A house has a composite wall of WOod, fiberglass insulation, and plaster board, as indicated in the sketch. On a cold day, the temperature and the convection heat trans- fer coefficients are Tei=20°C, h;=30 W/m²K and To=-15°C, h, =60 W/m²K. The wall surface area is 350 m². Determine the total heat loss through the wall. Conductivities are given as k,=0.038 W/m.K, k̟=0.012 W/m.K, k,=0.17 W/m.K.

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Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.