A wall measures (9x3) m2 and it consists of the following layers, the wall has one door and two windows with an area of 1.8 m2 and 3.5 m2, respectively. The wall consists of the following layers: (1) Hard stone of 70 mm thickness and k = 1.7 W/m.°C. (2) Concrete of 200 mm thickness and k = 1.75 W/m.°C. (3) Polystyrene of 50 mm thickness and k = 0.04 W/m.°C. (4) Plaster of 20 mm thickness and k = 1.25 W/m.°C. The inside and outside design conditions are (22°C, 50% RH) , and (7 °C, 90% RH) respectively, and the inside and outside film resistances are 0.12 and 0.03 m2.°C/W, respectively. Calculate the following: (a) Heat loss through the wall (b) Inside wall surface temperature. (c) Heat loss with no insulation, will the water vapor condense on 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.