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Thermal Radiation Energy transfer

  1. Mar 22, 2010 #1
    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?
     
  2. jcsd
  3. Mar 22, 2010 #2
    Because the incoming radiation has more energy than the outgoing radiation. I can't see what the problem is.
     
  4. Mar 23, 2010 #3
    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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