Aprocess fluid having a specific heat of 3500 j/kg · k and flowing at 2 kg/s is to be cooled from 80°c to 50°c with chilled water, which is supplied at a temperature of 15°c and a flow rate of 2.5 kg/s. assuming an overall heat transfer coefficient of 2000 w/m2 · k, calculate the required heat transfer areas using the ntu method for the following exchanger configurations: (a) parallel flow, (b) counterflow, and (c) shell-and-tube, one shell pass and two tube passes.