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  • ENERGY PRODUCTION AND CONVERSION  (5)
  • 1
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    Parabolic Dish Concentrator (PDC-1) (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The design, construction, and installation of the Parabolic Dish Concentrator, Type 1 (PDC-1) has been one of the most significant JPL concentrator projects because of the knowledge gained about this type of concentrator and the development of design, testing, and analysis procedures which are applicable to all solar concentrator projects. The need for these procedures was more clearly understood during the testing period which started with the prototype panel evaluation and ended with the performance characterization of the completed concentrator. For each phase of the test program, practical test procedures were required and these procedures defined the mathematical analysis which was essential for successful concentrator development. The concentrator performance appears to be limited only by the distortions resulting from thermal gradients through the reflecting panels. Simple optical testing can be extremely effective, but comprehensive mechanical and optical analysis is essential for cost effective solar concentrator development.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 5th Parabolic Dish Solar Thermal Power Program; p 15
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    JPL tests of a LaJet concentrator facet (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A LaJet Energy Company (LEC) concentrator facet, 60 in. in diameter, was tested for imaging quality. The following two methods were used: (1) autofocus tests with a point source of light at the facet's radius of curvature; and (2) tests with the Sun close to the horizon as a distant source. The tests of the LaJet facet indicate that all of the solar image reflected by an LEC 460 solar concentrator made of like facets should fall within a 9-in. aperture if the outer facets are carefully adjusted. Such a concentrator would have acceptable performance, but complete evaluation must be made with an assembled concentrator.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-173470 , JPL-PUB-83-92 , JPL-5105-125 , DOE/JPL-1060-64 , NAS 1.26:173470
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Concentrator optical characterization using computer mathematical modelling and point source testing (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The optical characteristics of a paraboloidal solar concentrator are analyzed using the intercept factor curve (a format for image data) to describe the results of a mathematical model and to represent reduced data from experimental testing. This procedure makes it possible not only to test an assembled concentrator, but also to evaluate single optical panels or to conduct non-solar tests of an assembled concentrator. The use of three-dimensional ray tracing computer programs to calculate the mathematical model is described. These ray tracing programs can include any type of optical configuration from simple paraboloids to array of spherical facets and can be adapted to microcomputers or larger computers, which can graphically display real-time comparison of calculated and measured data.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-174109 , DOE/JPL-1060-77 , JPL-PUB-84-75 , JPL-5105-140 , NAS 1.26:174109
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development and testing of Parabolic Dish Concentrator No. 1 (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Parabolic Dish Concentrator No. 1 (PDC-1) is a 12-m-diameter prototype concentrator with low life-cycle costs for use with thermal-to-electric energy conversion devices. The concentrator assembly features panels made of a resin transfer molded balsa core/fiberglass sandwich with plastic reflective film as the reflective surface and a ribbed framework to hold the panels in place. The concentrator assembly tracks in azimuth and elevation on a base frame riding on a circular track. It is shown that the panels do not exhibit the proper parabolic contour. However, thermal gradients were discovered in the panels with daily temperature changes. The PDC-1 has sufficient optical quality to operate satisfactorily in a dish-electric system. The PDC-1 development provides the impetus for creating innovative optical testing methods and valuable information for use in designing and fabricating concentrators of future dish-electric systems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-175651 , JPL-PUB-85-4 , DE-AM04-80AL-13137 , NAS 1.26:175651
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Solar concentrator panel and gore testing in the JPL 25-foot space simulator (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The optical imaging characteristics of parabolic solar concentrator panels (or gores) have been measured using the optical beam of the JPL 25-foot space simulator. The simulator optical beam has been characterized, and the virtual source position and size have been determined. These data were used to define the optical test geometry. The point source image size and focal length have been determined for several panels. A flux distribution of a typical solar concentrator has been estimated from these data. Aperture photographs of the panels were used to determine the magnitude and characteristics of the reflecting surface errors. This measurement technique has proven to be highly successful at determining the optical characteristics of solar concentrator panels.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: AIAA PAPER 81-2534 , 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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    NASA TECHNICAL REPORTS
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