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In a thermofluids lab, a student is analysing a prototype single-pass cross-flow heat exchanger used to...

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Mechanical Engineering

In a thermofluids lab, a student is analysing a prototypesingle-pass cross-flow heat exchanger used to cool water from 90oCto 60oC by transferring its heat to an air stream with an inlettemperature of 30oC without mixing. The water and air flow ratesare 42,000 kg/h and 180,000 kg/h respectively. Assume that for thewater cp=4.18kJ/kgâ‹…oC and for the air cp=1.02kJ/kgâ‹…oC. Calculatethe log mean temperature difference for this heat exchanger.

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