Two surfaces make up an enclosure where surface 1 is flat and has area A 1 , temperature T 1 and emissivity 1 Surface 2 is black and has temperature T 2 Show that the net power transfer rate (net heat flux) in W m 2 at surface 1 is given by 1 (T 1 4 T 2 4 )

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Question: 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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