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An experimental technique to resolve the Landsat-7 spacecraft heater debond issue

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1 Author(s)
Choi, M.K. ; NASA Goddard Space Flight Center, Greenbelt, MD, USA

Results of thermal vacuum testing of simulated 100% debonded equipment panel heaters revealed that with the primary heater on all the time and an 80°C heat sink, the worst case maximum heater temperature is 166°C for a 448 W/cm2 heater power density, and 223°C for a 0.673 W/cm2 heater power density. All the heaters on the equipment panels of the Landsat-7 spacecraft have a maximum heater power density of 0.460 W/cm2 or less, with only either the primary or redundant heater turned on. The equipment panel heaters have a 200°C maximum allowable temperature in the manufacturer's specifications. The maximum heater temperature for a 100% debonded heater in the worst case is 170°C, which has a 30°C margin. In order to exceed the 200°C maximum allowable temperature, the maximum heater power density needs to be higher than 0.589 W/cm2. Data from the tests to induce heater failure showed that the heater failed after it had reached 250°C to 253°C for 25 minutes. In order to exceed 250°C, the maximum heater power density needs to be higher than 0.9 W/cm2. For these reasons, there was no need to replace the equipment panel heaters which were suspected to have debonded

Published in:

Energy Conversion Engineering Conference, 1997. IECEC-97., Proceedings of the 32nd Intersociety

Date of Conference:

27 Jul-1 Aug 1997