A laboratory oven has a cubical interior chamber \(1 \mathrm{~m}\) on a side with interior surfaces that are of emissivity \(\varepsilon=0.85\).

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 \(T_{o}=375^{\circ} \mathrm{C}\) and \(T_{\text {sur }}=20^{\circ} \mathrm{C}\), respectively. Treat the oven door as one surface and the remaining five interior furnace walls as another.

Transcribed Image Text:

To 1m' I sur