Q1) a hot gas at 325°C flows through a metal pipe of 10 cm OD and 3 mm thick. It is insulated with a mineral wool for reducing the heat loss in such a way that the insulation surface temperature should not exceed 50°C. Determine the thickness of insulation required. Also calculate the heat loss per meter length of 21k بلا قرة العين pipe. Take the following data: h, = 25 W/m².K, ho - 10 W/m².K, T = 25°C, kpipe = 40 W/m.K, kwool 0.045 W/m. K

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