# An automobile radiator may be viewed as a cross-flow heat exchanger with both fluids unmixed. Water,...

###### Question:

An automobile radiator may be viewed as a cross-flow heat exchanger with both fluids unmixed. Water, which has a flow rate of 0.055 kg/s, enters the radiator at 400 K and is to leave at 330 K. The water is cooled by air that enters at 0.75 kg/s and 300 K. If the overall heat transfer coefficient is 180 W/m2.K, what is the required heat transfer surface area, in m?? Assume that TC,0 = 320K when evaluating the properties of air. A = i m2

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