Q6. Sea water is to be used to cool engine jacket water in a single pass shell and tube heat exchanger. The jacket water enters the tubes at a temperature of 85°C and is to be cooled to 28°C. The flow rate of cooling water will be 2 kg/s. The sea water will enter at a temperature of 7°C and its flow rate will be 6.5 kg/s.
The specific heat capacities of both cooling water and sea water may be taken as 4.2 kJ/kgK. The overall heat transfer coefficient is expected to be 3000 W / m2K, based on the outside surf ace area of the tubes.
The tube outside diameter is to be 50 mm.
Determine EACH of the following:
(a) the outlet temperature of the seawater;
(b) for counter flow the log mean temperature difference and area required;
(c) for parallel flow the log mean temperature difference and length of tube required.
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