DTU Satellite Systems and Design Course Cubesat Thermal ... - CRN
DTU Satellite Systems and Design Course Cubesat Thermal ... - CRN
DTU Satellite Systems and Design Course Cubesat Thermal ... - CRN
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Danish Space Research Institute<br />
Danish Small <strong>Satellite</strong> Programme<br />
Radiation into Cold Space<br />
The infrared radiation in Watts into cold space from a surface (radiator) having the area A r , the<br />
absolute temperature T r <strong>and</strong> the emissivity ε is given by:<br />
Q e = ε⋅σ⋅A r ⋅(T r4 -T 04 )<br />
where σ = 5.6696⋅10 -8 W⋅m -2 ⋅K -4 is the Stephan-Boltzmann constant<br />
<strong>and</strong> T 0<br />
is the temperature of the cosmic background radiation, which closely matches the spectral<br />
properties of black-body radiation from a 2.7 K warm body. As the temperature is to the fourth<br />
power, a very good approximation is:<br />
Q e<br />
= ε⋅σ⋅A r<br />
⋅T<br />
4<br />
r<br />
FH 2001-08-29<br />
<strong>Cubesat</strong>_<strong>Thermal</strong>_<strong>Design</strong>.ppt<br />
Slide # 10
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