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A thin-walled double pipe counter flow heat exchanger is to be used to cool oil (cp...

A thin-walled double pipe counter flow heat exchanger is to be used to cool oil (cp = 2200 j/kg*K) from 150 ℃ to 30 ℃ at a rate of 2.1 kg/s by water (cp= 4180 J/kg*K) that enters at 20 ℃ at a rate of 1.2 kg/s. The diameter of the tube is 2.5 cm, and its length is 10 m.

Using Excel (a) Determine the overall heat transfer coefficient of this heat exchanger. (b) Investigate the effects of oil exit temperature (30 ℃ to 70 ℃) on the overall heat transfer coefficient of the heat exchanger.

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