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Homework Help: Figuring heat exchanger's surface temp

  1. Jan 29, 2017 #1
    1. The problem statement, all variables and given/known data
    Calculate surface temp of heat exchanger when it's heating the room with the known power of P. Room temperature T is also known, as is the heater surface area A. ε ≈ 1.

    2. Relevant equations
    P = εσAT^4 is what I've been trying to use.

    3. The attempt at a solution
    I've been trying to solve this with T = (P/σA)^0.25, but that's giving me negative surface temps which clearly can't be correct. I'm guessing the reported heating power P can't be the actual total heating power of the radiator, but I haven't been able to figure out how to go at it.
  2. jcsd
  3. Jan 29, 2017 #2
    Your equation is not correct. If the heater radiating heat to the room, then the room is also heat to the heater.
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