8-134 Long cylindrical steel rods (r = 7833 kg/m3 and cp = 0.465 kJ/kg · °C) of 10-cm diameter are heat-treated by drawing them at a velocity of 3 m/min through a 6-m-long oven maintained at 900°C. If the rods enter the oven at 30°C and leave at 700°C, determine a) the rate of heat transfer to the rods in the oven and b) the rate of exergy destruction associated with this heat transfer process. Take T0 = 25°C. | |
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