7th Edition

ISBN: 9780470501979

Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine

Publisher: Wiley, John & Sons, Incorporated

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Chapter 11, Problem 11.67P

Exhaust gas from a furnace is used to preheat the combustion air supplied to the furnace burners. The gas,which has a flow rate of 15 kg/s and an inlet temperatureof 1100 K, passes through a bundle of tubes, while theair, which has a how rate of 10 kg/s and an inlet temperature of 300 K, is in cross flow over the tubes. Thetubes are unfinned, and the overall heat transfer coefficient is 100 W/m 2 ⋅ K . Determine the total tube surfacearea required to achieve an air outlet temperature of850 K. The exhaust gas and the air may each beassumed to have a specific heat of 1075 J/kg ⋅ K .

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Chapter 11, Problem 11.66P

Chapter 11, Problem 11.68P

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