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6.6, 7,000 lb/hr of aniline is to be heated from 100 to 150 by cooling 10,000 lb/hr of toluene with an initial temperature of 185F

6.6, 7,000 lb/hr of aniline is to be heated from 100 to 150℉ by cooling 10,000 lb/hr of toluene with an initial temperature of 185°F in 2- by 1-in. IPS double pipe hairpin exchangers 15 ft long. Pressure drops of 10 psi are allowable, and a dirt factor of 0.005 is required. (a) How many hairpin sections are required? (b) How shall they be arranged? (c) What is the final dirt factor?

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