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Homework Help: Satelite and heat from sun and earth.

  1. Sep 25, 2012 #1
    1. The problem statement, all variables and given/known data
    Assume that a satellite can be modeled as a thermally leading sphere with radius 0.5m and its energy consumption is 200W, and its surface can be described with α=0.3 and ε=0.9.
    Determine the equilibrium temperature of satellite in these cases:
    a) Satellite is between earth and sun;
    b) Earth is between satellite and sun;
    c) Satellite is far away from stars or planets.
    Assume that Suns radiation is 1367 Watt/m^2, from earth reflected 410 Watt/m^2 and that earths thermal radiation can be modeled as black body radiation with temperature T=255 K

    2. Relevant equations

    3. The attempt at a solution
    I know this law R_T=δ*b(T^4-T_∞^4) and the equilibrium state is when radiation=R_T,but thats only the case when one side of the body is isolated. But here i have radiation coming from 2 directions. So can someone please help me, with some ideas ?
  2. jcsd
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