Q6. Sea water is to be used to cool engine cooling water in a single pass shell an1d tube heat exchanger. The cooling water enters the tubes at a temperature of 85°C and to be cooled to 24°C.
The flow rate of cooling water will be 2.3 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 surface area of the tubes.
The tube outside diameter is to be 90 mm.
Calculate EACH of the following:
(a) the outlet temperature of the seawater; (2)
(b) for counter flow the log mean temperature difference and area required; (6)
(c) for parallel flow the log mean temperature difference and length of tube required. (8)
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