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1. Sea water is to be used to cool engine cooling water in a single pass shell and tube heat exchanger. The cooling water is to enter the tubes at

a temperature of 80°C and to be cooled to 30°C. The flow rate of cooling water will be 2 kg/s. The sea water will enter at a temperature of 12 °C and its flow rate will be 12.5 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/ m?K, based on the outside surface area of the tubes. The tube outside diameter is to be 50 mm. Determine EACH of the following: a) The outlet temperature of the sea water b) The logarithmic mean temperature difference for EACH of the following cases: i.Counter flow ii.Parallel flow c) The total length of tubing required for EACH of the following cases: i.Counter flow; ii.Parallel flow.

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