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Find the smallest possible mass flow rate of the air so the

A superheater brings 2.5 kg/s saturated water vapor at 2 MPa to 450^oC. The energy is provided by hot air at 1200 K flowing outside the steam tube in the opposite direction as the water, which is a counter flowing heat exchanger. Find the smallest possible mass flow rate of the air so the air exit temperature is 20^oC larger than the incoming water temperature (so it can heat it).

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