I ran across an equation that describes how much waste heat a radiator can drain away from a station or spacecraft.
∂Q/∂t = Re * (5.67x10e-8) * Ra * Rt^4
∂Q/∂t = amount of waste heat to get rid of (watts)
5.67x10e-8 = Stefan's Constant
Re = emissivity of radiator (theoretical maximum is 1.0)
Ra = area of radiator (m2)
Rt = temperature of radiator (degrees K)
My question primarily has to do with the third value there, "emissivity". I only found one existing HRS, the ones used on the ISS (http://www.lockheedmartin.com/produc...ors/index.html), but they didn't give any such value.
What is a typical emissivity rating for radiators? And is it measured using something called black bodies?
I found a wiki article that explains the Stefan Constant (or... tries to explain it anyway), but the math is beyond me. http://en.wikipedia.org/wiki/Stefan%...zmann_constant