Practice

In a heat-recovery plate heat exchanger, $40\,\text{gpm}$ of process water is cooled from $140$°F to $65$°F by $75\,\text{gpm}$ of domestic water entering at $50$°F. The two streams flow in counterflow, both are water, and the overall heat-transfer coefficient is $U=500\,\text{Btu/(hr-ft}^2\text{-°F)}$. The required heat-transfer area is most nearly:

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