The side walls of a refrigerator are made from two thin layers of sheet metal, each 1/8...

The side walls of a refrigerator are made from two thin layers of sheet metal, each 1/8 in. thick, and with thermal conductivity of and a 2-in. foam insulation with If the inside and outside surface temperatures of the refrigerator wall are 35 °F and 70 °F, respectively, calculate the heat loss through an area of 8 ft².

Problem 11.27:

Calculate the heat transfer rate from a 1000 ft², 6-inthick concrete wall with inside and outside surface temperatures of 20 °C and 0 °C.