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  • 1
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    Update on the advanced Stirling conversion system project for 25 kW dish Stirling applications (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Technology development for Stirling convertors directed toward a dynamic power source for space applications is examined. The free-piston Stirling engine has the potential for both solar and nuclear space power applications. Two parallel design directions feature a solar receiver/liquid metal heat transport system, and a free-piston Stirling convertor which incorporates a linear alternator to directly provide the electrical output of about 25 kW to a utility grid. The Cummins Engine Company (CEC) free-piston Stirling convertor incorporates a linear alternator along with hydrodynamic gas bearings to provide noncontacting, wear-free support to the pistons. The Stirling Technology Company design incorporates linear alternator technology with flexures that provide noncontacting support while also supplying much of the spring stiffness needed to obtain proper resonance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 5 (A93-25851 09-44); p. 5.229-5.235.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Electric and hybrid electric vehicle study utilizing a time-stepping simulation (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The applicability of NASA's advanced power technologies to electric and hybrid vehicles was assessed using a time-stepping computer simulation to model electric and hybrid vehicles operating over the Federal Urban Driving Schedule (FUDS). Both the energy and power demands of the FUDS were taken into account and vehicle economy, range, and performance were addressed simultaneously. Results indicate that a hybrid electric vehicle (HEV) configured with a flywheel buffer energy storage device and a free-piston Stirling convertor fulfills the emissions, fuel economy, range, and performance requirements that would make it acceptable to the consumer. It is noted that an assessment to determine which of the candidate technologies are suited for the HEV application has yet to be made. A proper assessment should take into account the fuel economy and range, along with the driveability and total emissions produced.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 3 (A93-25851 09-44); p. 3.159-3.165.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Solar powered Stirling cycle electrical generator (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Under NASA's Civil Space Technology Initiative (CSTI), the NASA Lewis Research Center is developing the technology needed for free-piston Stirling engines as a candidate power source for space systems in the late 1990's and into the next century. Space power requirements include high efficiency, very long life, high reliability, and low vibration. Furthermore, system weight and operating temperature are important. The free-piston Stirling engine has the potential for a highly reliable engine with long life because it has only a few moving parts, non-contacting gas bearings, and can be hermetically sealed. These attributes of the free-piston Stirling engine also make it a viable candidate for terrestrial applications. In cooperation with the Department of Energy, system designs are currently being completed that feature the free-piston Stirling engine for terrestrial applications. Industry teams were assembled and are currently completing designs for two Advanced Stirling Conversion Systems utilizing technology being developed under the NASA CSTI Program. These systems, when coupled with a parabolic mirror to collect the solar energy, are capable of producing about 25 kW of electricity to a utility grid. Industry has identified a niche market for dish Stirling systems for worldwide remote power application. They believe that these niche markets may play a major role in the introduction of Stirling products into the commercial market.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: National Aeronautics and Space Administration, Technology 2000, Volume 1; p 269-278
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Early Results from Solar Dynamic Space Power System Testing (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A government/industry team designed, built and tested a 2-kWe solar dynamic space power system in a large thermal vacuum facility with a simulated Sun at the NASA Lewis Research Center. The Lewis facility provides an accurate simulation of temperatures, high vacuum and solar flux as encountered in low-Earth orbit. The solar dynamic system includes a Brayton power conversion unit integrated with a solar receiver which is designed to store energy for continuous power operation during the eclipse phase of the orbit. This paper reviews the goals and status of the Solar Dynamic Ground Test Demonstration project and describes the initial testing, including both operational and performance data. System testing to date has accumulated over 365 hours of power operation (ranging from 400 watts to 2.0-W(sub e)), including 187 simulated orbits, 16 ambient starts and 2 hot restarts. Data are shown for an orbital startup, transient and steady-state orbital operation and shutdown. System testing with varying insolation levels and operating speeds is discussed. The solar dynamic ground test demonstration is providing the experience and confidence toward a successful flight demonstration of the solar dynamic technologies on the Space Station Mir in 1997.
    Keywords: Spacecraft Propulsion and Power
    Type: NASA-TM-107252 , E-10176-1 , NAS 1.15:107252
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Automotive Stirling Engine Development Project (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development and verification of automotive Stirling engine (ASE) component and system technology is described as it evolved through two experimental engine designs: the Mod 1 and the Mod 2. Engine operation and performance and endurance test results for the Mod 1 are summarized. Mod 2 engine and component development progress is traced from the original design through hardware development, laboratory test, and vehicle installation. More than 21,000 hr of testing were accomplished, including 4800 hr with vehicles that were driven more dm 59,000 miles. Mod 2 engine dynamometer tests demonstrated that the engine system configuration had accomplished its performance goals for power (60 kW) and efficiency (38.5%) to within a few percent. Tests with the Mod 2 engine installed in a delivery van demonstrated combined metro-highway fuel economy improvements consistent with engine performance goals and the potential for low emission levels. A modified version of the Mod 2 has been identified as a manufacturable design for an ASE. As part of the ASE project, the Industry Test and Evaluation Program (ITEP), NASA Technology Utilization (TU) project, and the industry-funded Stirling Natural Gas Engine program were undertaken to transfer ASE technology to end users. The results of these technology transfer efforts are also summarized.
    Keywords: Urban Technology and Transportation
    Type: NASA-CR-190780 , NAS 1.26:190780 , MTI-91TR15 , E-10573 , DOE/NASA/0032-34
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Comparison of Stirling engines for use with a 25-kW disk-electric conversion system (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Heat engines were evaluated for terrestrial solar heat receivers. The Stirling Engine was identified as one of the most promising engines for terrestrial applications. The potential to meet the Department of Energy (DOE) goals for performance and cost can be met by the free-piston Stirling engine. NASA Lewis is providing technical management for an Advanced Stirling Conversion System (ASCS) through a cooperative interagency agreement with DOE. Parallel contracts were awarded for conceptual designs of an ASCS. Each design will feature a free-piston Stirling engine, a liquid-metal heat pipe receiver, and a means to provide about 25 kW of electric power to a utility grid while meeting long-term performance and goals. The Mechanical Technology, Ins. (MTI) design incorporates a linear alternator to directly convert the solar energy to electricity while the Stirling Technology Company (STC) generates electrical power indirectly by using a hydraulic output to a ground-bases hydraulic pump/motor coupled to a rotating alternator. Both designs use technology which can reasonably be expected to be available in the 1980's. The ASCS designs using a free-piston Stirling engine, a heat transport system, a receiver, and the methods of providing electricity to the utility grid will be discussed.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-TM-100111 , E-3655 , NAS 1.15:100111 , DOE/NASA-33408-2 , AIAA PAPER 87-9069
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Overview of the Solar Dynamic Ground Test Demonstration Program at the NASA Lewis Research Center (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Solar Dynamic (SD) Ground Test Demonstration (GTD) program demonstrates the availability of SD technologies in a simulated space environment at the NASA Lewis Research Center (LERC) vacuum facility. Data from the SD GTD program will be provided to the joint U.S. and Russian team which is currently designing a 2 kW SD flight demonstration power system. This SD technology has the potential as a future power source for the International Space Station. This paper reviews the goals and status of the SD GTD program. A description of the SD GTD system includes key design features of the system, subsystems and components.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-106876 , E-9501 , NAS 1.15:106876
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Phase 1 results from the Stirling-powered vehicle project (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The NASA Technology Utilization (TU) Office is sponsoring a multiyear, multiphase demonstration program to assess the technology developed under the DOE/NASA automotive Stirling engine (ASE) program with engines installed in various Air Force vehicles while being evaluated by independent third parties under realistic conditions. This paper reviews the operational history of Phase 1 with a Mod 1 Stirling engine installed in an Air Force multistop van in a variety of missions. Ten months of operation were with Air Force personnel at Langley Air Force Base, Virginia, where over 1100 hr and 4000 mi were logged on the Langley flight line. The Stirling-powered van operated on unleaded gasoline, JP-4 aircraft fuel, and diesel fuel at Langley Air Force Base. Two months of operation were completed with Deere and Company personnel in the Moline, Illinois area where over 175 hr and 2650 mi were logged on a Deere mail delivery route.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-TM-100978 , DOE/NASA/50112-76 , E-4270 , NAS 1.15:100978
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Experimental Data for Two Different Alternator Configurations in a Solar Brayton Power System (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A solar dynamic (SD) space power system has been under test at the NASA Lewis Research Center since 1994. The SD Ground Test Demonstration (GTD) system includes a solar concentrator, heat receiver with thermal energy storage, Brayton power conversion unit, and radiator installed in a thermal-vacuum chamber with a solar simulator. The Brayton unit has been operated with two different turboalternator compressor (TAC) assemblies, one which included a Rice Lundell alternator and another which incorporated a permanent magnet (PM) alternator. The Rice alternator was part of the mini-Brayton rotating unit, designed and built during the 1970's and refurbished for the GTD. The PM TAC was a development unit from the Joint US/Russian SD Flight Project. This paper highlights the operational differences (and similarities) between the Rice and PM TAC configurations including a comparative evaluation of startup characteristics and operating performance. The two alternator configurations were tested under similar thermal conditions, as an interchangeable component within the SD system. The electrical characteristics of the two units, however, dictated the use of significantly different power conditioning and control strategies. The electrical control architectures are described and compared. Test data are presented on TAC startup and system operating performance for both configurations.
    Keywords: Spacecraft Propulsion and Power
    Type: NASA-TM-107509 , NAS 1.15:107509 , E-10811 , IECEC-97481 , Intersociety Energy Conversion Engineering; Jul 27, 1997 - Aug 01, 1997; Honolulu, HI; United States
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    NASA TECHNICAL REPORTS
  • 10
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    Overview of the solar dynamic ground test demonstration program (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Solar Dynamic (SD) Ground Test Demonstration (GTD) program demonstrates the availability of SD technologies in a simulated space environment at the NASA Lewis Research Center (LeRC) vacuum facility. An aerospace industry/ government team is working together to design, fabricate, build, and test a complete SD system. This paper reviews the goals and status of the SD GTD program. A description of the SD system includes key design features of the system, subsystems, and components as reported at the Critical Design Review (CDR).
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-106296 , E-8034 , NAS 1.15:106296 , Intersociety Energy Conversion Engineering Conference; Aug 08, 1993 - Aug 13, 1993; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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