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3. A furnace of 70 - by 60 - by 90cm inside dimensions is constructed of a material having 2 thermal conductivity of 1W/mC. The

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3. A furnace of 70 - by 60 - by 90cm inside dimensions is constructed of a material having 2 thermal conductivity of 1W/mC. The wall thickness is 15cm. The inner and outer sarfict temperatures are 260 and 38C, respectively. Calculate the heat loss through the fumsos wall. (7 Points)

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