Question: In a double pipe heat exchanger with a total external surface of 70 ft2 it is to be cooled aniline from 200 to 150 F.

In a double pipe heat exchanger with a total external surface of 70 ft2 it is to be cooled aniline from 200 to 150 F. For the soul used toluene current 8600 lb/h with a temperature of 100 F. The exchanger consists of a 1.25 in Schedule 40 pipe which is inside a tube 2 in Schedule 40. The flow rate of aniline is 10000 lbs/hr. (a) If the flow is countercurrent, calculate its exit temperature of toluene, the logarithmic mean temperature difference and the total coeff heat transfer. (b) Calculate the same quantities if the flow is parallel

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