Considering Air-Conditioning Applications At steady state, a device for heating a...

Considering Air-Conditioning Applications

At steady state, a device for heating and humidifying air has 250 ft³/min of air at 40°F, 1 atm, and 80% relative humidity entering at one location, 1000 ft³/min of air at 60°F, 1 atm, and 80% relative humidity entering at another location, and liquid water injected at 55°F. A single moist air stream exits at 85°F, 1 atm, and 35% relative humidity. Using data from the psychrometric chart, Fig. A-9E, determine

(a) the rate of heat transfer to the device, in Btu/min.

(b) the rate at which liquid water is injected, in lb/min.

Neglect kinetic and potential energy effects.