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Water enters a crossflow heat exchanger (both fluids unmixed) at 16 C and flows at the rate of 7.5 kg/s to cool 10.0 kg/s

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Water enters a crossflow heat exchanger (both fluids unmixed) at 16 C and flows at the rate of 7.5 kg/s to cool 10.0 kg/s of air from 120 C. For an overall heat transfer coefficient of 225 W/m K and an exchanger surface area of 240 m, what is the exit air temperature? Taking the specific heats of the air and water to be constant at 1.014 and 4.182 kJ/kg K, respectively, we get

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