Question

A hot toluene stream, which has mass flow rate of 8.0 kg/min, is cooled by cooling water in a cocurrent heat exchanger; its temperature drops from 90o C to 60o C after passing through the heat exchanger. The cooling water stream has a mass flow rate of 10 kg/min and an inlet temperature of 20o C. Given that the specific heats of toluene and water are 0.41 and 1.00 kcal/(kg.o C), respectively, determine (a, 3%) the heat duty of the heat exchanger, (b,3%) the temperature of the cooling water leaving the heat exchanger, (c, 3%) the log mean temperature difference (or "driving force") for the heat exchange process, and (d, 3%) the UA value of the heat exchanger. Assume a negligible heat loss to the surroundings.

Answer 1

Complete Question

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Answer:

a) The duty of the heat exchanger is given as 6.8658 KJ /sec

b) The temperature of the water leaving the exchanger is TOUT = 29.84 ⁰C

c) The log mean difference is given as TZ = 47.317 ⁰ C

d) the UA value is UA = 145.10

Step-by-step explanation:

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