The side walls of a refrigerator are made from two thin layers of sheet metal, each 4 mm thick, and with thermal conductivity of k = 72 W/m.k , and a 60-mm foam insulation with k = 0.05 W/m. k . If the inside and outside surface temperatures of the refrigerator wall are 2° C and 21° C , respectively, calculate the heat loss through an area of 1 m2 .

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