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Sample records for hybrid cooling system

  1. A CLASSIFICATION SCHEME FOR THE COMMON PASSIVE AND HYBRID HEATING AND COOLING SYSTEMS

    E-Print Network [OSTI]

    Holtz, Michael J.

    2011-01-01

    Common Passive and Hybrid Heating Cooling Systems Michael].THE COMMON PASSIVE AND HYBRID HEATING AND COOLING SYSTEMS

  2. A CLASSIFICATION SCHEME FOR THE COMMON PASSIVE AND HYBRID HEATING AND COOLING SYSTEMS

    E-Print Network [OSTI]

    Holtz, Michael J.

    2011-01-01

    Passive and Hybrid Heating Cooling Systems Michael]. Holtz,PASSIVE AND HYBRID HEATING AND COOLING SYSTEMS Michael J.of passive and hybrid space heating and cooling systems are

  3. A CLASSIFICATION SCHEME FOR THE COMMON PASSIVE AND HYBRID HEATING AND COOLING SYSTEMS

    E-Print Network [OSTI]

    Holtz, Michael J.

    2011-01-01

    AND HYBRID HEATING AND COOLING SYSTEMS Michael J. Holtzmost common passive cooling systems and a representativepassive space heating and cooling systems. It is based upon

  4. DRAFT INTERIM REPORT: NATIONAL PROGRAM PLAN FOR PASSIVE AND HYBRID SOLAR HEATING AND COOLING

    E-Print Network [OSTI]

    Authors, Various

    2012-01-01

    passive and hybrid space heating systems. Space Cooling Aand hybrid solar heating and cooling systems. Experimentspassive, and hybrid systems for heating, cooling, and

  5. Hybrid Cooling Systems for Low-Temperature Geothermal Power Production

    SciTech Connect (OSTI)

    Ashwood, A.; Bharathan, D.

    2011-03-01

    This paper describes the identification and evaluation of methods by which the net power output of an air-cooled geothermal power plant can be enhanced during hot ambient conditions with a minimal amount of water use.

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

    SciTech Connect (OSTI)

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

    2012-06-19

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

  7. A CLASSIFICATION SCHEME FOR THE COMMON PASSIVE AND HYBRID HEATING AND COOLING SYSTEMS

    E-Print Network [OSTI]

    Holtz, Michael J.

    2011-01-01

    INTRODUCTION A passive building design attempts, within eco-and features of the building, the passive system componentsenergy. Passive cooling also uses elements of the building

  8. Controllability of optical bistability, cooling and entanglement in hybrid cavity optomechanical systems by nonlinear atom-atom interaction

    E-Print Network [OSTI]

    A. Dalafi; M. H. Naderi; M. Soltanolkotabi

    2013-04-17

    We investigate the effects of atomic collisions as well as optomechanical mirror-field coupling on the optical bistability in a hybrid system consisting of a Bose-Einstein condensate inside a driven optical cavity with a moving end mirror. It is shown that the bistability of the system can be controlled by the s-wave scattering frequency which can provide the possibility of realizing a controllable optical switch. On the other hand, by studying the effect of the Bogoliubov mode, as a secondary mechanical mode relative to the mirror vibrations, on the cooling process as well as the bipartite mirror-field and atom-field entanglements we find an interpretation for the cooling of the Bogoliubov mode. The advantage of this hybrid system in comparison to the bare optomecanical cavity with a two-mode moving mirror is the controllability of the frequency of the secondary mode through the s-wave scattering interaction.

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

    SciTech Connect (OSTI)

    None

    1980-01-01

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

  10. Coherent control and feedback cooling in a remotely-coupled hybrid atom-optomechanical system

    E-Print Network [OSTI]

    James S. Bennett; Lars S. Madsen; Mark Baker; Halina Rubinsztein-Dunlop; Warwick P Bowen

    2014-06-30

    Cooling to the motional ground state is an important first step in the preparation of nonclassical states of mesoscopic mechanical oscillators. Light-mediated coupling to a remote atomic ensemble has been proposed as a method to reach the ground state for low frequency oscillators. The ground state can also be reached using optical measurement followed by feedback control. Here we investigate the possibility of enhanced cooling by combining these two approaches. The combination, in general, outperforms either individual technique, though atomic ensemble-based cooling and feedback cooling each individually dominate over large regions of parameter space.

  11. Optimization of hybrid-water/air-cooled condenser in an enhanced...

    Open Energy Info (EERE)

    Optimization of hybrid-waterair-cooled condenser in an enhanced turbine geothermal ORC system Geothermal Project Jump to: navigation, search Last modified on July 22, 2011....

  12. Cooling Water System Optimization 

    E-Print Network [OSTI]

    Aegerter, R.

    2005-01-01

    During summer months, many manufacturing plants have to cut back in rates because the cooling water system is not providing sufficient cooling to support higher production rates. There are many low/no-cost techniques available to improve tower...

  13. Data center cooling system

    DOE Patents [OSTI]

    Chainer, Timothy J; Dang, Hien P; Parida, Pritish R; Schultz, Mark D; Sharma, Arun

    2015-03-17

    A data center cooling system may include heat transfer equipment to cool a liquid coolant without vapor compression refrigeration, and the liquid coolant is used on a liquid cooled information technology equipment rack housed in the data center. The system may also include a controller-apparatus to regulate the liquid coolant flow to the liquid cooled information technology equipment rack through a range of liquid coolant flow values based upon information technology equipment temperature thresholds.

  14. Cooling water distribution system

    DOE Patents [OSTI]

    Orr, Richard (Pittsburgh, PA)

    1994-01-01

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

  15. Solar Central Receiver Hybrid Power Systems sodium-cooled receiver concept. Final report. Volume I. Executive summary

    SciTech Connect (OSTI)

    None

    1980-01-01

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

  16. Energy and economic assessment of desiccant cooling systems coupled with single glazed air and hybrid PV/thermal solar collectors for applications in hot and humid climate

    SciTech Connect (OSTI)

    Beccali, Marco; Finocchiaro, Pietro; Nocke, Bettina

    2009-10-15

    This paper presents a detailed analysis of the energy and economic performance of desiccant cooling systems (DEC) equipped with both single glazed standard air and hybrid photovoltaic/thermal (PV/t) collectors for applications in hot and humid climates. The use of 'solar cogeneration' by means of PV/t hybrid collectors enables the simultaneous production of electricity and heat, which can be directly used by desiccant air handling units, thereby making it possible to achieve very energy savings. The present work shows the results of detailed simulations conducted for a set of desiccant cooling systems operating without any heat storage. System performance was investigated through hourly simulations for different systems and load combinations. Three configurations of DEC systems were considered: standard DEC, DEC with an integrated heat pump and DEC with an enthalpy wheel. Two kinds of building occupations were considered: office and lecture room. Moreover, three configurations of solar-assisted air handling units (AHU) equipped with desiccant wheels were considered and compared with standard AHUs, focusing on achievable primary energy savings. The relationship between the solar collector's area and the specific primary energy consumption for different system configurations and building occupation patterns is described. For both occupation patterns, sensitivity analysis on system performance was performed for different solar collector areas. Also, this work presents an economic assessment of the systems. The cost of conserved energy and the payback time were calculated, with and without public incentives for solar cooling systems. It is worth noting that the use of photovoltaics, and thus the exploitation of related available incentives in many European countries, could positively influence the spread of solar air cooling technologies (SAC). An outcome of this work is that SAC systems equipped with PV/t collectors are shown to have better performance in terms of primary energy saving than conventional systems fed by vapour compression chillers and coupled with PV cells. All SAC systems present good figures for primary energy consumption. The best performances are seen in systems with integrated heat pumps and small solar collector areas. The economics of these SAC systems at current equipment costs and energy prices are acceptable. They become more interesting in the case of public incentives of up to 30% of the investment cost (Simple Payback Time from 5 to 10 years) and doubled energy prices. (author)

  17. Hybrid Air-Cooled Condenser - Energy Innovation Portal

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

    Hybrid Air-Cooled Condenser National Renewable Energy Laboratory Contact NREL About This Technology Technology Marketing Summary Geothermal energy has been a viable energy source...

  18. Passive containment cooling system

    DOE Patents [OSTI]

    Conway, Lawrence E. (Robinson Township, Allegheny County, PA); Stewart, William A. (Penn Hills Township, Allegheny County, PA)

    1991-01-01

    A containment cooling system utilizes a naturally induced air flow and a gravity flow of water over the containment shell which encloses a reactor core to cool reactor core decay heat in two stages. When core decay heat is greatest, the water and air flow combine to provide adequate evaporative cooling as heat from within the containment is transferred to the water flowing over the same. The water is heated by heat transfer and then evaporated and removed by the air flow. After an initial period of about three to four days when core decay heat is greatest, air flow alone is sufficient to cool the containment.

  19. Gas turbine cooling system

    DOE Patents [OSTI]

    Bancalari, Eduardo E. (Orlando, FL)

    2001-01-01

    A gas turbine engine (10) having a closed-loop cooling circuit (39) for transferring heat from the hot turbine section (16) to the compressed air (24) produced by the compressor section (12). The closed-loop cooling system (39) includes a heat exchanger (40) disposed in the flow path of the compressed air (24) between the outlet of the compressor section (12) and the inlet of the combustor (14). A cooling fluid (50) may be driven by a pump (52) located outside of the engine casing (53) or a pump (54) mounted on the rotor shaft (17). The cooling circuit (39) may include an orifice (60) for causing the cooling fluid (50) to change from a liquid state to a gaseous state, thereby increasing the heat transfer capacity of the cooling circuit (39).

  20. Rotary engine cooling system

    SciTech Connect (OSTI)

    Jones, C.

    1988-07-26

    A rotary internal combustion engine is described comprising: a rotor housing forming a trochoidal cavity therein; an insert of refractory material received in the recess, an element of a fuel injection and ignition system extending through the housing and insert bores, and the housing having cooling passages extending therethrough. The cooling passages are comprised of drilled holes.

  1. Hydronic rooftop cooling systems

    DOE Patents [OSTI]

    Bourne, Richard C. (Davis, CA); Lee, Brian Eric (Monterey, CA); Berman, Mark J. (Davis, CA)

    2008-01-29

    A roof top cooling unit has an evaporative cooling section that includes at least one evaporative module that pre-cools ventilation air and water; a condenser; a water reservoir and pump that captures and re-circulates water within the evaporative modules; a fan that exhausts air from the building and the evaporative modules and systems that refill and drain the water reservoir. The cooling unit also has a refrigerant section that includes a compressor, an expansion device, evaporator and condenser heat exchangers, and connecting refrigerant piping. Supply air components include a blower, an air filter, a cooling and/or heating coil to condition air for supply to the building, and optional dampers that, in designs that supply less than 100% outdoor air to the building, control the mixture of return and ventilation air.

  2. Superconductor rotor cooling system

    DOE Patents [OSTI]

    Gamble, Bruce B.; Sidi-Yekhlef, Ahmed; Schwall, Robert E.; Driscoll, David I.; Shoykhet, Boris A.

    2004-11-02

    A system for cooling a superconductor device includes a cryocooler located in a stationary reference frame and a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with a rotating reference frame in which the superconductor device is located. A method of cooling a superconductor device includes locating a cryocooler in a stationary reference frame, and transferring heat from a superconductor device located in a rotating reference frame to the cryocooler through a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with the rotating reference frame.

  3. Superconductor rotor cooling system

    DOE Patents [OSTI]

    Gamble, Bruce B. (Wellesley, MA); Sidi-Yekhlef, Ahmed (Framingham, MA); Schwall, Robert E. (Northborough, MA); Driscoll, David I. (South Euclid, OH); Shoykhet, Boris A. (Beachwood, OH)

    2002-01-01

    A system for cooling a superconductor device includes a cryocooler located in a stationary reference frame and a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with a rotating reference frame in which the superconductor device is located. A method of cooling a superconductor device includes locating a cryocooler in a stationary reference frame, and transferring heat from a superconductor device located in a rotating reference frame to the cryocooler through a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with the rotating reference frame.

  4. In hot and dry weather such as Phoenix summers, Air Conditioning (AC) and cooling becomes a large percentage of the power load on the grid. In this thesis the performance of a Hybrid AC System (HACS) is modeled and

    E-Print Network [OSTI]

    In hot and dry weather such as Phoenix summers, Air Conditioning (AC) and cooling becomes a large percentage of the power load on the grid. In this thesis the performance of a Hybrid AC System (HACS, especially during peak hours. In addition to solar photovoltaic (PV) panels, the system includes an ice

  5. Hybrid Systems Frits Vaandrager

    E-Print Network [OSTI]

    Vaandrager, Frits

    on these data, the computer may decide to turn on a heating system, switch off a pump, etc. When a dangerous1 Hybrid Systems Frits Vaandrager 1 Introduction Hybrid systems are systems that intermix discrete. The specification, design and analysis of hybrid systems require a synthesis of ideas, concepts, mathe­ matical

  6. Passive containment cooling system

    DOE Patents [OSTI]

    Billig, P.F.; Cooke, F.E.; Fitch, J.R.

    1994-01-25

    A passive containment cooling system includes a containment vessel surrounding a reactor pressure vessel and defining a drywell therein containing a non-condensable gas. An enclosed wetwell pool is disposed inside the containment vessel, and a gravity driven cooling system (GDCS) pool is disposed above the wetwell pool in the containment vessel and is vented to the drywell. An isolation pool is disposed above the GDCS pool and includes an isolation condenser therein. The condenser has an inlet line disposed in flow communication with the drywell for receiving the non-condensable gas along with any steam released therein following a loss-of-coolant accident (LOCA). The condenser also has an outlet line disposed in flow communication with the drywell for returning to the drywell both liquid condensate produced upon cooling of the steam and the non-condensable gas for reducing pressure within the containment vessel following the LOCA. 1 figure.

  7. Passive containment cooling system

    DOE Patents [OSTI]

    Billig, Paul F. (San Jose, CA); Cooke, Franklin E. (San Jose, CA); Fitch, James R. (San Jose, CA)

    1994-01-01

    A passive containment cooling system includes a containment vessel surrounding a reactor pressure vessel and defining a drywell therein containing a non-condensable gas. An enclosed wetwell pool is disposed inside the containment vessel, and a gravity driven cooling system (GDCS) pool is disposed above the wetwell pool in the containment vessel and is vented to the drywell. An isolation pool is disposed above the GDCS pool and includes an isolation condenser therein. The condenser has an inlet line disposed in flow communication with the drywell for receiving the non-condensable gas along with any steam released therein following a loss-of-coolant accident (LOCA). The condenser also has an outlet line disposed in flow communication with the drywell for returning to the drywell both liquid condensate produced upon cooling of the steam and the non-condensable gas for reducing pressure within the containment vessel following the LOCA.

  8. Ground Water Cooling System 

    E-Print Network [OSTI]

    Greaves, K.; Chave, G. H.

    1984-01-01

    has a total shop area of 128,000 square feet and the majority of the machine tools are equipped with computerized numerical controls. The cooling system was designed around five (5) floor mounted, 50,000 CFM, air handling units which had been...

  9. Diesel lubrication and cooling systems

    SciTech Connect (OSTI)

    NONE

    1994-12-31

    The film describes the parts of diesel lubricating and cooling systems and how they work in relation to each other.

  10. Diesel lubrication and cooling systems

    SciTech Connect (OSTI)

    Not Available

    1994-01-01

    The film describes the parts of diesel lubricating and cooling systems and how they work in relation to each other.

  11. CONTROL SYSTEM FOR SOLAR HEATING and COOLING

    E-Print Network [OSTI]

    Dols, C.

    2010-01-01

    operating solar heating and cooling systems covering a widepractical heating and cooling system configurations andexperimental heating and cooling system, the main purpose of

  12. Liquid metal cooled nuclear reactors with passive cooling system

    DOE Patents [OSTI]

    Hunsbedt, Anstein (Los Gatos, CA); Fanning, Alan W. (San Jose, CA)

    1991-01-01

    A liquid metal cooled nuclear reactor having a passive cooling system for removing residual heat resulting from fuel decay during reactor shutdown. The passive cooling system comprises a plurality of cooling medium flow circuits which cooperate to remove and carry heat away from the fuel core upon loss of the normal cooling flow circuit to areas external thereto.

  13. Emergency core cooling system

    DOE Patents [OSTI]

    Schenewerk, William E. (Sherman Oaks, CA); Glasgow, Lyle E. (Westlake Village, CA)

    1983-01-01

    A liquid metal cooled fast breeder reactor provided with an emergency core cooling system includes a reactor vessel which contains a reactor core comprising an array of fuel assemblies and a plurality of blanket assemblies. The reactor core is immersed in a pool of liquid metal coolant. The reactor also includes a primary coolant system comprising a pump and conduits for circulating liquid metal coolant to the reactor core and through the fuel and blanket assemblies of the core. A converging-diverging venturi nozzle with an intermediate throat section is provided in between the assemblies and the pump. The intermediate throat section of the nozzle is provided with at least one opening which is in fluid communication with the pool of liquid sodium. In normal operation, coolant flows from the pump through the nozzle to the assemblies with very little fluid flowing through the opening in the throat. However, when the pump is not running, residual heat in the core causes fluid from the pool to flow through the opening in the throat of the nozzle and outwardly through the nozzle to the assemblies, thus providing a means of removing decay heat.

  14. Hybrid Systems State estimation for hybrid systems: applications

    E-Print Network [OSTI]

    Tomlin, Claire

    Hybrid Systems State estimation for hybrid systems: applications to aircraft tracking I. Hwang, H of a stochastic linear hybrid system, given only the continuous system output data, is studied. Well established techniques for hybrid estimation, known as the multiple model adaptive estimation algorithm

  15. Ion-neutral sympathetic cooling in a hybrid linear rf Paul and magneto-optical trap

    E-Print Network [OSTI]

    Goodman, D S; Wells, J E; Narducci, F A; Smith, W W

    2012-01-01

    Long range polarization forces between ions and neutral atoms result in large elastic scattering cross sections, e.g., 10^6 a.u. for Na+ on Na or Ca+ on Na at cold and ultracold temperatures. This suggests that a hybrid ion-neutral trap should offer a general means for significant sympathetic cooling of atomic or molecular ions. We present SIMION 7.0 simulation results concerning the advantages and limitations of sympathetic cooling within a hybrid trap apparatus, consisting of a linear rf Paul trap concentric with a Na magneto-optical trap (MOT). This paper explores the impact of various heating mechanisms on the hybrid system and how parameters related to the MOT, Paul trap, number of ions, and ion species affect the efficiency of the sympathetic cooling.

  16. Ion-neutral sympathetic cooling in a hybrid linear rf Paul and magneto-optical trap

    E-Print Network [OSTI]

    D. S. Goodman; I. Sivarajah; J. E. Wells; F. A. Narducci; W. W. Smith

    2012-08-31

    Long range polarization forces between ions and neutral atoms result in large elastic scattering cross sections, e.g., 10^6 a.u. for Na+ on Na or Ca+ on Na at cold and ultracold temperatures. This suggests that a hybrid ion-neutral trap should offer a general means for significant sympathetic cooling of atomic or molecular ions. We present SIMION 7.0 simulation results concerning the advantages and limitations of sympathetic cooling within a hybrid trap apparatus, consisting of a linear rf Paul trap concentric with a Na magneto-optical trap (MOT). This paper explores the impact of various heating mechanisms on the hybrid system and how parameters related to the MOT, Paul trap, number of ions, and ion species affect the efficiency of the sympathetic cooling.

  17. Process Cooling Systems 

    E-Print Network [OSTI]

    McCann, C. J.

    1983-01-01

    Cooling towers have been on the scene for more than 50 years. It is because they have proven to be an economic choice for waste heat dissipation. But it seems, for some reason, that after installation very little attention is paid to the cooling...

  18. Solar Central Receiver Hybrid Power Systems sodium-cooled receiver concept. Final report. Volume II, Book 2. Conceptual design, Sections 5 and 6

    SciTech Connect (OSTI)

    None

    1980-01-01

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

  19. Desiccant Cooling Systems - A Review 

    E-Print Network [OSTI]

    Kettleborough, C. F.; Ullah, M. R.; Waugaman, D. G.

    1986-01-01

    Desiccant cooling systems have been investigated extensively during the past decade as alternatives to electrically driven vapor compression systems because regeneration temperatures of the desiccant - about 160°F, can be achieved using natural gas...

  20. Temperature initiated passive cooling system

    DOE Patents [OSTI]

    Forsberg, C.W.

    1994-11-01

    A passive cooling system for cooling an enclosure only when the enclosure temperature exceeds a maximum standby temperature comprises a passive heat transfer loop containing heat transfer fluid having a particular thermodynamic critical point temperature just above the maximum standby temperature. An upper portion of the heat transfer loop is insulated to prevent two phase operation below the maximum standby temperature. 1 fig.

  1. Temperature initiated passive cooling system

    DOE Patents [OSTI]

    Forsberg, Charles W. (Oak Ridge, TN)

    1994-01-01

    A passive cooling system for cooling an enclosure only when the enclosure temperature exceeds a maximum standby temperature comprises a passive heat transfer loop containing heat transfer fluid having a particular thermodynamic critical point temperature just above the maximum standby temperature. An upper portion of the heat transfer loop is insulated to prevent two phase operation below the maximum standby temperature.

  2. Combustor liner cooling system

    DOE Patents [OSTI]

    Lacy, Benjamin Paul; Berkman, Mert Enis

    2013-08-06

    A combustor liner is disclosed. The combustor liner includes an upstream portion, a downstream end portion extending from the upstream portion along a generally longitudinal axis, and a cover layer associated with an inner surface of the downstream end portion. The downstream end portion includes the inner surface and an outer surface, the inner surface defining a plurality of microchannels. The downstream end portion further defines a plurality of passages extending between the inner surface and the outer surface. The plurality of microchannels are fluidly connected to the plurality of passages, and are configured to flow a cooling medium therethrough, cooling the combustor liner.

  3. Solar Central Receiver Hybrid Power Systems sodium-cooled receiver concept. Final report. Volume II, Book 1. Conceptual design, Sections 1 through 4

    SciTech Connect (OSTI)

    1980-01-01

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

  4. Non-intrusive cooling system

    DOE Patents [OSTI]

    Morrison, Edward F. (Burnt Hills, NY); Bergman, John W. (Barrington, NH)

    2001-05-22

    A readily replaceable heat exchange cooling jacket for applying fluid to a system conduit pipe. The cooling jacket comprises at least two members, separable into upper and lower portions. A chamber is formed between the conduit pipe and cooling jacket once the members are positioned about the pipe. The upper portion includes a fluid spray means positioned above the pipe and the bottom portion includes a fluid removal means. The heat exchange cooling jacket is adaptable with a drain tank, a heat exchanger, a pump and other standard equipment to provide a system for removing heat from a pipe. A method to remove heat from a pipe, includes the steps of enclosing a portion of the pipe with a jacket to form a chamber between an outside surface of the pipe and the cooling jacket; spraying cooling fluid at low pressure from an upper portion of the cooling jacket, allowing the fluid to flow downwardly by gravity along the surface of the pipe toward a bottom portion of the chamber; and removing the fluid at the bottom portion of the chamber.

  5. Remote hybrid power systems

    SciTech Connect (OSTI)

    Barley, C.D.; Winn, C.B. [Colorado State Univ., Fort Collins, CO (United States)

    1997-12-31

    This paper provides an overview of the emerging technology of remote, stand-alone electrical power systems featuring a renewable source (wind or photovoltaics [PV]) as well as a diesel generator, with or without an energy storage device. Other stand-alone power systems are discussed briefly, mainly to emphasize the domain of hybrid systems. The history of hybrid systems is reviewed, beginning with the first wind/diesel system in the late 1970s. Other topics include issues arising from the characteristics of diesel engine/generator sets; simple vs. complex systems; the various energy storage technologies that have been used or proposed; control strategies; modeling; optimization; and some {open_quotes}nuts & bolts{close_quotes} details. The bibliography includes over 130 references which are cited throughout the topical discussions. It is concluded that the technical feasibility of hybrid systems has been demonstrated through many prototype installations, and that areas for further improvements include higher reliability and more economical energy storage devices. 139 refs., 7 figs., 1 tab.

  6. Compressor bleed cooling fluid feed system

    DOE Patents [OSTI]

    Donahoo, Eric E; Ross, Christopher W

    2014-11-25

    A compressor bleed cooling fluid feed system for a turbine engine for directing cooling fluids from a compressor to a turbine airfoil cooling system to supply cooling fluids to one or more airfoils of a rotor assembly is disclosed. The compressor bleed cooling fluid feed system may enable cooling fluids to be exhausted from a compressor exhaust plenum through a downstream compressor bleed collection chamber and into the turbine airfoil cooling system. As such, the suction created in the compressor exhaust plenum mitigates boundary layer growth along the inner surface while providing flow of cooling fluids to the turbine airfoils.

  7. Solar-powered cooling system

    DOE Patents [OSTI]

    Farmer, Joseph C

    2013-12-24

    A solar-powered adsorption-desorption refrigeration and air conditioning system uses nanostructural materials made of high specific surface area adsorption aerogel as the adsorptive media. Refrigerant molecules are adsorbed on the high surface area of the nanostructural material. A circulation system circulates refrigerant from the nanostructural material to a cooling unit.

  8. DRAFT INTERIM REPORT: NATIONAL PROGRAM PLAN FOR PASSIVE AND HYBRID SOLAR HEATING AND COOLING

    E-Print Network [OSTI]

    Authors, Various

    2012-01-01

    heat exchangers, hybrid components such as fans and pumps,for fans, pumps, and valves used in hybrid systems; heat

  9. Indirect passive cooling system for liquid metal cooled nuclear reactors

    DOE Patents [OSTI]

    Hunsbedt, Anstein (Los Gatos, CA); Boardman, Charles E. (Saratoga, CA)

    1990-01-01

    A liquid metal cooled nuclear reactor having a passive cooling system for removing residual heat resulting from fuel decay during reactor shutdown. The passive cooling system comprises a plurality of partitions surrounding the reactor vessel in spaced apart relation forming intermediate areas for circulating heat transferring fluid which remove and carry away heat from the reactor vessel. The passive cooling system includes a closed primary fluid circuit through the partitions surrounding the reactor vessel and a partially adjoining secondary open fluid circuit for carrying transferred heat out into the atmosphere.

  10. Passive cooling safety system for liquid metal cooled nuclear reactors

    DOE Patents [OSTI]

    Hunsbedt, Anstein (Los Gatos, CA); Boardman, Charles E. (Saratoga, CA); Hui, Marvin M. (Sunnyvale, CA); Berglund, Robert C. (Saratoga, CA)

    1991-01-01

    A liquid metal cooled nuclear reactor having a passive cooling system for removing residual heat resulting from fuel decay during reactor shutdown. The passive cooling system comprises a plurality of partitions surrounding the reactor vessel in spaced apart relation forming intermediate areas for circulating heat transferring fluid which remove and carry away heat from the reactor vessel. The passive cooling system includes a closed primary fluid circuit through the partitions surrounding the reactor vessel and a partially adjoining secondary open fluid circuit for carrying transferred heat out into the atmosphere.

  11. Cooling system for electronic components

    DOE Patents [OSTI]

    Anderl, William James; Colgan, Evan George; Gerken, James Dorance; Marroquin, Christopher Michael; Tian, Shurong

    2015-12-15

    Embodiments of the present invention provide for non interruptive fluid cooling of an electronic enclosure. One or more electronic component packages may be removable from a circuit card having a fluid flow system. When installed, the electronic component packages are coincident to and in a thermal relationship with the fluid flow system. If a particular electronic component package becomes non-functional, it may be removed from the electronic enclosure without affecting either the fluid flow system or other neighboring electronic component packages.

  12. Lamination cooling system formation method

    DOE Patents [OSTI]

    Rippel, Wally E. (Altadena, CA); Kobayashi, Daryl M. (Monrovia, CA)

    2012-06-19

    An electric motor, transformer or inductor having a cooling system. A stack of laminations have apertures at least partially coincident with apertures of adjacent laminations. The apertures define straight or angled cooling-fluid passageways through the lamination stack. Gaps between the adjacent laminations are sealed by injecting a heat-cured sealant into the passageways, expelling excess sealant, and heat-curing the lamination stack. Manifold members adjoin opposite ends of the lamination stack, and each is configured with one or more cavities to act as a manifold to adjacent passageway ends. Complex manifold arrangements can create bidirectional flow in a variety of patterns.

  13. Lamination cooling system formation method

    DOE Patents [OSTI]

    Rippel, Wally E [Altadena, CA; Kobayashi, Daryl M [Monrovia, CA

    2009-05-12

    An electric motor, transformer or inductor having a cooling system. A stack of laminations have apertures at least partially coincident with apertures of adjacent laminations. The apertures define straight or angled cooling-fluid passageways through the lamination stack. Gaps between the adjacent laminations are sealed by injecting a heat-cured sealant into the passageways, expelling excess sealant, and heat-curing the lamination stack. Manifold members adjoin opposite ends of the lamination stack, and each is configured with one or more cavities to act as a manifold to adjacent passageway ends. Complex manifold arrangements can create bidirectional flow in a variety of patterns.

  14. Gas hydrate cool storage system

    DOE Patents [OSTI]

    Ternes, M.P.; Kedl, R.J.

    1984-09-12

    The invention presented relates to the development of a process utilizing a gas hydrate as a cool storage medium for alleviating electric load demands during peak usage periods. Several objectives of the invention are mentioned concerning the formation of the gas hydrate as storage material in a thermal energy storage system within a heat pump cycle system. The gas hydrate was formed using a refrigerant in water and an example with R-12 refrigerant is included. (BCS)

  15. A Possible Hybrid Cooling Channel for a Neutrino Factory

    E-Print Network [OSTI]

    Juan C. Gallardo; Michael S. Zisman

    2010-05-18

    A Neutrino Factory requires an intense and well-cooled (in transverse phase space) muon beam. We discuss a hybrid approach for a linear 4D cooling channel consisting of high-pressure gas-filled RF cavities- potentially allowing high gradients without breakdown- and discrete LiH absorbers to provide the necessary energy loss that results in the required muon beam cooling. We report simulations of the channel performance and its comparison with the vacuum case; we also briefly discuss technical and safety issues associated with cavities filled with high-pressure hydrogen gas. Even with additional windows that might be needed for safety reasons, the channel performance is comparable to that of the original, all-vacuum Feasibility Study 2a channel on which our design is based. If tests demonstrate that the gas-filled RF cavities can operate effectively with an intense beam of ionizing particles passing through them, our approach would be an attractive way of avoiding possible breakdown problems with a vacuum RF channel.

  16. Hybrid Automata-based CEGAR for Rectangular Hybrid Systems

    E-Print Network [OSTI]

    Liberzon, Daniel

    Hybrid Automata-based CEGAR for Rectangular Hybrid Systems Pavithra Prabhakar, Sridhar Duggirala- example guided abstraction-refinement (CEGAR) for systems modelled as rectangular hybrid automata. The main difference, between our ap- proach and previous proposals for CEGAR for hybrid automata

  17. Hybrid Cooling for Geothermal Power Plants: Final ARRA Project Report

    SciTech Connect (OSTI)

    Bharathan, D.

    2013-06-01

    Many binary-cycle geothermal plants use air as the heat rejection medium. Usually this is accomplished by using an air-cooled condenser (ACC) system to condense the vapor of the working fluid in the cycle. Many air-cooled plants suffer a loss of production capacity of up to 50% during times of high ambient temperatures. Use of limited amounts of water to supplement the performance of ACCs is investigated. Deluge cooling is found to be one of the least-cost options. Limiting the use of water in such an application to less than one thousand operating hours per year can boost plant output during critical high-demand periods while minimizing water use in binary-cycle geothermal power plants.

  18. Global optimization of hybrid systems

    E-Print Network [OSTI]

    Lee, Cha Kun

    2006-01-01

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

  19. Cooling system for superconducting magnet

    DOE Patents [OSTI]

    Gamble, Bruce B. (Wellesley, MA); Sidi-Yekhlef, Ahmed (Framingham, MA)

    1998-01-01

    A cooling system is configured to control the flow of a refrigerant by controlling the rate at which the refrigerant is heated, thereby providing an efficient and reliable approach to cooling a load (e.g., magnets, rotors). The cooling system includes a conduit circuit connected to the load and within which a refrigerant circulates; a heat exchanger, connected within the conduit circuit and disposed remotely from the load; a first and a second reservoir, each connected within the conduit, each holding at least a portion of the refrigerant; a heater configured to independently heat the first and second reservoirs. In a first mode, the heater heats the first reservoir, thereby causing the refrigerant to flow from the first reservoir through the load and heat exchanger, via the conduit circuit and into the second reservoir. In a second mode, the heater heats the second reservoir to cause the refrigerant to flow from the second reservoir through the load and heat exchanger via the conduit circuit and into the first reservoir.

  20. Cooling system for superconducting magnet

    DOE Patents [OSTI]

    Gamble, B.B.; Sidi-Yekhlef, A.

    1998-12-15

    A cooling system is configured to control the flow of a refrigerant by controlling the rate at which the refrigerant is heated, thereby providing an efficient and reliable approach to cooling a load (e.g., magnets, rotors). The cooling system includes a conduit circuit connected to the load and within which a refrigerant circulates; a heat exchanger, connected within the conduit circuit and disposed remotely from the load; a first and a second reservoir, each connected within the conduit, each holding at least a portion of the refrigerant; a heater configured to independently heat the first and second reservoirs. In a first mode, the heater heats the first reservoir, thereby causing the refrigerant to flow from the first reservoir through the load and heat exchanger, via the conduit circuit and into the second reservoir. In a second mode, the heater heats the second reservoir to cause the refrigerant to flow from the second reservoir through the load and heat exchanger via the conduit circuit and into the first reservoir. 3 figs.

  1. Cooling load differences between radiant and air systems

    E-Print Network [OSTI]

    Feng, Jingjuan Dove; Schiavon, Stefano; Bauman, Fred

    2013-01-01

    radiant heating and cooling systems, in: Proceedings ofSizing of the radiant system cooling equipment is highlycooling rate and air system cooling rate in this section. To

  2. Design and Control of Hydronic Radiant Cooling Systems

    E-Print Network [OSTI]

    Feng, Jingjuan

    2014-01-01

    embedded heating and cooling systems. Brussels, Belgium,radiant heating and cooling systems. Proceedings of Climaradiant heating and cooling systems: integration with a

  3. Critical review of water based radiant cooling system design methods

    E-Print Network [OSTI]

    Feng, Jingjuan Dove; Bauman, Fred; Schiavon, Stefano

    2014-01-01

    shown that radiant system cooling capacity could be enhancedof trends regarding radiant system cooling load analysis andEmbedded Radiant Heating and Cooling Systems, International

  4. Design and Control of Hydronic Radiant Cooling Systems

    E-Print Network [OSTI]

    Feng, Jingjuan Dove

    2014-01-01

    embedded heating and cooling systems. Brussels, Belgium,radiant heating and cooling systems. Proceedings of Climaof Slab Heating and Cooling Systems Studied by Dynamic

  5. Hybrid spread spectrum radio system

    DOE Patents [OSTI]

    Smith, Stephen F. (London, TN) [London, TN; Dress, William B. (Camas, WA) [Camas, WA

    2010-02-09

    Systems and methods are described for hybrid spread spectrum radio systems. A method, includes receiving a hybrid spread spectrum signal including: fast frequency hopping demodulating and direct sequence demodulating a direct sequence spread spectrum signal, wherein multiple frequency hops occur within a single data-bit time and each bit is represented by chip transmissions at multiple frequencies.

  6. Hybrid powertrain system

    DOE Patents [OSTI]

    Grillo, Ricardo C.; O'Neil, Walter K.; Preston, David M.

    2005-09-20

    A hybrid powertrain system is provided that includes a first prime mover having a rotational output, a second prime mover having a rotational output, and a transmission having a main shaft supporting at least two main shaft gears thereon. The transmission includes a first independent countershaft drivingly connected to the first prime mover and including at least one ratio gear supported thereon that meshes with a respective main shaft gear. A second independent countershaft is drivingly connected to the second prime mover and includes at least one ratio gear supported thereon that meshes with a respective main shaft gear. The ratio gears on the first and second countershafts cooperate with the main shaft gears to provide at least one gear ratio between the first and second countershafts and the main shaft. A shift control mechanism selectively engages and disengages the first and second countershafts for rotation with the main shaft.

  7. Thermal Storage with Conventional Cooling Systems 

    E-Print Network [OSTI]

    Kieninger, R. T.

    1994-01-01

    simple thermal energy storage system that already exists in almost every structure - concrete. Thermal storage calculations simulate sub-cooling of a building's structure during unoccupied times. During occupied times, the sub-cooled concrete reduces peak...

  8. Evaporative cooling enhanced cold storage system

    DOE Patents [OSTI]

    Carr, P.

    1991-10-15

    The invention provides an evaporatively enhanced cold storage system wherein a warm air stream is cooled and the cooled air stream is thereafter passed into contact with a cold storage unit. Moisture is added to the cooled air stream prior to or during contact of the cooled air stream with the cold storage unit to effect enhanced cooling of the cold storage unit due to evaporation of all or a portion of the added moisture. Preferably at least a portion of the added moisture comprises water condensed during the cooling of the warm air stream. 3 figures.

  9. Evaporative cooling enhanced cold storage system

    DOE Patents [OSTI]

    Carr, Peter (Cary, NC)

    1991-01-01

    The invention provides an evaporatively enhanced cold storage system wherein a warm air stream is cooled and the cooled air stream is thereafter passed into contact with a cold storage unit. Moisture is added to the cooled air stream prior to or during contact of the cooled air stream with the cold storage unit to effect enhanced cooling of the cold storage unit due to evaporation of all or a portion of the added moisture. Preferably at least a portion of the added moisture comprises water condensed during the cooling of the warm air stream.

  10. Performance Evaluation for Modular, Scalable Overhead Cooling Systems In Data Centers

    E-Print Network [OSTI]

    Xu, TengFang T.

    2009-01-01

    overhead cooling system Cooling system. The cooling systemTHE CHARACTERISTICS OF MODULAR, SCALABLE COOLING SYSTEMS ANDmodular, scalable cooling systems and servers 3.1 Modular,

  11. High temperature cooling system and method

    DOE Patents [OSTI]

    Loewen, Eric P.

    2006-12-12

    A method for cooling a heat source, a method for preventing chemical interaction between a vessel and a cooling composition therein, and a cooling system. The method for cooling employs a containment vessel with an oxidizable interior wall. The interior wall is oxidized to form an oxide barrier layer thereon, the cooling composition is monitored for excess oxidizing agent, and a reducing agent is provided to eliminate excess oxidation. The method for preventing chemical interaction between a vessel and a cooling composition involves introducing a sufficient quantity of a reactant which is reactive with the vessel in order to produce a barrier layer therein that is non-reactive with the cooling composition. The cooling system includes a containment vessel with oxidizing agent and reducing agent delivery conveyances and a monitor of oxidation and reduction states so that proper maintenance of a vessel wall oxidation layer occurs.

  12. Hybrid solar lighting distribution systems and components

    DOE Patents [OSTI]

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

    2011-07-05

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

  13. Hybrid solar lighting systems and components

    DOE Patents [OSTI]

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

    2007-06-12

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

  14. Radiant vessel auxiliary cooling system

    DOE Patents [OSTI]

    Germer, John H. (San Jose, CA)

    1987-01-01

    In a modular liquid-metal pool breeder reactor, a radiant vessel auxiliary cooling system is disclosed for removing the residual heat resulting from the shutdown of a reactor by a completely passive heat transfer system. A shell surrounds the reactor and containment vessel, separated from the containment vessel by an air passage. Natural circulation of air is provided by air vents at the lower and upper ends of the shell. Longitudinal, radial and inwardly extending fins extend from the shell into the air passage. The fins are heated by radiation from the containment vessel and convect the heat to the circulating air. Residual heat from the primary reactor vessel is transmitted from the reactor vessel through an inert gas plenum to a guard or containment vessel designed to contain any leaking coolant. The containment vessel is conventional and is surrounded by the shell.

  15. Solar-powered cooling system

    DOE Patents [OSTI]

    Farmer, Joseph C.

    2015-07-28

    A solar-powered adsorption-desorption refrigeration and air conditioning system that uses nanostructural materials such as aerogels, zeolites, and sol gels as the adsorptive media. Refrigerant molecules are adsorbed on the high surface area of the nanostructural material while the material is at a relatively low temperature, perhaps at night. During daylight hours, when the nanostructural materials is heated by the sun, the refrigerant are thermally desorbed from the surface of the aerogel, thereby creating a pressurized gas phase in the vessel that contains the aerogel. This solar-driven pressurization forces the heated gaseous refrigerant through a condenser, followed by an expansion valve. In the condenser, heat is removed from the refrigerant, first by circulating air or water. Eventually, the cooled gaseous refrigerant expands isenthalpically through a throttle valve into an evaporator, in a fashion similar to that in more conventional vapor recompression systems.

  16. Reactor core isolation cooling system

    DOE Patents [OSTI]

    Cooke, F.E.

    1992-12-08

    A reactor core isolation cooling system includes a reactor pressure vessel containing a reactor core, a drywell vessel, a containment vessel, and an isolation pool containing an isolation condenser. A turbine is operatively joined to the pressure vessel outlet steamline and powers a pump operatively joined to the pressure vessel feedwater line. In operation, steam from the pressure vessel powers the turbine which in turn powers the pump to pump makeup water from a pool to the feedwater line into the pressure vessel for maintaining water level over the reactor core. Steam discharged from the turbine is channeled to the isolation condenser and is condensed therein. The resulting heat is discharged into the isolation pool and vented to the atmosphere outside the containment vessel for removing heat therefrom. 1 figure.

  17. Reactor core isolation cooling system

    DOE Patents [OSTI]

    Cooke, Franklin E. (San Jose, CA)

    1992-01-01

    A reactor core isolation cooling system includes a reactor pressure vessel containing a reactor core, a drywell vessel, a containment vessel, and an isolation pool containing an isolation condenser. A turbine is operatively joined to the pressure vessel outlet steamline and powers a pump operatively joined to the pressure vessel feedwater line. In operation, steam from the pressure vessel powers the turbine which in turn powers the pump to pump makeup water from a pool to the feedwater line into the pressure vessel for maintaining water level over the reactor core. Steam discharged from the turbine is channeled to the isolation condenser and is condensed therein. The resulting heat is discharged into the isolation pool and vented to the atmosphere outside the containment vessel for removing heat therefrom.

  18. Emergency cooling system and method

    DOE Patents [OSTI]

    Oosterkamp, W.J.; Cheung, Y.K.

    1994-01-04

    An improved emergency cooling system and method are disclosed that may be adapted for incorporation into or use with a nuclear BWR wherein a reactor pressure vessel (RPV) containing a nuclear core and a heat transfer fluid for circulation in a heat transfer relationship with the core is housed within an annular sealed drywell and is fluid communicable therewith for passage thereto in an emergency situation the heat transfer fluid in a gaseous phase and any noncondensibles present in the RPV, an annular sealed wetwell houses the drywell, and a pressure suppression pool of liquid is disposed in the wetwell and is connected to the drywell by submerged vents. The improved emergency cooling system and method has a containment condenser for receiving condensible heat transfer fluid in a gaseous phase and noncondensibles for condensing at least a portion of the heat transfer fluid. The containment condenser has an inlet in fluid communication with the drywell for receiving heat transfer fluid and noncondensibles, a first outlet in fluid communication with the RPV for the return to the RPV of the condensed portion of the heat transfer fluid and a second outlet in fluid communication with the drywell for passage of the noncondensed balance of the heat transfer fluid and the noncondensibles. The noncondensed balance of the heat transfer fluid and the noncondensibles passed to the drywell from the containment condenser are mixed with the heat transfer fluid and the noncondensibles from the RPV for passage into the containment condenser. A water pool is provided in heat transfer relationship with the containment condenser and is thermally communicable in an emergency situation with an environment outside of the drywell and the wetwell for conducting heat transferred from the containment condenser away from the wetwell and the drywell. 5 figs.

  19. Cooling load differences between radiant and air systems

    E-Print Network [OSTI]

    Feng, Jingjuan Dove; Schiavon, Stefano; Bauman, Fred

    2013-01-01

    radiant heating and cooling systems, in: Proceedings ofInc, Altanta,GA, 2009. Cooling load differences betweensurface level 24-hour total cooling energy between radiant

  20. Liquid metal cooled nuclear reactor plant system

    DOE Patents [OSTI]

    Hunsbedt, Anstein (Los Gatos, CA); Boardman, Charles E. (Saratoga, CA)

    1993-01-01

    A liquid metal cooled nuclear reactor having a passive cooling system for removing residual heat resulting for fuel decay during reactor shutdown, or heat produced during a mishap. The reactor system is enhanced with sealing means for excluding external air from contact with the liquid metal coolant leaking from the reactor vessel during an accident. The invention also includes a silo structure which resists attack by leaking liquid metal coolant, and an added unique cooling means.

  1. Distributed Theorem Proving for Distributed Hybrid Systems

    E-Print Network [OSTI]

    Platzer, André

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

  2. Performance of a hybrid ground-coupled heat pump system

    SciTech Connect (OSTI)

    Phetteplace, G.; Sullivan, W.

    1998-10-01

    In climates dominated by air conditioning, a few so-called hybrid ground-coupled heat pump (GCHP) systems have been built. The hybrid system uses both a ground-coupled heat exchanger and a cooling tower, thereby reducing the amount of ground-coupling heat exchanger necessary. Although this concept has been shown to be feasible, the performance of such a system has not been measured in detail. Since it may be possible to achieve significant performance improvements in such systems by modifying the design and operational practices, detailed performance monitoring of such systems is needed. This paper describes a project that has been undertaken to collect performance data from a hybrid GCHP system at Fort Polk, LA. This paper presents performance data for a period of about 22 months, including data from portions of two heating and cooling seasons. The energy input to the GCHPs themselves will be presented, as well as the energy rejected to the ground in the cooling mode and that extracted from the ground in the heating mode. Energy flows in the cooling tower also will be addressed, along with the power consumption of the circulating pumps and the cooling tower.

  3. Evaluation of cooling performance of thermally activated building system with evaporative cooling source for typical United States climates

    E-Print Network [OSTI]

    Feng, Jingjuan; Bauman, Fred

    2013-01-01

    embedded surface cooling system and TABS systems THERMALwas simulated. The radiant cooling system was an exposedcooling + radiant cooling system alone may not be able to

  4. Hot gas path component cooling system

    DOE Patents [OSTI]

    Lacy, Benjamin Paul; Bunker, Ronald Scott; Itzel, Gary Michael

    2014-02-18

    A cooling system for a hot gas path component is disclosed. The cooling system may include a component layer and a cover layer. The component layer may include a first inner surface and a second outer surface. The second outer surface may define a plurality of channels. The component layer may further define a plurality of passages extending generally between the first inner surface and the second outer surface. Each of the plurality of channels may be fluidly connected to at least one of the plurality of passages. The cover layer may be situated adjacent the second outer surface of the component layer. The plurality of passages may be configured to flow a cooling medium to the plurality of channels and provide impingement cooling to the cover layer. The plurality of channels may be configured to flow cooling medium therethrough, cooling the cover layer.

  5. Hybrid Systems: From Verification to Falsification

    E-Print Network [OSTI]

    Kavraki, Lydia E.

    Hybrid Systems: From Verification to Falsification Erion Plaku, Lydia E. Kavraki, and Moshe Y}@cs.rice.edu Abstract. We propose HyDICE, Hybrid DIscrete Continuous Exploration, a multi-layered approach for hybrid. The discrete search uses the discrete transitions of the hybrid system and coarse-grained decompositions

  6. Cooling system for a nuclear reactor

    DOE Patents [OSTI]

    Amtmann, Hans H. (Rancho Santa Fe, CA)

    1982-01-01

    A cooling system for a gas-cooled nuclear reactor is disclosed which includes at least one primary cooling loop adapted to pass coolant gas from the reactor core and an associated steam generator through a duct system having a main circulator therein, and at least one auxiliary cooling loop having communication with the reactor core and adapted to selectively pass coolant gas through an auxiliary heat exchanger and circulator. The main and auxiliary circulators are installed in a common vertical cavity in the reactor vessel, and a common return duct communicates with the reactor core and intersects the common cavity at a junction at which is located a flow diverter valve operative to effect coolant flow through either the primary or auxiliary cooling loops.

  7. Effectiveness-weighted control method for a cooling system

    DOE Patents [OSTI]

    Campbell, Levi A.; Chu, Richard C.; David, Milnes P.; Ellsworth Jr., Michael J.; Iyengar, Madhusudan K.; Schmidt, Roger R.; Simons, Robert E.

    2015-12-15

    Energy efficient control of cooling system cooling of an electronic system is provided based, in part, on weighted cooling effectiveness of the components. The control includes automatically determining speed control settings for multiple adjustable cooling components of the cooling system. The automatically determining is based, at least in part, on weighted cooling effectiveness of the components of the cooling system, and the determining operates to limit power consumption of at least the cooling system, while ensuring that a target temperature associated with at least one of the cooling system or the electronic system is within a desired range by provisioning, based on the weighted cooling effectiveness, a desired target temperature change among the multiple adjustable cooling components of the cooling system. The provisioning includes provisioning applied power to the multiple adjustable cooling components via, at least in part, the determined control settings.

  8. Effectiveness-weighted control of cooling system components

    DOE Patents [OSTI]

    Campbell, Levi A.; Chu, Richard C.; David, Milnes P.; Ellsworth Jr., Michael J.; Iyengar, Madhusudan K.; Schmidt, Roger R.; Simmons, Robert E.

    2015-12-22

    Energy efficient control of cooling system cooling of an electronic system is provided based, in part, on weighted cooling effectiveness of the components. The control includes automatically determining speed control settings for multiple adjustable cooling components of the cooling system. The automatically determining is based, at least in part, on weighted cooling effectiveness of the components of the cooling system, and the determining operates to limit power consumption of at least the cooling system, while ensuring that a target temperature associated with at least one of the cooling system or the electronic system is within a desired range by provisioning, based on the weighted cooling effectiveness, a desired target temperature change among the multiple adjustable cooling components of the cooling system. The provisioning includes provisioning applied power to the multiple adjustable cooling components via, at least in part, the determined control settings.

  9. GentleCool: Cooling Aware Proactive Workload Scheduling in Multi-Machine Systems

    E-Print Network [OSTI]

    Simunic, Tajana

    GentleCool: Cooling Aware Proactive Workload Scheduling in Multi-Machine Systems Raid Ayoub characteristics of the workload running on the system. We propose a scheduling framework called GentleCool, a proactive multi-tier approach for significantly lowering the fan cooling costs in highly utilized systems

  10. CONTROL SYSTEM FOR SOLAR HEATING and COOLING

    E-Print Network [OSTI]

    Dols, C.

    2010-01-01

    solar heated, boosted, or heated entirely in the auxiliary heater)for the solar-heated hot water. This heater can be seen insolar heating and cooling system, showing plumbing runs containing solenoid valves, auxiliary heater (

  11. CONTROL SYSTEM FOR SOLAR HEATING and COOLING

    E-Print Network [OSTI]

    Dols, C.

    2010-01-01

    LBL buildings, with the solar collectors on the roof, theCBB 757-5496 Figure 3: Solar Collectors Mounted· on the RoofSolar Heating and Cooling Systems. The components include Collectors (

  12. NASA Marshall Space Flight Center Improves Cooling System Performance...

    Office of Environmental Management (EM)

    Marshall Space Flight Center Improves Cooling System Performance NASA Marshall Space Flight Center Improves Cooling System Performance NASA Marshall Space Flight Center Improves...

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

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

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

  14. Modeling and Analysis ofModeling and Analysis of Hybrid Control SystemsHybrid Control Systems

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    Modeling and Analysis ofModeling and Analysis of Hybrid Control SystemsHybrid Control Systems Karl.kth.se/~kallej MOVEP 2006, Bordeaux, France Karl H. Johansson, Hybrid control systems, MOVEP, Bordeaux on commands and autonomous actions #12;Karl H. Johansson, Hybrid control systems, MOVEP, Bordeaux, 2006

  15. The integration of cryogenic cooling systems with superconducting electronic systems

    E-Print Network [OSTI]

    Green, Michael A.

    2011-01-01

    applications for superconductivity have low heat loads in aTransactions on Applied Superconductivity t I, P 2615, (Cooling Systems With Superconducting Electronic Systems M.

  16. Gas hydrate cool storage system

    DOE Patents [OSTI]

    Ternes, Mark P. (Knoxville, TN); Kedl, Robert J. (Oak Ridge, TN)

    1985-01-01

    This invention is a process for formation of a gas hydrate to be used as a cool storage medium using a refrigerant in water. Mixing of the immiscible refrigerant and water is effected by addition of a surfactant and agitation. The difficult problem of subcooling during the process is overcome by using the surfactant and agitation and performance of the process significantly improves and approaches ideal.

  17. Experimental comparison of zone cooling load between radiant and air systems

    E-Print Network [OSTI]

    Feng, Jingjuan Dove; Bauman, Fred; Schiavon, Stefano

    2014-01-01

    be used for radiant system cooling load, which should beKeyword Radiant Cooling System, Cooling load, Air system,guidance on radiant system cooling load prediction and

  18. System Simulations of Hybrid Electric Vehicles with Focus on...

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

    System Simulations of Hybrid Electric Vehicles with Focus on Emissions System Simulations of Hybrid Electric Vehicles with Focus on Emissions Comparative simulations of hybrid...

  19. Passive cooling system for top entry liquid metal cooled nuclear reactors

    DOE Patents [OSTI]

    Boardman, Charles E. (Saratoga, CA); Hunsbedt, Anstein (Los Gatos, CA); Hui, Marvin M. (Cupertino, CA)

    1992-01-01

    A liquid metal cooled nuclear fission reactor plant having a top entry loop joined satellite assembly with a passive auxiliary safety cooling system for removing residual heat resulting from fuel decay during shutdown, or heat produced during a mishap. This satellite type reactor plant is enhanced by a backup or secondary passive safety cooling system which augments the primary passive auxiliary cooling system when in operation, and replaces the primary cooling system when rendered inoperative.

  20. Cavity cooling of an ensemble spin system

    E-Print Network [OSTI]

    Christopher J. Wood; Troy W. Borneman; David G. Cory

    2014-02-24

    We describe how sideband cooling techniques may be applied to large spin ensembles in magnetic resonance. Using the Tavis-Cummings model in the presence of a Rabi drive, we solve a Markovian master equation describing the joint spin-cavity dynamics to derive cooling rates as a function of ensemble size. Our calculations indicate that the coupled angular momentum subspaces of a spin ensemble containing roughly $10^{11}$ electron spins may be polarized in a time many orders of magnitude shorter than the typical thermal relaxation time. The described techniques should permit efficient removal of entropy for spin-based quantum information processors and fast polarization of spin samples. The proposed application of a standard technique in quantum optics to magnetic resonance also serves to reinforce the connection between the two fields, which has recently begun to be explored in further detail due to the development of hybrid designs for manufacturing noise-resilient quantum devices.

  1. Hybrid Radiator Cooling System | Argonne National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverse (JournalvivoHighHussein Khalil Hussein Khalil Director of

  2. Cooling system for continuous metal casting machines

    DOE Patents [OSTI]

    Draper, R.; Sumpman, W.C.; Baker, R.J.; Williams, R.S.

    1988-06-07

    A continuous metal caster cooling system is provided in which water is supplied in jets from a large number of small nozzles against the inner surface of rim at a temperature and with sufficient pressure that the velocity of the jets is sufficiently high that the mode of heat transfer is substantially by forced convection, the liquid being returned from the cooling chambers through return pipes distributed interstitially among the nozzles. 9 figs.

  3. Cooling system for continuous metal casting machines

    DOE Patents [OSTI]

    Draper, Robert (Churchill Boro, PA); Sumpman, Wayne C. (North Huntingdon, PA); Baker, Robert J. (Wilkins Township, Allegheny County, PA); Williams, Robert S. (Plum Borough, PA)

    1988-01-01

    A continuous metal caster cooling system is provided in which water is supplied in jets from a large number of small nozzles 19 against the inner surface of rim 13 at a temperature and with sufficient pressure that the velocity of the jets is sufficiently high that the mode of heat transfer is substantially by forced convection, the liquid being returned from the cooling chambers 30 through return pipes 25 distributed interstitially among the nozzles.

  4. Hybrid powertrain system

    DOE Patents [OSTI]

    Hughes, Douglas A. (Wixom, MI)

    2007-09-25

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

  5. Hybrid powertrain system

    DOE Patents [OSTI]

    Hughes, Douglas A.

    2006-08-01

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

  6. A verification framework for hybrid systems

    E-Print Network [OSTI]

    Mitra, Sayan

    2007-01-01

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

  7. Hybrid slab-microchannel gel electrophoresis system

    DOE Patents [OSTI]

    Balch, Joseph W. (Livermore, CA); Carrano, Anthony V. (Livermore, CA); Davidson, James C. (Livermore, CA); Koo, Jackson C. (San Ramon, CA)

    1998-01-01

    A hybrid slab-microchannel gel electrophoresis system. The hybrid system permits the fabrication of isolated microchannels for biomolecule separations without imposing the constraint of a totally sealed system. The hybrid system is reusable and ultimately much simpler and less costly to manufacture than a closed channel plate system. The hybrid system incorporates a microslab portion of the separation medium above the microchannels, thus at least substantially reducing the possibility of non-uniform field distribution and breakdown due to uncontrollable leakage. A microslab of the sieving matrix is built into the system by using plastic spacer materials and is used to uniformly couple the top plate with the bottom microchannel plate.

  8. Hybrid chirped pulse amplification system

    DOE Patents [OSTI]

    Barty, Christopher P.; Jovanovic, Igor

    2005-03-29

    A hybrid chirped pulse amplification system wherein a short-pulse oscillator generates an oscillator pulse. The oscillator pulse is stretched to produce a stretched oscillator seed pulse. A pump laser generates a pump laser pulse. The stretched oscillator seed pulse and the pump laser pulse are directed into an optical parametric amplifier producing an optical parametric amplifier output amplified signal pulse and an optical parametric amplifier output unconverted pump pulse. The optical parametric amplifier output amplified signal pulse and the optical parametric amplifier output laser pulse are directed into a laser amplifier producing a laser amplifier output pulse. The laser amplifier output pulse is compressed to produce a recompressed hybrid chirped pulse amplification pulse.

  9. Passive cooling system for a vehicle

    DOE Patents [OSTI]

    Hendricks, Terry Joseph; Thoensen, Thomas

    2005-11-15

    A passive cooling system for a vehicle (114) transfers heat from an overheated internal component, for example, an instrument panel (100), to an external portion (116) of the vehicle (114), for example, a side body panel (126). The passive cooling system includes one or more heat pipes (112) having an evaporator section (118) embedded in the overheated internal component and a condenser section (120) at the external portion (116) of the vehicle (114). The evaporator (118) and condenser (120) sections are in fluid communication. The passive cooling system may also include a thermally conductive film (140) for thermally connecting the evaporator sections (118) of the heat pipes (112) to each other and to the instrument panel (100).

  10. Passive Cooling System for a Vehicle

    DOE Patents [OSTI]

    Hendricks, T. J.; Thoensen, T.

    2005-11-15

    A passive cooling system for a vehicle (114) transfers heat from an overheated internal component, for example, an instrument panel (100), to an external portion (116) of the vehicle (114), for example, a side body panel (126). The passive cooling system includes one or more heat pipes (112) having an evaporator section (118) embedded in the overheated internal component and a condenser section (120) at the external portion (116) of the vehicle (114). The evaporator (118) and condenser (120) sections are in fluid communication. The passive cooling system may also include a thermally conductive film (140) for thermally connecting the evaporator sections (118) of the heat pipes (112) to each other and to the instrument panel (100).

  11. Hybrid spread spectrum radio system

    DOE Patents [OSTI]

    Smith, Stephen F. (London, TN); Dress, William B. (Camas, WA)

    2010-02-02

    Systems and methods are described for hybrid spread spectrum radio systems. A method includes modulating a signal by utilizing a subset of bits from a pseudo-random code generator to control an amplification circuit that provides a gain to the signal. Another method includes: modulating a signal by utilizing a subset of bits from a pseudo-random code generator to control a fast hopping frequency synthesizer; and fast frequency hopping the signal with the fast hopping frequency synthesizer, wherein multiple frequency hops occur within a single data-bit time.

  12. Measurement of Temperature Profile in the Reactor Cavity Cooling System 

    E-Print Network [OSTI]

    Alhashimi, Tariq Yaqoob Sayed

    2014-12-02

    -cooled Reactor Cavity Cooling System (RCCS) based on General Electric Modular High Temperature Gas Cooled Reactor (MHTGR) design to study the thermal hydraulic phenomena occurring in the upper plenum. The facility consists of four vertical parallel riser ducts...

  13. Optimization of hybrid-water/air-cooled condenser in an enhanced...

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

    objective: To improve the efficiency and output variability of geothermal-based ORC power production systems with minimal water consumption by deploying: 1) a hybrid-waterair...

  14. Process Cooling Pumping Systems Analysis 

    E-Print Network [OSTI]

    Sherman, C.

    2008-01-01

    An analysis of the mill water pumping systems at a North American manufacturing facility was conducted late las year and the following issues were observed: 1. Overpumping – Both systems were overpumped to a significant degree against...

  15. Passive cooling system for liquid metal cooled nuclear reactors with backup coolant flow path

    DOE Patents [OSTI]

    Hunsbedt, Anstein (Los Gatos, CA); Boardman, Charles E. (Saratoga, CA)

    1993-01-01

    A liquid metal cooled nuclear fission reactor plant having a passive auxiliary safety cooling system for removing residual heat resulting from fuel decay during reactor shutdown, or heat produced during a mishap. This reactor plant is enhanced by a backup or secondary passive safety cooling system which augments the primary passive auxiliary cooling system when in operation, and replaces the primary system when rendered inoperable.

  16. Thermodynamics cycle analysis and numerical modeling of thermoelastic cooling systems

    E-Print Network [OSTI]

    Rubloff, Gary W.

    Thermodynamics cycle analysis and numerical modeling of thermoelastic cooling systems Suxin Qian level. However, a thermoelastic cooling system integrated with heat transfer fluid loops have not been;2012) (a.k.a. elastocaloric cooling). These solid-state cooling systems offer us alternatives to eliminate

  17. Hybrid Cooling for Geothermal Power Plants: Final ARRA Project Report

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby aLED Street LightingFrom theHigh EfficiencyHotHybrid

  18. Hybrid and Advanced Air Cooling | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum12,ExecutiveFinancingR Walls - BuildingofDepartmentHybirdNDE MethodHybrid and

  19. Hybrid and Advanced Air Cooling | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum12,ExecutiveFinancingR Walls - BuildingofDepartmentHybirdNDE MethodHybrid andDOE

  20. Cool and Save: Cooling Aware Dynamic Workload Scheduling in Multi-socket CPU Systems

    E-Print Network [OSTI]

    Simunic, Tajana

    Cool and Save: Cooling Aware Dynamic Workload Scheduling in Multi-socket CPU Systems Raid Ayoub, dissipating the high temper- ature requires a large and energy hungry cooling system which increases the cost and fan control in multi-socket systems have been designed sep- arately leading to less efficient

  1. Quantum technologies with hybrid systems

    E-Print Network [OSTI]

    G. Kurizki; P. Bertet; Y. Kubo; K. Mølmer; D. Petrosyan; P. Rabl; J. Schmiedmayer

    2015-04-01

    An extensively pursued current direction of research in physics aims at the development of practical technologies that exploit the effects of quantum mechanics. As part of this ongoing effort, devices for information processing, secure communication and high-precision sensing are being implemented with diverse systems, ranging from photons, atoms and spins to mesoscopic superconducting and nanomechanical structures. Their physical properties make some of these systems better suited than others for specific tasks; thus, photons are well suited for transmitting quantum information, weakly interacting spins can serve as long-lived quantum memories, and superconducting elements can rapidly process information encoded in their quantum states. A central goal of the envisaged quantum technologies is to develop devices that can simultaneously perform several of these tasks, namely, reliably store, process, and transmit quantum information. Hybrid quantum systems composed of different physical components with complementary functionalities may provide precisely such multi-tasking capabilities. This article reviews some of the driving theoretical ideas and first experimental realizations of hybrid quantum systems and the opportunities and the challenges they present and offers a glance at the near- and long-term perspectives of this fascinating and rapidly expanding field.

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

    SciTech Connect (OSTI)

    2012-01-04

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

  3. Cooling load design tool for UFAD systems.

    E-Print Network [OSTI]

    Bauman, Fred; Schiavon, Stefano; Webster, Tom; Lee, Kwang Ho

    2010-01-01

    De- velopment of a Simplified Cooling Load Design Tool forand C. Benedek. 2007. “Cooling airflow design calculationscalculation method for design cooling loads in underfloor

  4. Combustion system for hybrid solar fossil fuel receiver

    DOE Patents [OSTI]

    Mehos, Mark S.; Anselmo, Kenneth M.; Moreno, James B.; Andraka, Charles E.; Rawlinson, K. Scott; Corey, John; Bohn, Mark S.

    2004-05-25

    A combustion system for a hybrid solar receiver comprises a pre-mixer which combines air and fuel to form an air-fuel mixture. The mixture is introduced tangentially into a cooling jacket. A burner plenum is fluidically connected to the cooling jacket such that the burner plenum and the cooling jacket are arranged in thermal contact with one another. The air-fuel mixture flows through the cooling jacket cooling the burner plenum to reduce pre-ignition of the air-fuel mixture in the burner plenum. A combustion chamber is operatively associated with and open to the burner plenum to receive the air-fuel mixture from the burner plenum. An igniter is operatively positioned in the combustion chamber to combust the air-fuel mixture, releasing heat. A recuperator is operatively associated with the burner plenum and the combustion chamber and pre-heats the air-fuel mixture in the burner plenum with heat from the combustion chamber. A heat-exchanger is operatively associated and in thermal contact with the combustion chamber. The heat-exchanger provides heat for the hybrid solar receiver.

  5. Cooling system for a gas turbine

    DOE Patents [OSTI]

    Wilson, Ian David (Mauldin, SC); Salamah, Samir Armando (Niskayuna, NY); Bylina, Noel Jacob (Niskayuna, NY)

    2003-01-01

    A plurality of arcuate circumferentially spaced supply and return manifold segments are arranged on the rim of a rotor for respectively receiving and distributing cooling steam through exit ports for distribution to first and second-stage buckets and receiving spent cooling steam from the first and second-stage buckets through inlet ports for transmission to axially extending return passages. Each of the supply and return manifold segments has a retention system for precluding substantial axial, radial and circumferential displacement relative to the rotor. The segments also include guide vanes for minimizing pressure losses in the supply and return of the cooling steam. The segments lie substantially equal distances from the centerline of the rotor and crossover tubes extend through each of the segments for communicating steam between the axially adjacent buckets of the first and second stages, respectively.

  6. Method of fabricating a cooled electronic system

    DOE Patents [OSTI]

    Chainer, Timothy J; Gaynes, Michael A; Graybill, David P; Iyengar, Madhusudan K; Kamath, Vinod; Kochuparambil, Bejoy J; Schmidt, Roger R; Schultz, Mark D; Simco, Daniel P; Steinke, Mark E

    2014-02-11

    A method of fabricating a liquid-cooled electronic system is provided which includes an electronic assembly having an electronics card and a socket with a latch at one end. The latch facilitates securing of the card within the socket. The method includes providing a liquid-cooled cold rail at the one end of the socket, and a thermal spreader to couple the electronics card to the cold rail. The thermal spreader includes first and second thermal transfer plates coupled to first and second surfaces on opposite sides of the card, and thermally conductive extensions extending from end edges of the plates, which couple the respective transfer plates to the liquid-cooled cold rail. The extensions are disposed to the sides of the latch, and the card is securable within or removable from the socket using the latch without removing the cold rail or the thermal spreader.

  7. Hybrid Geometric Reduction of Hybrid Systems Aaron D. Ames and Shankar Sastry

    E-Print Network [OSTI]

    Sastry, S. Shankar

    Hybrid Geometric Reduction of Hybrid Systems Aaron D. Ames and Shankar Sastry Abstract-- This paper presents a unifying framework in which to carry out the hybrid geometric reduction of hybrid systems, generalizing classical reduction to a hybrid setting. I. INTRODUCTION The reduction of mechanical systems

  8. Redesigning Process Cooling Systems in the Plastics Industry 

    E-Print Network [OSTI]

    Anderson, G. R.

    2006-01-01

    systems were designed with one thing in mind – ensuring adequate capacity. Energy consumption was a much lower priority with their process cooling systems, resulting in inefficient chillers, oversized pumps, undersized cooling towers, and poorly... sequenced operations. Lifetime decided to step back and evaluate their entire cooling system for opportunities to reduce energy use after they recognized the potential for “free cooling” from the chiller’s cooling towers during the winter. Lifetime’s...

  9. Method for passive cooling liquid metal cooled nuclear reactors, and system thereof

    DOE Patents [OSTI]

    Hunsbedt, Anstein (Los Gatos, CA); Busboom, Herbert J. (San Jose, CA)

    1991-01-01

    A liquid metal cooled nuclear reactor having a passive cooling system for removing residual heat resulting from fuel decay during reactor shutdown. The passive cooling system comprises a plurality of partitions surrounding the reactor vessel in spaced apart relation forming intermediate areas for circulating heat transferring fluid which remove and carry away heat from the reactor vessel.

  10. Hybrid optical-thermal devices and materials for light manipulation and radiative cooling

    E-Print Network [OSTI]

    Boriskina, Svetlana V; Hsu, Wei-Chun; Weinstein, Lee; Huang, Xiaopeng; Loomis, James; Xu, Yanfei; Chen, Gang

    2015-01-01

    We report on optical design and applications of hybrid meso-scale devices and materials that combine optical and thermal management functionalities owing to their tailored resonant interaction with light in visible and infrared frequency bands. We outline a general approach to designing such materials, and discuss two specific applications in detail. One example is a hybrid optical-thermal antenna with sub-wavelength light focusing, which simultaneously enables intensity enhancement at the operating wavelength in the visible and reduction of the operating temperature. The enhancement is achieved via light recycling in the form of whispering-gallery modes trapped in an optical microcavity, while cooling functionality is realized via a combination of reduced optical absorption and radiative cooling. The other example is a fabric that is opaque in the visible range yet highly transparent in the infrared, which allows the human body to efficiently shed energy in the form of thermal emission. Such fabrics can find...

  11. System for controlling a hybrid energy system

    DOE Patents [OSTI]

    Hoff, Brian D.; Akasam, Sivaprasad

    2013-01-29

    A method includes identifying a first operating sequence of a repeated operation of at least one non-traction load. The method also includes determining first and second parameters respectively indicative of a requested energy and output energy of the at least one non-traction load and comparing the determined first and second parameters at a plurality of time increments of the first operating sequence. The method also includes determining a third parameter of the hybrid energy system indicative of energy regenerated from the at least one non-traction load and monitoring the third parameter at the plurality of time increments of the first operating sequence. The method also includes determining at least one of an energy deficiency or an energy surplus associated with the non-traction load of the hybrid energy system and selectively adjusting energy stored within the storage device during at least a portion of a second operating sequence.

  12. Sensitivity analysis of oscillating hybrid systems

    E-Print Network [OSTI]

    Saxena, Vibhu Prakash

    2010-01-01

    Many models of physical systems oscillate periodically and exhibit both discrete-state and continuous-state dynamics. These systems are called oscillating hybrid systems and find applications in diverse areas of science ...

  13. Simulation of cooling systems in gas turbines

    SciTech Connect (OSTI)

    Ebenhoch, G.; Speer, T.M. [Motoren- und Turbinen-Union Muenchen GmbH (Germany)

    1996-04-01

    The design of cooling systems for gas turbine engine blades and vanes calls for efficient simulation programs. The main purpose of the described program is to determine the complete boundary condition at the coolant side to support a temperature calculation for the solid. For the simulation of convection and heat pick up of the coolant flow, pressure loss, and further effects to be found in a rotating frame, the cooling systems are represented by networks of nodes and flow elements. Within each flow element the fluid flow is modeled by a system of ordinary differential equations based on the one-dimensional conservation of mass, momentum, and energy. In this respect, the computer program differs from many other network computation programs. Concerning cooling configurations in rotating systems, the solution for a single flow element or the entire flow system is not guaranteed to be unique. This is due to rotational forces in combination with heat transfer and causes considerable computational difficulties, which can be overcome by a special path following method in which the angular velocity is selected as the parameter of homotopy. Results of the program are compared with measurements for three applications.

  14. Controlled cooling of an electronic system based on projected conditions

    DOE Patents [OSTI]

    David, Milnes P.; Iyengar, Madhusudan K.; Schmidt, Roger R.

    2015-08-18

    Energy efficient control of a cooling system cooling an electronic system is provided based, in part, on projected conditions. The control includes automatically determining an adjusted control setting(s) for an adjustable cooling component(s) of the cooling system. The automatically determining is based, at least in part, on projected power consumed by the electronic system at a future time and projected temperature at the future time of a heat sink to which heat extracted is rejected. The automatically determining operates to reduce power consumption of the cooling system and/or the electronic system while ensuring that at least one targeted temperature associated with the cooling system or the electronic system is within a desired range. The automatically determining may be based, at least in part, on an experimentally obtained model(s) relating the targeted temperature and power consumption of the adjustable cooling component(s) of the cooling system.

  15. New baseline for the magnet cooling system Yury Ivanyushenkov

    E-Print Network [OSTI]

    McDonald, Kirk

    1 New baseline for the magnet cooling system Yury Ivanyushenkov Engineering and Instrumentation Department, Rutherford Appleton Laboratory #12;2 Liquid nitrogen cooling system: Conceptual points · Magnet the magnet as a stand alone system. #12;3 Liquid nitrogen cooling system: Diagram Drawn by Peter Titus #12

  16. Hybrid Cotangent Bundle Reduction of Simple Hybrid Mechanical Systems with Symmetry

    E-Print Network [OSTI]

    Ames, Aaron

    Hybrid Cotangent Bundle Reduction of Simple Hybrid Mechanical Systems with Symmetry Aaron D. Ames the notion of a simple hybrid mechanical system, which generalizes mechanical systems to include unilateral constraints on the configuration space. From such a system we obtain, explicitly, a simple hybrid system

  17. Low pressure cooling seal system for a gas turbine engine

    DOE Patents [OSTI]

    Marra, John J

    2014-04-01

    A low pressure cooling system for a turbine engine for directing cooling fluids at low pressure, such as at ambient pressure, through at least one cooling fluid supply channel and into a cooling fluid mixing chamber positioned immediately downstream from a row of turbine blades extending radially outward from a rotor assembly to prevent ingestion of hot gases into internal aspects of the rotor assembly. The low pressure cooling system may also include at least one bleed channel that may extend through the rotor assembly and exhaust cooling fluids into the cooling fluid mixing chamber to seal a gap between rotational turbine blades and a downstream, stationary turbine component. Use of ambient pressure cooling fluids by the low pressure cooling system results in tremendous efficiencies by eliminating the need for pressurized cooling fluids for sealing this gap.

  18. Geothermal Heating and Cooling Systems Featured on NBC Nightly...

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

    Heating and Cooling Systems Featured on NBC Nightly News Geothermal Heating and Cooling Systems Featured on NBC Nightly News April 13, 2009 - 11:24am Addthis NBC Nightly News...

  19. Cooling System Basics | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: Alternative Fuels DataEnergy Webinar:IAbout Us » Contact PPPOContributingCooling System

  20. Cooling of neutron stars and hybrid stars with a stiff hadronic EoS

    E-Print Network [OSTI]

    H. Grigorian; D. Blaschke; D. N. Voskresensky

    2015-03-16

    Within the "nuclear medium cooling" scenario of neutron stars all reliably known temperature - age data, including those of the central compact objects in the supernova remnants of Cassiopeia A and XMMU-J1732, can be comfortably explained by a set of cooling curves obtained by variation of the star mass within the range of typical observed masses. The recent measurements of the high masses of the pulsars PSR J1614-2230 and PSR J0348-0432 on the one hand, and of the low masses for PSR J0737-3039B and the companion of PSR J1756-2251 on the other, provide independent proof for the existence of neutron stars with masses in a broad range from $\\sim 1.2$ to 2 $M_\\odot$. The values $M>2 M_{\\odot}$ call for sufficiently stiff equations of state for neutron star matter. We investigate the response of the set of neutron star cooling curves to a stiffening of the nuclear equation of state so that maximum masses of about $2.4 M_\\odot$ would be accessible and to a deconfinement phase transition from such stiff nuclear matter in the outer core to color superconducting quark matter in the inner core. Without readjustment of cooling inputs the mass range required to cover all cooling data for the stiff DD2 equation of state should include masses of $2.426 M_\\odot$ for describing the fast cooling of CasA while the existence of a quark matter core accelerates the cooling so that CasA cooling data are described with a hybrid star of mass $1.674 M_\\odot$.

  1. Home Cooling Systems | Department of Energy

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

    Fans In many climates, you can use a whole-house fan to meet all or most of your home cooling needs. Evaporative Cooling For homes in dry climates, evaporative cooling or...

  2. Maintenance Guide for Greenhouse Ventilation, Evaporative Cooling Heating Systems1

    E-Print Network [OSTI]

    Hill, Jeffrey E.

    AE26 Maintenance Guide for Greenhouse Ventilation, Evaporative Cooling Heating Systems1 D. E and preventive maintenance procedures for ventilation, evaporative cooling and heating systems. Ventilation a ventilation system is not operating properly, the results can be pockets of stagnant air, inadequate cooling

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

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

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

  4. 2012 Annual Merit Review Results Report - Hybrid Vehicle Systems...

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

    Hybrid Vehicle Systems Technologies 2012 Annual Merit Review Results Report - Hybrid Vehicle Systems Technologies Merit review of DOE Vehicle Technologies research activities...

  5. 2013 Annual Merit Review Results Report - Hybrid Vehicle Systems...

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

    Hybrid Vehicle Systems Technologies 2013 Annual Merit Review Results Report - Hybrid Vehicle Systems Technologies Merit review of DOE Vehicle Technologies research activities...

  6. 2014 Annual Merit Review Results Report - Hybrid Vehicle Systems...

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

    Hybrid Vehicle Systems Technologies 2014 Annual Merit Review Results Report - Hybrid Vehicle Systems Technologies Merit review of DOE Vehicle Technologies research activities...

  7. Advanced Methods Approach to Hybrid Powertrain Systems Optimization...

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

    Methods Approach to Hybrid Powertrain Systems Optimization of a Transit Bus Application Advanced Methods Approach to Hybrid Powertrain Systems Optimization of a Transit Bus...

  8. Home Cooling Systems | Department of Energy

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

    Home cooling accounts for 6 percent of the average household's energy use. To help you save money by saving energy, our experts are answering your home cooling questions. |...

  9. Impact of Solar Heat Gain on Radiant Floor Cooling System Design

    E-Print Network [OSTI]

    Feng, Jingjuan Dove; Schiavon, Stefano; Bauman, Fred

    2013-01-01

    Radiant Heating and Cooling Systems, in, 2012. [15] F.Gain on Radiant Floor Cooling System Design. Proceedings ofof radiant floor cooling systems and their associated air

  10. Performance Evaluation for Modular, Scalable Liquid-Rack Cooling Systems in Data Centers

    E-Print Network [OSTI]

    Xu, TengFang

    2009-01-01

    while modular system cooling kW/ton value exhibited aback into the modular cooling system and passed through thethe ventilation and cooling systems being less than optimal.

  11. Simulations of sizing and comfort improvements for residential forced-air heating and cooling systems

    E-Print Network [OSTI]

    Walker, I.S.; Degenetais, G.; Siegel, J.A.

    2002-01-01

    the effect of heating and cooling system inefficiencies onwith inefficient heating and cooling systems in CaliforniaForced-Air Heating and Cooling Systems May 2002 Walker, I. ,

  12. A computer simulation appraisal of non-residential low energy cooling systems in California

    E-Print Network [OSTI]

    Bourassa, Norman; Haves, Philip; Huang, Joe

    2002-01-01

    of Nonresidential Low Energy Cooling Systems in California-of Nonresidential Low Energy Cooling Systems in Californiaof Nonresidential Low Energy Cooling Systems in California

  13. Performance Evaluation for Modular, Scalable Cooling Systems with Hot Aisle Containment in Data Centers

    E-Print Network [OSTI]

    Adams, Barbara J

    2009-01-01

    on the characteristics of cooling systems and servers Theraised, CRAH cooling system and the modular, scalableINFORMATION ON THE CHARACTERISTICS OF COOLING SYSTEMS AND

  14. Performance Evaluation for a Modular, Scalable Passive Cooling System in Data Centers

    E-Print Network [OSTI]

    Xu, TengFang

    2009-01-01

    by the passive modular cooling system; and P hydraulic isthe ventilation and cooling systems being less than optimal.modular and scalable cooling systems aim at significantly

  15. Cooling load calculations for radiant systems: are they the same traditional methods?

    E-Print Network [OSTI]

    Bauman, Fred; Feng, Jingjuan Dove; Schiavon, Stefano

    2013-01-01

    of Radiant vs. Air System Cooling Loads Recent simulationsystem, the radiant system cooling Advertisement formerly inthe mea- sured radiant system cooling load. The RTS method

  16. Hybrid systems process mixed wastes

    SciTech Connect (OSTI)

    Chertow, M.R.

    1989-10-01

    Some technologies, developed recently in Europe, combine several processes to separate and reuse materials from solid waste. These plants have in common, generally, that they are reasonably small, have a composting component for the organic portion, and often have a refuse-derived fuel component for combustible waste. Many European communities also have very effective drop-off center programs for recyclables such as bottles and cans. By maintaining the integrity of several different fractions of the waste, there is a less to landfill and less to burn. The importance of these hybrid systems is that they introduce in one plant an approach that encompasses the key concept of today's solid waste planning; recover as much as possible and landfill as little as possible. The plants also introduce various risks, particularly of finding secure markets. There are a number of companies offering various combinations of materials recovery, composting, and waste combustion. Four examples are included: multiple materials recovery and refuse-derived fuel production in Eden Prairie, Minnesota; multiple materials recovery, composting and refuse-derived fuel production in Perugia, Italy; composting, refuse-derived fuel, and gasification in Tolmezzo, Italy; and a front-end system on a mass burning waste-to-energy plant in Neuchatel, Switzerland.

  17. DRAFT INTERIM REPORT: NATIONAL PROGRAM PLAN FOR PASSIVE AND HYBRID SOLAR HEATING AND COOLING

    E-Print Network [OSTI]

    Authors, Various

    2012-01-01

    Plan for Passive Solar Heating and Cooling builds upon theto design, build, finance, and market passive solar systems.a build- ing•s thermal energy requirements, • Passive solar

  18. Cooling System for the MERIT High-Power Target Experiment

    E-Print Network [OSTI]

    McDonald, Kirk

    Cooling System for the MERIT High-Power Target Experiment Haug F., Pereira H., Silva P., Pezzetti M cryogenic cooling system of novel design permits the transfer of nitrogen by the sole means of differential a free mercury jet inside a normal conducting pulsed 15 T capture solenoid magnet cooled with liquid

  19. The Thermodynamic and Cost Benefits of Floating Cooling Systems 

    E-Print Network [OSTI]

    Svoboda, K. J.; Klooster, H. J.; Johnnie, D. H., Jr.

    1983-01-01

    Historically, a fixed cooling concept is used in the design of evaporative heat rejection systems for process and power plants. In the fixed cooling mode, a plant is designed for maximum output at the design summer wet bulb temperature...

  20. Potential of Evaporative Cooling Systems for Buildings in India 

    E-Print Network [OSTI]

    Maiya, M. P.; Vijay, S.

    2010-01-01

    psychrometric chart for different cities in India like Ahmadabad, Jodhpur, Nagpur and New Delhi representing different climatic conditions of India. While satisfactorily comfort can be achieved at cool and dry weather conditions by evaporative cooling system...

  1. A Free Cooling Based Chilled Water System at Kingston 

    E-Print Network [OSTI]

    Jansen, P. R.

    1984-01-01

    In efforts to reduce operating costs, the IBM site at Kingston, New York incorporated the energy saving concept of 'free cooling' (direct cooling of chilled water with condenser water) with the expansion of the site chilled water system. Free...

  2. CCHP System with Interconnecting Cooling and Heating Network 

    E-Print Network [OSTI]

    Fu, L.; Geng, K.; Zheng, Z.; Jiang, Y.

    2006-01-01

    The consistency between building heating load, cooling load and power load are analyzed in this paper. The problem of energy waste and low equipment usage in a traditional CCHP (combined cooling, heating and power) system with generated electricity...

  3. Improving the Water Efficiency of Cooling Production System 

    E-Print Network [OSTI]

    Maheshwari, G.; Al-Hadban, Y.; Al-Taqi, H. H.; Alasseri, R.

    2010-01-01

    For most of the time, cooling towers (CTs) of cooling systems operate under partial load conditions and by regulating the air circulation with a variable frequency drive (VFD), significant reduction in the fan power can be achieved. In Kuwait...

  4. NASA's Marshall Space Flight Center Improves Cooling System Performance

    Broader source: Energy.gov [DOE]

    Case study details Marshall Space Flight Center's innovative technologies to improve water efficiency and cooling performance for one of its problematic cooling systems. The program saved the facility more than 800,000 gallons of water in eight months.

  5. Integrated exhaust gas recirculation and charge cooling system

    DOE Patents [OSTI]

    Wu, Ko-Jen

    2013-12-10

    An intake system for an internal combustion engine comprises an exhaust driven turbocharger configured to deliver compressed intake charge, comprising exhaust gas from the exhaust system and ambient air, through an intake charge conduit and to cylinders of the internal combustion engine. An intake charge cooler is in fluid communication with the intake charge conduit. A cooling system, independent of the cooling system for the internal combustion engine, is in fluid communication with the intake charge cooler through a cooling system conduit. A coolant pump delivers a low temperature cooling medium from the cooling system to and through the intake charge cooler for the transfer of heat from the compressed intake charge thereto. A low temperature cooler receives the heated cooling medium through the cooling system conduit for the transfer or heat therefrom.

  6. Polk power station syngas cooling system

    SciTech Connect (OSTI)

    Jenkins, S.D.

    1995-01-01

    Tampa Electric Company (TEC) is in the site development and construction phase of the new Polk Power Station Unit No. 1. This will be the first unit at a new site and will use Integrated Gasification Combined Cycle (IGCC) Technology. The unit will utilize Texaco`s oxygen-blown, entrained-flow coal gasification, along with combined cycle power generation, to produce nominal 260MW. Integral to the gasification process is the syngas cooling system. The design, integration, fabrication, transportation, and erection of this equipment have provided and continue to provide major challenges for this project.

  7. Cedarville School District Retrofit of Heating and Cooling Systems...

    Open Energy Info (EERE)

    - Remove unusable antiquated existing equipment and systems from the campus heating and cooling system, but utilize ductwork, piping, etc. where feasible. The campus is served by...

  8. Economizer refrigeration cycle space heating and cooling system and process

    DOE Patents [OSTI]

    Jardine, Douglas M. (Colorado Springs, CO)

    1983-01-01

    This invention relates to heating and cooling systems and more particularly to an improved system utilizing a Stirling Cycle engine heat pump in a refrigeration cycle.

  9. Economizer refrigeration cycle space heating and cooling system and process

    DOE Patents [OSTI]

    Jardine, D.M.

    1983-03-22

    This invention relates to heating and cooling systems and more particularly to an improved system utilizing a Stirling Cycle engine heat pump in a refrigeration cycle. 18 figs.

  10. Formal Verification of Hybrid Systems Rajeev Alur

    E-Print Network [OSTI]

    Alur, Rajeev

    , of the system un- der design, and performs extensive analysis with respect to correctness requirements-1-4503-0714-7/11/10 ...$5.00. mathematical model for design of embedded control systems is hybrid systems that combines for dynamical systems. Such models can capture both the controller -- the system under design, and the plant

  11. Reuse of hybrid car power systems

    E-Print Network [OSTI]

    Kirkby, Nicholas (Nicholas J.)

    2015-01-01

    Used hybrid car power systems are inexpensive and capable of tens of kilowatts of power throughput. This paper documents a process for using the second generation Toyota Prius inverter module to drive a three phase permanent ...

  12. Powertrain system for a hybrid electric vehicle

    DOE Patents [OSTI]

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

    1999-08-31

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

  13. Powertrain system for a hybrid electric vehicle

    DOE Patents [OSTI]

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

    1999-08-31

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

  14. Analysis of Hybrid Hydrogen Systems: Final Report

    SciTech Connect (OSTI)

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

    2010-01-01

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

  15. Hybrid Routhian Reduction of Lagrangian Hybrid Systems Aaron D. Ames and Shankar Sastry

    E-Print Network [OSTI]

    Ames, Aaron

    Hybrid Routhian Reduction of Lagrangian Hybrid Systems Aaron D. Ames and Shankar Sastry Department,sastry}@eecs.berkeley.edu Abstract-- This paper extends Routhian reduction to a hybrid setting, i.e., to systems that display both with unilateral constraints on the set of admissible configurations. This naturally yields the notion of a hybrid

  16. Hybrid Systems with Finite Bisimulations Gerardo Lafferriere1

    E-Print Network [OSTI]

    Pappas, George J.

    Hybrid Systems with Finite Bisimulations Gerardo Lafferriere1 , George J. Pappas2 , and Shankar is one of the main approach- es to hybrid system analysis. Decidability questions for verification algo classes of planar hybrid systems. 1 Introduction Hybrid systems consist of finite state machines

  17. Modeling and Optimization of Hybrid Solar Thermoelectric Systems...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: Modeling and Optimization of Hybrid Solar Thermoelectric Systems with Thermosyphons Citation Details In-Document Search Title: Modeling and Optimization of Hybrid...

  18. Manzanita Hybrid Power system Project Final Report

    SciTech Connect (OSTI)

    Trisha Frank

    2005-03-31

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

  19. Phasing of Debuncher Stochastic Cooling Transverse Systems

    SciTech Connect (OSTI)

    Pasquinelli, Ralph; /Fermilab

    2000-03-09

    With the higher frequency of the cooling systems in the Debuncher, a modified method of making transfer functions has been developed for transverse systems. (Measuring of the momentum systems is unchanged.) Speed in making the measurements is critical, as the beam tends to decelerate due to vacuum lifetime. In the 4-8 GHz band, the harmonics in the Debuncher are 6,700 to 13,400 times the revolution frequency. Every Hertz change in revolution frequency is multiplied by this harmonic number and becomes a frequency measurement error, which is an appreciable percent of the momentum width of the beam. It was originally thought that a momentum cooling system would be phased first so that the beam could be kept from drifting in revolution frequency. As it turned out, the momentum cooling was so effective (even with the gain turned down) that the momentum width normalized to fo became less than one Hertz on the Schottky pickup. A beam this narrow requires very precise measurement of tune and revolution frequency. It was difficult to get repeatable results. For initial measuring of the transverse arrays, relative phase and delay is all that is required, so the measurement settings outlined below will suffice. Once all input and output arrays are phased, a more precise measurement of all pickups to all kickers can be done with more points and both upper and lower side bands, as in figure 1. Settings on the network analyzer were adjusted for maximum measurement speed. Data is not analyzed until a complete set of measurements is taken. Start and stop frequencies should be chosen to be just slightly wider than the band being measured. For transverse systems, select betatron USB for the measurement type. This will make the measurement two times faster. Select 101 for the number of points, sweep time of 5 seconds, IF bandwidth 30 Hz, averages = 1. It is important during the phasing to continually measure the revolution frequency and beam width of the beam for transverse systems. Beam width is defined as the 3 dB bandwidth of the momentum Schottky divided by 127 (the harmonic of the Schottky pickup in the Debuncher.) Every three to five minutes, the beam drifts enough to make a significant change in the data. Knowing the revolution frequency and beam width to 0.5 Hz is important. If the beam width exceeds 10 Hz, the quality of the measurement will be impaired. Large beam widths can be caused by excessive forward proton beam current. There are also signs that the front-end amplifiers saturate with beam currents above several hundred microamps. The cooling systems were designed to be very sensitive, (that's why the front end is at liquid helium temperature) so a hundred microamps will go a long way. It should be possible to phase the systems with Pbars as a signal to noise ratio of 30 dB was observed with 100 microamps of beam current.

  20. Passive cooling system for nuclear reactor containment structure

    DOE Patents [OSTI]

    Gou, Perng-Fei (Saratoga, CA); Wade, Gentry E. (Saratoga, CA)

    1989-01-01

    A passive cooling system for the contaminant structure of a nuclear reactor plant providing protection against overpressure within the containment attributable to inadvertent leakage or rupture of the system components. The cooling system utilizes natural convection for transferring heat imbalances and enables the discharge of irradiation free thermal energy to the atmosphere for heat disposal from the system.

  1. Natural circulating passive cooling system for nuclear reactor containment structure

    DOE Patents [OSTI]

    Gou, Perng-Fei (Saratoga, CA); Wade, Gentry E. (Saratoga, CA)

    1990-01-01

    A passive cooling system for the contaminant structure of a nuclear reactor plant providing protection against overpressure within the containment attributable to inadvertent leakage or rupture of the system components. The cooling system utilizes natural convection for transferring heat imbalances and enables the discharge of irradiation free thermal energy to the atmosphere for heat disposal from the system.

  2. Critical review of water based radiant cooling system design methods

    E-Print Network [OSTI]

    Feng, Jingjuan Dove; Bauman, Fred; Schiavon, Stefano

    2014-01-01

    buildings CRITICAL REVIEW OF WATER BASED RADIANT COOLINGare two primary types of water-based radiant systems: (1)cooling/heating output, water supply temperatures Notes NA

  3. Cedarville School District Retrofit of Heating and Cooling Systems...

    Energy Savers [EERE]

    Cedarville School District Retrofit of Heating and Cooling Systems with Geothermal Heat Pumpsand Ground Source Water Loops Cedarville School District Retrofit of Heating and...

  4. Solar air-conditioning-active, hybrid and passive

    SciTech Connect (OSTI)

    Yellott, J. I.

    1981-04-01

    After a discussion of summer air conditioning requirements in the United States, active, hybrid, and passive cooling systems are defined. Active processes and systems include absorption, Rankine cycle, and a small variety of miscellaneous systems. The hybrid solar cooling and dehumidification technology of desiccation is covered as well as evaporative cooling. The passive solar cooling processes covered include convective, radiative and evaporative cooling. Federal and state involvement in solar cooling is then discussed. (LEW)

  5. Designing a 'Near Optimum' Cooling-Water System 

    E-Print Network [OSTI]

    Crozier, R. A., Jr.

    1981-01-01

    developed similar procedures for designing and optimizing a cooling-water once through-exchanger system. This article attempts to fill the void by presenting a design basis that will produce a 'near optimum' system. A cooling-water system consists of four...

  6. Temperature and cooling management in computing systems

    E-Print Network [OSTI]

    Ayoub, Raid

    2011-01-01

    78 5.2 Combined Energy, Thermal and Coolingdo not account for energy and thermal optimizations for theWe propose a combined energy, thermal and cooling management

  7. Cooling load calculations for radiant systems: are they the same traditional methods?

    E-Print Network [OSTI]

    Bauman, Fred; Feng, Jingjuan Dove; Schiavon, Stefano

    2013-01-01

    B. 2008. “Radiant floor cooling systems. ” ASHRAE Journal 4.embedded radiant heating and cooling. Geneva: InternationalM. Deru. 2010. “Radiant slab cooling for retail. ” ASHRAE

  8. Cooling Water Systems - Energy Savings/Lower Costs By Reusing Cooling Tower Blowdown 

    E-Print Network [OSTI]

    Puckorius, P. R.

    1981-01-01

    down for reuse into the cooling tower system. Several plants have been built and operated with considerable difficulty regarding effective operation of the softener due to improper chemical selection. However, other plants have utilized the proper...

  9. Optimized Design of a Furnace Cooling System 

    E-Print Network [OSTI]

    Morelli, F.; Bretschneider, R.; Dauzat, J.; Guymon, M.; Studebaker, J.; Rasmussen, B. P.

    2013-01-01

    This paper presents a case study of manufacturing furnace optimized re-design. The bottleneck in the production process is the cooling of heat treatment furnaces. These ovens are on an approximate 24-hour cycle, heating for 12 hours and cooling...

  10. DRAFT INTERIM REPORT: NATIONAL PROGRAM PLAN FOR PASSIVE AND HYBRID SOLAR HEATING AND COOLING

    E-Print Network [OSTI]

    Authors, Various

    2012-01-01

    Definitions Space Heating Space Cooling Hot Water . .in Passive Solar Heating and Cooling Section C: Program GoalSpace Heating Space Cooling Section G: Task Classifications

  11. Debris trap in a turbine cooling system

    DOE Patents [OSTI]

    Wilson, Ian David (Clifton Park, NY)

    2002-01-01

    In a turbine having a rotor and a plurality of stages, each stage comprising a row of buckets mounted on the rotor for rotation therewith; and wherein the buckets of at least one of the stages are cooled by steam, the improvement comprising at least one axially extending cooling steam supply conduit communicating with an at least partially annular steam supply manifold; one or more axially extending cooling steam feed tubes connected to the manifold at a location radially outwardly of the cooling steam supply conduit, the feed tubes arranged to supply cooling steam to the buckets of at least one of the plurality of stages; the manifold extending radially beyond the feed tubes to thereby create a debris trap region for collecting debris under centrifugal loading caused by rotation of the rotor.

  12. Nuclear reactor cooling system decontamination reagent regeneration

    DOE Patents [OSTI]

    Anstine, Larry D. (San Jose, CA); James, Dean B. (Saratoga, CA); Melaika, Edward A. (Berkeley, CA); Peterson, Jr., John P. (Livermore, CA)

    1985-01-01

    An improved method for decontaminating the coolant system of water-cooled nuclear power reactors and for regenerating the decontamination solution. A small amount of one or more weak-acid organic complexing agents is added to the reactor coolant, and the pH is adjusted to form a decontamination solution which is circulated throughout the coolant system to dissolve metal oxides from the interior surfaces and complex the resulting metal ions and radionuclide ions. The coolant containing the complexed metal ions and radionuclide ions is passed through a strong-base anion exchange resin bed which has been presaturated with a solution containing the complexing agents in the same ratio and having the same pH as the decontamination solution. As the decontamination solution passes through the resin bed, metal-complexed anions are exchanged for the metal-ion-free anions on the bed, while metal-ion-free anions in the solution pass through the bed, thus removing the metal ions and regenerating the decontamination solution.

  13. Approximate bisimulation for a class of stochastic hybrid systems

    E-Print Network [OSTI]

    Pappas, George J.

    , target tracking, robotics, and power systems [35]. The field of stochastic hybrid systems is a veryApproximate bisimulation for a class of stochastic hybrid systems (Invited Paper) Agung Julius of stochastic hybrid systems, namely, the jump linear stochastic systems (JLSS). The idea is based

  14. Control system for a hybrid powertrain system

    DOE Patents [OSTI]

    Naqvi, Ali K.; Demirovic, Besim; Gupta, Pinaki; Kaminsky, Lawrence A.

    2014-09-09

    A vehicle includes a powertrain with an engine, first and second torque machines, and a hybrid transmission. A method for operating the vehicle includes operating the engine in an unfueled state, releasing an off-going clutch which when engaged effects operation of the hybrid transmission in a first continuously variable mode, and applying a friction braking torque to a wheel of the vehicle to compensate for an increase in an output torque of the hybrid transmission resulting from releasing the off-going clutch. Subsequent to releasing the off-going clutch, an oncoming clutch which when engaged effects operation of the hybrid transmission in a second continuously variable mode is synchronized. Subsequent to synchronization of the oncoming clutch, the oncoming clutch is engaged.

  15. Absolute Dynamical Limit to Cooling Weakly-Coupled Quantum Systems

    E-Print Network [OSTI]

    X. Wang; Sai Vinjanampathy; Frederick W. Strauch; Kurt Jacobs

    2012-05-15

    Cooling of a quantum system is limited by the size of the control forces that are available (the "speed" of control). We consider the most general cooling process, albeit restricted to the regime in which the thermodynamics of the system is preserved (weak coupling). Within this regime, we further focus on the most useful control regime, in which a large cooling factor, and good ground-state cooling can be achieved. We present a control protocol for cooling, and give clear structural arguments, as well as strong numerical evidence, that this protocol is globally optimal. From this we obtain simple expressions for the limit to cooling that is imposed by the speed of control.

  16. Ventilation Systems for Cooling | Department of Energy

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

    ventilation can help keep your home cool during hot days. To avoid heat buildup in your home, plan ahead by landscaping your lot to shade your house. If you replace your roof,...

  17. Heat pump system with selective space cooling

    DOE Patents [OSTI]

    Pendergrass, Joseph C. (Gainesville, GA)

    1997-01-01

    A reversible heat pump provides multiple heating and cooling modes and includes a compressor, an evaporator and heat exchanger all interconnected and charged with refrigerant fluid. The heat exchanger includes tanks connected in series to the water supply and a condenser feed line with heat transfer sections connected in counterflow relationship. The heat pump has an accumulator and suction line for the refrigerant fluid upstream of the compressor. Sub-cool transfer tubes associated with the accumulator/suction line reclaim a portion of the heat from the heat exchanger. A reversing valve switches between heating/cooling modes. A first bypass is operative to direct the refrigerant fluid around the sub-cool transfer tubes in the space cooling only mode and during which an expansion valve is utilized upstream of the evaporator/indoor coil. A second bypass is provided around the expansion valve. A programmable microprocessor activates the first bypass in the cooling only mode and deactivates the second bypass, and vice-versa in the multiple heating modes for said heat exchanger. In the heating modes, the evaporator may include an auxiliary outdoor coil for direct supplemental heat dissipation into ambient air. In the multiple heating modes, the condensed refrigerant fluid is regulated by a flow control valve.

  18. Heat pump system with selective space cooling

    DOE Patents [OSTI]

    Pendergrass, J.C.

    1997-05-13

    A reversible heat pump provides multiple heating and cooling modes and includes a compressor, an evaporator and heat exchanger all interconnected and charged with refrigerant fluid. The heat exchanger includes tanks connected in series to the water supply and a condenser feed line with heat transfer sections connected in counterflow relationship. The heat pump has an accumulator and suction line for the refrigerant fluid upstream of the compressor. Sub-cool transfer tubes associated with the accumulator/suction line reclaim a portion of the heat from the heat exchanger. A reversing valve switches between heating/cooling modes. A first bypass is operative to direct the refrigerant fluid around the sub-cool transfer tubes in the space cooling only mode and during which an expansion valve is utilized upstream of the evaporator/indoor coil. A second bypass is provided around the expansion valve. A programmable microprocessor activates the first bypass in the cooling only mode and deactivates the second bypass, and vice-versa in the multiple heating modes for said heat exchanger. In the heating modes, the evaporator may include an auxiliary outdoor coil for direct supplemental heat dissipation into ambient air. In the multiple heating modes, the condensed refrigerant fluid is regulated by a flow control valve. 4 figs.

  19. Hybrid Molten Salt Reactor (HMSR) System Study

    SciTech Connect (OSTI)

    Woolley, Robert D; Miller, Laurence F

    2014-04-01

    Can the hybrid system combination of (1) a critical fission Molten Salt Reactor (MSR) having a thermal spectrum and a high Conversion Ratio (CR) with (2) an external source of high energy neutrons provide an attractive solution to the world's expanding demand for energy? The present study indicates the answer is an emphatic yes.

  20. Understanding and reducing energy and costs in industrial cooling systems 

    E-Print Network [OSTI]

    Muller, M.R.; Muller, M.B.

    2012-01-01

    demonstrates the large amount of increased saving from a critical review of plant chilled water systems with both hardware and operational improvements. After showing several reasons why cooling systems are often ignored during plant energy surveys (their...

  1. Cooling system early-stage design tool for naval applications

    E-Print Network [OSTI]

    Fiedel, Ethan R

    2011-01-01

    This thesis utilizes concepts taken from the NAVSEA Design Practices and Criteria Manualfor Surface Ship Freshwater Systems and other references to create a Cooling System Design Tool (CSDT). With the development of new ...

  2. Hybrid Energy System Modeling in Modelica

    SciTech Connect (OSTI)

    William R. Binder; Christiaan J. J. Paredis; Humberto E. Garcia

    2014-03-01

    In this paper, a Hybrid Energy System (HES) configuration is modeled in Modelica. Hybrid Energy Systems (HES) have as their defining characteristic the use of one or more energy inputs, combined with the potential for multiple energy outputs. Compared to traditional energy systems, HES provide additional operational flexibility so that high variability in both energy production and consumption levels can be absorbed more effectively. This is particularly important when including renewable energy sources, whose output levels are inherently variable, determined by nature. The specific HES configuration modeled in this paper include two energy inputs: a nuclear plant, and a series of wind turbines. In addition, the system produces two energy outputs: electricity and synthetic fuel. The models are verified through simulations of the individual components, and the system as a whole. The simulations are performed for a range of component sizes, operating conditions, and control schemes.

  3. Verifying Hybrid Systems Modeled as Timed Automata: A Case Study?

    E-Print Network [OSTI]

    -Vaandrager timed automata model, of the Steam Boiler Controller problem, a hybrid systems benchmark. This pa- per

  4. Closed loop air cooling system for combustion turbines

    DOE Patents [OSTI]

    Huber, David John (North Canton, OH); Briesch, Michael Scot (Orlando, FL)

    1998-01-01

    Convective cooling of turbine hot parts using a closed loop system is disclosed. Preferably, the present invention is applied to cooling the hot parts of combustion turbine power plants, and the cooling provided permits an increase in the inlet temperature and the concomitant benefits of increased efficiency and output. In preferred embodiments, methods and apparatus are disclosed wherein air is removed from the combustion turbine compressor and delivered to passages internal to one or more of a combustor and turbine hot parts. The air cools the combustor and turbine hot parts via convection and heat is transferred through the surfaces of the combustor and turbine hot parts.

  5. Compact Solid State Cooling Systems: Compact MEMS Electrocaloric Module

    SciTech Connect (OSTI)

    None

    2010-10-01

    BEETIT Project: UCLA is developing a novel solid-state cooling technology to translate a recent scientific discovery of the so-called giant electrocaloric effect into commercially viable compact cooling systems. Traditional air conditioners use noisy, vapor compression systems that include a polluting liquid refrigerant to circulate within the air conditioner, absorb heat, and pump the heat out into the environment. Electrocaloric materials achieve the same result by heating up when placed within an electric field and cooling down when removed—effectively pumping heat out from a cooler to warmer environment. This electrocaloric-based solid state cooling system is quiet and does not use liquid refrigerants. The innovation includes developing nano-structured materials and reliable interfaces for heat exchange. With these innovations and advances in micro/nano-scale manufacturing technologies pioneered by semiconductor companies, UCLA is aiming to extend the performance/reliability of the cooling module.

  6. A COOLING SYSTEM FOR BUIDINGS USING WIND ENERGY

    E-Print Network [OSTI]

    A COOLING SYSTEM FOR BUIDINGS USING WIND ENERGY Hamid Daiyan Islamic Azad University - Semnan Branch, Iran hamid.daiyan@semnaniau.ac.ir Abstract In Iranian historical architecture wind tower is used for cooling and ventilation. Wind tower is a tall structure that stands on building. Wind tower is used

  7. Hybrid Dynamical Systems, or HDS: The Ultimate Switching Experience

    E-Print Network [OSTI]

    Branicky, Michael S.

    Hybrid Dynamical Systems, or HDS: The Ultimate Switching Experience Michael S. Branicky Laboratory concentrated on formalizing the notion of a hybrid system as switching among an indexed collection of dynamical give a quick overview of the area of hybrid systems. I also briefly review the formal definition

  8. Hybrid Systems: Review and Recent Progress Panos J. Antsaklis

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    Hybrid Systems: Review and Recent Progress Panos J. Antsaklis Department of Electrical Engineering of this volume focuses on hybrid dynamical systems, an area of research that has developed as a result communities. This chapter provides a broad-based introduction to hybrid systems and discusses a number

  9. Optimal Control of Switched Hybrid Systems: A Brief Survey

    E-Print Network [OSTI]

    Antsaklis, Panos

    Optimal Control of Switched Hybrid Systems: A Brief Survey Technical Report of the ISIS Group;1 Optimal Control of Switched Hybrid Systems: A Brief Survey Feng Zhu and Panos J. Antsaklis Department a few. The problem of determining optimal control laws for hybrid systems and in particular for switched

  10. Nonlinear Hybrid Dynamical Systems: Modeling, Optimal Control, and Applications

    E-Print Network [OSTI]

    Stryk, Oskar von

    Nonlinear Hybrid Dynamical Systems: Modeling, Optimal Control, and Applications Martin Buss1¨unchen, Germany Abstract. Nonlinear hybrid dynamical systems are the main focus of this paper. A modeling Introduction The recent interest in nonlinear hybrid dynamical systems has forced the merger of two very

  11. APPLICATIONS OF HYBRID GROUND SOURCE HEAT PUMP SYSTEMS TO

    E-Print Network [OSTI]

    APPLICATIONS OF HYBRID GROUND SOURCE HEAT PUMP SYSTEMS TO BUILDINGS AND BRIDGE DECKS. By MAHADEVAN Chapter Page 1. Introduction 1.1. Overview of hybrid ground source heat pump systems 1.2. Literature review 1.3. Thesis objective and scope 2. Optimal sizing of hybrid ground source heat pump system

  12. Comparison of Zone Cooling Load for Radiant and All-Air Conditioning Systems

    E-Print Network [OSTI]

    Feng, Jingjuan; Schiavon, Stefano; Bauman, Fred

    2012-01-01

    Radiant Heating and Cooling Systems. Olesen, B. (2012). "surface heating and cooling systems: . Brussels, EuropeanIn the case of the all-air system, cooling load matches the

  13. Hybrid Renewable Energy Systems for a Dynamically Positioned Buoy

    E-Print Network [OSTI]

    Wood, Stephen L.

    i Hybrid Renewable Energy Systems for a Dynamically Positioned Buoy by Robert Sean Pagliari ________________________ #12; ii We the undersigned committee hereby approve the attached thesis Hybrid Renewable Energy, College of Engineering #12; iii Abstract Hybrid Renewable Energy Systems for a Dynamically Positioned

  14. A Semi-Passive Containment Cooling System Conceptual Design

    E-Print Network [OSTI]

    Liu, H.

    The objective of this project was to investigate a passive containment cooling system (PCCS) for the double concrete containment of the Korean Next Generation Reactor (KNGR). Two conceptual PCCS designs: the thermosyphon ...

  15. March 1, 2013. Campus Wide District Heating & Cooling System

    E-Print Network [OSTI]

    ____________________________ March 1, 2013. Campus Wide District Heating & Cooling System. Today · Decentralisation of the heating plant · Introduction of an Energy Loop · Geothermal 4. Results 5 · Decentralisation of the heating plant · Introduction of an Energy Loop · Geothermal 4. Results 5. Tomorrow 6

  16. System and method for pre-cooling of buildings

    DOE Patents [OSTI]

    Springer, David A.; Rainer, Leo I.

    2011-08-09

    A method for nighttime pre-cooling of a building comprising inputting one or more user settings, lowering the indoor temperature reading of the building during nighttime by operating an outside air ventilation system followed, if necessary, by a vapor compression cooling system. The method provides for nighttime pre-cooling of a building that maintains indoor temperatures within a comfort range based on the user input settings, calculated operational settings, and predictions of indoor and outdoor temperature trends for a future period of time such as the next day.

  17. Benefits of battery-uItracapacitor hybrid energy storage systems

    E-Print Network [OSTI]

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

    2012-01-01

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

  18. Cooling system for three hook ring segment

    DOE Patents [OSTI]

    Campbell, Christian X.; Eng, Darryl; Lee, Ching-Pang; Patat, Harry

    2014-08-26

    A triple hook ring segment including forward, midsection and aft mounting hooks for engagement with respective hangers formed on a ring segment carrier for supporting a ring segment panel, and defining a forward high pressure chamber and an aft low pressure chamber on opposing sides of the midsection mounting hook. An isolation plate is provided on the aft side of the midsection mounting hook to form an isolation chamber between the aft low pressure chamber and the ring segment panel. High pressure air is supplied to the forward chamber and flows to the isolation chamber through crossover passages in the midsection hook. The isolation chamber provides convection cooling air to an aft portion of the ring segment panel and enables a reduction of air pressure in the aft low pressure chamber to reduce leakage flow of cooling air from the ring segment.

  19. Double dark state cooling in a three level system

    E-Print Network [OSTI]

    Javier Cerrillo; Alex Retzker; Martin B. Plenio

    2011-12-29

    A detailed study of a robust and fast laser cooling scheme on a three level system is presented. A special laser configuration, applicable to trapped ions, atoms or cantilevers, designs a quantum interference that eliminates the blue sideband in addition to the carrier transition, thus excluding any heating process involving up to one-phonon processes. As a consequence cooling achieves vanishing phonon occupation up to first order in the Lamb-Dicke parameter expansion. Underlying this scheme is a combined action of two cooling schemes which makes the proposal very stable under fluctuations of the physical parameters such as laser intensity or detuning, making it a viable candidate for experimental implementation. Furthermore, it is considerably faster than existing ground state cooling schemes, overcoming one of the limitations of current quantum information processing implementations. Its suitability as a cooling scheme for several ions in a trap or for a cloud of atoms in a dipole trap is shown.

  20. Active noise canceling system for mechanically cooled germanium radiation detectors

    DOE Patents [OSTI]

    Nelson, Karl Einar; Burks, Morgan T

    2014-04-22

    A microphonics noise cancellation system and method for improving the energy resolution for mechanically cooled high-purity Germanium (HPGe) detector systems. A classical adaptive noise canceling digital processing system using an adaptive predictor is used in an MCA to attenuate the microphonics noise source making the system more deployable.

  1. Reachability Analysis of Stochastic Hybrid Systems: A Biodiesel Production System

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    Reachability Analysis of Stochastic Hybrid Systems: A Biodiesel Production System Derek Riley problem because it provides a formal framework to analyze complex systems. Biodiesel production is a realistic biochemical process that can be modeled and analyzed using SHS methods. Analysis of a biodiesel

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

    E-Print Network [OSTI]

    Baras, John S.

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

  3. Rotary engine cooling system with flow balancing

    SciTech Connect (OSTI)

    Jones, C.

    1987-05-12

    This patent describes a rotary internal combustion engine having a trochoid rotor housing section and having a group of cooling passages extending through a top-dead-center (TDC) region. The engine is characterized by: at least one passage of the group following a curved path which extends through a first hotter portion of the TDC region, by at least one further passage of the group following a substantially uncurved path through a second cooler portion of the TDC region, and by a fluid restriction for restricting fluid flow through the at least one further passage to balance coolant flow between the passages.

  4. Advanced hybrid vehicle propulsion system study

    SciTech Connect (OSTI)

    Schwarz, R.

    1982-05-01

    Results of a study of an advanced heat engine/electric automotive hybrid propulsion system are presented. The system uses a rotary stratified charge engine and an ac motor/controller in a parallel hybrid configuration. The three tasks of the study were (1) parametric studies involving five different vehicle types, (2) design trade-off studies to determine the influence of various vehicle and propulsion system parameters on system performance fuel economy and cost, and (3) a conceptual design establishing feasibility at the selected approach. Energy consumption for the selected system was .034 l/km (61.3 mpg) for the heat engine and .221 kWh/km (.356 kWh/mi) for the electric power system over a modified J227a schedule D driving cycle. Life cycle costs were 7.13 cents/km (11.5 cents/mi) at $2/gal gasoline and 7 cents/kWh electricity for 160,000 km (100,000 mi) life.

  5. Hybrid electric vehicle power management system

    DOE Patents [OSTI]

    Bissontz, Jay E.

    2015-08-25

    Level voltage levels/states of charge are maintained among a plurality of high voltage DC electrical storage devices/traction battery packs that are arrayed in series to support operation of a hybrid electric vehicle drive train. Each high voltage DC electrical storage device supports a high voltage power bus, to which at least one controllable load is connected, and at least a first lower voltage level electrical distribution system. The rate of power transfer from the high voltage DC electrical storage devices to the at least first lower voltage electrical distribution system is controlled by DC-DC converters.

  6. Steam cooling system for a gas turbine

    DOE Patents [OSTI]

    Wilson, Ian David (Mauldin, SC); Barb, Kevin Joseph (Halfmoon, NY); Li, Ming Cheng (Cincinnati, OH); Hyde, Susan Marie (Schenectady, NY); Mashey, Thomas Charles (Coxsackie, NY); Wesorick, Ronald Richard (Albany, NY); Glynn, Christopher Charles (Hamilton, OH); Hemsworth, Martin C. (Cincinnati, OH)

    2002-01-01

    The steam cooling circuit for a gas turbine includes a bore tube assembly supplying steam to circumferentially spaced radial tubes coupled to supply elbows for transitioning the radial steam flow in an axial direction along steam supply tubes adjacent the rim of the rotor. The supply tubes supply steam to circumferentially spaced manifold segments located on the aft side of the 1-2 spacer for supplying steam to the buckets of the first and second stages. Spent return steam from these buckets flows to a plurality of circumferentially spaced return manifold segments disposed on the forward face of the 1-2 spacer. Crossover tubes couple the steam supply from the steam supply manifold segments through the 1-2 spacer to the buckets of the first stage. Crossover tubes through the 1-2 spacer also return steam from the buckets of the second stage to the return manifold segments. Axially extending return tubes convey spent cooling steam from the return manifold segments to radial tubes via return elbows.

  7. System and method for cooling a combustion gas charge

    DOE Patents [OSTI]

    Massey, Mary Cecelia; Boberg, Thomas Earl

    2010-05-25

    The present invention relates to a system and method for cooling a combustion gas charge prior. The combustion gas charge may include compressed intake air, exhaust gas, or a mixture thereof. An evaporator is provided that may then receive a relatively high temperature combustion gas charge and discharge at a relatively lower temperature. The evaporator may be configured to operate with refrigeration cycle components and/or to receive a fluid below atmospheric pressure as the phase-change cooling medium.

  8. American Indian Complex to Cool Off Using Ice Storage System

    Broader source: Energy.gov [DOE]

    In Oklahoma City, summer temperatures can get above 100 degrees, making cooling more of a necessity than a luxury. But the designers of the American Indian Cultural Center and Museum (AICCM) wanted to make cooling choices that reflect American Indian cultures' respect for the land. So, rather than using conventional air-conditioning, the museum's main complex will use an ice storage system estimated to save 644,000 kilowatt hours of electricity a year.

  9. Closed-loop air cooling system for a turbine engine

    DOE Patents [OSTI]

    North, William Edward (Winter Springs, FL)

    2000-01-01

    Method and apparatus are disclosed for providing a closed-loop air cooling system for a turbine engine. The method and apparatus provide for bleeding pressurized air from a gas turbine engine compressor for use in cooling the turbine components. The compressed air is cascaded through the various stages of the turbine. At each stage a portion of the compressed air is returned to the compressor where useful work is recovered.

  10. Recovery act. Development of design and simulation tool for hybrid geothermal heat pump system

    SciTech Connect (OSTI)

    Wang, Shaojie; Ellis, Dan

    2014-05-29

    The ground source heat pump (GSHP) system is one of the most energy efficient HVAC technologies in the current market. However, the heat imbalance may degrade the ability of the ground loop heat exchanger (GLHX) to absorb or reject heat. The hybrid GSHP system, which combines a geothermal well field with a supplemental boiler or cooling tower, can balance the loads imposed on the ground loop heat exchangers to minimize its size while retaining superior energy efficiency. This paper presents a recent simulation-based study with an intention to compare multiple common control strategies used in hybrid GSHP systems, including fixed setpoint, outside air reset, load reset, and wetbulb reset. A small office in Oklahoma City conditioned by a hybrid GSHP system was simulated with the latest version of eQUEST 3.7[1]. The simulation results reveal that the hybrid GSHP system has the excellent capability to meet the cooling and heating setpoints during the occupied hours, balance thermal loads on the ground loop, as well as improve the thermal comfort of the occupants with the undersized well field.

  11. Hybrid quantum-classical models as constrained quantum systems

    E-Print Network [OSTI]

    M. Radonjic; S. Prvanovic; N. Buric

    2012-06-07

    Constrained Hamiltonian description of the classical limit is utilized in order to derive consistent dynamical equations for hybrid quantum-classical systems. Starting with a compound quantum system in the Hamiltonian formulation conditions for classical behavior are imposed on one of its subsystems and the corresponding hybrid dynamical equations are derived. The presented formalism suggests that the hybrid systems have properties that are not exhausted by those of quantum and classical systems.

  12. A Peltier cooling system for SiPM temperature stabilization

    E-Print Network [OSTI]

    Hebbeker, Thomas

    A Peltier cooling system for SiPM temperature stabilization von Simon Nieswand Bachelorarbeit außen thermisch isolierten Kupferblockes einzulassen, an welchen ein Peltier-Element angebracht wird. Um das System zu automatisieren, werden der Temperatursensor und die Stromquelle des Peltier- Elements

  13. Risk-informed design changes for a passive cooling system

    E-Print Network [OSTI]

    Patalano, Giovanbattista

    2007-01-01

    The failure probability of a passive decay heat removal system after a LOCA is evaluated as part of a risk-informed design process for a helium-cooled fast reactor. The system was modeled using RELAP5-3D. The epistemic ...

  14. Modular hybrid plasma reactor and related systems and methods...

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

    Patent Search Success Stories News Events Find More Like This Return to Search Modular hybrid plasma reactor and related systems and methods United States Patent Patent Number:...

  15. Modular hybrid plasma reactor and related systems and methods...

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

    (27) Visual Patent Search Success Stories News Events Return to Search Modular hybrid plasma reactor and related systems and methods United States Patent Application ***...

  16. Thermal Storage with Conventional Cooling Systems 

    E-Print Network [OSTI]

    McGee, E. E.

    1990-01-01

    "Thermal Storage" is a term that describes a mechanical systems ability to sustain normal HVAC operations through a thermal retention source. This system allows for the curtailment of operating major refrigeration equipment during periods of high kw...

  17. Nuclear Hybrid Energy Systems: Challenges and Opportunities

    SciTech Connect (OSTI)

    P. Sabharwall; S.B. Sitton; S.J. Yoon; C. Stoots

    2014-07-01

    With growing demand of energy and costs of the fossil fuels, coupled with the environmental concerns have resulted in an increased interest in alternative energy sources. Nuclear hybrid energy systems (NHES) are being considered which incorporates renewable energy sources such as solar and wind energy combined with nuclear reactor and energy storage to meet the peak hours demand imposed on the grid, along with providing process heat for other potential industrial applications. This concept could potentially satisfy various energy demands and improve reliability, robustness and resilience for the entire system as a whole, along with economic and net efficiency gains. This paper provides a brief understanding of potential NHES system and architecture along with the challenges

  18. Interchange Formats for Hybrid Systems: Review and Proposal

    E-Print Network [OSTI]

    Carloni, Luca

    and formal verification) and synthesis of hybrid systems, and we give a recommendation for an interchange to be powerful design representations for system- level design in particular for embedded controllers. The term: one would prefer to define a common model of computation for hybrid systems that should be used

  19. AN INTRODUCTION TO HYBRID SYSTEM MODELING, ANALYSIS, AND CONTROL

    E-Print Network [OSTI]

    Pappas, George J.

    AN INTRODUCTION TO HYBRID SYSTEM MODELING, ANALYSIS, AND CONTROL JOHN LYGEROS, GEORGE PAPPAS as models of large scale systems. We provide an overview of modeling, analysis, and controller synthesis automatically. Finally, we review a method for designing controllers for hybrid systems with reachability

  20. Radiation detector system having heat pipe based cooling

    DOE Patents [OSTI]

    Iwanczyk, Jan S.; Saveliev, Valeri D.; Barkan, Shaul

    2006-10-31

    A radiation detector system having a heat pipe based cooling. The radiation detector system includes a radiation detector thermally coupled to a thermo electric cooler (TEC). The TEC cools down the radiation detector, whereby heat is generated by the TEC. A heat removal device dissipates the heat generated by the TEC to surrounding environment. A heat pipe has a first end thermally coupled to the TEC to receive the heat generated by the TEC, and a second end thermally coupled to the heat removal device. The heat pipe transfers the heat generated by the TEC from the first end to the second end to be removed by the heat removal device.

  1. Solar Cooling Using Variable Geometry Ejectors Centre for Sustainable Energy Systems

    E-Print Network [OSTI]

    Solar Cooling Using Variable Geometry Ejectors M. Dennis Centre for Sustainable Energy Systems-mail:Mike.Dennis@anu.edu.au ABSTRACT Solar heat driven cooling systems are an attractive concept. The need for cooling is associated with high ambient temperatures. Ejector based cooling systems have been in existence for some time but have

  2. Performance enhancement of a compressive thermoelastic cooling system using multi-objective

    E-Print Network [OSTI]

    Rubloff, Gary W.

    Performance enhancement of a compressive thermoelastic cooling system using multi152 W cooling ca- pacity enhancement evaluated under 10 K waterewater system temperature lift. In addi cooling in this study refers to a solid-state cooling system using shape memory alloys (SMAs), due

  3. Lyapunov-Like Conditions for the Existence of Zeno Behavior in Hybrid and Lagrangian Hybrid Systems

    E-Print Network [OSTI]

    Ames, Aaron

    Lyapunov-Like Conditions for the Existence of Zeno Behavior in Hybrid and Lagrangian Hybrid Systems Andrew Lamperski and Aaron D. Ames Abstract-- Lyapunov-like conditions that utilize generaliza- tions configuration space, we utilize our Lyapunov-like conditions to obtain easily verifiable necessary

  4. Cooling Flows of Self-Gravitating, Rotating, Viscous Systems

    E-Print Network [OSTI]

    Mohsen Shadmehri; Jamshid Ghanbari

    2002-04-06

    We obtain self-similar solutions that describe the dynamics of a self-gravitating, rotating, viscous system. We use simplifying assumptions; but explicitly include viscosity and the cooling due to the dissipation of energy. By assuming that the turbulent dissipation of energy is as power law of the density and the speed v_{rms} and for a power-law dependence of viscosity on the density, pressure, and rotational velocity, we investigate turbulent cooling flows. It has been shown that for the cylindrically and the spherically cooling flows the similarity indices are the same, and they depend only on the exponents of the dissipation rate and the viscosity model. Depending on the values of the exponents, which the mechanisms of the dissipation and viscosity determine them, we may have solutions with different general physical properties. The conservation of the total mass and the angular momentum of the system strongly depends on the mechanisms of energy dissipation and the viscosity model.

  5. Systems Evaluation at the Cool Energy House

    SciTech Connect (OSTI)

    J. Williamson and S. Puttagunta

    2013-09-01

    Steven Winter Associates, Inc. (SWA) monitored several advanced mechanical systems within a 2012 deep energy retrofitted home in the small Orlando suburb of Windermere, FL. This report provides performance results of one of the home's heat pump water heaters (HPWH) and the whole-house dehumidifier (WHD) over a six month period. In addition to assessing the energy performance of these systems, this study sought to quantify potential comfort improvements over traditional systems. This information is applicable to researchers, designers, plumbers, and HVAC contractors. Though builders and homeowners can find useful information within this report, the corresponding case studies are a likely better reference for this audience.

  6. Summary of evaporative cooling system for the SSC silicon tracker

    SciTech Connect (OSTI)

    Woloshun, K.; Barber, R.L.; Christensen, W.; Hanlon, J.A.; Keddy, M.D.; Miller, W.O.; Reid, R.S.; Ziock, H.J.

    1994-10-01

    An evaporative cooling system has been developed for the Superconducting Supercollider (SSC) Solenoidal Detector Collaboration (SDC) and the Gamma, Electron and Muon Detector (GEM) silicon tracker electronics. The system operated on the principles of the heat pipe; specifically, evaporation at near vapor-liquid equilibrium without the presence of noncondensible gases, and with a capillary media used to distribute the working fluid. The system used butane as a working fluid for operation at O{degrees}C and 1 atm. pressure. This paper summarizes the evolution of the system design, emphasizing key developments that may be useful for further work. Results of the system performance as of the close-of-effort are presented. A brief summary of results of experiments using a pumped single-phase cooling system are also presented.

  7. Wind turbine generators having wind assisted cooling systems and cooling methods

    DOE Patents [OSTI]

    Bagepalli, Bharat (Niskayuna, NY); Barnes, Gary R. (Delanson, NY); Gadre, Aniruddha D. (Rexford, NY); Jansen, Patrick L. (Scotia, NY); Bouchard, Jr., Charles G. (Schenectady, NY); Jarczynski, Emil D. (Scotia, NY); Garg, Jivtesh (Cambridge, MA)

    2008-09-23

    A wind generator includes: a nacelle; a hub carried by the nacelle and including at least a pair of wind turbine blades; and an electricity producing generator including a stator and a rotor carried by the nacelle. The rotor is connected to the hub and rotatable in response to wind acting on the blades to rotate the rotor relative to the stator to generate electricity. A cooling system is carried by the nacelle and includes at least one ambient air inlet port opening through a surface of the nacelle downstream of the hub and blades, and a duct for flowing air from the inlet port in a generally upstream direction toward the hub and in cooling relation to the stator.

  8. INCREMENTAL COOLING LOAD DETERMINATION FOR PASSIVE DIRECT GAIN HEATING SYSTEMS

    E-Print Network [OSTI]

    Sullivan, Paul W.

    2013-01-01

    May 27-30, 1981 INCREMENTAL COOLING LOAD DETERMINATION FOR12048 May 1981 INCREMENTAL COOLING LOAD DETERMINATION FORfor increases in the building cooling load resulting from

  9. BETTER DUCT SYSTEMS FOR HOME HEATING AND COOLING.

    SciTech Connect (OSTI)

    ANDREWS,J.

    2001-01-01

    This is a series of six guides intended to provide a working knowledge of residential heating and cooling duct systems, an understanding of the major issues concerning efficiency, comfort, health, and safety, and practical tips on installation and repair of duct systems. These guides are intended for use by contractors, system designers, advanced technicians, and other HVAC professionals. The first two guides are also intended to be accessible to the general reader.

  10. Hybrid vehicle system studies and optimized hydrogen engine design

    SciTech Connect (OSTI)

    Smith, J.R.; Aceves, S.

    1995-04-26

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

  11. Turbine airfoil with an internal cooling system having vortex forming turbulators

    DOE Patents [OSTI]

    Lee, Ching-Pang

    2014-12-30

    A turbine airfoil usable in a turbine engine and having at least one cooling system is disclosed. At least a portion of the cooling system may include one or more cooling channels having a plurality of turbulators protruding from an inner surface and positioned generally nonorthogonal and nonparallel to a longitudinal axis of the airfoil cooling channel. The configuration of turbulators may create a higher internal convective cooling potential for the blade cooling passage, thereby generating a high rate of internal convective heat transfer and attendant improvement in overall cooling performance. This translates into a reduction in cooling fluid demand and better turbine performance.

  12. Air conditioning system with supplemental ice storing and cooling capacity

    DOE Patents [OSTI]

    Weng, Kuo-Lianq (Taichung, TW); Weng, Kuo-Liang (Taichung, TW)

    1998-01-01

    The present air conditioning system with ice storing and cooling capacity can generate and store ice in its pipe assembly or in an ice storage tank particularly equipped for the system, depending on the type of the air conditioning system. The system is characterized in particular in that ice can be produced and stored in the air conditioning system whereby the time of supplying cooled air can be effectively extended with the merit that the operation cycle of the on and off of the compressor can be prolonged, extending the operation lifespan of the compressor in one aspect. In another aspect, ice production and storage in great amount can be performed in an off-peak period of the electrical power consumption and the stored ice can be utilized in the peak period of the power consumption so as to provide supplemental cooling capacity for the compressor of the air conditioning system whereby the shift of peak and off-peak power consumption can be effected with ease. The present air conditioning system can lower the installation expense for an ice-storing air conditioning system and can also be applied to an old conventional air conditioning system.

  13. Comparison of Hybrid Systems and Fluid Stochastic Petri Nets \\Lambda

    E-Print Network [OSTI]

    Tuffin, Bruno

    Comparison of Hybrid Systems and Fluid Stochastic Petri Nets \\Lambda Bruno Tuffin , Dong S. Chen Engineering Duke University, Durham, NC 27708­0291, U.S.A. Abstract. Hybrid Systems are models of interacting digital and continuous devices with applications in the control of aircraft, computers, or modern cars

  14. Performance Analysis of Manufacturing Systems Under Hybrid Control Policies

    E-Print Network [OSTI]

    Gershwin, Stanley B.

    is widely used in practice, and is seen as the \\state of the art" in lean manufacturing. We present severalPerformance Analysis of Manufacturing Systems Under Hybrid Control Policies by Asbjoern M. Bonvik of Manufacturing Systems Under Hybrid Control Policies by Asbjoern M. Bonvik Submitted to the Department

  15. Charge Allocation for Hybrid Electrical Energy Storage Systems

    E-Print Network [OSTI]

    Pedram, Massoud

    Charge Allocation for Hybrid Electrical Energy Storage Systems Qing Xie1, Yanzhi Wang1, Younghyun Hybrid electrical energy storage (HEES) systems, composed of multiple banks of heterogeneous electrical to efficiently store and retrieve electrical energy while attaining performance metrics that are close

  16. Networked Architecture for Hybrid Electrical Energy Storage Systems

    E-Print Network [OSTI]

    Pedram, Massoud

    Networked Architecture for Hybrid Electrical Energy Storage Systems Younghyun Kim, Sangyoung Park, pedram}@usc.edu ABSTRACT A hybrid electrical energy storage (HEES) system that consists of multiple, heterogeneous electrical energy storage (EES) elements is a promising solution to achieve a cost-effective EES

  17. Rapid heating and cooling in two-dimensional Yukawa systems

    E-Print Network [OSTI]

    Yan Feng; Bin Liu; J. Goree

    2011-04-19

    Simulations are reported to investigate solid superheating and liquid supercooling of two-dimensional (2D) systems with a Yukawa interparticle potential. Motivated by experiments where a dusty plasma is heated and then cooled suddenly, we track particle motion using a simulation with Langevin dynamics. Hysteresis is observed when the temperature is varied rapidly in a heating and cooling cycle. As in the experiment, transient solid superheating, but not liquid supercooling, is observed. Solid superheating, which is characterized by solid structure above the melting point, is found to be promoted by a higher rate of temperature increase.

  18. Experimental Studies of NGNP Reactor Cavity Cooling System With Water

    SciTech Connect (OSTI)

    Corradini, Michael; Anderson, Mark; Hassan, Yassin; Tokuhiro, Akira

    2013-01-16

    This project will investigate the flow behavior that can occur in the reactor cavity cooling system (RCCS) with water coolant under the passive cooling-mode of operation. The team will conduct separate-effects tests and develop associated scaling analyses, and provide system-level phenomenological and computational models that describe key flow phenomena during RCCS operation, from forced to natural circulation, single-phase flow and two-phase flow and flashing. The project consists of the following tasks: Task 1. Conduct separate-effects, single-phase flow experiments and develop scaling analyses for comparison to system-level computational modeling for the RCCS standpipe design. A transition from forced to natural convection cooling occurs in the standpipe under accident conditions. These tests will measure global flow behavior and local flow velocities, as well as develop instrumentation for use in larger scale tests, thereby providing proper flow distribution among standpipes for decay heat removal. Task 2. Conduct separate-effects experiments for the RCCS standpipe design as two-phase flashing occurs and flow develops. As natural circulation cooling continues without an ultimate heat sink, water within the system will heat to temperatures approaching saturation , at which point two-phase flashing and flow will begin. The focus is to develop a phenomenological model from these tests that will describe the flashing and flow stability phenomena. In addition, one could determine the efficiency of phase separation in the RCCS storage tank as the two-phase flashing phenomena ensues and the storage tank vents the steam produced. Task 3. Develop a system-level computational model that will describe the overall RCCS behavior as it transitions from forced flow to natural circulation and eventual two-phase flow in the passive cooling-mode of operation. This modeling can then be used to test the phenomenological models developed as a function of scale.

  19. Abstraction and Counterexample-Guided Refinement in Model Checking of Hybrid Systems

    E-Print Network [OSTI]

    : Formal Verification, Abstraction, Model Checking, Hybrid Systems, Refinement, Counterexamples #12Abstraction and Counterexample-Guided Refinement in Model Checking of Hybrid Systems Edmund Clarke a counterexample generated by the model checker. For hybrid systems, analysis of the counterexample requires

  20. Hydraulic tests of emergency cooling system: L-Area

    SciTech Connect (OSTI)

    Hinton, J H

    1988-01-01

    The delay in L-Area startup provided an opportunity to obtain valuable data on the Emergency Cooling System (ECS) which will permit reactor operation at the highest safe power level. ECS flow is a major input to the FLOOD code which calculates reactor ECS power limits. The FLOOD code assesses the effectiveness of the ECS cooling capacity by modeling the core and plenum hydraulics under accident conditions. Presently, reactor power is not limited by the ECS cooling capacity (power limit). However, the manual calculations of ECS flows had been recently updated to include piping changes (debris strainer, valve changes, pressure release systems) and update fitting losses. Both updates resulted in reduced calculated ECS flows. Upon completion of the current program to update, validate, and document, reactor power may be limited under certain situations by ECS cooling capacity for some present reactor charge designs. A series of special hydraulic tests (Reference 1, 3) were conducted in L-Area using all sources of emergency coolant including the ECS pumps (Reference 2). The tests provided empirical hydraulic data on the ECS piping. These data will be used in computer models of the system as well as manual calculations of ECS flows. The improved modeling and accuracy of the flow calculations will permit reactor operation at the highest safe power level with respect to an ECS power limit.

  1. Design and Control of Hydronic Radiant Cooling Systems

    E-Print Network [OSTI]

    Feng, Jingjuan Dove

    2014-01-01

    installed to block solar gain, ISO 11855 cooling capacityinstalled to block solar gain, ISO 11855 cooling capacity

  2. Method and system for powering and cooling semiconductor lasers

    DOE Patents [OSTI]

    Telford, Steven J; Ladran, Anthony S

    2014-02-25

    A semiconductor laser system includes a diode laser tile. The diode laser tile includes a mounting fixture having a first side and a second side opposing the first side and an array of semiconductor laser pumps coupled to the first side of the mounting fixture. The semiconductor laser system also includes an electrical pulse generator thermally coupled to the diode bar and a cooling member thermally coupled to the diode bar and the electrical pulse generator.

  3. Simulation and analysis of district-heating and -cooling systems

    SciTech Connect (OSTI)

    Bloomster, C.H.; Fassbender, L.L.

    1983-03-01

    A computer simulation model, GEOCITY, was developed to study the design and economics of district heating and cooling systems. GEOCITY calculates the cost of district heating based on climate, population, energy source, and financing conditions. The principal input variables are minimum temperature, heating degree-days, population size and density, energy supply temperature and distance from load center, and the interest rate. For district cooling, maximum temperature and cooling degree-hours are required. From this input data the model designs the fluid transport and district heating systems. From this design, GEOCITY calculates the capital and operating costs for the entire system. GEOCITY was originally developed to simulate geothermal district heating systems and thus, in addition to the fluid transport and distribution models, it includes a reservoir model to simulate the production of geothermal energy from geothermal reservoirs. The reservoir model can be adapted to simulate the supply of hot water from any other energy source. GEOCITY has been used extensively and has been validated against other design and cost studies. GEOCITY designs the fluid transport and distribution facilities and then calculates the capital and operating costs for the entire system. GEOCITY can simulate nearly any financial and tax structure through varying the rates of return on equity and debt, the debt-equity ratios, and tax rates. Both private and municipal utility systems can be simulated.

  4. CFD Model Development and validation for High Temperature Gas Cooled Reactor Cavity Cooling System (RCCS) Applications

    SciTech Connect (OSTI)

    Hassan, Yassin; Corradini, Michael; Tokuhiro, Akira; Wei, Thomas Y.C.

    2014-07-14

    The Reactor Cavity Cooling Systems (RCCS) is a passive safety system that will be incorporated in the VTHR design. The system was designed to remove the heat from the reactor cavity and maintain the temperature of structures and concrete walls under desired limits during normal operation (steady-state) and accident scenarios. A small scale (1:23) water-cooled experimental facility was scaled, designed, and constructed in order to study the complex thermohydraulic phenomena taking place in the RCCS during steady-state and transient conditions. The facility represents a portion of the reactor vessel with nine stainless steel coolant risers and utilizes water as coolant. The facility was equipped with instrumentation to measure temperatures and flow rates and a general verification was completed during the shakedown. A model of the experimental facility was prepared using RELAP5-3D and simulations were performed to validate the scaling procedure. The experimental data produced during the steady-state run were compared with the simulation results obtained using RELAP5-3D. The overall behavior of the facility met the expectations. The facility capabilities were confirmed to be very promising in performing additional experimental tests, including flow visualization, and produce data for code validation.

  5. Nuclear Hybrid Energy System Modeling: RELAP5 Dynamic Coupling Capabilities

    SciTech Connect (OSTI)

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

    2012-09-01

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

  6. DRAFT INTERIM REPORT: NATIONAL PROGRAM PLAN FOR PASSIVE AND HYBRID SOLAR HEATING AND COOLING

    E-Print Network [OSTI]

    Authors, Various

    2012-01-01

    etc. Heat Exchangers Heat Pipes & Thermal Diodes ConceptJ. Heat Exchangers K. Heat Pipes & Thermal Diodes A. Conceptwith two control, one heat pipe, and one cooling study. In

  7. Proton corebeam system in the expanding solar wind: Hybrid simulations

    E-Print Network [OSTI]

    California at Berkeley, University of

    Proton corebeam system in the expanding solar wind: Hybrid simulations Petr Hellinger1,2 and Pavel 9 November 2011. [1] Results of a twodimensional hybrid expanding box simulation of a proton to a decrease of the ratio between the proton perpendicular and parallel temperatures as well as to an increase

  8. AT GUANTANAMO BAY: A HYBRID WIND-DIESEL SYSTEM

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    WIND POWER AT GUANTANAMO BAY: A HYBRID WIND-DIESEL SYSTEM FOR THE US NAVY AT GUANTANAMO NAVAL BASE Laboratory and are actively developing what will be the world's largest wind-diesel hybrid electric plant. The pending installation of four 950-kW wind turbines to supplement the 22.8 MW diesel electricity plant

  9. Floating Loop System For Cooling Integrated Motors And Inverters Using Hot Liquid Refrigerant

    DOE Patents [OSTI]

    Hsu, John S [Oak Ridge, TN; Ayers, Curtis W [Kingston, TN; Coomer, Chester [Knoxville, TN; Marlino, Laura D [Oak Ridge, TN

    2006-02-07

    A floating loop vehicle component cooling and air-conditioning system having at least one compressor for compressing cool vapor refrigerant into hot vapor refrigerant; at least one condenser for condensing the hot vapor refrigerant into hot liquid refrigerant by exchanging heat with outdoor air; at least one floating loop component cooling device for evaporating the hot liquid refrigerant into hot vapor refrigerant; at least one expansion device for expanding the hot liquid refrigerant into cool liquid refrigerant; at least one air conditioning evaporator for evaporating the cool liquid refrigerant into cool vapor refrigerant by exchanging heat with indoor air; and piping for interconnecting components of the cooling and air conditioning system.

  10. Cooling atom-cavity systems into entangled states

    E-Print Network [OSTI]

    J. Busch; S. De; S. S. Ivanov; B. T. Torosov; T. P. Spiller; A. Beige

    2011-05-25

    Generating entanglement by simply cooling a system into a stationary state which is highly entangled has many advantages. Schemes based on this idea are robust against parameter fluctuations, tolerate relatively large spontaneous decay rates, and achieve high fidelities independent of their initial state. A possible implementation of this idea in atom-cavity systems has recently been proposed by Kastoryano et al. [Phys. Rev. Lett. 106, 090502 (2011)]. Here we propose an improved entanglement cooling scheme for two atoms inside an optical cavity which achieves higher fidelities for comparable single-atom cooperativity parameters C. For example, we predict fidelities above 90% even for C as low as 20 without requiring individual laser addressing and without having to detect photons.

  11. Quantum Friction: Cooling Quantum Systems with Unitary Time Evolution

    E-Print Network [OSTI]

    Aurel Bulgac; Michael McNeil Forbes; Kenneth J. Roche; Gabriel Wlaz?owski

    2013-05-29

    We introduce a type of quantum dissipation -- local quantum friction -- by adding to the Hamiltonian a local potential that breaks time-reversal invariance so as to cool the system. Unlike the Kossakowski-Lindblad master equation, local quantum friction directly effects unitary evolution of the wavefunctions rather than the density matrix: it may thus be used to cool fermionic many-body systems with thousands of wavefunctions that must remain orthogonal. In addition to providing an efficient way to simulate quantum dissipation and non-equilibrium dynamics, local quantum friction coupled with adiabatic state preparation significantly speeds up many-body simulations, making the solution of the time-dependent Schr\\"odinger equation significantly simpler than the solution of its stationary counterpart.

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

    DOE Patents [OSTI]

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

    2009-02-10

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

  13. NASA's Marshall Space Flight Center Improves Cooling System Performance

    SciTech Connect (OSTI)

    2011-02-22

    National Aeronautics and Space Administration’s (NASA) Marshall Space Flight Center (MSFC) has a longstanding sustainability program that revolves around energy and water efficiency as well as environmental protection. MSFC identified a problematic cooling loop with six separate compressor heat exchangers and a history of poor efficiency. The facility engineering team at MSFC partnered with Flozone Services, Incorporated to implement a comprehensive water treatment platform to improve the overall efficiency of the system.

  14. Heating and Cooling System Support Equipment Basics | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: Alternative Fuelsof Energy ServicesContracting OversightEMS Policyand Cooling System Support

  15. CALIFORNIA ENERGY COMMISSION STAFF COOLING WATER MANAGEMENT

    E-Print Network [OSTI]

    are usually associated with building heating, ventilating, and air conditioning (HVAC) systems to be due to Legionella growth in the plant's cooling system (34). The American Society of Heating GUIDELINES For Wet and Hybrid Cooling Towers at Power Plants MAY 17, 2004 DRAFTGUIDELINES NOVEMBER 2005 CEC

  16. Improving the Efficiency of Your Process Cooling System 

    E-Print Network [OSTI]

    Baker, R.

    2005-01-01

    Many industries require process cooling to achieve desired outcomes of specific processes. This cooling may come from cooling towers, once-through water, mechanical refrigeration, or cryogenic sources such as liquid nitrogen or dry ice. This paper...

  17. Optica Applicata, Vol. XXXVI, No. 4, 2006 A system for magnetooptical cooling

    E-Print Network [OSTI]

    Optica Applicata, Vol. XXXVI, No. 4, 2006 A system for magnetooptical cooling and trapping of Rb@ifpan.edu.pl A system for magnetooptical cooling and trapping of Rb atoms built in our laboratory (at Institute recent monographs [6, 7]). The backbone system, widely used for cooling and trapping neutral atoms

  18. User-friendly and intuitive graphical approach to the design of thermoelectric cooling systems

    E-Print Network [OSTI]

    User-friendly and intuitive graphical approach to the design of thermoelectric cooling systems)-based active cooling system, including the heatsink role. The method is simple and intuitive and provides com- prehensive information about the cooling system such as its feasibility, required heatsink, the TEC current

  19. OPTIMAL CONTROL OF THE COOLING SYSTEM IN HEAVY VEHICLES1 Niklas Petterssona,b

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    OPTIMAL CONTROL OF THE COOLING SYSTEM IN HEAVY VEHICLES1 Niklas Petterssona,b , Karl Henrik is supported by Scania CV AB and PFF. This paper presents a study on cooling system control in heavy vehicles physical layouts. The outline of the paper is as follows: In section 2 the cooling system is described

  20. Adaptive Thermal Management for Portable System Batteries by Forced Convection Cooling

    E-Print Network [OSTI]

    Pedram, Massoud

    Adaptive Thermal Management for Portable System Batteries by Forced Convection Cooling Qing Xie a portable system. Since the cooling fan is also powered by the same battery, it is critical to develop thermal management problem for batteries (ATMB) in the portable systems with forced convection cooling

  1. Impact of material system thermomechanics and thermofluid performance on He-cooled ceramic

    E-Print Network [OSTI]

    Abdou, Mohamed

    Impact of material system thermomechanics and thermofluid performance on He-cooled ceramic breeder program for high temperature gas-cooled blanket systems using SiCf /SiC as a structural material. Current as with helium-cooled ceramic breeder blanket systems. Thus, both the design and issue relevant R&D emphasis

  2. Review and Projections of Integrated Cooling Systems for Three-Dimensional

    E-Print Network [OSTI]

    Kandlikar, Satish

    Review and Projections of Integrated Cooling Systems for Three-Dimensional Integrated Circuits and integrated cooling systems. For heat fluxes of 50­100 W/cm2 on each side of a chip in a 3D IC package outstanding issues in the cooling system design were outlined. Before reviewing available literature

  3. A Simple and Intuitive Graphical Approach to the Design of Thermoelectric Cooling Systems

    E-Print Network [OSTI]

    A Simple and Intuitive Graphical Approach to the Design of Thermoelectric Cooling Systems Simon, thermoelectric active cooling systems can help maintain electronic devices at a desired temperature condition for calculating the steady-state operational point of a TEC based active cooling system, including the heatsink

  4. Refinement of Hybrid Systems from Formal Models to Design Languages

    E-Print Network [OSTI]

    Cengarle, María Victoria

    of high-level design of a control system, it is highly desirable to use representations that accuratelyRefinement of Hybrid Systems from Formal Models to Design Languages Jan Romberg Systems & Software Abstract System-level design for discrete-continuous embedded systems is a complex and error- prone task

  5. POOL WATER TREATMENT AND COOLING SYSTEM DESCRIPTION DOCUMENT

    SciTech Connect (OSTI)

    V. King

    2000-06-19

    The Pool Water Treatment and Cooling System is located in the Waste Handling Building (WHB), and is comprised of various process subsystems designed to support waste handling operations. This system maintains the pool water temperature within an acceptable range, maintains water quality standards that support remote underwater operations and prevent corrosion, detects leakage from the pool liner, provides the capability to remove debris from the pool, controls the pool water level, and helps limit radiological exposure to personnel. The pool structure and liner, pool lighting, and the fuel staging racks in the pool are not within the scope of the Pool Water Treatment and Cooling System. Pool water temperature control is accomplished by circulating the pool water through heat exchangers. Adequate circulation and mixing of the pool water is provided to prevent localized thermal hotspots in the pool. Treatment of the pool water is accomplished by a water treatment system that circulates the pool water through filters, and ion exchange units. These water treatment units remove radioactive and non-radioactive particulate and dissolved solids from the water, thereby providing the water clarity needed to conduct waste handling operations. The system also controls pool water chemistry to prevent advanced corrosion of the pool liner, pool components, and fuel assemblies. Removal of radioactivity from the pool water contributes to the project ALARA (as low as is reasonably achievable) goals. A leak detection system is provided to detect and alarm leaks through the pool liner. The pool level control system monitors the water level to ensure that the minimum water level required for adequate radiological shielding is maintained. Through interface with a demineralized water system, adequate makeup is provided to compensate for loss of water inventory through evaporation and waste handling operations. Interface with the Site Radiological Monitoring System provides continuous radiological monitoring of the pool water. The Pool Water Treatment and Cooling System interfaces with the Waste Handling Building System, Site-Generated Radiological Waste Handling System, Site Radiological Monitoring System, Waste Handling Building Electrical System, Site Water System, and the Monitored Geologic Repository Operations Monitoring and Control System.

  6. Control system design for a parallel hybrid electric vehicle 

    E-Print Network [OSTI]

    Buntin, David Leighton

    1994-01-01

    This thesis addresses the design of control systems for a parallel hybrid electric drive train which is an alternative to conventional passenger vehicles. The principle components of the drive train are a small internal combustion engine...

  7. Bayesian regularisation methods in a hybrid MLP-HMM system

    E-Print Network [OSTI]

    Renals, Steve; MacKay, David

    1993-01-01

    We have applied Bayesian regularisation methods to multi-layer percepuon (MLP) training in the context of a hybrid MLP-HMM (hidden Markov model) continuous speech recognition system. The Bayesian framework adopted here ...

  8. The assessment of battery-ultracapacitor hybrid energy storage systems

    E-Print Network [OSTI]

    He, Yiou

    2014-01-01

    Battery-ultracapacitors hybrid energy storage systems (ESS) could combine the high power density and high life cycle of ultracapacitors with the high energy density of batteries, which forms a promising energy storage ...

  9. Active cooling for downhole instrumentation: Preliminary analysis and system selection

    SciTech Connect (OSTI)

    Bennett, G.A.

    1988-03-01

    A feasibility study and a series of preliminary designs and analyses were done to identify candidate processes or cycles for use in active cooling systems for downhole electronic instruments. A matrix of energy types and their possible combinations was developed and the energy conversion process for each pari was identified. The feasibility study revealed conventional as well as unconventional processes and possible refrigerants and identified parameters needing further clarifications. A conceptual design or series od oesigns for each system was formulated and a preliminary analysis of each design was completed. The resulting coefficient of performance for each system was compared with the Carnot COP and all systems were ranked by decreasing COP. The system showing the best combination of COP, exchangeability to other operating conditions, failure mode, and system serviceability is chosen for use as a downhole refrigerator. 85 refs., 48 figs., 33 tabs.

  10. Passive-solar directional-radiating cooling system

    DOE Patents [OSTI]

    Hull, John R. (Hinsdale, IL); Schertz, William W. (Batavia, IL)

    1986-01-01

    A radiative cooling system for use with an ice-making system having a radiating surface aimed at the sky for radiating energy at one or more wavelength bands for which the atmosphere is transparent and a cover thermally isolated from the radiating surface and transparent at least to the selected wavelength or wavelengths, the thermal isolation reducing the formation of condensation on the radiating surface and/or cover and permitting the radiation to continue when the radiating surface is below the dewpoint of the atmosphere, and a housing supporting the radiating surface, cover and heat transfer means to an ice storage reservoir.

  11. System and method for cooling a super-conducting device

    DOE Patents [OSTI]

    Bray, James William (Niskayuna, NY); Steinbach, Albert Eugene (Schenectady, NY); Dawson, Richard Nils (Voorheesville, NY); Laskaris, Evangelos Trifon (Schenectady, NY); Huang, Xianrul (Clifton Park, NY)

    2008-01-08

    A system and method for cooling a superconductive rotor coil. The system comprises a rotatable shaft coupled to the superconductive rotor coil. The rotatable shaft may comprise an axial passageway extending through the rotatable shaft and a first passageway extending through a wall of the rotatable shaft to the axial passageway. The axial passageway and the first passageway are operable to convey a cryogenic fluid to the superconductive rotor coil through the wall of the rotatable shaft. A cryogenic transfer coupling may be provided to supply cryogenic fluid to the first passageway.

  12. Passive-solar directional-radiating cooling system

    DOE Patents [OSTI]

    Hull, J.R.; Schertz, W.W.

    1985-06-27

    A radiative cooling system for use with an ice-making system having a radiating surface aimed at the sky for radiating energy at one or more wavelength bands for which the atmosphere is transparent and a cover thermally isolated from the radiating surface and transparent at least to the selected wavelength or wavelengths, the thermal isolation reducing the formation of condensation on the radiating surface and/or cover and permitting the radiation to continue when the radiating surface is below the dewpoint of the atmosphere, and a housing supporting the radiating surface, cover and heat transfer means to an ice storage reservoir.

  13. Cooling and control of a cavity opto-electromechanical system

    E-Print Network [OSTI]

    Kwan H. Lee; Terry G. McRae; Glen I. Harris; Joachim Knittel; Warwick P. Bowen

    2010-02-11

    We implement a cavity opto-electromechanical system integrating electrical actuation capabilities of nanoelectromechanical devices with ultrasensitive mechanical transduction achieved via intra-cavity optomechanical coupling. Electrical gradient forces as large as 0.40 microN are realized, with simultaneous mechanical transduction sensitivity of 1.5 X 10^-18 m/rtHz representing a three orders of magnitude improvement over any nanoelectromechanical system to date. Opto-electromechanical feedback cooling is demonstrated, exhibiting strong squashing of the in-loop transduction signal. Out-of-loop transduction provides accurate temperature calibration even in the critical paradigm where measurement backaction induces opto-mechanical correlations.

  14. System Study: Reactor Core Isolation Cooling 1998–2012

    SciTech Connect (OSTI)

    T. E. Wierman

    2013-10-01

    This report presents an unreliability evaluation of the reactor core isolation cooling (RCIC) system at 31 U.S. commercial boiling water reactors. Demand, run hours, and failure data from fiscal year 1998 through 2012 for selected components were obtained from the Equipment Performance and Information Exchange (EPIX). The unreliability results are trended for the most recent 10 year period while yearly estimates for system unreliability are provided for the entire active period. No statistically significant increasing trend was identified in the HPCI results. Statistically significant decreasing trends were identified for RCIC start-only and 8-hour trends.

  15. Optimal Controllers for Hybrid Systems: Stability and Piecewise Linear Explicit Form

    E-Print Network [OSTI]

    Sontag, Eduardo

    of the heat exchange system [16] shows the potential of the method. Keywords: Hybrid systems, model predictiveOptimal Controllers for Hybrid Systems: Stability and Piecewise Linear Explicit Form A. Bemporad for hybrid sys- tems and investigate conditions for closed-loop stabil- ity. Hybrid systems are modeled

  16. Three-dimensional neutronics optimization of helium-cooled blanket for multi-functional experimental fusion-fission hybrid reactor (FDS-MFX)

    SciTech Connect (OSTI)

    Jiang, J.; Yuan, B.; Jin, M.; Wang, M.; Long, P.; Hu, L.

    2012-07-01

    Three-dimensional neutronics optimization calculations were performed to analyse the parameters of Tritium Breeding Ratio (TBR) and maximum average Power Density (PDmax) in a helium-cooled multi-functional experimental fusion-fission hybrid reactor named FDS (Fusion-Driven hybrid System)-MFX (Multi-Functional experimental) blanket. Three-stage tests will be carried out successively, in which the tritium breeding blanket, uranium-fueled blanket and spent-fuel-fueled blanket will be utilized respectively. In this contribution, the most significant and main goal of the FDS-MFX blanket is to achieve the PDmax of about 100 MW/m3 with self-sustaining tritium (TBR {>=} 1.05) based on the second-stage test with uranium-fueled blanket to check and validate the demonstrator reactor blanket relevant technologies based on the viable fusion and fission technologies. Four different enriched uranium materials were taken into account to evaluate PDmax in subcritical blanket: (i) natural uranium, (ii) 3.2% enriched uranium, (iii) 19.75% enriched uranium, and (iv) 64.4% enriched uranium carbide. These calculations and analyses were performed using a home-developed code VisualBUS and Hybrid Evaluated Nuclear Data Library (HENDL). The results showed that the performance of the blanket loaded with 64.4% enriched uranium was the most attractive and it could be promising to effectively obtain tritium self-sufficiency (TBR-1.05) and a high maximum average power density ({approx}100 MW/m{sup 3}) when the blanket was loaded with the mass of {sup 235}U about 1 ton. (authors)

  17. The Helium Cooling System and Cold Mass Support System for theMICE Coupling Solenoid

    SciTech Connect (OSTI)

    Wang, L.; Wu, H.; Li, L.K.; Green, M.A.; Liu, C.S.; Li, L.Y.; Jia, L.X.; Virostek, S.P.

    2007-08-27

    The MICE cooling channel consists of alternating threeabsorber focus coil module (AFC) and two RF coupling coil module (RFCC)where the process of muon cooling and reacceleration occurs. The RFCCmodule comprises a superconducting coupling solenoid mounted around fourconventional conducting 201.25 MHz closed RF cavities and producing up to2.2T magnetic field on the centerline. The coupling coil magnetic fieldis to produce a low muon beam beta function in order to keep the beamwithin the RF cavities. The magnet is to be built using commercialniobium titanium MRI conductors and cooled by pulse tube coolers thatproduce 1.5 W of cooling capacity at 4.2 K each. A self-centering supportsystem is applied for the coupling magnet cold mass support, which isdesigned to carry a longitudinal force up to 500 kN. This report willdescribe the updated design for the MICE coupling magnet. The cold masssupport system and helium cooling system are discussed indetail.

  18. Hybrid Statistical Model Checking Technique for Reliable Safety Critical Systems

    E-Print Network [OSTI]

    @cs.kaist.ac.kr Abstract--Reliability of safety critical systems such as nuclear power plants and automobiles has become1 Hybrid Statistical Model Checking Technique for Reliable Safety Critical Systems Youngjoo Kim a significant issue to our society. As more computing systems are utilized in these safety critical systems

  19. Hybrid sulfur cycle operation for high-temperature gas-cooled reactors

    DOE Patents [OSTI]

    Gorensek, Maximilian B

    2015-02-17

    A hybrid sulfur (HyS) cycle process for the production of hydrogen is provided. The process uses a proton exchange membrane (PEM) SO.sub.2-depolarized electrolyzer (SDE) for the low-temperature, electrochemical reaction step and a bayonet reactor for the high-temperature decomposition step The process can be operated at lower temperature and pressure ranges while still providing an overall energy efficient cycle process.

  20. Photothermal Self-Oscillation and Laser Cooling of Graphene Optomechanical Systems

    E-Print Network [OSTI]

    McEuen, Paul L.

    Photothermal Self-Oscillation and Laser Cooling of Graphene Optomechanical Systems Robert A. Barton systems (NEMS), photothermal force, laser cooling, self-oscillation Optomechanics,1,2 which uses optical that a continuous wave laser can be used to cool a graphene vibrational mode or to power a graphene-based tunable

  1. Optimal Scheduling for Biocide and Heat Exchangers Maintenance Towards Environmentally Friendly Seawater Cooling Systems 

    E-Print Network [OSTI]

    Binmahfouz, Abdullah

    2012-10-19

    FOR SEAWATER-COOLED POWER AND DESALINATION PLANTS....................................................... 127 5.1 Overview .............................................................................................. 127 5.2 Introduction... 5.2 Representation of a Once-Thorough Cooling System................................ 141 5.3 An Overall Representation of the Power/Desalination Plant ..................... 152 5.4 The Cooling System for the Case Study...

  2. Impact of Different Glazing Systems on Cooling Load of a Detached Residential Building at Bhubaneswar, India 

    E-Print Network [OSTI]

    Sahoo, P. K.; Sahoo, R.

    2010-01-01

    on solar heat gain and cooling load. The simulation results show reductions in solar heat gain, cooling load and better thermal comfort can be achieved using proper glazing systems for a specific orientation of the building. The significance...

  3. Impact of Solar Heat Gain on Radiant Floor Cooling System Design

    E-Print Network [OSTI]

    Feng, Jingjuan Dove; Schiavon, Stefano; Bauman, Fred

    2013-01-01

    7] B. Borresen, Floor heating and cooling of an atrium, in:thermal performance of floor heating systems, Solar Energy,discussed this issue for floor heating, but not cooling.

  4. Hydraulic Modeling of Large District Cooling Systems for Master Planning Purposes 

    E-Print Network [OSTI]

    Xu, C.; Chen, Q.; Claridge, D. E.; Turner, W. D.; Deng, S.

    2006-01-01

    District Cooling Systems for Master Planning Purposes Chen Xu Qiang Chen David E. Claridge Dan Turner Song Deng Energy Systems Laboratory Texas A&M University College Station, TX 77843-3581 KEYWORD Pipe Network, District Cooling System, Central... Chilled Water System, Master Planning, Hydraulic Simulation ABSTRACT District Cooling Systems (DCS) have been widely applied in large institutions such as universities, government facilities, commercial districts, airports etc. The hydraulic system of a...

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

    E-Print Network [OSTI]

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

    2012-01-01

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

  6. System and method for cooling a superconducting rotary machine

    DOE Patents [OSTI]

    Ackermann, Robert Adolf (Schenectady, NY); Laskaris, Evangelos Trifon (Schenectady, NY); Huang, Xianrui (Clifton Park, NY); Bray, James William (Niskayuna, NY)

    2011-08-09

    A system for cooling a superconducting rotary machine includes a plurality of sealed siphon tubes disposed in balanced locations around a rotor adjacent to a superconducting coil. Each of the sealed siphon tubes includes a tubular body and a heat transfer medium disposed in the tubular body that undergoes a phase change during operation of the machine to extract heat from the superconducting coil. A siphon heat exchanger is thermally coupled to the siphon tubes for extracting heat from the siphon tubes during operation of the machine.

  7. Introduction to the Special Issue on Hybrid Systems Hybrid systems contain two distinct types of components, subsystems with continuous dynamics and subsystems

    E-Print Network [OSTI]

    Antsaklis, Panos

    to be analyzed and understood. Hybrid systems are central in the analysis and design of intelligent control the dynamic behavior of such hybrid systems. In this way it will be possible to develop control strategies. In recent years, the widespread use of digital machines has made hybrid systems very common. Whenever

  8. Reachability Analysis of a Biodiesel Production System Using Stochastic Hybrid Systems

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    Reachability Analysis of a Biodiesel Production System Using Stochastic Hybrid Systems Derek Riley defines the creation of biodiesel from soybean oil and methanol. Modeling and analyzing the biodiesel. In this paper we model a biodiesel production system as a stochastic hybrid system, and we present

  9. East Bank District Heating-to-Cooling Conversion Plan Check the date your building's cooling system is scheduled to be on.

    E-Print Network [OSTI]

    Webb, Peter

    East Bank District Heating-to-Cooling Conversion Plan Check the date your building's cooling system Coal Storage Building 39 NA Cooke Hall 56 Donhowe Building 044 East Gateway District Steam Distr. 199

  10. Hybrid Electric Systems | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum12,ExecutiveFinancingR Walls - BuildingofDepartmentHybird Geothemal-SolarHybrid

  11. Hybrid energy system cost analysis: San Nicolas Island, California

    SciTech Connect (OSTI)

    Olsen, T.L.; McKenna, E.

    1996-07-01

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

  12. Hydrogen atom as a quantum-classical hybrid system

    E-Print Network [OSTI]

    Fei Zhan; Biao Wu

    2013-02-15

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

  13. UNIVERSITY OF CALIFORNIA, SAN DIEGO Temperature and Cooling Management in Computing Systems

    E-Print Network [OSTI]

    Simunic, Tajana

    UNIVERSITY OF CALIFORNIA, SAN DIEGO Temperature and Cooling Management in Computing Systems . . . . . . . . . . . 3 1.2 Related work on cooling management . . . . . . . . . . . 5 1.3 Thesis contributions . . . . . . . . . . . . . . . . . . . . . . 39 Chapter 4 Thermal and Cooling Management in Multisocket CPU Servers 41 4.1 Multi-tier thermal

  14. Cooling a quantum circuit via coupling to a multiqubit system

    E-Print Network [OSTI]

    Mihai A. Macovei

    2010-04-19

    The cooling effects of a quantum LC circuit coupled inductively with an ensemble of artificial qubits are investigated. The particles may decay independently or collectively through their interaction with the environmental vacuum electromagnetic field reservoir. For appropriate bath temperatures and the resonator's quality factors, we demonstrate an effective cooling well below the thermal background. In particular, we found that for larger samples the cooling efficiency is better for independent qubits. However, the cooling process can be faster for collectively interacting particles.

  15. Thermoelectric generator cooling system and method of control

    DOE Patents [OSTI]

    Prior, Gregory P; Meisner, Gregory P; Glassford, Daniel B

    2012-10-16

    An apparatus is provided that includes a thermoelectric generator and an exhaust gas system operatively connected to the thermoelectric generator to heat a portion of the thermoelectric generator with exhaust gas flow through the thermoelectric generator. A coolant system is operatively connected to the thermoelectric generator to cool another portion of the thermoelectric generator with coolant flow through the thermoelectric generator. At least one valve is controllable to cause the coolant flow through the thermoelectric generator in a direction that opposes a direction of the exhaust gas flow under a first set of operating conditions and to cause the coolant flow through the thermoelectric generator in the direction of exhaust gas flow under a second set of operating conditions.

  16. The HYCOM (HYbrid Coordinate Ocean Model) data assimilative system

    E-Print Network [OSTI]

    Carolina, Rutgers, U. of South Florida, Fugro- GEOS, ROFFS, Orbimage, Shell, ExxonMobil. 0924-7963/$ - seeThe HYCOM (HYbrid Coordinate Ocean Model) data assimilative system Eric P. Chassignet a,, Harley E and basin-scale ocean hindcast, nowcast, and prediction system in the context of the Global Ocean Data

  17. Aircraft AC Generators: Hybrid System Modeling and Simulation

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    generator, phase-domain model, synchronous AC generator. I. INTRODUCTION The Integrated Drive Generator (IDG1 Aircraft AC Generators: Hybrid System Modeling and Simulation Ashraf Tantawy, Student Member--Integrated Drive Generators (IDGs) are the main source of electrical power for a number of critical systems

  18. Luminescence properties of the hybrid Si-Ni nanoparticles system

    E-Print Network [OSTI]

    Lalayan, A A; Movsesyan, H A

    2015-01-01

    The luminescence properties of the colloidal hybrid Si - Ni nanoparticles system fabricated in the pure water by pulsed laser ablation is considered. The red-shifted photoluminescence of this system because of the Stark effect in the Coulomb field of the charged Ni nanoparticles has been registered in the blue range of the spectrum.

  19. Hybrid Braking System for Non-Drive Axles | Department of Energy

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

    Braking System for Non-Drive Axles Hybrid Braking System for Non-Drive Axles A hybrid braking system is designed to conserve diesel fuel (or alternative fuels) by using...

  20. Dynamic Reconfiguration of Photovoltaic Energy Harvesting System in Hybrid Electric Vehicles

    E-Print Network [OSTI]

    Pedram, Massoud

    Dynamic Reconfiguration of Photovoltaic Energy Harvesting System in Hybrid Electric Vehicles Yanzhi, xuelin, pedram}@usc.edu, 2 {naehyuck}@elpl.snu.ac.kr ABSTRACT Photovoltaic (PV) energy harvesting system. Keywords Photovoltaic System, Hybrid Electric Vehicle, Photovoltaic Array Reconfiguration, Dynamic

  1. Hydraulic Hybrid Systems | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: Energy Resources JumpNewTexas: EnergyHunterdonHutto,Fuel Cell Corporation JumpHybrid

  2. hybrid vehicle systems | netl.doe.gov

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorkingLosThe 26th AnnualHistory Over 100 Years5/04 |3 The Retrieval ofHybrid

  3. Evaluation of cooling performance of thermally activated building system with evaporative cooling source for typical United States climates

    E-Print Network [OSTI]

    Feng, Jingjuan; Bauman, Fred

    2013-01-01

    and high temperature cooling_REHVA Guidebook, Federation ofEvaluation of cooling performance of thermally activatedsystem with evaporative cooling source for typical United

  4. Annual DOE active solar heating and cooling contractors' review meeting. Premeeting proceedings and project summaries

    SciTech Connect (OSTI)

    None,

    1981-09-01

    Ninety-three project summaries are presented which discuss the following aspects of active solar heating and cooling: Rankine solar cooling systems; absorption solar cooling systems; desiccant solar cooling systems; solar heat pump systems; solar hot water systems; special projects (such as the National Solar Data Network, hybrid solar thermal/photovoltaic applications, and heat transfer and water migration in soils); administrative/management support; and solar collector, storage, controls, analysis, and materials technology. (LEW)

  5. Sealed Battery Block Provided With A Cooling System

    DOE Patents [OSTI]

    Verhoog, Roelof (Bordeaux, FR); Barbotin, Jean-Loup (Pompignac, FR)

    1999-11-16

    The present invention relates to a sealed battery block operating at a pressure of at least 1 bar relative, the battery including a container made of a plastics material and made up of a lid and of a case subdivided into wells by at least one partition, said battery being provided with a cooling system including two cheek plates made of a plastics material and co-operating with the outside faces of respective ones of two opposite walls of said case, each cheek plate co-operating with the corresponding wall to define a compartment provided with a plurality of ribs forming baffles for fluid flow purposes, and with an inlet orifice and an outlet orifice for the fluid, said battery being characterized in that each of said ribs extends in a direction that forms an angle relative to the plane of said partition lying in the range 60.degree. to 90.degree..

  6. Thermochemically recuperated and steam cooled gas turbine system

    DOE Patents [OSTI]

    Viscovich, P.W.; Bannister, R.L.

    1995-07-11

    A gas turbine system is described in which the expanded gas from the turbine section is used to generate the steam in a heat recovery steam generator and to heat a mixture of gaseous hydrocarbon fuel and the steam in a reformer. The reformer converts the hydrocarbon gas to hydrogen and carbon monoxide for combustion in a combustor. A portion of the steam from the heat recovery steam generator is used to cool components, such as the stationary vanes, in the turbine section, thereby superheating the steam. The superheated steam is mixed into the hydrocarbon gas upstream of the reformer, thereby eliminating the need to raise the temperature of the expanded gas discharged from the turbine section in order to achieve effective conversion of the hydrocarbon gas. 4 figs.

  7. Thermochemically recuperated and steam cooled gas turbine system

    DOE Patents [OSTI]

    Viscovich, Paul W. (Longwood, FL); Bannister, Ronald L. (Winter Springs, FL)

    1995-01-01

    A gas turbine system in which the expanded gas from the turbine section is used to generate the steam in a heat recovery steam generator and to heat a mixture of gaseous hydrocarbon fuel and the steam in a reformer. The reformer converts the hydrocarbon gas to hydrogen and carbon monoxide for combustion in a combustor. A portion of the steam from the heat recovery steam generator is used to cool components, such as the stationary vanes, in the turbine section, thereby superheating the steam. The superheated steam is mixed into the hydrocarbon gas upstream of the reformer, thereby eliminating the need to raise the temperature of the expanded gas discharged from the turbine section in order to achieve effective conversion of the hydrocarbon gas.

  8. Comparative Study Between Air-Cooled and Water-Cooled Condensers of the Air-Conditioning Systems 

    E-Print Network [OSTI]

    Maheshwari, G. P.; Mulla Ali, A. A.

    2004-01-01

    The weather in Kuwait is very dry where the dry-bulb temperature exceeds the wet-bulb temperature more than 20oC in most of the summer months. Thus, the air-conditioning (A/C) system with the water-cooled (WC) condensers is expected to perform more...

  9. Cooling system having reduced mass pin fins for components in a gas turbine engine

    DOE Patents [OSTI]

    Lee, Ching-Pang; Jiang, Nan; Marra, John J

    2014-03-11

    A cooling system having one or more pin fins with reduced mass for a gas turbine engine is disclosed. The cooling system may include one or more first surfaces defining at least a portion of the cooling system. The pin fin may extend from the surface defining the cooling system and may have a noncircular cross-section taken generally parallel to the surface and at least part of an outer surface of the cross-section forms at least a quartercircle. A downstream side of the pin fin may have a cavity to reduce mass, thereby creating a more efficient turbine airfoil.

  10. Performance Evaluation for a Modular, Scalable Passive Cooling System in Data Centers

    E-Print Network [OSTI]

    Xu, TengFang

    2009-01-01

    3. Modius OpenData ® Data Center infrastructure Manager,Passive Cooling System in Data Centers Final Report To TheDATA CENTERS

  11. Performance Evaluation for Modular, Scalable Liquid-Rack Cooling Systems in Data Centers

    E-Print Network [OSTI]

    Xu, TengFang

    2009-01-01

    3. Modius OpenData ® Data Center infrastructure Manager,Rack Cooling Systems in Data Centers Final Report To TheDATA CENTERS ..

  12. Performance Evaluation for Modular, Scalable Overhead Cooling Systems In Data Centers

    E-Print Network [OSTI]

    Xu, TengFang T.

    2009-01-01

    3. Modius OpenData ® Data Center infrastructure Manager,Overhead Cooling Systems In Data Centers Final Report To TheDATA CENTERS ..

  13. Hybrid sodium heat pipe receivers for dish/Stirling systems

    SciTech Connect (OSTI)

    Laing, D.; Reusch, M.

    1997-12-31

    The design of a hybrid solar/gas heat pipe receiver for the SBP 9 kW dish/Stirling system using a United Stirling AB V160 Stirling engine and the results of on-sun testing in alternative and parallel mode will be reported. The receiver is designed to transfer a thermal power of 35 kW. The heat pipe operates at around 800 C, working fluid is sodium. Operational options are solar-only, gas augmented and gas-only mode. Also the design of a second generation hybrid heat pipe receiver currently developed under a EU-funded project, based on the experience gained with the first hybrid receiver, will be reported. This receiver is designed for the improved SPB/L. and C.-10 kW dish/Stirling system with the reworked SOLO V161 Stirling engine.

  14. Cooling system for a bearing of a turbine rotor

    DOE Patents [OSTI]

    Schmidt, Mark Christopher (Niskayuna, NY)

    2002-01-01

    In a gas turbine, a bore tube assembly radially inwardly of an aft bearing conveys cooling steam to the buckets of the turbine and returns the cooling steam to a return. To cool the bearing and thermally insulate the bearing from the cooling steam paths, a radiation shield is spaced from the bore tube assembly by a dead air gap. Additionally, an air passageway is provided between the radiation shield and the inner surface of an aft shaft forming part of the rotor. Air is supplied from an inlet for flow along the passage and radially outwardly through bores in the aft shaft disk to cool the bearing and insulate it from transfer of heat from the cooling steam.

  15. Modeling and Dynamic Management of 3D Multicore Systems with Liquid Cooling

    E-Print Network [OSTI]

    Simunic, Tajana

    Modeling and Dynamic Management of 3D Multicore Systems with Liquid Cooling Ayse K. Coskun , Jos liquid cooling. Furthermore, for systems capable of varying the coolant flow rate at runtime, our University of Madrid, Spain. Embedded Systems Laboratory (ESL), Ecole Polytechnique F´ed´erale de Lausanne

  16. Dynamics of quantum-classical hybrid systems: Effect of matter-wave pressure

    SciTech Connect (OSTI)

    Shen, J. [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China); Huang, X. L. [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China); School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029 (China); Yi, X. X. [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China); Centre for Quantum Technologies and Department of Physics, National University of Singapore, Singapore 117543 (Singapore); Wu Chunfeng; Oh, C. H. [Centre for Quantum Technologies and Department of Physics, National University of Singapore, Singapore 117543 (Singapore)

    2010-12-15

    Radiation pressure affects the kinetics of a system exposed to radiation and it constitutes the basis of laser cooling. In this article, we study matter-wave pressure through examining the dynamics of a quantum-classical hybrid system. The quantum and classical subsystems are affected mutually via a changing boundary condition. Two systems, that is, an atom and a Bose-Einstein condensate (BEC), are considered as the quantum subsystems, while an oscillating wall is taken as the classical subsystem. We show that the classical subsystem would experience a force proportional to Q{sup -3} from the quantum atom, where Q denotes the distance between the two walls, whereas it acquires an additional force proportional to Q{sup -2} from the BEC due to the atom-atom interaction in the BEC. These forces can be understood as the matter-wave pressure.

  17. Improving Cooling performance of the mechanical resonator with the two-level-system defects

    E-Print Network [OSTI]

    Tian Chen; Xiang-Bin Wang

    2014-06-03

    We study cooling performance of a realistic mechanical resonator containing defects. The normal cooling method through an optomechanical system does not work efficiently due to those defects. We show by employing periodical $\\sigma_z$ pulses, we can eliminate the interaction between defects and their surrounded heat baths up to the first order of time. Compared with the cooling performance of no $\\sigma_z$ pulses case, much better cooling results are obtained. Moreover, this pulse sequence has an ability to improve the cooling performance of the resonator with different defects energy gaps and different defects damping rates.

  18. Federspiel Controls’ Data Center Energy Efficient Cooling Control System

    SciTech Connect (OSTI)

    2011-05-31

    Fact sheet about combining artificial intelligence with variable flow control, direct temperature measurement, and best practices that can reduce cooling energy use by up to 50%.

  19. Cool Roof Systems; What is the Condensation Risk?

    SciTech Connect (OSTI)

    Kehrer, Manfred [ORNL; Pallin, Simon B [ORNL

    2014-01-01

    A white roof, or cool roof, is constructed to decrease thermal loads from solar radiation, therefore saving energy by decreasing the cooling demands. Unfortunately, cool roofs with a mechanically attached membrane have shown a higher risk of intermediate condensation in the materials below the membrane in certain climates (Ennis & Kehrer, 2011) and in comparison with similar constructions with a darker exterior surface (Bludau, Zirkelbach, & Kuenzel, 2009). As a consequence, questions have been raised regarding the sustainability and reliability of using cool roof membranes in northern U.S. climate zones.

  20. Air-cooled Condensers in Next-generation Conversion Systems

    Office of Energy Efficiency and Renewable Energy (EERE)

    DOE Geothermal Program Peer Review 2010 - Presentation. Project objective: to reduce the costs associated with the generation of electrical power from air-cooled binary plants.

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

    DOE Patents [OSTI]

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

    2012-05-29

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

  2. DRAFT INTERIM REPORT: NATIONAL PROGRAM PLAN FOR PASSIVE AND HYBRID SOLAR HEATING AND COOLING

    E-Print Network [OSTI]

    Authors, Various

    2012-01-01

    build, finance, and market passive solar systems. Thepassive solar research, development, market field testing,passive solar research, development, market field testing,

  3. DRAFT INTERIM REPORT: NATIONAL PROGRAM PLAN FOR PASSIVE AND HYBRID SOLAR HEATING AND COOLING

    E-Print Network [OSTI]

    Authors, Various

    2012-01-01

    the immediate and potential applications of the solar energyutilities potential of passive finance solar system andthe potentials of dehumidifiers, heat pumps, and solar

  4. Approximate model checking of stochastic hybrid systems , J.-P. Katoen

    E-Print Network [OSTI]

    Abate, Alessandro

    -room heating system. 1 Introduction Stochastic hybrid systems are a broad and widely applicable classApproximate model checking of stochastic hybrid systems A. Abate , J.-P. Katoen , J. Lygeros , and M. Prandini§ Abstract A method for approximate model checking of stochastic hybrid systems

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

    SciTech Connect (OSTI)

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

    2000-06-19

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

  6. THERMAL STRESS CALCULATIONS FOR HEATPIPE-COOLED REACTOR POWER SYSTEMS.

    SciTech Connect (OSTI)

    Kapernick, R. J. (Richard J.); Guffee, R. M. (Ray M.)

    2001-01-01

    A heatpipe-cooled fast reactor concept has been under development at Los Alamos National Laboratory for the past several years, to be used as a power source for nuclear electric propulsion (NEP) or as a planetary surface power system. The reactor core consists of an array of modules that are held together by a core lateral restraint system. Each module comprises a single heatpipe surrounded by 3-6 clad fuel pins. As part of the design development and performance assessment activities for these reactors, specialized methods and models have been developed to perform thermal and stress analyses of the core modules. The methods have been automated so that trade studies can be readily performed, looking at design options such as module size, heatpipe and clad thickness, use of sleeves to contain the fuel, material type, etc. This paper describes the methods and models that have been developed, and presents thermal and stress analysis results for a Mars surface power system and a NEP power source.

  7. Fast cooling for a system of stochastic oscillators

    E-Print Network [OSTI]

    Yongxin Chen; Tryphon Georgiou; Michele Pavon

    2015-06-30

    We study feedback control of coupled nonlinear stochastic oscillators in a force field. We first consider the problem of asymptotically driving the system to a desired {\\em steady state} corresponding to reduced thermal noise. Among the feedback controls achieving the desired asymptotic transfer, we find that the most efficient one {from an energy point of view} is characterized by {\\em time-reversibility}. We also extend the theory of Schr\\"{o}dinger bridges to this model, thereby steering the system in {\\em finite time} and with minimum effort to a target steady-state distribution. The system can then be maintained in this state through the optimal steady-state feedback control. The solution, in the finite-horizon case, involves a space-time harmonic function $\\varphi$, and $-\\log\\varphi$ plays the role of an artificial, time-varying potential in which the desired evolution occurs. This framework appears extremely general and flexible and can be viewed as a considerable generalization of existing active control strategies such as macromolecular cooling. In the case of a quadratic potential, the results assume a form particularly attractive from the algorithmic viewpoint as the optimal control can be computed via deterministic matricial differential equations. An example involving inertial particles illustrates both transient and steady state optimal feedback control.

  8. Laser Inertial Fusion-based Energy: Neutronic Design Aspects of a Hybrid Fusion-Fission Nuclear Energy System

    E-Print Network [OSTI]

    Kramer, Kevin James

    2010-01-01

    of a Hybrid Fusion-Fission Nuclear Energy System by Kevinof a Hybrid Fusion-Fission Nuclear Energy System by Kevinof a Hybrid Fusion-Fission Nuclear Energy System by Kevin

  9. BRNS Workshop Verification of Digital and Hybrid Systems

    E-Print Network [OSTI]

    Shyamasundar, R.K.

    BRNS Workshop Verification of Digital and Hybrid Systems 7­11, January 1999, TIFR, Mumbai Advisory.K. Shyamasundar (TIFR, Chairman) K.C. Bhattacharjee (VSSC, Trivandrum) U. Chandra (BARC, Mumbai) V. Chandru (IISc., Bangalore) S.D. Dhodapkar (BARC, Mumbai) K. Karunakar (ADA, Bangalore) P.K. Pandya (TIFR, Mumbai) N. Raja

  10. Hybrid Fuel Cell / Gas Turbine Systems Auxiliary Power Unit

    E-Print Network [OSTI]

    Mease, Kenneth D.

    Hybrid Fuel Cell / Gas Turbine Systems Auxiliary Power Unit Abstract Recent interest in fuel cell fuel cell (SOFC) and fuel processor models have been developed and incorporated into the Numerical performance with experimental data is presented to demonstrate model validity. Introduction Fuel cell

  11. Borazine-boron nitride hybrid hydrogen storage system

    DOE Patents [OSTI]

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

    2008-04-22

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

  12. Ground state cooling of quantum systems via a one-shot measurement

    E-Print Network [OSTI]

    P. V. Pyshkin; Da-Wei Luo; J. Q. You; Lian-Ao Wu

    2015-03-13

    We prove that there exists a family of quantum systems that can be cooled to their ground states by a one-shot projective measurement on the ancillas coupled to these systems. Consequently, this proof gives rise to the conditions for achieving the one-shot measurement ground-state cooling (OSMGSC). We also propose a general procedure for finding unitary propagators and corresponding Hamiltonians to realize such cooling by means of inverse engineering technique.

  13. System and method for regulating EGR cooling using a rankine cycle

    DOE Patents [OSTI]

    Ernst, Timothy C.; Morris, Dave

    2015-12-22

    This disclosure relates to a waste heat recovery (WHR) system and method for regulating exhaust gas recirculation (EGR) cooling, and more particularly, to a Rankine cycle WHR system and method, including a recuperator bypass arrangement to regulate EGR exhaust gas cooling for engine efficiency improvement and thermal management. This disclosure describes other unique bypass arrangements for increased flexibility in the ability to regulate EGR exhaust gas cooling.

  14. Method and apparatus for controlling hybrid powertrain system in response to engine temperature

    DOE Patents [OSTI]

    Martini, Ryan D; Spohn, Brian L; Lehmen, Allen J; Cerbolles, Teresa L

    2014-10-07

    A method for controlling a hybrid powertrain system including an internal combustion engine includes controlling operation of the hybrid powertrain system in response to a preferred minimum coolant temperature trajectory for the internal combustion engine.

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

    SciTech Connect (OSTI)

    Kurt Montgomery; Nguyen Minh

    2003-08-01

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

  16. FULLY INTEGRATED ONE PHASE LIQUID COOLING SYSTEM FOR ORGANIC BOARDS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    cooling circuit consists of a cool plate for the power components, a heat exchanger to reject the heat and fabrication of micro-channels have been Power Components on µ-Channel - Structure Reservoir Heat Exchanger. It is highlighted that for such a concept a special type of membrane pump with adequate valve technology

  17. Interchange Format for Hybrid Systems: Abstract Semantics

    E-Print Network [OSTI]

    Carloni, Luca

    used by the algorithms. Modelica, for instance, pro- vides a language for describing systems in terms

  18. Air cooled turbine component having an internal filtration system

    DOE Patents [OSTI]

    Beeck, Alexander R. (Orlando, FL)

    2012-05-15

    A centrifugal particle separator is provided for removing particles such as microscopic dirt or dust particles from the compressed cooling air prior to reaching and cooling the turbine blades or turbine vanes of a turbine engine. The centrifugal particle separator structure has a substantially cylindrical body with an inlet arranged on a periphery of the substantially cylindrical body. Cooling air enters centrifugal particle separator through the separator inlet port having a linear velocity. When the cooling air impinges the substantially cylindrical body, the linear velocity is transformed into a rotational velocity, separating microscopic particles from the cooling air. Microscopic dust particles exit the centrifugal particle separator through a conical outlet and returned to a working medium.

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

    SciTech Connect (OSTI)

    Markel, T.; Simpson, A.

    2005-09-01

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

  20. Nuclear reactor cooling system decontamination reagent regeneration. [PWR; BWR

    DOE Patents [OSTI]

    Anstine, L.D.; James, D.B.; Melaika, E.A.; Peterson, J.P. Jr.

    1980-06-06

    An improved method for decontaminating the coolant system of water-cooled nuclear power reactors and for regenerating the decontamination solution is described. A small amount of one or more weak-acid organic complexing agents is added to the reactor coolant, and the pH is adjusted to form a decontamination solution which is circulated throughout the coolant system to dissolve metal oxides from the interior surfaces and complex the resulting metal ions and radionuclide ions. The coolant containing the complexed metal ions and radionuclide ions is passed through a strong-base anion exchange resin bed which has been presaturated with a solution containing the complexing agents in the same ratio and having the same pH as the decontamination solution. As the decontamination solution passes through the resin bed, metal-complexed anions are exchanged for the metal-ion-free anions on the bed, while metal-ion-free anions in the solution pass through the bed, thus removing the metal ions and regenerating the decontamination solution.

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

    SciTech Connect (OSTI)

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

    2004-09-30

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

  2. Nuclear Hybrid Energy Systems: Molten Salt Energy Storage

    SciTech Connect (OSTI)

    P. Sabharwall; M. Green; S.J. Yoon; S.M. Bragg-Sitton; C. Stoots

    2014-07-01

    With growing concerns in the production of reliable energy sources, the next generation in reliable power generation, hybrid energy systems, are being developed to stabilize these growing energy needs. The hybrid energy system incorporates multiple inputs and multiple outputs. The vitality and efficiency of these systems resides in the energy storage application. Energy storage is necessary for grid stabilizing and storing the overproduction of energy to meet peak demands of energy at the time of need. With high thermal energy production of the primary nuclear heat generation source, molten salt energy storage is an intriguing option because of its distinct properties. This paper will discuss the different energy storage options with the criteria for efficient energy storage set forth, and will primarily focus on different molten salt energy storage system options through a thermodynamic analysis

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

    DOE Patents [OSTI]

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

    2009-07-21

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

  4. Cooling laser system for quantum computing with barium-137 ions Tom Chartrand

    E-Print Network [OSTI]

    Blinov, Boris

    Cooling laser system for quantum computing with barium-137 ions Tom Chartrand Department of Physics of a powerful 493 nm laser source for cooling, by the resonant frequency doubling of a 986 nm external cavity diode lasers (ECDL), in a bowtie cavity with stabilization system. I. INTRODUCTION Trapped ions

  5. CFD Simulation and Analysis of the Combined Evaporative Cooling and Radiant Ceiling Air-conditioning System 

    E-Print Network [OSTI]

    Xiang, H.; Yinming, L.; Junmei, W.

    2006-01-01

    Due to such disadvantages as large air duct and high energy consumption of the current all- outdoor air evaporative cooling systems used in the dry region of Northwest China, as well as the superiority of the ceiling cooling system in improving...

  6. A Protocol For Cooling and Controlling Composite Systems by Local Interactions

    E-Print Network [OSTI]

    Daniel Burgarth; Vittorio Giovannetti

    2008-11-14

    We discuss an explicit protocol which allows one to externally cool and control a composite system by operating on a small subset of it. The scheme permits to transfer arbitrary and unknown quantum states from a memory on the network ("upload access") as well as the inverse ("download access"). In particular it yields a method for cooling the system.

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ENERGY MODELING OF A LEAD-ACID BATTERY WITHIN HYBRID WIND / PHOTOVOLTAIC SYSTEMS O. GERGAUD, G Abstract: Within the scope of full-scale energy modeling of a hybrid wind / photovoltaic system coupled-power hybrid wind/photovoltaic production system (20 ASE modules for a 2- kW polycrystalline silicon peak

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

    E-Print Network [OSTI]

    Boyer, Edmond

    A methodology for optimal sizing of autonomous hybrid PV/wind system S. Diaf 1* , D. Diaf2 , M paper presents a methodology to perform the optimal sizing of an autonomous hybrid PV/wind system system reliability requirements, with the lowest value of levelised cost of energy. Modelling a hybrid PV/wind

  9. Optimizing a Hybrid Energy Storage System for a Virtual Power Plant for Improved Wind Power

    E-Print Network [OSTI]

    Teodorescu, Remus

    Optimizing a Hybrid Energy Storage System for a Virtual Power Plant for Improved Wind Power approach to find two optimum energy storages (ESs) to build a hybrid system which is part of a virtual power plant. In this paper it means the combination of the hybrid energy storage system and wind power

  10. Abstraction and CounterexampleGuided Refinement in Model Checking of Hybrid Systems

    E-Print Network [OSTI]

    : Formal Verification, Abstraction, Model Checking, Hybrid Systems, Refinement, Counterexamples #12; 1Abstraction and Counterexample­Guided Refinement in Model Checking of Hybrid Systems Edmund Clarke a counterexample generated by the model checker. For hybrid systems, analysis of the counterexample requires

  11. HYBRID GROUND SOURCE HEAT PUMP SYSTEM SIMULATION USING VISUAL MODELING TOOL FOR HVACSIM+

    E-Print Network [OSTI]

    HYBRID GROUND SOURCE HEAT PUMP SYSTEM SIMULATION USING VISUAL MODELING TOOL FOR HVACSIM+ M.H. Khan, 74078, USA ABSTRACT This paper presents a simulation of a hybrid ground source heat pump system, performed using a new graphical user interface for HVACSIM+. Hybrid ground source heat pump systems

  12. Formal modeling and analysis of hybrid systems: A case study in multi-robot coordination

    E-Print Network [OSTI]

    the design phase. The formal analysis of the mixed digital-analog nature of hybrid systems r, and robots. Designing reliable hybrid systems is a challenging task. Control theoretic tools enable. A game-theoretic approach to designing controllers for hybrid systems with a hierarchical structure

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

    E-Print Network [OSTI]

    conditioning (HVAC), and process heat. The system can be modularly configured for hybrid concentrating PVA 20-SUN HYBRID PV-THERMAL LINEAR MICRO-CONCENTRATOR SYSTEM FOR URBAN ROOFTOP APPLICATIONS D Walter of America ABSTRACT A unique, linear, low-concentration, hybrid `micro- concentrator' (MCT) system concept

  14. APPROXIMATE SIMULATION RELATIONS FOR HYBRID SYSTEMS 1

    E-Print Network [OSTI]

    Pappas, George J.

    . Pappas Department of Electrical and Systems Engineering University of Pennsylvania Philadelphia, PA been introduced as a powerful tool for the approximation of discrete and continuous systems systems approximation. An example of application in the context of safety verification is shown. Keywords

  15. INCREMENTAL COOLING LOAD DETERMINATION FOR PASSIVE DIRECT GAIN HEATING SYSTEMS

    E-Print Network [OSTI]

    Sullivan, Paul W.

    2013-01-01

    an increment of 1 ft to a passive building in each of the 25Passive and Hybrid Division, of the Office of Solar Applica- tions for Buildings,building thermal dynamics including features of particular interest, such as passive

  16. Optimization of hybrid-water/air-cooled condenser in an enhanced turbine

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History ViewMayo, Maryland:NPI VenturesNewSt.InformationImprovements Oil andOpowergeothermal ORC system

  17. Electromagnetially-induced-transparency-like ground-state cooling in a double-cavity optomechanical system

    E-Print Network [OSTI]

    Yujie Guo; Kai Li; Wenjie Nie; Yong Li

    2014-07-19

    We propose to cool a mechanical resonator close to its ground state via an electromagnetically-induced-transparency- (EIT-) like cooling mechanism in a double-cavity optomechanical system, where an additional cavity couples to the original one in the standard optomechanical system. By choosing optimal parameters such that the cooling process of the mechanical resonator corresponds to the maximum value of the optical fluctuation spectrum and the heating process to the minimum one, the mechanical resonator can be cooled with the final mean phonon number less than that at the absence of the additional cavity. And we show the mechanical resonator may be cooled close to its ground state via such an EIT-like cooling mechanism even when the original resolved sideband condition is not fulfilled at the absence of the additional cavity.

  18. Monitoring system for a liquid-cooled nuclear fission reactor

    DOE Patents [OSTI]

    DeVolpi, Alexander (Bolingbrook, IL)

    1987-01-01

    A monitoring system for detecting changes in the liquid levels in various regions of a water-cooled nuclear power reactor, viz., in the downcomer, in the core, in the inlet and outlet plenums, at the head, and elsewhere; and also for detecting changes in the density of the liquid in these regions. A plurality of gamma radiation detectors are used, arranged vertically along the outside of the reactor vessel, and collimator means for each detector limits the gamma-radiation it receives as emitting from only isolated regions of the vessel. Excess neutrons produced by the fission reaction will be captured by the water coolant, by the steel reactor walls, or by the fuel or control structures in the vessel. Neutron capture by steel generates gamma radiation having an energy level of the order of 5-12 MeV, whereas neutron capture by water provides an energy level of approximately 2.2 MeV, and neutron capture by the fission fuel or its cladding provides an energy level of 1 MeV or less. The intensity of neutron capture thus changes significantly at any water-metal interface. Comparative analysis of adjacent gamma detectors senses changes from the normal condition with liquid coolant present to advise of changes in the presence and/or density of the coolant at these specific regions. The gamma detectors can also sense fission-product gas accumulation at the reactor head to advise of a failure of fuel-pin cladding.

  19. 26 ASHRAE Transactions: Research Cooling-dominated commercial and institutional build-

    E-Print Network [OSTI]

    design of hybrid ground- source heat pump systems. INTRODUCTION Ground-source heat pump (GSHP) systems of Hybrid Ground-Source Heat Pump Systems That Use a Cooling Pond as a Supplemental Heat Rejecter-- A System- ings served by ground-source heat pump (GSHP) systems generally reject more heat to a closed ground

  20. 26 ASHRAE Transactions: Research Cooling-dominated commercial and institutional build-

    E-Print Network [OSTI]

    - ings served by ground-source heat pump (GSHP) systems generally reject more heat to a closed ground design of hybrid ground- source heat pump systems. INTRODUCTION Ground-source heat pump (GSHP) systems of Hybrid Ground-Source Heat Pump Systems That Use a Cooling Pond as a Supplemental Heat Rejecter-- A System

  1. Ground state cooling is not possible given initial system-thermal bath factorization

    E-Print Network [OSTI]

    Lian-Ao Wu; Dvira Segal; Paul Brumer

    2012-10-16

    In this paper we prove that a fundamental constraint on the cooling dynamic implies that it is impossible to cool, via a unitary system-bath quantum evolution, a system that is embedded in a thermal environment down to its ground state, if the initial state is a factorized product of system and bath states. The latter is a crucial but artificial assumption often included in many descriptions of system-bath dynamics. The analogous conclusion holds for 'cooling' to any pure state of the system.

  2. NASA Marshall Space Flight Center Improves Cooling System Performance: Best Management Practice Case Study #10: Cooling Towers (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2011-02-01

    National Aeronautics and Space Administration's (NASA) Marshall Space Flight Center (MSFC) has a longstanding sustainability program that revolves around energy and water efficiency as well as environmental protection. MSFC identified a problematic cooling loop with six separate compressor heat exchangers and a history of poor efficiency. The facility engineering team at MSFC partnered with Flozone Services, Incorporated to implement a comprehensive water treatment platform to improve the overall efficiency of the system.

  3. System identification and optimal control for mixed-mode cooling

    E-Print Network [OSTI]

    Spindler, Henry C. (Henry Carlton), 1970-

    2004-01-01

    The majority of commercial buildings today are designed to be mechanically cooled. To make the task of air conditioning buildings simpler, and in some cases more energy efficient, windows are sealed shut, eliminating ...

  4. Cooling season study and economic analysis of a desiccant cooling system 

    E-Print Network [OSTI]

    Lee, James Howard

    1992-01-01

    10 20 30 40 50 60 70 80 Gas Cost (3/GJ) Figure 4. 4 Gas Price vs DINC Cycle Payback Period at Various Electricity Prices SEER = 12 35 20 18 16 ~ 14 ~ 12 D o 10 8 6 o 4 $0. 06/Kwh $0. 09/Kwh $0. 12/Kwh $0. 15/Kwh $0. 'I 8/Kwh 10 20... IV ECONOMIC ANALYSIS V CONCLUSIONS 28 36 NOMENCLATURE 39 REFERENCES 46 APPENDIX A - HOUSE CONSTRUCTION DATA . . APPENDIX B - SECOND LAW COMPARISON 48 53 APPENDIX C - COOLING SEASON AND DINC CYCLE PROGRAM LISTING 72 APPENDIX D - ECONOMIC...

  5. Solar Energy to Drive Absorption Cooling Systems Suitable for Small Building Applications 

    E-Print Network [OSTI]

    Gomri, R.

    2010-01-01

    Air conditioning systems have a major impact on energy demand. With fossil fuels fast depleting, it is imperative to look for cooling systems that require less high-grade energy for their operation. In this context, ...

  6. Hydraulic modeling of large district cooling systems for master planning purposes 

    E-Print Network [OSTI]

    Xu, Chen

    2007-09-17

    District Cooling Systems (DCS) have been widely applied in large institutions such as universities, government facilities, commercial districts, airports, etc. The hydraulic system of a large DCS can be complicated. They ...

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

    E-Print Network [OSTI]

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

  8. Experimental Study of the Floor Radiant Cooling System Combined with Displacement Ventilation 

    E-Print Network [OSTI]

    Ren, Y.; Li, D.; Zhang, Y.

    2006-01-01

    As a comfortable and energy-efficient air conditioning system, the application of floor radiant heating system is used increasingly greatly in the north of China. As a result, the feasibility of floor radiant cooling has gained more attention...

  9. Robust execution for stochastic hybrid systems

    E-Print Network [OSTI]

    Blackmore, Lars James Christopher

    2007-01-01

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

  10. Multiobjective Search for the Management of a Hybrid Energy Storage System

    E-Print Network [OSTI]

    Noé, Reinhold

    Multiobjective Search for the Management of a Hybrid Energy Storage System Simon Boxnick, Stefan Kl objective search algorithm. The algorithm is designed for the management of a hybrid energy storage module-board hybrid energy storage system (HES) of the novel autonomous rail-bound vehicle RailCab developed

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

    E-Print Network [OSTI]

    Greenhut, Andrew David

    2010-01-01

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

  12. Experiences from the Roadrunner petascale hybrid systems

    SciTech Connect (OSTI)

    Kerbyson, Darren J; Pakin, Scott; Lang, Mike; Sancho Pitarch, Jose C; Davis, Kei; Barker, Kevin J; Peraza, Josh

    2010-01-01

    The combination of flexible microprocessors (AMD Opterons) with high-performing accelerators (IBM PowerXCell 8i) resulted in the extremely powerful Roadrunner system. Many challenges in both hardware and software were overcome to achieve its goals. In this talk we detail some of the experiences in achieving performance on the Roadrunner system. In particular we examine several implementations of the kernel application, Sweep3D, using a work-queue approach, a more portable Thread-building-blocks approach, and an MPI on the accelerator approach.

  13. Optimization of a hybrid solar energy collector system 

    E-Print Network [OSTI]

    Shinkman, Alan M.

    1981-01-01

    OPTIMIZATION OF A HYBRID SOLAR ENERGY COLLECTOR SYSTEM A Thesis by ALAN M. SHI NEMAN Submitted to the Graduate College of Texas A&N University in partial fulfillment of the requirement for the degree MASTER OF SCIENCE May 1981 Major Subject...: (Chairman of Committee) (Member) (Member) (Me et) (Head o Department) May 1981 wmezg ABSTRACT The Structural Impact of Commodity Farm Programs on Farms in the Southern Texas High Plains. (May 1981) Christina Ray Shirley, B. S. , Illinois State...

  14. Blockade of Rabi oscillations in hybrid optomechanical systems

    E-Print Network [OSTI]

    Timo Holz; Ralf Betzholz; Marc Bienert

    2015-07-01

    In a hybrid optomechanical setup consisting of a two-level atom in a cavity with a pendular end-mirror, the interplay between the light field's radiation pressure on the mirror and the dipole interaction with the atom can lead to a blockade effect, which manifests itself in a suppression of Rabi oscillations in the atomic population. This effect is present when the system is in the single photon strong coupling regime and has an analogy in the photon blockade of optomechanics.

  15. Effect of a Radiant Panel Cooling System on Indoor Air Quality of a Conditioned Space 

    E-Print Network [OSTI]

    Mohamed, E.; Abdalla, K. N.

    2010-01-01

    This paper discusses the effect of a radiant cooling panel system on an indoor air quality (IAQ) of a conditioned space. In this study, ceiling radiant cooling panel, mechanical ventilation with fan coil unit (FCU) and 100% fresh air are used...

  16. Solar heating and cooling of residential buildings: sizing, installation and operation of systems. 1980 edition

    SciTech Connect (OSTI)

    1980-09-01

    This manual was prepared as a text for a training course on solar heating and cooling of residential buildings. The course and text are directed toward sizing, installation, operation, and maintenance of solar systems for space heating and hot water supply, and solar cooling is treated only briefly. (MHR)

  17. System and method of active vibration control for an electro-mechanically cooled device

    DOE Patents [OSTI]

    Lavietes, Anthony D. (Hayward, CA); Mauger, Joseph (Livermore, CA); Anderson, Eric H. (Mountain View, CA)

    2000-01-01

    A system and method of active vibration control of an electro-mechanically cooled device is disclosed. A cryogenic cooling system is located within an environment. The cooling system is characterized by a vibration transfer function, which requires vibration transfer function coefficients. A vibration controller generates the vibration transfer function coefficients in response to various triggering events. The environments may differ by mounting apparatus, by proximity to vibration generating devices, or by temperature. The triggering event may be powering on the cooling system, reaching an operating temperature, or a reset action. A counterbalance responds to a drive signal generated by the vibration controller, based on the vibration signal and the vibration transfer function, which adjusts vibrations. The method first places a cryogenic cooling system within a first environment and then generates a first set of vibration transfer function coefficients, for a vibration transfer function of the cooling system. Next, the cryogenic cooling system is placed within a second environment and a second set of vibration transfer function coefficients are generated. Then, a counterbalance is driven, based on the vibration transfer function, to reduce vibrations received by a vibration sensitive element.

  18. Evaluation of the 2007 Toyota Camry Hybrid Synergy Drive System

    SciTech Connect (OSTI)

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

    2008-04-15

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

  19. SMR Handbook: Hybrid Energy Systems Involving SMRs

    SciTech Connect (OSTI)

    Shannon M. Bragg-Sitton

    2014-09-01

    Large-scale nuclear reactors are traditionally operated for a singular purpose: steady-state production of dispatchable baseload electricity that is distributed broadly on the electric grid. While this implementation is key to a sustainable, reliable energy grid, SMRs offer new opportunities for increased use of clean nuclear energy for both electric and thermal applications in more locations – while still accommodating the desire to support renewable production sources. This chapter considers a scenario in which renewable generation would be tightly coupled with the nuclear generation source – behind the grid – to meet the grid demand as an integrated energy system while simultaneously producing other commodities with the available thermal energy.

  20. Survey and evaluation of available thermal insulation materials for use on solar heating and cooling systems

    SciTech Connect (OSTI)

    Not Available

    1980-03-01

    This is the final report of a survey and evaluation of insulation materials for use with components of solar heating and cooling systems. The survey was performed by mailing questionnaires to manufacturers of insulation materials and by conducting an extensive literature search to obtain data on relevant properties of various types of insulation materials. The study evaluated insulation materials for active and passive solar heating and cooling systems and for multifunction applications. Primary and secondary considerations for selecting insulation materials for various components of solar heating and cooling systems are presented.

  1. Ice Thermal Storage Systems for LWR Supplemental Cooling and Peak Power Shifting

    SciTech Connect (OSTI)

    Haihua Zhao; Hongbin Zhang; Phil Sharpe; Blaise Hamanaka; Wei Yan; WoonSeong Jeong

    2010-06-01

    Availability of enough cooling water has been one of the major issues for the nuclear power plant site selection. Cooling water issues have frequently disrupted the normal operation at some nuclear power plants during heat waves and long draught. The issues become more severe due to the new round of nuclear power expansion and global warming. During hot summer days, cooling water leaving a power plant may become too hot to threaten aquatic life so that environmental regulations may force the plant to reduce power output or even temporarily to be shutdown. For new nuclear power plants to be built at areas without enough cooling water, dry cooling can be used to remove waste heat directly into the atmosphere. However, dry cooling will result in much lower thermal efficiency when the weather is hot. One potential solution for the above mentioned issues is to use ice thermal storage systems (ITS) that reduce cooling water requirements and boost the plant’s thermal efficiency in hot hours. ITS uses cheap off-peak electricity to make ice and uses those ice for supplemental cooling during peak demand time. ITS is suitable for supplemental cooling storage due to its very high energy storage density. ITS also provides a way to shift large amount of electricity from off peak time to peak time. Some gas turbine plants already use ITS to increase thermal efficiency during peak hours in summer. ITSs have also been widely used for building cooling to save energy cost. Among three cooling methods for LWR applications: once-through, wet cooling tower, and dry cooling tower, once-through cooling plants near a large water body like an ocean or a large lake and wet cooling plants can maintain the designed turbine backpressure (or condensation temperature) during 99% of the time; therefore, adding ITS to those plants will not generate large benefits. For once-through cooling plants near a limited water body like a river or a small lake, adding ITS can bring significant economic benefits and avoid forced derating and shutdown during extremely hot weather. For the new plants using dry cooling towers, adding the ice thermal storage systems can effectively reduce the efficiency loss and water consumption during hot weather so that new LWRs could be considered in regions without enough cooling water. \\ This paper presents the feasibility study of using ice thermal storage systems for LWR supplemental cooling and peak power shifting. LWR cooling issues and ITS application status will be reviewed. Two ITS application case studies will be presented and compared with alternative options: one for once-through cooling without enough cooling for short time, and the other with dry cooling. Because capital cost, especially the ice storage structure/building cost, is the major cost for ITS, two different cost estimation models are developed: one based on scaling method, and the other based on a preliminary design using Building Information Modeling (BIM), an emerging technology in Architecture/Engineering/Construction, which enables design options, performance analysis and cost estimating in the early design stage.

  2. Hybrid Electric Systems: Goals, Strategies, and Top Accomplishments (Brochure)

    SciTech Connect (OSTI)

    Not Available

    2010-06-01

    Fact sheet describes the work EERE is doing in the areas of hybrid, plug-in hybrid, and all-electric vehicles.

  3. Hybrid Plasma Reactor/Filter for Transportable Collective Protection Systems

    SciTech Connect (OSTI)

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

    2011-04-06

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

  4. Mechanically Cooled Large-Volume Germanium Detector Systems for Neclear Explosion Monitoring DOENA27323-2

    SciTech Connect (OSTI)

    Hull, E.L.

    2006-10-30

    Compact maintenance free mechanical cooling systems are being developed to operate large volume high-resolution gamma-ray detectors for field applications. To accomplish this we are utilizing a newly available generation of Stirling-cycle mechanical coolers to operate the very largest volume germanium detectors with no maintenance. The user will be able to leave these systems unplugged on the shelf until needed. The maintenance-free operating lifetime of these detector systems will exceed 5 years. Three important factors affect the operation of mechanically cooled germanium detectors: temperature, vacuum, and vibration. These factors will be studied in the laboratory at the most fundamental levels to insure a solid understanding of the physical limitations each factor places on a practical mechanically cooled germanium detector system. Using this knowledge, mechanically cooled germanium detector prototype systems will be designed and fabricated.

  5. Numerical Simulations of Boiling Jet Impingement Cooling in Power Electronics

    SciTech Connect (OSTI)

    Narumanchi, S.; Troshko, A.; Hassani, V.; Bharathan, D.

    2006-12-01

    This paper explores turbulent boiling jet impingement for cooling power electronic components in hybrid electric vehicles.

  6. Ice Thermal Storage Systems for Nuclear Power Plant Supplemental Cooling and Peak Power Shifting

    SciTech Connect (OSTI)

    Haihua Zhao; Hongbin Zhang; Phil Sharpe; Blaise Hamanaka; Wei Yan; WoonSeong Jeong

    2013-03-01

    Availability of cooling water has been one of the major issues for the nuclear power plant site selection. Cooling water issues have frequently disrupted the normal operation at some nuclear power plants during heat waves and long draught. One potential solution is to use ice thermal storage (ITS) systems that reduce cooling water requirements and boost the plant’s thermal efficiency in hot hours. ITS uses cheap off-peak electricity to make ice and uses the ice for supplemental cooling during peak demand time. ITS also provides a way to shift a large amount of electricity from off peak time to peak time. For once-through cooling plants near a limited water body, adding ITS can bring significant economic benefits and avoid forced derating and shutdown during extremely hot weather. For the new plants using dry cooling towers, adding the ITS systems can effectively reduce the efficiency loss during hot weather so that new plants could be considered in regions lack of cooling water. This paper will review light water reactor cooling issues and present the feasibility study results.

  7. Simulation of radiant cooling performance with evaporative cooling sources

    E-Print Network [OSTI]

    Moore, Timothy

    2008-01-01

    2000. “Closed Circuit Cooling Tower Selection Program”S R. Lay, 2003 “Radiant Cooling Systems – A Solution forH. 1994. “Hydronic Radiant Cooling Systems. ” Center for

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

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

  9. A computer simulation appraisal of non-residential low energy cooling systems in California

    SciTech Connect (OSTI)

    Bourassa, Norman; Haves, Philip; Huang, Joe

    2002-05-17

    An appraisal of the potential performance of different Low Energy Cooling (LEC) systems in nonresidential buildings in California is being conducted using computer simulation. The paper presents results from the first phase of the study, which addressed the systems that can be modeled, with the DOE-2.1E simulation program. The following LEC technologies were simulated as variants of a conventional variable-air-volume system with vapor compression cooling and mixing ventilation in the occupied spaces: Air-side indirect and indirect/direct evaporative pre-cooling. Cool beams. Displacement ventilation. Results are presented for four populous climates, represented by Oakland, Sacramento, Pasadena and San Diego. The greatest energy savings are obtained from a combination of displacement ventilation and air-side indirect/direct evaporative pre-cooling. Cool beam systems have the lowest peak demand but do not reduce energy consumption significantly because the reduction in fan energy is offse t by a reduction in air-side free cooling. Overall, the results indicate significant opportunities for LEC technologies to reduce energy consumption and demand in nonresidential new construction and retrofit.

  10. Modeling the transient operation of an endothermic fuel cooling system for high Mach number vehicle missions 

    E-Print Network [OSTI]

    Williams, Mark Robert

    1993-01-01

    A computer model was developed to simulate the transient operation of a hypothetical endothermic fuel cooling system. The model simulated the performance of a cross-flow, shell and tube heat exchanger. This model was applied to a representative...

  11. Technical and Economic Analysis of Solar Cooling Systems in a Hot and Humid Climate 

    E-Print Network [OSTI]

    Moaveni, H.

    2010-01-01

    The aim of this paper is to promote efficient and cost effective implementation of advanced solar cooling systems and techniques for the hot and humid climates cities in the United States. After an introduction of basic ...

  12. Energy Efficiency Evaluation of Refrigeration Technologies in Combined Cooling, Heating and Power Systems 

    E-Print Network [OSTI]

    Zuo, Z.; Hu, W.

    2006-01-01

    With development of absorption refrigeration technology, the cooling requirement can be met using various optional refrigeration technologies in a CCHP system, including compression refrigeration, steam double-effect absorption refrigeration, steam...

  13. Novel Controls for Economic Dispatch of Combined Cooling, Heating and Power (CCHP) Systems

    Broader source: Energy.gov [DOE]

    The emergence of technologies that efficiently convert heat into cooling, such as absorption chillers, has opened up many new opportunities and markets for combined heat and power systems. These...

  14. Indoor Humidity Analysis of an Integrated Radiant Cooling and Desiccant Ventilation System 

    E-Print Network [OSTI]

    Gong, X.; Claridge, D. E.

    2006-01-01

    latent heat, they normally are used in conjunction with an independent ventilation system, which is capable of decoupling the space sensible and latent loads. Condensation concerns limit the application of radiant cooling. This paper studies...

  15. The Operation Management and Energy Consumption Analysis of the District Cooling System 

    E-Print Network [OSTI]

    Xu, Q.; Li, D.; Xu, W.

    2006-01-01

    Based on the investigation of the district cooling system of the Zhongguancun Square in Beijing, we thoroughly analyzed the process of its operation management and the main factors that affect energy consumption. The basis was provided...

  16. MIT Electric Vehicle Team Porsche designing a cooling system for the AC24 electric motor

    E-Print Network [OSTI]

    Meenen, Jordan N

    2010-01-01

    In this thesis I worked on the design and analysis of a cooling system for the electric motor of the MIT Electric Vehicle Team's Porsche 914 Battery Electric Vehicle. The vehicle's Azure Dynamics AC24 motor tended to ...

  17. Questions About Your Cooling Water System That You Need To Ask 

    E-Print Network [OSTI]

    Matson, J. V.

    1984-01-01

    Many operators of cooling water systems do not have sufficient comprehension to be able to formulate the questions they should be asking their vendors and suppliers. The objective of this paper is to not only ask the most important questions...

  18. Study on The Intelligence Control System of Artificial Cooling Source in Architecture 

    E-Print Network [OSTI]

    Yang, Z.; Xu, X.

    2006-01-01

    To overcome the shortcoming of constant temperature and humidity in artificial cooling source control system, a dynamic indoor temperature control strategy was put forward under health and thermal comfortable principles. With a lump human model...

  19. Retro-Commissioning and Improvement for District Heating and Cooling System Using Simulation 

    E-Print Network [OSTI]

    Shingu, H.; Nakajima, R.; Yoshida, H.; Wang, F.

    2006-01-01

    In order to improve the energy performance of a district heating and cooling (DHC) system, retro-commissioning was analyzed using visualization method and simulation based on mathematical models, and improved operation schemes were proposed...

  20. Conservation of Energy Through The Use of a Predictive Performance Simulator of Operating Cooling Water Systems 

    E-Print Network [OSTI]

    Schell, C. J.

    1981-01-01

    Conservation of energy is an important consideration in the operation of cooling water systems. Conserving energy by operating at the most effective cycles of concentration and by keeping heat exchangers clean is contingent upon having the optimum...

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

    E-Print Network [OSTI]

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

    2007-01-01

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

  2. Performance Evaluation for Modular, Scalable Overhead Cooling Systems In Data Centers

    SciTech Connect (OSTI)

    Xu, TengFang T.

    2009-05-01

    Scientific and enterprise data centers, IT equipment product development, and research data center laboratories typically require continuous cooling to control inlet air temperatures within recommended operating levels for the IT equipment. The consolidation and higher density aggregation of slim computing, storage and networking hardware has resulted in higher power density than what the raised-floor system design, coupled with commonly used computer rack air conditioning (CRAC) units, was originally conceived to handle. Many existing data centers and newly constructed data centers adopt CRAC units, which inherently handle heat transfer within data centers via air as the heat transfer media. This results in energy performance of the ventilation and cooling systems being less than optimal. Understanding the current trends toward higher power density in IT computing, more and more IT equipment manufacturers are designing their equipment to operate in 'conventional' data center environments, while considering provisions of alternative cooling solutions to either their equipment or supplemental cooling in rack or row systems. Naturally, the trend toward higher power density resulting from current and future generations of servers has, in the meanwhile, created significant opportunities for precision cooling suppliers to engineer and manufacture packaged modular and scalable systems. The modular and scalable cooling systems aim at significantly improving efficiency while addressing the thermal challenges, improving reliability, and allowing for future needs and growth. Such pre-engineered and manufactured systems may be a significant improvement over current design; however, without an energy efficiency focus, their applications could also lead to even lower energy efficiencies in the overall data center infrastructure. The overall goal of the project supported by California Energy Commission was to characterize four commercially available, modular cooling systems installed in a data center. Such modular cooling systems are all scalable localized units, and will be evaluated in terms of their operating energy efficiency in a real data center, respectively, as compared to the energy efficiency of traditional legacy data center cooling systems. The technical objective of this project was to evaluate the energy performance of one of the four commercially available modular cooling systems installed in a data center in Sun Microsystems, Inc. This report is the result of a test plan that was developed with the industrial participants' input, including specific design and operating characteristics of the selected modular localized cooling solution provided by vendor 1. The technical evaluation included monitoring and measurement of selected parameters, and establishing and calculating energy efficiency metrics for the selected cooling product, which is a modular, scalable overhead cooling system. The system was tested in a hot/cold aisle environment without separation, or containment or the hot or cold aisles. The scope of this report is to quantify energy performance of the modular cooling unit in operation as it corresponds to a combination of varied server loads and inlet air temperatures. The information generated from this testing when combined with a concurrent research study to document the energy efficiency of the host data center's central chilled water cooling plant can be used to estimate potential energy savings from implementing modular cooling compared to conventional cooling in data centers.

  3. Solar heating and cooling system installed at RKL Controls Company, Lumberton, New Jersey. Final report

    SciTech Connect (OSTI)

    1981-03-01

    Solar heating and cooling of a 40,000 square foot manufacturing building, sales offices and the solar computer control center/display room are described. Information on system description, test data, major problems and resolutions, performance, operation and maintenance manual, manufacturer's literature and as-built drawings are provided also. The solar system is composed of 6000 square feet of Sunworks double glazed flat plate collectors, external above ground storage subsystem, controls, ARKLA absorption chiller, heat recovery and a cooling tower.

  4. Performance Evaluation for a Modular, Scalable Passive Cooling System in Data Centers

    SciTech Connect (OSTI)

    Xu, TengFang

    2009-05-01

    Scientific and enterprise data centers, IT equipment product development, and research data center laboratories typically require continuous cooling to control inlet air temperatures within recommended operating levels for the IT equipment. The consolidation and higher density aggregation of slim computing, storage and networking hardware has resulted in higher power density than what the raised-floor system design, coupled with commonly used computer rack air conditioning (CRAC) units, was originally conceived to handle. Many existing data centers and newly constructed data centers adopt CRAC units, which inherently handle heat transfer within data centers via air as the heat transfer media. This results in energy performance of the ventilation and cooling systems being less than optimal. Understanding the current trends toward higher power density in IT computing, more and more IT equipment manufacturers are designing their equipment to operate in 'conventional' data center environments, while considering provisions of alternative cooling solutions to either their equipment or supplemental cooling in rack or row systems. In the meanwhile, the trend toward higher power density resulting from current and future generations of servers has created significant opportunities for precision cooling to engineer and manufacture packaged modular and scalable systems. The modular and scalable cooling systems aim at significantly improving efficiency while addressing the thermal challenges, improving reliability, and allowing for future needs and growth. Such pre-engineered and manufactured systems may be a significant improvement over current design; however, without an energy efficiency focus, their applications could also lead to even lower energy efficiencies in the overall data center infrastructure. The overall goal of the project supported by California Energy Commission was to characterize four commercially available, modular cooling systems installed in a data center. Such modular cooling systems are all scalable localized units, and will be evaluated in terms of their operating energy efficiency in a real data center, respectively, as compared to the energy efficiency of traditional legacy data center cooling systems. The technical objective of this project was to evaluate the energy performance of one of the four commercially available modular cooling systems installed in a data center in Sun Microsystems, Inc. This report is the result of a test plan that was developed with the industrial participants input, including specific design and operating characteristics of the selected passive, modular localized cooling solution provided by vendor 4. The technical evaluation included monitoring and measurement of selected parameters, and establishing and calculating energy efficiency metrics for the selected cooling product, which is a passive, modular, scalable liquid cooling system in this study. The scope is to quantify energy performance of the modular cooling unit corresponding to various server loads and inlet air temperatures, under various chilled-water supply temperatures. The information generated from this testing when combined with documented energy efficiency of the host data center's central chilled water cooling plant can be used to estimate potential energy savings from implementing modular cooling compared to conventional cooling in data centers.

  5. Performance Evaluation for Modular, Scalable Liquid-Rack Cooling Systems in Data Centers

    SciTech Connect (OSTI)

    Xu, TengFang

    2009-05-01

    Scientific and enterprise data centers, IT equipment product development, and research data center laboratories typically require continuous cooling to control inlet air temperatures within recommended operating levels for the IT equipment. The consolidation and higher density aggregation of slim computing, storage and networking hardware has resulted in higher power density than what the raised-floor system design, coupled with commonly used computer rack air conditioning (CRAC) units, was originally conceived to handle. Many existing data centers and newly constructed data centers adopt CRAC units, which inherently handle heat transfer within data centers via air as the heat transfer media. This results in energy performance of the ventilation and cooling systems being less than optimal. Understanding the current trends toward higher power density in IT computing, more and more IT equipment manufacturers are designing their equipment to operate in 'conventional' data center environments, while considering provisions of alternative cooling solutions to either their equipment or supplemental cooling in rack or row systems. In the meanwhile, the trend toward higher power density resulting from current and future generations of servers has created significant opportunities for precision cooling suppliers to engineer and manufacture packaged modular and scalable systems. The modular and scalable cooling systems aim at significantly improving efficiency while addressing the thermal challenges, improving reliability, and allowing for future needs and growth. Such pre-engineered and manufactured systems may be a significant improvement over current design; however, without an energy efficiency focus, their applications could also lead to even lower energy efficiencies in the overall data center infrastructure. The overall goal of the project supported by California Energy Commission was to characterize four commercially available, modular cooling systems installed in a data center. Such modular cooling systems are all scalable localized units, and will be evaluated in terms of their operating energy efficiency in a real data center, respectively, as compared to the energy efficiency of traditional legacy data center cooling systems. The technical objective of this project was to evaluate the energy performance of one of the four commercially available modular cooling systems installed in a data center in Sun Microsystems, Inc. This report is the result of a test plan that was developed with the industrial participants input, including specific design and operating characteristics of the selected modular localized cooling solution provided by vendor 3. The technical evaluation included monitoring and measurement of selected parameters, and establishing and calculating energy efficiency metrics for the selected cooling product, which is a modular, scalable liquid-rack cooling system in this study. The scope is to quantify energy performance of the modular cooling unit in operation as it corresponds to a combination of varied server loads and inlet air temperatures, under various chilled-water supply temperatures. The information generated from this testing when combined with documented energy efficiency of the host data center's central chilled water cooling plant can be used to estimate potential energy savings from implementing modular cooling compared to conventional cooling in data centers.

  6. Performance Evaluation for Modular, Scalable Cooling Systems with Hot Aisle Containment in Data Centers

    SciTech Connect (OSTI)

    Adams, Barbara J

    2009-05-01

    Scientific and enterprise data centers, IT equipment product development, and research data center laboratories typically require continuous cooling to control inlet air temperatures within recommended operating levels for the IT equipment. The consolidation and higher density aggregation of slim computing, storage and networking hardware has resulted in higher power density than what the raised-floor system design, coupled with commonly used computer rack air conditioning (CRAC) units, was originally conceived to handle. Many existing data centers and newly constructed data centers adopt CRAC units, which inherently handle heat transfer within data centers via air as the heat transfer media. This results in energy performance of the ventilation and cooling systems being less than optimal. Understanding the current trends toward higher power density in IT computing, more and more IT equipment manufacturers are designing their equipment to operate in 'conventional' data center environments, while considering provisions of alternative cooling solutions to either their equipment or supplemental cooling in rack or row systems. Naturally, the trend toward higher power density resulting from current and future generations of servers has, in the meanwhile, created significant opportunities for precision cooling suppliers to engineer and manufacture packaged modular and scalable systems. The modular and scalable cooling systems aim at significantly improving efficiency while addressing the thermal challenges, improving reliability, and allowing for future needs and growth. Such pre-engineered and manufactured systems may be a significant improvement over current design; however, without an energy efficiency focus, their applications could also lead to even lower energy efficiencies in the overall data center infrastructure. The overall goal of the project supported by California Energy Commission was to characterize four commercially available, modular cooling systems installed in a data center. Such modular cooling systems are all scalable localized units, and will be evaluated in terms of their operating energy efficiency in a real data center, respectively, as compared to the energy efficiency of traditional legacy data center cooling systems. The technical objective of this project was to evaluate the energy performance of one of the four commercially available modular cooling systems installed in a data center in Sun Microsystems, Inc. This report is the result of a test plan that was developed with the industrial participants input, including specific design and operating characteristics of the selected modular localized cooling solution provided by vendor 2. The technical evaluation included monitoring and measurement of selected parameters, and establishing and calculating energy efficiency metrics for the selected cooling product, which is a modular, scalable pair of chilled water cooling modules that were tested in a hot/cold aisle environment with hot aisle containment. The scope of this report is to quantify energy performance of the modular cooling unit in operation as it corresponds to a combination of varied server loads and inlet air temperatures. The information generated from this testing when combined with a concurrent research study to document the energy efficiency of the host data center's central chilled water cooling plant can be used to estimate potential energy savings from implementing modular cooling compared to conventional cooling in data centers.

  7. Indirect hydrogen versus helium or nitrogen cooling for fusion cryogenic and magnet systems Clarke R.H1

    E-Print Network [OSTI]

    Glowacki, Bartek A.

    347 Indirect hydrogen versus helium or nitrogen cooling for fusion cryogenic and magnet systems in fusion cryogenic and magnet systems may be possible through the use of 15-20 K cooling. This approach there is no substitute. By using an intermediate, leak-tight, pressurised helium loop the benefits of 15-20 K cooling can

  8. Method and system for simulating heat and mass transfer in cooling towers

    DOE Patents [OSTI]

    Bharathan, Desikan (Lakewood, CO); Hassani, A. Vahab (Golden, CO)

    1997-01-01

    The present invention is a system and method for simulating the performance of a cooling tower. More precisely, the simulator of the present invention predicts values related to the heat and mass transfer from a liquid (e.g., water) to a gas (e.g., air) when provided with input data related to a cooling tower design. In particular, the simulator accepts input data regarding: (a) cooling tower site environmental characteristics; (b) cooling tower operational characteristics; and (c) geometric characteristics of the packing used to increase the surface area within the cooling tower upon which the heat and mass transfer interactions occur. In providing such performance predictions, the simulator performs computations related to the physics of heat and mass transfer within the packing. Thus, instead of relying solely on trial and error wherein various packing geometries are tested during construction of the cooling tower, the packing geometries for a proposed cooling tower can be simulated for use in selecting a desired packing geometry for the cooling tower.

  9. A Mathematical Model for a Lithium-Ion Battery/Electrochemical Capacitor Hybrid System

    E-Print Network [OSTI]

    Popov, Branko N.

    A Mathematical Model for a Lithium-Ion Battery/Electrochemical Capacitor Hybrid System Godfrey those of high-energy battery systems such as lithium ion. Al- though advanced battery systems and double the performance of a battery/electrochemical capacitor-hybrid system has been developed. Simulation results

  10. Postdoc position: Hybrid Systems Theorem Proving Carnegie Mellon University, Computer Science Department

    E-Print Network [OSTI]

    Sandholm, Tuomas W.

    Postdoc position: Hybrid Systems Theorem Proving Carnegie Mellon University, Computer Science is to develop next-generation verification techniques for cyber- physical systems and hybrid systems. Our prover KeYmaera and have found application in the verification of cars, aircraft, railway systems

  11. A High Capacity Hybrid Fiberoptic/Wireless Communication System: An Overview W. D. Jemison1

    E-Print Network [OSTI]

    Herczfeld, Peter

    A High Capacity Hybrid Fiberoptic/Wireless Communication System: An Overview by W. D. Jemison1 , P This paper describes the development of a hybrid fiberoptic/wireless communications system. The system picocell. The system can support high-capacity (Gb/s) secure mobile communications for both military

  12. Time-Based Storage Bandwidth Allocation in Hybrid Storage Systems Rice University

    E-Print Network [OSTI]

    Time-Based Storage Bandwidth Allocation in Hybrid Storage Systems Hui Wang Rice University Peter for a hybrid storage system made up of both HDs and SSDs. To continue the example, suppose the HD has slicing treats the storage system as a black box and dedicates the system to a client for its time slice

  13. Performance Evaluation of Radiant Cooling System Integrated with Air System under Different Operational Strategies

    SciTech Connect (OSTI)

    Khare, Vaibhav [Malaviya National Institute of Technology (MNIT), Jaipur, India; Khan, Yasin [Malaviya National Institute of Technology (MNIT), Jaipur, India; Mathur, Jyotirmay [Malaviya National Institute of Technology (MNIT), Jaipur, India; Bhandari, Mahabir S [ORNL

    2015-01-01

    The paper describes a parametric study developed to estimate the energy savings potential of a radiant cooling system installed in a commercial building in India. The study is based on numerical modeling of a radiant cooling system installed in an Information Technology (IT) office building sited in the composite climate of Hyderabad. To evaluate thermal performance and energy consumption, simulations were carried out using the ANSYS FLUENT and EnergyPlus softwares, respectively. The building model was calibrated using the measured data for the installed radiant system. Then this calibrated model was used to simulate the energy consumption of a building using a conventional all-air system to determine the proportional energy savings. For proper handling of the latent load, a dedicated outside air system (DOAS) was used as an alternative to Fan Coil Unit (FCU). A comparison of energy consumption calculated that the radiant system was 17.5 % more efficient than a conventional all-air system and that a 30% savings was achieved by using a DOAS system compared with a conventional system. Computational Fluid Dynamics (CFD) simulation was performed to evaluate indoor air quality and thermal comfort. It was found that a radiant system offers more uniform temperatures, as well as a better mean air temperature range, than a conventional system. To further enhance the energy savings in the radiant system, different operational strategies were analyzed based on thermal analysis using EnergyPlus. The energy savings achieved in this parametric run were more than 10% compared with a conventional all-air system.

  14. Dynamics in hybrid complex systems of switches and oscillators

    E-Print Network [OSTI]

    Dane Taylor; Elana J. Fertig; Juan G. Restrepo

    2013-08-09

    While considerable progress has been made in the analysis of large systems containing a single type of coupled dynamical component (e.g., coupled oscillators or coupled switches), systems containing diverse components (e.g., both oscillators and switches) have received much less attention. We analyze large, hybrid systems of interconnected Kuramoto oscillators and Hopfield switches with positive feedback. In this system, oscillator synchronization promotes switches to turn on. In turn, when switches turn on they enhance the synchrony of the oscillators to which they are coupled. Depending on the choice of parameters, we find theoretically coexisting stable solutions with either (i) incoherent oscillators and all switches permanently off, (ii) synchronized oscillators and all switches permanently on, or (iii) synchronized oscillators and switches that periodically alternate between the on and off states. Numerical experiments confirm these predictions. We discuss how transitions between these steady state solutions can be onset deterministically through dynamic bifurcations or spontaneously due to finite-size fluctuations.

  15. Adaptive hybrid optimal quantum control for imprecisely characterized systems

    E-Print Network [OSTI]

    D. J. Egger; F. K. Wilhelm

    2014-06-24

    Optimal quantum control theory carries a huge promise for quantum technology. Its experimental application, however, is often hindered by imprecise knowledge of the its input variables, the quantum system's parameters. We show how to overcome this by Adaptive Hybrid Optimal Control (Ad-HOC). This protocol combines open- and closed-loop optimal by first performing a gradient search towards a near-optimal control pulse and then an experimental fidelity measure with a gradient-free method. For typical settings in solid-state quantum information processing, Ad-Hoc enhances gate fidelities by an order of magnitude hence making optimal control theory applicable and useful.

  16. Control system and method for a hybrid electric vehicle

    DOE Patents [OSTI]

    Tamor, Michael Alan (Toledo, OH)

    2001-03-06

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

  17. 2012 Annual Merit Review Results Report - Hybrid Vehicle Systems Technologies

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:Financing ToolInternationalReport FY2014Conferenceof Energy Los2 1. Hybrid and Vehicle Systems

  18. Propellant feed system of a regeneratively cooled scramjet

    SciTech Connect (OSTI)

    Kanda, Takeshi; Masuya, Goro; Wakamatsu, Yoshio )

    1991-04-01

    An expander cycle for an airframe-integrated hydrogen-fueled scramjet is analyzed to study regenerative cooling characteristics and overall specific impulse. Below Mach 10, the specific impulse and thrust coincide with the reference values. At Mach numbers above 10, a reduction of the specific impulse occurs due to the coolant flow rate requirement, which is accompanied by an increase of thrust. It is shown that the thrust may be increased by injecting excess fuel into the combustor to compensate for the decrease of the specific impulse. 9 refs.

  19. Increase Energy Efficiency by Analyzing Cooling Water Systems 

    E-Print Network [OSTI]

    Phelps, P.

    2015-01-01

    ) causes hydraulic imbalance as they foul and the ?p’s fluctuate 9 ESL-IE-15-06-37 Proceedings of the Thrity-Seventh Industrial Energy Technology Conference New Orleans, LA. June 2-4, 2015 Case Study: Vacuum Tower vs. Overhead and Jet Condensers Cooling... water is critical to the efficient operation of the vacuum tower and overall energy efficiency of the refinery. 10 ESL-IE-15-06-37 Proceedings of the Thrity-Seventh Industrial Energy Technology Conference New Orleans, LA. June 2-4, 2015 11 Typical...

  20. Evaluation of a Direct Evaporative Roof-Spray Cooling System 

    E-Print Network [OSTI]

    Carrasco, A.; Pittard, R.; Kondepudi, S. N.; Somasundaram, S.

    1987-01-01

    of Evaporative Cooling of Roofs", Project Report, I (1986). JULY 29 * EXP-Wcr + EXP-DRY --- MOO-WET -- MOD-DRY TIME OF DAY IN DECIMAL HOURS Figure 3. Heat Flux Through the Roof - July 29 TIME OF DAY IN DECIMAL HOURS 150- v, W W 140- CC Z: P 130... gunny bags on the temperatures and heat flux at the ceiling surface of thick roofs. They concluded that, in the tropics, for the effect of reduced indoor temper- atures to be more effective, the roofs needed to be treated. They further confirmed...

  1. Asymmetric crystallization during cooling and heating in model glass-forming systems

    E-Print Network [OSTI]

    Minglei Wang; Kai Zhang; Zhusong Li; Yanhui Liu; Jan Schroers; Mark D. Shattuck; Corey S. O'Hern

    2015-01-09

    We perform molecular dynamics (MD) simulations of the crystallization process in binary Lennard-Jones systems during heating and cooling to investigate atomic-scale crystallization kinetics in glass-forming materials. For the cooling protocol, we prepared equilibrated liquids above the liquidus temperature $T_l$ and cooled each sample to zero temperature at rate $R_c$. For the heating protocol, we first cooled equilibrated liquids to zero temperature at rate $R_p$ and then heated the samples to temperature $T > T_l$ at rate $R_h$. We measured the critical heating and cooling rates $R_h^*$ and $R_c^*$, below which the systems begin to form a substantial fraction of crystalline clusters during the heating and cooling protocols. We show that $R_h^* > R_c^*$, and that the asymmetry ratio $R_h^*/R_c^*$ includes an intrinsic contribution that increases with the glass-forming ability (GFA) of the system and a preparation-rate dependent contribution that increases strongly as $R_p \\rightarrow R_c^*$ from above. We also show that the predictions from classical nucleation theory (CNT) can qualitatively describe the dependence of the asymmetry ratio on the GFA and preparation rate $R_p$ from the MD simulations and results for the asymmetry ratio measured in Zr- and Au-based bulk metallic glasses (BMG). This work emphasizes the need for and benefits of an improved understanding of crystallization processes in BMGs and other glass-forming systems.

  2. Constructing Invariants for Hybrid Systems Sriram Sankaranarayanan, Henny B. Sipma, and Zohar Manna

    E-Print Network [OSTI]

    Sankaranarayanan, Sriram

    Constructing Invariants for Hybrid Systems Sriram Sankaranarayanan, Henny B. Sipma, and Zohar Manna Computer Science Department Stanford University Stanford, CA 94305-9045 {srirams

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

    SciTech Connect (OSTI)

    Markel, T.; Simpson, A.

    2006-05-01

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

  4. Can Future Emissions Limits be Met with a Hybrid EGR System Alone...

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

    of hybrid EGR system in terms of deliverable EGR-rate, airfuel ratio, pumping losses and fuel use, taking into account interaction between EGR and boosting technology. Control...

  5. An Optimization Framework for Dynamic Hybrid Energy Systems

    SciTech Connect (OSTI)

    Wenbo Du; Humberto E Garcia; Christiaan J.J. Paredis

    2014-03-01

    A computational framework for the efficient analysis and optimization of dynamic hybrid energy systems (HES) is developed. A microgrid system with multiple inputs and multiple outputs (MIMO) is modeled using the Modelica language in the Dymola environment. The optimization loop is implemented in MATLAB, with the FMI Toolbox serving as the interface between the computational platforms. Two characteristic optimization problems are selected to demonstrate the methodology and gain insight into the system performance. The first is an unconstrained optimization problem that optimizes the dynamic properties of the battery, reactor and generator to minimize variability in the HES. The second problem takes operating and capital costs into consideration by imposing linear and nonlinear constraints on the design variables. The preliminary optimization results obtained in this study provide an essential step towards the development of a comprehensive framework for designing HES.

  6. Design Considerations for Economically Competitive Sodium Cooled Fast Reactors

    SciTech Connect (OSTI)

    Hongbin Zhang; Haihua Zhao

    2009-05-01

    The technological viability of sodium cooled fast reactors (SFR) has been established by various experimental and prototype (demonstration) reactors such as EBR-II, FFTF, Phénix, JOYO, BN-600 etc. However, the economic competitiveness of SFR has not been proven yet. The perceived high cost premium of SFRs over LWRs has been the primary impediment to the commercial expansion of SFR technologies. In this paper, cost reduction options are discussed for advanced SFR designs. These include a hybrid loop-pool design to optimize the primary system, multiple reheat and intercooling helium Brayton cycle for the power conversion system and the potential for suppression of intermediate heat transport system. The design options for the fully passive decay heat removal systems are also thoroughly examined. These include direct reactor auxiliary cooling system (DRACS), reactor vessel auxiliary cooling system (RVACS) and the newly proposed pool reactor auxiliary cooling system (PRACS) in the context of the hybrid loop-pool design.

  7. Preliminary Analysis of a Solar Heat Pump System with Seasonal Storage for Heating and Cooling 

    E-Print Network [OSTI]

    Yu, G.; Chen, P.; Dalenback, J.

    2006-01-01

    For higher solar fraction and suitability for both heating and cooling, a solar heat pump system with seasonal storage was studied in this paper. The system scheme and control strategy of a solar heat pump system with seasonal storage for heating...

  8. Cooling of laser diode arrays in planar optical systems C. Gimkiewicz, J. Jahns

    E-Print Network [OSTI]

    Jahns, Jürgen

    Cooling of laser diode arrays in planar optical systems C. Gimkiewicz, J. Jahns Planar optics has optical system consists of a transparent substrate with integrated microoptical components into a planar optical system. But these diode arrays are responsible for a heat dissipation in the order

  9. Computational Issues in Intelligent Control: Discrete-Event and Hybrid Systems

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    Computational Issues in Intelligent Control: Discrete-Event and Hybrid Systems Xenofon D discrete event and hybrid systems. Computational issues of various problems and al- gorithms concerning to address the control needs of complex systems that exhibit complicated dynamical behaviors. The design

  10. Verification of Hybrid Systems Based on Counterexample-Guided Abstraction Refinement

    E-Print Network [OSTI]

    Clarke, Edmund M.

    verification, abstraction transforms the inherently infinite state system into a finite-state model [7Verification of Hybrid Systems Based on Counterexample-Guided Abstraction Refinement Edmund Clarke1 generated by the model checker. For hybrid systems, analysis of the counterexample requires the computation

  11. Verification of Hybrid Systems Based on CounterexampleGuided Abstraction Refinement ?

    E-Print Network [OSTI]

    Theobald, Michael

    verification, abstraction transforms the inherently infinite state system into a finite­state model [7, 8Verification of Hybrid Systems Based on Counterexample­Guided Abstraction Refinement ? Edmund that eliminates a counterexample generated by the model checker. For hybrid systems, analy­ sis

  12. Multi-Layer Prefetching for Hybrid Storage Systems: Algorithms, Models, and Evaluations

    E-Print Network [OSTI]

    Qin, Xiao

    Multi-Layer Prefetching for Hybrid Storage Systems: Algorithms, Models, and Evaluations Mais Nijim1, Atlanta, GA, USA. Abstract: Parallel storage systems have been highly scalable and widely used in support, hybrid storage systems opt for a solution to fulfill a variety of demands such as large storage capacity

  13. Synthesizing Controllers for Hybrid Systems ? Deepak Kapur 1 and R.K. Shyamasundar 2

    E-Print Network [OSTI]

    Kapur, Deepak

    plant, a digital­analog guidance of transport systems, control of a robot, flexible manufacturing systems, etc., can benefit from the study of hybrid models. Design, analysis (verification) and synthesisSynthesizing Controllers for Hybrid Systems ? Deepak Kapur 1 and R.K. Shyamasundar 2 1 Department

  14. A Feasibility Study for Wind/Hybrid Power System Applications for New England Islands

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    A Feasibility Study for Wind/Hybrid Power System Applications for New England Islands Gabriel systems that presently provide electricity and heating to the islands also vary. Of particular note wind/hybrid systems. A feasibility study, carried out at the Renewable Energy Research Laboratory (RERL

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

    E-Print Network [OSTI]

    Pedram, Massoud

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

  16. Aalborg Universitet Performance of hybrid quad generation system consisting of solid oxide fuel cell

    E-Print Network [OSTI]

    Liso, Vincenzo

    ., & Liso, V. (2013). Performance of hybrid quad generation system consisting of solid oxide fuel cell oxide fuel cell system and absorption heat pump Irene Albacete Cachorroa ,Iulia Maria DarabanaAalborg Universitet Performance of hybrid quad generation system consisting of solid oxide fuel

  17. Cost-Effective Design of a Hybrid Electrical Energy Storage System for Electric Vehicles

    E-Print Network [OSTI]

    Pedram, Massoud

    Cost-Effective Design of a Hybrid Electrical Energy Storage System for Electric Vehicles Di Zhu1 to the successful application of hybrid electrical energy storage (HEES) systems in electric vehi- cles (EVs energy storage system comprised of Li-ion batteries only. 1. INTRODUCTION Electric vehicles (EVs) have

  18. Control Valve Trajectories for SOFC Hybrid System Startup

    SciTech Connect (OSTI)

    Gorrell, Megan; Banta, Larry; Rosen, William; Restrepo, Bernardo; Tucker, David

    2012-07-01

    Control and management of cathode airflow in a solid oxide fuel cell gas turbine hybrid power system was analyzed using the Hybrid Performance (HyPer) hardware simulation at the National Energy Technology (NETL), U.S. Department of Energy. This work delves into previously unexplored operating practices for HyPer, via simultaneous manipulation of bypass valves and the electric load on the generator. The work is preparatory to the development of a Multi-Input, Multi-Output (MIMO) controller for HyPer. A factorial design of experiments was conducted to acquire data for 81 different combinations of the manipulated variables, which consisted of three air flow control valves and the electric load on the turbine generator. From this data the response surface for the cathode airflow with respect to bypass valve positions was analyzed. Of particular interest is the control of airflow through the cathode during system startup and during large load swings. This paper presents an algorithm for controlling air mass flow through the cathode based on a modification of the steepest ascent method.

  19. Mechanically Cooled Large-Volume Germanium Detector Systems for Nuclear Explosion Monitoring

    SciTech Connect (OSTI)

    Hull, Ethan L.; Pehl, Richard H.; Lathrop, James R.; Martin, Gregory N.; Mashburn, R. B.; Miley, Harry S.; Aalseth, Craig E.; Hossbach, Todd W.; Bowyer, Ted W.

    2006-09-21

    Compact maintenance free mechanical cooling systems are being developed to operate large volume (~570 cm3, ~3 kg, 140% or larger) germanium detectors for field applications. We are using a new generation of Stirling-cycle mechanical coolers for operating the very largest volume germanium detectors with absolutely no maintenance or liquid nitrogen requirements. The user will be able to leave these systems unplugged on the shelf until needed. The flip of a switch will bring a system to life in ~1 hour for measurements. The maintenance-free operating lifetime of these detector systems will exceed five years. These features are necessary for remote long-duration liquid-nitrogen free deployment of large-volume germanium gamma-ray detector systems for Nuclear Explosion Monitoring (NEM). The Radionuclide Aerosol Sampler/Analyzer (RASA) will greatly benefit from the availability of such detectors by eliminating the need for liquid nitrogen at RASA sites while still allowing the very largest available germanium detectors to be utilized. These mechanically cooled germanium detector systems being developed here will provide the largest, most sensitive detectors possible for use with the RASA. To provide such systems, the appropriate technical fundamentals are being researched. Mechanical cooling of germanium detectors has historically been a difficult endeavor. The success or failure of mechanically cooled germanium detectors stems from three main technical issues: temperature, vacuum, and vibration. These factors affect one another. There is a particularly crucial relationship between vacuum and temperature. These factors will be experimentally studied both separately and together to insure a solid understanding of the physical limitations each factor places on a practical mechanically cooled germanium detector system for field use. Using this knowledge, a series of mechanically cooled germanium detector prototype systems are being designed and fabricated. Our collaborators at Pacific Northwest National Laboratory (PNNL) will evaluate these detector systems on the bench top and eventually in RASA systems to insure reliable and practical operation.

  20. Linear-optical simulation of the cooling of a cluster-state Hamiltonian system

    E-Print Network [OSTI]

    G. H. Aguilar; T. Kolb; D. Cavalcanti; L. Aolita; R. Chaves; S. P. Walborn; P. H. Souto Ribeiro

    2014-03-26

    A measurement-based quantum computer could consist of a local-gapped Hamiltonian system, whose thermal states --at sufficiently low temperature-- are universal resources for the computation. Initialization of the computer would correspond to cooling the system. We perform an experimental quantum simulation of such cooling process with entangled photons. We prepare three-qubit thermal cluster states exploiting the equivalence between local dephasing and thermalisation for these states. This allows us to tune the system's temperature by changing the dephasing strength. We monitor the entanglement as the system cools down and observe the transitions from separability to bound entanglement, and then to free entanglement. We also analyze the performance of the system for measurement-based single-qubit state preparation. These studies constitute a basic characterisation of experimental cluster-state computation under imperfect conditions.

  1. Hybrid computer simulation of atomic orbitals of one electron system 

    E-Print Network [OSTI]

    Balasubramanium, Prabaker

    1998-01-01

    quantum chemical wave equation. Generating this function is the unit level operation in molecular modeling. Therefore, analyzing the performance of the hybrid computer at this level will bring out the basic differences between hybrid computing and digital...

  2. Evaluation of 2005 Honda Accord Hybrid Electric Drive System

    SciTech Connect (OSTI)

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

    2006-09-11

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

  3. Daniel Liberzon and A. Stephen Morse y a switched system, we mean a hybrid dynamical system

    E-Print Network [OSTI]

    Morse, A. Stephen

    . This article surveys recent developments in three basic problems regarding stability and design of switched industry, aircraft and air traffic control, switching power converters, and many other fields. The book 18C s Daniel Liberzon and A. Stephen Morse y a switched system, we mean a hybrid dynamical system

  4. System Simulations of Hybrid Electric Vehicles with Focus on Emissions

    Broader source: Energy.gov [DOE]

    Comparative simulations of hybrid electric vehicles with gasoline and diesel engines will be conducted with focus on emissions control.

  5. Structural Oil Pan With Integrated Oil Filtration And Cooling System

    DOE Patents [OSTI]

    Freese, V, Charles Edwin (Westland, MI)

    2000-05-09

    An oil pan for an internal combustion engine includes a body defining a reservoir for collecting engine coolant. The reservoir has a bottom and side walls extending upwardly from the bottom to present a flanged lip through which the oil pan may be mounted to the engine. An oil cooler assembly is housed within the body of the oil pan for cooling lubricant received from the engine. The body includes an oil inlet passage formed integrally therewith for receiving lubricant from the engine and delivering lubricant to the oil cooler. In addition, the body also includes an oil pick up passage formed integrally therewith for providing fluid communication between the reservoir and the engine through the flanged lip.

  6. Evaluation of systems and components for hybrid optical firing sets

    SciTech Connect (OSTI)

    Landry, M.J.; Rupert, J.W.; Mittas, A.

    1989-06-01

    High-energy density light appears to be a unique energy form that may be used to enhance the nuclear safety of weapon systems. Hybrid optical firing sets (HOFS) utilize the weak-link/strong-link exclusion region concept for nuclear safety; this method is similar to present systems, but uses light to transmit power across the exclusion region barrier. This report describes the assembling, operating, and testing of fourteen HOFS. These firing sets were required to charge a capacitor-discharge unit to 2.0 and 2.5 kV (100 mJ) in less than 1 s. First, we describe the components, the measurement techniques used to evaluate the components, and the different characteristics of the measured components. Second, we describe the HOFS studied, the setups used for evaluating them, and the resulting characteristics. Third, we make recommendations for improving the overall performance and suggest the best HOFS for packaging. 36 refs., 145 figs., 14 tabs.

  7. Demonstration of a Variable Phase Turbine Power System for Low...

    Energy Savers [EERE]

    & Publications track 1: Low Temp | geothermal 2015 peer review track 3: enhanced geothermal systems (EGS) | geothermal 2015 peer review Optimization of hybrid-waterair-cooled...

  8. Design and Construction of the NSTX Bakeout, Cooling and Vacuum Systems

    SciTech Connect (OSTI)

    L.E. Dudek; M. Kalish; R. Gernhardt; R.F. Parsells; W. Blanchard

    1999-11-01

    This paper will describe the design, construction and initial operation of the NSTX bakeout, water cooling and vacuum systems. The bakeout system is designed for two modes of operation. The first mode allows heating of the first wall components to 350 degrees C while the external vessel is cooled to 150 degrees C. The second mode cools the first wall to 150 degrees C and the external vessel to 50 degrees C. The system uses a low viscosity heat transfer oil which is capable of high temperature low pressure operation. The NSTX Torus Vacuum Pumping System (TVPS) is designed to achieve a base pressure of approximately 1x10 (superscript -8) Torr and to evacuate the plasma fuel gas loads in less than 5 minutes between discharges. The vacuum pumping system is capable of a pumping speed of approximately 3400 l/s for deuterium. The hardware consists of two turbo molecular pumps (TMPs) and a mechanical pump set consisting of a mechanical and a Roots blower pump. A PLC is used as the control system to provide remote monitoring, control and software interlock capability. The NSTX cooling water provides chilled, de ionized water for heat removal in the TF, OH and PF, power supplies, bus bar systems, and various diagnostics. The system provides flow monitoring via a PLC to prevent damage due to loss of flow.

  9. Heat Transfer Performance and Piping Strategy Study for Chilled Water Systems at Low Cooling Loads 

    E-Print Network [OSTI]

    Li, Nanxi 1986-

    2012-12-05

    studied in this thesis is the chilled water system at the Dallas/Fort Worth International Airport (DFW Airport). This system has the problem of low delta-T under low cooling loads. When the chilled water flow is much lower than the design conditions at low...

  10. WICKING OPTIMIZATION FOR THERMAL COOLING -WITH A TITANIUM BASED HEAT PIPE SYSTEM

    E-Print Network [OSTI]

    MacDonald, Noel C.

    WICKING OPTIMIZATION FOR THERMAL COOLING -WITH A TITANIUM BASED HEAT PIPE SYSTEM C. Ding1* , P for a proposed flat heat pipe system. This unique bitextured titania structure (BTS) provides a suprerhydrophilic based flat heat pipe is proposed to integrate the BTS wicks and study the concept of this titanium based

  11. Safe Intersections: At the Crossing of Hybrid Systems and Verification Sarah M. Loos and Andre Platzer

    E-Print Network [OSTI]

    Platzer, André

    scenarios may be distributed hybrid systems [21] when there is a multi-agent situation with mul- tiple carsSafe Intersections: At the Crossing of Hybrid Systems and Verification Sarah M. Loos and Andr and risks in ground trans- portation, e.g., by making cars aware of their environment and regulating speed

  12. Electrically heated particulate filter regeneration methods and systems for hybrid vehicles

    DOE Patents [OSTI]

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

    2010-10-12

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

  13. Models for Multi-Specie Chemical Reactions Using Polynomial Stochastic Hybrid Systems

    E-Print Network [OSTI]

    Hespanha, João Pedro

    Models for Multi-Specie Chemical Reactions Using Polynomial Stochastic Hybrid Systems Abhyudai for chemical reactions is presented. This is done by representing the population of various species involved in a chemical reaction as the continuous state of a polynomial Stochastic Hybrid System (pSHS). An important

  14. Improving the Yeast Three-Hybrid System for High-Throughput Target Discovery

    E-Print Network [OSTI]

    Bailey, Kyle

    2011-05-27

    -protein interactions. The yeast three-hybrid system is an attractive alternative that uses genetic tools to screen for protein-small molecule interactions in cellulo. This thesis describes efforts to improve the utility of the yeast three-hybrid system to screen...

  15. Fault tree construction of hybrid system requirements using qualitative formal method

    E-Print Network [OSTI]

    specifying requirements for software controlling hybrid systems and conducting safety analysis, engineersFault tree construction of hybrid system requirements using qualitative formal method Jang-Soo Leea , Sung-Deok Chab,* a Instrumentation and Control, Human Factors Division, Korea Atomic Energy Research

  16. On Control-Lyapunov Functions for Hybrid Time-Varying Systems Michael Malisoff and Frederic Mazenc

    E-Print Network [OSTI]

    Sontag, Eduardo

    On Control-Lyapunov Functions for Hybrid Time-Varying Systems Michael Malisoff and Fr´ed´eric Mazenc Abstract-- We explicitly construct strict input-to-state stable Lyapunov functions for time varying hybrid systems, in terms of given nonstrict Lyapunov functions and persistency of excitation

  17. Optimal Energy Management for a Hybrid Energy Storage System Combining Batteries and Double

    E-Print Network [OSTI]

    Noé, Reinhold

    Optimal Energy Management for a Hybrid Energy Storage System Combining Batteries and Double Layer storage for operation. High demands concerning power and energy density, small volume and weight is to combine storage technologies with complementary characteristics as a hybrid energy storage system. Thus

  18. Online Capable Optimized Planning of Power Split in a Hybrid Energy Storage System

    E-Print Network [OSTI]

    Noé, Reinhold

    Online Capable Optimized Planning of Power Split in a Hybrid Energy Storage System Karl Stephan, D-33095 Paderborn (Germany) {stille,romaus,boecker}@lea.upb.de Abstract--A hybrid energy storage system is an energy storage consisting of more than one type of energy storages combining

  19. A scalable and flexible hybrid energy storage system design and implementation

    E-Print Network [OSTI]

    Pedram, Massoud

    A scalable and flexible hybrid energy storage system design and implementation Younghyun Kim and flexibility. Detailed description on implementation of hybrid energy storage system prototype. Power conversion efficiency and energy storage element characteristics considered. a r t i c l e i n f o Article

  20. Short communication Optimization of hybrid ground coupled and air source heat pump systems

    E-Print Network [OSTI]

    Fernández de Córdoba, Pedro

    Short communication Optimization of hybrid ­ ground coupled and air source ­ heat pump systems 2008 Accepted 14 January 2010 Available online 28 January 2010 Keywords: Ground coupled heat pump Air to water heat pump Thermal storage device Hybrid HVAC system Energy efficiency Numerical simulation a b

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

    E-Print Network [OSTI]

    Foss, Bjarne A.

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

  2. $500,000 annually for heating and cooling prior to the installation of the PureComfortTM cooling, heating, and power system. Electrical power and space conditioning are now

    E-Print Network [OSTI]

    Pennycook, Steve

    -fired boilers and a steam heating system, and supplements the remaining campus heating and cooling system$500,000 annually for heating and cooling prior to the installation of the PureComfortTM cooling, heating, and power system. Electrical power and space conditioning are now provided more efficiently

  3. The Cooling System for BteV Pixels

    E-Print Network [OSTI]

    Cinabro, David

    , by Cryomech, Inc. It consists of Cryomech's model AL10 Cryogenic Refridgerator and a CP510 Compressor System

  4. Control system and method for a hybrid electric vehicle

    DOE Patents [OSTI]

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

    2001-01-01

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

  5. Supervisory Control of Hybrid Systems XENOFON D. KOUTSOUKOS, PANOS J. ANTSAKLIS, FELLOW, IEEE, JAMES A. STIVER, AND

    E-Print Network [OSTI]

    Antsaklis, Panos

    Supervisory Control of Hybrid Systems XENOFON D. KOUTSOUKOS, PANOS J. ANTSAKLIS, FELLOW, IEEE control of hybrid systems is in- troduced and discussed at length. Such control systems typically arise, in transportation sys- tems, and in communication networks. A functional architecture of hybrid control systems

  6. A novel hybrid (wind-photovoltaic) system sizing procedure

    SciTech Connect (OSTI)

    Hocaoglu, Fatih O.; Gerek, Oemer N.; Kurban, Mehmet

    2009-11-15

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

  7. Design and Construction of the NSTX Bakeout, Cooling and Vacuum Systems L. E. Dudek, W. Blanchard, M. Kalish, R. Gernhardt and R. F. Parsells

    E-Print Network [OSTI]

    Design and Construction of the NSTX Bakeout, Cooling and Vacuum Systems L. E. Dudek, W. Blanchard operation of the NSTX bakeout, water cooling and vacuum systems. The bakeout system is designed for two the external vessel is cooled to 150 °C. The second mode cools the first wall to 150 °C and the external vessel

  8. Discussion on the Energy-Saving Potential of a Hybrid System in a Large Space Building in Different Areas 

    E-Print Network [OSTI]

    Liu, S.; Huang, C.

    2006-01-01

    The use of a hybrid ventilation system is promoted to decrease the annual energy consumption of air conditioning. The switch-point of temperature, which is related with weather conditions, is presented to control the hybrid system properly...

  9. Rehabilitation of Secondary Heating and Cooling Systems - Case Study 

    E-Print Network [OSTI]

    Chen, H.; Deng, S.; Hugghins, J.; Brundidge, T.; Claridge, D.; Turner, W. D.; Bruner, H., Jr.

    2002-01-01

    differential pressure and to operate outside of the valves? operation limitations on modulation, erosion, cavitations, wear, and close-off pressure. The valve would assuredly have a shortened life if it were installed in a system where the available... will occur unless system adjustments are made (Hegberg Mark C. 2000). In extreme cases, damage caused by erosion, cavitations, and a process akin to wire drawing can occur. In a simple system, the actuator might simply stop functioning properly...

  10. Hybrid-drive implosion system for ICF targets

    DOE Patents [OSTI]

    Mark, James W. (Danville, CA)

    1988-01-01

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

  11. Hybrid-drive implosion system for ICF targets

    DOE Patents [OSTI]

    Mark, J.W.K.

    1987-10-14

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

  12. Energy-Efficient Cooling Control Systems for Data Centers | Department...

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

    Recovery and Reinvestment Act), recently demonstrated the effectiveness of intelligent energy management in eight State of California data centers. The system uses a network of...

  13. Micro-Modular Biopower System for Cooling, Heating and Power

    SciTech Connect (OSTI)

    2006-08-01

    This Congressionally-mandated project seeks to test a micro-modular biopower system for use on the Mount Wachusett Community College (MWCC) campus.

  14. Photoreversible Micellar Solution as a Smart Drag-Reducing Fluid for Use in District Heating/Cooling Systems

    E-Print Network [OSTI]

    Raghavan, Srinivasa

    Photoreversible Micellar Solution as a Smart Drag-Reducing Fluid for Use in District Heating solution is developed as a promising working fluid for district heating/cooling systems (DHCs). It can systems. A promising application of DR fluids is in district heating/ cooling systems (DHCs)9

  15. Effects of Velocity Correlation on Early Stage of Free Cooling Process of Inelastic Hard Sphere System

    E-Print Network [OSTI]

    Ryo Kawahara; Hiizu Nakanishi

    2003-10-29

    The free cooling process in the inelastic hard sphere system is studied by analysing the data from large scale molecular dynamics simulations on a three dimensional system. The initial energy decay, the velocity distribution function, and the velocity correlation functions are calculated to be compared with theoretical predictions. The energy decay rate in the homogeneous cooling state is slightly but distinctively smaller than that expected from the independent collision assumption. The form of the one particle velocity distribution is found not to be stationary. These contradict to the predictions of the kinetic theory based on the Enskog-Boltzmann equation and suggest that the velocity correlation is already important in the early stage of homogeneous cooling state. The energy decay rate is analysed in terms of the velocity correlation.

  16. Hand-held, mechanically cooled, radiation detection system for gamma-ray spectroscopy

    DOE Patents [OSTI]

    Burks, Morgan Thomas; Eckels, Joel Del

    2010-06-08

    In one embodiment, a radiation detection system is provided including a radiation detector and a first enclosure encapsulating the radiation detector, the first enclosure including a low-emissivity infra-red (IR) reflective coating used to thermally isolate the radiation detector. Additionally, a second enclosure encapsulating the first enclosure is included, the first enclosure being suspension mounted to the second enclosure. Further, a cooler capable of cooling the radiation detector is included. Still yet, a first cooling interface positioned on the second enclosure is included for coupling the cooler and the first enclosure. Furthermore, a second cooling interface positioned on the second enclosure and capable of coupling the first enclosure to a cooler separate from the radiation detection system is included. Other embodiments are also presented.

  17. Electronic copy available at: http://ssrn.com/abstract=2014739 Published as: Amir Nosrat and Joshua M. Pearce, "Dispatch Strategy and Model for Hybrid Photovoltaic and Combined Heating,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    M. Pearce, "Dispatch Strategy and Model for Hybrid Photovoltaic and Combined Heating, Cooling.02.044 Dispatch Strategy and Model for Hybrid Photovoltaic and Trigeneration Power Systems Amir Nosrat1 and Joshua of residential-scale photovoltaic (PV) arrays. These hybrid systems enjoy a symbiotic relationship between

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

    SciTech Connect (OSTI)

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

    2013-04-01

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

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

    E-Print Network [OSTI]

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

    2006-01-01

    The details of the Photovoltaic Thermal (PVT) hybrid air heating system, UTC air heating system and its effect on the performance of photovoltaic (PV) module and room temperature in KIER are explained in this paper. Two identical test rooms were...

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

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    from regenerative braking, or with scarce power capacity for fast acceleration. The experimental HEV to accept energy from regenerative braking. For this reason, hybrid systems use an auxiliary energy system