In a thin-walled double pipe heat exchanger, city water flows through a stainless steel tube having a diameter of 2,54 cm at a rate of 0,2 kg/s. City water is heated from 25 to 70 0C by geothermal water available at 140 0C at a flow rate of 0,3 kg/s. The heat transfer coefficients and the fouling coefficients are 4200 W/m2K and 6230 W/m2K on the city water side and 7100 W/m2K and 2270 W/m2K on the geothermal water side, respectively. You can assume that the specific heat of city water and geothermal water are the same and also its temperature dependency is negligible. (a) Determine the length of heat exchanger required to achieve the desired heating for parallel flow configuration. (b) Will the required length of tube be shorter or longer if you choose counter flow configuration?

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