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Two surfaces make up an enclosure where surface 1 is flat and has area A 1 , temperature T 1 and emissivity 1 . Surface

Two surfaces make up an enclosure where surface 1 is flat and has area A1, temperature T1 and emissivity 1. Surface 2 is black and has temperature T2. Show that the net power transfer rate (net heat flux) in W/m2 at surface 1 is given by 1(T14-T24).

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