Evaluate what is the emissivity of the wall

Reference no: EM13559568

The concrete wall of a building is 0.14 m thick. Thetemperature inside the building is 22°C, while the temperatureoutside is 0.0°C. Heat is conducted through the wall. When thebuilding is unheated, the inside temperature falls to 0.0°C,and heat conduction ceases. However, the wall does emit radiantenergy when its temperature is 0.0°C. The radiant energyemitted per second per square meter is the same as the heat lostper second per square meter due to conduction. What is the emissivity of the wall?

Reference no: EM13559568

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