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Validation of Landsat-7 ETM+ MEM Thermal Improvement in Thermal Vacuum Tests and in Flight Due to Lower Louver Set Points
Technical Paper
1999-01-2629
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The Enhanced Thematic Mapper Plus (ETM+) Main Electronics Module (MEM) power supply heat sink temperature is critical to the Landsat-7 mission. It is strongly dependent on the thermal louver design. A lower power supply heat sink temperature increases the reliability of the MEM, and reduces the risk of over heating and thermal shutdown. After the power supply failures in ETM+ instrument thermal vacuum tests #1 and #2, the author performed detailed thermal analyses of the MEM, and proposed to reduce the louver set points by 7°C. At the 1998 Intersociety Energy Conversion Engineering Conference (IECEC), the author presented a paper that included results of thermal analysis of the MEM. It showed that a 7°C reduction of the louver set points could reduce the maximum power supply heat sink temperature in thermal vacuum test and in flight to below 20°C in the cooler outgas mode and in the nominal imaging mode, and has no significant impact on the standby heater duty cycle [1]. It also showed that the effect of Earth infrared and albedo on the power supply heat sink temperature is small. The louver set point reduction was implemented in June 1998, just prior to ETM+ thermal vacuum test #3. Results of the thermal vacuum tests, and temperature data in flight validate the MEM thermal performance improvement due to the 7°C reduction of the louver set points.
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Citation
Choi, M., "Validation of Landsat-7 ETM+ MEM Thermal Improvement in Thermal Vacuum Tests and in Flight Due to Lower Louver Set Points," SAE Technical Paper 1999-01-2629, 1999, https://doi.org/10.4271/1999-01-2629.Also In
References
- Choi, M. K. Landsat-7 ETM+ Thermal Design and Thermal Vacuum test: Impacts of Heritage design and lessons Learned, Paper presented at 34th IECEC, Paper No. IECEC-98-342 Colorado Springs, CO Aug. 2-6, 1998
- Landsat-7 ETM+ ICD, #23007902, 1995 Version Goddard Space Flight Center Greenbelt, MD 1995
- Landsat-7 ETM+ ICD, #23007902, 1997 Version Goddard Space Flight Center Greenbelt, MD 1997
- Diffoot, R. Band 7 CR6 Diode Test Data Received at Goddard Space Flight Center Landsat-7 Project on March 4 1998 Santa Barbara Remote Sensing Goleta, California 1998
- Diffoot, R. Pan Band Average Temperature Test Data of 6627 Diode Received at Goddard Space Flight Center Landsat-7 Project on March 9 1998 Santa Barbara Remote Sensing Goleta, California 1998
- Gregory, J. Memo to P. Mylod of Space Imaging EOSAT March 17 Earth Observing Satellite Co. Lanham, Maryland 1997
- Gregory, J. Electronic Mail to M. Choi of NASA Goddard Space Flight Center February 17 Earth Observing Satellite Co. Lanham, Maryland 1998
- ETM+ Thermal Design Documentation, PL2807ET02766- 1 June 1994 71 84 Santa Barbara Research Center Goleta, CA 1994
- Landsat Louver test Data Summary, DWG. No. 846-123-004 Orbital Sciences Corp. Germantown, MD June 3 1998
- Landsat-7 Flight Data Landsat-7 Mission Operations Center, NASA Goddard Space Flight Center Greenbelt, MD April 15 May 15 1999