a double-pipe parallel-flow heat exchanger is to heat water (cp, avg = 4180 j/kg · °c) from 25°c to 60°c at a rate of 0.2 kg/s. the heating is to be accomplished by geothermal water (cp, avg = 4310 j/kg · °c) available at 140°c at a mass flow rate of 0.3 kg/s. the inner tube is thin-walled and has a diameter of 0.8 cm. if the overall heat transfer coefficient of the heat exchanger is 550 w/m2 · °c, determine the length of the heat exchanger required to achieve the desired heating.
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ur question is too long
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