Thermal Radiation Energy transfer

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I have a general question regarding Radiation. If the net Thermal Radiation is understood to be :

Pnet = Pabs - Prad= σϵA(Tenv^4 - T^4) . How is it that Pnet is negative if the environmental temp is higher than the temp of the object?
 

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  • #2
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I have a general question regarding Radiation. If the net Thermal Radiation is understood to be :

Pnet = Pabs - Prad= σϵA(Tenv^4 - T^4) . How is it that Pnet is negative if the environmental temp is higher than the temp of the object?

Because the incoming radiation has more energy than the outgoing radiation. I can't see what the problem is.
 
  • #3
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I figured it out with some help, the equation in the book and their website had the equation wrong.. the book had the temperatures flipped
 

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