A house has a composite wall of wood (k = 0,12 W/(m.K), fiberglass insulation (k = 0,038 W/(m.K), and plaster board (k = 0,17 W/(m.K), as indicated below. On a cold winter day the convection heat transfer coefficients are ho= 57 W/(m2.K) and hi = (42 W/m2.K). The total wall surface area is 450 m2. (a) Determine a symbolic expression for the total thermal resistance of the wall, including inside andoutside convection effects for the prescribed conditions. (b) Determine the total heat loss through the wall.        (c) If the wind were blowing violently, raising ho to 350 W/(m2.K), determine the percentage increase in the heat transfer rate. (d) What is the controlling resistance that determines the heat transfer through the wall?

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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.