Steam at 250C flows in a stainless steel pipe (k = 15 W/m.K) whose inner and outer diameters are 4
Steam at 250°C flows in a stainless steel pipe (k = 15 W/m.K) whose inner and outer diameters are 4 cm and 4.6 cm, respectively. The pipe is covered with 3.5-cm-thick glass wool insulation (k = 0.038 W/m.K) whose outer surface has an emissivity of 0.3. Heat is lost to the surrounding air and surfaces at 3°C by convection and radiation. Taking the heat transfer coefficient inside the pipe to be 80 W/m2. K, determine the rate of heat loss from the steam per unit length of the pipe when air is flowing across the pipe at 4 m/s. Evaluate the air properties at a film temperature of 10°C and 1 atm.
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