Design of the Apache Point Observatory 3.5-m telescope: V. Telescope-enclosure thermal modeling

Walter A. Siegmund

doi:10.1117/12.19226

1 July 1990 Design of the Apache Point Observatory 3.5-m telescope: V. Telescope-enclosure thermal modeling

Walter A. Siegmund

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19226
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

A 3.5 m telescope is under construction at Apache Point near Alamogordo, New Mexico, at an elevation of 2800 m. A thermal model of a telescope enclosure is described. The model evaluates various strategies for minimizing local sources of image degradation (dome seeing). Direct and diffuse insolation, radiation to the sky, conduction, and the thermal inertia of the walls, interior air, roof, and structural steel are included. It is observed that highly reflective surface coatings reduce heat absorbed during the day, but are not very effective in reducing heat transfer in the telescope chamber at night, assuming that components with large heat capacities or thermal time constants are insulated.

Citation Download Citation

Walter A. Siegmund "Design of the Apache Point Observatory 3.5-m telescope: V. Telescope-enclosure thermal modeling", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19226

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