Computer Science
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.571e..30s&link_type=abstract
Proceedings of The 4S Symposium: Small Satellites, Systems and Services (ESA SP-571). 20 - 24 September 2004, La Rochelle, Franc
Computer Science
Scientific paper
The purpose of satellite Thermal Control is to keep all the elements in their allowable temperature range. Orbit altitude is one of the most effective parameters on the amount of orbital heating rates received by the external surfaces of satellites. Also the altitude of satellite orbit has on effect on determining the orbit period (the time spent for one revolution of the satellite around the earth). By increasing the orbit altitude, satellite period increases too. For a specific beta angle, the time of satellite remaining in eclipse depends on the orbit altitude and will be decreased as the altitude increases. In this paper transient heat transfer and temperature distributions calculations for a small satellite model in four different orbits in LEO (low earth orbits) with altitudes of 700, 900, 1000, 1500 kilometers will be presented. The effects of orbit altitude variations on absorbed orbital heating rates (earth infrared radiation, albedo, solar radiation) by external surfaces of satellite are calculated. The temperature distribution of elements and surfaces are calculated. The model includes a small communication satellite with fast spine around the earth. According to the results obtained, increasing the satellite altitude decreases the absorbed orbital heating rates by its bottom plate so the temperature of this plate decreases. There aren't any considerable changes in absorbed orbital heating rates for satellite top plate and as a result temperature will not change with increasing the altitude. Satellite lateral plates experience different temperature conditions through increasing the altitude depending on beta angle. The temperature of all internal components depend on these variations changes too.
Khoddan S.
Khoshnam Foad
Shahryari Mohammad
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