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  • 1
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    Predicting the performance of solar illuminated thermal louvers for the GOES I, J, K instruments (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The new series of Geostationary Operational Environmental Satellites (GOES I,J,K,L/M) will have two earth viewing optical instruments which use passive, bi-metallic actuated, blade-type louvers for their thermal control. GOES is a three-axis stabilized spacecraft in geostationary orbit, which means that sun can enter the instrument apertures for several hours before and after local midnight. The solar heat absorbed in the instruments causes the louvers to open thus allowing the radiators to reject the heat. These louvered radiators are located on the north face of the instruments. To perform thermal analyses of the instruments, a modeling method was needed for predicting the thermal characteristics of the louvers. This task was complicated by the fact that sun shines on the louvers during the summer season. A Monte Carlo analytical technique was used to develop absorbed power and effective emissivity tables for the louvers. These tables could be used with the instrument math models to predict the thermal behavior of the instruments. Data from the Monte Carlo analysis showed that solar entrapment could have a significant effect on the heat rejection capability of the louvered radiators.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: AIAA PAPER 87-1568
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The Submillimeter-Wave Astronomy Satellite: On-Orbit Thermal Performance and Design Retrospective (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A large telescope aperture, stringent thermal stability and temperature range requirements, and a passively-cooled 1500K module presented major challenges in thermal design and hardware fabrication of this Small Explorer satellite. This paper reviews briefly the thermal design of the SWAS science instrument, and examines the first three months of on-orbit thermal history. Measured temperatures for both the science payload and the spacecraft module and solar arrays are compared with those predicted by the correlated analytical model. Similarities and differences are interpreted in terms of the major uncertainties remaining after thermal-balance testing, especially those of MLI performance and telescope aperture properties. Review of the thermal model adequacy and thermal design verification are included to suggest improvements in the thermal design process for future missions.
    Keywords: Spacecraft Design, Testing and Performance
    Type: Environmental Systems; Jul 12, 1999 - Jul 15, 1999; Denver, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Spectral radiation analyses of the GOES solar illuminated hexagonal cell scan mirror back (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A ray tracing analytical tool has been developed for the simulation of spectral radiation exchange in complex systems. Algorithms are used to account for heat source spectral energy, surface directional radiation properties, and surface spectral absorptivity properties. This tool has been used to calculate the effective solar absorptivity of the geostationary operational environmental satellites (GOES) scan mirror in the calibration position. The development and design of Sounder and Imager instruments on board GOES is reviewed and the problem of calculating the effective solar absorptivity associated with the GOES hexagonal cell configuration is presented. The analytical methodology based on the Monte Carlo ray tracing technique is described and results are presented and verified by experimental measurements for selected solar incidence angles.
    Keywords: OPTICS
    Type: AIAA PAPER 93-0589 , AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States|; 10 p.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Analytical Methodology Used To Assess/Refine Observatory Thermal Vacuum Test Conditions For the Landsat 8 Data Continuity Mission (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Thermal and Fluids Analysis Workshop Silver Spring, MD NCTS 21070-15 The Landsat 8 Data Continuity Mission, which is part of the United States Geologic Survey (USGS), launched February 11, 2013. A Landsat environmental test requirement mandated that test conditions bound worst-case flight thermal environments. This paper describes a rigorous analytical methodology applied to assess refine proposed thermal vacuum test conditions and the issues encountered attempting to satisfy this requirement.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: GSFC-E-DAA-TN24536 , Thermal and Fluids Analysis Workshop (TFAWS); Aug 03, 2015 - Aug 07, 2015; Silver Spring, MD; United States
    Format: application/pdf
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  • 5
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    The Submillimeter-Wave Astronomy Satellite: On-Orbit Thermal Performance and Design Retrospective (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A large telescope aperture, stringent thermal stability and temperature range requirements, and a passively-cooled 150 K module presented major challenges in thermal design and hardware fabrication of this Small Explorer satellite. This paper reviews briefly the thermal design of the SWAS science instrument, and examines the first three months of on-orbit thermal history. Measured temperatures for both the science payload and the spacecraft module and solar arrays are compared with those predicted by the correlated analytical model. Similarities and differences are interpreted in terms of the major uncertainties remaining after thermal-balance testing, especially those of MLI performance and telescope aperture properties. Review of the thermal model adequacy and thermal design verification are included to suggest improvements in the thermal design process for future missions.
    Keywords: Spacecraft Design, Testing and Performance
    Type: Rept-1999-01-1940
    Format: application/pdf
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