Example 2.7 The outside diameter of a mild steel pipe is 12-cm, and the inside diameter is 11-cm. The pipe carrying chilled water is covered with 2-cm thickness layer of glass wool and 1.5-cm layer of asbestos. The temperature on the inside pipe surface is 5°C and on the outside insulation surface is 25°C. Calculate the rate of heat flow per unit length across the pipe wall. The thermal conductivities are Mild steel = 63 W/m.K, Glass wool = 0.036 W/m.K Asbestos = 0.58 W/m.K. What will be the temperature of the outer surface of the steel pipe?

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