A swamp cooler or misting fan is a fan that blows air in addition to a fine mist of water. Swamp coolers are often used by restaurants and bars in dry, hot climates to cool their outdoor seating areas. You want to make your own swamp cooler by attaching a water line to your fan whose inlet capacity is 85.0 ft^3/min of air. The meteorologist says that today's high temperature will be 89°F and the relative humidity will be 20%. In order for you to enjoy your outdoor patio experience the air coming out of the fan must be 78°F or cooler.
Approximate the swamp cooler's operation as an adiabatic spray cooler in order to estimate: 1 - the relative humidity of the fan's output and 2
- the minimum flow rate of water entering the fan required to operate the swamp cooler under these conditions.
What is the relative humidity of the adiabatically cooled air at 78°F?
What is the humid volume of gas at 89°F and 20% relative humidity?
What is the mass flow rate of dry air into the fan's inlet?
What is the absolute humidity of the fan's inlet air?
What is the absolute humidity of the cooled air?
What is the minimum mass flow rate of water into the swamp cooler?