Consider the spherical satellite of 12.130. Instead of the
Chapter , Problem 12.137(choose chapter or problem)
Consider the spherical satellite of 12.130. Instead of the entire satellite being coated with a material that is spectrally selective, half of the satellite is covered with a diffuse gray coating characterized by 1 0.6. The other half of the satellite is coated with a diffuse gray material with 2 0.3. (a) Determine the steady-state satellite temperature when the satellite is on the bright side of the earth with the high-absorptivity coating facing the sun. Determine the steady-state satellite temperature when the low-absorptivity coating faces the sun. Hint: Assume one hemisphere of the satellite is irradiated by the sun and the opposite hemisphere is irradiated by the earth. (b) Determine the steady-state satellite temperature when the satellite is on the dark side of the earth with the high-absorptivity coating facing the earth. Determine the steady-state satellite temperature when the low-absorptivity coating faces the earth. (c) Identify a scheme to minimize the temperature variations of the satellite as it travels between the bright and dark sides of the earth.
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