

The present invention is directed to an inexpensive and compact apparatus adapted for use with a .sup.196 Hg isotope separation process and the conversion of anhydrous HCl to aqueous HCl without the use of air flow to carry the HCl vapor into the converter system.

Grossman, Mark W. (Belmont, MA); Speer, Richard (S. Hamilton, MA)

1993-01-01T23:59:59.000Z

356

Energy Conversion from Salinity Gradients by Forward Osmosis–Electrokinetics  

Science Journals Connector (OSTI)

Energy Conversion from Salinity Gradients by Forward Osmosis–Electrokinetics ... Through the use of a salinity gradient, a suction force is created to induce a hydrodynamic flow in the FO submodule based on the principle of FO. ... Kiviat, F. E.Energy Recovery from Saline Water by Means of Electrochemical Cells Science 1976, 194, 719– 720 ...

Yanmei Jiao; Chun Yang; Yuejun Kang

2014-03-12T23:59:59.000Z

357

Alternative Fuels Data Center: Conversion Regulations  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Conversion Regulations Conversion Regulations to someone by E-mail Share Alternative Fuels Data Center: Conversion Regulations on Facebook Tweet about Alternative Fuels Data Center: Conversion Regulations on Twitter Bookmark Alternative Fuels Data Center: Conversion Regulations on Google Bookmark Alternative Fuels Data Center: Conversion Regulations on Delicious Rank Alternative Fuels Data Center: Conversion Regulations on Digg Find More places to share Alternative Fuels Data Center: Conversion Regulations on AddThis.com... Conversion Regulations All vehicle and engine conversions must meet standards instituted by the U.S. Environmental Protection Agency (EPA), the National Highway Traffic Safety Administration (NHTSA), and state agencies like the California Air Resources Board (CARB).

358

Next Generation Power Electronics National Manufacturing Innovation...  

Energy Savers (EERE)

components of modern data center systems. WBG chips will eliminate up to 90% of the energy losses in today's rectifiers that perform these conversions. WBG-based power...

359

Microsoft PowerPoint - Carlsen.ppt  

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

* Pursuing balanced portfolio of renewable and low carbon options - Substantial existing hydro and pumped storage - Biomass * Mitchell conversion 2012 * Studying re-powering and...

360

Final Environmental Impact Statement for Construction and Operation of a Depleted Uranium Hexafluoride Conversion Facility at Portsmouth, Ohio, Site  

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

Portsmouth DUF Portsmouth DUF 6 Conversion Final EIS FIGURE S-1 Regional Map of the Portsmouth, Ohio, Site Vicinity Summary S-18 Portsmouth DUF 6 Conversion Final EIS FIGURE S-3 Three Alternative Conversion Facility Locations within the Portsmouth Site, with Location A Being the Preferred Alternative (A representative conversion facility footprint is shown within each location.) Summary S-20 Portsmouth DUF 6 Conversion Final EIS FIGURE S-4 Conceptual Overall Material Flow Diagram for the Portsmouth Conversion Facility Summary S-21 Portsmouth DUF 6 Conversion Final EIS FIGURE S-5 Conceptual Conversion Facility Site Layout for Portsmouth Summary S-25 Portsmouth DUF 6 Conversion Final EIS FIGURE S-6 Potential Locations for Construction of a New Cylinder Storage Yard at Portsmouth

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


361

5, 35333559, 2005 Catalytic conversion  

E-Print Network (OSTI)

measurement technique, employing selective gas- phase catalytic conversion of methanol to formaldehyde it the second most abundant organic trace gas after methane. Methanol can play an important role in upper tropoACPD 5, 3533­3559, 2005 Catalytic conversion of methanol to formaldehyde S. J. Solomon et al. Title

Paris-Sud XI, Université de

362

Secondary Capture of Chlorine and Sulfur during Thermal Conversion of Biomass  

Science Journals Connector (OSTI)

Secondary Capture of Chlorine and Sulfur during Thermal Conversion of Biomass ... Six biomasses with different chemical compositions ... ... Therefore, different types of woody biomass and biomass residues (shells) were thermochemically converted in an atmospheric flow ... ...

Jacob N. Knudsen; Peter A. Jensen; Weigang Lin; Kim Dam-Johansen

2005-02-10T23:59:59.000Z

363

Molecular approaches to solar energy conversion: the energetic cost of charge separation from molecular-excited states  

Science Journals Connector (OSTI)

...longer-lived charge carriers shows clear...molecular-based solar energy conversion systems...monochromatic power conversion efficiency...additional energy and quantum...collecting charge carriers at the device...all solar energy conversion systems where...long-lived charge carriers. We and...

2013-01-01T23:59:59.000Z

364

Most Viewed Documents - Power Generation and Distribution | OSTI, US Dept  

Office of Scientific and Technical Information (OSTI)

Most Viewed Documents - Power Generation and Distribution Most Viewed Documents - Power Generation and Distribution Electric power high-voltage transmission lines: Design options, cost, and electric and magnetic field levels Stoffel, J.B.; Pentecost, E.D.; Roman, R.D.; et al. (1994) ASPEN Plus Simulation of CO2 Recovery Process Charles W. White III (2003) Systems and economic analysis of microalgae ponds for conversion of CO{sub 2} to biomass. Quarterly technical progress report, September 1993--December 1993 Benemann, J.R.; Oswald, W.J. (1994) Load flow analysis: Base cases, data, diagrams, and results Portante, E.C.; Kavicky, J.A.; VanKuiken, J.C.; et al. (1997) Multilevel converters -- A new breed of power converters Lai, J.S. [Oak Ridge National Lab., TN (United States). Engineering Technology Div.]; Peng, F.Z. [Univ. of Tennessee, Knoxville, TN (United

365

Semiconductor nanowires for photovoltaic and photoelectrochemical energy conversion  

SciTech Connect

Semiconductor nanowires (NW) possess several beneficial properties for efficient conversion of solar energy into electricity and chemical energy. Due to their efficient absorption of light, short distances for minority carriers to travel, high surface-to-volume ratios, and the availability of scalable synthesis methods, they provide a pathway to address the low cost-to-power requirements for wide-scale adaptation of solar energy conversion technologies. Here we highlight recent progress in our group towards implementation of NW components as photovoltaic and photoelectrochemical energy conversion devices. An emphasis is placed on the unique properties of these one-dimensional (1D) structures, which enable the use of abundant, low-cost materials and improved energy conversion efficiency compared to bulk devices.

Dasgupta, Neil; Yang, Peidong

2013-01-23T23:59:59.000Z

366

Management and Uses Conversion Activities  

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

Conversion Conversion Depleted UF6 Conversion DOE is planning to build two depleted UF6 conversion facilities, and site-specific environmental impact statements (EISs) to evaluate project alternatives. The Final Plan for Conversion and the Programmatic EIS The eventual disposition of depleted UF6 remains the subject of considerable interest within the U.S. Congress, and among concerned citizens and other stakeholders. Congress stated its intentions in Public Law (P. L.) 105-204, signed by the President in July 1998. P. L. 105-204 required DOE to develop a plan to build two depleted UF6 conversion facilities, one each at Portsmouth, Ohio, and Paducah, Kentucky. DOE submitted the required plan, Final Plan for the Conversion of Depleted Uranium Hexafluoride, to Congress in July 1999. This document provided a discussion of DOE's technical approach and schedule to implement this project. Although much of the information provided in this report is still valid, a few aspects of this plan have changed since its publication.

367

EPA Redesigns Conversion Certification Policies  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

EPA Redesigns EPA Redesigns Conversion Certification Policies At a recent meeting held in Washington, DC, officials from the U.S. Environmental Protection Agency (EPA) opened dialogue about proposed changes to its emission certification policies that affect alternative fuel vehicles (AFVs). "We are trying to accommo- date the Energy Policy Act (EPAct) and Executive Order requirements while trying to change enforce- ment policies and guidance with respect to conversions," said Rich Ackerman of EPA's Enforcement Office. The meeting, attended by representatives of more than 60 organizations, was held to discuss actions addressing AFV emission certification. Specifically, topics included * Conversion emissions perfor- mance data * Status of environmental laws pertaining to alternative fuel

368

Thermal Conversion Process (TCP) Technology  

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

Changing World Technologies' Changing World Technologies' Thermal Conversion Process Commercial Demonstration Plant DOE/EA 1506 Weld County, Colorado December 2004 U.S. DEPARTMENT OF ENERGY GOLDEN FIELD OFFICE 1617 Cole Boulevard Golden, Colorado 80401 Thermal Conversion Process (TCP) Technology Commercial Demonstration - Weld County, CO TABLE OF CONTENTS Environmental Assessment Thermal Conversion Process (TCP) Technology Commercial Demonstration Project Weld County, Colorado SUMMARY............................................................................................................................. S-1 1.0 INTRODUCTION.........................................................................................................1-1 1.1. National Environmental Policy Act and Related Procedures...........................1-1

369

Internal electron conversion of the isomeric {sup 57}Fe nucleus state with an energy of 14.4 keV excited by the radiation of the plasma of a high-power femtosecond laser pulse  

SciTech Connect

We recorded the spectrum of delayed secondary electrons ejected from the target, which was coated with a layer of iron enriched with the {sup 57}Fe isotope to 98%, under its irradiation by fluxes of broadband X-ray radiation and fast electrons from the plasma produced by a femtosecond laser pulse at an intensity of 10{sup 17} W cm{sup -2}. Maxima were identified at energies of 5.6, 7.2, and 13.6 keV in the spectrum obtained for a delay of 90 - 120 ns. The two last-listed maxima owe their origin to the internal electron conversion of the isomeric level with an energy of 14.4 keV and a lifetime of 98 ns to the K and L shells of atomic iron, respectively; the first-named level arises from a cascade K - L{sub 2}L{sub 3} Auger process. Photoexcitaion by the X-ray plasma radiation is shown to be the principal channel of the isomeric level excitation. (interaction of laser radiation with matter)

Golovin, G V; Savel'ev-Trofimov, Andrei B; Uryupina, D S; Volkov, Roman V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)

2011-03-31T23:59:59.000Z

370

SunShot Initiative: Next-Generation Thermionic Solar Energy Conversion  

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

Next-Generation Thermionic Solar Next-Generation Thermionic Solar Energy Conversion to someone by E-mail Share SunShot Initiative: Next-Generation Thermionic Solar Energy Conversion on Facebook Tweet about SunShot Initiative: Next-Generation Thermionic Solar Energy Conversion on Twitter Bookmark SunShot Initiative: Next-Generation Thermionic Solar Energy Conversion on Google Bookmark SunShot Initiative: Next-Generation Thermionic Solar Energy Conversion on Delicious Rank SunShot Initiative: Next-Generation Thermionic Solar Energy Conversion on Digg Find More places to share SunShot Initiative: Next-Generation Thermionic Solar Energy Conversion on AddThis.com... Concentrating Solar Power Systems Components Competitive Awards CSP Research & Development Thermal Storage CSP Recovery Act Baseload

371

Surface Tension Mediated Conversion of Light to Work David Okawa,,  

E-Print Network (OSTI)

to a high energy intermediate (e.g., electrical potential, thermal loading, or chemical fuel), which- taics for conversion to electricity, solar thermal for water heating, fast growing plants to produce rely on weak momentum transfer from photons. Harnessing the energy of photons is a far more powerful

Zettl, Alex

372

Review of Mode-Conversion Calculations in Toroidal Plasmasy  

E-Print Network (OSTI)

Institute of Technology SE-100 44 Stockholm, Sweden y work performed during a visit at CRPP, september 1999 ABSTRACT. Recent developments in the gyrokinetic modeling of drift-, Alfv´en and Bernstein waves allow-hybrid resonances where mode-conversion is possible; the power absorption can however not cor- rectly be determined

Jaun, André

373

Review of ModeConversion Calculations in Toroidal Plasmas y  

E-Print Network (OSTI)

Institute of Technology SE­100 44 Stockholm, Sweden y work performed during a visit at CRPP, september 1999 ABSTRACT. Recent developments in the gyrokinetic modeling of drift­, Alfvâ??en and Bernstein waves allow­hybrid resonances where mode­conversion is possible; the power absorption can however not cor­ rectly be determined

Jaun, André

374

Photovoltaic and photoelectrochemical conversion of solar energy  

Science Journals Connector (OSTI)

...multiple carrier generation...renewable energy|solar energy conversion|photovoltaic...photovoltaic energy conversion process...minority carriers in the p-type...efficiency carrier multiplication...for solar energy conversion. Phys...

2007-01-01T23:59:59.000Z

375

Alternative Fuels Data Center: Vehicle Conversions  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Conversions Conversions Printable Version Share this resource Send a link to Alternative Fuels Data Center: Vehicle Conversions to someone by E-mail Share Alternative Fuels Data Center: Vehicle Conversions on Facebook Tweet about Alternative Fuels Data Center: Vehicle Conversions on Twitter Bookmark Alternative Fuels Data Center: Vehicle Conversions on Google Bookmark Alternative Fuels Data Center: Vehicle Conversions on Delicious Rank Alternative Fuels Data Center: Vehicle Conversions on Digg Find More places to share Alternative Fuels Data Center: Vehicle Conversions on AddThis.com... Vehicle Conversions Photo of converted to run on propane. What kinds of conversions are available? Natural Gas Propane Electric Hybrid Ethanol An aftermarket conversion is a vehicle or engine modified to operate using

376

Alternative Fuels Data Center: Propane Vehicle Conversions  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Conversions to someone by E-mail Conversions to someone by E-mail Share Alternative Fuels Data Center: Propane Vehicle Conversions on Facebook Tweet about Alternative Fuels Data Center: Propane Vehicle Conversions on Twitter Bookmark Alternative Fuels Data Center: Propane Vehicle Conversions on Google Bookmark Alternative Fuels Data Center: Propane Vehicle Conversions on Delicious Rank Alternative Fuels Data Center: Propane Vehicle Conversions on Digg Find More places to share Alternative Fuels Data Center: Propane Vehicle Conversions on AddThis.com... More in this section... Propane Basics Benefits & Considerations Stations Vehicles Availability Conversions Emissions Laws & Incentives Propane Vehicle Conversions Related Information Conversion Basics Regulations Vehicle conversions provide alternative fuel options beyond what is

377

Flow Duration Curve Load Duration Curve  

E-Print Network (OSTI)

and concentration data--select appropriate conversion factors 3. Develop Load Duration Curve 4. Plot observed data there has been no flow at this site #12;Gather daily flow rate data Load data into a spreasheet Sort largest, etc) Calculate percentage of days flow was exceeded: How do you estimate load with given data

378

Chemical Conversions of Natural Precursors  

Science Journals Connector (OSTI)

Many products from the flavour industry are primary products from renewable resources or secondary products obtained by chemical conversions of the primary products. In general these secondary products are key...

Peter H. van der Schaft

2007-01-01T23:59:59.000Z

379

Solar Energy Conversion Efficiency Project  

Science Journals Connector (OSTI)

Report of a discussion on possible collaborative experimentation to test and refine biomass production models based on the conversion of solar energy by plant stands, and to evaluate alternative models.

J. S. Pereira; J. J. Landsberg

1989-01-01T23:59:59.000Z

380

Plasmonic conversion of solar energy  

E-Print Network (OSTI)

Basic Research Needs for Solar Energy Utilization, BasicS. Pillai and M. A. Green, Solar Energy Materials and SolarPlasmonic conversion of solar energy César Clavero Plasma

Clavero, Cesar

2014-01-01T23:59:59.000Z

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


381

Tapping the Power of Alaska's Rivers | Department of Energy  

Office of Environmental Management (EM)

a practical River In-Stream Energy Conversion (RISEC)-a device that can produce electricity from free-flowing rivers not suited to conventional hydroelectric generation, and...

382

Energy Conversion Devices | Open Energy Information  

Open Energy Info (EERE)

Jump to: navigation, search Name: Energy Conversion Devices Place: Rochester Hills, MI Website: http:www.energyconversiondev References: Energy Conversion Devices1...

383

Modeling Energy Recovery Using Thermoelectric Conversion Integrated with an Organic Rankine Bottoming Cycle  

SciTech Connect

Hot engine exhaust represents a resource that is often rejected to the environment without further utilization. This resource is most prevalent in the transportation sector, but stationary engine-generator systems also typically do not utilize this resource. Engine exhaust is a source of high grade thermal energy that can potentially be utilized by various approaches to produce electricity or to drive heating and cooling systems. This paper describes a model system that employs thermoelectric conversion as a topping cycle integrated with an organic Rankine bottoming cycle for waste heat utilization. This approach is being developed to fully utilize the thermal energy contained in hot exhaust streams. The model is composed of a high temperature heat exchanger which extracts thermal energy for driving the thermoelectric conversion elements. However, substantial sensible heat remains in the exhaust stream after emerging from the heat exchanger. The model incorporates a closely integrated bottoming cycle to utilize this remaining thermal energy in the exhaust stream. The model has many interacting parameters that define combined system quantities such as overall output power, efficiency, and total energy utilization factors. In addition, the model identifies a maximum power operating point for the system. That is, the model can identify the optimal amount of heat to remove from the exhaust flow to run through the thermoelectric elements. Removing too much or too little heat from the exhaust stream in this stage will reduce overall cycle performance. The model has been developed such that heat exchanger UAh values, thermal resistances, ZT values, and multiple thermoelectric elements can be investigated in the context of system operation. The model also has the ability to simultaneously determine the effect of each cycle design parameter on the performance of the overall system, thus giving the ability to utilize as much waste heat as possible. Key analysis results are presented showing the impact of critical design parameters on power output, system performance and inter-relationships between design parameters in governing performance.

Miller, Erik W.; Hendricks, Terry J.; Peterson, Richard B.

2009-07-01T23:59:59.000Z

384

Magnet Technology for Power Converters: Nanocomposite Magnet Technology for High Frequency MW-Scale Power Converters  

SciTech Connect

Solar ADEPT Project: CMU is developing a new nanoscale magnetic material that will reduce the size, weight, and cost of utility-scale PV solar power conversion systems that connect directly to the grid. Power converters are required to turn the energy that solar power systems create into useable energy for the grid. The power conversion systems made with CMU’s nanoscale magnetic material have the potential to be 150 times lighter and significantly smaller than conventional power conversion systems that produce similar amounts of power.

None

2012-02-27T23:59:59.000Z

385

Potential Impact of ZT = 4 Thermoelectric Materials on Solar Thermal Energy Conversion Technologies  

Science Journals Connector (OSTI)

Photovoltaic and solar-thermal are two conversion technologies receiving a great deal of attention. ... Solar-thermal conversion uses the full solar spectrum and generates electricity by conventional electromagnetic induction methods. ... Resource and environmental impact considerations will play an increasingly important role in reaching decisions concerning the practicality of thermoelectric power generation systems. ...

Ming Xie; Dieter M. Gruen

2010-03-02T23:59:59.000Z

386

THE CONVERSION OF BIOMASS TO ETHANOL USING GEOTHERMAL ENERGY DERIVED FROM HOT DRY ROCK  

E-Print Network (OSTI)

97505 THE CONVERSION OF BIOMASS TO ETHANOL USING GEOTHERMAL ENERGY DERIVED FROM HOT DRY ROCK between a hot dry rock (HDR) geothermal energy source and the power requirements for the conversion of biomass to fuel ethanol is considerable. In addition, combining these two renewable energy resources

387

Mediator-free solar energy conversion by the artificially installed thylakoid membrane on the functionalized electrode  

Science Journals Connector (OSTI)

Abstract Here we report an effective solar energy conversion using a whole thylakoid membrane chemically installed on the anthraquinone-modified glassy carbon (GC) electrode. A mixed monolayer of anthraquinone and carboxyphenyl on the GC surface was formed prior to the thylakoid bioconjugation via reductive C–C coupling. Thus prepared electrodes showed higher photocurrent than those without an anthraquinone layer. Two main electron transfer pathways have been identified from the blocking experiments with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), an inhibitor of QB site in photosystem II (PSII) and with paraquat, a possible electron acceptor of FA/FB site in photosystem I (PSI). 41% photocurrent follows the normal electron transfer pathway from FA/FB to the electrode via anthraquinone. The remaining 59% directly flows from QA (or QB) to the electrode also via anthraquinone. From the complete solar cell that was constructed in combination with an oxygen reduction cathode, the maximum power density of 0.27 ?W/cm2 with current density of 0.63 ?A/cm2 under one sun illumination was obtained. The turnover frequency was calculated to be 10 water molecule oxidation per PSII unit per second, indicating that the thylakoid membrane on the surface maintained its activity. This work provides a simple and reliable method to photoenergy conversion using thylakoid membranes.

Jinhwan Lee; Sunghyun Kim

2014-01-01T23:59:59.000Z

388

The Application of Frequency-Conversion Technology in Groundwater Source Heat Pump System Reconstruction  

E-Print Network (OSTI)

Deep well pump power is relatively ubiquitous in the groundwater heat pump air-conditioning system in some hotels in Hunan, and the heat pump usually meets the change of the load by throttling. Therefore, frequency conversion technology is proposed...

Dai, X.; Song, S.

2006-01-01T23:59:59.000Z

389

E-Print Network 3.0 - all-optical wavelength conversion Sample...  

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

Search Powered by Explorit Topic List Advanced Search Sample search results for: all-optical wavelength conversion Page: << < 1 2 3 4 5 > >> 1 Bitwise-controlled All-Optical...

390

Quantum-coupled single-electron thermal to electric conversion scheme  

E-Print Network (OSTI)

Thermal to electric energy conversion with thermophotovoltaics relies on radiation emitted by a hot body, which limits the power per unit area to that of a blackbody. Microgap thermophotovoltaics take advantage of evanescent ...

Wu, D. M.

391

PowerPoint Presentation  

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

2 QUENCH TESTS 2 QUENCH TESTS 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 0 5 10 15 20 25 QUENCH NUMBER QUENCH CURRENT (A) Right Upper (Forced Flow) Right Upper (Liquid) Left Upper (Forced Flow) Left Lower (Forced Flow) No Quench (Forced Flow) No Quench (Liquid) Thermal Cycle 7 TeV (5700A) 7.56 TeV (6300A) WBT CLOSED Only left magnet powered Power & Flow Right Only WBT Open LIQUID WBT CLOSED FORCED FLOW Power & Flow Left Only 18-Feb-2005 J. F. Muratore Brookhaven National Lab D3L102 QUENCH SUMMARY Magcool Bay C ________________________________________________________________________________ QUENCH RUN CURRENT T2 T3 START MIITS COIL COMMENTS # # (A) (K) (K) (ms)

392

Design study of a coal-fired thermionic (THX) topped power plant. Volume IV. Thermionic heat exchanger design and costing  

SciTech Connect

This volume deals with the details of how thermionic conversion works, and how it is used in a coal-fired furnace to achieve power plant efficiencies of 45%, and overall costs of 36.3 mills/kWh. A review of the fundamental technical aspects of thermionic conversion is given. The overall Thermionic Heat Exchanger (THX) design, the heat pipe design, and the interaction of the heat pipes with the furnace are presented. Also, the operational characteristics of thermionic converters are described. Details on the computer program used to perform the parametric study are given. The overall program flow is reviewed along with the specifics of how the THX subroutine designed the converter to match the conditions imposed. Also, input costs and variables effecting the THX's performance are detailed. The efficiencies of the various power plants studied are given as a function of the air preheat temperature, size of the power plant, and thermionic level of performance.

Dick, R.S.; Britt, E.J.

1980-10-15T23:59:59.000Z

393

Proceedings of the sixth international conference on thermoelectric energy conversion  

SciTech Connect

This book presents the papers given at a conference on thermoelectric energy conversion. Topics considered at the conference included thermoelectric materials, the computer calculation of thermoelectric properties, the performance of crss-flow thermoelectric liquid coolers, thermoelectric cooler performance corrections for soft heat sinks, heat exchange in a thermoelectric cooling system, the optimal efficiency of a solar pond and thermoelectric generator system, and thermoelectric generation utilizing industrial waste heat as an energy source.

Rao, K.R.

1986-01-01T23:59:59.000Z

394

Ocean Power Technologies (TRL 5 6 System) - PB500, 500 kW Utility...  

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

technologiesinchart.ppt More Documents & Publications Advanced, High Power, Next Scale, Wave Energy Conversion Device Ocean Power Technologies (TRL 7 8 System) - Reedsport PB150...

395

E-Print Network 3.0 - american electric power Sample Search Results  

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

and no claims about this ... Source: US DOE, Office of Energy Efficiency and Renewable Energy, Green Power Network Collection: Energy Storage, Conversion and Utilization ; Power...

396

Conversion Electrons of Radium D  

Science Journals Connector (OSTI)

The conversion electrons of radium D have been studied with thin sources on thin backings in a beta-ray spectrograph using calibrated photographic emulsions. The number of conversion electrons due to the 47-kev gamma-ray has been measured to be 74±5 per hundred disintegrations. The L:M:N ratio is 1:0.26:0.077. This implies a complex decay scheme for radium D, since earlier results give 3.5 unconverted 47-kev gamma-rays per hundred disintegrations.

Lawrence Cranberg

1950-01-15T23:59:59.000Z

397

Recirculation in multiple wave conversions  

SciTech Connect

A one-dimensional multiple wave-conversion model is constructed that allows energy recirculation in ray phase space. Using a modular eikonal approach, the connection coefficients for this model are calculated by ray phase-space methods. Analytical results (confirmed numerically) show that all connection coefficients exhibit interference effects that depend on an interference phase, calculated from the coupling constants and the area enclosed by the intersecting rays. This conceptual model, which focuses on the topology of intersecting rays in phase space, is used to investigate how mode conversion between primary and secondary waves is modified by the presence of a tertiary wave.

Kaufman, A. N.; Brizard, A.J.; Kaufman, A.N.; Tracy, E.R.

2008-07-30T23:59:59.000Z

398

August 17, 2000 ARIES: Fusion Power Core and Power Cycle Engineering/ARR 1  

E-Print Network (OSTI)

translates in lower COE and lower heat load · Brayton cycle is best near-term possibility of power conversion heat generation profiles used for thermal-hydraulic analyses #12;August 17, 2000 ARIES: Fusion PowerAugust 17, 2000 ARIES: Fusion Power Core and Power Cycle Engineering/ARR 1 ARIES: Fusion Power Core

Raffray, A. René

399

Instream Flow Project  

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

As a part of the Department of Energy’s Water Power Program, the Instream Flow Project was carried out by Oak Ridge National Laboratory, Pacific Northwest National Laboratory, and Argonne National Laboratory to develop tools aimed at defining environmental flow needs for hydropower operations.

400

Paducah DUF6 Conversion Final EIS - Notation  

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

Paducah DUF Paducah DUF 6 Conversion Final EIS xxv NOTATION The following is a list of acronyms and abbreviations, chemical names, and units of measure used in this document. Some acronyms used only in tables may be defined only in those tables. GENERAL ACRONYMS AND ABBREVIATIONS AEA Atomic Energy Act of 1954 AEC U.S. Atomic Energy Commission AIHA American Industrial Hygiene Association ALARA as low as reasonably achievable ANL Argonne National Laboratory ANP Advanced Nuclear Power (Framatone ANP, Inc.) ANSI American National Standards Institute AQCR Air Quality Control Region BLS Bureau of Labor Statistics CAA Clean Air Act CEQ Council on Environmental Quality CERCLA Comprehensive Environmental Response, Compensation, and Liability Act of 1980 CFR Code of Federal Regulations CRMP cultural resource management plan

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


401

Chapter 24 - Fuel Cells: Energy Conversion Technology  

Science Journals Connector (OSTI)

The drive for fuel cell technology research and development stems from cleanliness of the technology, high chemical to electrical conversion efficiency and versatile applications ranging from large-scale, stand-alone stationary power plant to modular distributed generation systems to advanced mobile auxiliary power units. Portable systems and those that can be carried are also currently being designed for civilian and military markets. Fuel cells are capable of generating electricity with virtually negligible to zero pollution (e.g. SOx, NOx, volatile organic compounds (VOC), particulate matters (PMs)). They also offer a reduced carbon footprint and have the potential to be engineered for ‘zero carbon’ systems. Despite the potential to meet the pressing needs for clean and efficient fuel cell–based power generation systems, high capital and maintenance cost remains a challenge for large-scale commercialisation and global market entry. Solid oxide fuel cell (SOFC) is one of the most promising fuel cell technologies as it offers significantly higher electrical efficiency as well as co-production of high-quality process heat. The system lifetime, its reliability and cost, however, remain a concern due to the performance degradation with time, commonly associated with the instability of materials in complex operating environment and high exposure temperature (650–1000)°C. New materials, systems design and operating conditions are being developed to increase the lifetime. Centralised and distributed SOFC power systems in the range of hundreds of kilowatt to megawatt are being considered for integration with advanced coal power plants, hybrid systems integrated with energy storage and carbon-capture technologies to fully exploit the commercial potential.

Manoj K. Mahapatra; Prabhakar Singh

2014-01-01T23:59:59.000Z

402

Limits to power system growth  

SciTech Connect

In the design of space nuclear power systems a variety of conversion techniques may be used, each with its own advantages and disadvantages. A study was performed which analyzed over 120 proposed system designs. The designs were compared to identify the optimum conversion system as a function of power level and find limits to specific mass (kg/kWe) for each power cycle. Furthermore, the component masses were studied to determine which component of the overall design contributes the most to total system mass over a variety of power levels. The results can provide a focus for future research efforts by selecting the best conversion technology for the desired power range, and optimizing the system component which contributes most to the total mass.

Slater, S.M.; Klein, A.C. (Department of Nuclear Engineering, Oregon State University, Corvallis, Oregon 97331 (United States)); Webb, B.J. (Umpqua Research, Inc., P.O. Box 791, Myrtle Creek, Oregon 97457 (United States)); Pauley, K.A. (Battelle Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352 (United States))

1993-01-15T23:59:59.000Z

403

Power beaming providing a space power infrastructure  

SciTech Connect

This study, based on two levels of technology, applies the power beaming concept to four planned satellite constellations. The analysis shows that with currently available technology, power beaming can provide mass savings to constellations in orbits ranging from low earth orbit to geosynchronous orbit. Two constellations, space surveillance and tracking system and space based radar, can be supported with current technology. The other two constellations, space-based laser array and boost surveillance and tracking system, will require power and transmission system improvements before their breakeven specific mass is achieved. A doubling of SP-100 conversion efficiency from 10 to 20/% would meet or exceed breakeven for these constellations.

Bamberger, J.A.; Coomes, E.P.

1992-08-01T23:59:59.000Z

404

MUTUAL CONVERSION SOLAR AND SIDEREAL  

E-Print Network (OSTI)

TABLES FOR THE MUTUAL CONVERSION OF SOLAR AND SIDEREAL TIME BY EDWARD SANG, F.R.S.E. EDINBURGH in the third example. Sang converts 3.27 seconds of solar time into 3.26 seconds of sidereal time. But sidereal time elapses faster than solar time, and the correct value is 3.28 sec- onds. In the fourth example

Roegel, Denis

405

HELIOPHYSICS II. ENERGY CONVERSION PROCESSES  

E-Print Network (OSTI)

of a solar flare 11 2.3.1 Flare luminosity and mechanical energy 11 2.3.2 The impulsive phase (hard X with the term "solar flare" dominate our thinking about energy conversion from magnetic storage to other forms approaches to the problems involved in phys- ically characterizing the solar atmosphere; see also the lecture

Hudson, Hugh

406

Alternative Fuels Data Center: Vehicle Conversion Basics  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Vehicle Conversion Vehicle Conversion Basics to someone by E-mail Share Alternative Fuels Data Center: Vehicle Conversion Basics on Facebook Tweet about Alternative Fuels Data Center: Vehicle Conversion Basics on Twitter Bookmark Alternative Fuels Data Center: Vehicle Conversion Basics on Google Bookmark Alternative Fuels Data Center: Vehicle Conversion Basics on Delicious Rank Alternative Fuels Data Center: Vehicle Conversion Basics on Digg Find More places to share Alternative Fuels Data Center: Vehicle Conversion Basics on AddThis.com... Vehicle Conversion Basics Photo of a Ford Transit Connect converted to run on compressed natural gas. A Ford Transit Connect converted to run on compressed natural gas. A converted vehicle or engine is one modified to use a different fuel or

407

Validation Studies for Numerical Simulations of Flow Phenomena Expected in the Lower Plenum of a Prismatic VHTR Reference Design  

SciTech Connect

The final design of the very high temperature reactor (VHTR) of the fourth generation of nuclear power plants (Gen IV) has not yet been established. The VHTR may be either a prismatic (block) or pebble bed type. It may be either gas-cooled or cooled with an as yet unspecified molten salt. However, a conceptual design of a gas-cooled VHTR, based on the General Atomics GT-MHR, does exist and is called the prismatic VHTR reference design, MacDonald et al [2003], General Atomics [1996]. The present validation studies are based on the prismatic VHTR reference design. In the prismatic VHTR reference design, the flow in the lower plenum will be introduced by dozens of turbulent jets issuing into a large crossflow that must negotiate dozens of cylindrical support columns as it flows toward the exit duct of the reactor vessel. The jets will not all be at the same temperature due to the radial variation of power density expected in the core. However, it is important that the coolant be well mixed when it enters the power conversion unit to ensure proper operation and long life of the power conversion machinery. Hence, it is deemed important to be able to accurately model the flow and mixing of the variable temperature coolant in the lower plenum and exit duct. Accurate flow modeling involves determining modeling strategies including the fineness of the grid needed, iterative convergence tolerance, numerical discretization method used, whether the flow is steady or unsteady, and the turbulence model and wall treatment employed. It also involves validation of the computer code and turbulence model against a series of separate and combined flow phenomena and selection of the data used for the validation. The present report describes progress made to date for the task entitled ‘CFD software validation of jets in crossflow’ which was designed to investigate the issues pertaining to the validation process.

Richard W. Johnson

2005-09-01T23:59:59.000Z

408

Performance measurements of cylindrical- and spherical-helical cross-flow marine hydrokinetic turbines, with estimates of exergy efficiency  

Science Journals Connector (OSTI)

Abstract Power and drag (or thrust) measurements were performed in a towing tank for two different helical cross-flow marine hydrokinetic energy conversion devices—a cylindrical Gorlov Helical Turbine (GHT) and a Lucid Spherical Turbine (LST). The turbines are compared with respect to their various design parameters, with the GHT overall operating at higher power and drag coefficients. An estimate for the exergy efficiency of a turbine in free flow is formulated using momentum theory, and this quantity is computed for both devices. The GHT's exergy efficiency advantage over the LST was higher than that based on the power coefficient. Momentum theory-based blockage corrections were applied to the measurements and compared with the non-corrected data. The results presented here will help increase the amount of experimental data for helical devices in the literature, which is necessary for the development of more accurate engineering tools that take into account the unique three-dimensional nature of these devices.

Peter Bachant; Martin Wosnik

2015-01-01T23:59:59.000Z

409

Single-stage conversion of associated petroleum gas and natural gas to syngas in combustion and auto-ignition processes  

Science Journals Connector (OSTI)

Single-stage conversion of alkane mixtures simulating associated petroleum gas (APG) to syngas is studied in a static installation and ... in a flow reactor based on the rocket combustion chamber. Yields of the d...

Yu. A. Kolbanovskii; I. V. Bilera; I. V. Rossikhin…

2011-12-01T23:59:59.000Z

410

Conversion | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure...

411

Efficiency Improvement in an Over the Road Diesel Powered Engine...  

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

and potential efficiency enhancement deer08schock.pdf More Documents & Publications Thermoelectric Conversion of Waste Heat to Electricity in an IC Engine Powered Vehicle...

412

Enthusiasm for UK wave power survives high costs  

Science Journals Connector (OSTI)

... drive a turbine. But other proposals include on site conversion to hydrogen, on site desalination or direct use of the mechanical power to make heat.

Joe Schwartz

1978-11-30T23:59:59.000Z

413

Thermophotovoltaics : shaping the flow of thermal radiation  

E-Print Network (OSTI)

This thesis explores the modeling, design, and optimization of photonic crystals as spectral control components for high-performance thermophotovoltaic (TPV) power conversion. In particular, we focus on the use of ...

?elanovi?, Ivan

2006-01-01T23:59:59.000Z

414

MHK Technologies/PowerGin | Open Energy Information  

Open Energy Info (EERE)

PowerGin PowerGin < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage PowerGin.jpg Technology Profile Primary Organization Kinetic Wave Power Technology Resource Click here Wave Technology Type Click here Overtopping Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description The energy conversion rate of the PowerGin is 20 30 The PowerGin makes use of both vertical and horizontal energy which allows the device to operate effectively in low wave states Buckets are mounted in a dense spiral pattern around the perimeter similar to hydro electric turbine blades which provide a high surface area to catch wave energy As the buckets on the ramp side of the rotor fill with wave water the rotors begin to turn Water is emptied out of the bucket instantaneously when it is submerged under the water by a patented gravity driven flap on the bottom The flap slams shut in one direction and opens in the other The two rotors rotate in opposite directions which maintain balance and continuous rotary power flow

415

Photovoltaic and photoelectrochemical conversion of solar energy  

Science Journals Connector (OSTI)

...photoelectrochemical conversion of solar energy Michael Gratzel * * ( michael...industry, have dominated photovoltaic solar energy converters. These systems have...promising perspectives. renewable energy|solar energy conversion|photovoltaic...

2007-01-01T23:59:59.000Z

416

Grounded Situation Models for Situated Conversational Assistants  

E-Print Network (OSTI)

A Situated Conversational Assistant (SCA) is a system with sensing, acting and speech synthesis/recognition abilities, which engages in physically situated natural language conversation with human partners and assists them ...

Mavridis, Nikolaos

2007-01-01T23:59:59.000Z

417

Biofuel Conversion Basics | Department of Energy  

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

Biofuel Conversion Basics Biofuel Conversion Basics Biofuel Conversion Basics August 14, 2013 - 12:31pm Addthis The conversion of biomass solids into liquid or gaseous biofuels is a complex process. Today, the most common conversion processes are biochemical- and thermochemical-based. However, researchers are also exploring photobiological conversion processes. Biochemical Conversion Processes In biochemical conversion processes, enzymes and microorganisms are used as biocatalysts to convert biomass or biomass-derived compounds into desirable products. Cellulase and hemicellulase enzymes break down the carbohydrate fractions of biomass to five- and six-carbon sugars in a process known as hydrolysis. Yeast and bacteria then ferment the sugars into products such as ethanol. Biotechnology advances are expected to lead to dramatic

418

Photochemical conversion and storage of solar energy  

Science Journals Connector (OSTI)

Photochemical conversion and storage of solar energy ... In this article, the author considers the use of inorganic photochemical reactions for the conversion and storage of solar energy. ... HOMO?LUMO energy difference values compared ... ...

Charles Kutal

1983-01-01T23:59:59.000Z

419

The National Conversion Pilot Project  

SciTech Connect

The National Conversion Pilot Project (NCPP) is a recycling project under way at the U.S. Department of Energy (DOE) Rocky Flats Environmental Technology Site (RFETS) in Colorado. The recycling aim of the project is threefold: to reuse existing nuclear weapon component production facilities for the production of commercially marketable products, to reuse existing material (uranium, beryllium, and radioactively contaminated scrap metals) for the production of these products, and to reemploy former Rocky Flats workers in this process.

Roberts, A.V. [BNFL, Inc., Golden, CO (United States)

1995-12-31T23:59:59.000Z

420

Methanol conversion to higher hydrocarbons  

SciTech Connect

Several indirect options exist for producing chemicals and transportation fuels from coal, natural gas, or biomass. All involve an initial conversion step to synthesis gas (CO and H{sub 2}). Presently, there are two commercial technologies for converting syngas to liquids: Fischer-Tropsch, which yields a range of aliphatic hydrocarbons with molecular weights determined by Schulz-Flory kinetics, and methanol synthesis. Mobil`s diversity of technology for methanol conversion gives the methanol synthesis route flexibility for production of either gasoline, distillate or chemicals. Mobil`s ZSM-5 catalyst is the key in several processes for producing chemicals and transportation fuels from methanol: MTO for light olefins, MTG for gasoline, MOGD for distillates. The MTG process has been commercialized in New Zealand since 1985, producing one-third of the country`s gasoline supply, while MTO and MOGD have been developed and demonstrated at greater than 100 BPD scale. This paper will discuss recent work in understanding methanol conversion chemistry and the various options for its use.

Tabak, S.A. [Mobil Research and Development Corp., Princeton, NJ (United States). Central Research Lab.

1994-12-31T23:59:59.000Z

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


421

E-Print Network 3.0 - applying dynamic flow-density Sample Search...  

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

Collection: Energy Storage, Conversion and Utilization 17 Dynamic Origin-Destination Demand Flow Estimation under Congested Traffic Conditions Xuesong Zhou Summary: for the...

422

E-Print Network 3.0 - air flow maldistribution Sample Search...  

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

Engine Center Collection: Engineering ; Energy Storage, Conversion and Utilization 3 Measurement of flow maldistribution in parallel channels and its application to ex-situ and...

423

Conversion of Solar to Electrical Energy  

Science Journals Connector (OSTI)

A photovoltaic device has been developed which converts solar radiation directly into electrical energy with an over-all efficiency of 11%. This consists of a p-n junction formed by gaseous diffusion near the front surface of a silicon plate. In full sunlight a single cell furnishes approximately 30 ma of short circuit current per square centimeter of surface 0.6 v of open circuit voltage and 12 mw of power into a matched load per square centimeter of surface. Like other electric batteries individual cells may be connected in series or parallel to obtain an increase in terminal voltage or current. The spectral response is a maximum near 0.7 µ and the long wavelength cutoff is at approximately 1.1 µ. The efficiency of this new siliconp-n junctionphotovoltaic cell is greater by a factor of 20 than that previously reported for other types of photocells and makes the conversion of the sun's energy directly into electricity possible for a number of interesting applications. A Bell System field trial at Americus Georgia in which solar batteries are used to power a rural carrier telephone communication system is described. A number of other possible applications for this new solar energy converter are discussed.

G. L. Pearson

1957-01-01T23:59:59.000Z

424

Proceedings of the 31. intersociety energy conversion engineering conference. Volume 2: Conversion technologies, electro-chemical technologies, Stirling engines, thermal management  

SciTech Connect

The 148 papers contained in Volume 2 are arranged topically as follows -- (A) Conversion Technologies: Superconductivity applications; Advanced cycles; Heat engines; Heat pumps; Combustion and cogeneration; Advanced nuclear reactors; Fusion Power reactors; Magnetohydrodynamics; Alkali metal thermal to electric conversion; Thermoelectrics; Thermionic conversion; Thermophotovoltaics; Advances in electric machinery; and Sorption technologies; (B) Electrochemical Technologies: Terrestrial fuel cell technology; and Batteries for terrestrial power; (C) Stirling Engines: Stirling machine analysis; Stirling machine development and testing; and Stirling component analysis and testing; (D) Thermal Management: Cryogenic heat transfer; Electronic components and power systems; Environmental control systems; Heat pipes; Numeric analysis and code verification; and Two phase heat and mass transfer. Papers within the scope of the data base have been processed separately.

Chetty, P.R.K.; Jackson, W.D.; Dicks, E.B. [eds.

1996-12-31T23:59:59.000Z

425

Power inverters  

DOE Patents (OSTI)

Power inverters include a frame and a power module. The frame has a sidewall including an opening and defining a fluid passageway. The power module is coupled to the frame over the opening and includes a substrate, die, and an encasement. The substrate includes a first side, a second side, a center, an outer periphery, and an outer edge, and the first side of the substrate comprises a first outer layer including a metal material. The die are positioned in the substrate center and are coupled to the substrate first side. The encasement is molded over the outer periphery on the substrate first side, the substrate second side, and the substrate outer edge and around the die. The encasement, coupled to the substrate, forms a seal with the metal material. The second side of the substrate is positioned to directly contact a fluid flowing through the fluid passageway.

Miller, David H. (Redondo Beach, CA); Korich, Mark D. (Chino Hills, CA); Smith, Gregory S. (Woodland Hills, CA)

2011-11-15T23:59:59.000Z

426

3. Energy conversion, balances, efficiency, equilibrium  

E-Print Network (OSTI)

1/124 3. Energy conversion, balances, efficiency, equilibrium (Introduction to Thermodynamics) Ron h�dm, h = u + p/ Picture: SEHB06 56/124 3.5: Energy balances; Conversion work work, work heat 96/124 Energy conversion heat work /1 "the essential rules" Picture:IO06 #12;97/124 Energy

Zevenhoven, Ron

427

Energy Conversion Technologies 1.0 Introduction  

E-Print Network (OSTI)

1 Energy Conversion Technologies 1.0 Introduction In these notes, we describe the infrastructure. By "energy conversion," we mean the conversion of energy into some form of electric energy. By "available now that is available to be considered in the generation and planning functions. We classify this information by Energy

McCalley, James D.

428

GUIDED ANGLER FISH ANNUAL CONVERSION FACTORS  

E-Print Network (OSTI)

GUIDED ANGLER FISH ANNUAL CONVERSION FACTORS FOR THE 2014 FISHING YEAR NOAA FISHERIES, ALASKA via the GAF electronic reporting system. If no GAF were harvested in a year, the conversion factor is the first calendar year that GAF regulations will be in effect. Therefore, the conversion factors are based

429

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 4, NOVEMBER 2001 935 Discussion of "A Physical-Flow-Based Approach to  

E-Print Network (OSTI)

to Allocating Transmission Losses in a Transaction Framework" George Gross and Shu Tao The authors are grateful, England. Publisher Item Identifier S 0885-8950(01)09812-1. 1G. Gross and S. Fao, IEEE Trans. Power Systems

Gross, George

430

Coordinated optimization of the parameters of the cooled gas-turbine flow path and the parameters of gas-turbine cycles and combined-cycle power plants  

Science Journals Connector (OSTI)

In the present paper, we evaluate the effectiveness of the coordinated solution to the optimization problem for the parameters of cycles in gas turbine and combined cycle power plants and to the optimization prob...

A. M. Kler; Yu. B. Zakharov; Yu. M. Potanina

2014-06-01T23:59:59.000Z

431

To cite this version : Rigo-Mariani, Rmy and Sareni, Bruno and Roboam, Xavier Fast Power Flow Scheduling and Sensitivity Analysis for Sizing a  

E-Print Network (OSTI)

programming 1. INTRODUCT ON With the growing number of renewable energy sources the power grid topology has in the association of ten high-speed flywheels is also introduced. The strategy chosen to manage the overall system

Mailhes, Corinne

432

Ionic Liquids as Solvents for Catalytic Conversion of Lignocellulosic Feedstocks  

E-Print Network (OSTI)

to the development of biomass conversion technologies, it isefficient and selective biomass conversion technologies is athe conversion of both carbohydrate components of biomass.

Dee, Sean Joseph

2012-01-01T23:59:59.000Z

433

OCEAN THERMAL ENERGY CONVERSION: AN OVERALL ENVIRONMENTAL ASSESSMENT  

E-Print Network (OSTI)

1980. Ocean Thermal Energy Conversion Draft ProgrammaticPlan. Ocean Thermal Energy Conversion. U.S. DOE Assistantl OCEAN THERMAL ENERGY CONVERSION: ENVIRONMENTAL ASSESSMENT

Sands, M.Dale

2013-01-01T23:59:59.000Z

434

Semiconductor nanowires for photovoltaic and photoelectrochemical energy conversion  

E-Print Network (OSTI)

cost and improve the energy conversion efficiency, to enableefficiency solar energy conversion devices. AcknowledgementsPhotoelectrochemical Energy Conversion Neil P. Dasgupta and

Dasgupta, Neil

2014-01-01T23:59:59.000Z

435

Explorations of Novel Energy Conversion and Storage Systems  

E-Print Network (OSTI)

of Steady-State Energy Conversion. Applied ScientificElectrokinetic energy conversion efficiency in nanofluidicElectrokinetic energy conversion efficiency in nanofluidic

Duffin, Andrew Mark

2010-01-01T23:59:59.000Z

436

OCEAN THERMAL ENERGY CONVERSION (OTEC) PROGRAMMATIC ENVIRONMENTAL ANALYSIS  

E-Print Network (OSTI)

of ocean thermal energy conversion technology. U.S. DOE.ocean thermal energy conversion. A preliminary engineeringCompany. Ocean thermal energy conversion mission analysis

Sands, M. D.

2011-01-01T23:59:59.000Z

437

ENVIRONMENTAL ASSESSMENT OCEAN THERMAL ENERGY CONVERSION (OTEC) PILOT PLANTS  

E-Print Network (OSTI)

Commercial ocean thermal energy conversion (OTEC) plants byFifth Ocean Thermal Energy Conversion Conference, February1980. Ocean thermal energy conversion (OTEC) pilot plant

Sullivan, S.M.

2014-01-01T23:59:59.000Z

438

DRAFT. ENVIRONMENTAL ASSESSMENT OCEAN THERMAL ENERGY CONVERSION (OTEC) PILOT PLANTS  

E-Print Network (OSTI)

Commercial ocean thermal energy conversion ( OTEC) plants byfield of ocean thermal energy conversion discharges. I~. L.Sixth Ocean Thermal Energy conversion Conference. June 19-

Sullivan, S.M.

2014-01-01T23:59:59.000Z

439

Recycling of wasted energy : thermal to electrical energy conversion  

E-Print Network (OSTI)

Nanoporous Thermal-to-Electrical Energy Conversion System (of Wasted Energy : Thermal to Electrical Energy Conversion AArticles: 1. “ Thermal to electrical energy conversion” , Yu

Lim, Hyuck

2011-01-01T23:59:59.000Z

440

2008 Guidelines to Defra's GHG Conversion Factors Guidelines to Defra's GHG Conversion Factors  

E-Print Network (OSTI)

with the standard conversion factors at Annex 1. If, however, you export energy or heat to another business (or2008 Guidelines to Defra's GHG Conversion Factors 2008 Guidelines to Defra's GHG Conversion Factors yellow = Calculation results Page 1 of 15 #12;2008 Guidelines to Defra's GHG Conversion Factors Annex 1

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


441

Sandia National Laboratories: Thermochemical Conversion  

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

Engine Test Facility Central Receiver Test Facility Power Towers for Utilities Solar Furnace Dish Test Facility Optics Lab Parabolic Dishes Work For Others (WFO) User...

442

Static power conversion techniques for unique energy devices  

E-Print Network (OSTI)

is an important new energy storage device that has some properties of a battery and a capacitor allowing it to be used in applications where attributes of both are needed. To realize the full potential of these energy sources, novel engineering strategies have...

Welch, Richard Andrew

1998-01-01T23:59:59.000Z

443

Automotive Waste Heat Conversion to Power Program | Department...  

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

1 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and Peer Evaluation ace051lagrandeur2011o.pdf More Documents & Publications...

444

Resistance Compression Networks for Radio-Frequency Power Conversion  

E-Print Network (OSTI)

A limitation of many high-frequency resonant inverter topologies is their high sensitivity to loading conditions. This paper introduces a new class of matching networks that greatly reduces the load sensitivity of resonant ...

Han, Yehui

445

Mesofluidic magnetohydrodynamic power generation  

E-Print Network (OSTI)

Much of the previous research into magnetohydrodynamics has involved large-scale systems. This thesis explores the miniaturization and use of devices to convert the power dissipated within an expanding gas flow into ...

Fucetola, Jay J

2012-01-01T23:59:59.000Z

446

NREL: Biomass Research - Biochemical Conversion Capabilities  

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

Biochemical Conversion Capabilities Biochemical Conversion Capabilities NREL researchers are working to improve the efficiency and economics of the biochemical conversion process by focusing on the most challenging steps in the process. Biochemical conversion of biomass to biofuels involves three basic steps: Converting biomass to sugar or other fermentation feedstock through: Pretreatment Conditioning and enzymatic hydrolysis Enzyme development. Fermenting these biomass-derived feedstocks using: Microorganisms for fermentation. Processing the fermentation product to produce fuel-grade ethanol and other fuels, chemicals, heat, and electricity by: Integrating the bioprocess. Get the Adobe Flash Player to see this video. This video is a narrated animation that explains the biochemical conversion

447

One-dimensional full wave simulation on XB mode conversion in electron cyclotron heating  

SciTech Connect

The XB mode conversion in electron cyclotron resonance frequency heating has been studied in detail through 1D full wave simulation. The field pattern depends on the density scale length, and the wave absorption near upper hybrid resonance is maximized beyond the R(X) mode cutoff density for optimized density scale length. The simulated mode conversion efficiency has been compared with that of an analytic formula, showing good agreements except for the phase dependent term of the X wave. The mode conversion efficiency is calculated for oblique injections as well, and it is found that the efficiency decreases as the injection angles increases. Short magnetic field scale length is confirmed to relax the short density scale length condition maximizing the XB mode conversion efficiency. Finally, the simulation code is used to analyze the mode conversion and power absorption of a pre-ionization plasma in versatile experiment spherical torus.

Kim, S. H., E-mail: shkim95@kaeri.re.kr [Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of); Lee, H. Y.; Jo, J. G.; Hwang, Y. S. [Seoul National University, Seoul 151-742 (Korea, Republic of)

2014-06-15T23:59:59.000Z

448

Most Viewed Documents - Energy Storage, Conversion, and Utilization | OSTI,  

Office of Scientific and Technical Information (OSTI)

Most Viewed Documents - Energy Storage, Conversion, and Utilization Most Viewed Documents - Energy Storage, Conversion, and Utilization Process Equipment Cost Estimation, Final Report H.P. Loh; Jennifer Lyons; Charles W. White, III (2002) Continuously variable transmissions: theory and practice Beachley, N.H.; Frank, A.A. () Review of air flow measurement techniques McWilliams, Jennifer (2002) Building a secondary containment system Broder, M.F. (1994) Cost benefit analysis of the night-time ventilative cooling in office building Seppanen, Olli; Fisk, William J.; Faulkner, David (2003) Evaluation of the 2007 Toyota Camry Hybrid Syneregy Drive System Burress, T.A.; Coomer, C.L.; Campbell, S.L.; et al. (2008) Nanofluid technology : current status and future research. Choi, S. U.-S. (1998) An Improved Method of Manufacturing Corrugated Boxes: Lateral

449

Updated perspective on the potential for thermionic conversion to meet 21. century energy needs  

SciTech Connect

Thermionic conversion is unique among power conversion approaches in its ability to generate power efficiently with high temperature heat rejection. This feature has made thermionics an attractive choice for space power systems; and it has substantial potential for terrestrial advanced energy conversion, if certain recently identified technological developments are realized in a low cost manner. Thermionic energy converters are well suited to a modular approach. Thermionics is a passive system without moving parts. Thermionic energy conversion is able to use heat at the highest temperatures available, and to reject waste heat at temperatures high enough to be efficiently used by other energy conversion systems. For example, a thermionic converter can utilize heat at a high temperature from a flame or other heat source, convert some of it to electricity, and deliver its waste heat at a temperature high enough to run a steam generator. The combination of the thermionic converter and steam generator could produce as much as 40% more electricity from the fuel than the steam generator alone. Other terrestrial applications include cogeneration and a possible power source for a hybrid, low-emission electric vehicle. These terrestrial applications require advances in efficiency and power density in order to operate with lower emitter temperatures than space power thermionic systems. Recently it has been shown that close spaced thermionic converters can achieve the performance goals necessary to meet these attractive new applications. The paper addresses the progress in this regard and describes approaches for engineering practical closed spaced converters for large scale applications. Clearly the potential for thermionic energy conversion is great. Every effort must now be made to use this technology to help solve the world`s energy problems. Investments in the manufacturing infrastructure necessary to make thermionic energy conversion cost effective are needed to reach this goal.

Fitzpatrick, G.O.; Britt, E.J.; Moyzhes, B. [Space Power, Inc., San Jose, CA (United States)

1997-12-31T23:59:59.000Z

450

Abstract--In doubly fed induction generator (DFIG) based wind energy conversion systems (WECS), the DFIG is interfaced to the  

E-Print Network (OSTI)

a popular candidate in the wind energy conversion systems (WECS) due to its advantages [2-5]. When compared with fixed-speed induction generators, the DFIG has the advantages of maximum power capture, less mechanicalAbstract--In doubly fed induction generator (DFIG) based wind energy conversion systems (WECS

Pota, Himanshu Roy

451

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 22, NO. 2, JUNE 2007 431 Control Methodology to Mitigate the Grid Impact  

E-Print Network (OSTI)

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 22, NO. 2, JUNE 2007 431 Control Methodology- energy conversion systems to the generation mix are planned. Compliance with new grid codes [1 and explore the associ- ated tradeoffs. Index Terms--Dynamics, energy storage, power-generation con- trol

Lehn, Peter W.

452

Investigation of ion cyclotron range of frequencies mode conversion at the ionion hybrid layer in Alcator C-Moda...  

E-Print Network (OSTI)

recent results from high power ion cyclotron range of frequencies ICRF heating experiments in the Alcator plasmas. In tokamak experiments with ion cyclotron range of frequencies ICRF heating, the mode conversionInvestigation of ion cyclotron range of frequencies mode conversion at the ion­ion hybrid layer

Basse, Nils Plesner

453

Efficient Power System State Estimation  

E-Print Network (OSTI)

measure the data from the system components such as transmission line power flows, bus power injections monitoring of power systems. 2. Background Power systems have four main components: transmission, sub-transmission failure or generator outages. In the normal insecure state, a system may not be able to handle

Lavaei, Javad

454

7-29 A coal-burning power plant produces 300 MW of power. The amount of coal consumed during a one-day period and the rate of air flowing through the furnace are to be determined.  

E-Print Network (OSTI)

7-11 7-29 A coal-burning power plant produces 300 MW of power. The amount of coal consumed during The heating value of the coal is given to be 28,000 kJ/kg. Analysis (a) The rate and the amount of heat inputs'tQQ The amount and rate of coal consumed during this period are kg/s48.33 s360024 kg10893.2 MJ/kg28 MJ101.8 6

Bahrami, Majid

455

Application of a high-power KrF laser for the study of supersonic gas flows and the development of hydrodynamic instabilities in layered media  

SciTech Connect

The design of a miniature laser shock tube for the study of a wide range of hydrodynamic phenomena in liquids at pressures greater than 10 kbar and in supersonic flows with large Mach numbers (greater than 10) is discussed. A substance filling a chamber of quadratic cross section, with a characteristic size of several centimetres, is compressed and accelerated due to local absorption of 100 ns, 100 J KrF laser pulses near the entrance window. It is proposed to focus a laser beam by a prism raster, which provides a uniform intensity distribution over the tube cross section. The system can be used to study the hypersonic flow past objects of complex shape and the development of hydrodynamic instabilities in the case of a passage of a shock wave or a compression wave through the interfaces between different media. (laser applications and other topics in quantum electronics)

Zvorykin, V D; Lebo, I G [P.N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2000-06-30T23:59:59.000Z

456

Approaching 10% Conversion Efficiency Using Tandem Organic Photovoltaic Cells with Enhanced Optical Coupling: Final Report, October 2004 - December 2007  

SciTech Connect

To find routes to achieving nearly 10% power conversion efficiency based on a new generation of organic photovoltaic cells using vapor-deposited, small-molecular-weight organic materials.

Forrest, S.

2008-08-01T23:59:59.000Z

457

Enhanced solar energy conversion in Au-doped, single-wall carbon nanotube-Si heterojunction cells  

Science Journals Connector (OSTI)

The power conversion efficiency (PCE) of single-wall carbon ... improved electrical conductivity of SCNT by increasing the carrier concentration and the enhancing the absorbance of ... doped SCNT/Si cells possess...

Leifeng Chen; Hong He; Shijun Zhang; Chen Xu; Jianjiang Zhao…

2013-05-01T23:59:59.000Z

458

The efficiency of conversion of energy in an electric-discharge light-gas accelerator of bodies  

Science Journals Connector (OSTI)

The results are given of investigation of the processes of energy transfer in a power supply-projectile system, ... the working gas and a number of other factors on the efficiency of energy conversion. It is foun...

A. V. Budin; V. A. Kolikov; F. G. Rutberg

2008-06-01T23:59:59.000Z

459

Cotton flow  

E-Print Network (OSTI)

Using the conformally invariant Cotton tensor, we define a geometric flow, the "Cotton flow", which is exclusive to three dimensions. This flow tends to evolve the initial metrics into conformally flat ones, and is somewhat orthogonal to the Yamabe flow, the latter being a flow within a conformal class. We define an entropy functional, and study the flow of nine homogeneous spaces both numerically and analytically. In particular, we show that the arbitrarily deformed homogeneous 3-sphere flows into the round 3-sphere. Two of the nine homogeneous geometries, which are degenerated by the Ricci flow, are left intact by the Cotton flow.

Ali Ulas Ozgur Kisisel; Ozgur Sarioglu; Bayram Tekin

2008-06-17T23:59:59.000Z

460

2011 Biomass Program Platform Peer Review: Thermochemical Conversion...  

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

Thermochemical Conversion 2011 Biomass Program Platform Peer Review: Thermochemical Conversion "This document summarizes the recommendations and evaluations provided by an...

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


461

Potassium Rankine cycle nuclear power systems for spacecraft and lunar-mass surface power  

SciTech Connect

The potassium Rankine cycle has high potential for application to nuclear power systems for spacecraft and surface power on the moon and Mars. A substantial effort on the development of Rankine cycle space power systems was carried out in the 1960`s. That effort is summarized and the status of the technology today is presented. Space power systems coupling Rankine cycle power conversion to both the SP-100 reactor and thermionic reactors as a combined power cycle are described in the paper.

Holcomb, R.S.

1992-07-01T23:59:59.000Z

462

Expressive Power and Complexity in Algebraic Logic  

Science Journals Connector (OSTI)

......the expressive power and complexity...applies to any system that has to handle...the expressive power and complexity...closed under the operations of taking converse...MA. Expressive Power and Complexity...simulations. In Handbook of Theoretical...about Physical Systems, 373-381......

ROBIN HIRSCH

1997-06-01T23:59:59.000Z

463

6.334 Power Electronics, Spring 2003  

E-Print Network (OSTI)

The application of electronics to energy conversion and control; phase-controlled rectifier/inverter circuits, dc/dc converters, high-frequency inverters, and motion control systems. Characteristics of power semiconductor ...

Perreault, David John

464

Covered Product Category: Uninterruptible Power Supplies (for...  

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

more of the energy supplied to the equipment downstream. The loss is from the power conversion within the UPS, which creates heat that must then be managed. For systems that are...

465

MicroPower Global | Open Energy Information  

Open Energy Info (EERE)

owner of semiconductor-based heat conversion to electricity technology for use in waste-heat, solar thermal and other uses. References: MicroPower Global1 This article is...

466

CO2 mass transfer and conversion to biomass in a horizontal gas–liquid photobioreactor  

Science Journals Connector (OSTI)

Abstract This study deals with CO2 mass transfers and biomass conversion in an industrial horizontal tubular photobioreactor. An analytical approach is used to determine an expression modeling the influence of CO2 mass transfers on the overall biomass conversion efficiency for a given culture broth, heat and light conditions. Fluid mechanics and mass transfer are predicted with a classical two-phase flow approach (Taitel and Dukler, 1976) combined with a dissolution correlation developed and tested in the laboratory (Valiorgue et al., 2011). The influence of the stripping gas, removing the excess of oxygen in the liquid, on the conversion to biomass efficiency is shown to be not negligible. The expression is used to evaluate how the photobioreactor's design and process parameters can be tuned in order to improve biomass conversion efficiency. The biomass conversion efficiency evolution with the photobioreactor's length was found to behave asymptotically and it was explained by the relative orders of magnitude of gas dissolution and gas stripping. It has been shown that the gas flow rate for stripping and therefore the oxygen removal will be limited when further increasing the industrial photobioreactor's length for a given objective of CO2 conversion to biomass efficiency.

P. Valiorgue; H. Ben Hadid; M. El Hajem; L. Rimbaud; A. Muller-Feuga; J.Y. Champagne

2014-01-01T23:59:59.000Z

467

Power Plant Power Plant  

E-Print Network (OSTI)

Basin Center for Geothermal Energy at University of Nevada, Reno (UNR) 2 Nevada Geodetic LaboratoryStillwater Power Plant Wabuska Power Plant Casa Diablo Power Plant Glass Mountain Geothermal Area Lassen Geothermal Area Coso Hot Springs Power Plants Lake City Geothermal Area Thermo Geothermal Area

Tingley, Joseph V.

468

Energy Calculator- Common Units and Conversions  

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

Energy Calculator - Common Units and Conversions Energy Calculator - Common Units and Conversions Calculators for Energy Used in the United States: Coal Electricity Natural Gas Crude Oil Gasoline Diesel & Heating Oil Coal Conversion Calculator Short Tons Btu Megajoules Metric Tons Clear Calculate 1 Short Ton = 20,169,000 Btu (based on U.S. consumption, 2007) Electricity Conversion Calculator KilowattHours Btu Megajoules million Calories Clear Calculate 1 KilowattHour = 3,412 Btu Natural Gas Conversion Calculator Cubic Feet Btu Megajoules Cubic Meters Clear Calculate 1 Cubic Foot = 1,028 Btu (based on U.S. consumption, 2007); 1 therm = 100,000 Btu; 1 terajoule = 1,000,000 megajoules Crude Oil Conversion Calculator Barrels Btu Megajoules Metric Tons* Clear Calculate 1 Barrel = 42 U.S. gallons = 5,800,000 Btu (based on U.S. consumption,

469

Documents: DUF6 Conversion EIS Supporting Documents  

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

DUF6 Conversion EIS DUF6 Conversion EIS Search Documents: Search PDF Documents View a list of all documents NEPA Compliance: DUF6 Conversion EIS Supporting Documents PDF Icon Notice of Change in National Environmental Policy Act (NEPA) Compliance Approach for the Depleted Uranium Hexafluoride (DUF6) Conversion Facilities Project 38 KB details PDF Icon Press Release: DOE Seeks Public Input for Depleted Uranium Hexafluoride Environmental Impact Statement 90 KB details PDF Icon Advance Notice of Intent To Prepare an Environmental Impact Statement for Depleted Uranium Hexafluoride Conversion Facilities 52 KB details PDF Icon Notice of Intent to Prepare an Environmental Impact Statement for Depleted Uranium Hexafluoride Conversion Facilities 60 KB details PDF Icon Overview: Depleted Uranium Hexafluoride (DUF6) Management Program

470

DUF6 Conversion Facility EIS Alternatives  

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

Alternatives Alternatives Depleted UF6 Conversion Facility EIS Alternatives Alternatives included in the Depleted UF6 Conversion Facility EISs. Proposed Action The proposed action evaluated in each EIS is to construct and operate a conversion facility at each site for conversion of the DOE DUF6 inventory. The time period considered is a construction period of approximately 2 years, an operational period of 25 years at Paducah and 18 years at Portsmouth, and the decontamination and decommissioning (D&D) of the facility of about 3 years. The EISs assess the potential environmental impacts from the following proposed activities: Construction, operation, maintenance, and D&D of the proposed DUF6 conversion facility at each site; Transportation of uranium conversion products and waste materials to a disposal facility;

471

Planning Document for an NBSR Conversion Safety Analysis Report  

SciTech Connect

The NIST Center for Neutron Research (NCNR) is a reactor-laboratory complex providing the National Institute of Standards and Technology (NIST) and the nation with a world-class facility for the performance of neutron-based research. The heart of this facility is the National Bureau of Standards Reactor (NBSR). The NBSR is a heavy water moderated and cooled reactor operating at 20 MW. It is fueled with high-enriched uranium (HEU) fuel elements. A Global Threat Reduction Initiative (GTRI) program is underway to convert the reactor to low-enriched uranium (LEU) fuel. This program includes the qualification of the proposed fuel, uranium and molybdenum alloy foil clad in an aluminum alloy, and the development of the fabrication techniques. This report is a planning document for the conversion Safety Analysis Report (SAR) that would be submitted to, and approved by, the Nuclear Regulatory Commission (NRC) before the reactor could be converted.This report follows the recommended format and content from the NRC codified in NUREG-1537, “Guidelines for Preparing and Reviewing Applications for the Licensing of Non-power Reactors,” Chapter 18, “Highly Enriched to Low-Enriched Uranium Conversions.” The emphasis herein is on the SAR chapters that require significant changes as a result of conversion, primarily Chapter 4, Reactor Description, and Chapter 13, Safety Analysis. The document provides information on the proposed design for the LEU fuel elements and identifies what information is still missing. This document is intended to assist ongoing fuel development efforts, and to provide a platform for the development of the final conversion SAR. This report contributes directly to the reactor conversion pillar of the GTRI program, but also acts as a boundary condition for the fuel development and fuel fabrication pillars.

Diamond D. J.; Baek J.; Hanson, A.L.; Cheng, L-Y.; Brown, N.; Cuadra, A.

2013-09-25T23:59:59.000Z

472

Advanced Coal Conversion Process Demonstration  

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

Clean Coal Technology Program Clean Coal Technology Program Advanced Coal Conversion Process Demonstration A DOE Assessment DOE/NETL-2005/1217 U.S. Department of Energy Office of Fossil Energy National Energy Technology Laboratory April 2005 2 Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name,

473

Thermophotovoltaic Energy Conversion for Space  

Science Journals Connector (OSTI)

Heat is converted to electricity by using a heated surface (the emitter) that radiates infrared (IR) photons to an adjacent low bandgap photovoltaic cell (typically made with binary, ternary, or quaternary semiconductors such as InGaAs, GaSb, InAs, or InGaAsSb), which converts these IR photons to electricity. ... Solid-state TPV energy conversion uses photovoltaic devices in the form of a p?n diode to convert radiant thermal photons directly into electricity. ... The overall system efficiency of a TPV system is the product of factors attributable to the TPV cell efficiency, the spectral filter, and the cell module factor which includes effects of parasitic photon absorption in the nonactive diode area and is defined as the total photonic energy absorbed in the active diode area divided by the total photonic energy absorption. ...

V. L. Teofilo; P. Choong; J. Chang; Y.-L. Tseng; S. Ermer

2008-05-22T23:59:59.000Z

474

Power Factor Reactive Power  

E-Print Network (OSTI)

power: 130 watts Induction motor PSERC Incandescent lights 0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0 power: 150 watts #12;Page 4 PSERC Incandescent Lights PSERC Induction motor with no load #12;Page 5 Incandescent Lights #12;Page 7 PSERC Incandescent lights power: Power = 118 V x 1.3 A = 153 W = 0.15 kW = power

475

E-Print Network 3.0 - axial flow turbines Sample Search Results  

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

turbines Search Powered by Explorit Topic List Advanced Search Sample search results for: axial flow turbines...

476

E-Print Network 3.0 - axial flow turbine Sample Search Results  

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

turbine Search Powered by Explorit Topic List Advanced Search Sample search results for: axial flow turbine...

477

Synoptic and local influences on boundary layer processes, with an application to California wind power  

E-Print Network (OSTI)

maps showing locations of wind power conversion facilities,of US winds and wind power at 80 m derived fromEvaluation of global wind power. Journal of Geo- physical

Mansbach, David K.

2010-01-01T23:59:59.000Z

478

Next-Generation Thermionic Solar Energy Conversion  

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

Thermionic Solar Energy Conversion SLAC National Accelerator Laboratory Award Number: CPS 25659 | April 15, 2013 | Melosh * Fabricate heterostructure semiconductor cathodes based...

479

Biochemical Conversion: Using Hydrolysis, Fermentation, and Catalysis...  

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

will enable energy-efficient biochemical conversion of lignocellulosic biomass into biofuels that are compatible with today's vehicles and infrastructure. Photos (clockwise from...

480

Solar Energy, Its Conversion and Utilization  

Science Journals Connector (OSTI)

The basis of the discussions is the University of Florida Solar Energy and Energy Conversion Laboratory with its Solar House and its Solar-Electric Car.

Erich A. Farber

1974-01-01T23:59:59.000Z

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


481

Economic Considerations of Biomass Conversion Processes  

Science Journals Connector (OSTI)

Earlier chapters have described various biomass conversion processes and processing procedures. This chapter provides a systematic method of estimating biomass process economics and determining the revenue requir...

Fred A. Schooley

1981-01-01T23:59:59.000Z

482

LED Street Lighting Conversion Workshop Presentations  

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

This page provides links to the presentations given at the National League of Cities Mobile Workshop, LED Street Lighting Conversion: Saving Your Community Money, While Improving Public Safety,...

483

Conversion Technologies for Advanced Biofuels - Carbohydrates...  

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

Production Conversion Technologies for Advanced Biofuels - Carbohydrates Production Purdue University report-out presentation at the CTAB webinar on Carbohydrates Production....

484

Conversion Technologies for Advanced Biofuels - Carbohydrates...  

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

Upgrading Conversion Technologies for Advanced Biofuels - Carbohydrates Upgrading PNNL report-out presentation at the CTAB webinar on carbohydrates upgrading. ctabwebinarcarbohyd...

485

Developing Functionalized Graphene Materials for Biomass Conversion...  

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

Developing Functionalized Graphene Materials for Biomass Conversion The goal of this research is to develop low cost catalysts based on graphene-derived nanomaterials, and use them...

486

Energy Conversion, an Energy Frontier Research  

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

electricity, will become increasingly important. Indeed enhancements in efficiencies of energy conversion technologies that are readily adaptable in any environment will con-...

487

Energy Conversion, an Energy Frontier Research  

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

most pressing problems. Indeed, our success at discovering new paradigms for efficient energy conversion, with minimal environmental impact, will largely determine humankind's...

488

Solid-State Energy Conversion Overview  

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

eere.energy.gov 1 Solid-State Energy Conversion Overview John W. Fairbanks Department of Energy Vehicle Technologies Annual Merit Review June 11, 2010 Vehicle Technologies Program...

489

Conversion Technologies for Advanced Biofuels ? Carbohydrates...  

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

balance measurements Biological Conversion of Sugars to Hydrocarbons - R&D Activities Energy Efficiency & Renewable Energy eere.energy.gov 5 Feedstocks Organism design for...

490

Next-Generation Thermionic Solar Energy Conversion  

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

Microscale-enhanced thermionic emitters will enable high-efficiency, solar-to-electrical conversion by taking advantage of both heat and light. Image from Stanford University...

491

"Approaches to Ultrahigh Efficiency Solar Energy Conversion"...  

Office of Science (SC) Website

"Approaches to Ultrahigh Efficiency Solar Energy Conversion" Webinar Energy Frontier Research Centers (EFRCs) EFRCs Home Centers Research Science Highlights News & Events EFRC News...

492

"Fundamental Challenges in Solar Energy Conversion" workshop...  

Office of Science (SC) Website

Fundamental Challenges in Solar Energy Conversion" workshop hosted by LMI-EFRC Energy Frontier Research Centers (EFRCs) EFRCs Home Centers Research Science Highlights News & Events...

493

Aero-Acoustic Analysis of Wells Turbine for Ocean Wave Energy Conversion  

E-Print Network (OSTI)

Aero-Acoustic Analysis of Wells Turbine for Ocean Wave Energy Conversion Ralf Starzmann Fluid the water wave motion into a bi-directional air flow, which in turn drives an air turbine. The Wells turbine the environmental impact of an in situ Wells turbine in more detail requires an in depth understanding

Frandsen, Jannette B.

494

Conversion model aids scale-up of mobil's fluid-bed MTG process  

Science Journals Connector (OSTI)

Mobil's fluid-bed Methanol-to-Gasoline (MTG) process was successfully scaled-up, from 0.04m diameter reactor, through 0.1m, to 0.6m diameter demonstration plant. Gas tracer responses in cold flow models were interpreted by a one-dimensional axial dispersion model, and combined with reaction kinetics to develop a conversion model.

M. Edwards; A. Avidan

1986-01-01T23:59:59.000Z

495

Summary of energy flow measurements and calculations made on the INCE standard test structures  

Science Journals Connector (OSTI)

In 1996 a series of standard test structures was conceived and manufactured by members of the Institute of Noise Control Engineering (INCE) [Cuschieri Burroughs and Carroll Evaluation of Structure?Borne Noise Prediction Techniques Review Proceedings of Noise?Con 98 April 1998 pp. 315–320]. The structures include a Lexan T?shaped beam and two ribbed panels of identical geometries but different materials: aluminum and lexan. In subsequent years a wide variety of investigators from the U.S. and around the world have conducted experimental and numerical studies on the test structures particularly on energy flow parameters such as power input power dissipation and power flow. Most of the studies have been performed at low frequencies and have shown phenomena such as the conversion of flexural wave power to longitudinal wave power at the T?beam joint and the nature of the structural intensity fields in the ribbed panels. Measurements and computations compare well. At high frequencies Statistical Energy Analysis (SEA) techniques have shown that energy tends to become trapped in the drive leg of the T?beam. SEA studies on the ribbed panels show that the Lexan panel transmits less energy across the ribs than the aluminum panel does due primarily to differences in material loss factor.

2002-01-01T23:59:59.000Z

496

Site insolation and wind power characteristics: technical report Midwest region  

SciTech Connect

This phase of the Site Insolation and Wind Power Characteristics Study was performed to provide statistical information on the expected future availability of solar and wind power at various sites in the Midwest Region of the US Historic data (SOLMET), at 22 National Weather Service stations with hourly solar insolation and collateral meteorological information, were interrogated to provide an estimate of future trends. Solar data are global radiation incident on a horizontal surface, and wind data represent wind power normal to the air flow. Selected insolation and wind power conditions were investigated for their occurrence and persistence, for defined periods of time, on a monthly basis. Global horizontal insolation is related to inclined surfaces at each site. Ratios are provided, monthly, for multiplying global insolation to obtain insolation estimates on south-facing surfaces inclined at different angles with respect to the horizontal. Also, joint probability distribution tables are constructed showing the number of occurrences, out of a finite sample size, of daily average solar and wind power within selected intervals, by month. Information of this nature is intended as an aid to preliminary planning activities for the design and operation of solar and wind energy utilization and conversion systems.

None

1980-08-01T23:59:59.000Z

497

Energy Conversion DevicesEnergy Conversion Devices Fuel Cell Electrocatalyst Development Program  

E-Print Network (OSTI)

for several groups of electrocatalysts ECD PEMFC Catalyst Development Evaluation programs exist for severalEnergy Conversion Devices PEMFC Electrocatalyst Development Program Contact information: Dr. Peter Faguy pfaguyEnergy Conversion DevicesEnergy Conversion Devices Fuel Cell Electrocatalyst Development Program

498

Gene conversion in the rice genome  

E-Print Network (OSTI)

. Over 60% of the conversions we detected were between chromosomes. We found that the inter-chromosomal conversions distributed between chromosome 1 and 5, 2 and 6, and 3 and 5 are more frequent than genome average (Z-test, P < 0.05). The frequencies...

Xu, Shuqing; Clark, Terry; Zheng, Hongkun; Vang, SÃ ¸ ren; Li, Ruiqiang; Wong, Gane Ka-Shu; Wang, Jun; Zheng, Xiaoguang

2008-02-25T23:59:59.000Z

499

Approaches for biological and biomimetic energy conversion  

Science Journals Connector (OSTI)

...biological and biomimetic energy conversion 10.1073...that are related to energy conversion: specifically...synthetic and/or hybrid devices is still...systems that produce energy in an efficient...costs are related to infrastructure, such as supporting...inverters, and grid connections. For...

David A. LaVan; Jennifer N. Cha

2006-01-01T23:59:59.000Z

500

Parameterizing energy conversion on rough topography  

E-Print Network (OSTI)

Parameterizing energy conversion on rough topography using bottom pressure sensors to measure form and mixing U0 Form drag pressure Tidal energy conversion Form drag causes: - internal wave generation - eddy Sound, WA Point Three Tree Previous work McCabe et al., 2006 > Measured the internal form drag

Warner, Sally