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  • 1
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    Space Infrared Telescope Facility cryogenic and optical technology (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: SIRTF will require new liquid helium cryogenics and optical technology at liquid helium temperatures to meet the scientific requirements. In particular, it will require a helium cryogenic system operating at 1.25 K with a lifetime of five years. The optical system will require a 1-m mirror operating at 2 K, which is diffraction limited at 3 microns. This paper describes the advances which will be needed and the approaches to be taken.
    Keywords: ASTRONOMY
    Type: In: Infrared technology XVII; Proceedings of the Meeting, San Diego, CA, July 22-26, 1991 (A93-38376 15-35); p. 88-96.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Recent tests on the Carter small reciprocating steam engines (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The Jay Carter Enterprises (JCE) Paratransit Vehicle steam engine was tested over a range of conditions which might be experienced by the power converter subsystem of the Small Community Solar Thermal Power Experiment. Some difficulties were encountered getting the engine ready for testing. These difficulties were related to the five year dormancy of the entire system and to incomplete development work that had been going on at the time of cessation of steam engine work at JCE. Other difficulties were related to the fact that the particular expander being tested never ran before and possessed some manufacturing defects. Nevertheless, the engine was operated successfully and results of testing do verify results of computer simulations of the engine in regard to the effect of temperature and power level variations. Engine efficiency was good but generally lower than expected and performance dropped as testing continued. The effect of change in expansion ratio was not demonstrated because of deterioration in engine performance. Post-test inspection revealed numerous correctable defects.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Parabolic Dish Solar Thermal Power Ann. Program Rev., Proc.; p 123-145
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The small community solar thermal power experiment (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: the objectives and current status of the Small Community Solar Thermal Power Experiment are discussed. The adjustments in programs goals made in response to the changing emphasis in the area of solar energy in national policy are addressed. Planned fabrication and testing activities for the test bed concentrator, power conversion assembly, and control system are outlined.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Parabolic Dish Solar Thermal Power Ann. Program Rev., Proc.; p 49-52
    Format: text
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  • 4
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    The small community solar thermal power experiment (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Contractors were asked to develop a preferred system concept, to perform sensitivity analyses, and to outline recommended approaches for the follow-on design program of a one-megawatt solar thermal demonstration plant. The systems recommended by the contractors in each of the categories were: (1) McDonnell-Douglas Astronautics Company: Central tower with field of south-facing heliostats; (2) General Electric Company: Field of parabolic dishes with steam piped to a central turbine-generator unit; and (3) Ford Aerospace and Communications Corporation: Field of parabolic dishes with a Stirling cycle engine/generator unit at the focus of each dish. A description of each of the proposed experimental plants is given.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Parabolic Dish Solar Thermal Power Ann. Program Rev. Proc.; p 187-189
    Format: application/pdf
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  • 5
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    Support System for Solar Receivers (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Hinged split-ring mounts insure safe support of heavy receivers. In addition to safer operation and damage-free mounting system provides more accurate focusing, and small incremental adjustments of ring more easily made.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-15749 , NASA Tech Briefs (ISSN 0145-319X); 8; P. 349
    Format: text
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  • 6
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    Development of an Organic Rankine-Cycle power module for a small community solar thermal power experiment (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An organic Rankine-cycle (ORC) power module was developed for use in a multimodule solar power plant to be built and operated in a small community. Many successful components and subsystems, including the reciever, power conversion subsystem, energy transport subsystem, and control subsystem, were tested. Tests were performed on a complete power module using a test bed concentrator in place of the proposed concentrator. All major single-module program functional objectives were met and the multimodule operation presented no apparent problems. The hermetically sealed, self-contained, ORC power conversion unit subsequently successfully completed a 300-hour endurance run with no evidence of wear or operating problems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-175650 , JPL-PUB-85-3 , DE-AM04-80AL-13137 , NAS 1.26:175650
    Format: application/pdf
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  • 7
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    Precision Segmented Reflector figure control system architecture (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A control system architecture for an actively controlled segmented reflector is described along with a design realization for achieving precision alignment of reflector panels. Performance requirements are derived in part from the Large Deployable Reflector, which is a representative mission, and error allocations are made which consider mirror panel surface errors, position measurement and figure estimation, and position control of both quasi-static and dynamic disturbances. The design uses multiple wavelength interferometric edge sensors and voice coil actuators in conjunction with a hybrid control strategy to correct panel position errors. A unit cell shown to be central to the concept is analyzed. The cell integrates the sensing, actuation, and mechanical functions of a control module together with a reflector panel to form a unitized assembly.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Active Telescope Systems; Mar 28, 1989 - Mar 31, 1989; Orlando, FL; United States
    Format: text
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