If the rate of heat transfer through the wall is 1035

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This document was uploaded on 11/28/2012.

Ask a homework question - tutors are online