It is desired to cool water from 42°C to 30°C. The natural draft cooling tower has the capacity to remove 80 MW of heat from the cooling water. Atmospheric air enters the tower at 1 atm, Tbs=23°C and Tbh=16°C. The air outlet conditions are 32°C and 90% relative humidity. Determine:
a) the mass flow of dry air passing through the tower (kg/min)
b) the mass flow rate of entering water (kg/min)
c) the mass flow of make-up water (kg/min)