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2003 Fall Supplemental HW

# 2003 Fall Supplemental HW - CHEN 323 Homework for(Each...

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CHEN 323 Homework for 11/24/03 (Each problem valued at 20 points) (Answers are approximate because some were solved with slightly different equations from the 323 text book ) 1. 45,000 lb/hr of a 35 ° API distillate (C p = 0.6 BTU/(lb ° F)) is cooled from 250 ° F to 120 ° F using cooling water at 85 ° F. The following exchanger is available for the service: 19 ¼ ID, 1-1 exchange having 204 tubes, ¾ OD, 16 BWG, 16 0 long on 1 square pitch. Baffles are spaced 5 apart. Assuming the properties do not vary with temperature, what is the minimum cooling water flow rate that can be used to accomplish the required cooling with the existing exchanger? What modifications would you recommend for the exchanger to improve performance and decrease cooling water consumption? Additional data are as follows: a) The film coefficient (h o ) for the oil on the shell side is 125 BTU/(hr ft 2 ° F) (based on outside area) b) The combined fouling factor is 0.0033 [BTU/(hr ft 2 ° F)] -1 i) For 3/4”, 16 BWG tubes: Wall thickness = 0.065 in.

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2003 Fall Supplemental HW - CHEN 323 Homework for(Each...

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