Heat transfer across an insulated wall

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A wall is insulated with glass wool of thermal conductivity K= 0.046 W/m ? ^oC. What is the rate of heat loss through an area 1.0m wide by 1.8m high, insulated with a layer of glass wool 15cm thick, if the temperature difference across the layer is 20^o C?

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Rate of heat loss = rate of heat transferred across a certain area. Unit of this quantity is watts.

Rate of heat transferred is ...

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