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  • 1
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    High-Temperature Ceramic Heat Exchanger Element for a Solar Thermal Receiver (1982)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1982-11-01
    Description: A study has been completed on the development of a high-temperature ceramic heat exchanger element to be integrated into a solar receiver producing heated air. A number of conceptual designs were developed for heat exchanger elements of differing configuration. These were evaluated with respect to thermal performance, pressure drop, structural integrity, and fabricability. The final design selection identified a finned ceramic shell as the most favorable concept. The ceramic shell is surrounded by a larger metallic shell. The flanges of the two shells are sealed to provide a leak-tight pressure vessel. The ceramic shell is fabricated by an innovative combination of slip casting the receiver walls and precision casting the heat transfer finned plates. The fins are bonded to the shell during firing. Fabrication of a one-half scale demonstrator ceramic receiver has been completed.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
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    PAPER CURRENT
  • 2
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    Buffer Thermal Energy Storage for a Solar Brayton Engine (1983)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1983-05-01
    Description: A study has been completed on the application of latent-heat buffer thermal energy storage to a point-focusing solar receiver equipped with an air Brayton engine. To aid in the study, a computer program was written for complete transient/steady-state Brayton cycle performance. The results indicated that thermal storage can afford a significant decrease in the number of engine shutdowns as compared to operating without thermal storage. However, the number of shutdowns does not continuously decrease as the storage material weight increases. In fact, there appears to be an optimum weight for minimizing the number of shutdowns.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
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  • 3
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    Design Analysis and Containment Canister Life Prediction for a Brayton Engine Solar Receiver for Space Station (1994)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1994-08-01
    Description: A study has been conducted on the design and development of a solar receiver to be used for electrical power production for Space Station. The receiver incorporates integral thermal storage, using a eutectic mixture of LiF and CaF2 as a solid-to-liquid phase-change material (PCM). The design comprises a cylindrical receiver cavity. The walls of the cavity are lined with a series of working fluid tubes running the length of the cavity. The PCM is enclosed in individual, sealed metallic containment canisters which are stacked and brazed to the tubes. The compartmentalization of the PCM localizes void formation upon freezing. An additional attribute of compartmentalization is that a containment canister failure affects only that canister; the receiver continues to operate with only a minute loss of capacity. Nevertheless, a considerable effort has been expended to ensure that the containment canisters will survive a 30-year life. A detailed analytical procedure was developed to evaluate the canister creep strain accumulated in 30 years. This accumulated creep strain, which is in the range of 0.03 to 0.79 percent, compares favorably with the preliminary value of four percent for the canister material allowable 30-year creep rupture ductility.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
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  • 4
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    Thermal and Structural Analysis of the Heat Receiver for the Solar Dynamic Ground Test Demonstrator (1995)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1995-05-01
    Description: A solar dynamic ground test demonstrator space power system is being developed. The system comprises a complete Brayton engine—a heat receiver, concentrator, radiator, recuperator, heat rejection gas cooler, and turboalternator compressor. All of these components will be operated inside a vacuum tank. The engine is powered by simulated sunlight from an external bank of lights. Successful completion of the testing will indicate the readiness of solar dynamic power for space applications. This paper discusses the thermal and structural analysis of the heat receiver component. The analysis performed indicates that all components comfortably meet the life and cold start requirements, while maintaining the necessary overall performance.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
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  • 5
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    High-temperature ceramic heat exchanger element for a solar thermal receiver (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A study was performed by AiResearch Manufacturing Company, a division of The Garrett Corporation, on the development a high-temperature ceramic heat exchanger element to be integrated into a solar receiver producing heated air. A number of conceptual designs were developed for heat exchanger elements of differing configuration. These were evaluated with respect to thermal performance, pressure drop, structural integrity, and fabricability. The final design selection identified a finned ceramic shell as the most favorable concept. The shell is surrounded by a larger metallic shell. The flanges of the two shells are sealed to provide a leak-tight pressure vessel. The ceramic shell is to be fabricated by an innovative combination of slip casting the receiver walls and precision casting the heat transfer finned plates. The fins are bonded to the shell during firing. The unit is sized to produce 2150 F ar at 2.7 atm pressure, with a pressure drop of about 2 percent of the inlet pressure. This size is compatible with a solar collector providing a receiver input of 85 kw(th). Fabrication of a one-half scale demonstrator ceramic receiver has been completed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Parabolic Dish Solar Thermal Power Ann. Program Rev., Proc.; p 233-246
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Buffer thermal energy storage for an air Brayton solar engine (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The application of latent-heat buffer thermal energy storage to a point-focusing solar receiver equipped with an air Brayton engine was studied. To demonstrate the effect of buffer thermal energy storage on engine operation, a computer program was written which models the recuperator, receiver, and thermal storage device as finite-element thermal masses. Actual operating or predicted performance data are used for all components, including the rotating equipment. Based on insolation input and a specified control scheme, the program predicts the Brayton engine operation, including flows, temperatures, and pressures for the various components, along with the engine output power. An economic parametric study indicates that the economic viability of buffer thermal energy storage is largely a function of the achievable engine life.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-168657 , NAS 1.26:168657 , AIRESEARCH-81-18087
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    High-temperature ceramic heat exchanger element for a solar thermal receiver (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A study has been completed on the development of a high-temperature ceramic heat exchanger element to be integrated into a solar reciver producing heated air. A number of conceptual designs were developed for heat exchanger elements of differing configuration. These were evaluated with respect to thermal performance, pressure drop, structural integrity, and fabricability. The final design selection identified a finned ceramic shell as the most favorable concept. The ceramic shell is surrounded by a larger metallic shell. The flanges of the two shells are sealed to provide a leak-tight pressure vessel. The ceramic shell is fabricated by an innovative combination of slip casting the receiver walls and precision casting the heat transfer finned plates. The fins are bonded to the shell during firing. Fabrication of a one-half scale demonstrator ceramic receiver has been completed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A high temperature ceramic heat exchanger element for a solar thermal receiver (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development of a high-temperature ceramic heat exchanger element to be integrated into a solar receiver producing heated air was studied. A number of conceptual designs were developed for heat exchanger elements of differing configuration. These were evaluated with respect to thermal performance, pressure drop, structural integrity, and fabricability. The final design selection identified a finned ceramic shell as the most favorable concept. The shell is surrounded by a larger metallic shell. The flanges of the two shells are sealed to provide a leak-tight pressure vessel. The ceramic shell is to be fabricated by a innovative combination of slip casting the receiver walls and precision casting the heat transfer finned plates. The fins are bonded to the shell during firing. The unit is sized to produce 2150 F air at 2.7 atm pressure, with a pressure drop of about 2 percent of the inlet pressure. This size is compatible with a solar collector providing a receiver input of 85 kw(th). Fabrication of a one-half scale demonstrator ceramic receiver was completed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-169625 , NAS 1.26:169625 , REPT-81-18452
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Buffer thermal energy storage for a solar Brayton engine (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study has been completed on the application of latent-heat buffer thermal energy storage to a point-focusing solar receiver equipped with an air Brayton engine. To aid in the study, a computer program was written for complete transient/stead-state Brayton cycle performance. The results indicated that thermal storage can afford a significant decrease in the number of engine shutdowns as compared to operating without thermal storage. However, the number of shutdowns does not continuously decrease as the storage material weight increases. In fact, there appears to be an optimum weight for minimizing the number of shutdowns.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: AIAA PAPER 81-2531 , American Institute of Aeronautics and Astronautics, Terrestrial Energy Systems Conference; Dec 01, 1981 - Dec 03, 1981; Colorado Springs, CO
    Format: text
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  • 10
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    Advanced solar receivers for space power (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study has been conducted to generate and evaluate advanced solar heat receiver concepts suitable for orbital application with Brayton and Stirling engine cycles in the 7-kW size range. The generated receiver designs have thermal storage capability and, when implemented, will be lighter, smaller, and/or more efficient than baseline systems such as the configuration used for the Brayton solar receiver under development by Garrett AiResearch for the NASA Space Station. In addition to the baseline designs, four other receiver concepts were designed and evaluated with respect to Brayton and Stirling engines. These concepts include a higher temperature version of the baseline receiver, a packed bed receiver, a plate-fin receiver, and a heat pipe receiver. The thermal storage for all designs is provided by the melting and freezing of a salt.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Annual ASME Solar Energy Conference; Apr 10, 1988 - Apr 14, 1988; Denver, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
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