Chapter 13, Problem 13.91P

A laboratory oven bas a cubical interior chamber 1 m on a side with interior surfaces that are of emissivity $\epsilon =0.85$ .

Determine the initial rate of radiation heat transfer to the laboratory in which the oven is placed when the oven door is opened. The oven and surroundings temperatures are $T_o=375°\text{C}$ and $T_{\text{sur}}=20°\text{C}$ , respectively. Treat the oven door as one surface and the remaining five interior furnace walls as another.