A process fluid having a specific heat of 3500J/kg.K and flowing at 2 kg/s is to be cooled from 80C to 50C with chilled water, which is supplied at a temper- ature of 15C and a flow rate of 2.5 kg/s. Assuming an overall heat transfer coefficient of 2000 W/m2.K, cal- culate the required heat transfer areas for the following exchanger configurations: (a) parallel flow, (b) counter- flow, (c) shell-and-tube, one shell pass and two tube passes, and