A quick look at the expected thermal environment extremes for SBR LEO concepts

Details A quick look at the expected thermal environment extremes for SBR LEO concepts A quick look at the expected thermal environment extremes for SBR LEO concepts

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..458..753j&link_type=abstract

Space technology and applications international forum -1999. AIP Conference Proceedings, Volume 458, pp. 753-760 (1999).

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Spaceborne And Space Research Instruments, Apparatus, And Components

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The management and distribution of thermal energy is a critical aspect of any satellite design. Incorporation of thermal management concepts early in the system concept development is necessary in order to avoid costly redesigns as the system matures. This paper looks at the expected thermal extremes (full sun and eclipse) for a typical SBR LEO concept with a large planar phased array antenna in order to bound and begin definition of applicable thermal management concepts for these designs. The approach involves application of the energy equation (radiation only) using typical ranges of absorptivity and emissivity for spacecraft materials in order to determine the resulting antenna temperatures (steady state). Radiated power (RF) and power conversion efficiencies (input to RF) were also varied. The results show that the antennas are good thermal radiators as expected, and that the issue with thermal management on the antenna will not necessarily be cooling the antenna electronics but keeping them warm enough to operate, especially in power off conditions. Recommended approaches for addressing these issues are presented in order to initiate inclusion of these preliminary concepts in the design and research process as SBR and related antenna concepts mature.

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