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A process industry employs a counter-flow heat exchanger to cool 0.8 kg/s of oil (CP = 2.5 kJ/kg K) from 120°C to 40°C by the use of water entering at 20°C. The overall heat transfer coefficient is estimated to be 1600 W/m2K. It is assumed that the exit temperature of water will not exceed 80°C. Using NTU method and taking NTU = 4 in this case, calculate the following:

(i)   Mass flow rate of water.

(ii)  Surface area required.

(iii) Effectiveness of heat exchanger.

                                                                    

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