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  • 1
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    Effect of rocket exhausts on infrared planet sensors. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Propellant rocket exhaust plume effect on error calculation for radiation balance IR tracker
    Keywords: SPACE VEHICLES
    Type: JOURNAL OF SPACECRAFT AND ROCKETS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Low concentration ratio solar array for low Earth orbit multi-100kW application. Volume 2: Drawings (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A preliminary design effort directed toward a low concentration ratio photovoltaic array system based on 1984 technology and capable of delivering multi-hundred kilowatts (300 kW to 100 kW range) in low Earth orbit. The array system consists of two or more array modules each capable of delivering between 113 kW to 175 kW using silicon solar cells or gallium arsenide solar cells, respectively. The array module deployed area is 1320 square meters and consists of 4356 pyramidal concentrator elements. The module, when stowed in the Space Shuttle's payload bay, has a stowage volume of a cube with 3.24 meters on a side. The concentrator elements are sized for a geometric concentration ratio (GCR) of six with an aperture area of 0.5 meters x 0.5 meters. Drawings for the preliminary design configuration and for the test hardware that was fabricated for design evaluation and test are provided.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-170870 , NAS 1.26:170870 , SSD-83-0075-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Estimating the Performance of a Concentrating Solar Array (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Comprehensive mathematical-analysis technique developed for array of solar-photovoltaic panels equipped with truncated-pyramid concentrators. Hollow pyramidal concentrator reflects Sunlight onto panel of photovoltaic cells. Comprehensive optical, thermal, and electrical analysis performed on array of units. Technique applicable, with modifications, to analysis and design of other multiple-cell reflecting photovoltaic systems.
    Keywords: PHYSICAL SCIENCES
    Type: MFS-28021 , NASA Tech Briefs (ISSN 0145-319X); 9; 2; P. 82
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Optical, thermal, and electrical performance of low-CR solar arrays (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper describes the analysis and testing of a photovoltaic low-CR concentrator shaped like a truncated pyramid with an aperture of 0.5 m on a side and a geometric concentration ratio of six. The truncated base plane is covered by either silicon (Si) or gallium arsenide (GaAs) solar cells. Ray-trace analysis of the concentrator predicts a peak optical efficiency of 0.77, which falls off only gradually with pointing error. A coupled thermal-electrical analysis of the system shows that the moderately nonuniform illumination produced by the concentrator does not result in significant mismatch losses, provided the solar cells are connected in parallel groups. The results of ground tests involving a full-scale prototype concentrator conform well with theoretical predictions.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Design of large, low-concentration-ratio solar arrays for low earth orbit applications (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''82; Seventeenth Intersociety Energy Conversion Engineering Conference; Aug 08, 1982 - Aug 12, 1982; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    S-2 stage 1/25 scale model base region thermal environment test. Volume 1: Test results, comparison with theory and flight data (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A 1/25 scale model S-2 stage base region thermal environment test is presented. Analytical results are included which reflect the effect of engine operating conditions, model scale, turbo-pump exhaust gas injection on base region thermal environment. Comparisons are made between full scale flight data, model test data, and analytical results. The report is prepared in two volumes. The description of analytical predictions and comparisons with flight data are presented. Tabulation of the test data is provided.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-129009 , SD73-SA-0061-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    S-2 stage 1/25 scale model base region thermal environment test. Volume 2: Test data tabulation, statistical analysis results, and heating rate contours (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For abstract see .
    Keywords: SPACE VEHICLES
    Type: NASA-CR-129010 , SD73-SA-0061-VOL-2
    Format: application/pdf
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  • 8
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    Heat-rejection design for large concentrating solar arrays (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper considers the effect of heat rejection devices (radiators) on the performance and cost of large concentrating solar arrays for space application. Overall array characteristics are derived from the weight, cost, and performance of four major components; namely primary structure, optics/secondary structure, radiator, and solar panel. An ideal concentrator analysis is used to establish general cost and performance trends independent of specific array design. Both passive and heat-pipe radiation are evaluated, with an incremental cost-of-power approach used in the evaluation. Passive radiators are found to be more cost effective with silicon than with gallium arsenide (GaAs) arrays. Representative concentrating arrays have been evaluated for both near-term and advanced solar cell technology. Minimum cost of power is achieved at geometric concentration ratios in the range 2 to 6.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Energy to the 21st century; Aug 18, 1980 - Aug 22, 1980; Seattle, WA
    Format: text
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