SIRTF thermal design modifications to increase lifetime

Stanley Walter Petrick

doi:10.1117/12.140890

21 January 1993 SIRTF thermal design modifications to increase lifetime

Stanley Walter Petrick

Proceedings Volume 1765, Cryogenic Optical Systems and Instruments V; (1993) https://doi.org/10.1117/12.140890
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

An effort was made to increase the predicted lifetime of the SIRTF dewar by lowering the exterior shell temperature, increasing the radiated energy from the vapor cooled shields and reconfiguring the vapor cooled shields. The lifetime increases can be used to increase the scientific return from the mission and as a trade-off against mass and cost. This paper describes the configurations studied, the steady state thermal model used, the analytical methods and the results of the analysis. Much of the heat input to the outside dewar shell is radiative heat transfer from the solar panel. To lower the shell temperature, radiative cooled shields were placed between the solar panel and the dewar shell and between the bus and the dewar shell. Analysis showed that placing a radiator on the outer vapor cooled shield had a significant effect on lifetime. Lengthening the distance between the outer shell and the point where the vapor cooled shields are attached to the support straps also improved lifetime.

Citation Download Citation

Stanley Walter Petrick "SIRTF thermal design modifications to increase lifetime", Proc. SPIE 1765, Cryogenic Optical Systems and Instruments V, (21 January 1993); https://doi.org/10.1117/12.140890

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