Q16. 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/kg K. The overall heat transfer coefficient is expected to be 3000 W/m2 K, bared 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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