Problem

Analyzing Cooling Towers Liquid water at 120°F enters a cooling tower operating a...

Analyzing Cooling Towers

Liquid water at 120°F enters a cooling tower operating at steady state with a mass flow rate of 140 lb/s. Atmospheric air enters at 80°F, 1 atm, 30% relative humidity. Saturated air exits at 100°F, 1 atm. Makeup water is not provided. Determine the mass flow rate of dry air required, in lb/h, if cooled water exits the tower at (a) 80°F and (b) 60°F. Ignore kinetic and potential energy effects.

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