Question 5 Heat transfer A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and heigh 1 m was designed to maintain a set temperature of 6 °C. The bodies consist of two 10- mm-thick layers of Aluminium (k = 225 W/mK) separated by a 30 mm polyurethane insulation (k=0.028 W/mK). If the average convection heat transfer coefficient at the inner and outer surfaces are 11.6 W/m2K and 14.5 W/m2K respectively, calculate: Data: Hgt = L2 = ho= W = k2 = , h; = , L1 = L3 =D , To1 = m, k1= k3 = Tw2 = Area= 5.1 the individual resistance(R) for each thermal layer, as well as for the total of the refrigerator,

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.