Q6. Sea water is to be used to cool engine cooling water in a single pass shell and tube heat exchanger.
The cooling water enters the tubes at a temperature of 65℃ and to be cooled to 14℃. The flow rate of cooling water will be 2 kg/s. The sea water will enter at a temperature of 2℃ and its flow rate will be 9.5 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 8500W/m2K, based on the outside surface area of the tubes.
The tube outside diameter is to be 50mm.
Calculate 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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