(1) For the composite wall shown below, related thermal conductivities are given as kA = 35 W/m.K, kB = 12 W/m.K, kc = 23 W/m.K, and ko = 5 W/m.K. %3D %3! (a) Sketch the electrical resistance circuit of the composite wall. (b) Determine the steady-state heat transfer rate. (c) Determine the effective thermal conductivity for the composite walls. This makes it possible to consider the composite wall as a single material of thermal conductivity keff, rather than four different materials with four different thermal conductivities. 6 cm T2 = 22°C T1 = 300°C D 3 cm 1m 10 cm- * 20 cm 4-8 cm

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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.