If the rate of heat transfer through the wall is 1035

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Unformatted text preview: square brass plates [r 532.5 lbm/ft3 and Cp 0.091 Btu/ (lbm · °F)] that are initially at a uniform temperature of 75°F are heated by passing them through an oven at 1300°F at a rate of 450 per minute. If the plates remain in the oven until their average temperature rises to 1000°F, determine the rate of heat transfer to the plates in the furnace and the rate of entropy generation associated with this heat transfer process. 7–l24 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 7-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 entropy generation associated with this heat transfer process. Oven 900°C 3 m/min 6m Stainless steel, 30°C FIGURE P7–124 7–125 The inner and outer surfaces of a 5-m 7-m brick wall of thickness 30 cm are maintained at temp...
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This document was uploaded on 11/28/2012.

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