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A counter-flow double-pipe heat exchanger is heating water from 20 to 80 C at a rate...

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Mechanical Engineering

A counter-flow double-pipe heat exchanger is heating water from20 to 80 C at a rate of 1.2 kg/s. The heating is provided by waterat 160 C and a rate of 2 kg/s. The inner tube has a diameter of 1.5cm, and the U is 640 W/m2 K. Use the effectiveness-NTU method todetermine the length of the heat exchanger required.

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