Question: A wall surface on a house is at 30C with an emissivity of = 0.7. The surrounding ambient to the house is at 15C, average

A wall surface on a house is at 30°C with an emissivity of ε = 0.7. The surrounding ambient to the house is at 15°C, average emissivity of 0.9. Find the rate of radiation energy from each of those surfaces per unit area.

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