7- Illustrates a composite wall. The wall is composed of two materials (A with kA = 1 W/m-K and B with kB = 5 W/m-K), each has thickness L = 1.0 cm. The surface of the wall at x = 0 is perfectly insulated. A very thin heater is placed between the insulation and material A; the heating element provides q" = 5000 W/m2 of heat. The surface of the wall at x = 2L is exposed to fluid at Tf, = 300 K with heat transfer coefficient in h = 100 W/m2-K. Draw a resistance network to represent this problem; and calculate the value of each resistance.

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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.