Cooling water from a power plant steam condenser enters a cooling tower at 307 K (93 F) with a flow rate of 3500 kg/s. The water exits the tower at 295 K (71.4 F). Air enters at the base of the tower at 290 K (62.4 F) with a relative humidity of 32% and exits at the top, saturated, at 304 K (87.6 F). Make-up water is provided at 295 K (71.4 F). The pressure in the tower is 96 kPa. Determine the flow rate of the make-up water and the flow rate of the air (on a dry air basis) through the tower.

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Cooling tower. Condenser Tair,out = 304 K Pout = 100% TH₂0.in = 307 K mH₂0,in = 3500 kg/s TH₂0,out = 295 K TH₂0,make-up = 295 K in H₂0,make-up = ? Tair,in = 290 K in = 32%