A single pass cross flow heat exchanger is used to cool jacket water (c p 1 0 Btu lbm middot deg F) of a diesel engine from 190 deg F to 140 deg F, using air (c p 0 245 Btu lbm middot deg F) with inlet temperature of 90 deg F Both air flow and water flow are unmixed If the water and air mass flow rates are 92,000 lbm h and 400,000 lbm h, respectively, determine the log mean temperature difference for this heat exchanger Air flow (unmixed) Water flow (unmixed)

Question: A single-pass cross-flow heat exchanger is used to cool jacket water (c p = 1.0 Btu/lbm·°F) of a diesel engine from 190°F to 140°F, using

A single-pass cross-flow heat exchanger is used to cool jacket water (c_p= 1.0 Btu/lbm·°F) of a diesel engine from 190°F to 140°F, using air (c_p= 0.245 Btu/lbm·°F) with inlet temperature of 90°F. Both air flow and water flow are unmixed. If the water and air mass flow rates are 92,000 lbm/h and 400,000 lbm/h, respectively, determine the log mean temperature difference for this heat exchanger.

Air flow (unmixed) Water flow (unmixed)

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