An industrial process requires an atmosphere having a RH of 88.4% at 22 degree C, and involves a flow rate of 2000 m3/h. The external conditions are 44.4% RH, 15 degree C. The air intake is heated and then humidified by water spray at 20 degree C. Determine the mass flow rate of spray water and the power required for heating, if the pressure throughout is 1 bar.