Sample records for rsl energy stirling

  1. RSL Energy | Open Energy Information

    Open Energy Info (EERE)

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  2. rsl

    National Nuclear Security Administration (NNSA)

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  3. Stirling Energy Systems` (SES) dish-Stirling program

    SciTech Connect (OSTI)

    Stone, K.W. [McDonnell Douglas, Huntington Beach, CA (United States); Braun, H.W.; Moore, M.I.; Clark, T.B. [Stirling Energy Systems, Inc., Phoenix, AZ (United States)

    1997-12-31T23:59:59.000Z

    This paper describes a system to produce electrical power from the sun, and the plans for preparing it for commercial operation. The point-focus, Stirling-engine-based system was designed and tested in the 1980s by McDonnell Douglas Corporation and United Stirling AB of Sweden (now part of Kockums AB). Stirling Energy Systems (SES) has acquired the existing hardware and technology, and plans to upgrade the system in order to utilize its demonstrated performance to produce grid-compatible electrical power. The performance includes a higher solar-to-electric conversion efficiency than any other renewable energy technology (approximately 30%), with the potential of a two to four point increase. The paper presents a summary description of the hardware, its past test program, proposed improvements, and the plan for commercialization.

  4. Remote Sensing Laboratory - RSL

    ScienceCinema (OSTI)

    None

    2015-01-09T23:59:59.000Z

    One of the primary resources supporting homeland security is the Remote Sensing Laboratory, or RSL. The Laboratory creates advanced technologies for emergency response operations, radiological incident response, and other remote sensing activities. RSL emergency response teams are on call 24-hours a day, and maintain the capability to deploy domestically and internationally in response to threats involving the loss, theft, or release of nuclear or radioactive material. Such incidents might include Nuclear Power Plant accidents, terrorist incidents involving nuclear or radiological materials, NASA launches, and transportation accidents involving nuclear materials. Working with the US Department of Homeland Security, RSL personnel equip, maintain, and conduct training on the mobile detection deployment unit, to provide nuclear radiological security at major national events such as the super bowl, the Indianapolis 500, New Year's Eve celebrations, presidential inaugurations, international meetings and conferences, just about any event where large numbers of people will gather.

  5. Remote Sensing Laboratory - RSL

    SciTech Connect (OSTI)

    None

    2014-11-06T23:59:59.000Z

    One of the primary resources supporting homeland security is the Remote Sensing Laboratory, or RSL. The Laboratory creates advanced technologies for emergency response operations, radiological incident response, and other remote sensing activities. RSL emergency response teams are on call 24-hours a day, and maintain the capability to deploy domestically and internationally in response to threats involving the loss, theft, or release of nuclear or radioactive material. Such incidents might include Nuclear Power Plant accidents, terrorist incidents involving nuclear or radiological materials, NASA launches, and transportation accidents involving nuclear materials. Working with the US Department of Homeland Security, RSL personnel equip, maintain, and conduct training on the mobile detection deployment unit, to provide nuclear radiological security at major national events such as the super bowl, the Indianapolis 500, New Year's Eve celebrations, presidential inaugurations, international meetings and conferences, just about any event where large numbers of people will gather.

  6. Stirling Cycles Inc | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with formSoutheastern IL Elec Coop,Lanka-DLRStandardStaxeraEthanolStirling Cycles

  7. In-line stirling energy system

    DOE Patents [OSTI]

    Backhaus, Scott N. (Espanola, NM); Keolian, Robert (State College, PA)

    2011-03-22T23:59:59.000Z

    A high efficiency generator is provided using a Stirling engine to amplify an acoustic wave by heating the gas in the engine in a forward mode. The engine is coupled to an alternator to convert heat input to the engine into electricity. A plurality of the engines and respective alternators can be coupled to operate in a timed sequence to produce multi-phase electricity without the need for conversion. The engine system may be operated in a reverse mode as a refrigerator/heat pump.

  8. RSL-2007-12

    Office of Environmental Management (EM)

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

    SciTech Connect (OSTI)

    Bowyer, J.M.

    1984-04-15T23:59:59.000Z

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

  10. Stirling number Identities and High energy String Scatterings

    E-Print Network [OSTI]

    Jen-Chi Lee; Yi Yang; Sheng-Lan Ko

    2009-09-22T23:59:59.000Z

    We use Stirling number identities developed recently in number theory to show that ratios among high energy string scattering amplitudes in the fixed angle regime can be extracted from the Kummer function of the second kind. This result not only brings an interesting bridge between string theory and combinatoric number theory but also sheds light on the understanding of algebraic structure of high energy stringy symmetry.

  11. Stirling Denmark Ltd | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries Pvt LtdShawangunk,SoutheastSt.SteepStimulation Prediction Models Jump to:Denmark

  12. rsl | National Nuclear Security Administration

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

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  13. Multi-stage Cascaded Stirling Refrigerator

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

    Energy Multi-stage Cascaded Stirling Refrigerator Multi-stage Cascaded Stirling Refrigerator Los Alamos National Laboratory (LANL) researchers have developed a multi-stage...

  14. Stirling Energy Systems Inc SES | Open Energy Information

    Open Energy Info (EERE)

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  15. Project Profile: Thermochemical Energy Storage for Stirling CSP Systems |

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

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  16. Infinia Corporation formerly Stirling Technology Company | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are8COaBulkTransmissionSitingProcess.pdfGetecGtel JumpCounty,Jump7Open Energy InformationProfessionalInergetic

  17. High-Energy String Scattering Amplitudes and Signless Stirling Number Identity

    E-Print Network [OSTI]

    Jen-Chi Lee; Catherine H. Yan; Yi Yang

    2012-07-18T23:59:59.000Z

    We give a complete proof of a set of identities (7) proposed recently from calculation of high-energy string scattering amplitudes. These identities allow one to extract ratios among high-energy string scattering amplitudes in the fixed angle regime from high-energy amplitudes in the Regge regime. The proof is based on a signless Stirling number identity in combinatorial theory. The results are valid for arbitrary real values $L$ rather than only for $L=0,1$ proved previously. The identities for non-integer real value $L$ were recently shown to be realized in high-energy compactified string scattering amplitudes [He S., Lee J.C., Yang Y., arXiv:1012.3158]. The parameter $L$ is related to the mass level of an excited string state and can take non-integer values for Kaluza-Klein modes.

  18. RSL: A parallel Runtime System Library for regional atmospheric models with nesting

    SciTech Connect (OSTI)

    Michalakes, J.G.

    1997-08-01T23:59:59.000Z

    RSL is a parallel runtime system library developed at Argonne National Laboratory that is tailored to regular-grid atmospheric models with mesh refinement in the form of two-way interacting nested grids. RSL provides high-level stencil and interdomain communication, irregular domain decomposition, automatic local/global index translation, distributed I/O, and dynamic load balancing. RSL was used with Fortran90 to parallelize a well-known and widely used regional weather model, the Penn State/NCAR Mesoscale model.

  19. The Green Potential of Free-Piston Stirling Engines

    E-Print Network [OSTI]

    Barth, Eric J.

    The Green Potential of Free-Piston Stirling Engines SGER: Green Energy via Control-Based Design of Free-Piston Stirling Engines Control Systems, Grant Number : 838874 Prof. Eric J. Barth, Mark Hofacker Vanderbilt University NSF CMMI Research and Innovation Conference 2009 What is a Free-Piston Stirling Engine

  20. Solar-Electric Dish Stirling System Development

    SciTech Connect (OSTI)

    Mancini, T.R.

    1997-12-31T23:59:59.000Z

    Electrical power generated with the heat from the sun, called solar thermal power, is produced with three types of concentrating solar systems - trough or line-focus systems; power towers in which a centrally-located thermal receiver is illuminated with a large field of sun-tracking heliostats; and dish/engine systems. A special case of the third type of system, a dish/Stirling system, is the subject of this paper. A dish/Stirling system comprises a parabolic dish concentrator, a thermal receiver, and a Stirling engine/generator located at the focus of the dish. Several different dish/Stirling systems have been built and operated during the past 15 years. One system claims the world record for net conversion of solar energy to electric power of 29.4%; and two different company`s systems have accumulated thousands of hours of on-sun operation. Due to de-regulation and intense competition in global energy markets as well as the immaturity of the technology, dish/Stirling systems have not yet found their way into the marketplace. This situation is changing as solar technologies become more mature and manufacturers identify high-value niche markets for their products. In this paper, I review the history of dish/Stirling system development with an emphasis on technical and other issues that directly impact the Stirling engine. I also try to provide some insight to the opportunities and barriers confronting the application of dish/Stirling in power generation markets.

  1. Proceedings of the 27th intersociety energy conversion engineering conference

    SciTech Connect (OSTI)

    Not Available

    1992-01-01T23:59:59.000Z

    This book contains the proceedings of the 27th Intersociety Energy Conversion Engineering Conference. Topics included: Stirling Cycle Analysis; Stirling Cycle Models; Stirling Refrigerators/Heat Pumps and Cryocoolers; Domestic Policy; Efficiency/Conservation; Stirling Solar Terrestrial; Stirling Component Technology; Environmental Impacts; Renewable Resource Systems; Stirling Power Generation; Stirling Heat Transport System Technology; and Stirling Cycle Loss Understanding.

  2. Stirling engine

    SciTech Connect (OSTI)

    Fujiwara, M.; Kazumoto, Y.; Nomaguchi, T.; Kashiwamura, K.

    1986-11-04T23:59:59.000Z

    This patent describes a Stirling engine wherein a pressure variation is provided by reciprocative movement of a displacer and is utilized by a power piston to obtain an output motive force, which comprises: a pressurized crankcase, an expansion cylinder having a seal carrying wall, a displacer located in the expansion cylinder, a displacer rod connected to the displacer and projecting through the seal and into the crankcase, a first elastic film attached to the displacer rod and to the seal carrying wall so as to produce a first hermetically sealed space, a compression cylinder, a power piston having a power piston rod located in the compression cylinder, a second elastic film attached to the power piston rod and to the compression cylinder so as to produce a second hermetically sealed space below the power piston, the first and the second hermetically sealed spaces being included in a pressurized reactive space, a pressure adjusting means for equalizing the mean pressure within the reactive space and the mean pressure within the crankcase, a heater tube, a regenerator, and a cooler tube are connected to the expansion cylinder, and are included in a working space, as is the expansion cylinder and the compression cylinder, and a first gas having a low viscosity, a low molecular weight and a high thermal conductivity is sealed in the working space and the reactive space, and a second gas having a high viscosity and a high molecular weight is sealed in the crankcase.

  3. Dish/Stirling High-Performance Thermal Storge

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

    Simulation of Heat Pipe-Assisted Latent Heat Thermal Energy Storage Unit for Dish-Stirling Systems" to ASME 2013 International Mechanical Engineering Congress & Exposition. *...

  4. Stirling Air Conditioner for Compact Cooling

    SciTech Connect (OSTI)

    None

    2010-09-01T23:59:59.000Z

    BEETIT Project: Infinia is developing a compact air conditioner that uses an unconventional high efficient Stirling cycle system (vs. conventional vapor compression systems) to produce cool air that is energy efficient and does not rely on polluting refrigerants. The Stirling cycle system is a type of air conditioning system that uses a motor with a piston to remove heat to the outside atmosphere using a gas refrigerant. To date, Stirling systems have been expensive and have not had the right kind of heat exchanger to help cool air efficiently. Infinia is using chip cooling technology from the computer industry to make improvements to the heat exchanger and improve system performance. Infinias air conditioner uses helium gas as refrigerant, an environmentally benign gas that does not react with other chemicals and does not burn. Infinias improvements to the Stirling cycle system will enable the cost-effective mass production of high-efficiency air conditioners that use no polluting refrigerants.

  5. Stirling cycle rotary engine

    SciTech Connect (OSTI)

    Chandler, J.A.

    1988-06-28T23:59:59.000Z

    A Stirling cycle rotary engine for producing mechanical energy from heat generated by a heat source external to the engine, the engine including: an engine housing having an interior toroidal cavity with a central housing axis for receiving a working gas, the engine housing further having a cool as inlet port, a compressed gas outlet port, a heated compressed gas inlet port, and a hot exhaust gas outlet port at least three rotors each fixedly mounted to a respective rotor shaft and independently rotatable within the toroidal cavity about the central axis; each of the rotors including a pair of rotor blocks spaced radially on diametrically opposing sides of the respective rotor shaft, each rotor block having a radially fixed curva-linear outer surface for sealed rotational engagement with the engine housing.

  6. Stirling engine application study

    SciTech Connect (OSTI)

    Teagan, W.P.; Cunningham, D.R.

    1983-03-01T23:59:59.000Z

    The potential for Stirling engine applications in the 0.5 to 5000 hp output range is assessed. The following are included: a market survey of potential engine applications, classification of applications, conventional engine markets and performance characteristics, status of Sterling engine systems, selection of application classes for Stirling engines, and the possible effects of technology, economic conditions, and regulatory changes. (MHR)

  7. Stirling engines. (Latest citations from the Aerospace database). Published Search

    SciTech Connect (OSTI)

    Not Available

    1993-09-01T23:59:59.000Z

    The bibliography contains citations concerning fuel consumption, engine design and testing, computerized simulation, and lubrication systems relative to the Stirling cycle engine. Solar energy conversion research, thermodynamic efficiency, economics, and utilization for power generation and automobile engines are included. Materials used in Stirling engines are briefly evaluated. (Contains 250 citations and includes a subject term index and title list.)

  8. Stirling-cycle refrigerator

    SciTech Connect (OSTI)

    Nakamura, K.

    1985-06-11T23:59:59.000Z

    A Stirling-cycle refrigerator comprises a plurality of Stirling-cycle refrigerator units each having a displacer defining an expansion chamber, a piston defining a compression chamber, and a circuit including a heater and a cooler and interconnecting the expansion chamber and the compression chamber, and a heat exchanger shared by the circuits and disposed between the coolers and the heaters for effecting heat exchange between working gases in the circuits. The heat exchanger may comprise a countercurrent heat exchanger, and the Stirling-cycle refrigerator units are operated in cycles which are 180/sup 0/ out of phase with each other.

  9. M. Bahrami ENSC 461 (S 11) Stirling Cycle 1 Stirling Cycle

    E-Print Network [OSTI]

    Bahrami, Majid

    M. Bahrami ENSC 461 (S 11) Stirling Cycle 1 Stirling Cycle In Stirling cycle, Carnot cycle). The regenerator is assumed to be reversible heat transfer device. Fig. 3-2: T-s and P-v diagrams for Stirling The Stirling cycle was invented by Robert Stirling in 1816. The execution of the Stirling cycle requires

  10. Trends in dish-Stirling solar receiver designs

    SciTech Connect (OSTI)

    Diver, R.B.; Andraka, C.E.; Moreno, J.B.; Adkins, D.R.; Moss, T.A.

    1990-01-01T23:59:59.000Z

    The dish-Stirling solar energy system, because of its high efficiency, is a leading candidate for producing low-cost electric power from the sun. Dish-Stirling receiver design involves dealing with non-uniform and highly concentrated solar flux at high temperatures (700--800{degree}C) and, therefore, presents a variety of technical challenges. The technology is in the process of evolving from directly illuminated heater-head tube receivers'' to receivers that use refluxing (i.e., gravity assisted) liquid metals as an intermediate heat transfer fluid. Modern dish-Stirling development was initiated in the late 1970s by the Jet Propulsion Laboratory for the Department of Energy. The JPL technology development with United Stirling, Inc. involved the USAB 4.95 Stirling engine and directly illuminated heater-head tube receivers. This work eventually led to the successful demonstrations and world record efficiencies by Advanco Corp., and to the attempted commercialization of the technology by McDonnell Douglas Corp. The severe nature of concentrated solar flux and the potential advantages of heat-pipe technology have caused an evolution toward reflux'' receivers. These receivers are just beginning to be tested in the laboratory and integrated with dish-Stirling systems. In this paper, the history and current status of dish-Stirling receiver development are presented and discussed. The technical challenges to be addressed by the dish-Stirling community and the future plans at Sandia are outlined. 52 refs., 9 figs.

  11. Dish/Stirling for Department of Defense applications final report

    SciTech Connect (OSTI)

    Diver, R.B.; Menicucci, D.F. [Sandia National Labs., Albuquerque, NM (United States). Energy and Environment Div.] [Sandia National Labs., Albuquerque, NM (United States). Energy and Environment Div.

    1997-03-01T23:59:59.000Z

    This report describes a Strategic Environmental Research and Development Program (SERDP) project to field a dish/Stirling system at a southwestern US military facility. This project entitled ``Dish/Stirling for DoD Applications`` was started in August 1993 and was completed in September 1996. The project`s objective was to assist military facilities to field and evaluate emerging environmentally sound and potentially economical dish/Stirling technology. Dish/Stirling technology has the potential to produce electricity at competitive costs while at the same time providing a secure and environmentally benign source of power. In accordance with the SERDP charter, this project leveraged a US Department of Energy (DOE) cost-shared project between Sandia National Laboratories and Cummins Power Generation, Inc. (CPG). CPG is a wholly owned subsidiary of Cummins Engine Company, a leading manufacturer of diesel engines. To accomplish this objective, the project called for the installation of a dish/Stirling system at a military facility to establish first-hand experience in the operation of a dish/Stirling system. To scope the potential DoD market for dish/Stirling technology and to identify the site for the demonstration, a survey of southwestern US military facilities was also conducted. This report describes the project history, the Cummins dish/Stirling system, results from the military market survey, and the field test results.

  12. Formula di Stirling Tiziano Vargiolu

    E-Print Network [OSTI]

    Vargiolu, Tiziano

    Formula di Stirling Tiziano Vargiolu Dipartimento di Matematica Pura ed Applicata via Trieste, 63 - 35121 Padova email: vargiolu@math.unipd.it 16 maggio 2012 1 Formula di Stirling Scopo di questa nota `e grande, con la cosiddetta formula di Stirling n! 2n n e n (1) dove e = 2.71 . . . `e il numero di

  13. The Phillips Stirling engine

    SciTech Connect (OSTI)

    Hargreaves, C.M.

    1991-01-01T23:59:59.000Z

    This book is about the Stirling engine and its development from the heavy cast-iron machine of the 19th century to that of today. It is a history of a research effort spanning nearly 50 years, together with an outline of principles, and some technical details and descriptions of the more important engines. Contents include: the hot-air engine; the 20th-century revival; the Stirling cycle; rhombic-drive engines; heating and cooling; pistons and seals; electric generators and heat pumps; exotic heat sources; the engine and the environment; swashplate engines; and the past and the future.

  14. A Study on Design Parameters of Stirling Engines for Buildings

    E-Print Network [OSTI]

    Ding, G.; Huang, S.; Zhang, C.; Hu, X.; Zhang, X.

    2006-01-01T23:59:59.000Z

    One of the most promising projects in the application of combined heat and power(CHP) lies in energy production for buildings. Stirling engines are very applicable to residential buildings, especially because of the higher electricity...

  15. Stirling engine piston ring

    DOE Patents [OSTI]

    Howarth, Roy B. (Clifton Park, NY)

    1983-01-01T23:59:59.000Z

    A piston ring design for a Stirling engine wherein the contact pressure between the piston and the cylinder is maintained at a uniform level, independent of engine conditions through a balancing of the pressure exerted upon the ring's surface and thereby allowing the contact pressure on the ring to be predetermined through the use of a preloaded expander ring.

  16. Self-pressurizing Stirling engine

    DOE Patents [OSTI]

    Bennett, Charles L. (Livermore, CA)

    2010-10-12T23:59:59.000Z

    A solar thermal powered aircraft powered by heat energy from the sun. A heat engine, such as a Stirling engine, is carried by the aircraft body for producing power for a propulsion mechanism, such as a propeller. The heat engine has a thermal battery in thermal contact with it so that heat is supplied from the thermal battery. A solar concentrator, such as reflective parabolic trough, is movably connected to an optically transparent section of the aircraft body for receiving and concentrating solar energy from within the aircraft. Concentrated solar energy is collected by a heat collection and transport conduit, and heat transported to the thermal battery. A solar tracker includes a heliostat for determining optimal alignment with the sun, and a drive motor actuating the solar concentrator into optimal alignment with the sun based on a determination by the heliostat.

  17. Gnrateur tubulaire asynchrone pour cognrateur Stirling Pierre FRANCOIS, Laurent PREVOND, Hamid BEN AHMED, Bernard MULTON,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Générateur tubulaire asynchrone pour cogénérateur Stirling Pierre FRANCOIS, Laurent PREVOND, Hamid `Actionneurs-Transport-Energie'. Résumé--L'étude concerne un cogénérateur Stirling d'une puissance de quelques kilowatts. Ce cogénérateur est animé par deux moteurs Stirling travaillant en opposition. Le générateur est

  18. Design of Stirling-driven vapor-compression system

    SciTech Connect (OSTI)

    Kagawa, N.

    1998-07-01T23:59:59.000Z

    Stirling engines have many unique advantages including higher thermal efficiencies, preferable exhaust gas characteristics, multi-fuel usage, and low noise and vibration. On the other hand, heat pump systems are very attractive for space heating and cooling and industrial usage because of their potential to save energy. Especially, there are many environmental merits of Stirling-driven vapor-compression (SDVC) systems. This paper introduces a design method for the SDVC based on reliable mathematical methods for Stirling and Rankine cycles with reliable thermophysical information for refrigerants. The model treats a kinematic Stirling engine and a scroll compressor coupled by a belt. Some experimental coefficients are used to formulate the SDVC items. The obtained results show the performance behavior of the SDVC in detail. The measured performance of the actual system agrees with the calculated results. Furthermore, the calculated results indicate attractive SDVC performance using alternative refrigerants.

  19. Stirling cycle engine

    DOE Patents [OSTI]

    Lundholm, Gunnar (Lund, SE)

    1983-01-01T23:59:59.000Z

    In a Stirling cycle engine having a plurality of working gas charges separated by pistons reciprocating in cylinders, the total gas content is minimized and the mean pressure equalization among the serial cylinders is improved by using two piston rings axially spaced at least as much as the piston stroke and by providing a duct in the cylinder wall opening in the space between the two piston rings and leading to a source of minimum or maximum working gas pressure.

  20. Stirling engine power control

    DOE Patents [OSTI]

    Fraser, James P. (Scotia, NY)

    1983-01-01T23:59:59.000Z

    A power control method and apparatus for a Stirling engine including a valved duct connected to the junction of the regenerator and the cooler and running to a bypass chamber connected between the heater and the cylinder. An oscillating zone of demarcation between the hot and cold portions of the working gas is established in the bypass chamber, and the engine pistons and cylinders can run cold.

  1. Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Computing Science and Mathematics University of Stirling The ACCENT Policy System for Home Care and Mathematics University of Stirling The ACCENT Policy System for Home Care Kenneth J. Turner Computing Science and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone +44-1786-467423, Facsimile +44

  2. Stirling machines: adiabatic to isothermal

    SciTech Connect (OSTI)

    West, C.D.

    1986-01-01T23:59:59.000Z

    In most real Stirling engines the gas behavior in the cylinder is almost adiabatic, in contrast to the ideal Stirling engine in which all processes are isothermal. The combination of nearly adiabatic cylinders and nearly isothermal heat exchangers found in most Stirling engines leads to irreversibilities and loss of efficiency. Still worse, in many cases, is the performance of cylinders with a finite heat transfer intermediate between a near-adiabatic and near-isothermal behavior. Because of this behavior and because of the low thermal diffusivity of high-pressure gases, there is little hope of sufficiently enhancing the heat transfer within the cylinder of a conventional Stirling engine to increase the efficiency - in most cases, a decrease is more likely to result.

  3. 50 KW Stirling engine

    SciTech Connect (OSTI)

    Ishizaki, Y.; Haramura; Kondoh, T.; Yamaguchi, K.; Yamaguchi, S.

    1982-08-01T23:59:59.000Z

    This paper presents an outline of the 50KW Stirling engine (4-189D.A.), called ''MT79'', as well as of its performance which was built by AISIN in 1980. The engine features a newly developed swash plate mechanism with floating plates. The engine, which uses Helium, has been successfully tested for over 1,000 hours, demonstrating a maximum horsepower of 52KW (71PS) /2,500rpm, maximum efficiency of 31% /700rpm, and maximum torque of 30kgf-m /500rpm. The performance of the engine is presented with these experimental results: Engine power, Torque, and Efficiency vs. Revolution; Heat balance; P-V diagram of expansion space and compression space; Noise level. The engine demonstrates the characteristics of a higher torque and a higher efficiency at lower speeds, and with low noise. Therefore, it was found that in a specific area, the engine shows characteristics surpassing those found in internal combustion engines.

  4. Combinatorially interpreting generalized Stirling John Engbers

    E-Print Network [OSTI]

    Galvin, David

    Combinatorially interpreting generalized Stirling numbers John Engbers David Galvin Justin Hilyard to as the Stirling numbers (of the second kind) of w. The nomenclature comes from the fact that when w = (xD)n, we have Sw(k) = n k , the ordinary Stirling number of the second kind. Explicit expressions for

  5. ENUMERATION FORMUL FOR PATTERN RESTRICTED STIRLING PERMUTATIONS

    E-Print Network [OSTI]

    Kuba, Markus

    ENUMERATION FORMUL? FOR PATTERN RESTRICTED STIRLING PERMUTATIONS MARKUS KUBA AND ALOIS PANHOLZER ABSTRACT. We classify k-Stirling permutations avoiding a set of ordered patterns of length three according, and also structural decompositions of k-Stirling permutations via the so-called block decomposition, or via

  6. Thermoacoustic Stirling Engine --An acoustic amplifier

    E-Print Network [OSTI]

    Lee, Dongwon

    Thermoacoustic Stirling Engine -- An acoustic amplifier: ambient heat exchanger (water) stacked kW sound hot diesel exhaust hot diesel exhaust 34" 24" Thermoacoustic Stirling Engine -- An acoustic@lanl.gov 505-667-7545 A lighter, smaller, faster, cheaper version of free-piston Stirling 500W Lightweight

  7. Chemistry 593: Stirling's Formula David Ronis

    E-Print Network [OSTI]

    Ronis, David M.

    Chemistry 593: Stirling's Formula © David Ronis McGill University There is a simple way to obtain) Winter, 2014 #12;Chemistry 593 -2- Stirling's Formula which implies that ln(x!)x ln(x) - x + ln[(2 x)1/2 ]. (4') Clearly, for xO(1023 ), the last logarithm is negligible, and the simple form of Stirling

  8. University of Stirling Department of Computing Science

    E-Print Network [OSTI]

    Edinburgh, University of

    University of Stirling Department of Computing Science EPSRC Industrial CASE PhD Studentship Position Available at: The University of Stirling, Scotland, UK In collaboration with: Harvard Medical by the principal investigator and academic supervisor, Dr. A. Hussain (Stirling), in collaboration with the two

  9. The Jacobi-Stirling Numbers

    E-Print Network [OSTI]

    Andrews, George E; Gawronski, Wolfgang; Littlejohn, Lance L

    2011-01-01T23:59:59.000Z

    The Jacobi-Stirling numbers were discovered as a result of a problem involving the spectral theory of powers of the classical second-order Jacobi differential expression. Specifically, these numbers are the coefficients of integral composite powers of the Jacobi expression in Lagrangian symmetric form. Quite remarkably, they share many properties with the classical Stirling numbers of the second kind which, as shown in LW, are the coefficients of integral powers of the Laguerre differential expression. In this paper, we establish several properties of the Jacobi-Stirling numbers and its companions including combinatorial interpretations thereby extending and supplementing known contributions to the literature of Andrews-Littlejohn, Andrews-Gawronski-Littlejohn, Egge, Gelineau-Zeng, and Mongelli.

  10. The Stirling alternative. Power systems, refrigerants and heat pumps

    SciTech Connect (OSTI)

    Walker, G.; Reader, G.; Fauvel, O.R.; Bingham, E.R. (Univ. of Calgary, Alberta (Canada))

    1993-01-01T23:59:59.000Z

    This book provides an up-to-date reference on the technology, history, and practical applications of Stirling engines, including recent developments in the field and a convenient survey of the Stirling engine literature. The topics of the book include: fundamentals of Stirling technology, definition and terminology, thermodynamic laws and cycles: some elementary considerations, the Stirling cycle, practical regenerative cycle, theoretical aspects and computer simulation of Stirling machines, mechanical arrangements, control systems, heat exchangers, performance characteristics, working fluids, applications of Stirling machines, advantages of Stirling machines, disadvantages of Stirling machines, Stirling versus internal combustion engines, Stirling versus Rankine engines, applications for Stirling machines, Stirling power systems, the literature and sources of supply, the literature of Stirling engines, and the literature of cryocoolers.

  11. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling Extending the model of the Decision Tree Richard Bland Department of Computing Science and Mathematics University of Stirling Stirling of Stirling Dawn Dowding Department of Nursing and Midwifery University of Stirling Technical Report CSM-162

  12. A Dozen Proofs of Stirling's Formula Steven R. Dunbar

    E-Print Network [OSTI]

    Dunbar, Steve

    Stirling's Formula Steven R. Dunbar Supporting Formulas Stirling's Formula Proof Methods A Dozen Proofs of Stirling's Formula Steven R. Dunbar March 31, 2012 1 / 15 #12;Stirling's Formula Steven R. Dunbar Supporting Formulas Stirling's Formula Proof Methods Wallis' Formula Wallis' Formula

  13. Stirling engine with pressurized crankcase

    SciTech Connect (OSTI)

    Corey, John A. (Melrose, NY)

    1988-01-01T23:59:59.000Z

    A two piston Stirling engine wherein the pistons are coupled to a common crankshaft via bearing means, the pistons include pad means to minimize friction between the pistons and the cylinders during reciprocation of the pistons, means for pressurizing the engine crankcase, and means for cooling the crankshaft and the bearing means eliminating the need for oil in the crankcase.

  14. Overview of Multi-Kilowatt Free-Piston Stirling Power Conversion Research at GRC

    SciTech Connect (OSTI)

    Geng, Steven M.; Mason, Lee S.; Dyson, Rodger W. [Thermal Energy Conversion Branch, NASA Glenn Research Center 21000 Brookpark Rd., Cleveland, OH 44135 (United States); Penswick, L. Barry [SEST Inc., 18000 Jefferson Park, Middleburg Hts, OH 44130 (United States)

    2008-01-21T23:59:59.000Z

    As a step towards development of Stirling power conversion for potential use in Fission Surface Power (FSP) systems, a pair of commercially available 1 kW class free-piston Stirling convertors and a pair of commercially available pressure wave generators (which will be plumbed together to create a high power Stirling linear alternator test rig) have been procured for in-house testing at Glenn Research Center. Delivery of both the Stirling convertors and the linear alternator test rig is expected by October, 2007. The 1 kW class free-piston Stirling convertors will be tested at GRC to map and verify performance. The convertors will later be modified to operate with a NaK liquid metal pumped loop for thermal energy input. The high power linear alternator test rig will be used to map and verify high power Stirling linear alternator performance and to develop power management and distribution (PMAD) methods and techniques. This paper provides an overview of the multi-kilowatt free-piston Stirling power conversion work being performed at GRC.

  15. ON STIRLING NUMBERS FOR COMPLEX ARGUMENTS AND HANKEL CONTOURS

    E-Print Network [OSTI]

    Prodinger, Helmut

    ON STIRLING NUMBERS FOR COMPLEX ARGUMENTS AND HANKEL CONTOURS provide a natural generalization of Stirling numbers for unrestricted complex values. Introduction Richmond and Merlini have introduced in [5] an extension of Stirling's subset numbers xy

  16. A FINITE DIFFERENCE APPROACH TO DEGENERATE BERNOULLI AND STIRLING POLYNOMIALS

    E-Print Network [OSTI]

    Adelberg, Arnold

    A FINITE DIFFERENCE APPROACH TO DEGENERATE BERNOULLI AND STIRLING POLYNOMIALS Arnold Adelberg, 1992 1 #12; RUNNING HEAD: Degen Bernoulli/Stirling Pols Professor Arnold Adelberg Department parameters), which includes Bernoulli and Stirling polynomials and various generalizations, is developed

  17. Isotope powered Stirling generator for terrestrial applications

    SciTech Connect (OSTI)

    Tingey, G.L.; Sorensen, G.C. [Pacific Northwest Lab., Richland, WA (United States); Ross, B.A. [Stirling Technology Co., Richland, WA (United States)

    1995-01-01T23:59:59.000Z

    An electric power supply, small enough to be man-portable, is being developed for remote, terrestrial applications. This system is designed for an operating lifetime of five years without maintenance or refueling. A small Radioisotope Stirling Generator (RSG) has been developed. The energy source of the generator is a 60 watt plutonium-238 fuel clad used in the General Purpose Heat Sources (GPHS) developed for space applications. A free piston Stirling Engine drives a linear alternator to convert the heat to power. The system weighs about 7.5 kg and produces 11 watts AC power with a conversion efficiency of 18.5%. Two engine models have been designed, fabricated, and tested to date: (a) a developmental model instrumented to confirm and test parameters, and (b) an electrically heated model with an electrical heater equipped power input leads. Critical components have been tested for 10,000 to 20,000 hours. One complete generator has been operating for over 11,000 hours. Radioisotope heated prototypes are expected to be fabricated and tested in late 1995.

  18. Finite-time thermodynamic analysis of the Stirling engine

    SciTech Connect (OSTI)

    Ibrahim, O.M. [Univ. of Rhode Island, Kingston, RI (United States). Mechanical Engineering Dept.; Ladas, H.G. [Environmental Engineering Corp., North Kingstown, RI (United States)

    1995-12-31T23:59:59.000Z

    This paper presents a finite-time thermodynamic analysis of the Stirling engine cycle. A lumped-parameter thermodynamic model is used to describe the dynamic behavior of the Stirling engine. The mathematical formulation of this model is based on mass and energy balances with associated heat transfer rate equations. These governing equations are formulated into a set of ordinary differential equations, which are then solved numerically to obtain the dynamic behavior of the Stirling engine. Close inspection of the governing equations reveals that the time to complete on cycle, {tau} and the engine time constant, {tau}{sub c} always appear together in a dimensionless ratio. This ratio, {tau}/{tau}{sub c}, is defined here as the Finite-Time Parameter, FTP. The effects of FTP upon power output and efficiency, are studied. The results show that there exists an optimum power output for a given engine design, based on engine speed and heat-transfer contact time. The results also provide an engineering evaluation procedure to improve the efficiency and power output of Stirling engines.

  19. On q-deformed Stirling numbers

    E-Print Network [OSTI]

    Yilmaz Simsek

    2007-11-03T23:59:59.000Z

    The purpose of this article is to introduce q-deformed Stirling numbers of the first and second kinds. Relations between these numbers, Riemann zeta function and q-Bernoulli numbers of higher order are given. Some relations related to the classical Stirling numbers and Bernoulli numbers of higher order are found. By using derivative operator to the generating function of the q-deformed Stirling numbers of the second kinds, a new function is defined which interpolates the q-deformed Stirling numbers of the second kinds at negative integers. The recurrence relations of the Stirling numbers of the first and second kind are given. In addition, relation between q-deformed Stirling numbers and q-Bell numbers is obtained.

  20. Chemistry 365: Stirling's Formula David Ronis

    E-Print Network [OSTI]

    Ronis, David M.

    Chemistry 365: Stirling's Formula © David Ronis McGill University There is a simple way to obtain;Chemistry 365 -2- Stirling's Formula x!(2 )1/2 xx+1/2 e-x , (4) which implies that ln(x!)x ln(x) - x + ln[(2 of Stirling's formula ln(x!)x[ln(x) - 1], is obtained. With a little extra effort you can work out the next

  1. Dish-Stirling Joint Venture Program

    SciTech Connect (OSTI)

    NONE

    1993-12-31T23:59:59.000Z

    A brief report about DOE/Sandia National Laboratories/Cummins Engine Company dish-Stirling solar electric engine system being perfected.

  2. Heater head for Stirling engine

    SciTech Connect (OSTI)

    White, M.A.; Emigh, S.G.

    1987-06-09T23:59:59.000Z

    This patent describes a heater head for a Stirling engine comprising: a housing for enclosing the heater head with gas at a substantial elevated pressure; insulator means attached to the housing for insulating the heater head; inlet means attached to a regenerator in the housing for admission of relatively high pressure working fluid from the regenerator of a Stirling engine; a first annular heating wall in the housing attached to the inlet means for heating the working fluid; and, a second annular heating wall in the housing concentric with the first heating wall but of lesser diameters so that an annular space is formed between the first heating wall and the second heating wall for heating working fluid; and a third heating wall in the housing concentric with and smaller in diameter than the second heating wall forming the condensing area of a heat pipe between the second heating wall and the third heating wall.

  3. The development of a kinematic Stirling-engine-driven heat pump

    SciTech Connect (OSTI)

    Monahan, R.E.; Kountz, K.J.; Clinch, J.M.

    1987-06-01T23:59:59.000Z

    The continuing development of a 10-ton light commercial natural-gas-fired kinematic Stirling-engine-driven heat pump system is described. Basic Stirling cycle thermodynamics are presented, and a complete engine heat balance is shown to detail the inherent advantages of the V160 Stirling engine as a prime mover in a heat pump package. Results from environmental laboratory testing of a breadboard prototype are reviewed, and the test procedures used in the evaluation are explained. Seasonal performance of the heat pump package was predicted using a bin-temperature method based on Chicago and Dallas climatic data. Annual energy costs, as predicted by the seasonal performance analytical computer program, have been calculated for a gas furnace, standard electric heat pump, and the Stirling engine-driven prototype heat pump package. These computed costs for these systems are listed and compared.

  4. The low temperature differential Stirling engine with working fluid operated on critical condition

    SciTech Connect (OSTI)

    Naso, V.; Dong, W.; Lucentini, M.; Capata, R.

    1998-07-01T23:59:59.000Z

    The research and development of low temperature differential Stirling engine has a great potential market since a lot of thermal energy at low temperature can supply it and the cost of this kind of engine is lower than general Stirling engine. The characteristics of low compression ratio and low differential temperature Stirling engine may be satisfied with working fluid compressed on critical conditions. By combining two phase heat transfer with forced convective flow in compression space and through the regenerator in the engine, a new heat transfer coefficient emerges capable of absorbing and releasing high heat fluxes without the corresponding low temperature increase. The current analysis focuses on the study of Stirling engines with working fluid compressed on critical conditions, thus at two-phase heat transfer in compression space and regenerator of the engine under forced convective flow conditions.

  5. Assessment and economic analysis of the MOD III Stirling-engine driven chiller system. Final report, October 1989-July 1990

    SciTech Connect (OSTI)

    Moryl, J.

    1990-07-01T23:59:59.000Z

    The Stirling engine is an inherently clean and efficient engine. With the requirements for environmentally benign emissions and high energy efficiency, the Stirling engine is an attractive alternative to both internal combustion (IC) engines and electric motors. The study evaluated a Stirling-engine-driven chiller package. Technically, the Stirling engine is a good selection as a compressor drive, with inherently low vibrations, quiet operation, long life, and low maintenance. Exhaust emissions are below the projected 1995 stringent California standards. Economically, the Stirling-engine-driven chiller is a viable alternative to both IV-engine and electric-driven chillers, trading off slightly higher installed cost against lower total operating expenses. The penetration of a small portion of the projected near-term stationary engine market opportunity will provide the volume production basis to achieve competitively priced engines.

  6. Congeneration system with a Stirling engine

    SciTech Connect (OSTI)

    Meijer, R.J.; Meijer, E.J.; Godett, T.M.

    1991-12-24T23:59:59.000Z

    This patent describes a cogeneration system for producing process heat for useful purposes and electric energy. It comprises an electric generator; a Stirling cycle engine having an output shaft operatively coupled to the generator for driving the generator, the engine including at least one internal fuel combustor; means for circulating a cooling liquid about the generator and engine to extract heat therefrom; an exhaust system coupled with the engine for exhausting combustion gases from the engine, the exhaust system including a condensing heat exchanger for cooling the combustion gases below the condensing, temperature of the water vapor in the exhaust gases; means for directing the cooling liquid around the condensing heat exchanger to extract heat therefrom and heat the liquid; and means for directing the cooling liquid for useful purposes.

  7. Stirling cycle piston and valving method

    SciTech Connect (OSTI)

    Mitchell, M.P.; Bauwens, L.

    1990-05-22T23:59:59.000Z

    This patent describes a device of the Stirling cycle type for converting energy between heat and work. It comprises: compression and expansion chambers, means for decreasing the volume of one of the chambers while increasing the volume of the other chamber, gas storage means comprising first and second regenerator means, each connected to the expansion chamber and to the compression chamber, a quantity of compressible gas confined for circulation through the chambers and gas storage means, control means for communicating the first regenerator means only to the expansion chamber while communicating the second regenerator means only to the compression chamber and subsequently communicating the second regenerator means only to the expansion chamber while communicating the first regenerator means only to the compression chamber with intermediate steps of closing one of the regenerator means while exchanging fluid between the chambers through the other regenerator means.

  8. A rook theory model for product formulas & poly-Stirling numbers

    E-Print Network [OSTI]

    Miceli, Brian K.

    2006-01-01T23:59:59.000Z

    4.5 Poly-StirlingType II -Poly-Stirling Numbers . . . . . . . . . . . . . .xiii 1 Classical Rook Theory, Stirling Numbers, -

  9. UNIVERSITY OF STIRLING SCHOOL OF ARTS AND HUMANITIES

    E-Print Network [OSTI]

    Little, Tony

    UNIVERSITY OF STIRLING SCHOOL OF ARTS AND HUMANITIES LITERATURE AND LANGUAGES STIRLING CENTRE STUDENTSHIP The University of Stirling is pleased to invite applications for a three-year Collaborative be arranged. This studentship will be a collaboration between the Stirling Centre for International Publishing

  10. A Short Note on Unsigned Stirling Numbers Dennis Walsh

    E-Print Network [OSTI]

    Walsh, Dennis P.

    A Short Note on Unsigned Stirling Numbers Dennis Walsh Middle Tennessee State University The unsigned Stirling numbers | , the absolute values of Stirling numbers of the=Ð8? 5?l first kind, are well Stirling number Thel=Ð8? 5?l? following theorem formalizes this result. Theorem. For let denote an unsigned

  11. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Shankland, Carron

    Department of Computing Science and Mathematics University of Stirling Deriving Mean Field of Stirling Deriving Mean Field Equations from Large Process Algebra Models Chris McCaig Rachel Norman Carron Shankland Department of Computing Science and Mathematics University of Stirling Stirling FK9 4LA, Scotland

  12. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling APPEL: An Adaptable Science and Mathematics University of Stirling APPEL: An Adaptable and Programmable Policy Environment Department of Computing Science and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone

  13. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling Timed DILL: Digital Logic of Computing Science and Mathematics University of Stirling Timed DILL: Digital Logic in LOTOS Ji He and Kenneth J. Turner Department of Computing Science and Mathematics University of Stirling Stirling FK9 4LA

  14. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling The ACCENT Policy Server-9673 August 2013 #12;#12;Department of Computing Science and Mathematics University of Stirling The ACCENT of Computing Science and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone +44 1786 467

  15. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Hammerton, James

    Department of Computing Science and Mathematics University of Stirling A Technical Description 2010 #12;#12;Department of Computing Science and Mathematics University of Stirling A Technical and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone +44 1786 467 421, Facsimile +44 1786

  16. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling An Integrated Methodology 1460-9673 October 2010 #12;#12;Department of Computing Science and Mathematics University of Stirling Department of Computing Science and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone

  17. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling Policies for H.323 Internet of Computing Science and Mathematics University of Stirling Policies for H.323 Internet Telephony Tingxue (Sean) Huang Department of Computing Science and Mathematics University of Stirling Stirling FK9 4LA, Scotland

  18. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling Writing Decision Trees of Stirling Stirling FK9 4LA Scotland Claire E Beechey Department of Computing Science and Mathematics University of Stirling Dawn Dowding Hull York Medical School University of York Technical Report CSM-163 ISSN

  19. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling Modelling and Verifying #12;Department of Computing Science and Mathematics University of Stirling Modelling and Verifying University of Stirling Stirling FK9 4LA, Scotland Telephone +44-786-467421, Facsimile +44-786-464551 Email

  20. UNIVERSITY OF STIRLING SCHOOL OF ARTS AND HUMANITIES

    E-Print Network [OSTI]

    Little, Tony

    1 UNIVERSITY OF STIRLING SCHOOL OF ARTS AND HUMANITIES LITERATURE AND LANGUAGES STIRLING CENTRE STUDENTSHIP FURTHER INFORMATION The Stirling Centre for International Publishing and Communication (www.publishing.stir.ac.uk) at the University of Stirling is pleased to invite applications for a three-year Collaborative Doctoral Studentship

  1. Stable multivariate Eulerian polynomials and generalized Stirling permutations

    E-Print Network [OSTI]

    Haglund, Jim

    Stable multivariate Eulerian polynomials and generalized Stirling permutations J. Haglund, Mirk Abstract We study Eulerian polynomials as the generating polynomials of the descent statistic over Stirling Eulerian polyno- mial for permutations, and extends naturally to r-Stirling and generalized Stirling

  2. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Fernandez, Thomas

    Department of Computing Science and Mathematics University of Stirling Gen-O-Fix: An embeddable and Mathematics University of Stirling Gen-O-Fix: An embeddable framework for Dynamic Adaptive Genetic Improvement and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone +44 1786 467 421, Facsimile +44 1786

  3. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling Case Studies Using CRESS #12;#12;Department of Computing Science and Mathematics University of Stirling Case Studies Using and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone +44 1786 467 421, Facsimile +44 1786

  4. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Verbrugge, Clark

    Department of Computing Science and Mathematics University of Stirling Exploiting the m4 Macro and Mathematics University of Stirling Exploiting the m4 Macro Language Kenneth J. Turner Department of Computing Science and Mathematics, University of Stirling Stirling FK9 4LA, Scotland Telephone +44

  5. A NOTE ON STIRLING SERIES MARKUS KUBA AND HELMUT PRODINGER

    E-Print Network [OSTI]

    Wagner, Stephan

    A NOTE ON STIRLING SERIES MARKUS KUBA AND HELMUT PRODINGER Abstract. We study sums S = S(d, n, k The unsigned Stirling numbers of the first kind, also called Stirling cycle numbers, are defined the Kronecker delta function. Throughout this work we use Knuth's notation n k . It is well known that Stirling

  6. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling Extending Hardware-9673 February 2000 #12;#12;Department of Computing Science and Mathematics University of Stirling Extending and Mathematics University of Stirling Stirling FK9 4LA, Scotland Telephone +44-1786-467-421, Facsimile +44

  7. Testing of a variable-stroke Stirling engine

    SciTech Connect (OSTI)

    Thieme, L.G.; Allen, D.J.

    1986-01-01T23:59:59.000Z

    Testing of a variable-stroke Stirling engine at NASA Lewis has been completed. In support of the US Department of Energy's Stirling Engine Highway Vehicle Systems Program, the engine was tested for about 70 hr total with both helium and hydrogen working fluids over a range of pressures and strokes. A direct comparison was made of part-load efficiencies obtained with variable-stroke and variable-pressure operation. Two failures with the variable-angle swash-plate drive system limited testing to low power levels. These failures are not thought to be caused by problems inherent in the variable-stroke concept but they do emphasize the need for careful design in the area of the crossheads where the failures occurred. This paper describes these failures and the efforts to resolve the associated problems, and presents test results that were obtained. 5 refs., 17 figs.

  8. Design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range

    SciTech Connect (OSTI)

    None

    1980-02-01T23:59:59.000Z

    Initial work in a project on the design and development of Stirling engines for stationary integrated energy systems is reported. Information is included on a market assessment, design methodology, evaluation of engine thermodynamic performance, and preliminary system design. It is concluded that Stirling engines employing clean fossil fuels cannot compete with diesel engines. However, combustion technology exists for the successful burning of coal-derived fuels in a large stationary stirling engine. High thermal efficiency is predicted for such an engine and further development work is recommended. (LCL)

  9. Radioisotope Stirling Generator Options for Pluto Fast Flyby Mission

    SciTech Connect (OSTI)

    Schock, Alfred

    1993-10-01T23:59:59.000Z

    The preceding paper described conceptual designs and analytical results for five Radioisotope Thermoelectric Generator (RTG) options for the Pluto Fast Flyby (PFF) mission, and the present paper describes three Radioisotope Stirling Generator (RSG) options for the same mission. The RSG options are based on essentially the same radioisotope heat source modules used in previously flown RTGs and on designs and analyses of a 75-watt free-piston Stirling engine produced by Mechanical Technology Incorporated (MTI) for NASA's Lewis Research Center. The integrated system design options presented were generated in a Fairchild Space study sponsored by the Department of Energy's Office of Special Applications, in support of ongoing PFF mission and spacecraft studies that the Jet Propulsion Laboratory (JPL) is conducting for the National Aeronautics and Space Administration (NASA). That study's NASA-directed goal is to reduce the spacecraft mass from its baseline value of 166 kg to ~110 kg, which implies a mass goal of less than 10 kg for a power source able to deliver 69 watts(e) at the end of the 9.2-year mission. In general, the Stirling options were found to be lighter than the thermoelectric options described in the preceding paper. But they are less mature, requiring more development, and entailing greater programmatic risk. The Stirling power system mass ranged from 7.3 kg (well below the 10-kg goal) for a non-redundant system to 11.3 kg for a redundant system able to maintain full power if one of its engines fails. In fact, the latter system could deliver as much as 115 watts(e) if desired by the mission planners. There are 5 copies in the file.

  10. Radioisotope Stirling Generator Options for Pluto Fast Flyby Mission

    SciTech Connect (OSTI)

    Schock, Alfred

    2012-01-19T23:59:59.000Z

    The preceding paper described conceptual designs and analytical results for five Radioisotope Thermoelectric Generator (RTG) options for the Pluto Fast Flyby (PFF) mission, and the present paper describes three Radioisotope Stirling Generator (RSG) options for the same mission. The RSG options are based on essentially the same radioisotope heat source modules used in previously flown RTGs and on designs and analyses of a 75-watt free-piston Stirling engine produced by Mechanical Technology Incorporated (MTI) for NASA's Lewis Research Center. The integrated system design options presented were generated in a Fairchild Space study sponsored by the Department of Energy's Office of Special Applications, in support of ongoing PFF mission and spacecraft studies that the Jet Propulsion Laboratory (JPL) is conducting for the National Aeronautics and Space Administration (NASA). That study's NASA-directed goal is to reduce the spacecraft mass from its baseline value of 166 kg to ~110 kg, which implies a mass goal of less than 10 kg for a power source able to deliver 69 watts(e) at the end of the 9.2-year mission. In general, the Stirling options were found to be lighter than the thermoelectric options described in the preceding paper. But they are less mature, requiring more development, and entailing greater programmatic risk. The Stirling power system mass ranged from 7.3 kg (well below the 10-kg goal) for a non-redundant system to 11.3 kg for a redundant system able to maintain full power if one of its engines fails. In fact, the latter system could deliver as much as 115 watts(e) if desired by the mission planners. There are 2 copies in the file.

  11. Recent Stirling engine loss - understanding results

    SciTech Connect (OSTI)

    Tew, R.C.; Thieme, L.G.; Dudenhoefer, J.E.

    1994-09-01T23:59:59.000Z

    For several years, the National Aeronautics and Space Administration and other US Government agencies have been funding experimental and analytical efforts to improve the understanding of Stirling thermodynamic losses. NASA`s objective is to improve Stirling engine design capability to support the development of new engines for space power. An overview of these efforts was last given at the 1988 IECEC. Recent results of this research are reviewed.

  12. Assessment of a multi-stage underwater vehicle concept using a fossil-fuel Stirling engine

    SciTech Connect (OSTI)

    Reader, G.T.; Potter, I.J. [Univ. of Calgary, Alberta (Canada). Dept. of Mechanical Engineering

    1995-12-31T23:59:59.000Z

    The Stirling Engine because of its inherent closed-cycle operation can be readily modified to work in an airless environment even if the primary source of energy is a fossil fuel. Thus, Stirling engines are well suited for use in the underwater environment and have been operated successfully in manned military submarines since the early 1980s. In recent years fossil fueled Stirling systems have been also proposed for use in small unmanned underwater vehicles (UUVs). However, in this case the need to carry an onboard oxygen supply in a very confined space has presented a number of design difficulties. These are identified in the paper. However, if the oxidant supply to the engine is provided by the membrane extraction of dissolved oxygen from seawater and/or disposable fuel/oxidant pods are used then the UUV Stirling system becomes more attractive. If this latter concept is extended to include multi-stage vehicles then it can be shown that fossil fueled Stirlings could also be put to effective use in long range-long endurance underwater vehicular operations.

  13. MODAL MU-CALCULI Julian Brad eld and Colin Stirling

    E-Print Network [OSTI]

    Stirling, Colin

    12 MODAL MU-CALCULI Julian Brad#12;eld and Colin Stirling 1 Introduction-calculus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 #12; 2 Julian Brad#12;eld and Colin Stirling 1 INTRODUCTION Modal mu-calculus is a logic used

  14. Stirling numbers of graphs, and the normal ordering

    E-Print Network [OSTI]

    Mayfield, John

    Stirling numbers of graphs, and the normal ordering problem Galvin earned his PhD in mathematics correlations in discrete random structures. The Stirling number of the second kind ${n \\brace k}$ counts

  15. MODAL MU-CALCULI Julian Bradfield and Colin Stirling

    E-Print Network [OSTI]

    Sattler, Ulrike

    12 MODAL MU-CALCULI Julian Bradfield and Colin Stirling 1 Introduction-calculus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 753 #12;722 Julian Bradfield and Colin Stirling 1 INTRODUCTION Modal mu-calculus is a logic used

  16. Stirling numbers of forests and cycles David Galvin

    E-Print Network [OSTI]

    Galvin, David

    Stirling numbers of forests and cycles David Galvin Do Trong Thanh June 15, 2012 Abstract For a graph G and a positive integer k, the graphical Stirling number S(G, k) is the number of partitions. If G is the empty graph on n vertices then S(G, k) reduces to S(n, k), the familiar Stirling number

  17. COMBINATORIAL INTERPRETATIONS OF THE JACOBI-STIRLING NUMBERS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    COMBINATORIAL INTERPRETATIONS OF THE JACOBI-STIRLING NUMBERS YOANN GELINEAU AND JIANG ZENG Abstract. The Jacobi-Stirling numbers of the first and second kinds were in- troduced in 2006 in the spectral theory and are polynomial refinements of the Legendre-Stirling numbers. Andrews and Littlejohn have recently given a com

  18. On Stirling numbers and Euler sums Victor Adamchik

    E-Print Network [OSTI]

    Adamchik, Victor

    On Stirling numbers and Euler sums Victor Adamchik Wolfram Research Inc., 100 Trade Center Dr of Stirling numbers of the first kind for non­integer values of their arguments. We discuss the analytic representations of Stirling numbers through harmonic numbers, the generalized hy­ pergeometric function

  19. PERFORMANCE OF A STIRLING ENGINE POWERED HEAT ACTIVATED HEAT PUMP

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    PERFORMANCE OF A STIRLING ENGINE POWERED HEAT ACTIVATED HEAT PUMP W. D. C. Richards and W. L. Auxer) which employs a natural gas fired Stirling engine to drive a Rankine cycle vapor compressor is presently by the heat pump effect. The Stirling engine/Rankine cycle refrigeration loop heat pump being developed would

  20. WYNN C. STIRLING Department of Electrical and Computer Engineering

    E-Print Network [OSTI]

    Wirthlin, Michael J.

    Vita WYNN C. STIRLING Department of Electrical and Computer Engineering 459 CB Brigham Young analysis and assessments. Publications Books [1] T. K. Moon and W. C. Stirling. Mathematical Methods and Algorithms in Signal Processing. Prentice-Hall, Upper Saddle River, NJ, 2000. [2] W. C. Stirling. Satisficing

  1. On Stirling numbers and Euler sums Victor Adamchik

    E-Print Network [OSTI]

    Adamchik, Victor

    On Stirling numbers and Euler sums Victor Adamchik Wolfram Research Inc., 100 Trade Center Dr of Stirling numbers of the rst kind for non-integer values of their arguments. We discuss the analytic representations of Stirling numbers through harmonic numbers, the generalized hy- pergeometric function

  2. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling Extended DILL: Digital Logic and Mathematics, University of Stirling, Scotland, November 1997. #12;Ji He and Kenneth J. Turner. Extended DILL, University of Stirling, Scotland, November 1997. Department of Computing Science and Mathematics University

  3. STIRLING'S FORMULA AND ITS EXTENSION FOR THE GAMMA FUNCTION

    E-Print Network [OSTI]

    Niculescu, Constantin P.

    STIRLING'S FORMULA AND ITS EXTENSION FOR THE GAMMA FUNCTION DORIN ERVIN DUTKAY, CONSTANTIN P. NICULESCU, AND FLORIN POPOVICI Abstract. We present new short proofs for both Stirling's formula and Stir formula of Stirling asserts that (1) n! p 2 nn+1=2 e n as n ! 1; in the sense that the ratio of the two

  4. On some arithmetic properties of polynomial expressions involving Stirling numbers

    E-Print Network [OSTI]

    Klazar, Martin

    On some arithmetic properties of polynomial expressions involving Stirling numbers of the second by the grant SEP-CONACYT 37259-E. 1 #12;Abstract Let S(n, k) be the classical Stirling numbers of the second. We give similar but more particular results on the more general Stirling-like numbers T(n, k). 2 #12

  5. Supporting Text Approximation of the Multinomial. Using Stirling's approximation

    E-Print Network [OSTI]

    Peterson, Carsten

    Supporting Text Approximation of the Multinomial. Using Stirling's approximation n! (n/e)n 2n! . [S12] To calculate B L (^n) limN BN L (^n), we apply Stirling's formula to N!, n0!, and n1!, which that r Stirling's formula

  6. Stirling numbers for complex arguments Bruce Richmond \\Lambda

    E-Print Network [OSTI]

    Merlini, Donatella

    Stirling numbers for complex arguments Bruce Richmond \\Lambda Department of Combinatorics.Merlini@dsi2.ing.unifi.it Abstract We define the Stirling numbers for complex values and obtain extensions of the Stirling numbers of the first and second kind ( h n k i and n n k o in a standard notation) to complex

  7. PLANE RECURSIVE TREES, STIRLING PERMUTATIONS AND AN URN MODEL

    E-Print Network [OSTI]

    Janson, Svante

    PLANE RECURSIVE TREES, STIRLING PERMUTATIONS AND AN URN MODEL SVANTE JANSON Abstract. We exploit a bijection between plane recursive trees and Stirling permutations; this yields the equivalence of some and plateaux in a random Stirling permutation. The proof uses an interesting generalized P??olya urn. 1

  8. PLANE RECURSIVE TREES, STIRLING PERMUTATIONS AND AN URN MODEL

    E-Print Network [OSTI]

    Janson, Svante

    PLANE RECURSIVE TREES, STIRLING PERMUTATIONS AND AN URN MODEL SVANTE JANSON Abstract. We exploit a bijection between plane recursive trees and Stirling permutations; this yields the equivalence of some and plateaux in a random Stirling permutation. The proof uses an interesting generalized P´olya urn. 1

  9. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Hammerton, James

    Department of Computing Science and Mathematics University of Stirling How do People want;#12;Department of Computing Science and Mathematics University of Stirling How do People want to Control their Home? Claire Maternaghan Department of Computing Science and Mathematics University of Stirling

  10. ON STIRLING NUMBERS FOR COMPLEX ARGUMENTS AND HANKEL CONTOURS

    E-Print Network [OSTI]

    Prodinger, Helmut

    ON STIRLING NUMBERS FOR COMPLEX ARGUMENTS AND HANKEL CONTOURS PHILIPPE FLAJOLET AND HELMUT of Stirling numbers for unrestricted complex values of their arguments. Many classical identities survive such an extension. 1. Introduction Richmond and Merlini have introduced in [5] an extension of Stirling's subset

  11. Physics 116A Winter 2011 The generalized Stirling series

    E-Print Network [OSTI]

    California at Santa Cruz, University of

    Physics 116A Winter 2011 The generalized Stirling series In these notes, a generalization of the asymptotic Stirling series for the logarithm of the Gamma function is derived. This generalization is then used to examine the behavior of (x + iy) as |y| . 1. Derivation of the generalized Stirling series We

  12. Department of Computing Science and Mathematics University of Stirling

    E-Print Network [OSTI]

    Turner, Ken

    Department of Computing Science and Mathematics University of Stirling The ACCENT Policy Wizard;#12;Department of Computing Science and Mathematics University of Stirling The ACCENT Policy Wizard Kenneth J. Turner and Gavin A. Campbell Department of Computing Science and Mathematics University of Stirling

  13. Physics 116A Winter 2011 The generalized Stirling series

    E-Print Network [OSTI]

    California at Santa Cruz, University of

    Physics 116A Winter 2011 The generalized Stirling series In these notes, a generalization of the asymptotic Stirling series for the logarithm of the Gamma function is derived. This generalization is then used to examine the behavior of #(x + iy) as |y| ##. 1. Derivation of the generalized Stirling series

  14. Evolutionary Ecology Research, 2001, 3: 157177 2001 Gray Stirling

    E-Print Network [OSTI]

    Jensen, Shane T.

    Evolutionary Ecology Research, 2001, 3: 157­177 © 2001 Gray Stirling Does a negative genetic Stirling,1 * Daphne J. Fairbairn,2 Shane Jensen3 and Derek A. Roff1 1 Department of Biology, Mc-off, phenotypic costs. * Address all correspondence to Gray Stirling, Department of Biology, McGill University

  15. Modulated power-law behaviour in Stirling's approximation

    E-Print Network [OSTI]

    Hatton, Les

    Modulated power-law behaviour in Stirling's approximation Les Hatton CISM, University of Kingston. This argument used Stirling's approximation which limits its relevance to larger component sizes. Although power to broaden Stirling's approximation to see if it corresponds with the departures from power-law observed

  16. Developments Towards a Liquid Piston Stirling Engine Tracking # 132055

    E-Print Network [OSTI]

    Van de Ven, James D.

    Developments Towards a Liquid Piston Stirling Engine Tracking # 132055 Paper #5635 James D. Van de 01609 USA The Stirling engine possesses numerous natural benefits such as functioning from any heat source, quiet operation, and high theoretical efficiency. The limited success of Stirling engines has

  17. GENERALIZED STIRLING PERMUTATIONS, FAMILIES OF INCREASING TREES AND URN MODELS

    E-Print Network [OSTI]

    Janson, Svante

    GENERALIZED STIRLING PERMUTATIONS, FAMILIES OF INCREASING TREES AND URN MODELS SVANTE JANSON and descents in the class of Stirling permutations, introduced by Gessel and Stanley [14]. Recently, Janson [18] showed the connection between Stirling permutations and plane recursive trees and proved a joint nor- mal

  18. Simulational nanoengineering: Molecular dynamics implementation of an atomistic Stirling engine

    E-Print Network [OSTI]

    Rapaport, Dennis C.

    Simulational nanoengineering: Molecular dynamics implementation of an atomistic Stirling engine D 2009; published 30 April 2009 A nanoscale-sized Stirling engine with an atomistic working fluid has s : 02.70.Ns, 05.70.Ln, 47.61. k The Stirling engine, an external combustion engine in- vented almost two

  19. 1 | P a g e University Of Stirling: Applicant Guide

    E-Print Network [OSTI]

    Little, Tony

    1 | P a g e University Of Stirling: Applicant Guide This guide provides an introduction on how to complete and submit an application for jobs advertised on the Jobs at Stirling page of the University of Stirling website. Where are jobs advertised? All current vacancies at the University are listed at www

  20. Analytical model for Stirling cycle machine design

    E-Print Network [OSTI]

    Formosa, Fabien; 10.1016/j.enconman.2010.02.010

    2013-01-01T23:59:59.000Z

    In order to study further the promising free piston Stirling engine architecture, there is a need of an analytical thermodynamic model which could be used in a dynamical analysis for preliminary design. To aim at more realistic values, the models have to take into account the heat losses and irreversibilities on the engine. An analytical model which encompasses the critical flaws of the regenerator and furthermore the heat exchangers effectivenesses has been developed. This model has been validated using the whole range of the experimental data available from the General Motor GPU-3 Stirling engine prototype. The effects of the technological and operating parameters on Stirling engine performance have been investigated. In addition to the regenerator influence, the effect of the cooler effectiveness is underlined.

  1. Alternative fuel capabilities of the Mod II Stirling vehicle

    SciTech Connect (OSTI)

    Grandin, A.W.; Ernst, W.D.

    1988-01-01T23:59:59.000Z

    The Stirling engine's characteristics make it a prime candidate for both multifuel and alternative fuel uses. In this paper, the relevant engine characteristics of the Mod II Stirling engine are examined, including the external heat system and basic operation. Adaptation of the Stirling to multifuel operation is addressed, and its experience with alternative fuels in automotive applications is summarized. The results of the U.S. Air Force review of the Stirling's multifuel capability are described, and the Stirling's advantages with liquid, gaseous, and solid fuels are discussed.

  2. Condensate and final-state effects in superfluid 4 R. T. Azuah* and W. G. Stirling

    E-Print Network [OSTI]

    Glyde, Henry R.

    Condensate and final-state effects in superfluid 4 He R. T. Azuah* and W. G. Stirling Department unexpected, given that kT is much less than the zero-point energy, the data requires that a new contribution system is condensed into a single atomic state has recently been observed in trapped, dilute gases

  3. Stirling engine sensitivity to fuel characteristics

    SciTech Connect (OSTI)

    Evers, L.W.; Fleming, R.D.

    1984-08-01T23:59:59.000Z

    A Stirling engine was tested to determine the influence of fuel properties on various aspects of engine performance. In order to evaluate the sensitivity of the various operating parameters to the influence of fuel, three different distillation ranges of fuel were selected. Generally, the results indicated that the Stirling engine efficiency was not sensitive to the type of fuel. The emissions, though low, were influenced by the fuel type. The carbon monoxide emissions were lowest for gasoline. Gasoline also produced the lowest hydrocarbon emissions, while diesel fuel produced the greatest.

  4. A compendium of solar dish/Stirling technology

    SciTech Connect (OSTI)

    Stine, W.B. [California State Polytechnic Univ., Pomona, CA (United States). Dept. of Mechanical Engineering; Diver, R.B. [Sandia National Labs., Albuquerque, NM (United States)

    1994-01-01T23:59:59.000Z

    This report surveys the emerging dish/Stirling technology. It documents -- using consistent terminology the design characteristics of dish concentrators, receivers, and Stirling engines applicable to solar electric power generation. Development status and operating experience for each system and an overview of dish/Stirling technology are also presented. This report enables comparisons of concentrator, receiver, and engine technologies. Specifications and performance data are presented on systems and on components that are in use or that could be used in dish/Stirling systems. This report is organized into two parts: The first part (Chapters 1 through 4) provides an overview of dish/Stirling technology -- the dish/ Stirling components (concentrator, receiver, and engine/alternator), current technology, basic theory, and technology development. The second part (Chapters 5 through 7) provides a detailed survey of the existing dish/Stirling concentrators, receivers, and engine/alternators.

  5. Proceedings of the 25th intersociety energy conversion engineering conference

    SciTech Connect (OSTI)

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

    1990-01-01T23:59:59.000Z

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

  6. Testing of a Stirling cycle cooler

    SciTech Connect (OSTI)

    Chen, F.C.; Keshock, E.G.; Murphy, R.W.

    1988-09-01T23:59:59.000Z

    Stirling cycle coolers have long been used as low temperature refrigeration devices. They are relatively compact, reliable, commercially available, and use helium as the working fluid. The Stirling cycle, in principle, can be used for household refrigeration and heat pumping applications as well. Currently, these applications are almost entirely provided by the vapor compression technology using chlorofluorocarbons (CFCs) as working fluids. It has been known that CFCs cause depletion of the ozone layer that protects the earth against harmful levels of ultraviolet radiation from the sun. A recent report of a ''hole'' in the ozone layer above Antarctica and of possible environmental and health consequences from ozone depletion aroused public attention. The urgent need to reduce the future used of CFCs should instigate investigation of non-CFC alternative technologies. The Stirling cooler technology, which does not use CFCs, could be a viable alternative. A laboratory test of the performance of a Stirling cooler is reported and its implications for household refrigeration are explored. 11 refs., 6 figs., 2 tabs.

  7. Double acting stirling engine piston ring

    DOE Patents [OSTI]

    Howarth, Roy B. (Clifton Park, NY)

    1986-01-01T23:59:59.000Z

    A piston ring design for a Stirling engine wherein the contact pressure between the piston and the cylinder is maintained at a uniform level, independent of engine conditions through a balancing of the pressure exerted upon the ring's surface and thereby allowing the contact pressure on the ring to be predetermined through the use of a preloaded expander ring.

  8. Two piston V-type Stirling engine

    DOE Patents [OSTI]

    Corey, John A. (North Troy, NY)

    1987-01-01T23:59:59.000Z

    A two piston Stirling engine which includes a heat exchanger arrangement placing the cooler and regenerator directly adjacent the compression space for minimal cold duct volume; a sealing arrangement which eliminates the need for piston seals, crossheads and piston rods; and a simplified power control system.

  9. Piston rod seal for a Stirling engine

    DOE Patents [OSTI]

    Shapiro, Wilbur (Schenectady, NY)

    1984-01-01T23:59:59.000Z

    In a piston rod seal for a Stirling engine, a hydrostatic bearing and differential pressure regulating valve are utilized to provide for a low pressure differential across a rubbing seal between the hydrogen and oil so as to reduce wear on the seal.

  10. ANALYSIS OF STATISTICS FOR GENERALIZED STIRLING PERMUTATIONS MARKUS KUBA AND ALOIS PANHOLZER

    E-Print Network [OSTI]

    Panholzer, Alois

    ANALYSIS OF STATISTICS FOR GENERALIZED STIRLING PERMUTATIONS MARKUS KUBA AND ALOIS PANHOLZER ABSTRACT. In this work we give a study of generalizations of Stirling permutations, a restricted class between such generalized Stirling permutations and various families of increasing trees extending

  11. FURTHER DEVELOPMENTS IN THE DESIGN OF A FREE-PISTON STIRLING ENGINE

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    NT-87-03-3 FURTHER DEVELOPMENTS IN THE DESIGN OF A FREE-PISTON STIRLING ENGINE HEAT PUMP (1986/1987), the development of an improved Stirling engine driver for the Free-Piston Stirling Engine

  12. Project Profile: Maintenance-Free Stirling Engine for High-Performance...

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

    Maintenance-Free Stirling Engine for High-Performance Dish CSP Project Profile: Maintenance-Free Stirling Engine for High-Performance Dish CSP Image of a prototype 30-kW Stirling...

  13. Design, fabrication, and testing of a sodium evaporator for the STM4-120 kinematic Stirling engine

    SciTech Connect (OSTI)

    Rawlinson, K.S.; Adkins, D.R.

    1995-05-01T23:59:59.000Z

    This report describes the development and testing of a compact heat-pipe heat exchanger kW(e) designed to transfer thermal energy from hot combustion gases to the heater tubes of a 25-kW(e) Stirling engine. In this system, sodium evaporates from a surface that is heated by a stream of hot gases. The liquid metal then condenses on the heater tubes of a Stirling engine, where energy is transferred to the engine`s helium working fluid. Tests on a prototype unit illustrated that a compact (8 cm {times} 13 cm {times} 16 cm) sodium evaporator can routinely transfer 15 kW(t) of energy at an operating vapor temperature of 760 C. Four of these prototype units were eventually used to power a 25-kW(e) Stirling engine system. Design details and test results from the prototype unit are presented in this report.

  14. Dish Stirling Solar-Receiver Combustor Test Program

    SciTech Connect (OSTI)

    Bankston, C.P.; Back, L.H.

    1981-08-15T23:59:59.000Z

    The overall objectives of the program were to evluate and verify the operational and energy transfer characteristics of the Dish Stirling Solar Receiver (DSSR) combustor/heat exchanger system. The DSSR is designed to operate with fossil fuel augmentation utilizing a swirl combustor and cross flow heat exchanger consisting of a single row of 48 closely spaced tubes that are curved into a conical shape. In the present study the performance of the combustor/heat exchanger system without a Stirling engine has been studied over a range of operating conditions and output levels using water as the working fluid. Results show that the combustor may be started under cold conditions, controlled safely, and operated at a constant air/fuel ratio (10% excess air) over the required range of firing rates. Furthermore, nondimensional heat transfer coefficients based on total heat transfer are plotted versus Reynolds number and compared with literature data taken for single rows of closely spaced tubes perpendicular to cross flow. The data show enhanced heat transfer for the present geometry and test conditions. Analysis of the results shows that the present system will meet specified thermal requirements, thus verifying the feasibility of the DSSR combustor design for final prototype fabrication.

  15. Integration of Radioisotope Heat Source with Stirling Engine and Cooler for Venus Internal-Structure Mission

    SciTech Connect (OSTI)

    Schock, Alfred

    1993-10-01T23:59:59.000Z

    The primary mission goal is to perform long-term seismic measurements on Venus, to study its largely unknown internal structure. The principal problem is that most payload components cannot long survive Venus's harsh environment, 90 bars at 500 degrees C. To meet the mission life goal, such components must be protected by a refrigerated payload bay. JPL Investigators have proposed a mission concept employing a lander with a spherical payload bay cooled to 25 degrees C by a Stirling cooler powered by a radioisotope-heated Sitrling engine. To support JPL's mission study, NASA/Lewis and MTI have proposed a conceptual design for a hydraulically coupled Stirling engine and cooler, and Fairchild Space - with support of the Department of Energy - has proposed a design and integration scheme for a suitable radioisotope heat source. The key integration problem is to devise a simple, light-weight, and reliable scheme for forcing the radioisotope decay heat to flow through the Stirling engine during operation on Venus, but to reject that heat to the external environment when the Stirling engine and cooler are not operating (e.g., during the cruise phase, when the landers are surrounded by heat shields needed for protection during subsequent entry into the Venusian atmosphere.) A design and integration scheme for achieving these goals, together with results of detailed thermal analyses, are described in this paper. There are 7 copies in the file.

  16. Rolling Thunder -- Integration of the Solo 161 Stirling engine with the CPG-460 solar concentrator at Ft. Huachuca

    SciTech Connect (OSTI)

    Diver, R.B.; Moss, T.A.; Goldberg, V.; Thomas, G.; Beaudet, A.

    1998-09-01T23:59:59.000Z

    Project Rolling Thunder is a dish/Stirling demonstration project at Ft. Huachuca, a US Army fort in southeastern Arizona (Huachuca means rolling thunder in Apache). It has been supported by the Strategic Environmental Research and Development Program (SERDP), a cooperative program between the Department of Defense (DoD) and the Department of Energy (DOE). As part of a 1992 SERDP project, Cummins Power Generation, Inc. (CPG) installed a CPG 7 kW(c) dish/Stirling system at the Joint Interoperability Test Command (JITC) in Ft. Huachuca, Arizona. The primary objective of the SERDP Dish/Stirling for DoD Applications project was to demonstrate a CPG 7-kW(c) dish/Stirling system at a military facility. Unfortunately, Cummins Engine Company decided to divest its solar operations. As a direct result of Ft. Huachuca`s interest in the Cummins dish/Stirling technology, Sandia explored the possibility of installing a SOLO 161 Stirling power conversion unit (PCU) on the Ft. Huachuca CPG-460. In January 1997, a decision was made to retrofit a SOLO 161 Stirling engine on the CPG-460 at Ft. Huachuca. Project Rolling Thunder. The SOLO 161 Demonstration at Ft. Huachuca has been a challenge. Although, the SOLO 161 PCU has operated nearly flawlessly and the CPG-460 has been, for the most part, a solid and reliable component, integration of the SOLO PCU with the CPG-460 has required significant attention. In this paper, the integration issues and technical approaches of project Rolling Thunder are presented. Lessons of the project are also discussed.

  17. An experimental study on a model Stirling engine car

    SciTech Connect (OSTI)

    Sohma, Yutaka; Wu, Chungming; Isshiki, Seita; Ushiyama, Izumi

    1999-07-01T23:59:59.000Z

    A Stirling engine is a mechanical device that operates on a closed regenerative thermodynamic cycle, with cyclic compression and expansion of the working fluid at different temperature levels. The flow is controlled by volume changes, and there exists a net conversion of the heat to work. Stirling engines are ideally suited to off-grid electric power generation because of their multi-fuel capability, potentially high efficiency and low noise. The first model Stirling Techno-rally was held in August 1997 for further promotion of the clean and quiet Stirling engine as one of the Centennial Anniversary events of JSME. In the race, more than one hundred cars competed for the time on a course of 13 meters length and 30 centimeters width. In Ashikaga Institute of Technology, a model Stirling engine car Ashikaga Gekkoh was made for this event. In this paper the authors report on this model car that won the championship of the Stirling Techno-rally.

  18. Ringbom-Stirling engine simulation and parametric study

    SciTech Connect (OSTI)

    Srinivasan, V.; Walker, G.; Fauvel, R.; Senft, J.R.

    1985-02-01T23:59:59.000Z

    A commercially available second-order isothermal Stirling engine simulation program was modified for operation on a Commodore Pet micro-computer. Modifications and extensions to the programme were introduced to facilitate simulation of the Ringbom-Stirling engine, a distinctive class of Stirling engines characterized by a free displacer and a crank controlled piston. Parametric studies were carried out using the modified simulation programme to assess the consequences of modifications to the principal design parameters. The 'standard case' selected for investigation was the single cylinder Ringbom-Stirling engine under development at the University of Calgary for the Transportation Development Centre, Transport Canada, Montreal.

  19. Dish/Stirling High-Performance Thermal Storage

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

    studies Goal: * Demonstrate the feasibility of significant thermal storage for dish Stirling systems to leverage their existing high performance to greater capacity * Demonstrate...

  20. Stirling engine with air working fluid

    SciTech Connect (OSTI)

    Corey, J. A.

    1985-08-06T23:59:59.000Z

    A Stirling engine capable of utilizing air as a working fluid which includes a compact heat exchange module which includes heating tube units, regenerator and cooler positioned about the combustion chamber. This arrangement has the purpose and effect of allowing the construction of an efficient, high-speed, high power-density engine without the use of difficult to seal light gases as working fluids.

  1. Stirling engine with air working fluid

    DOE Patents [OSTI]

    Corey, John A. (North Troy, NY)

    1985-01-01T23:59:59.000Z

    A Stirling engine capable of utilizing air as a working fluid which includes a compact heat exchange module which includes heating tube units, regenerator and cooler positioned about the combustion chamber. This arrangement has the purpose and effect of allowing the construction of an efficient, high-speed, high power-density engine without the use of difficult to seal light gases as working fluids.

  2. A new mathematical approach to the Stirling engine analysis

    SciTech Connect (OSTI)

    deCicco, A.

    1983-08-01T23:59:59.000Z

    A new approach to the theoretical analysis of the Stirling machine is presented. The mathematical model takes into account the phenomena occurring into all the main parts of the engine such as the expansion space, the heater, the regenerator, the cooler and the compression space as well. Energy, mass and momentum conservation differential equations are applied to each control volume, with the assumption the working fluid being regarded as a perfect, compressible gas, while the flow is unsteady, one dimensional, with friction and heat transfer. A set of algebraic equations is introduced, in order to consider the boundary conditions which express the constancy of total enthalpy and mass flow, and total pressure drop of the fluid flowing through the boundary sections of the control volumes.

  3. DEVELOPMENT OF THFEGENERAL ELECTRIC STIRLING ENGINE GAS HEAT PUMP

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    DEVELOPMENT OF THFEGENERAL ELECTRIC STIRLING ENGINE GAS HEAT PUMP R. C. Meier, Program Manager, Gas for the market- place of the 1980's. 1 7//AA -'6 1 #12;DEVELOPMENT OF THE GENERAL ELECTRIC STIRLING ENGINE GAS Heat Pump Program General Electric Company P. 0. Box 8555 Philadelphia, Pennsylvania 19101 FILE COPY DO

  4. On-Board Hydrogen Gas Production System For Stirling Engines

    SciTech Connect (OSTI)

    Johansson, Lennart N. (Ann Arbor, MI)

    2004-06-29T23:59:59.000Z

    A hydrogen production system for use in connection with Stirling engines. The production system generates hydrogen working gas and periodically supplies it to the Stirling engine as its working fluid in instances where loss of such working fluid occurs through usage through operation of the associated Stirling engine. The hydrogen gas may be generated by various techniques including electrolysis and stored by various means including the use of a metal hydride absorbing material. By controlling the temperature of the absorbing material, the stored hydrogen gas may be provided to the Stirling engine as needed. A hydrogen production system for use in connection with Stirling engines. The production system generates hydrogen working gas and periodically supplies it to the Stirling engine as its working fluid in instances where loss of such working fluid occurs through usage through operation of the associated Stirling engine. The hydrogen gas may be generated by various techniques including electrolysis and stored by various means including the use of a metal hydride absorbing material. By controlling the temperature of the absorbing material, the stored hydrogen gas may be provided to the Stirling engine as needed.

  5. Numerical study on optimal Stirling engine regenerator matrix designs taking into account the effects of matrix

    E-Print Network [OSTI]

    Numerical study on optimal Stirling engine regenerator matrix designs taking into account matrix design that improves the efficiency of a Stirling engine has been developed in a numerical study of the existing SM5 Stirling engine. A new, detailed, one-dimensional Stirling engine model that delivers results

  6. Performance of the Southern California Edison Company Stirling dish

    SciTech Connect (OSTI)

    Lopez, C.W. [Southern California Edison Co., Rosemead, CA (United States); Stone, K.W. [Mako Enterprises, Huntington Beach, CA (United States)

    1993-10-01T23:59:59.000Z

    McDonnell Douglas Astronautics Company (MDAC) and United Stirling AB of Sweden (USAB) formed a joint venture in 1982 to develop and produce a Stirling dish solar generating system. In this report, the six year development and testing program continued by the Southern California Edison Company (SCE) is described. Each Stirling dish module consists of a sun tracking dish concentrator developed by the MDAC and a Stirling engine driven power conversion unit (PCU) developed by USAB. The Stirling dish system demonstrated twice the peak and daily solar-to-electric conversion efficiency of any other system then under development. This system continues to set the performance standard for solar to electric systems being developed in the early 1990`s. Test data are presented and used to estimate the performance of a commercial system.

  7. Stirling engines for gas fired micro-cogen and cooling

    SciTech Connect (OSTI)

    Lane, N.W.; Beale, W.T. [Sunpower, Inc., Athens, OH (United States)

    1996-12-31T23:59:59.000Z

    This paper describes the design and performance of free-piston Stirling engine-alternators particularly suited for use as natural gas fired micro-cogen and cooling devices. Stirling based cogen systems offer significant potential advantages over internal combustion engines in efficiency, to maintain higher efficiencies at lower power levels than than combustion engines significantly expands the potential for micro-cogen. System cost reduction and electric prices higher than the U.S. national average will have a far greater effect on commercial success than any further increase in Stirling engine efficiency. There exist niche markets where Stirling engine efficiency. There exist niche markets where Stirling based cogen systems are competitive. Machines of this design are being considered for production in the near future as gas-fired units for combined heat and power in sufficiently large quantities to assure competitive prices for the final unit.

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

    SciTech Connect (OSTI)

    Laing, D.; Reusch, M. [Deutsche Forschungsanstalt fuer Luft- und Raumfahrt e.V., Stuttgart (Germany). Inst. fuer Technische Thermodynamik

    1997-12-31T23:59:59.000Z

    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.

  9. U. K. consortium Stirling engine programme

    SciTech Connect (OSTI)

    Rice, G.

    1982-08-01T23:59:59.000Z

    This paper covers the design and construction of a high pressure helium-charged two cylinder 20 kW Stirling engine to be operated in either the alpha or gamma configuration. The design includes a sodium heat pipe head. A joint University/ Industry Consortium was set up for the production of this research engine and the various contributions of the members are outlined in the paper. A dynamic test rig has been built to test regenerators and the paper illustrates the unique feature of this rig which enables measurement of the enthalpy loss through the regenerator and its effectiveness.

  10. Double acting stirling engine phase control

    DOE Patents [OSTI]

    Berchowitz, David M. (Scotia, NY)

    1983-01-01T23:59:59.000Z

    A mechanical device for effecting a phase change between the expansion and compression volumes of a double-acting Stirling engine uses helical elements which produce opposite rotation of a pair of crankpins when a control rod is moved, so the phase between two pairs of pistons is changed by +.psi. and the phase between the other two pairs of pistons is changed by -.psi.. The phase can change beyond .psi.=90.degree. at which regenerative braking and then reversal of engine rotation occurs.

  11. 5.4 Stirling Numbers When counting various types of functions from 2.1, we quickly discovered that

    E-Print Network [OSTI]

    DeMaio, Joe

    5.4 Stirling Numbers When counting various types of functions from 2.1, we quickly discovered as the Stirling number of the second kind. There are two types of Stirling numbers. We will initially examine Stirling numbers of the second kind due to the fact that they occur more frequently. The Stirling number

  12. Stirling engine with integrated gas combustor

    SciTech Connect (OSTI)

    Meijer, R.J.

    1990-12-18T23:59:59.000Z

    This paper discusses a Stirling engine. It comprises heat transfer stacks having a cooler, regenerator and heat exchanger stacked end-to-end with a working cylinder adjacent each of the stacks and connected therewith by a hot connecting duct, the heat exchangers including an annular cluster of circumferentially spaced tubes extending from the regenerator in a substantially axial direction to an annular manifold axially spaced from the regenerator such that at any given time during operation of the Stirling engine working fluid in the tubes is flowing in a single axial direction through the heat exchanger, a combustion chamber on an end of each of the stacks having a gas flow outlet communicating with the interior of the heat exchanger tube cluster, air inlets for each of the combustion chambers for allowing air to enter the interior of the chambers, and a nozzle within the combustion chambers for introducing a combustible fuel within the combustion chambers, whereby the combustible fuel and air combust in the combustion chambers and generate hot gases which pass between the tubes applying heat to the heat exchanger.

  13. Regenerator optimization for Stirling cycle refrigeration

    SciTech Connect (OSTI)

    Colgate, S.A. [Los Alamos National Lab., NM (United States); Petschek, A.G. [New Mexico Tech, Socorro, NM (United States)

    1993-08-01T23:59:59.000Z

    A cryogenic regenerator for a Stirling cycle is designed using a fractional loss or entropy gain as the criterion of performance. The gas losses are treated separately from heat storage medium losses. For the optimum channel flow nonturbulent design, the maximization of heat transfer from the gas to the wall and the minimization of entropy production by friction leads to a gas flow velocity criterion of sound speed times loss fraction. This velocity with a given frequency leads to a Stirling cycle dead volume ratio and consequently a channel of specified length and width. The thermal properties of the channel wall must then accommodate this cyclic heat flow without substantially increasing the loss fraction. It is found that stainless steel or plastics are adequate for 30 to 300 K, but that lower temperature stages 4 to 30 K require either a special lead alloy of moderate conductivity or a segmented anisotropic construction of alternate highly conducting lead layers and alternate insulating glass or epoxy fiber glass spacers. An overall efficiency of {congruent} 50% of Carnot is predicted at a frequency of 30 Hz and a pressure of one atmosphere.

  14. Linear hydraulic drive system for a Stirling engine

    DOE Patents [OSTI]

    Walsh, Michael M. (Schenectady, NY)

    1984-02-21T23:59:59.000Z

    A hydraulic drive system operating from the periodic pressure wave produced by a Stirling engine along a first axis thereof and effecting transfer of power from the Stirling engine to a load apparatus therefor and wherein the movable, or working member of the load apparatus is reciprocatingly driven along an axis substantially at right angles to the first axis to achieve an arrangement of a Stirling engine and load apparatus assembly which is much shorter and the components of the load apparatus more readily accessible.

  15. Thermoacoustic refrigerators and engines comprising cascading stirling thermodynamic units

    SciTech Connect (OSTI)

    Backhaus, Scott; Swift, Greg

    2013-06-25T23:59:59.000Z

    The present invention includes a thermoacoustic assembly and method for improved efficiency. The assembly has a first stage Stirling thermal unit comprising a main ambient heat exchanger, a regenerator and at least one additional heat exchanger. The first stage Stirling thermal unit is serially coupled to a first end of a quarter wavelength long coupling tube. A second stage Stirling thermal unit comprising a main ambient heat exchanger, a regenerator, and at least one additional heat exchanger, is serially coupled to a second end of the quarter wavelength long coupling tube.

  16. Jacobi-Stirling polynomials and $P$-partitions

    E-Print Network [OSTI]

    Gessel, Ira M; Zeng, Jiang

    2012-01-01T23:59:59.000Z

    We investigate the diagonal generating function of the Jacobi-Stirling numbers of the second kind $ \\JS(n+k,n;z)$ by generalizing the analogous results for the Stirling and Legendre-Stirling numbers. More precisely, letting $\\JS(n+k,n;z)=p_{k,0}(n)+p_{k,1}(n)z+...+p_{k,k}(n)z^k$, we show that $(1-t)^{3k-i+1}\\sum_{n\\geq0}p_{k,i}(n)t^n$ is a polynomial in $t$ with nonnegative integral coefficients and provide combinatorial interpretations of the coefficients by using Stanley's theory of $P$-partitions.

  17. Effect of Inert Cover Gas on Performance of Radioisotope Stirling Space Power System

    SciTech Connect (OSTI)

    Carpenter, Robert; Kumar, V; Ore, C; Schock, Alfred

    2001-01-01T23:59:59.000Z

    This paper describes an updated Orbital design of a radioisotope Stirling power system and its predicted performance at the beginning and end of a six-year mission to the Jovian moon Europa. The design is based on General Purpose Heat Source (GPHS) modules identical to those previously developed and safety-qualified by the Department of Energy (DOE) which were successfully launched to Jupiter and Saturn by the Jet Propulsion Laboratory (JPL). In each generator, the heat produced by the decay of the Pu-238 isotope is converted to electric power by two free-piston Stirling engines and linear alternators developed by Stirling Technology Company (STC), and their rejected waste heat is transported to radiators by heat pipes. The principal difference between the proposed system design and previous Orbital designs (Or et al. 2000) is the thermal insulation between the heat source and the generator's housing. Previous designs had employed multifoil insulation, whereas the design described here employs Min-K-1800 thermal insulation. Such insulation had been successfully used by Teledyne and GE in earlier RTGs (Radioisotope Thermoelectric Generators). Although Min-K is a much poorer insulator than multifoil in vacuum and requires a substantially greater thickness for equivalent performance, it offers compensating advantages. Specifically it makes it possible to adjust the generator's BOM temperatures by filling its interior volume with inert cover gas. This makes it possible to meet the generator's BOM and EOM performance goals without exceeding its allowable temperature at the beginning of the mission.

  18. Combinatorial Interpretation of Unsigned Stirling and Lah Numbers* Marko Petkov~seky and Toma~z Pisanskiz

    E-Print Network [OSTI]

    Petkovsek, Marko

    Combinatorial Interpretation of Unsigned Stirling and Lah Numbers of unsigned Stirling and Lah numbers is reexamine* *d in connection with ordi- nary powers, rising [2]. In particular, the Karam* *ata notation [3] for the unsigned Stirling numbers is extended

  19. Games and Modal Mu-Calculus Colin Stirling

    E-Print Network [OSTI]

    Stirling, Colin

    of authors has noted that it is essentially game theoretic 3, 18, 16] (and 15] extends this description, Edinburgh EH9 3JZ, UK, email: cps@dcs.ed.ac.uk #12;112 Colin Stirling checking algorithms: furthermore

  20. Microsoft PowerPoint - Application of Stirling Cycle Generators...

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

    Stirling Cycle Generators in Production Generators in Production Operations B. Dotson, SPE, BP America Production Co. J. Rochelle, SPE, US DOE RMOTC L. Madden, WhisperGen Ltd. , p...

  1. Bernoulli-like polynomials associated with Stirling Numbers

    E-Print Network [OSTI]

    Carl M. Bender; Dorje C. Brody; Bernhard K. Meister

    2005-09-05T23:59:59.000Z

    The Stirling numbers of the first kind can be represented in terms of a new class of polynomials that are closely related to the Bernoulli polynomials. Recursion relations for these polynomials are given.

  2. The pumping ring as a Stirling Engine rod seal

    SciTech Connect (OSTI)

    Short, M.G.

    1983-08-01T23:59:59.000Z

    The rod seal performs a demanding role in a Stirling cycle machine having to restrict both gas and oil leakage to minimal levels whilst operating at high pressures and sliding speeds. This paper describes the continuation of a development programme carried out at the Royal Naval Engineering College, Manadon as part of the UK. Stirling Engine Consortium. The results of tests using a back to back pumping ring configuration are presented.

  3. The Zimmerman-Stirling cryogenic cooler

    SciTech Connect (OSTI)

    Clarke, M.A.; Amiri-Samokey, H.; Taylor, D.R.

    1983-08-01T23:59:59.000Z

    The development of low power, superconductive, electronic components has led to the requirement for compact, low input, refrigeration devices generally called cryogenic coolers. The use of a reversed Stirling cycle has been reported, using helium as the working fluid and a simple form of gap regeneration, to achieve temperatures of 9K at high efficiency. As an undergraduate student project, a test rig was developed at RNEC Manadon to investigate the construction of such a device with its associated drive mechanism, using the basic dimensions available from the literature. The extremely low temperatures have not been produced when the rig is started up from room temperature with no precooling but some success has been found in tests using air as the working fluid.

  4. Stirling engine with one adiabatic cylinder

    SciTech Connect (OSTI)

    West, C.D.

    1982-03-01T23:59:59.000Z

    It is shown that integration around the P-V loop of a Stirling-like cycle with an adiabatic expansion or compression space is possible through careful application of the ideal gas laws. The result is a set of closed-form solutions for the work output, work input, and efficiency for ideal gases. Previous analyses have yielded closed-form solutions only for machines in which all spaces behave isothermally, or that have other limitations that simplify the arithmetic but omit important aspects of real machines. The results of this analysis, although still far removed from the exact behavior of real, practical engines, yield important insights into the effects observed in computer models and experimental machines. These results are especially illuminating for machines intended to operate with fairly small temperature differences. Heat pumps and low-technology solar-powered engines might be included in this category.

  5. Stirling engine control mechanism and method

    DOE Patents [OSTI]

    Dineen, John J. (Durham, NH)

    1983-01-01T23:59:59.000Z

    A reciprocating-to-rotating motion conversion and power control device for a Stirling engine includes a hub mounted on an offset portion of the output shaft for rotation relative to the shaft and for sliding motion therealong which causes the hub to tilt relative to the axis of rotation of the shaft. This changes the angle of inclination of the hub relative to the shaft axis and changes the axial stroke of a set of arms connected to the hub and nutating therewith. A hydraulic actuating mechanism is connected to the hub for moving its axial position along the shaft. A balancing wheel is linked to the hub and changes its angle of inclination as the angle of inclination of the hub changes to maintain the mechanism in perfect balance throughout its range of motion.

  6. JOURNAL OF COMBINATORIAL THEORY, SeriesA 24, 24-33 (1978) Stirling Polynomials

    E-Print Network [OSTI]

    1978-01-01T23:59:59.000Z

    JOURNAL OF COMBINATORIAL THEORY, SeriesA 24, 24-33 (1978) Stirling Polynomials IRA GESSEL of the polynomials fk(n) = ,S(n+ I?,n) and g&z) == (- l)k s(n, n - k), where s and s denote the Stirling numbers. ,S(q k) is a Stirling number of the second kind, and C(IZ,k) is related to the Stirling numbers ~(a

  7. ON THE DIVISIBILITY BY 2 OF THE STIRLING NUMBERS OF THE SECOND KIND T. Lengyel

    E-Print Network [OSTI]

    Lengyel, Tamás

    ON THE DIVISIBILITY BY 2 OF THE STIRLING NUMBERS OF THE SECOND KIND characterize the divisibility by 2 of the Stirling number * *of the second kind, S(n, k), where n. (Here the independence follows from the periodicity of the Stirling numbers mod* *ulo any prime power

  8. Stirling Numbers of the Second Kind and Department of Mathematics and Statistics

    E-Print Network [OSTI]

    DeMaio, Joe

    Stirling Numbers of the Second Kind and Primality Joe DeMaio Department of Mathematics Touset stephen@touset.org April 21, 2008 Abstract A Stirling number of the second kind is a combinatorial function which yields interesting number theoretic properties with regard to primality. The Stirling number

  9. ON THE DIVISIBILITY BY 2 OF THE STIRLING NUMBERS OF THE SECOND KIND

    E-Print Network [OSTI]

    Lengyel, Tamás

    ON THE DIVISIBILITY BY 2 OF THE STIRLING NUMBERS OF THE SECOND KIND T* Lengyel Occidental College characterize the divisibility by 2 of the Stirling numbers of the second kind, S(n, k), where n independence follows from the periodicity of the Stirling numbers modulo any prime power.) For k > 5

  10. ON THE ORDER OF STIRLING NUMBERS AND ALTERNATING BINOMIAL COEFFICIENT SUMS

    E-Print Network [OSTI]

    Lengyel, Tamás

    ON THE ORDER OF STIRLING NUMBERS AND ALTERNATING BINOMIAL COEFFICIENT SUMS Ira M. Gessel \\Lambda=p is not an odd integer. Here S(n; k) denotes the Stirling number of the second kind; i.e., the number) denotes the Stirling number of the second kind, and n = a 2 q ; a is odd, and q is sufficiently large (for

  11. Stirling's Formula and Laplace's Method How to Put Your Calculus to Good Use

    E-Print Network [OSTI]

    Khoshnevisan, Davar

    Stirling's Formula and Laplace's Method OR How to Put Your Calculus to Good Use The Undergraduate.422786847 ? 1018 S(40) = 8.14217264483 ? 1047 S(100) = 9.32 ? 10157 S(400) = Error 2-a #12;Stirling's Formula (De History Stirling's formula was found by Abraham de Moivre and published in "Miscellenea Analyt- ica" 1730

  12. SYSTEM PERFORMANCE OF A STIRLING ENGINE POWERED HEAT ACTIVATED HEAT PUMP

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    AUG 1979 SYSTEM PERFORMANCE OF A STIRLING ENGINE POWERED HEAT ACTIVATED HEAT PUMP W. D. Richards W of the subsystem compo- nents, especially between the free piston Stirling engine and the free piston linear to measure the feasibility and viability of the concept as a product. As a result of this effort, a Stirling

  13. JACOBI-STIRLING POLYNOMIALS AND P-PARTITIONS IRA M. GESSEL, ZHICONG LIN, AND JIANG ZENG

    E-Print Network [OSTI]

    Gessel, Ira M.

    JACOBI-STIRLING POLYNOMIALS AND P-PARTITIONS IRA M. GESSEL, ZHICONG LIN, AND JIANG ZENG Abstract. We investigate the diagonal generating function of the Jacobi-Stirling num- bers of the second kind JS(n + k, n; z) by generalizing the analogous results for the Stir- ling and Legendre-Stirling

  14. A LUMPED-PARAMETER DYNAMIC MODEL OF A THERMAL REGENERATOR FOR FREE-PISTON STIRLING ENGINES

    E-Print Network [OSTI]

    Barth, Eric J.

    A LUMPED-PARAMETER DYNAMIC MODEL OF A THERMAL REGENERATOR FOR FREE-PISTON STIRLING ENGINES Mark the mass flow, piston dynamics, and control volume behavior inside a free-piston Stirling engine. A new model for a Stirling engine thermal regenerator that incorporates a dynamically changing temperature

  15. Partition lattice q-analogs related to q-Stirling Curtis Bennett

    E-Print Network [OSTI]

    Sagan, Bruce

    Partition lattice q-analogs related to q-Stirling numbers Curtis Bennett Department of Mathematics field, q-Stirling numbers AMS subject classification (1991): Primary 05A30; Secondary 05A18, 06A07. #12 of the first and second kind are just the q-Stirling numbers of the first and second kind, respectively. One

  16. Annihilating polynomials for quadratic forms and Stirling numbers of the second kind

    E-Print Network [OSTI]

    Annihilating polynomials for quadratic forms and Stirling numbers of the second kind Stefan De valuation of Stirling numbers of the second kind. 1 Introduction In 1937, Witt already observed out to be related to the Stirling numbers of the second kind. The result about the (torsion

  17. A Numerical Analysis of a Kinematic Stirling-Cycle Beat Pump for Space Conditioning Applications*

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    #12;A Numerical Analysis of a Kinematic Stirling-Cycle Beat Pump for Space Conditioning simulation was performed on a only recently been explored. 'To substantiate kinematic Stirling heat pump on a kinematic Stirling heat pump for third-order code. The effects of outdoor air space heating was made

  18. Multiphysics modeling of a micro-scale Stirling refrigeration system Dongzhi Guo a

    E-Print Network [OSTI]

    McGaughey, Alan

    Multiphysics modeling of a micro-scale Stirling refrigeration system Dongzhi Guo a , Alan J.H. Mc Accepted 2 July 2013 Available online Keywords: Stirling microcooler Regenerator Coefficient of performance of arrays of silicon MEMS cooling elements that operate on the Stirling cycle has been designed

  19. Context-free Grammars and Multivariate Stable Polynomials over Stirling Permutations

    E-Print Network [OSTI]

    Chen, Bill

    Context-free Grammars and Multivariate Stable Polynomials over Stirling Permutations William Y of some results of B´ona, Brenti, Janson, Kuba, and Panholzer concerning Stirling permutations. Let Bn(x) be the generating polynomials of the descent statistic over Legendre-Stirling permutations, and let Tn(x) = 2n Cn

  20. On partitions, surjections, and Stirling Peter Hilton, Jean Pedersen and Jurgen Stigter

    E-Print Network [OSTI]

    Chapman, Robin

    On partitions, surjections, and Stirling numbers Peter Hilton, Jean Pedersen and J¨urgen Stigter 1 a set of n-elements; and St(m, n), the Stirling number of the second kind, given by1 St(m, n) = 1 n! n r integer independent of m, which we call the Stirling factor of type (h, k). We do not calculate

  1. Annihilating polynomials for quadratic forms and Stirling numbers of the second kind

    E-Print Network [OSTI]

    Annihilating polynomials for quadratic forms and Stirling numbers of the second on the 2-adic valuation of Stirling numbers of the second kind. 1 Introduction In 1937, Witt obtaining a new lower bound for the 2-adic valuation of all Stirling numbers S(n, k) of the second kind

  2. On Path diagrams and Stirling permutations Institut fur Diskrete Mathematik und Geometrie

    E-Print Network [OSTI]

    Kuba, Markus

    On Path diagrams and Stirling permutations M. Kuba Institut f¨ur Diskrete Mathematik und Geometrie of this article is to extend the notion of local types to k-Stirling permutations, establish a relation diagrams. In the case of the classical Stirling permutations, we give an alternative continued fraction

  3. P On some properties of the series 1k=0knxk and the Stirling

    E-Print Network [OSTI]

    Lengyel, Tamás

    and the Stirling numbers of the second kind Tam'as Lengyel Mathematics Department P 1 Lengyel, T., On some properties of the series k=0knxk and the Stirling * *numbers. The proof is based on lower bounds on the multiplicities of fac* *tors of the Stirling number

  4. On Path diagrams and Stirling permutations Institut fur Diskrete Mathematik und Geometrie

    E-Print Network [OSTI]

    Kuba, Markus

    On Path diagrams and Stirling permutations M. Kuba Institut f¨ur Diskrete Mathematik und Geometrie is to introduce the notion of local types in k-Stirling permutations, to relate these local types with nodes types, Stirling permutations, Increasing trees, local types, formal power series 2000 Mathematics Subject

  5. Analyzing generalized Stirling permutations via relations to families of increasing trees and urn models

    E-Print Network [OSTI]

    Janson, Svante

    Analyzing generalized Stirling permutations via relations to families of increasing trees and urn-mail: kuba@geometrie.tuwien.ac.at, Alois.Panholzer@tuwien.ac.at) Abstract. Stirling permutations are a class of multipermutations introduced by Gessel and Stanley. We consider Stirling permutations and generalizations

  6. University of Stirling PhD studentship in Diabetes and Pre-hospital Emergency Care

    E-Print Network [OSTI]

    Little, Tony

    University of Stirling PhD studentship in Diabetes and Pre-hospital Emergency Care Background Making. The Decision Making Programme is based within the University of Stirling and includes research of collaboration with academic partners, within the University of Stirling and beyond. NMAHP Research Unit

  7. Mathematical Model of an Air-Filled Alpha Stirling Refrigerator Patrick McFarlane,1, a)

    E-Print Network [OSTI]

    Sen, Mihir

    Mathematical Model of an Air-Filled Alpha Stirling Refrigerator Patrick McFarlane,1, a) Fabio for an alpha Stirling refrigerator with air as the working fluid and will be useful in optimizing Stirling refrigeration systems. a) Electronic mail: pmcfarla@nd.edu b) Electronic mail: Fabio.Semperlotti.1

  8. Automated Proofs for Some Stirling Number Identities Manuel Kauers # and Carsten Schneider +

    E-Print Network [OSTI]

    Schneider, Carsten

    Automated Proofs for Some Stirling Number Identities Manuel Kauers # and Carsten Schneider­)Eulerian numbers that were obtained by combining a recent summation algorithm for Stirling number identities)S(n, k) where h(m, n, k) is a hypergeometric term and S(n, k) are, e.g., Stirling numbers or Eule­ rian

  9. 2-ADIC PARTIAL STIRLING FUNCTIONS AND THEIR ZEROS DONALD M. DAVIS

    E-Print Network [OSTI]

    Davis, Donald M.

    2-ADIC PARTIAL STIRLING FUNCTIONS AND THEIR ZEROS DONALD M. DAVIS Abstract. Let Pn(x) = 1 n! n 2i+1 Stirling function. We show that (-1)n+1 Pn is the only 2-adically continuous approximation to S(x, n), the Stirling number of the second kind. We present extensive information about the zeros of Pn, for which

  10. Photograph Norman McLaren Archive, University of Stirling Film Studies

    E-Print Network [OSTI]

    Little, Tony

    Photograph Norman McLaren Archive, University of Stirling MLitt Film Studies: Theory and Practice in Film Studies: Theory and Practice at the University of Stirling aims to equip students with both of the unique facilities on the Stirling campus, students will also make use of the University Archives - home

  11. Combinatorial Interpretation of Unsigned Stirling and Lah Numbers \\Lambda Marko Petkovsek y and Tomaz Pisanski z

    E-Print Network [OSTI]

    Petkovsek, Marko

    Combinatorial Interpretation of Unsigned Stirling and Lah Numbers \\Lambda Marko PetkovŸsek y, 2002 Abstract The combinatorial role of unsigned Stirling and Lah numbers is reexamined in connection]. In particular, the Karamata notation [3] for the unsigned Stirling numbers is extended to the unsigned Lah

  12. Selection, structure and the heritability of behaviour D. G. STIRLING,* D. RE ALE* & D. A. ROFF

    E-Print Network [OSTI]

    Rale, Denis

    Selection, structure and the heritability of behaviour D. G. STIRLING,* D. RE ALE* & D. A. ROFF their independent direct effects on behavioural heritability. Correspondence: D. Gray Stirling, Department; Fax: 514 398 5069; e-mail: stirling@bio1.lan.mcgill.ca J . E V O L . B I O L . 1 5 ( 2 0 0 2 ) 2 7 7

  13. ON THE ORDER OF STIRLING NUMBERS AND ALTERNATING BINOMIAL COEFFICIENT SUMS

    E-Print Network [OSTI]

    Lengyel, Tamás

    ON THE ORDER OF STIRLING NUMBERS AND ALTERNATING BINOMIAL COEFFICIENT SUMS Ira M. Gessel is sufficiently large and kip is not an odd integer. Here S(n, k) denotes the Stirling num- ber of the second kindStirling number of the second kind, and n = alq , a is odd, and q

  14. Two PhD Studentships available UNIVERSITY OF STIRLING, SCHOOL OF APPLIED SOCIAL SCIENCE

    E-Print Network [OSTI]

    Little, Tony

    Two PhD Studentships available UNIVERSITY OF STIRLING, SCHOOL OF APPLIED SOCIAL SCIENCE ESRC, University of Stirling invite applications from prospective PhD students for an ESRC/Scottish Government Kirstein Rummery at Stirling University and Professor Ailsa McKay at Glasgow Caledonian Univerity

  15. THE LEGENDRE-STIRLING NUMBERS G. E. ANDREWS, W. GAWRONSKI, AND L. L. LITTLEJOHN

    E-Print Network [OSTI]

    THE LEGENDRE-STIRLING NUMBERS G. E. ANDREWS, W. GAWRONSKI, AND L. L. LITTLEJOHN Abstract. The Legendre-Stirling numbers are the coe¢ cients in the integral Lagrangian sym- metric powers Stirling numbers of the second kind which play a similar role in the integral powers of the classical

  16. From Sustainability to Transformation: dynamics and diversity in reflexive governance of vulnerability, Andy Stirling

    E-Print Network [OSTI]

    Sussex, University of

    of vulnerability, Andy Stirling From "Broadening Out" Appraisal to "Opening Up" Commitments This chapter turns our-technical choice (Stirling, 2008a). Organizational, cultural, political, and economic forces structure our implications (Stirling, 2008b). In this way, we can extend attention to alternative trajectories reflecting

  17. Annihilating polynomials for quadratic forms and Stirling numbers of the second kind

    E-Print Network [OSTI]

    Annihilating polynomials for quadratic forms and Stirling numbers of the second kind Stefan De valuation of Stirling numbers of the second kind. 1 Introduction In 1937, Witt already observed of sums of m­fold Pfis­ ter forms and the coe#cients that appear turn out to be related to the Stirling

  18. Integration of analysis and experiment for Stirling cycle processes: Part 1, Gas spring hysteresis loss

    SciTech Connect (OSTI)

    Kornhauser, A.A.; Smith, J.L. Jr.

    1988-01-01T23:59:59.000Z

    Heat transfer-related hysteresis loss can be an important factor in the performance of Stirling and other reciprocating machines. Analytical predictions of hysteresis loss have been available to designers, but until now they were not experimentally verified. Hysteresis loss was measured in a piston-cylinder gas spring over a range of speeds, pressures, gases, bore/stroke ratios, volume ratios, and internal extended surface geometries. An analysis of a simplified one-dimensional energy equation produced non-dimensional parameters that were used to correlate the experimental data. The loss expression from the analysis was adjusted to fit the correlated data. 7 refs., 8 figs.

  19. Discrete Mathematics and Theoretical Computer Science DMTCS vol. 12:2, 2010, 167184 Asymptotics of the Stirling numbers of the

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of the Stirling numbers of the first kind revisited: A saddle point approach Guy Louchard Universit´e Libre de the generating function of the Stirling numbers of the first kind » n j ­ and Cauchy's integral formula ­ on . Keywords: Stirling numbers, saddle point method. To Philippe 1 Introduction Let n j be the Stirling number

  20. University of Stirling PhD Studentship in Informing Behaviour Change during pregnancy using design and image based principles

    E-Print Network [OSTI]

    Little, Tony

    University of Stirling PhD Studentship in Informing Behaviour Change during pregnancy using design.nmahp.gcal.ac.uk The PhD will be registered within the University of Stirling's School of Nursing, Midwifery and Health electronically or returned by post to the Graduate Admissions Office, University of Stirling, Stirling, FK9 4LA

  1. This article was downloaded by: [University of Stirling Library] On: 13 June 2012, At: 06:31

    E-Print Network [OSTI]

    Little, Tony

    This article was downloaded by: [University of Stirling Library] On: 13 June 2012, At: 06 of Stirling, Stirling, UK Available online: 15 May 2012 To cite this article: Lisa A. Parr, Jessica Taubert in connection with or arising out of the use of this material. Downloadedby[UniversityofStirlingLibrary]at06

  2. A self-circulating heat exchanger for use in stirling and thermoacoustic-stirling engines

    SciTech Connect (OSTI)

    Backhaus, S. N. (Scott N.); Reid, R. S. (Robert Stowers)

    2004-01-01T23:59:59.000Z

    A major technical hurdle to the implementation of large Stirling engines or thermoacoustic engines is the reliability, performance, and manufacturability of the hot heat exchanger that brings high-temperature heat into the engine. Unlike power conversion devices that utilize steady flow, the oscillatory nature of the flow in Stirling and thermoacoustic engines restricts the length of a traditional hot heat exchanger to a peak-to-peak gas displacement, which is usually around 0.2 meters or less. To overcome this restriction, a new hot heat exchanger has been devised that uses a fluid diode in a looped pipe, which is resonantly driven by the oscillating gas pressure in the engine itself, to circulate the engine's working fluid around the loop. Instead of thousands of short, intricately interwoven passages that must be individually sealed, this new design consists of a few pipes that are typically 10 meters long. This revolutionary approach eliminates thousands of hermetic joints, pumps the engine's working fluid to and from a remote heat source without using moving parts, and does so without compromising on heat transfer surface area. Test data on a prototype loop integrated with a 1-kW thermoacoustic engine will be presented.

  3. The ECA indirectly heated Stirling engine

    SciTech Connect (OSTI)

    Carlqvist, S.G.; Darche, M.; Ducroux, P.

    1983-08-01T23:59:59.000Z

    At the beginning of the 1980s the ECA Company designed and manufactured the first French Stirling engine, partially funded by the French government. The ECA engine has several design features of special interest: indirect heating by sodium heat pipes, cylinder block with four double-acting cylinders in line with a single crankshaft, four identical and demountable heat exchanger modules, piston rod seals with recuperation of leakage losses by means of four integrated rod pumps and with hermetic gas and oil seals using four roll socks, and power control by means of three gas valves and a 3.5-MPa helium bottle. The ECA engine ran for the first time and at the first attempt at the end of June 1982 and rapidly delivered a power of 5 kW at reduced pressure. Further testing of this 4-by 113-cm3 engine is under way to obtain a nominal power of 12 kW and an efficiency of 36% (heat to shaft power) with a very simplified design.

  4. Compact Stirling cooling of astronomical detectors

    E-Print Network [OSTI]

    Raskin, Gert; Pessemier, Wim; Padilla, Jesus Perez; Vandersteen, Jeroen

    2013-01-01T23:59:59.000Z

    MAIA, a three-channel imager targeting fast cadence photometry, was recently installed on the Mercator telescope (La Palma, Spain). This instrument observes a 9.4 x 14.1 arcmin field of view simultaneously in three color bands ($u$, $g$ and $r$), using three of the largest (un-) available frame-transfer CCDs, namely the 2k x 6k CCD42-C0 from e2v. As these detectors are housed in three separate cryostats, compact cooling devices are required that offer sufficient power to cool the large chips to a temperature of 165K. We explored a broad spectrum of cooling options and technologies to cool the MAIA detectors. Finally, compact free-piston Stirling coolers were selected, namely the CryoTel MT cryo-coolers from SUNPOWER, that can extract 5W of heat at a temperature of 77K. In this contribution we give details of the MAIA detector cooling solution. We also discuss the general usability of this type of closed-cycle cryo-coolers for astronomical detectors. They offer distinct advantages but the vibrations caused by ...

  5. Stirling engine research at national and university laboratories in Japan

    SciTech Connect (OSTI)

    Hane, G.J.; Hutchinson, R.A.

    1987-09-01T23:59:59.000Z

    Pacific Northwest Laboratory (PNL) reviewed research projects that are related to the development of Stirling engines and that are under way at Japanese national laboratories and universities. The research and development focused on component rather than on whole engine development. PNL obtained the information from a literature review and interviews conducted at the laboratories and universities. The universities have less equipment available and operate with smaller staffs for research than do the laboratories. In particular, the Mechanical Engineering Laboratory and the Aerospace Laboratory conduct high-quality component and fundamental work. Despite having less equipment, some of the researchers at the universities conduct high-quality fundamental research. As is typical in Japan, several of the university professors are very active in consulting and advisory capacities to companies engaged in Stirling engine development, and also with government and association advisory and technical committees. Contacts with these professors and selective examination of their research are good ways to keep abreast of Japanese Stirling developments.

  6. Design and fabrication of a meso-scale stirling engine and combustor.

    SciTech Connect (OSTI)

    Echekki, Tarek (Sandia National Laboratories, Livermore, CA); Haroldsen, Brent L. (Sandia National Laboratories, Livermore, CA); Krafcik, Karen L. (Sandia National Laboratories, Livermore, CA); Morales, Alfredo Martin (Sandia National Laboratories, Livermore, CA); Mills, Bernice E. (Sandia National Laboratories, Livermore, CA); Liu, Shiling (Sandia National Laboratories, Livermore, CA); Lee, Jeremiah C. (Sandia National Laboratories, Livermore, CA); Karpetis, Adionos N. (Sandia National Laboratories, Livermore, CA); Chen, Jacqueline H. (Sandia National Laboratories, Livermore, CA); Ceremuga, Joseph T. (Sandia National Laboratories, Livermore, CA); Raber, Thomas N. (Sandia National Laboratories, Livermore, CA); Hekmuuaty, Michelle A. (Sandia National Laboratories, Livermore, CA)

    2005-05-01T23:59:59.000Z

    Power sources capable of supplying tens of watts are needed for a wide variety of applications including portable electronics, sensors, micro aerial vehicles, and mini-robotics systems. The utility of these devices is often limited by the energy and power density capabilities of batteries. A small combustion engine using liquid hydrocarbon fuel could potentially increase both power and energy density by an order of magnitude or more. This report describes initial development work on a meso-scale external combustion engine based on the Stirling cycle. Although other engine designs perform better at macro-scales, we believe the Stirling engine cycle is better suited to small-scale applications. The ideal Stirling cycle requires efficient heat transfer. Consequently, unlike other thermodynamic cycles, the high heat transfer rates that are inherent with miniature devices are an advantage for the Stirling cycle. Furthermore, since the Stirling engine uses external combustion, the combustor and engine can be scaled and optimized semi-independently. Continuous combustion minimizes issues with flame initiation and propagation. It also allows consideration of a variety of techniques to promote combustion that would be difficult in a miniature internal combustion engine. The project included design and fabrication of both the engine and the combustor. Two engine designs were developed. The first used a cylindrical piston design fabricated with conventional machining processes. The second design, based on the Wankel rotor geometry, was fabricated by through-mold electroforming of nickel in SU8 and LIGA micromolds. These technologies provided the requisite precision and tight tolerances needed for efficient micro-engine operation. Electroformed nickel is ideal for micro-engine applications because of its high strength and ductility. A rotary geometry was chosen because its planar geometry was more compatible with the fabrication process. SU8 lithography provided rapid prototypes to verify the design. A final high precision engine was created via LIGA. The micro-combustor was based on an excess enthalpy concept. Development of a micro-combustor included both modeling and experiments. We developed a suite of simulation tools both in support of the design of the prototype combustors, and to investigate more fundamental aspects of combustion at small scales. Issues of heat management and integration with the micro-scale Stirling engine were pursued using CFD simulations. We found that by choice of the operating conditions and channel dimensions energy conversion occurs by catalysis-dominated or catalysis-then-homogeneous phase combustion. The purpose of the experimental effort in micro-combustion was to study the feasibility and explore the design parameters of excess enthalpy combustors. The efforts were guided by the necessity for a practical device that could be implemented in a miniature power generator, or as a stand-alone device used for heat generation. Several devices were fabricated and successfully tested using methane as the fuel.

  7. Water as a lubricant for Stirling air engines: design considerations and operating experience

    SciTech Connect (OSTI)

    Fauvel, O.R.; van Benthem, J.; Walker, G.

    1983-08-01T23:59:59.000Z

    Air is favoured as the working fluid for large, slow-running Stirling engines. Lubricating oil entering the working space could combine with compressed, heated air to form a mixture capable of spontaneous combustion. To preclude this possibility, water may be used as the lubricant in Stirling air engines. This paper reviews the lubrication requirements of Stirling air engines and the potential of water to fulfil these requirements. Some bearing and seal materials suitable for water-lubricated Stirling engines are reviewed in terms of a design case study for a 20 kW water lubricated Ringbom-Stirling air engine. Early operating experience with this engine is reported.

  8. Selection of stirling engine parameter and modes of joint operation with the Topaz II

    SciTech Connect (OSTI)

    Kirillov, E.Y.; Ogloblin, B.G.; Shalaev, A.I. [Central Design Bureau of Machine Building, Krasnogvardeyskaya Square 3, St. Petersburg, (Russia) 195272

    1996-03-01T23:59:59.000Z

    In addition to a high-temperature thermionic conversion cycle, application of a low-temperature machine cycle, such as the Stirling engine, is being considered. To select the optimum mode for joint operation of the Topaz II system and Stirling engine, output electric parameters are obtained as a function of thermal power released in the TFE fuel cores. The hydraulic diagram used for joint operation of the Topaz II and the Stirling engine is considered. Requirements to hydraulic characteristics of the Stirling engine heat exchanges are formulated. Scope of necessary modifications to mount the Stirling Engine on the Topaz II is estimated. {copyright} {ital 1996 American Institute of Physics.}

  9. Free-piston Stirling technology for space power

    SciTech Connect (OSTI)

    Slaby, J.G.

    1994-09-01T23:59:59.000Z

    An overview is presented of the NASA Lewis Research Center free-piston Stirling engine activities directed toward space power. This work is being carried out under NASA`s new Civil Space Technology Initiative (CSTI). The overall goal of CSTI`s High Capacity Power element is to develop the technology base needed to meet the long duration, high capacity power requirements for future NASA space missions. The Stirling cycle offers an attractive power conversion concept for space power needs. Discussed in this paper is the completion of the Space Power Demonstrator Engine (SPDE) testing - culminating in the generation of 25 kW of engine power from a dynamically-balanced opposed-piston Stirling engine at a temperature ratio of 2.0. Engine efficiency was approximately 22 percent. The SPDE recently has been divided into two separate single-cylinder engines, called Space Power Research Engines (SPRE), that now serve as test beds for the evaluation of key technology disciplines. These disciplines include hydrodynamic gas bearings, high-efficiency linear alternators, space qualified heat pipe heat exchangers, oscillating flow code validation, and engine loss understanding. The success of the SPDE at 650 K has resulted in a more ambitious Stirling endeavor - the design, fabrication, test and evaluation of a designed-for-space 25 kW per cylinder Stirling Space Engine (SSE). The SSE will operate at a hot metal temperature of 1050 K using superalloy materials. This design is a low temperature confirmation of the 1300 K design. It is the 1300 K free-piston Stirling power conversion system that is the ultimate goal; to be used in conjunction with the SP-100 reactor. The approach to this goal is in three temperature steps. However, this paper concentrates on the first two phases of this program - the 650 K SPDE and the 1050 K SSE.

  10. High-power baseline and motoring test results for the GPU-3 Stirling engine

    SciTech Connect (OSTI)

    Thieme, L.G.

    1981-06-01T23:59:59.000Z

    In support of the Department of Energy's Stirling Engine Highway Vehicle Systems program, the NASA Lewis Research Center has installed a 7.5-kilowatt (10-hp) GPU-3 Stirling engine with a motoring dynamometer to continue to obtain data for validating Stirling-cycle computer simulations and to prepare for future component testing. The engine was originally built by General Motors Research Laboratories for the US Army in 1965 as part of a 3-kilowatt engine-generator set. Baseline tests were run to map the engine over a range of mean compression-space pressures of 2.8 to 6.9 megapascals (400 to 1000 psi) and engine speeds of 1500 to 3500 rpm with both helium and hydrogen as the working fluid. All tests were run at a heater-tube gas temperature of 677/sup 0/C (1250/sup 0/F). Maximum power obtained with hydrogen was 6.82 kilowatts (9.14 hp) at 6.9 megapascals (1000 psi) and 3500 rpm. The maximum power with helium was 4.26 kilowatts (5.71 hp) at 6.9 megapascals (1000 psi) and 2500 rpm. The highest brake thermal efficiencies obtained were 26.4 percent for hydrogen and 21.3 percent for helium. These both occurred at 6.9-megapascal (1000-psi) mean compression-space pressure and 1500-rpm engine speed. The engine output was low at high speeds as compared with that for the previously reported low-power baseline tests that used the alternator and resistance load bank instead of the dynamometer. It is felt that this reduced power was caused by degradation of heat exchanger effectiveness as a result of contamination by rust and oil. However, efficiency was higher than in the previous tests because of the installation of a noncontaminated preheater that reduced combustion system losses.

  11. Operational feasibility of underwater Stirling engine systems using oxygen-seawater extraction

    SciTech Connect (OSTI)

    Potter, I.J.; Reader, G.T. [Univ. of Calgary, Alberta (Canada). Dept. of Mechanical Engineering

    1995-12-31T23:59:59.000Z

    The exploration of the oceans whether for societal, commercial, scientific or military reasons requires efficient and cost effective underwater vehicles. In turn, these vessels require efficient means of producing on board power for the propulsion and hotel load requirements of long endurance missions. The Stirling engine, because of its inherent closed-cycle operation, has long been an attractive candidate for underwater use and now has proved its reliability and maintainability in the arduous environment of a naval submarine application. More recently the Stirling has been considered for use in small long endurance unmanned underwater vessels (UUVs). However, with these type of vehicles the need to carry an on board oxygen supply in a very confined space has presented a number of design problems. The concept of using multi-stage vehicles with disposable energy pods has been explored and appears attractive although a major change in submarine design philosophy will be required if such vehicles are to launched from submarines. Another approach is to use a more space efficient source of oxygen. As seawater contains dissolved oxygen then if this source could be utilized to meet all or at least part of the engine`s need than a major design problem could be overcome. In this paper the findings of an initial study into the use of membranes or artificial gill techniques to provide oxygen for a Stirling powered DARPA type vehicle are presented. It has been found that only in certain sea areas is the concept of oxygen extraction feasible for use with power systems. Even in situations where there are sufficient levels of dissolved oxygen the gill system approach appears to have limited utility for UUV applications and a number of practical problems still need to be addressed.

  12. Rod seal device for Stirling engines

    SciTech Connect (OSTI)

    Kobayashi, D.; Itaba, T.; Momose, Y.

    1987-09-22T23:59:59.000Z

    A rod seal device for a Stirling engine is described which consists of: a piston rod having a first end connected to an operating piston for the engine and a second end connected to a guide piston disposed in a crank case; a compression chamber defined by the operating piston and a cylinder of the engine and including a working gas for the engine; a first intermediate chamber surrounding an outer periphery of the piston rod and being connected to the compression chamber and kept to maintain a minimum level of pressure of the working gas; a high pressure oil chamber disposed next to the first intermediate chamber and surrounding the outer periphery of the piston rod. A first low pressure oil chamber disposed next to the high pressure oil chamber via an oil seal member and surrounding the outer periphery of the piston rod. A first scraper seal disposed next to the first low pressure oil chamber and surrounding the outer periphery of the piston rod; a second intermediate chamber disposed next to the first low pressure oil chamber via the first scraper seal and surrounding the outer periphery of the piston rod; a second scraper seal disposed next to the second intermediate chamber and surrounding the outer periphery of the piston rod; a second low pressure oil chamber disposed next to the second intermediate chamber via the second scraper seal and surrounding the outer periphery of the piston rod, a second oil pump disposed between the second low pressure oil chamber and the second low pressure oil reservoir to positively discharge any gas introduced into the second low pressure oil chamber to the atmosphere; and a further oil seal disposed between the second low pressure oil chamber and a working gas chamber in the crank use for a power take-off device.

  13. Regenerator optimization for Stirling cycle refrigeration II

    SciTech Connect (OSTI)

    Colgate, S.A.; Petschek, A.G.

    1994-07-01T23:59:59.000Z

    A cryogenic regenerator for a Stirling cycle is discussed using fractional loss or entropy gain as the criterion of performance. The gas losses are treated separately from heat storage medium losses. We argue that the optimum design corresponds to uniform channel flow with minimum turbulence where the gas velocity and channel width are optimized as a function of gas temperature. The maximization of heat transfer from the gas to the wall and the minimization of entropy production by friction leads to a gas flow velocity equal to sound speed times loss fraction, 1/{sigma}. This velocity and an axial thermal conductivity in the gas leads to a minimum channel width and characteristic length, L=T(dz/dT). A particular scaling of width, W{sup 2} = W{sub o}{sup 2}T{sup 1/2}, and length, L = L{sub o} T{sup {minus}1/2} leads to a design where longitudinal conduction decreases as T{sup 3/2} and the remaining two losses, transverse conduction and friction are equal and constant. The loss fraction, 1/{sigma}, must be made quite small, {approximately}(1/60) in order that the cumulative losses for a large temperature ratio like 300K to 4K, be small enough, like 20% to 40%. This is because half the entropy generated as a loss must be transported first to the cold end before returning to the hot end before being rejected. The dead volume ratio then determines the minimum frequency and with it and the pressure the necessary wall properties. The thermal properties of the channel wall must then accommodate this cyclic heat flow without substantially increasing the loss fraction. This generation of entropy in the walls is derived in terms of the wall heat capacity and thermal conductivity.

  14. Stirling engines. (Latest citations from the COMPENDEX database). Published Search

    SciTech Connect (OSTI)

    Not Available

    1992-12-01T23:59:59.000Z

    The bibliography contains citations concerning Stirling engine technology. Design, development, performance testing, and applications are discussed, including power generation, cryogenic cooling, solar power applications, and ground and marine vehicles. The citations also examine engine component design and material testing results. (Contains 250 citations and includes a subject term index and title list.)

  15. High Temperature Variable Conductance Heat Pipes for Radioisotope Stirling Systems

    SciTech Connect (OSTI)

    Tarau, Calin; Walker, Kara L.; Anderson, William G. [Advanced Cooling Technologies, Inc. 1046 New Holland Ave. Lancaster, PA 17601 (United States)

    2009-03-16T23:59:59.000Z

    In a Stirling radioisotope system, heat must continually be removed from the GPHS modules, to maintain the GPHS modules and surrounding insulation at acceptable temperatures. Normally, the Stirling converter provides this cooling. If the Stirling engine stops in the current system, the insulation is designed to spoil, preventing damage to the GPHS, but also ending the mission. An alkali-metal Variable Conductance Heat Pipe (VCHP) is under development to allow multiple stops and restarts of the Stirling engine. The status of the ongoing effort in developing this technology is presented in this paper. An earlier, preliminary design had a radiator outside the Advanced Stirling Radioisotope Generator (ASRG) casing, used NaK as the working fluid, and had the reservoir located on the cold side adapter flange. The revised design has an internal radiator inside the casing, with the reservoir embedded inside the insulation. A large set of advantages are offered by this new design. In addition to reducing the overall size and mass of the VCHP, simplicity, compactness and easiness in assembling the VCHP with the ASRG are significantly enhanced. Also, the permanently elevated temperatures of the entire VCHP allows the change of the working fluid from a binary compound (NaK) to single compound (Na). The latter, by its properties, allows higher performance and further mass reduction of the system. Preliminary design and analysis shows an acceptable peak temperature of the ASRG case of 140 deg. C while the heat losses caused by the addition of the VCHP are 1.8 W.

  16. Parametric testing and evaluation of a free-piston Stirling engine/linear compressor system

    SciTech Connect (OSTI)

    Chiu, W.; Antoniak, Z.; Hogan, J.

    1983-08-01T23:59:59.000Z

    A 3 Kw free-piston Stirling engine (FPSE) driving a linear Rankine cycle vapor compressor has been under development by the Department of Energy, the Gas Research Institute and General Electric Company as a heat activated heat pump (HAHP) for residential applications since 1976. This paper presents data obtained from recent testing on the FPSE/linear compressor unit. System performance and engine/compressor matching and control tests and analyses are presented and discussed. Engine component performance and loss test data are also presented. A description of the low-cost real-time digital data acquisition system is included. Engine/compressor test results show maximum engine power levels over 3 Kw, close to the design goal of 3.2 Kw. However, maximum efficiency is approximately 25 percent, 5 points below the design goal. The test results are used to construct maps of engine performance and compressor performance. These maps support the engine/compressor matching techniques. Confirmation of the control system features needed to provide matched engine/compressor operation is presented. Loss measurements under engine oscillating flow conditions show that quasi-steady models of oscillating flow substantially underestimate losses, and that various Stirling engine models predict significantly different component losses. Both performance and component loss test results are combined with simulation trends to identify design improvements to the current hardware and the projected performance increases.

  17. ON THE PROBLEM OF UNIQUENESS FOR THE MAXIMUM STIRLING NUMBER(S) OF THE SECOND KIND

    E-Print Network [OSTI]

    Pomerance, Carl

    ON THE PROBLEM OF UNIQUENESS FOR THE MAXIMUM STIRLING NUMBER(S) OF THE SECOND KIND E. Rodney Say that an integer n is exceptional if the maximum Stirling number of the second kind S(n, k) occurs or equal to x is O(x3/5+ ), for any > 0. 1. Introduction Let S(n, k) be the Stirling number of the second

  18. p-ADIC STIRLING NUMBERS OF THE SECOND KIND DONALD M. DAVIS

    E-Print Network [OSTI]

    Davis, Donald M.

    p-ADIC STIRLING NUMBERS OF THE SECOND KIND DONALD M. DAVIS Abstract. Let S(n, k) denote the Stirling numbers of the second kind. We prove that the p-adic limit of S(pe a+c, pe b+d) as e exists or rational number and Up(n) = n/pp(n) denotes the unit factor in n. Here we do the same for Stirling numbers

  19. DIVISIBILITY BY 2 AND 3 OF CERTAIN STIRLING NUMBERS DONALD M. DAVIS

    E-Print Network [OSTI]

    Davis, Donald M.

    DIVISIBILITY BY 2 AND 3 OF CERTAIN STIRLING NUMBERS DONALD M. DAVIS Abstract. The numbers ep(k, n) defined as min(p(S(k, j)j!) : j n) appear frequently in algebraic topology. Here S(k, j) is the Stirling. The result for divisibility of Stirling numbers is, when p = 2, that for such integers n, 2(S(2L + n - 1, n

  20. A study on an air-water Stirling engine

    SciTech Connect (OSTI)

    Akayawa, H.; Hirata, M.; Kasayi, N.

    1983-08-01T23:59:59.000Z

    A two-phase two-component Stirling engine using an air-water mixture as a working fluid is presently constructed and tested. This choice of working fluid, instead of usually adopted gases such as hydrogen and helium, is aimed to realize a high volumetric efficiency by high heat transfer coefficients of evaporation and condensation in the heat exchangers. Based upon the results of the performance test of the engine, the effects of the air-water mixture ratio and the heat input are mainly studied and discussed. It is concluded that using a condensable working fluid is an effective measure to improve the performance of the Stirling engine for a comparatively low temperature heat source.

  1. Simulational nanoengineering: Molecular dynamics implementation of an atomistic Stirling engine

    E-Print Network [OSTI]

    Rapaport, D C

    2009-01-01T23:59:59.000Z

    A nanoscale-sized Stirling engine with an atomistic working fluid has been modeled using molecular dynamics simulation. The design includes heat exchangers based on thermostats, pistons attached to a flywheel under load, and a regenerator. Key aspects of the behavior, including the time-dependent flows, are described. The model is shown to be capable of stable operation while producing net work at a moderate level of efficiency.

  2. Santander Master's Scholarship The University of Stirling is pleased to offer nine 5,000 taught postgraduate scholarships

    E-Print Network [OSTI]

    Little, Tony

    Santander Master's Scholarship The University of Stirling is pleased to offer nine 5,000 taught annually? 4 scholarships - Stirling Master of Business Administration (MBA) 2 scholarships - MSc have accepted an offer of a place to study one of the named programmes at the University of Stirling

  3. TEST RESULTS FOR A STIRLING-ENGINE-DRIVEN HEAT-ACTUATED HEAT PUMP BREADBOARD SYSTEM T.M. Moynihan

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    849044 TEST RESULTS FOR A STIRLING-ENGINE-DRIVEN HEAT-ACTUATED HEAT PUMP BREADBOARD SYSTEM T and hydraulic transmission (Figure 2). Engine power is transferred to the i A Free-Piston Stirling Engine prime's performance/ Stirling Engine - Spring operation over the specified operating range, Driver -'i. i, C

  4. TRAFFIC AND PARKING REGULATIONS 2013/2014 The following document comprises the University of Stirling's Traffic & Parking

    E-Print Network [OSTI]

    Little, Tony

    of Stirling's Traffic & Parking Regulations and sets out the rules for all individuals bringing a vehicle onto the University's Stirling campus. These rules are referred to as the Regulations in this document and may & display ticket unless they opt to park in a full parking space. 1.10 The University of Stirling is a data

  5. 0^T^^^tf^*nl~~~~ ORNL/CON-154 Nonlinear Analysis of Stirling

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    0^T^^^tf^*nl~~~~ ORNL/CON-154 OAK RIDGE NATIONAL LABORATORY Nonlinear Analysis of Stirling . 3- Z. #12;ORNL/CON-154 Engineering Technology Division NONLINEAR ANALYSIS OF STIRLING ENGINE THERMODYNAMICS encouragement. #12;NONLINEAR ANALYSIS OF STIRLING ENGINE THERMODYNAMICS R. D. Banduric N. C. J. Chen ABSTRACT

  6. ccsd-00068906,version2-6Jun2006 STATISTICS ON ORDERED PARTITIONS OF SETS AND q-STIRLING

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ccsd-00068906,version2-6Jun2006 STATISTICS ON ORDERED PARTITIONS OF SETS AND q-STIRLING NUMBERS blocks is k!S(n, k), where S(n, k) is the Stirling number of second kind. In this paper we prove some re of Theorem 3.8 22 References 28 Keywords: ordered partitions, Euler-Mahonian statistics, q-Stirling numbers

  7. A NOTE ON STIRLING'S FORMULA FOR THE GAMMA DORIN ERVIN DUTKAY, CONSTANTIN P. NICULESCU, AND FLORIN POPOVICI

    E-Print Network [OSTI]

    Niculescu, Constantin P.

    A NOTE ON STIRLING'S FORMULA FOR THE GAMMA FUNCTION DORIN ERVIN DUTKAY, CONSTANTIN P. NICULESCU, AND FLORIN POPOVICI Abstract. We present a new short proof of Stirling's formula for the Gamma function. Our approach combines Stirling's initial formula for n!, the Gauss product formula and a remark concerning

  8. FPSAC 2008 DMTCS proc. (subm.), by the authors, 112 On the 2-adic order of Stirling numbers of the

    E-Print Network [OSTI]

    Lengyel, Tamás

    FPSAC 2008 DMTCS proc. (subm.), by the authors, 1­12 On the 2-adic order of Stirling numbers and polynomials related to the Stirling numbers and Bell polynomials, and some divisibility properties. Keywords: Stirling number of the second kind, congruences for power series and polynomials, divisibility 1

  9. Discrete Mathematics and Theoretical Computer Science DMTCS vol. 10:2, 2008, 7786 A Determinant of Stirling Cycle Numbers

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of Stirling Cycle Numbers Counts Unlabeled Acyclic Single-Source Automata David Callan Department 2007, revised 7 May 2008, accepted 18 May 2008. We show that a determinant of Stirling cycle numbers a formula for the number of acyclic automata with a given set of sources. Keywords: Stirling cycle number

  10. Vers une formule de Stirling de la factorielle de Bhargava pour des entiers reconnaissables par un automate

    E-Print Network [OSTI]

    Dumont, Serge

    Vers une formule de Stirling de la factorielle de Bhargava pour des entiers reconnaissables par un¸con intrins`eque en th´eorie des nombres. Ainsi l'estimation de cette fonction par la formule de Stirling se r savoir quel est l'analogue de la formule de Stirling pour un sous ensemble E ? Quels sont les propri

  11. Design of a 2.5kW Low Temperature Stirling Engine for Distributed Solar Thermal Generation

    E-Print Network [OSTI]

    Sanders, Seth

    Design of a 2.5kW Low Temperature Stirling Engine for Distributed Solar Thermal Generation Mike He on the design of a Stirling engine for distributed solar thermal ap- plications. In particular, we design for experimentation. Stirling engines can have broad significance and technological advantages for distributed

  12. THE p-ADIC VALUATION OF STIRLING NUMBERS ANA BERRIZBEITIA, LUIS A. MEDINA, ALEXANDER C. MOLL, VICTOR H. MOLL,

    E-Print Network [OSTI]

    Moll, Victor H.

    THE p-ADIC VALUATION OF STIRLING NUMBERS ANA BERRIZBEITIA, LUIS A. MEDINA, ALEXANDER C. MOLL, VICTOR H. MOLL, AND LAINE NOBLE Abstract. Let p > 2 be a prime. The p-adic valuation of Stirling numbers. Introduction The Stirling numbers of second kind S(n, k), defined for n N and 0 k n count the number of ways

  13. TRAFFIC AND PARKING REGULATIONS 2014/2015 The following document comprises the University of Stirling's Traffic & Parking

    E-Print Network [OSTI]

    Little, Tony

    of Stirling's Traffic & Parking Regulations and sets out the rules for all individuals bringing a vehicle onto the University's Stirling campus. These rules are referred to as the Regulations in this document and may & display ticket unless they opt to park in a full parking space. #12;2 1.9 The University of Stirling

  14. THE q-STIRLING NUMBERS, CONTINUED FRACTIONS AND THE q-CHARLIER AND q-LAGUERRE POLYNOMIALS

    E-Print Network [OSTI]

    Zeng, Jiang

    THE q-STIRLING NUMBERS, CONTINUED FRACTIONS AND THE q-CHARLIER AND q of the q-Stirling numbers of both kinds. By generalizing the method o* *f Touchard [To] and Milne [Mi1] we obtain the explicit formulas and measure of one set of the p* *olynomials whose moments are the q-Stirling

  15. Critical issues in the development of hybrid solar/gas receivers for dish/Stirling systems

    SciTech Connect (OSTI)

    Adkins, D.R.; Rawlinson, K.S.

    1991-01-01T23:59:59.000Z

    A hybrid solar/gas receiver system will allow Stirling engines to operate with combined solar and gas power sources. One of the most attractive options for building a hybrid system is to integrate a gas-fired heat pipe directly into a heat-pipe solar receiver. Before this union can take place, however, a number of technical issues must be resolved. A design must be found that properly distributes the heat-pipe's working fluid over the heated surfaces and prevents fluid from accumulating at undesirable locations in the heat pipe. Experience that has been gained in developing solar receivers and gas-fired heat pipes under recent Department of Energy solar-thermal dish-electric programs is used in this paper to address many of the technical obstacles to building receiver systems. 16 refs.

  16. From jet fuel to electric power using a mesoscale, efficient Stirling cycle

    E-Print Network [OSTI]

    Gomez, Alessandro

    combustor coupled with a free-piston Stirling engine. The design and development of a catalytic combustor and efficiently, and a recuperator to improve the system thermodynamic efficiency. The combustor/recuperator unit ratios varying in the 0.350.70 range. The combustor is interfaced with a free-piston Stirling engine

  17. Solar-parabolic dish-Stirling-engine-system module. Task 1: Topical report, market assessment/conceptual design

    SciTech Connect (OSTI)

    Not Available

    1982-11-30T23:59:59.000Z

    The major activities reported are: a market study to identify an early market for a dish-Stirling module and assess its commercial potential; preparation of a conceptual system and subsystem design to address this market; and preparation of an early sales implementation plan. A study of the reliability of protection from the effects of walk-off, wherein the sun's image leaves the receiver if the dish is not tracking, is appended, along with an optical analysis and structural analysis. Also appended are the relationship between PURPA and solar thermal energy development and electric utility pricing rationale. (LEW)

  18. Journal of Prime Research in Mathematics Vol. 8(2012), 01-04 A NOTE ON STIRLING'S FORMULA FOR THE GAMMA

    E-Print Network [OSTI]

    Niculescu, Constantin P.

    2012-01-01T23:59:59.000Z

    Journal of Prime Research in Mathematics Vol. 8(2012), 01-04 A NOTE ON STIRLING'S FORMULA a new short proof of Stirling's formula for the Gamma function. Our approach is based on the Gauss theorem, Stirling's formula, Gosper's formula. AMS subject: Primary 26A51. Secondary 26A48. Stirling

  19. The Moscrip-Stirling engine -- A new departure

    SciTech Connect (OSTI)

    Moscrip, W.M.

    1984-08-01T23:59:59.000Z

    A new approach to the design, construction, and operation of Stirling cycle machines is described which embodies a new class of working fluids, alternative mechanical arrangements, and novel applications of advanced materials. Several dense covalent fluorine compounds are set forth as noncryogenic working fluids with higher heat transfer coefficients than H/sub 2/ or He. A novel control method is disclosed which stresses working fluid phase changes. A new mechanical arrangement is discussed which is a single-acting analog of the Rinia arrangement. The specific use of metal-matrix composites, advanced structural ceramics, heat pipes, and anisotropic regenerator construction is recommended.

  20. Leakage gas recirculation system for use in Stirling engine

    SciTech Connect (OSTI)

    Asano, K.

    1980-04-15T23:59:59.000Z

    A leakage gas return device for a Stirling engine includes a pumping cylinder divided into first and second chambers by a piston, one of the chambers for receiving leakage gas from the block seal through a first one way valve and returning the leakage gas to the engine cylinder through a second one-way valve. The other chamber is first connected to a low pressure oil source to permit expansion of the first chamber by the leakage gas, and at bottom dead center the second chamber is connected to a high pressure oil source to thereby force the leakage gas back into the engine cylinder.

  1. Method of fabricating a heat exchanger for Stirling engine

    SciTech Connect (OSTI)

    Rao, V.D.

    1980-10-28T23:59:59.000Z

    A heat exchange assembly and method for making same is disclosed which is useful for Stirling engine heater head constructions. The assembly is comprised entirely of a low cost extrudable material, such as silicon, which when fused in a carburizing furnace provides a rigid highly durable ceramic. Heater tubes are arranged within a chamber, the tubes carry ambient pressure high temperature combusted gases and the chamber containing high pressure lower temperature working gases about the exterior of each tube. Heat exchange can additionally be improved by increasing the exterior surface area of each tube relative to the interior surface thereof.

  2. Feedback air-fuel control system for Stirling engines

    SciTech Connect (OSTI)

    Monahan, R.

    1991-11-19T23:59:59.000Z

    This patent describes improvement in combination with a Stirling engine having an air-fuel ratio control and an exhaust gas emission outlet. The improvement comprises an oxygen sensor in communication with the exhaust gas emission outlet for generating an output signal representative of the oxygen content in the outlet; a sensor signal conditioning unit for adapting the output signal to a conditioned input signal for a microprocessor; and a microprocessor controlled pilot for adjusting the air-fuel control in response to the control input signal.

  3. Flexure bearing support, with particular application to stirling machines

    DOE Patents [OSTI]

    Beckett, Carl D. (Vancouver, WA); Lauhala, Victor C. (Richland, WA); Neely, Ron (Kennewick, WA); Penswick, Laurence B. (Richland, WA); Ritter, Darren C. (Benton City, WA); Nelson, Richard L. (Pasco, WA); Wimer, Burnell P. (Boise, ID)

    1996-01-01T23:59:59.000Z

    The use of flexures in the form of flat spiral springs cut from sheet metal materials provides support for coaxial nonrotating linear reciprocating members in power conversion machinery, such as Stirling cycle engines or heat pumps. They permit operation with little or no rubbing contact or other wear mechanisms. The relatively movable members include one member having a hollow interior structure within which the flexures are located. The flexures permit limited axial movement between the interconnected members, but prevent adverse rotational movement and radial displacement from their desired coaxial positions.

  4. Integral finned heater and cooler for stirling engines

    DOE Patents [OSTI]

    Corey, John A. (North Troy, NY)

    1984-01-01T23:59:59.000Z

    A piston and cylinder for a Stirling engine and the like having top and bottom meshing or nesting finned conical surfaces to provide large surface areas in close proximity to the working gas for good thermal (addition and subtraction of heat) exchange to the working gas and elimination of the usual heater and cooler dead volume. The piston fins at the hot end of the cylinder are perforated to permit the gas to pass into the piston interior and through a regenerator contained therein.

  5. Flexure bearing support, with particular application to Stirling machines

    DOE Patents [OSTI]

    Beckett, C.D.; Lauhala, V.C.; Neely, R.; Penswick, L.B.; Ritter, D.C.; Nelson, R.L.; Wimer, B.P.

    1996-06-04T23:59:59.000Z

    The use of flexures in the form of flat spiral springs cut from sheet metal materials provides support for coaxial non-rotating linear reciprocating members in power conversion machinery, such as Stirling cycle engines or heat pumps. They permit operation with little or no rubbing contact or other wear mechanisms. The relatively movable members include one member having a hollow interior structure within which the flexures are located. The flexures permit limited axial movement between the interconnected members, but prevent adverse rotational movement and radial displacement from their desired coaxial positions. 8 figs.

  6. Stirling engine ready for subsea deployment

    SciTech Connect (OSTI)

    Not Available

    1985-05-01T23:59:59.000Z

    The key technologies are now in place to provide for long-term independent diver support on the seabed, in place of large and costly surface support spreads. The lack of a compact air-independent energy source in the medium power range has prevented the evolution of underwater autonomous offshore operations. Five key advancements will now permit surface-independence in the performance of many subsea tasks: efficient and compact power and heat energy, computerized systems for navigation and instrumentation, composite materials for high pressure, low weight gas storage, closed-circuit breathing systems for divers, and underwater robotics and artificial intelligence.

  7. Multi-stage Cascaded Stirling Refrigerator

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighandSWPA / SPRA /Ml'.SolarUS Dept ofActing ChiefofStöhr ResearchEnergy

  8. Stirling converters for space dynamic power concepts with 2 to 130 W{sub e} output

    SciTech Connect (OSTI)

    Ross, B.A. [Stirling Technology Co., Richland, WA (United States)

    1995-12-31T23:59:59.000Z

    Three innovative Stirling converter concepts are described. Two concepts are based on Pluto Fast Flyby (PFF) mission requirements, where two General Purpose Heat Source (GPHS) modules provide the thermal input. The first concept (PFF2) considers a power system with two opposed Stirling converters; the second concept (PFF4) considers four opposed Stirling converters. For both concepts the Stirling converters are designed to vary their power production capability to compensate for the failure of one Stirling converter. While the net thermal efficiency of PFF4 is a few percentage points lower than PFF2, the total Stirling converter mass of PFF4 is half that for PFF2. The third concept (ITTI) is designed to supply 2 watts of power for weather stations on the Martian surface. The predicted thermal performance of the ITTI is low compared to PFF2 and PFF4, yet the ITTI concept offers significant advantages compared to currently available power systems at the 2-watt power level. All three concepts are based on long-life technology demonstrated by an 11-watt output Stirling generator that as of March 1995 has accumulated over 15,000 operating hours without maintenance.

  9. Stirling engine performance optimization with different working fluids

    SciTech Connect (OSTI)

    Daley, J.G.; Marr, W.W.; Heames, T.J.

    1986-01-01T23:59:59.000Z

    The design flexibility of Stirling cycle devices is evident from the wide variety of mechanical configurations that have been developed as well as the many differing applications that have been shown to be technically feasible. The choice of working fluid is one option that strongly influences engine design. Hydrogen permits the most compact engine (for a given power output and efficiency) of any gaseous working fluid investigated and has therefore been the choice in Stirling development programs directed at the automotive application where engine size is a major concern. Systems using helium or air are presently under development for applications where size is not as important a consideration. This paper describes calculated characteristics of engines optimized for four working fluids (hydrogen, helium, air and methane). A comparison is given between engines whose exterior dimensions are minimized and with lower rpm, lower pressure engine designs calculated by maximizing the dimensionless parameter known as the Beale number. Design point power and efficiency are the same in the resulting eight conceptual designs but great variation is shown in engine characteristics due both to working fluid differences and to the two different design objectives. 5 refs., 7 figs., 5 tabs.

  10. Dish/stirling hybrid-receiver

    DOE Patents [OSTI]

    Mehos, Mark S. (Boulder, CO); Anselmo, Kenneth M. (Arvada, CO); Moreno, James B. (Albuquerque, NM); Andraka, Charles E. (Albuquerque, NM); Rawlinson, K. Scott (Albuquerque, NM); Corey, John (Melrose, NY); Bohn, Mark S. (Golden, CO)

    2002-01-01T23:59:59.000Z

    A hybrid high-temperature solar receiver is provided which comprises a solar heat-pipe-receiver including a front dome having a solar absorber surface for receiving concentrated solar energy, a heat pipe wick, a rear dome, a sidewall joining the front and the rear dome, and a vapor and a return liquid tube connecting to an engine, and a fossil fuel fired combustion system in radial integration with the sidewall for simultaneous operation with the solar heat pipe receiver, the combustion system comprising an air and fuel pre-mixer, an outer cooling jacket for tangentially introducing and cooling the mixture, a recuperator for preheating the mixture, a burner plenum having an inner and an outer wall, a porous cylindrical metal matrix burner firing radially inward facing a sodium vapor sink, the mixture ignited downstream of the matrix forming combustion products, an exhaust plenum, a fossil-fuel heat-input surface having an outer surface covered with a pin-fin array, the combustion products flowing through the array to give up additional heat to the receiver, and an inner surface covered with an extension of the heat-pipe wick, a pin-fin shroud sealed to the burner and exhaust plenums, an end seal, a flue-gas diversion tube and a flue-gas valve for use at off-design conditions to limit the temperature of the pre-heated air and fuel mixture, preventing pre-ignition.

  11. Enhanced air/fuel mixing for automotive stirling engine turbulator-type combustors

    SciTech Connect (OSTI)

    Riecke, George T. (Ballston Spa, NY); Stotts, Robert E. (Newark, NY)

    1992-01-01T23:59:59.000Z

    The invention relates to the improved combustion of fuel in a combustion chamber of a stirling engine and the like by dividing combustion into primary and secondary combustion zones through the use of a diverter plate.

  12. An integrated geometric and thermodynamic performance model of the 2.670 Stirling Engine

    E-Print Network [OSTI]

    Sohn, Munhee, 1981-

    2004-01-01T23:59:59.000Z

    2.670 is a required mechanical engineering class taught during the Independent Activities Period (IAP) at MIT in which each student constructs a Stirling Engine. For the most part, all of the engine parts are uniform, but ...

  13. Process and apparatus for reducing the loss of hydrogen from Stirling engines

    SciTech Connect (OSTI)

    Alger, D.L.

    1987-03-24T23:59:59.000Z

    A Stirling engine assembly is described which defines a working gas volume therein, the Stirling engine assembly comprising: a working gas reservoir for storing a working gas at a pressure greater than pressure of the working gas in the working volume of the Stirling engine; a trap cell operatively connected between an outlet of the reservoir and the Stirling engine working volume. The trap cell includes an enclosure having porous windows at either end thereof and a sorbent with an affinity for water vapor therein, such that water vapor adsorbed on the sorbent diffuses into the hydrogen passing from the reservoir into the working engine; a compressor means for drawing working gas from the Stirling engine working volume, through the trap cell and pumping the working gas into the hydrogen reservoir. The sorbent in the trap cell at the reduced pressure caused by the compressor adsorbs water vapor from the working gas such that substantially dry working gas is pumped by the compressor into the reservoir. The working gas is doped with water vapor by the tank cell as it passes into the Stirling engine and is dried by the trap cell as it is removed from the working engine for storage in the reservoir to prevent condensation of water vapor in the reservoir.

  14. Apparatus for controlling working gas pressure in Stirling engines

    SciTech Connect (OSTI)

    Tsunekawa, M.; Naito, Y.; Hyodo, M.; Hayashi, T.

    1987-11-17T23:59:59.000Z

    A working gas pressure control apparatus for a Stirling engine is described which comprises: a pressure boost valve provided in a minimum cycle pressure line connected to a working space by a first unidirectional valve; a pressure reducing valve provided in a maximum cycle pressure line connected to the working space by a second unidirectional valve; an operating lever for controlling opening and closing of the pressure boost valve and the pressure reducing valve; a compressor connected by the pressure reducing valve and the pressure boost valves to the cycle pressure lines; an unloading valve arranged in a circuit short-circuiting suction and discharge lines of the compressor; and a control circuit for opening the unloading valve when any one of a rotational speed of the engine falls to a value lower than a present rotational speed for engine idling, the pressure boost valve is opened, and the engine is in a steady-state mode of operation.

  15. Stirling engine power control and motion conversion mechanism

    DOE Patents [OSTI]

    Marks, David T. (Birmingham, MI)

    1983-01-01T23:59:59.000Z

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

  16. Metric intersection problems in Cayley graphs and the Stirling recursion

    E-Print Network [OSTI]

    Phongpattanacharoen, Teeraphong

    2012-01-01T23:59:59.000Z

    In the symmetric group Sym(n) with n at least 5 let H be a conjugacy class of elements of order 2 and let \\Gamma be the Cayley graph whose vertex set is the group G generated by H (so G is Sym(n) or Alt(n)) and whose edge set is determined by H. We are interested in the metric structure of this graph. In particular, for g\\in G let B_{r}(g) be the metric ball in \\Gamma of radius r and centre g. We show that the intersection numbers \\Phi(\\Gamma; r, g):=|\\,B_{r}(e)\\,\\cap\\,B_{r}(g)\\,| are generalized Stirling functions in n and r. The results are motivated by the study of error graphs and related reconstruction problems.

  17. The United Stirling 4-95 and 4-275 Engines I underwater use

    SciTech Connect (OSTI)

    Nilsson, H.

    1983-08-01T23:59:59.000Z

    The United Stirling 4-95 and 4-275 well-known engines have been adapted to underwater operation. The 4-95 power module has an output of 20 kW /SUB e/ and 40 kW as heat. The standard 4-95 engine has been modified for a pressurized combustion. The combustion pressure mates with the surrounding water depth at current limits for operational offshore diving. Hence no energy consuming compression or any complex dissolving system for the exhaust gas is required. Increased diving depth can be reached through already established technology. Combustion gas recirculation is used as thermic ballast and for flame temperature control, when using pure oxygen. The 4-275 engine is currently subject to underwater modification utilizing the same technology. This energy module will have an output of 100 kW /SUB e/ and 200 kW as heat. The system will comprise a LOX-storage, thus providing extensive underwater air-independent endurance. Based upon extensive laboratory testing and demonstrations under submerged conditions, the system is now scheduled for field testing and commercial introduction.

  18. Comparison of steady-state and transient CVS cycle emissions of an automotive Stirling engine

    SciTech Connect (OSTI)

    Farrell, R.A.; Bolton, R.J.

    1983-10-01T23:59:59.000Z

    One of the goals of the Automotive Stirling Engine Development Program, sponsored by the Department of Energy and managed by NASA/Lewis Research Center, is to develop a rationale for predicting transient CVS cycle emissions from steady-state engine data. A technique is developed that integrates engine emissions as a function of fuel flow over a modelled CVS cycle to predict vehicle urban cycle results. Steady-state emissions data from three Mod I engines* burning unleaded gasoline are used to predict vehicle NO /SUB x/, CO, and HC emissions. A total of 155 data points representing variations in engine power, excess air (lambda), and the exhaust gas recirculation (EGR) schedule are utilized. Predictions are then compared to the results of nine urban CVS cycle tests of the Mod I/Lerma vehicle, and a conclusion is reached that very accurate predictions of vehicle NO /SUB x/ emissions are possible. CO and HC emissions are considerably higher than predicted due to extreme sensitivity of CO emissions to Lambda, the effect of heater head temperature, and failure of the engine to accurately reflect emissions during start-up.

  19. Programmatic status of NASA`s CSTI high capacity power Stirling Space Power Converter Program

    SciTech Connect (OSTI)

    Dudenhoefer, J.E.

    1994-09-01T23:59:59.000Z

    An overview is presented of the NASA Lewis Research Center Free-Piston Stirling Space Power Converter Technology Development Program. This work is being conducted under NASA`s Civil Space Technology Initiative (CSTI). The goal of the CSTI High Capacity Power element is to develop the technology base needed to meet the long duration, high capacity power requirements for future NASA space initiatives. Efforts are focused upon increasing system thermal and electric energy conversion efficiency at least fivefold over current SP-100 technology, and on achieving systems that are compatible with space nuclear reactors. This paper will discuss the status of test activities with the Space Power Research Engine (SPRE). Design deficiencies are gradually being corrected and the power converter is now outputting 11.5 kWe at a temperature ratio of 2 (design output is 12.5 kWe). Detail designs have been completed for the 1050 K Component Test Power Converter (CTPC). The success of these and future designs is dependent upon supporting research and technology efforts including heat pipes, gas bearings, superalloy joining technologies and high efficiency alternators. This paper also provides an update of progress in these technologies.

  20. Large Parabolic Dish collectors with small gas-turbine, Stirling engine or photovoltaic power conversion systems

    SciTech Connect (OSTI)

    Gehlisch, K.; Heikal, H.; Mobarak, A.; Simon, M.

    1982-08-01T23:59:59.000Z

    A comparison for different solar thermal power plants is presented and demonstrates that the large parabolic dish in association with a gas turbine or a Sterling engine could be a competitive system design in the net power range of 50-1000KW. The important advantages of the Large Parabolic Dish concept compared to the Farm and Tower concept are discussed: concentration ratios up to 5000 and uniform heat flux distribution throughout the day which allow very high receiver temperatures and therefor high receiver efficiency to operate effectively Stirling motors or small gas turbines in the mentioned power range with an overall efficiency of 20 to 30%. The high focal plane concentration leads to the efficient use of ceramic materials for receivers of the next generation, applicable in temperature ranges up to 1,300 /sup 0/C for energy converters. Besides the production of electricity, the system can supply process heat in the temperature range of 100 to 400 /sup 0/C as waste heat from the gas turbo converter and heat at temperature levels from 500 to 900 /sup 0/C (1300 /sup 0/C) directly out of the receiver.

  1. Accelerated Life Structural Benchmark Testing for a Stirling Convertor Heater Head

    SciTech Connect (OSTI)

    Krause, David L. [National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135 (United States); Kantzos, Pete T. [Ohio Aerospace Institute, NASA Glenn Research Center, Cleveland, OH 44135 (United States)

    2006-01-20T23:59:59.000Z

    For proposed long-duration NASA Space Science missions, the Department of Energy, Lockheed Martin, Infinia Corporation, and NASA Glenn Research Center are developing a high-efficiency, 110-watt Stirling Radioisotope Generator (SRG110). A structurally significant limit state for the SRG110 heater head component is creep deformation induced at high material temperature and low stress level. Conventional investigations of creep behavior adequately rely on experimental results from uniaxial creep specimens, and a wealth of creep data is available for the Inconel 718 material of construction. However, the specified atypical thin heater head material is fine-grained with a heat treatment that limits precipitate growth, and little creep property data for this microstructure is available in the literature. In addition, the geometry and loading conditions apply a multiaxial stress state on the component, far from the conditions of uniaxial testing. For these reasons, an extensive experimental investigation is ongoing to aid in accurately assessing the durability of the SRG110 heater head. This investigation supplements uniaxial creep testing with pneumatic testing of heater head-like pressure vessels at design temperature with stress levels ranging from approximately the design stress to several times that. This paper presents experimental results, post-test microstructural analyses, and conclusions for four higher-stress, accelerated life tests. Analysts are using these results to calibrate deterministic and probabilistic analytical creep models of the SRG110 heater head.

  2. Bio-inspired Active Soft Orthotic Device for Ankle Foot Pathologies Yong-Lae Park, Bor-rong Chen, Diana Young, Leia Stirling,

    E-Print Network [OSTI]

    Napp, Nils

    , Diana Young, Leia Stirling, Robert J. Wood, Eugene Goldfield, and Radhika Nagpal Abstract-- We describe of the NSF. Y.-L. Park, D. Young, and L. Stirling are with the Wyss Institute, Harvard University, Boston, MA 02115. {ylpark, diana.young, leia.stirling}@wyss.harvard.edu B. Chen is with the School of Engineering

  3. Abstract A control-based analysis and characterization of a free-piston Stirling engine is presented, and proposed as a

    E-Print Network [OSTI]

    Barth, Eric J.

    Abstract ­ A control-based analysis and characterization of a free-piston Stirling engine. The results show promising potential in utilizing small-scale free-piston Stirling engines as portable power. The motivation details are discussed more thoroughly in [1]. Stirling engines are typically regarded

  4. ON THE DIVISIBILITY BY 2 OF THE STIRLING NUMBERS OF THE SECOND KIND Occidental College, 1600 Campus Road, Los Angeles, CA 90041

    E-Print Network [OSTI]

    Lengyel, Tamás

    ON THE DIVISIBILITY BY 2 OF THE STIRLING NUMBERS OF THE SECOND KIND T. Lengyel Occidental College characterize the divisibilityby 2 of the Stirling number of the second kind, Sn;k; where n is a su ciently high follows from the periodicity of the Stirling numbers modulo any prime power. For k 5, the function Lk can

  5. Adopt a Book Thank you for your kind offer to Adopt a Book at the University of Stirling.Your gift will be used to

    E-Print Network [OSTI]

    Little, Tony

    Adopt a Book Thank you for your kind offer to Adopt a Book at the University of Stirling.Your gift my cheque/Charities Aid Voucher for 30.00 payable to `University of Stirling' I wish to make my different from above): Bookplates To recognise your gift, Stirling will put a dedicate bookplate into a book

  6. J. Phys. III Yance 7 (1997) 1571-1591 JULY1997, PAGE1571 l~lvaluation pratique des performances d'une machine Stirling de

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1997-01-01T23:59:59.000Z

    'une machine Stirling de taille r4duite fonctionnant en cycle ffigorifique Ph. Nika et F. Lanzetta (*) Institut thermodynamique de Stirling de tattle r4duite fonctionnant en cycle frigorifique. La m4thode retenue est bas4e surrimentaux. Abstract. This paper describes predict performance and testing of a small Stirling cooling

  7. Corresponding author: Shi-Chune Yao, Email: scyao@cmu.edu, Paper number: HT-12-1144. 1 Design and Evaluation of a MEMS-Based Stirling Microcooler

    E-Print Network [OSTI]

    McGaughey, Alan

    and Evaluation of a MEMS-Based Stirling Microcooler Dongzhi Guo1 , Jinsheng Gao2 , Alan J. H. McGaughey1 , Gary K-6431 ABSTRACT A new Stirling micro-refrigeration system composed of arrays of silicon MEMS cooling elements has are explored. The optimal porosity for the best system COP is identified. Keywords: Stirling microcooler

  8. The University of Stirling Vietnam Award This award offers a fee waiver of 1,000 for the first year and 500 for years two,

    E-Print Network [OSTI]

    Little, Tony

    The University of Stirling Vietnam Award This award offers a fee waiver of 1,000 for the first-time undergraduate or postgraduate (taught or research) degree. The University of Stirling wishes to offer this award at Stirling and add to our already diverse international community on campus. Students do not have to apply

  9. ON THE DIVISIBILITY BY 2 OF THE STIRLING NUMBERS OF THE SECOND KIND Occidental College, 1600 Campus Road, Los Angeles, CA 90041

    E-Print Network [OSTI]

    Lengyel, Tamás

    ON THE DIVISIBILITY BY 2 OF THE STIRLING NUMBERS OF THE SECOND KIND T. Lengyel Occidental College characterize the divisibility by 2 of the Stirling number of the second kind, S(n; k); where n, independently from n: (Here the independence follows from the periodicity of the Stirling numbers modulo any

  10. Testing of Stirling engine solar reflux heat-pipe receivers

    SciTech Connect (OSTI)

    Rawlinson, S.; Cordeiro, P.; Dudley, V.; Moss, T.

    1993-07-01T23:59:59.000Z

    Alkali metal heat-pipe receivers have been identified as a desirable interface to couple a Stirling-cycle engine with a parabolic dish solar concentrator. The reflux receiver provides power nearly isothermally to the engine heater heads while de-coupling the heater head design from the solar absorber surface design. The independent design of the receiver and engine heater head leads to high system efficiency. Heat pipe reflux receivers have been demonstrated at approximately 30 kW{sub t} power throughput by others. This size is suitable fm engine output powers up to 10 kW{sub e}. Several 25-kW{sub e}, Stirling-cycle engines exist, as well as designs for 75-kW{sub t} parabolic dish solar concentrators. The extension of heat pipe technology from 30 kW{sub t} to 75 kW{sub t} is not trivial. Heat pipe designs are pushed to their limits, and it is critical to understand the flux profiles expected from the dish, and the local performance of the wick structure. Sandia has developed instrumentation to monitor and control the operation of heat pipe reflux receivers to test their throughput limits, and analytical models to evaluate receiver designs. In the past 1.5 years, several heat pipe receivers have been tested on Sandia`s test bed concentrators (TBC`s) and 60-kW{sub t} solar furnace. A screen-wick heat pipe developed by Dynatherm was tested to 27.5 kW{sub t} throughput. A Cummins Power Generation (CPG)/Thermacore 30-kW{sub t} heat pipe was pushed to a throughput of 41 kW{sub t} to verify design models. A Sandia-design screen-wick and artery 75-kW{sub t} heat pipe and a CPG/Thermacore 75-kW{sub t} sintered-wick heat pipe were also limit tested on the TBC. This report reviews the design of these receivers, and compares test results with model predictions.

  11. Status of an advanced radioisotope space power system using free-piston Stirling technology

    SciTech Connect (OSTI)

    White, M.A,; Qiu, S.; Erbeznik, R.M.; Olan, R.W.; Welty, S.C.

    1998-07-01T23:59:59.000Z

    This paper describes a free-piston Stirling engine technology project to demonstrate a high efficiency power system capable of being further developed for deep space missions using a radioisotope (RI) heat source. The key objective is to develop a power system with an efficiency exceeding 20% that can function with a high degree of reliability for 10 years or longer on deep space missions. Primary issues being addressed for Stirling space power systems are weight and the vibration associated with reciprocating pistons. Similar weight and vibration issues have been successfully addressed with Stirling cryocoolers, which are the accepted standard for cryogenic cooling in space. Integrated long-life Stirling engine-generator (or convertor) operation has been demonstrated by the terrestrial Radioisotope Stirling Generator (RSG) and other Stirling Technology Company (STC) programs. Extensive RSG endurance testing includes more than 40,000 maintenance-free, degradation-free hours for the complete convertor, in addition to several critical component and subsystem endurance tests. The Stirling space power convertor project is being conducted by STC under DOE Contract, and NASA SBIR Phase II contracts. The DOE contract objective is to demonstrate a two-convertor module that represents half of a nominal 150-W(e) power system. Each convertor is referred to as a Technology Demonstration Convertor (TDC). The ultimate Stirling power system would be fueled by three general purpose heat source (GPHS) modules, and is projected to produce substantially more electric power than the 150-watt target. The system is capable of full power output with one failed convertor. One NASA contract, nearing completion, uses existing 350-W(e) RG-350 convertors to evaluate interactivity of two back-to-back balanced convertors with various degrees of electrical and mechanical interaction. This effort has recently provided the first successful synchronization of two convertors by means of parallel alternator electrical connections, thereby reducing vibration levels by more than an order of magnitude. It will also demonstrate use of an artificial neural network to monitor system health without invasive instrumentation. The second NASA contract, begun in January 1998, will develop an active adaptive vibration reduction system to be integrated with the DOE-funded TDC convertors. Preliminary descriptions and specifications of the Stirling convertor design, as well as program status and plans, are included.

  12. Recycling of wasted energy : thermal to electrical energy conversion

    E-Print Network [OSTI]

    Lim, Hyuck

    2011-01-01T23:59:59.000Z

    various types of Stirling engine have been developed, whichThermogalvanic cell Stirling Engine ORC Internal Combustionof Sterling engine [17] year inventor Robert Stirling John

  13. Progress in Developing a New 5 Kilowatt Free-Piston Stirling Space Convertor

    SciTech Connect (OSTI)

    Brandhorst, Henry W. Jr.; Kirby, Raymond L. [Space Research Institute, 231 Leach Center, Auburn University, Auburn University, AL, 36849-5320 (United States); Chapman, Peter A. [Foster-Miller, Inc., 431 New Karner Rd., Albany, NY, USA 12205 (United States)

    2008-01-21T23:59:59.000Z

    The NASA Vision for Exploration of the Moon envisions a nuclear reactor coupled with a free-piston Stirling convertor at a power level of 30-40 kWe. In the 1990s, Mechanical Technology, Inc.'s Stirling Engine Systems Division (now a part of Foster-Miller, Inc.) developed a 25 kWe free piston Stirling Space Power Demonstrator Engine under the SP-100 program. This system consisted of two 12.5 kWe engines connected at their hot ends and mounted in tandem to cancel vibration. Recently, NASA and DoE have been developing dual 55 We and 80 We Stirling convertor systems for use with radioisotope heat sources. Total test times of all convertors in this effort exceed 120,000 hours. Recently, NASA began a new project with Auburn University to develop a 5 kWe, single convertor for use in the Lunar power system. Goals of this development program include a specific power in excess of 140 We/kg at the convertor level, lifetime in excess of five years and a control system that will safely manage the convertors in case of an emergency. Auburn University awarded a subcontract to Foster-Miller, Inc. to undertake development of the 5 kWe Stirling Convertor Assembly. The characteristics of the design along with progress in developing the system will be described.

  14. Low pressure high speed Stirling air engine. Final technical report

    SciTech Connect (OSTI)

    Ross, M.A.

    1980-06-16T23:59:59.000Z

    The purpose of this project was to design, construct and test a simple, appropriate technology low pressure, high speed, wood-fired Stirling air engine of 100 W output. The final design was a concentric piston/displacer engine of 454 in. bore and 1 in. stroke with a rhombic drive mechanism. The project engine was ultimately completed and tested, using a propane burner for all tests as a matter of convenience. The 100 W aim was exceeded, at atmospheric pressure, over a wide range of engine speed with the maximum power being 112 W at 1150 rpm. A pressure can was constructed to permit pressurization; however the grant funds were running out, and the only pressurized power test attempted was unsuccessful due to seal difficulties. This was a disappointment because numerous tests on the 4 cubic inch engine suggested power would be more than doubled with pressurization at 25 psig. A manifold was designed and constructed to permit operation of the engine over a standard No. 40 pot bellied stove. The engine was run successfully, but at reduced speed and power, over this stove. The project engine started out being rather noisy in operation, but modifications ultimately resulted in a very quiet engine. Various other difficulties and their solutions also are discussed. (LCL)

  15. Stirling engine or heat pump having an improved seal

    DOE Patents [OSTI]

    White, Maurice A. (2802 S. Everett Pl., Kennewick, WA 99337); Riggle, Peter (616 Fuller, Richland, WA 99352); Emigh, Stuart G. (67 Park St., Richland, WA 99352)

    1985-01-01T23:59:59.000Z

    A Stirling Engine or Heat Pump having two relatively movable machine elements for power transmission purposes includes a hermetic seal bellows interposed between the elements for separating a working gas from a pressure compensating liquid that balances pressure across the bellows to reduce bellows stress and to assure long bellows life. The volume of pressure compensating liquid displaced due to relative movement between the machine elements is minimized by enclosing the compensating liquid within a region exposed to portions of both machine elements at one axial end of a slidable interface presented between them by a clearance seal having an effective diameter of the seal bellows. Pressure equalization across the bellows is achieved by a separate hermetically sealed compensator including a movable enclosed bellows. The interior of the compensator bellows is in communication with one side of the seal bellows, and its exterior is in communication with the remaining side of the seal bellows. A buffer gas or additional liquid region can be provided at the remaining axial end of the clearnace seal, along with valved arrangements for makeup of liquid leakage through the clearance seal.

  16. Automotive Stirling-Engine Development Program. Semiannual technical progress report, July 1-December 31, 1981

    SciTech Connect (OSTI)

    Ernst, W.; Piller, S.; Richey, A.; Simetkosky, M.

    1982-09-01T23:59:59.000Z

    This is the first semiannual technical progress report prepared under the automotive Stirling Engine Development Program; it covers the fourteenth and fifteenth quarters of activity after award of the contract. Quarterly technical progress reports reported program activities from the first quarter through the thirteenth quarter; thereafter, reporting was changed to a semiannual format. This report summarizes activities performed on Mod I engine testing and test results, progress in manufacturing, assembling and testing of a Mod I engine in the United States, P-40 Stirling engine dynamometer and multifuels testing, analog/digital controls system testing, Stirling reference engine manufacturing and reduced size studies, components and subsystems, computer code development activities. The overall program philosophy is outlined, and data and results are presented.

  17. Comparison of steady-state and transient CVS cycle emissions of an automotive Stirling engine

    SciTech Connect (OSTI)

    Farrell, R.A.; Bolton, R.J.

    1983-01-01T23:59:59.000Z

    The Automotive Stirling Engine Development Program has stringent emission goals for a Stirling-powered vehicle. The present investigation is concerned with the initial development of a procedure for predicting transient CVS urban cycle gaseous emissions from steady-state engine data. Steady-state data from three Mod I automotive Stirling engines are used to predict urban CVS cycle emissions for a Mod I Lerma vehicle. Predicted data with respect to NOx emissions were found to correspond closely to measured values, while there were differences for the CO and HC data. Reasons for these differences are briefly discussed. Attention is given to the test procedure and the measurements, the engine test results, vehicle emissions predictions, and a comparison of vehicle results and steady-state predictions. 11 references.

  18. Assessment of a 40-kilowatt stirling engine for underground mining applications

    SciTech Connect (OSTI)

    Cairelli, J.E.; Kelm, G.G.; Slaby, J.G.

    1982-06-01T23:59:59.000Z

    An assessment of alternative power souces for underground mining applications was performed. A 40-kW Stirling research engine was tested to evaluate its performance and emission characteristics when operated with helium working gas and diesel fuel. The engine, the test facility, and the test procedures are described. Performance and emission data for the engine operating with helium working gas and diesel fuel are reported and compared with data obtained with hydrogen working gas and unleaded gasoline fuel. Helium diesel test results are compared with the characteristics of current diesel engines and other Stirling engines. External surface temperature data are also presented. Emission and temperature results are compared with the Federal requirements for diesel underground mine engines. The durability potential of Stirling engines is discussed on the basis of the experience gaind during the engine tests.

  19. Normal Ordering for Deformed Boson Operators and Operator-valued Deformed Stirling Numbers

    E-Print Network [OSTI]

    Jacob Katriel; Maurice Kibler

    2000-01-02T23:59:59.000Z

    The normal ordering formulae for powers of the boson number operator $\\hat{n}$ are extended to deformed bosons. It is found that for the `M-type' deformed bosons, which satisfy $a a^{\\dagger} - q a^{\\dagger} a = 1$, the extension involves a set of deformed Stirling numbers which replace the Stirling numbers occurring in the conventional case. On the other hand, the deformed Stirling numbers which have to be introduced in the case of the `P-type' deformed bosons, which satisfy $a a^{\\dagger} - q a^{\\dagger} a = q^{-\\hat{n}}$, are found to depend on the operator $\\hat{n}$. This distinction between the two types of deformed bosons is in harmony with earlier observations made in the context of a study of the extended Campbell-Baker-Hausdorff formula.

  20. A study on two-phase, two-component Stirling engine

    SciTech Connect (OSTI)

    Iwasaki, E.; Hirata, M.

    1982-08-01T23:59:59.000Z

    The characteristics of a Stirling engine of Freon(R-113)-Air mixture as a working fluid are studied. A small Stirling engine is designed. The engine rotates by itself only at some mixture ratio of Freon and air at a speed from 40 to 60 rpm when the temperature of the heater and cooler should be kept at 373K and 288K respectively. By using a Freon-Air mixture, the average heat transfer coefficient at the heater wall is improved by a factor of 10, compared with using air only. In addition, the power output is positive even in the compression space.

  1. Free-piston Stirling engine-driven heat pump program plan

    SciTech Connect (OSTI)

    Ross, B.A.; Hutchinson, R.A.; Chen, F.C.

    1988-07-01T23:59:59.000Z

    Stirling engine driven heat pumps are one of the most attractive potential products based on Stirling engines. Their many advantages in efficiency, fuel adaptability, quietness, compactness, controllability and potential for high reliability are well known. This paper briefly reviews these advantages, then turns to key technical concerns in Sterling engine driven heat pump development. These have been organized into an effective development program that will require about $4 million per year for 8 years to complete basic research, component development, and an estimated 3 generations of system hardware. The planning effort was directed by the Building Equipment Division of the DOE Office of Buildings and Communities Systems. 7 refs., 2 figs.

  2. Design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range. First quarterly report

    SciTech Connect (OSTI)

    Not Available,

    1980-01-07T23:59:59.000Z

    This project is Phase I of a multi-phased program for the design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range. Phase I comprises the conceptual design and associated cost estimates of a stationary Stirling engine capable of being fueled by a variety of heat sources, with emphasis on coal firing, followed by the preparation of a plan for implementing the design, fabrication and testing of a demonstration engine by 1985. The main effort in Phase I is the generation of state-of-the-art conceptual designs having greatest potential for prototype testing in 1985. The conceptual designs include a heat transport system for integrating the engine heater head with such energy sources as conventional oil/gas combustors, fluidized bed and other coal combustors, and combustors using coal-derived liquid fuels, and low/medium BTU gases. The heat transport systems being investigated include forced convection with gases or liquids, heat pipes, and direct firing. Currently, the leading choice for the solid fuel combustion system is the atmospheric fluidized bed, with low BTU gasification still a viable alternative. Both systems will continue to be evaluated further, but with greater emphasis on FBC. To date, there appears no clear choice among the heat pipe, forced convection gas loop, or direct firing as the prime candidate for the heat transport sub-system. Conceptual design and analysis will continue on all three sub-systems. Scale-up of United Stirling's P-75 engine to serve as the conceptual design of the 500 HP engine module is continuing. (LCL)

  3. The U.S. Department of Energy, National Nuclear Security Agency's Use of Geographic Information Systems for Nuclear Emergency Response Support

    SciTech Connect (OSTI)

    A. L. Guber

    2001-06-01T23:59:59.000Z

    The U.S, Department of Energy (DOE), National Nuclear Security Agency's (NNSA) Remote Sensing Laboratory (RSL) provides Geographic Information System (GIS) support during nuclear emergency response activities. As directed by the NNSA, the RSL GIS staff maintains databases and equipment for rapid field deployment during an emergency response. When on location, GIS operators provide information products to on-site emergency managers as well as to emergency managers at the DOE Headquarters (HQ) Emergency Operations Center (EOC) in Washington, D.C. Data products are derived from multiple information sources in the field including radiological prediction models, field measurements taken on the ground and from the air, and pertinent information researched on the Internet. The GIS functions as a central data hub where it supplies the information to response elements in the field, as well as to headquarters officials at HQ during emergency response activities.

  4. Estimated size and performance of a natural gas fired duplex Stirling for domestic refrigeration applications

    SciTech Connect (OSTI)

    Berchowitz, D.M. (Sunpower, Inc., Athens, OH (United States)); Shonder, J. (Oak Ridge National Lab., TN (United States))

    1991-01-01T23:59:59.000Z

    Calibrated calculations are used to size an integrated Stirling cooler and engine (Duplex configuration). Fuel for the engine is natural gas and the working fluid is helium. The potential exists for long life and low noise. Performance is shown to be very competitive when compared to standard vapor compression systems. 10 refs., 8 figs., 1 tab.

  5. Stirling Engine Natural Gas Combustion Demonstration Program. Final report, October 1989-January 1991

    SciTech Connect (OSTI)

    Ernst, W.; Moryl, J.; Riecke, G.

    1991-02-01T23:59:59.000Z

    Fueled on natural gas, the Stirling engine is an inherently clean, quiet, and efficient engine. With increasing environmental concern for air quality and the increasingly more stringent requirements for low engine exhaust emissions, the Stirling engine may be an attractive alternative to internal combustion (IC) engines. The study has demonstrated that ultra low emissions can be attained with a Stirling-engine-driven electric generator configured to burn natural gas. Combustion parameters were optimized to produce the lowest possible exhaust emissions for a flame-type combustor without compromising overall engine thermal efficiency. A market application survey and manufacturing cost analysis indicate that a market opportunity potentially exists in the volumes needed to economically manufacture a newly designed Stirling engine (Mod III) for stationary applications and hybrid vehicles. The translation of such potential markets into actual markets does, however, pose difficult challenges as substantial investments are required. Also, the general acceptance of a new engine type by purchasers requires a considerable amount of time.

  6. 25 kWe solar thermal stirling hydraulic engine system: Final conceptual design report

    SciTech Connect (OSTI)

    Not Available

    1988-01-01T23:59:59.000Z

    This report documents the conceptual design and analysis of a solar thermal free-piston Stirling hydraulic engine system designed to deliver 25 kWe when coupled to the 11-meter Test Bed Concentrator at Sandia National Laboratories. A manufacturing cost assessment for 10,000 units per year was made by Pioneer Engineering and Manufacturing. The design meets all program objectives including a 60,000-hr design life, dynamic balancing, fully automated control, >33.3% overall system efficiency, properly conditioned power, maximum utilization of annualized insolation, and projected production costs of $300/kW. The system incorporates a simple, rugged, reliable pool boiler reflux heat pipe to transfer heat from the solar receiver to the Stirling engine. The free-piston engine produces high-pressure hydraulic flow which powers a commercial hydraulic motor that, in turn, drives a commercial rotary induction generator. The Stirling hydraulic engine uses hermetic bellows seals to separate helium working gas from hydraulic fluid which provides hydrodynamic lubrication to all moving parts. Maximum utilization of highly refined, field proven commercial components for electric power generation minimizes development cost and risk. The engine design is based on a highly refined Stirling hydraulic engine developed over 20 years as a fully implantable artificial heart power source. 4 refs., 19 figs., 3 tabs.

  7. Stirling Engines for Low-Temperature Solar-Thermal-Electric Power Generation

    E-Print Network [OSTI]

    Sanders, Seth

    Stirling Engines for Low-Temperature Solar-Thermal- Electric Power Generation Artin Der Minassians Electrical Engineering and Computer Sciences University of California at Berkeley Technical Report No. UCB - Electrical Engineering and Computer Sciences in the GRADUATE DIVISION of the UNIVERSITY OF CALIFORNIA

  8. Pascal triangle, Stirling numbers and the unique invariance of the Euler characteristic

    E-Print Network [OSTI]

    Luzn, Ana

    2012-01-01T23:59:59.000Z

    We use some basic properties of binomial and Stirling numbers to prove that the Euler characteristic is, essentially, the unique numerical topological invariant for compact polyhedra which can be expressed as a linear combination of the numbers of faces of triangulations. We obtain this result converting it into an eigenvalue problem.

  9. Stirling engines. (Latest citations from the EI Compendex*plus database). Published Search

    SciTech Connect (OSTI)

    Not Available

    1994-04-01T23:59:59.000Z

    The bibliography contains citations concerning Stirling engine technology. Design, development, performance testing, and applications are discussed, including power generation, cryogenic cooling, solar power applications, and ground and marine vehicles. The citations also examine engine component design and material testing results. (Contains 250 citations and includes a subject term index and title list.)

  10. Eight interesting identities involving the exponential function, derivatives, and Stirling numbers of the second kind

    E-Print Network [OSTI]

    Qi, Feng

    2012-01-01T23:59:59.000Z

    In the paper, the author establishes some identities which show that the functions $\\frac1{(1-e^{\\pm t})^k}$ and the derivatives $\\bigl(\\frac1{e^{\\pm t}-1}\\bigr)^{(i)}$ can be expressed each other by linear combinations with coefficients involving the combinatorial numbers and the Stirling numbers of the second kind, where $t\

  11. Stirling engines. (Latest citations from the EI Compendex*plus database). Published Search

    SciTech Connect (OSTI)

    NONE

    1996-05-01T23:59:59.000Z

    The bibliography contains citations concerning Stirling engine technology. Design, development, performance testing, and applications are discussed, including power generation, cryogenic cooling, solar power applications, and ground and marine vehicles. The citations also examine engine component design and material testing results. (Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

  12. Stirling engines. (Latest citations from the EI Compendex*plus database). Published Search

    SciTech Connect (OSTI)

    NONE

    1995-02-01T23:59:59.000Z

    The bibliography contains citations concerning Stirling engine technology. Design, development, performance testing, and applications are discussed, including power generation, cryogenic cooling, solar power applications, and ground and marine vehicles. The citations also examine engine component design and material testing results. (Contains 250 citations and includes a subject term index and title list.)

  13. Start-up and control method and apparatus for resonant free piston Stirling engine

    DOE Patents [OSTI]

    Walsh, Michael M. (Schenectady, NY)

    1984-01-01T23:59:59.000Z

    A resonant free-piston Stirling engine having a new and improved start-up and control method and system. A displacer linear electrodynamic machine is provided having an armature secured to and movable with the displacer and having a stator supported by the Stirling engine housing in juxtaposition to the armature. A control excitation circuit is provided for electrically exciting the displacer linear electrodynamic machine with electrical excitation signals having substantially the same frequency as the desired frequency of operation of the Stirling engine. The excitation control circuit is designed so that it selectively and controllably causes the displacer electrodynamic machine to function either as a generator load to extract power from the displacer or the control circuit selectively can be operated to cause the displacer electrodynamic machine to operate as an electric drive motor to apply additional input power to the displacer in addition to the thermodynamic power feedback to the displacer whereby the displacer linear electrodynamic machine also is used in the electric drive motor mode as a means for initially starting the resonant free-piston Stirling engine.

  14. Feasibility Study of a Nuclear-Stirling Power Plant for the Jupiter Icy Moons Orbiter

    SciTech Connect (OSTI)

    Schmitz, Paul C. [Power Computing Solutions, Inc., Avon, OH 44011 (United States); Schreiber, Jeffrey G. [NASA Glenn Research Center at Lewis Field, MS 301-2, 21000 Brookpark Road, Cleveland, OH 44135 (United States); Penswick, L. Barry [L. Barry Penswick Consulting, Stevenson, WA 98648 (United States)

    2005-02-06T23:59:59.000Z

    NASA is undertaking the design of a new spacecraft to explore the planet Jupiter and its three moons Calisto, Ganymede and Europa. This proposed mission, known as Jupiter Icy Moons Orbiter (JIMO) would use a nuclear reactor and an associated electrical generation system (Reactor Power Plant - RPP) to provide power to the spacecraft. The JIMO spacecraft is envisioned to use this power for science and communications as well as Electric Propulsion (EP). Among other potential power-generating concepts, previous studies have considered Thermoelectric and Brayton power conversion systems, coupled to a liquid metal reactor for the JIMO mission. This paper will explore trades in system mass and radiator area for a nuclear reactor power conversion system, however this study will focus on Stirling power conversion. Stirling convertors have a long heritage operating in both power generation and the cooler industry, and are currently in use in a wide variety of applications. The Stirling convertor modeled in this study is based upon the Component Test Power Convertor design that was designed and operated successfully under the Civil Space Technology Initiative for use with the SP-100 nuclear reactor in the 1980's and early 1990's. The baseline RPP considered in this study consists of four dual-opposed Stirling convertors connected to the reactor by a liquid lithium loop. The study design is such that two of the four convertors would operate at any time to generate the 100 kWe while the others are held in reserve. For this study the Stirling convertors hot-side temperature is 1050 K, would operate at a temperature ratio of 2.4 for a minimum mass system and would have a system efficiency of 29%. The Stirling convertor would generate high voltage (400 volt), 100 Hz single phase AC that is supplied to the Power Management and Distribution system. The waste heat is removed from the Stirling convertors by a flowing liquid sodium-potassium eutectic and then rejected by a shared radiator. The radiator consists of two coplanar wings, which would be deployed after the reactor is in space. For this study design, the radiators would be located behind the conical radiation shield of the reactor and fan out as the radiator's distance from the reactor increases. System trades were performed to vary cycle state point temperatures and convertor design as well as power output. Other redundancy combinations were considered to understand the affects of convertor size and number of spares to the system mass.

  15. One- and two-dimensional Stirling machine simulation using experimentally generated reversing flow turbuulence models

    SciTech Connect (OSTI)

    Goldberg, L.F. [Univ. of Minnesota, Minneapolis, MN (United States)

    1990-08-01T23:59:59.000Z

    The activities described in this report do not constitute a continuum but rather a series of linked smaller investigations in the general area of one- and two-dimensional Stirling machine simulation. The initial impetus for these investigations was the development and construction of the Mechanical Engineering Test Rig (METR) under a grant awarded by NASA to Dr. Terry Simon at the Department of Mechanical Engineering, University of Minnesota. The purpose of the METR is to provide experimental data on oscillating turbulent flows in Stirling machine working fluid flow path components (heater, cooler, regenerator, etc.) with particular emphasis on laminar/turbulent flow transitions. Hence, the initial goals for the grant awarded by NASA were, broadly, to provide computer simulation backup for the design of the METR and to analyze the results produced. This was envisaged in two phases: First, to apply an existing one-dimensional Stirling machine simulation code to the METR and second, to adapt a two-dimensional fluid mechanics code which had been developed for simulating high Rayleigh number buoyant cavity flows to the METR. The key aspect of this latter component was the development of an appropriate turbulence model suitable for generalized application to Stirling simulation. A final-step was then to apply the two-dimensional code to an existing Stirling machine for which adequate experimental data exist. The work described herein was carried out over a period of three years on a part-time basis. Forty percent of the first year`s funding was provided as a match to the NASA funds by the Underground Space Center, University of Minnesota, which also made its computing facilities available to the project at no charge.

  16. Design and development of Stirling Engines for stationary power generation applications in the 500 to 3000 hp range. Subtask 1A report: state-of-the-art conceptual design

    SciTech Connect (OSTI)

    None

    1980-03-01T23:59:59.000Z

    The first portion of the Conceptual Design Study of Stirling Engines for Stationary Power Application in the 500 to 3000 hp range which was aimed at state-of-the-art stationary Stirling engines for a 1985 hardware demonstration is summarized. The main goals of this effort were to obtain reliable cost data for a stationary Stirling engine capable of meeting future needs for total energy/cogeneration sysems and to establish a pragmatic and conservative base design for a first generation hardware. Starting with an extensive screening effort, 4 engine types, i.e., V-type crank engine, radial engine, swashplate engine, and rhombic drive engine, and 3 heat transport systems, i.e., heat pipe, pressurized gas heat transport loop, and direct gas fired system, were selected. After a preliminary layout cycle, the rhombic drive engine was eliminated due to intolerable maintenance difficulties on the push rod seals. V, radial and swashplate engines were taken through a detailed design/layout cycle, to establish all important design features and reliable engine weights. After comparing engine layouts and analyzing qualitative and quantitative evaluation criteria, the V-crank engine was chosen as the candidate for a 1985 hardware demonstration.

  17. Reliability and optimization studies of nuclear and solar powered systems utilizing a Stirling engine for the space station

    E-Print Network [OSTI]

    Schmitz, Paul Charles

    1990-01-01T23:59:59.000Z

    RELIABILITY AND OPTIMIZATION STUDIES OF NUCLEAR AND SOLAR POWERED SYSTEMS UTILIZING A STIRLING ENGINE FOR THE SPACE STATION A Thesis by PAUL CHARLES SCHMITZ Submitted to the Office of Graduate Studies of Texas A&M University in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1990 Major Subject: Nuclear Engineering RELIABILITY AND OPTIMIZATION STUDIES OF NUCLEAR AND SOLAR POWERED SYSTEMS UTILIZING A STIRLING ENGINE FOR THE SPACE STATION A Thesis...

  18. HAS 222d/253e Energy & Environment P.B. Rhines, J. Wright, E.Lindahl, R.Koon

    E-Print Network [OSTI]

    in your car. E4 A Heat Engine: an engine using heated air to make mechanical energy, known as a Stirling engine, is quite efficient. Try to figure out how it

  19. An update of free-piston Stirling engine heat pump development

    SciTech Connect (OSTI)

    Ackermann, R.A.; Clinch, J.M.; Privon, G.T.

    1986-01-01T23:59:59.000Z

    A Free-Piston Stirling Engine Heat Pump (FPSE/HP) for residential applications has been under development for the past five years. The system consists of a natural gas combustor, free-piston Stirling engine, and a variable-stroke resonant piston refrigerant compressor. The compressor is linked to the engine via a unique hydraulic transmission that provides for both efficient power transfer and hermetic sealing between the engine working fluid (helium) and the compressor refrigerant. This development effort has led to a breadboard heat pump power module, engine/transmission/compressor, that has undergone a comprehensive test program to evaluate the performance of an FPSE/HP and to judge its potential for further development. The results obtained from this testing are presented in this paper.

  20. Effects of using a two-phase two-component working fluid in a Stirling engine

    SciTech Connect (OSTI)

    Renfroe, D.A.

    1983-08-01T23:59:59.000Z

    One of the major problems associated with Stirling engines has been their low power density. Traditional solutions to this problem have been to use high pressure hydrogen or helium as working fluids to increase the pressure excursion for a given temperature difference. This paper discusses a computer program which models a Stirling engine using a two-phase two-component (TPTC) working fluid used to improve power density. With the model the pressure, temperature, mass flux, heat transfer, work output, and amount of condensed water vs. vapor can be determined for any position in the engine and at any time. With the engine configuration described in the paper, the model indicated that the total power increased as water was added but the power factor decreased due to increased losses without substantial gains from the condensing/boiling mechanism of the two-phase fluid.

  1. Coupled thermodynamic-dynamic semi-analytical model of Free Piston Stirling engines

    E-Print Network [OSTI]

    Formosa, Fabien

    2013-01-01T23:59:59.000Z

    The study of free piston Stirling engine (FPSE) requires both accurate thermodynamic and dynamic modelling to predict its performances. The steady state behaviour of the engine partly relies on non linear dissipative phenomena such as pressure drop loss within heat exchangers which is dependant on the temperature within the associated components. An analytical thermodynamic model which encompasses the effectiveness and the flaws of the heat exchangers and the regenerator has been previously developed and validated. A semi-analytical dynamic model of FPSE is developed and presented in this paper. The thermodynamic model is used to define the thermal variables that are used in the dynamic model which evaluates the kinematic results. Thus, a coupled iterative strategy has been used to perform a global simulation. The global modelling approach has been validated using the experimental data available from the NASA RE-1000 Stirling engine prototype. The resulting coupled thermodynamic-dynamic model using a standard...

  2. Stirling Isotope Power System Program. Final report, January 1978-December 1980

    SciTech Connect (OSTI)

    Not Available

    1980-12-01T23:59:59.000Z

    The Stirling Isotope Power System (SIPS) design is discussed, including the control system and engine starter. The development, of fabrication, and testing of the SIPS converter are presented. The work performed on the Isotope Heat Source Assembly is described. The ancillary equipment, system integration and qualification, and safety are discussed. The safety discussion consists primarily of prediction of dose rates around the IHS and the influence on handling equipment design. Reliability and quality assurance are included. (MHR)

  3. Testing and performance characteristics of a 1-kW free piston Stirling engine

    SciTech Connect (OSTI)

    Schreiber, J.

    1983-04-01T23:59:59.000Z

    A 1 kW single cylinder free piston Stirling engine, configured as a research engine, was tested with helium working gas. The engine features a posted displacer and dashpot load. The test results show the engine power output and efficiency to be lower than those observed during acceptance tests by the manufacturer. Engine tests results are presented for operation at the two heater head temperatures and with two regenerator porosities, along with flow test results for the heat exchangers.

  4. Control scheme for power modulation of a free piston Stirling engine

    SciTech Connect (OSTI)

    Dhar, Manmohan (Schenectady, NY)

    1989-01-01T23:59:59.000Z

    The present invention relates to a control scheme for power modulation of a free-piston Stirling engine-linear alternator power generator system. The present invention includes connecting an autotransformer in series with a tuning capacitance between a linear alternator and a utility grid to maintain a constant displacement to piston stroke ratio and their relative phase angle over a wide range of operating conditions.

  5. Congruence classes of 2-adic valuations of Stirling numbers of the second kind

    E-Print Network [OSTI]

    Bennett, Curtis

    2012-01-01T23:59:59.000Z

    We analyze congruence classes of $S(n,k)$, the Stirling numbers of the second kind, modulo powers of 2. This analysis provides insight into a conjecture posed by Amdeberhan, Manna and Moll, which those authors established for $k\\le5$. We provide a framework that can be used to justify the conjecture by computational means, which we then complete for $k=5, 6,..., 20$.

  6. Dr. Stirling A. Colgate has been a staff physicist at Lawrence Livermore National Lab. (1952-1965) and was a staff member at Los Alamos National Laboratory, [LANL] from 1976 to 1991 and from

    E-Print Network [OSTI]

    Dr. Stirling A. Colgate has been a staff physicist at Lawrence Livermore National Lab. (1952 in WW II in the US Merchant Marine. Dr. Stirling A. Colgate is an associate staff member at Los Alamos

  7. The design, development and performance of a Duplex Stirling natural gas liquefier

    SciTech Connect (OSTI)

    Berchowitz, D.M.

    1982-09-01T23:59:59.000Z

    The idea of using a Duplex Stirling System for natural gas liquefaction has long been considered by Sunpower as an attractive application for Stirling engines. A few years ago an internally funded project was embarked upon to build a small demonstration Duplex Stirling unit. This machine was designed around the Model M-100 engine which was then being produced commercially. The demonstrator machine first ran in 1979 and soon proved to be a stable and reliable performer. A series of three further machines incorporating various improvements and modifications followed at which point it was confidently felt that the design of a large machine of more realistic capacity could be attempted. Work was started in August 1981 on the design and development of a preproduction natural gas liquefier with a capacity of at least 4 1/hr. The design of the larger machine borrows extensively from the experience gained from the small prototype machines. Scaling, computer simulation and optimization are used to refine the design. Presented here is a summary of the design and development of the preproduction machine.

  8. Effect of oxide films on hydrogen permeability of candidate Stirling heater head tube alloys

    SciTech Connect (OSTI)

    Schuon, S R; Misencik, J A

    1981-01-01T23:59:59.000Z

    High pressure hydrogen has been selected as the working fluid for the developmental automotive Stirling engine. Containment of the working fluid during operation of the engine at high temperatures and at high hydrogen gas pressures is essential for the acceptance of the Stirling engine as an alternative to the internal combustion engine. Most commercial alloys are extremely permeable to pure hydrogen at high temperatures. A program was undertaken at NASA Lewis Research Center (LeRC) to reduce hydrogen permeability in the Stirling engine heater head tubes by doping the hydrogen working fluid with CO or CO/sub 2/. Small additions of these gases were shown to form an oxide on the inside tube wall and thus reduce hydrogen permeability. A study of the effects of dopant concentration, alloy composition, and effects of surface oxides on hydrogen permeability in candidate heater head tube alloys is summarized. Results showed that hydrogen permeability was similar for iron-base alloys (N-155, A286, IN800, 19-9DL, and Nitronic 40), cobalt-base alloys (HS-188) and nickel-base alloys (IN718). In general, the permeability of the alloys decreased with increasing concentration of CO or CO/sub 2/ dopant, with increasing oxide thickness, and decreasing oxide porosity. At high levels of dopants, highly permeable liquid oxides formed on those alloys with greater than 50% Fe content. Furthermore, highly reactive minor alloying elements (Ti, Al, Nb, and La) had a strong influence on reducing hydrogen permeability.

  9. Experimental and Analytical Studies on Pyroelectric Waste Heat Energy Conversion

    E-Print Network [OSTI]

    Lee, Felix

    2012-01-01T23:59:59.000Z

    Rankine cycles and Stirling engines have been utilized to14, 15]. Particularly, Stirling engines have been used in a18]. Theoret- ically, Stirling engines can achieve Carnot e?

  10. Author's note: This article may use ideas you haven't learned yet, and might seem overly complicated. It is not. Understanding Stirling's formula is not for the faint of heart, and

    E-Print Network [OSTI]

    Schmuland, Byron

    complicated. It is not. Understanding Stirling's formula is not for the faint of heart, and requires 9! = 362880 10! = 3628800 Stirling's formula Factorials start off reasonably small, but by 10! we, there is a famous approximate formula, named after the Scottish mathematician James Stirling (1692-1770), that gives

  11. First offer University students and staff the opportunity to enjoy discounted fares on routes to and from the Stirling campus. Apply NOW for the FirstStudent ID card.

    E-Print Network [OSTI]

    Little, Tony

    to and from the Stirling campus. Apply NOW for the FirstStudent ID card. https year of study. With a valid University of Stirling student matriculation card, staff card or FirstStudent ID card, you can benefit from the following discounted fares between the University and Stirling city

  12. Keynes, R.J. and Stern, C.D. (1988) The development of neural segmentation in vertebrate embryos. In: The making of the nervous system. (J. Parnavelas, C.D. Stern and R.V. Stirling,

    E-Print Network [OSTI]

    Stern, Claudio

    1988-01-01T23:59:59.000Z

    . In: The making of the nervous system. (J. Parnavelas, C.D. Stern and R.V. Stirling, eds.). Oxford in vertebrate embryos. In: The making of the nervous system. (J. Parnavelas, C.D. Stern and R.V. Stirling, eds.V. Stirling, eds.). Oxford University Press pp. 84-100. #12;Keynes, R.J. and Stern, C.D. (1988

  13. Kenneth J. Turner. Template-based specification in LOTOS. Department of Computing Science and Mathematics, University of Stirling, Scotland, April 1993.

    E-Print Network [OSTI]

    Turner, Ken

    and Mathematics, University of Stirling, Scotland, April 1993. Template-Based Specification in LOTOS Kenneth J. Turner Department of Computing Science, University of Stirling, Scotland FK9 4LA Electronic Mail: kjt Engineering, except that the components in question are parts of specifications rather than re

  14. atomistic stirling engine: Topics by E-print Network

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

    engines can now utilize low grade heat sources for their operation ranging from passive solar or geothermal energy to industrial process waste heat. Whether Low temperature...

  15. Heat-pipe gas-combustion system endurance test for Stirling engine. Final report, May 1990-September 1990

    SciTech Connect (OSTI)

    Mahrle, P.

    1990-12-01T23:59:59.000Z

    Stirling Thermal Motors, Inc., (STM) has been developing a general purpose Heat Pipe Gas Combustion System (HPGC) suitable for use with the STM4-120 Stirling engine. The HPGC consists of a parallel plate recuperative preheater, a finned heat pipe evaporator and a film cooled gas combustor. A principal component of the HPGC is the heat pipe evaporator which collects and distributes the liquid sodium over the heat transfer surfaces. The liquid sodium evaporates and flows to the condensers where it delivers its latent heat. The report presents test results of endurance tests run on a Gas-Fired Stirling Engine (GFSE). Tests on a dynamometer test stand yielded 67 hours of engine operation at power levels over 10 kW (13.5 hp) with 26 hours at power levels above 15 kW (20 hp). Total testing of the engine, including both motoring tests and engine operation, yielded 245 hours of engine run time.

  16. Project Profile: Dish Stirling High-Performance Thermal Storage |

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

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010 | DepartmentEnergy MIT logoConcrete

  17. Materials technology assessment for a 1050 K Stirling Space Engine design

    SciTech Connect (OSTI)

    Scheuermann, C.M.; Dreshfield, R.L.; Gaydosh, D.J.; Kiser, J.D.; MacKay, R.A.; McDanels, D.L.; Petrasek, D.W.; Vannucci, R.D.; Bowles, K.J.; Watson, G.K.

    1988-10-01T23:59:59.000Z

    An assessment of materials technology and proposed materials selection was made for the 1050 K (superalloy) Stirling Space Engine design. The objectives of this assessment were to evaluate previously proposed materials selections, evaluate the current state-of-the-art materials, propose potential alternate materials selections and identify research and development efforts needed to provide materials that can meet the stringent system requirements. This assessment generally reaffirmed the choices made by the contractor; however, in many cases alternative choices were described and suggestions for needed materials and fabrication research and development were made.

  18. Initial test results from a prototype, 20 kW helium charged Stirling engine

    SciTech Connect (OSTI)

    Clarke, M.A.; Taylor, D.R.

    1984-08-01T23:59:59.000Z

    An alpha-configuration, helium charged Stirling engine with a predicted output of 20 kW indicated power has been developed by a British consortium of universities and industrial companies. The work performed by the Royal Naval Engineering College has been in computer assisted design and component testing, with future plans for full engine trials during 1984/85. The scope of this paper is to outline the data obtained during motoring trials of the engine block and crankcase assembly, together with details of modifications incorporated in the various components.

  19. Two-phase, two-component Stirling engine with controlled evaporation

    SciTech Connect (OSTI)

    West, C.D.

    1982-12-01T23:59:59.000Z

    In a Stirling-like engine, the specific power can be greatly increased by the use of a two-component, two-phase working fluid. Theory and experiments have indicated that a two- to threefold increase is easily attainable. This report shows that by controlling the rate at which the liquid is evaporated into the expansion cylinder, still larger increases may be achieved under quite reasonable operating conditions. Successful application of this principle would make it practicable to operate engines with moderate hot-end temperatures and perhaps even with the very low temperatures available from simple nontracking solar collectors.

  20. Combinatorial approach to generalized Bell and Stirling numbers and boson normal ordering problem

    E-Print Network [OSTI]

    M A Mendez; P Blasiak; K A Penson

    2005-05-24T23:59:59.000Z

    We consider the numbers arising in the problem of normal ordering of expressions in canonical boson creation and annihilation operators. We treat a general form of a boson string which is shown to be associated with generalizations of Stirling and Bell numbers. The recurrence relations and closed-form expressions (Dobiski-type formulas) are obtained for these quantities by both algebraic and combinatorial methods. By extensive use of methods of combinatorial analysis we prove the equivalence of the aforementioned problem to the enumeration of special families of graphs. This link provides a combinatorial interpretation of the numbers arising in this normal ordering problem.

  1. Generalized Stirling permutations and forests: Higher-order Eulerian and Ward numbers

    E-Print Network [OSTI]

    J. Fernando Barbero G.; Jess Salas; Eduardo J. S. Villaseor

    2014-05-05T23:59:59.000Z

    We consider a family of combinatorial problems related to generalized Stirling permutations with fixed number of ascents that can also be understood in terms of ordered trees and forests. They will be solved by introducing a three-parameter generalization of the well-known Eulerian numbers that will be studied in the framework of generating-function methods. By using a non-trivial involution, we map these generalized Eulerian numbers onto a family of generalized Ward numbers for which we also provide a combinatorial interpretation.

  2. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish Stirling Reliability Improvement and

  3. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish Stirling Reliability Improvement

  4. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish Stirling Reliability

  5. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish Stirling ReliabilityDisposal Tara

  6. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish Stirling ReliabilityDisposal

  7. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish Stirling ReliabilityDisposalTechnical

  8. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish Stirling ReliabilityDisposalTechnicalDual

  9. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish Stirling

  10. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECIS and UOP (a

  11. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECIS and UOP (aand

  12. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECIS and UOP

  13. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECIS and

  14. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECIS andEnabling

  15. Sandia Energy - EC Publications

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

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  16. Sandia Energy - EC Publications

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  17. Sandia Energy - EC Publications

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  18. Sandia Energy - EC Publications

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  19. Sandia Energy - EC Publications

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  20. Sandia Energy - EC Publications

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  1. PROCEEDINGS OF 1976 SUMMER WORKSHOP ON AN ENERGY EXTENSION SERVICE

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01T23:59:59.000Z

    Rankine Cycle and Stirling Cycle engines for commercial use.1, HEAT ENGINE HWY VEHICLE SYSTEM (DEVELOP STIRLING CYCLE

  2. Two-dimensional numerical simulation of a Stirling engine heat exchanger

    SciTech Connect (OSTI)

    Ibrahim, M.B. [Cleveland State Univ., OH (United States); Tew, R.C.; Dudenhoefer, J.E. [Lewis Research Center, Cleveland, OH (United States)

    1994-09-01T23:59:59.000Z

    This paper describes the first phase of an effort to develop multidimensional models of Stirling engine components; the ultimate goal is to model an entire engine working space. More specifically, this paper describes parallel plate and tubular heat exchanger models with emphasis on the central part of the channel (i.e., ignoring hydrodynamic and thermal end effects). The model assumes: Laminar, incompressible flow with constant thermophysical properties. In addition, a constant axial temperature gradient is imposed. The governing equations, describing the model, have been solved Crack-Nicloson finite-difference scheme. Model predictions have been compared with analytical solutions for oscillating/reversing flow and heat transfer in order to check numerical accuracy. The simplifying assumptions will later be relaxed to permit modeling of incompressible, laminar/turbulent flow that occurs in Stirling heat exchanger. Excellent agreement has been obtained for the model predictions with analytical solutions available for both flow in circular tubes and between parallel plates. Also the heat transfer computational results are in good agreement with the heat transfer analytical results for parallel plates.

  3. RE-1000 free-piston Stirling engine sensitivity test results. Final report

    SciTech Connect (OSTI)

    Schreiber, J.G.; Geng, S.M.; Lorenz, G.V.

    1986-10-01T23:59:59.000Z

    The NASA Lewis Research Center has been testing a 1 kW (1.33 hp) free-piston Stirling engine at the NASA Lewis test facilities. The tests performed over the past several years have been on a single cylinder machine known as the RE-1000. The data recorded were to aid in the investigation of the dynamics and thermodynamics of the free-piston Stirling engine. The data are intended to be used primarily for computer code validation. NASA reports TM-82999, TM-83407, and TM-87126 give initial results of the engine tests. The tests were designed to investigate the sensitivity of the engine performance to variations on the mean pressure of the working space, the working fluid used, heater and cooler temperatures, regenerator porosity, power piston mass and displacer dynamics. These tests have now been completed at NASA Lewis. This report presents some of the detailed data collected in the sensitivity tests. In all, 781 data points were recorded. A complete description of the engine and test facility is given. Many of the data can be found in tabular form, while a microfiche containing all of the data points can be requested from NASA Lewis.

  4. Nonlinear dynamics analysis of a membrane Stirling engine: Starting and stable operation

    E-Print Network [OSTI]

    Formosa, Fabien

    2013-01-01T23:59:59.000Z

    This paper presents the work devoted to the study of the operation of a miniaturized membrane Stirling engine. Indeed, such an engine relies on the dynamic coupling of the motion of two membranes to achieve a prime mover Stirling thermodynamic cycle. The modelling of the system introduces the large vibration amplitudes of the membrane as well as the nonlinear dissipative effects associated to the fluid flow within the engine. The nonlinearities are expressed as polynomial functions with quadratic and cubic terms. This paper displays the stability analysis to predict the starting of the engine and the instability problem which leads to the steady state behaviour. The centre manifold - normal form theory is used to obtain the simplest expression for the limit cycle amplitudes. The approach allows the reduction of the number of equations of the original system in order to obtain a simplified system, without loosing the dynamics of the original system as well as the contributions of non-linear terms. The model in...

  5. Dynamically balanced, hydraulically driven compressor/pump apparatus for resonant free piston Stirling engines

    DOE Patents [OSTI]

    Corey, John A. (North Troy, NY)

    1984-05-29T23:59:59.000Z

    A compressor, pump, or alternator apparatus is designed for use with a resonant free piston Stirling engine so as to isolate apparatus fluid from the periodically pressurized working fluid of the Stirling engine. The apparatus housing has a first side closed by a power coupling flexible diaphragm (the engine working member) and a second side closed by a flexible diaphragm gas spring. A reciprocally movable piston is disposed in a transverse cylinder in the housing and moves substantially at right angles relative to the flexible diaphragms. An incompressible fluid fills the housing which is divided into two separate chambers by suitable ports. One chamber provides fluid coupling between the power diaphragm of the RFPSE and the piston and the second chamber provides fluid coupling between the gas spring diaphragm and the opposite side of the piston. The working members of a gas compressor, pump, or alternator are driven by the piston. Sealing and wearing parts of the apparatus are mounted at the external ends of the transverse cylinder in a double acting arrangement for accessibility. An annular counterweight is mounted externally of the reciprocally movable piston and is driven by incompressible fluid coupling in a direction opposite to the piston so as to damp out transverse vibrations.

  6. The Development of a Control System for a 5 Kilowatt Free Piston Stirling Space Convertor

    SciTech Connect (OSTI)

    Kirby, Raymond L. [Space Research Institute, 231 Leach Center, Auburn University, Auburn University, AL, USA 36849-5320 (United States); Vitale, N. [Foster-Miller, Inc., 431 New Karner Rd., Albany, NY, USA 12205 (United States)

    2008-01-21T23:59:59.000Z

    The new NASA Vision for Exploration, announced by President Bush in January 2004, proposes an ambitious program that plans to return astronauts to the moon by the 2018 time frame. A recent NASA study entitled 'Affordable Fission Surface Power Study' recommended a 40 kWe, 900 K, NaK-cooled, Stirling conversion for 2020 launch. Use of two of the nominal 5 kW converters allows the system to be dynamically balanced. A group of four dual-converter combinations that would yield 40 kWe can be tested to validate the viability of Stirling technology for space fission surface power systems. The work described in this paper deals specifically with the control system for the 5 kW convertor described in the preceding paragraph. This control system is responsible for maintaining piston stroke to a setpoint in the presence of various disturbances including electrical load variations. Pulse starting of the FSPE convertor is also an inherent part of such a control system. Finally, the ability to throttle the engine to match the required output power is discussed in terms of setpoint control. Several novel ideas have been incorporated into the piston stroke control strategy that will engender a stable response to disturbances in the presence of midpoint drift while providing useful data regarding the position of both the power piston and displacer.

  7. Creep-rupture and fractographic analysis of candidate Stirling engine superalloys tested in air

    SciTech Connect (OSTI)

    Bhattachryya, S.

    1984-03-01T23:59:59.000Z

    The creep-rupture behavior of six candidate Stirling engine iron-base superalloys was determined in air. The alloys tested included four wrought alloys (A-286, INCOLOY Alloy 800H, N-155, and 19-9DL) and two cast alloys (CRM-6D and XF-818). The wrought alloys were evaluated in the form of sheet; the cast alloy specimens were investment cast to shape. The creep-rupture specimens were tested in air for up to 3000 hours over the temperature range 650/sup 0/ to 925/sup 0/C. Microstructural and fractographic aspects of the ruptured specimens are discussed with a few correlational graphical analyses included for XF-818 and 19-9DL. Tests are continuing in 15 MPa hydrogen, and later these data will be correlated with air data and microstructural analysis of the specimens conducted.

  8. Superfluid stirling refrigerator: A new method for cooling below 1 Kelvin

    SciTech Connect (OSTI)

    Kotsubo, V.; Swift, G.W.

    1990-01-01T23:59:59.000Z

    We have invented and built a new type of cryocooler, which we call the superfluid Stirling refrigerator (SSR). The first prototype reached 0.6 K from a starting temperature of 1.2 K. The working fluid of the SSR is the {sup 3}He solute in a superfluid {sup 3}He--{sup 4}He solution. At low temperatures, the superfluid {sup 4}He is in its quantum ground state, and therefore is thermodynamically inert, while the {sup 3}He solute has the thermodynamic properties of a dense ideal gas. Thus, in principle, any refrigeration cycle that can use an ideal gas can also use the {sup 3}He solute as working fluid. In our SSR prototype, bellows-sealed superleak pistons driven by a room-temperature camshaft work on the {sup 3}He solute. Ultimately, we anticipate elimination of moving parts by analogy with pulse-tube refrigeration. 15 refs., 6 figs.

  9. Breadboard development of a hydraulically coupled Free Piston Stirling Engine heat pump compressor

    SciTech Connect (OSTI)

    Marusak, T.J.

    1984-01-01T23:59:59.000Z

    For more than a decade the Free Piston Stirling Engine (FPSE) has been considered as an attractive candidate for a thermally activated heat pump because of its potential for high efficiency coupled with long life and high reliability. The distinguishing features of the FPSE, one moving part and hermetic separation of the power cycle and refrigeration cycle working fluids, makes it ideally suited for a heat pump application. However, two major design challenges have kept the FPSE in the realm of laboratory rather than product development. Specifically, these challenges involve; effective control of a tuned resonant system over a wide range of loads and hermetic coupling of the driver and driven mechanical members. 8 figs., 1 tab.

  10. Study on a two-piston type Stirling engine MELSE II -- Analysis of engine performance --

    SciTech Connect (OSTI)

    Azotsu, A.; Tanaka, A.; Yamada, Y.; Yamashita, I.; Yanagihara, S.

    1984-08-01T23:59:59.000Z

    This paper describes the results of performance test data of the two-piston type laboratory research Stirling engine MELSE II. On the basis of the experimental data, the effects of the working gas species and the phase difference between the two pistons on engine performance are discussed and made clear. As working gases, helium, neon and argon were used. Phase difference was changed from 60 to 150 degrees. These effects appear mainly as the distinctions of the pressure drop loss and the mean working gas temperature in the expansion cylinder, and depend significantly on the engine speed. In addition, the pressure difference between the two cylinders and the temperature distribution of the expansion cylinder wall have been measured, and their behaviors are clarified in relation to the effects mentioned just above.

  11. Application of advanced Stirling engine technology to a commercial size gas-fired heat pump

    SciTech Connect (OSTI)

    Johansson, L.; Agno, J.; Wurm, J.

    1985-08-01T23:59:59.000Z

    The Gas Research Institute sponsored work on the kinematic Stirling engine-driven heat pump, which offers practical improvements in the use of natural gas. Results from the first phase of the program led to the selection of a method of introducing low pressure natural gas into the V160 engine's combustor and testing of the ejector system. Further engine modifications will be needed as well as demonstrations of the performance and reliability of the units. The first phase found all developmental needs to be achievable, making the concept technically feasible. Computer projections based on the system performance of components indicate the gas-fired pump will work better than electric models and be economically feasible as well. 5 figures, 1 table.

  12. Mass transport, corrosion, plugging, and their reduction in solar dish/Stirling heat pipe receivers

    SciTech Connect (OSTI)

    Adkins, D.R.; Andraka, C.E.; Bradshaw, R.W.; Goods, S.H.; Moreno, J.B.; Moss, T.A.

    1996-07-01T23:59:59.000Z

    Solar dish/Stirling systems using sodium heat pipe receivers are being developed by industry and government laboratories here and abroad. The unique demands of this application lead to heat pipe wicks with very large surface areas and complex three-dimensional flow patterns. These characteristics can enhance the mass transport and concentration of constituents of the wick material, resulting in wick corrosion and plugging. As the test times for heat pipe receivers lengthen, we are beginning to see these effects both indirectly, as they affect performance, and directly in post-test examinations. We are also beginning to develop corrective measures. In this paper, we report on our test experiences, our post-test examinations, and on our initial effort to ameliorate various problems.

  13. Alloy chemistry and microstructural control to meet the demands of the automotive Stirling engine

    SciTech Connect (OSTI)

    Stephens, J.R.

    1986-01-01T23:59:59.000Z

    The automotive Stirling engine now under development by DOE/NASA as an alternative to the internal combustion engine, imposes severe materials requirements for the hot portion of the engine. Materials selected must be low cost and contain a minimum of strategic elements so that availability is not a problem. Heater head tubes contain high pressure hydrogen on the inside and are exposed to hot combustion gases on the outside surface. The cylinders and regenerator housings must be readily castable into complex shapes having varying wall thicknesses and be amenable to brazing and welding operations. Also, high strength, oxidation resistance, resistance to hydrogen permeation, cyclic operation, and long-life are required. A research program conducted by NASA Lewis focused on alloy chemistry and microstructural control to achieve the desired properties over the life of the engine. Results of alloy selection, characterization, evaluation, and actual engine testing of selected materials will be presented.

  14. Creep-rupture behavior of six candidate Stirling engine superalloys tested in air

    SciTech Connect (OSTI)

    Bhattacharyya, S.

    1984-01-01T23:59:59.000Z

    The creep-rupture behavior of six candidate Stirling engine iron-base superalloys was determined in air. The alloys included four wrought alloys (A-286, Alloy 800H, N-155, and 19-9DL) and two cast alloys (CRM-6D and XF-818). The specimens were tested to rupture for times up to 3000 h at 650/sup 0/ to 925/sup 0/C. Rupture life (t /SUB r/ ), minimum creep rate (epsilon /SUB m/ ), and time to 1 percent creep strain (t /SUB 1/100/ ) were statistically analyzed as a function of stress and temperature. Estimated stress levels at different temperatures to obtain 3500 h t /SUB r/ and t /SUB 1/100/ lives were determined. These data will be compared with similar data being obtained under 15 MPa hydrogen.

  15. Independently variable phase and stroke control for a double acting Stirling engine

    DOE Patents [OSTI]

    Berchowitz, David M. (Scotia, NY)

    1983-01-01T23:59:59.000Z

    A phase and stroke control apparatus for the pistons of a Stirling engine includes a ring on the end of each piston rod in which a pair of eccentrics is arranged in series, torque transmitting relationship. The outer eccentric is rotatably mounted in the ring and is rotated by the orbiting ring; the inner eccentric is mounted on an output shaft. The two eccentrics are mounted for rotation together within the ring during normal operation. A device is provided for rotating one eccentric with respect to another to change the effective eccentricity of the pair of eccentrics. A separately controlled phase adjustment is provided to null the phase change introduced by the change in the orientation of the outer eccentric, and also to enable the phase of the pistons to be changed independently of the stroke change.

  16. Demonstration experiments for solid state physics using a table top mechanical Stirling refrigerator

    E-Print Network [OSTI]

    Osorio, M R; Rodrigo, J G; Suderow, H; Vieira, S; 10.1088/0143-0807/33/4/757

    2012-01-01T23:59:59.000Z

    Liquid free cryogenic devices are acquiring importance in basic science and engineering. But they can also lead to improvements in teaching low temperature an solid state physics to graduate students and specialists. Most of the devices are relatively expensive, but small sized equipment is slowly becoming available. Here, we have designed several simple experiments which can be performed using a small Stirling refrigerator. We discuss the measurement of the critical current and temperature of a bulk YBa2Cu3O(7-d) (YBCO) sample, the observation of the levitation of a magnet over a YBCO disk when cooled below the critical temperature and the observation of a phase transition using ac calorimetry. The equipment can be easily handled by students, and also used to teach the principles of liquid free cooling.

  17. Feasibility of Achieving a Zero-Net-Energy, Zero-Net-Cost Homes

    E-Print Network [OSTI]

    Al-Beaini, S.

    2010-01-01T23:59:59.000Z

    electricoptions(solar?dishstirlingengines,fuelcells,yield)include:solar?dishStirlingengines,fuelcells,

  18. Feasibility of Achieving a Zero-Net-Energy, Zero-Net-Cost Homes

    E-Print Network [OSTI]

    Al-Beaini, S.

    2010-01-01T23:59:59.000Z

    options(solar?dishstirlingengines,fuelcells,andinclude:solar?dishStirlingengines,fuelcells,and

  19. Heat transfer from combustion gases to a single row of closely spaced tubes in a swirl crossflow Stirling engine heater

    SciTech Connect (OSTI)

    Bankston, C.P.; Back, L.H.

    1982-02-01T23:59:59.000Z

    This paper describes an experimental program to determine the heat-transfer characteristics of a combustor and heat-exchange system in a hybrid solar receiver which utilizes a Stirling engine. The system consists of a swirl conbustor with a crossflow heat exchanger composed of a single row of 48 closely spaced curved tubes. In the present study, heat-transfer characteristics of the combustor/heat-exchanger system without a Stirling engine have been studied over a range of operating conditions and output levels using water as the working fluid. Non-dimensional heat-transfer coefficients based on total heat transfer have been obtained and are compared with available literature data. The results show significantly enhanced heat transfer for the present geometry and test conditions. Also, heat transfer along the length of the tubes is found to vary, the effect depending upon test condition.

  20. Development of a quiet Stirling cycle multi-fuel engine for electric power generation. Final report Feb-Aug 82

    SciTech Connect (OSTI)

    Mercer, J.E.; Emigh, S.G.; Riggle, P.; Tremoulet, O.L.; White, M.A.

    1982-08-01T23:59:59.000Z

    The work described in this report summarizes a six-month study to develop a lightweight, tactical electric power plant with a low level of aural, I. R., and visual detectability, based on a Stirling engine. The conceptual design presented was analyzed and predicted to have power output qualities exceeding those specified by the Army for tactical generators. The unit promises to have maintenance and overhaul requirement characteristics superior to any generator system in current use.

  1. DEVELOPMENT OF A 4 K STIRLING-TYPE PULSE TUBE CRYOCOOLER FOR A MOBILE TERAHERTZ DETECTION SYSTEM

    SciTech Connect (OSTI)

    Bradley, P. E.; Gerecht, E.; Radebaugh, R. [National Institute of Standards and Technology, Boulder, Colorado, 80305 (United States); Garaway, I. [National Institute of Standards and Technology, Boulder, Colorado, 80305 (United States); Technion-Israel Institute of Technology, Haifa (Israel)

    2010-04-09T23:59:59.000Z

    We discuss in this paper the design and development of a 4 K Stirling-type pulse tube cryocooler for a mobile terahertz detection system. This system integrates new heterodyne detector technology at terahertz frequencies with advancements of Stirling-type pulse tube technology that brings the advent of cooled detector sensitivities in a mobile, compact, and long duration operation system without degradation of sensitivity. To achieve this goal we reduced overall system size, input power, and temperature fluctuations and mechanical vibrations in order to maintain the detector sensitivity. The Stirling-type pulse tube cryocooler developed for this system is a hybrid design employing a He-4 pulse-tube cryocooler operating at 60 Hz and 2.5 MPa average pressure that precools a He-3 pulse tube cryocooler operating at 30 Hz and 1.0 MPa average pressure to achieve 4 K cooling for the terahertz receiver. The He-4 cryocooler employs stainless steel mesh regenerators for the first stage and ErPr spheres for the second stage, while the He-3 cryocooler employs stainless mesh for the first stage and ErPr spheres for the second stage with a layered rare-earth third stage regenerator. Design details and cooler performance goals are discussed.

  2. ------~~~T~~"~cr~~s~-~~a-r~~~C-~~:~"'4r:~~~?4F~~n-I~~~U i~)-----`----------------r~~~t' 1O NCOT T MATCHING OF A FREE PISTON STIRLING ENGINE COUPLED WITH A FREE

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    ~~~t' 789272 1O NCOT T MATCHING OF A FREE PISTON STIRLING ENGINE COUPLED WITH A FREE REWPOVP PISTON LINEAR simplicity, lack of seals, and elimination of oil lubrication, a Free Piston Stirling Engine coupled, and hermetically sealed load feature, a free piston Stirling engine (Reference 2), driving a free piston linear

  3. Ris International Energy Conference, 2003 Ulf Hansen, Rostock University

    E-Print Network [OSTI]

    sustainable NPP for energy supply is 6 Gt/a equivalent to 2.5 billion ton of oil in addition 0.5 btoe from Combustion Biogas Thermo- chemical Liquefaction Pyrolysis Gas Cleaning Combustion Filtering Gas Heater Steam Generator Steam Engine Steam Turbine Stirling Engine Hot Air Turbine Combustion Engine Gas Turbine Fuel

  4. 3kW Stirling engine for power and heat production

    SciTech Connect (OSTI)

    Thorsen, J.E.; Bovin, J.; Carlsen, H. [Technical Univ. of Denmark, Lyngby (Denmark). Inst. of Energy Engineering

    1996-12-31T23:59:59.000Z

    A new 3 kW Beta type Stirling engine has been developed. The engine uses Natural gas as fuel, and it is designed for use as a small combined heat and power plant for single family houses. The electrical power is supplied to the grid. The engine is made as a hermetic device, where the crank mechanism and the alternator are built into a pressurized crank casing. The engine produce 3 kW of shaft power corresponding to 2.4 kW of electric power. The heat input is 10 kW corresponding to a shaft efficiency of 30%, and an electric efficiency of 24%. Helium at 8 MPa mean pressure is used as working gas. The crank mechanism is a combination of an upper- and lower yoke, each forming the half of a Ross mechanism. The upper yoke is linked to the displacer piston and the lower yoke is linked to the working piston. The design gives an approximately linear couple point curve, which eliminates guiding forces on the pistons and the need for X-heads. Grease lubricated needle and ball bearings are used in the kinematic crank mechanism. The burner includes an air preheater and a water jacket, which makes it possible to utilize nearly all of the heat from the combustion gases. The performance of the engine has been tested as a function of mean pressure and hot and cold temperature, and emissions and noise have been measured.

  5. Technology assessment of external heat systems for Stirling heat pumps. Final report

    SciTech Connect (OSTI)

    Vasilakis, A.D. [Advanced Mechanical Technology, Inc., Newton, MA (United States)

    1993-12-01T23:59:59.000Z

    A technology assessment and design improvement effort was undertaken for the Stirling engine heat pump external heat system (EHS) in order to reduce costs. It was found that only two applicable EHS design approaches have been developed to any extent: a relatively undeveloped design featuring a premixed fuel and air transpiration burner, and a turbulent diffusion type burner system developed by Mechanical Technology, Inc. To evaluate and optimize the design concepts, an analytical model was developed that examined design and performance variables. The model calculated key temperatures, allowing the specification of materials requirements. Adherence to American National Standards Institute appliance furnace code material specifications was assumed. Concepts for EHS control systems were evaluated, and a cost-effective control system design was developed for the turbulent diffusion burner EHS. The study reveals that optimizing the diffusion burner EHS design can result in significant cost savings. No clear choice between the diffusion burner and transpiration burner systems could be determined from this study, but the designs of both were further developed and improved. Estimates show the EHS based on a transpiration burner to have a manufactured cost that is roughly 70% of the turbulent diffusion burner EHS cost, but fuel efficiency is lower by about 18%.

  6. Evaluation of candidate stirling engine heater tube alloys for 1000 hours at 760/sup 0/C

    SciTech Connect (OSTI)

    Misencik, J.A.

    1980-11-01T23:59:59.000Z

    Six tubing alloys were endurance tested in a diesel-fired, Stirling engine simulator materials test rig for 1000 hours at 760/sup 0/C while pressurized at 17 to 21 MPa with either hydrogen or helium. The alloys tested were N-155, A-286, Incoloy 800, 19-9DL, Nitronic 40, and 316 stainless steel. All alloys were in the form of tubing with an outside diameter of 4.8 mm and a wall thickness of 0.8 mm. Hydrogen permeated rapidly through the walls of all six alloys when they were heated to 760/sup 0/C, and repressurization was required every 5 hours during rig testing. In contrast, helium was readily contained. Creep-rupture failures occurred in four of the six alloys pressurized with heluim and in two of the six alloys pressurized with hydrogen. Only two alloys survived the 1000-h endurance test with no failure, N-155 and 316 stainless steel. Stimulaneous exposure to either hydrogen or helium and the combustion environment at 21 MPa and 760/sup 0/C did not seriously degrade the tensile strength of the six alloys in tests at room temperature and 760/sup 0/C after exposure. Decreases in room-temperature ductility were noted and are attributed to aging rather than to hydrogen embrittlement or oxidation in three of the alloys. However, there may be a hydrogen embrittlement effect in the N-155, 19-9DL, and Nitronic 40 alloys.

  7. Multi-bottle, no compressor, mean pressure control system for a Stirling engine

    DOE Patents [OSTI]

    Corey, John A. (Melrose, NY)

    1990-01-01T23:59:59.000Z

    The invention relates to an apparatus for mean pressure control of a Stirling engine without the need for a compressor. The invention includes a multi-tank system in which there is at least one high pressure level tank and one low pressure level tank wherein gas flows through a maximum pressure and supply line from the engine to the high pressure tank when a first valve is opened until the maximum pressure of the engine drops below that of the high pressure tank opening an inlet regulator to permit gas flow from the engine to the low pressure tank. When gas flows toward the engine it flows through the minimum pressure supply line 2 when a second valve is opened from the low pressure tank until the tank reaches the engine's minimum pressure level at which time the outlet regulator opens permitting gas to be supplied from the high pressure tank to the engine. Check valves between the two tanks prevent any backflow of gas from occurring.

  8. Stockholm, Sweden: Energy Resources | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with formSoutheastern IL Elec Coop,Lanka-DLRStandardStaxeraEthanolStirlingSweden:

  9. Alternative Energy Development and China's Energy Future

    E-Print Network [OSTI]

    Zheng, Nina

    2012-01-01T23:59:59.000Z

    dish stirling technology with a parabolic reflector, China has only recently started exploring small-scale solardish/stirling engines and line- focusing Fresnel reflect systems (Wang, 2010). 2.5 Remaining Challenges to Solar

  10. Duplex Stirling gas-fired heat pump. Phase 2. Breadboard demonstration. Final report, May 1981-November 1982

    SciTech Connect (OSTI)

    Gedeon, D.; Penswick, B.; Beale, W.

    1982-11-01T23:59:59.000Z

    This program represents the first attempt to design, fabricate, and test a breadboard gas-fired duplex Stirling heat pump in a heating only mode. The system was designed to obtain a COP of 1.5 at an ambient temperature of 17F and have an output sufficient for an average residential home. The design methodology, detailed system description and test results for sub components and the entire system are discussed. Technical problems encountered in the program, and recommendations for further efforts are detailed.

  11. Pool boiler reflux solar receiver for Stirling dish-electric systems

    SciTech Connect (OSTI)

    Andraka, C.E.; Moreno, J.B.

    1989-01-01T23:59:59.000Z

    The feasibility of competitive, modular bulk electric power from the sun may be greatly enhanced by the use of a reflux heat pipe receiver to combine a heat engine such as Stirling with a paraboloidal dish concentrator. This combination represents a potential improvement over previous successful demonstrations of dish-electric technology in terms of enhanced performance, lower cost, longer life, and greater flexibility in engine design. There are, however, important issues and unknowns which must be addressed to determine engineering feasibility of these devices. In the pool boiler reflux receiver, concentrated solar radiation causes liquid metal (sodium or potassium) to boil. The vapor flows to the engine heater heads, where it condenses and releases the latent heat. The condensate is returned to the receiver absorber pool by gravity (refluxing). This is essentially an adaptation of heat pipe technology to the peculiar requirements of concentrated solar flux, and provides many advantages over conventional heated tube receiver technology. Boiling theory indicates that long-term stable boiling of liquid metal may be difficult to achieve. Laboratory scale experiments have been performed. Initial tests confirmed that boiling is unstable in a baseline boiler. Boiling stability was established after the addition of ''artificial cavities'' to the heated surface, and successful boiling of sodium was demonstrated for 100 hours. Other stabilizing influences may have been present, and will be discussed. The flux and geometry closely simulated a real receiver. The results of these tests are presented, along with the design of a full scale receiver for on-sun testing and considerations for long term operation. 15 refs., 10 figs.

  12. Sandia Energy - EC Publications

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

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  1. Sandia Energy - EC Publications

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  8. Sandia Energy - EC Publications

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    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECISEnergy-Water Analysis of.pdf

  9. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECISEnergy-Water AnalysisES-Select

  10. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECISEnergy-WaterPlant (WIPP)Tara

  11. Sandia Energy - EC Publications

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245CCrosstalk NuisanceDish StirlingECISEnergy-WaterPlantEstimation of

  12. Phase I-B development of kinematic Stirling/Rankine commercial gas-fired heat-pump system. Final report, September 1983-December 1985

    SciTech Connect (OSTI)

    Monahan, R.E.

    1986-07-01T23:59:59.000Z

    The Kinematic Stirling/Rankine gas heat pump concept is based on the application of a Stirling engine that has been under development for over a decade. The engine has been converted to natural gas and is characterized with many thousand hours of operating experience. The goal of the project is to develop a commercial-size Stirling engine-driven gas heat pump with a cooling capacity of 10-ton, and a COP (heating) of 1.8 and COP (cooling) of 1.1. The project is a multi-phase development with commercialization planned for 1989. In this phase, an HVAC systems manufacturer (Borg-Warner) is working with SPS to develop a prototype gas-heat-pump system. To date, a piston-type open-shaft refrigeration compressor was selected as the best match for the engine. Both the engine and compressor have been tested and characterized by performance maps, and the experimental heat-pump systems designed, built, and preliminary testing performed. Close agreement with computer model output has been achieved. SPS has continued to focus on improving the Stirling-engine performance and reliability for the gas-heat-pump application.

  13. Thermo-Fluids, Energy Systems and Environment This group conducts research in the following areas

    E-Print Network [OSTI]

    Calgary, University of

    and Reacting Flows l Aerodynamics l Internal-Combustion Engines l Stirling Engines l Computational Fluid internal-combustion engines l Cross-flow and co-flow combustion facilities l Flammability test apparatus l-Fluids, Energy Systems and Environment This group conducts research in the following areas: l Combustion

  14. 1 DECEMBER 2006 VOL 314 SCIENCE www.sciencemag.org1388 Energy and Resources Group (ERG), University of California at

    E-Print Network [OSTI]

    Ross-Ibarra, Jeffrey

    Australia, Stirling Highway, Crawley, Western Australia 6009, Australia. References 1. J. L. Bouzat1 DECEMBER 2006 VOL 314 SCIENCE www.sciencemag.org1388 LETTERS Energy and Resources Group (ERG- cations of mtDNA in conservation. OLIVER F. BERRY School of Animal Biology, University of Western

  15. Stochastic Energy Deployment System (SEDS) | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with formSoutheastern IL Elec Coop,Lanka-DLRStandardStaxeraEthanolStirling

  16. Design and development of Stirling engines for stationary-power-generation applications in the 500- to 3000-hp range. Phase I final report

    SciTech Connect (OSTI)

    None

    1980-10-01T23:59:59.000Z

    The first phase of the design and development of Stirling engines for stationary power generation applications in the 373 kW (500 hp) to 2237 kW (3000 hp) range was completed. The tasks in Phase I include conceptual designs of large Stirling cycle stationary engines and program plan for implementing Phases II through V. Four different heater head designs and five different machine designs were prepared in sufficient detail to select a design recommended for development in the near future. A second order analysis was developed for examining the various loss mechanisms in the Stirling engine and for predicting the thermodynamic performance of these engines. The predicted engine thermal brake efficiency excluding combustion efficiency is approximately 42% which exceeds the design objective of 40%. The combustion system designs were prepared for both a clean fuel combustion system and a two-stage atmospheric fluidized bed combustion system. The calculated combustion efficiency of the former is 90% and of the latter is 80%. Heat transport systems, i.e., a heat exchanger for the clean fuel combustion system and a sodium heat pipe system for coal and other nonclean fuel combustion systems were selected. The cost analysis showed that for clean fuels combustion the proposed 2237 kW (3000 hp) system production cost is $478,242 or $214/kW ($159/hp) which is approximately 1.86 times the cost of a comparable size diesel engine. For solid coal combustion the proposed 2237 kW (3000 hp) system production cost is approximately $2,246,242 which corresponds to a cost to power capacity ratio of $1004/kW ($749/hp). The two-stage atmospheric fluidized bed combustion system represents 81% of the total cost; the engine represents 14% depending on the future price differential between coal and conventional clean fuels, a short payback period of the proposed Stirling cycle engine/FBC system may justify the initial cost. (LCL)

  17. The Cascade of Tidal Energy from Low to High Modes on a Continental Slope SAMUEL M. KELLY* AND JONATHAN D. NASH

    E-Print Network [OSTI]

    affiliation: University of Western Australia, Crawley, Australia. Corresponding author address: Samuel M. Kelly, University of Western Australia, M015 SESE, 35 Stirling Hwy., Crawley, WA 6009, Australia. EThe Cascade of Tidal Energy from Low to High Modes on a Continental Slope SAMUEL M. KELLY

  18. Phase 1-supplemental development of a kinematic Stirling/Rankine commercial gas-fired heat-pump system. Final report, January 1989-June 1989

    SciTech Connect (OSTI)

    Monahan, R.

    1989-06-01T23:59:59.000Z

    The kinematic Stirling/Rankine gas heat pump concept is based on the application of a Stirling engine that has been under development for over a decade. The engine has been converted to natural gas and is characterized with many thousand hours of operating experience. The goal of the project is to develop a commercial size Stirling engine-driven gas heat pump with a cooling capacity of 10 tons, a COP (heating) of 1.8 and a COP (cooling) of 1.1. The project is a multi-phase development with commercialization planned for the mid-1990's. In previous phases, an HVAC-systems manufacturer (York International) had been working with SPS to develop a prototype gas-heat-pump system. To date, two generations of prototype GHP systems have been built and tested and have demonstrated significant operating cost savings over the conventional electric heat pump. Under the program, a number of design and manufacturing process changes were made to the engine to reduce costs and improve endurance and shaft efficiency and are described. The adaptation and operation of a computer optimization code was accomplished under the program and is reported herein.

  19. Conceptual study of the potential for automotive-derived and free-piston Stirling engines in 30- to 400-kilowatt stationary power applications. Final Report

    SciTech Connect (OSTI)

    Vatsky, A.; Chen, H.S.; Dineen, J.

    1982-05-01T23:59:59.000Z

    The technical feasibility of applying automotive-derived kinematic and free-piston Stirling engine concepts for stationary applications was explored. Automotive-derived engines offer cost advantages by providing a mature and developed engine technology base with downrating and parts commonality options for specific applications. Two engine sizes (30 and 400 kW), two Stirling engine configurations (kinematic and free-piston), and two output systems (crankshaft and hydraulic pump) were studied. The study includes the influences of using either hydrogen or helium as the working gas. The first kinematic configuration selects an existing Stirling engine design from an automotive application and adapts it to stationary requirements. A 50,000-hour life requirement was established by downrating the engine to 40 kW and reducing auxiliary loads. Efficiency improvements were gained by selective material and geometric variations and peak brake efficiency of 36.8 percent using helium gas was achieved. The second design was a four-cylinder, 400 kW engine, utilizing a new output drive system known as the z-crank, which provides lower friction losses and variable stroke power control. Three different material and working gas combinations were considered. Brake efficiency levels varied from 40.5 percent to 45.6 percent. A 37.5 kW single-cycle, free-piston hydraulic output design was generated by scaling one cylinder of the original automotive engine and mating it to a counterbalanced reciprocal hydraulic pump. Metallic diaphragms were utilized to transmit power.

  20. Two-dimensional model of the air flow and temperature distribution in a cavity-type heat receiver of a solar stirling engine

    SciTech Connect (OSTI)

    Makhkamov, K.K.; Ingham, D.B.

    1999-11-01T23:59:59.000Z

    A theoretical study on the air flow and temperature in the heat receiver, affected by free convection, of a Stirling Engine for a Dish/Stirling Engine Power System is presented. The standard {kappa}-{epsilon} turbulence model for the fluid flow has been used and the boundary conditions employed were obtained using a second level mathematical model of the Stirling Engine working cycle. Physical models for the distribution of the solar insolation from the Concentrator on the bottom and side walls of the cavity-type heat receiver have been taken into account. The numerical results show that most of the heat losses in the receiver are due to re-radiation from the cavity and conduction through the walls of the cavity. It is in the region of the boundary of the input window of the heat receiver where there is a sensible reduction in the temperature in the shell of the heat exchangers and this is due to the free convection of the air. Further, the numerical results show that convective heat losses increase with decreasing tilt angle.

  1. Project Profile: Maintenance-Free Stirling Engine for High-Performance Dish

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

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010 | DepartmentEnergyThermalDepartmentSunTroughCSP

  2. Stockholm Environment Institute (SEI) | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with formSoutheastern IL Elec Coop,Lanka-DLRStandardStaxeraEthanolStirling

  3. Gauss-Seed Nets of Sturm-Liouville Problems With Energy-Independent Characteristic Exponents and Related Sequences of Exceptional Orthogonal Polynomials I. Canonical Darboux Transformations Using AEH Functions

    E-Print Network [OSTI]

    Gregory Natanson

    2013-05-31T23:59:59.000Z

    The paper applies the so-called 'Canonical-Darboux-Transformation' (CDT) method to reproduce general expressions for rational potentials (RPs) quantized in terms of exceptional orthogonal polynomial systems (X-OPSs). The benchmark of the new method recently developed by the author for implicit potentials solvable via hypergeometric functions is that rationally-extended SUSY partners of the original potential are quantized in terms of sequences of the so-called 'Gauss-seed' (GS) Heine polynomials starting from a polynomial of non-zero order. The common mark of the Darboux-Poschl-Teller (DPT) potential and isotonic oscillator discussed in this paper is that the appropriate rational Sturm-Liouville (RSL) equations have energy-independent characteristic exponents at both singular end points and as a result the appropriate sequences of GS Heine polynomials turn into X-OPSs with infinitely many members.

  4. Design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range. Volume 1. Technical report

    SciTech Connect (OSTI)

    Not Available,

    1980-09-15T23:59:59.000Z

    This project was Phase I of a multiphased program for the design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range. Phase I comprised the conceptual design and associated cost estimates of a stationary Stirling engine capable of being fueled by a variety of heat sources, with emphasis on coal firing, followed by the preparation of a plan for implementing the design, fabrication and testing of a demonstration engine by 1985. The development and evaluation of conceptual designs have been separated into two broad categories: the A designs which represent the present state-of-the-art and which are demonstrable by 1985 with minimum technical risk; and the B designs which involve advanced technology and therefore would require significant research and development prior to demonstration and commercialization, but which may ultimately offer advantages in terms of lower cost, better performance, or higher reliability. The majority of the effort in Phase I was devoted to the A designs.

  5. Phases I-C, I-D and I-E development of Kinematic Stirling/Rankine commercial gas-fired heat pump system. Final report, January 1986-September 1988

    SciTech Connect (OSTI)

    Monahan, R.E.

    1988-10-01T23:59:59.000Z

    The Kinematic Stirling/Rankine gas-heat-pump concept is based on the application of a Stirling engine under development for over a decade. The engine was converted to natural gas and is characterized with many thousand hours of operating experience. The goal of the project is to develop a commercial-size Stirling engine-driven gas heat pump with a cooling capacity of 10-tons, a COP (heating) of 1.8 and a COP (cooling) of 1.1. The project is a multi-phase development with commercialization planned for 1990. In these phases, an HVAC systems manufacturer (York International) has been working with SPS to develop a prototype gas-heat-pump system. To date, two generations of prototype GHP systems have been built and tested and have demonstrated significant operating cost savings over the conventional electric heat pump. Data are presented for environmental laboratory testing of both prototype gas heat pumps as well as durability, reliability, performance, and emission testing of the V160 Stirling engine. A number of design and manufacturing process changes were made to the engine to reduce costs and improve endurance and shaft efficiency and are described.

  6. Free-piston Stirling engine diaphragm-coupled Heat-Actuated Heat Pump component technology program: Volume 1, Phase 2A and 2B final report: Technical discussion

    SciTech Connect (OSTI)

    Ackermann, R.A.

    1988-01-25T23:59:59.000Z

    This report presents the results of an effort to develop and demonstrate the technical feasibility of a residential size Stirling-engine-driven diaphragm-coupled compressor for a heat pump application. The heat pump module consists of a 3-kW free-piston Stirling engine (FPSE), an efficient hydraulic transmission, and a nominal 3-ton capacity refrigerant (R-22) reciprocating compressor. During earlier Phase 1 activity, the lower end (hydraulic transmission and compressor) was designed, fabricated, mated to an existing Mechanical Technology Incorporated (MTI) FPSE, and tested. After several years of development, this heat pump module achieved a capacity of 2.5 refrigeration tons at 95/degree/F ambient conditions. While this was below the module's rated 3.0-ton capacity, it demonstrated the potential of the FPSE heat pump (FPSE/HP) and identified a lack of engine power as the main reason for the low capacity. During a companion engine development program sponsored by the Gas Research Institute, the engine was improved by developing a new displacer drive that increased the FPSE's power capability. During Phase 2, the new engine, the Mark I, was mated to the lower end (transmission/compressor) and tested. The testing of the Mark I FPSE/HP module was very successful, with the system achieving its 3.0-ton capacity goal and all other proof-of-concepts targets. Included herein is a discussion of the Phase 2 activity, including the results of the Mark I FPSE/HP module testing, a component design effort of several key lower end components that was performed to optimize the design, and the Lennox evaluation. 91 figs., 36 tabs.

  7. Sandia National Laboratories: Renewable Energy

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

    and reliability. To date, research has been conducted both on externally heated Stirling, organic Rankine, and steam Rankine engines and on the ... Page 19 of 28...

  8. Sandia National Laboratories: Energy Security

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

    and reliability. To date, research has been conducted both on externally heated Stirling, organic Rankine, and steam Rankine engines and on the ... Page 9 of 12...

  9. Public Interest Energy Research (PIER) Program FINAL PROJECT REPORT

    E-Print Network [OSTI]

    VALIDATION OF A 25 KILOWATT DUAL SHELL STIRLING ENGINE APRIL 2009 CEC5002009061 Prepared for: California Transportation Proof of Concept and Test Validation of a 25 kW Dualshell Stirling Engine final report for the 25kW Dualshell Stirling Engine Project (Contract Number 50004017) conducted by ADI Thermal Power

  10. A multispectral scanner survey of the United States Department of Energy's Paducah Gaseous Diffusion Plant

    SciTech Connect (OSTI)

    Not Available

    1991-06-01T23:59:59.000Z

    Airborne multispectral scanner data of the Paducah Gaseous Diffusion Plant (PGDP) and surrounding area were acquired during late spring 1990. This survey was conducted by the Remote Sensing Laboratory (RSL) which is operated by EG G Energy Measurements (EG G/EM) for the US Department of Energy (DOE) Nevada Operations Office. It was requested by the US Department of Energy (DOE) Environmental Audit Team which was reviewing environmental conditions at the facility. The objectives of this survey were to: (1) Acquire 12-channel, multispectral scanner data of the PGDP from an altitude of 3000 feet above ground level (AGL); (2) Acquire predawn, digital thermal infrared (TIR) data of the site from the same altitude; (3) Collect color and color-infrared (CIR) aerial photographs over the facilities; and (4) Illustrate how the analyses of these data could benefit environmental monitoring at the PGDP. This report summarizes the two multispectral scanner and aerial photographic missions at the Paducah Gaseous Diffusion Plant. Selected examples of the multispectral data are presented to illustrate its potential for aiding environmental management at the site. 4 refs., 1 fig., 2 tabs.

  11. Assessment of methods for hydrogen production using concentrated solar energy

    SciTech Connect (OSTI)

    Glatzmaier, G. [Peak Design, Evergreen, CO (United States); Blake, D. [National Renewable Energy Lab., Golden, CO (United States); Showalter, S. [Sandia National Lab., Albuquerque, NM (United States)

    1998-01-01T23:59:59.000Z

    The purpose of this work was to assess methods for hydrogen production using concentrated solar energy. The results of this work can be used to guide future work in the application of concentrated solar energy to hydrogen production. Specifically, the objectives were to: (1) determine the cost of hydrogen produced from methods that use concentrated solar thermal energy, (2) compare these costs to those of hydrogen produced by electrolysis using photovoltaics and wind energy as the electricity source. This project had the following scope of work: (1) perform cost analysis on ambient temperature electrolysis using the 10 MWe dish-Stirling and 200 MWe power tower technologies; for each technology, sue two cases for projected costs, years 2010 and 2020 the dish-Stirling system, years 2010 and 2020 for the power tower, (2) perform cost analysis on high temperature electrolysis using the 200 MWe power tower technology and projected costs for the year 2020, and (3) identify and describe the key technical issues for high temperature thermal dissociation and the thermochemical cycles.

  12. Survey on System Behavior Specification for Extending ProjectIT-RSL

    E-Print Network [OSTI]

    da Silva, Alberto Rodrigues

    complex and larger software systems stresses the importance of having well- engineered requirements. Requirements Engineering (RE) can no longer be an isolated upfront phase: RE is critical to ensure the success for specifying system behavior. From this survey we synthesize a greatest common subset of constructs, which can

  13. Sandia National Laboratories: CSP Industry Links

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

    CleaNergy Schlaich Bergermann und Partner Infinia Corporation Brayton Energy Stirling Engines Kockums Stirling Biopower Sunpower Friatec-Rheinhuette Tagged with: CLFR *...

  14. Free-piston Stirling engine diaphragm-coupled heat-actuated heat pump component technology program. Phase I/IA. Final report

    SciTech Connect (OSTI)

    Not Available

    1985-06-01T23:59:59.000Z

    This report presents the results of an effort to develop and demonstrate the technical feasibility of a residential size Stirling engine driven, diaphragm coupled compressor for a heat pump application. The module was to consist of a free piston resonant engine capable of producing 3 kW of useable power, a low loss hydraulic transmission and a nominal 3 ton refrigerant-22 reciprocating compressor. Presented are details of analysis predicted performance goals, design, development of hardware, component testing, and engine/compressor breadboard testing. The test results demonstrated the mechanical feasibility and operational stability of the design concept. The assembly did not stroke out to achieve the full capacity levels predicted, however, and a follow on phase IA was initiated in which the reasons for the short fall will be determined. Details of phase IA are included in the appendix. In general, it was concluded that losses in the hydraulic transmission were excessive to the point where insufficient power was available to the compressor to satisfy its driving requirements at the design point conditions. Future work is recommended to reduce the transmission losses so that full capacity can be achieved. 69 figs., 47 tabs.

  15. U.S. Department of Energy Consequence Management Under the National Response Framework

    SciTech Connect (OSTI)

    Don Van Etten and Paul Guss

    2009-02-03T23:59:59.000Z

    Under the Nuclear/Radiological Incident Annex of the National Response Framework, the U.S. Department of Energy (DOE) has specific responsibilities as a coordinating agency and for leading interagency response elements in the Federal Radiological Monitoring and Assessment Center (FRMAC). Emergency response planning focuses on rapidly providing response elements in stages after being notified of a nuclear/radiological incident. The use of Home Teams during the field team deployment period and recent advances in collecting and transmitting data from the field directly to assessment assets has greatly improved incident assessment times for public protection decisions. The DOEs Remote Sensing Laboratory (RSL) based in Las Vegas, Nevada, has successfully deployed technical and logistical support for this mission at national exercises such as Top Officials Exercise IV (TOPOFF IV). In a unique response situation, DOE will provide advance contingency support to NASA during the scheduled launch in the fall of 2009 of the Mars Science Laboratory (MSL). The MSL rover will carry a radioisotope power system that generates electricity from the heat of plutoniums radioactive decay. DOE assets and contingency planning will provide a pre-incident response posture for rapid early plume phase assessment in the highly unlikely launch anomaly.

  16. Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisitingContractElectron-StateEnergy /newsroom/_assets/images/energy-icon.png Energy

  17. Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMFormsGasRelease Date:researchEmerging ThreatsEmployment Openings

  18. Energy

    Office of Legacy Management (LM)

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA group currentBradleyTableSelling CorpNew 1325.8.Enaineer;/:4,4 (; ...) "..

  19. Innovative Phase Change Thermal Energy Storage Solution for Baseload Power Phase 1 Final Report

    SciTech Connect (OSTI)

    Qiu, Songgang

    2013-05-15T23:59:59.000Z

    The primary purpose of this project is to develop and validate an innovative, scalable phase change salt thermal energy storage (TES) system that can interface with Infinias family of free-piston Stirling engines (FPSE). This TES technology is also appropriate for Rankine and Brayton power converters. Solar TES systems based on latent heat of fusion rather than molten salt temperature differences, have many advantages that include up to an order of magnitude higher energy storage density, much higher temperature operation, and elimination of pumped loops for most of Infinias design options. DOE has funded four different concepts for solar phase change TES, including one other Infinia awarded project using heat pipes to transfer heat to and from the salt. The unique innovation in this project is an integrated TES/pool boiler heat transfer system that is the simplest approach identified to date and arguably has the best potential for minimizing the levelized cost of energy (LCOE). The Phase 1 objectives are to design, build and test a 1-hour TES proof-of-concept lab demonstrator integrated with an Infinia 3 kW Stirling engine, and to conduct a preliminary design of a 12-hour TES on-sun prototype.

  20. 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 DataDepartment of Energy Your Density Isn't Your Destiny:RevisedAdvisory Board Contributions EMEM RecoveryManagement'sJuneAprilEMS U.S.

  1. Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville Power AdministrationField Campaign:INEAWater UseCElizabethTwoJaniceEnerG2Energetics of Hydrogen .M

  2. A novel thermally biased mechanical energy conversion cycle Ian M. McKinley, Sam Goljahi, Christopher S. Lynch, and Laurent Pilona)

    E-Print Network [OSTI]

    Pilon, Laurent

    in the form of low grade waste heat.1 Methods for harvesting low grade waste heat include Stirling engines,2

  3. Proceedings of 2009 NSF Engineering Research and Innovation Conference, Honolulu, Hawaii Grant #0838874 Dynamic Modeling of a Regenerator for the

    E-Print Network [OSTI]

    Barth, Eric J.

    therefore run on heat from any source such as geothermal, solar, biomass or nuclear energy. The Stirling #0838874 Dynamic Modeling of a Regenerator for the Control-Based Design of Free-Piston Stirling Engines-piston Stirling engines with the goal of building a working prototype. The Stirling cycle is recast as a dynamic

  4. Heater head for stirling engine

    DOE Patents [OSTI]

    Corey, John A. (R.D. #2, Box 101 E, North Troy, NY 12182)

    1985-07-09T23:59:59.000Z

    A monolithic heater head assembly which augments cast fins with ceramic inserts which narrow the flow of combustion gas and obtains high thermal effectiveness with the assembly including an improved flange design which gives greater durability and reduced conduction loss.

  5. RP-5 Renewable Energy Efficiency Project

    SciTech Connect (OSTI)

    Neil Clifton; Eliza Jane Whitman; Jamal A. Zughbi

    2004-01-29T23:59:59.000Z

    This is the sixth quarterly technical report for the RP-5 Renewable Energy Efficiency Project. The report summarizes the work progress, effort and activities that took place during the period from October 1, 2003 through December 31, 2003. The report has been prepared in accordance with the Department of Energy (DOE) Guidelines. In coordination with the DOE, IEUA has revised the original Cooperative Agreement to reflect the actual and current project scope of work. The original Agreement statement of work (SOW) included conceptual and preliminary equipment and systems, which were further evaluated for feasibility and suitability for the project. As a result, some of the equipment was taken out of the project scope. In response to questions from the DOE, IEUA has submitted a summary report on the Organic Rankine Cycle (ORC) secondary power generation units for availability and suitability for this project and associated safety concerns pointed out by the DOE. IEUA has awarded the consulting engineering contract to Parsons Water and Infrastructure, Inc. to provide the project's design and construction services. The project's pre-design kickoff meeting was held at IEUA's headquarters on December 11, 2003. IEUA has submitted a proposal for a grant offered by California Energy Commission (CEC) which if awarded to IEUA, will add value to this project. IEUA has finalized and signed the agreement with Stirling Energy Systems (SES) to host a 25 kW Stirling Engine at the RP-5 plant site for reliability and performance testing using digester and natural gas. As a result of further evaluation of the flexible microturbine system, IEUA has decided to take it out of the project's scope of work; however, it may be considered in future projects at other locations. IEUA has installed a 60 kW Photovoltaic (PV) power generation system on the roof of the new headquarters building. A matching funds update is also included in the Results and Discussion section. The update presents the work effort performed by CH2M Hill, the PIER Consultant, and the associated costs that serve as matching funds for the RP-5 Renewable Energy Efficiency Project during this report period.

  6. ZU064-05-FPR RSL-logicism-final 1 December 2013 21:42 The Review of Symbolic Logic

    E-Print Network [OSTI]

    Brody, James P.

    would also like to thank, for their invaluable comments, Andrew Arana, Sharon Berry, Sebastien Gandon

  7. California's Energy Future - The View to 2050

    E-Print Network [OSTI]

    2011-01-01T23:59:59.000Z

    High-efficiency coal gasification, high-efficiency InjectionJatropha, etc. ) Gasification of coal or biomass with CO 2Coal/biomass co-firing, direct fired biomass Dish Stirling Biomass gasification

  8. Combined Heat and Power for Saving Energy and Carbon in Residential Buildings

    E-Print Network [OSTI]

    2000-01-01T23:59:59.000Z

    Stirling engines can be operated on a wide variety of fuels, including all fossil fuels, For more details visit http://www.Senertec.de biomass,

  9. Microsoft PowerPoint - FLC_MidCon_0908_TCAnderson.ppt [Compatibility...

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

    seismic * fracture studies * geomechanics studies * petrographics * hydraulic pumps * Stirling generator * flow assurance * seismic curvature analysis - Renewable energy: *...

  10. RP-5 Renewable Energy Efficiency Project

    SciTech Connect (OSTI)

    Neil Clifton; Eliza Jane Whitman; Jamal A. Zughbi

    2003-07-28T23:59:59.000Z

    This is the fourth quarterly technical report for the RP-5 Renewable Energy Efficiency Project. The report summarizes the work progress, effort and activities that took place during the period of April 1, 2003 to June 30, 2003. However, IEUA is preparing a Supplemental report that will be mailed to the Department of Energy (DOE) by August 1, 2003, that provides additional information regarding IEUA's plan to expedite certain project activities. The report has been prepared in accordance with the Department of Energy (DOE) Guidelines. This technical report covers all meetings, discussions, and engineering and design activities that took place to finalize the project scope of work and complete the Request for Proposal (RFP) for the RP-5 Renewable Energy Efficiency Project. IEUA has decided to invite three more consulting engineering firms besides CH2M Hill, the Public Interest Energy Research (PIER) Consultant, to submit proposals for the design of the energy efficiency project. The proposals are currently in the evaluation phase and a decision is expected by the end of July. IEUA moved to its new headquarters building on June 13, 2003. The central plant is the system that supplies cooling and heating water to the headquarters building, and it primarily consists of equipment listed in the cooperative agreement under ''Chiller and Heater''. The central plant equipment was successfully installed and started. Other activities include gas analysis of three sources of low quality digester gas and foul air which could be used as fuel for an innovative flex microturbine. IEUA is also working with Stirling Energy Systems to determine if the Agency should be a host site for their equipment for testing the engine's operation on digester and natural gas. A matching funds update is also included in the Results and Discussion section, which presents the work effort performed by the PIER Consultant and the associated costs that serve as matching funds for the RP-5 Project during this report period.

  11. Cooling the dark energy camera instrument

    SciTech Connect (OSTI)

    Schmitt, R.L.; Cease, H.; /Fermilab; DePoy, D.; /Ohio State U.; Diehl, H.T.; Estrada, J.; Flaugher, B.; /Fermilab; Kuhlmann, S.; /Ohio State U.; Onal, Birce; Stefanik, A.; /Fermilab

    2008-06-01T23:59:59.000Z

    DECam, camera for the Dark Energy Survey (DES), is undergoing general design and component testing. For an overview see DePoy, et al in these proceedings. For a description of the imager, see Cease, et al in these proceedings. The CCD instrument will be mounted at the prime focus of the CTIO Blanco 4m telescope. The instrument temperature will be 173K with a heat load of 113W. In similar applications, cooling CCD instruments at the prime focus has been accomplished by three general methods. Liquid nitrogen reservoirs have been constructed to operate in any orientation, pulse tube cryocoolers have been used when tilt angles are limited and Joule-Thompson or Stirling cryocoolers have been used with smaller heat loads. Gifford-MacMahon cooling has been used at the Cassegrain but not at the prime focus. For DES, the combined requirements of high heat load, temperature stability, low vibration, operation in any orientation, liquid nitrogen cost and limited space available led to the design of a pumped, closed loop, circulating nitrogen system. At zenith the instrument will be twelve meters above the pump/cryocooler station. This cooling system expected to have a 10,000 hour maintenance interval. This paper will describe the engineering basis including the thermal model, unbalanced forces, cooldown time, the single and two-phase flow model.

  12. -okfl ^ ORNL/CON-172 Linear Harmonic Analysis of Free-

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    Stirling Engines N. C. J. Chen F. P. Griffin OPERATED BY MARTIN MARIETTA ENERGY SYSTEMS, INC. #12;ORNL/CON-172 Engineering Technology Division* LINEAR HARMONIC ANALYSIS OF FREE-PISTON STIRLING/dynamic problem that is associated with a free-piston Stirling engine (FPSE). The governing equations

  13. Stirling cycle engine and heat pump

    SciTech Connect (OSTI)

    Mitchell, M.P.

    1986-11-18T23:59:59.000Z

    A method is described of operating a hot gas engine comprising a cylinder having one end thereof connected to the other end thereof through at least two separate closed heat exchanger assemblies. Each comprises heated heat exchanger means and cooled heat exchanger means serially arranged, the hot end of each such closed heat exchanger assembly is attached to the same end of the cylinder. Each closed heat exchanger assembly is equipped with valve means at each end thereof, the cylinder accommodating a double-acting reciprocating piston means. The piston means cyclically displaces and is displaced by a volume of gas for each such closed heat exchanger assembly. The volumes of gas are alternately confined in and released from the closed heat exchanger assemblies by the valves.

  14. Linear harmonic analysis of Stirling engine thermodynamics

    SciTech Connect (OSTI)

    Chen, N.C.J.; Griffin, F.P.; West, C.D.

    1984-08-01T23:59:59.000Z

    The analysis involves linearization of the pressure waveform and represents each term in the conservation equations by a truncated Fourier series, including enthalpy flux discontinuity. Second-Law analysis is presented of four important loss mechanisms that result from adiabatic cylinders, transient heat transfer in semiadiabatic cylinders, pressure drop through the heat exchangers, and gas leakage from the compression space. The four loss mechanisms, all leading to efficiency reduction below the Carnot level, are characterized by irreversible thermodynamic processes that occur when heat is transferred across a finite temperature difference; when gases at two different temperatures are mixed; or when there is a mass flow through a pressure difference. The allocation of each individual loss mechanism is derived precisely in terms of entropy production but evaluated by use of pressure, temperature, and mass oscillations calculated from the linear harmonic approximation. When the theory is applied to an engine of Sunpower's RE-1000 dimensions, it reveals clearly that the adiabatic loss (due to temperature fluctuations in the cylinders) consists of two components: gas mixing and heat transfer across a temperature difference. The theory further shows that the adiabatic effect is more important than the transient heat transfer loss if the gas-to-cylinder heat transfer rate is small (i.e., nearly adiabatic conditions); the reverse is true for intermediate heat transfer rates; and both losses vanish at very high heat transfer rates. In addition, entropy analyses of pressure drop and mass leakage for isothermal cylinders shed some light on coupling between the different individual loss mechanisms.

  15. Modal and Temporal Logics Colin Stirling

    E-Print Network [OSTI]

    Stirling, Colin

    : S S f(S) f(S ) f is essentially modal (using - and [-]). cps wssa 03 today #12;3 Summary: Fixed points [-]A( U )) Syntactically: property X such that 1. X ( - X) 2. X ( - tt [-]X) cps wssa 03 today.r.t ) then f 1. has a least fixed point, {S : f(S) S} 2. has a greatest fixed point, {S : S f(S)} cps wssa 03

  16. Bisimulation, Model Checking and Other Colin Stirling

    E-Print Network [OSTI]

    Stirling, Colin

    University of Edinburgh Edinburgh EH9 3JZ, UK email: cps@dcs.ed.ac.uk Contents 1 Introduction 2 2 Process to Park and Milner is described. It is essentially game theoretic and so we build on this view. It can

  17. Dish Stirling High Performance Thermal Storage

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

    National Laboratories Amir Faghri, University of Connecticut Judith Gomez, NREL National Solar Thermal Test Facility: World Class Capabilities at Your Service Testing 5MW...

  18. Stirling's approximation for central polynomial coefficients

    E-Print Network [OSTI]

    Eger, Steffen

    2012-01-01T23:59:59.000Z

    We derive asymptotic formulae for central polynomial coefficients, a generalization of binomial coefficients, using the distribution of the sum of independent uniform random variables and the CLT.

  19. Dish Stirling High Performance Thermal Storage

    Broader source: Energy.gov [DOE]

    This presentation was delivered at the SunShot Concentrating Solar Power (CSP) Program Review 2013, held April 2325, 2013 near Phoenix, Arizona.

  20. array aperture probes: Topics by E-print Network

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

    Steam Energy Transport Network Jeff Cumpston1 Renewable Energy Websites Summary: -Stirling collectors for a range of ground-cover ratios in arrays arranged subject to a...

  1. all-european transport network: Topics by E-print Network

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

    Steam Energy Transport Network Jeff Cumpston1 Renewable Energy Websites Summary: -Stirling collectors for a range of ground-cover ratios in arrays arranged subject to a...

  2. Innovative Application of Maintenance-Free Phase-Change Thermal Energy Storage for Dish-Engine Solar Power Generation

    SciTech Connect (OSTI)

    Qui, Songgang [Temple University] [Temple University; Galbraith, Ross [Infinia] [Infinia

    2013-01-23T23:59:59.000Z

    This final report summarizes the final results of the Phase II Innovative Application of Maintenance-Free Phase-Change Thermal Energy Storage for Dish-Engine Solar Power Generation project being performed by Infinia Corporation for the U.S. Department of Energy under contract DE-FC36-08GO18157 during the project period of September 1, 2009 - August 30, 2012. The primary objective of this project is to demonstrate the practicality of integrating thermal energy storage (TES) modules, using a suitable thermal salt phase-change material (PCM) as its medium, with a dish/Stirling engine; enabling the system to operate during cloud transients and to provide dispatchable power for 4 to 6 hours after sunset. A laboratory prototype designed to provide 3 kW-h of net electrical output was constructed and tested at Infinia's Ogden Headquarters. In the course of the testing, it was determined that the system's heat pipe network - used to transfer incoming heat from the solar receiver to both the Stirling generator heater head and to the phase change salt - did not perform to expectations. The heat pipes had limited capacity to deliver sufficient heat energy to the generator and salt mass while in a charging mode, which was highly dependent on the orientation of the device (vertical versus horizontal). In addition, the TES system was only able to extract about 30 to 40% of the expected amount of energy from the phase change salt once it was fully molten. However, the use of heat pipes to transfer heat energy to and from a thermal energy storage medium is a key technical innovation, and the project team feels that the limitations of the current device could be greatly improved with further development. A detailed study of manufacturing costs using the prototype TES module as a basis indicates that meeting DOE LCOE goals with this hardware requires significant efforts. Improvement can be made by implementing aggressive cost-down initiatives in design and materials, improving system performance by boosting efficiencies, and by refining cost estimates with vendor quotes in lieu of mass-based approaches. Although the prototype did not fully demonstrate performance and realize projected cost targets, the project team believes that these challenges can be overcome. The test data showed that the performance can be significantly improved by refining the heat pipe designs. However, the project objective for phase 3 is to design and test on sun the field ready systems, the project team feels that is necessary to further refine the prototype heat pipe design in the current prototype TES system before move on to field test units, Phase 3 continuation will not be pursued.

  3. Californias Energy Future: The View to 2050 - Summary Report

    E-Print Network [OSTI]

    Yang, Christopher

    2011-01-01T23:59:59.000Z

    High-efficiency coal gasification, high-efficiency InjectionJatropha, etc. ) Gasification of coal or biomass with CO 2Coal/biomass co-firing, direct fired biomass Dish Stirling Biomass gasification

  4. Matter & Energy Solar Energy

    E-Print Network [OSTI]

    Rogers, John A.

    See Also: Matter & Energy Solar Energy· Electronics· Materials Science· Earth & Climate Energy at the University of Illinois, the future of solar energy just got brighter. Although silicon is the industry Electronics Over 1.2 Million Electronics Parts, Components and Equipment. www.AlliedElec.com solar energy

  5. Energy Efficiency & Renewable Energy

    E-Print Network [OSTI]

    Federal buildings which begin the planning process by 2020 to achieve zero-net energy by 2030 PotentialEnergy Efficiency & Renewable Energy Overview of Hydrogen and Fuel Cell Activities Dr. Sunita of Energy Military Energy and Alternative Fuels Conference March 17-18, 2010 San Diego, CA #12;2 1. Overview

  6. Energy Conservation Renewable Energy

    E-Print Network [OSTI]

    Delgado, Mauricio

    Energy Conservation Renewable Energy The Future at Rutgers University Facilities & Capital Planning Operations & Services Utilities Operations 6 Berrue Circle Piscataway, NJ 08854 #12;Energy Conservation Wh C ti ? R bl EWhy Conservation? Renewable Energy Climate control reduces green house gases Reduces

  7. IRM National Reference Series: Japan: An evaluation of government-sponsored energy conservation research and development

    SciTech Connect (OSTI)

    Howard, C.D.

    1987-07-01T23:59:59.000Z

    Despite the recent drop in world oil prices, the Japanese government is continuing to stress energy conservation, because Japan relies on imports for 85% of its total energy requirements and virtually 100% of its petroleum. Japan stresses long-term developments and sees conservation as an integral part of its 50- to 100-year transition from fossil fuels to nuclear and renewable sources of energy. The Japanese government is targeting new materials, biotechnology, and electronics technologies as the foundation of Japan's economy in the 21st century. Most government research programs in Japan are governed by aggressive timetables and fixed technical goals and are usually guaranteed funding over a 5- to 10-year period. Of the major energy conservation research programs, the best known is the Moonlight Project, administered by the Ministry of International Trade and Industry (MITI), and oriented towards end-use technologies such as Stirling engines and advanced heat pumps. Parts of MITI's Basic Technologies for Future Industries Program involve research in new materials and bioreactors. The Science and Technology Agency's Exploratory Research in Advanced Technologies (ERATO) Program is also investigating these technologies while emphasizing basic research. Other ministries supporting research related to energy conservation are the Ministry of Education, Science, and Culture and the Ministry of Construction. For 1985, government spending for energy conservation research was at least $50 million. Private sector funding of energy conservation research was $500 million in 1984. A brief outline of major programs and key participants is included for several of the most relevant technologies. An overview of Japan's experience in international scientific collaboration is also included.

  8. applications project attap: Topics by E-print Network

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

    Physics Websites Summary: Status of Application CDD Barstow CACA 47702 B212 Stirling Energy Systems, Inc. Solar Three 111506 5,994 MUC: Limited & Moderate MILITARY: RED 914...

  9. application project hohenfels: Topics by E-print Network

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

    Physics Websites Summary: Status of Application CDD Barstow CACA 47702 B212 Stirling Energy Systems, Inc. Solar Three 111506 5,994 MUC: Limited & Moderate MILITARY: RED 914...

  10. acoustical engineering: Topics by E-print Network

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

    electricity Thermoacoustic Energy Conversion Waste or prime heat soundThermoacoustic Stirling Engine -- An acoustic amplifier: ambient heat exchanger (water) stacked Lee, Dongwon...

  11. application project ddap: Topics by E-print Network

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

    Physics Websites Summary: Status of Application CDD Barstow CACA 47702 B212 Stirling Energy Systems, Inc. Solar Three 111506 5,994 MUC: Limited & Moderate MILITARY: RED 914...

  12. aspens: Topics by E-print Network

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

    Design of Linear Energy Storage, Conversion and Utilization Websites Summary: Stirling Engines Final Report E FILE COpy I DO NOT | REMOVE Report Prepared by ASPEN SYSTEMS,...

  13. aspen populus tremuloides: Topics by E-print Network

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

    Design of Linear Energy Storage, Conversion and Utilization Websites Summary: Stirling Engines Final Report E FILE COpy I DO NOT | REMOVE Report Prepared by ASPEN SYSTEMS,...

  14. aspen populus tremula: Topics by E-print Network

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

    Design of Linear Energy Storage, Conversion and Utilization Websites Summary: Stirling Engines Final Report E FILE COpy I DO NOT | REMOVE Report Prepared by ASPEN SYSTEMS,...

  15. active proton pump: Topics by E-print Network

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

    Pati, Swapan K. 2005-01-01 13 PERFORMANCE OF A STIRLING ENGINE POWERED HEAT ACTIVATED HEAT PUMP Energy Storage, Conversion and Utilization Websites Summary: General Electric...

  16. activation decay heat: Topics by E-print Network

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

    relations re Rumin, Michel 6 PERFORMANCE OF A STIRLING ENGINE POWERED HEAT ACTIVATED HEAT PUMP Energy Storage, Conversion and Utilization Websites Summary: General Electric...

  17. additional direct heat: Topics by E-print Network

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

    Suman Kumar Banik 2007-11-02 31 PERFORMANCE OF A STIRLING ENGINE POWERED HEAT ACTIVATED HEAT PUMP Energy Storage, Conversion and Utilization Websites Summary: General Electric...

  18. GTO2015DBm

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

    J. Trainor-Guitton, LLNL Low Temp: Co-Production Demonstration Low-Temperature Stirling Engine for Geothermal Electricity Generation Samuel Weaver, Cool Energy, Inc. SURGE:...

  19. DOE Funds 15 New Projects to Develop Solar Power Storage and...

    Office of Environmental Management (EM)

    the practicality of integrating a thermal energy storage module with a dish stirling engine, enabling the system to operate during cloud transients and to provide...

  20. Energy Efficiency & Renewable Energy

    E-Print Network [OSTI]

    new Federal buildings which begin the planning process by 2020 to achieve zero net energy by 2030zero-net

  1. Energy Efficiency & Renewable Energy

    E-Print Network [OSTI]

    National Harbor #12;U.S. Energy Consumption U.S. Primary Energy Consumption by Source and Sector 2 #12 · Efficiencies can be 60% (electrical) and 85% (with CHP) · > 90% reduction in criteria pollutants U.S. Department of Energy #12;7 Market Transformation Government acquisitions could significantly reduce the cost

  2. Sandia Energy - Installation Energy Security

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

    Installation Energy Security Home Stationary Power Grid Modernization Resilient Electric Infrastructures Military Installation Energy Security Installation Energy SecurityTara...

  3. Radiological Contingency Planning for the Mars Science Laboratory Launch

    SciTech Connect (OSTI)

    Paul Guss, Robert Augdahl, Bill Nickels, Cassandra Zellers

    2008-04-16T23:59:59.000Z

    This paper describes the contingency planning for the launch of the Mars Science Laboratory scheduled for the 21-day window beginning on September 15, 2009. National Security Technologies, LLC (NSTec), based in Las Vegas, Nevada, will support the U.S. Department of Energy (DOE) in its role for managing the overall radiological contingency planning support effort. This paper will focus on new technologies that NSTecs Remote Sensing Laboratory (RSL) is developing to enhance the overall response capability that would be required for a highly unlikely anomaly. This paper presents recent advances in collecting and collating data transmitted from deployed teams and sensors. RSL is responsible to prepare the contingency planning for a range of areas from monitoring and assessment, sample collection and control, contaminated material release criteria, data management, reporting, recording, and even communications. The tools RSL has available to support these efforts will be reported. The data platform RSL will provide shall also be compatible with integration of assets and field data acquired with other DOE, National Aeronautics and Space Administration, state, and local resources, personnel, and equipment. This paper also outlines the organizational structure for response elements in radiological contingency planning.

  4. Sandia Energy - Energy Surety

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementing Nonlinear757 (1)Tara46Energy Storage Systems Permalink

  5. Sandia Energy - Energy Research

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearch > TheNuclear Press ReleasesInApplied &ClimateContactEnergyEnergy

  6. Sandia Energy - Energy Surety

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementing Nonlinear757 (1)Tara46Energy Storage Systems PermalinkEnergy Storage

  7. Energy Efficiency & Renewable Energy

    E-Print Network [OSTI]

    In the United States: > 200 fuel cell vehicles > 20 fuel cell buses ~ 60 fueling stations Production & Delivery biomass & solar). Potential U.S. employment from fuel cell and hydrogen industries of up to 925,000 jobsEnergy Efficiency & Renewable Energy DOE Hydrogen & Fuel Cell Overview Dr. Sunita Satyapal Program

  8. Energy 101: Geothermal Energy

    SciTech Connect (OSTI)

    None

    2014-05-27T23:59:59.000Z

    See how we can generate clean, renewable energy from hot water sources deep beneath the Earth's surface. The video highlights the basic principles at work in geothermal energy production, and illustrates three different ways the Earth's heat can be converted into electricity.

  9. Energy 101: Geothermal Energy

    ScienceCinema (OSTI)

    None

    2014-06-23T23:59:59.000Z

    See how we can generate clean, renewable energy from hot water sources deep beneath the Earth's surface. The video highlights the basic principles at work in geothermal energy production, and illustrates three different ways the Earth's heat can be converted into electricity.

  10. Energy Policy

    Broader source: Energy.gov [DOE]

    The Energy Department is focusing on an all-of-the-above energy policy, investing in all sources of American energy.

  11. Sandia Energy - Renewable Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del Sol Home Distribution GridDocuments Home Stationary Power EnergyRenewable Energy

  12. Sandia Energy - Wind Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearch > TheNuclear PressLaboratorySoftware HometdheinrWater/Energy

  13. Sandia Energy - Energy Surety

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Scienceand RequirementsCoatingsUltra-High-Voltage SiliconEnergy CouncilEnergy Surety Home

  14. Sandia Energy - Wind Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementing Nonlinear757KelleyEffectsonSandia'sEventNotECWillie LukEnergy

  15. Sandia Energy - Renewable Energy Integration

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

    need to integrate renewable energy, improve energy efficiency, and allow consumers more control over their energy consumption. One of the challenges of renewable power generation...

  16. Department of Energy - Energy Sources

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

    295 en Using Passive Solar Design to Save Money and Energy http:energy.govenergysaverarticlesusing-passive-solar-design-save-money-and-energy

  17. Energy Sources | Department of Energy

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

    has launched the Energy Data Initiative (EDI). May 17, 2012 The Energy Department's digital team tested out Apps for Energy submissions in preparation for public voting. |...

  18. Energy Blog | Department of Energy

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

    to Mainstream: The Growth of the Global Clean Energy Marketplace Analyzing the past, present and future of the global clean energy marketplace. January 17, 2013 The Energy...

  19. Renewable Energy | Department of Energy

    Office of Environmental Management (EM)

    Science & Innovation Energy Sources Renewable Energy Renewable Energy Watch as these fourth grade students go from learning about electricity to making their own electricity...

  20. Energy Blog | Department of Energy

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

    Energy Future On Monday, the Energy Information Administration (EIA) issued the Annual Energy Outlook 2012 Early Release. This preview report provides updated projections for U.S....

  1. Energy Sources | Department of Energy

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

    September 13, 2013 Energy Analysis Energy analysis informs EERE decision-making by delivering analytical products in four main areas: Data Resources, Market Intelligence, Energy...

  2. Symmetry Energy

    E-Print Network [OSTI]

    P. Danielewicz

    2006-07-15T23:59:59.000Z

    Examination of symmetry energy is carried out on the basis of an elementary binding-energy formula. Constraints are obtained on the energy value at the normal nuclear density and on the density dependence of the energy at subnormal densities.

  3. Sandia Energy - Energy Assurance

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementing Nonlinear757 (1)Tara46 (1)Tara765o

  4. Sandia Energy - Nuclear Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementing Nonlinear757Kelley RuehlReport Posted North American

  5. Sandia Energy - Renewable Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementing Nonlinear757Kelley RuehlReportPeter H. KobosRandall

  6. Sandia Energy - Transportation Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementing Nonlinear757KelleyEffectsonSandia's Stan AtcittyRenewablesAnalysis

  7. Sandia Energy - Transportation Energy

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