A natural-draft cooling tower is to remove 50 MW of waste heat from the cooling water that enters the tower at 42°C and leaves at 27°C. Atmospheric air enters the tower at 1 atm with dry- and wet-bulb temperatures of 23 and 18°C, respectively, and leaves saturated at 37°C.  Determine: (a)the mass flow rate of the cooling water, (b)the volume flow rate of air into the cooling tower, and (c)the mass flow rate of the required makeup water.

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