At steady state, a device for heating and humidifying air
Chapter 12, Problem 12.91(choose chapter or problem)
At steady state, a device for heating and humidifying air has \(250 \mathrm{ft}^{3} / \mathrm{min}\) of air at \(40^{\circ} \mathrm{F}\), 1 atm, and 80% relative humidity entering at one location, \(1000 \mathrm{ft}^{3} / \mathrm{min}\) of air at \(60^{\circ} \mathrm{F}\), 1 atm, and 80% relative humidity entering at another location, and liquid water injected at \(55^{\circ} \mathrm{F}\). A single moist air stream exits at \(85^{\circ} \mathrm{F}\), 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.
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