outside air at 50 f, 1 atm, and 40% relative humidity enters an air conditioner operating at steady state with a mass flow rate of 3.3 lb/s. the air is first heated at essentially constant pressure at 90 f. liquid water at 60 f is then injected bringing the air to 70 f, 1 atm. determine the rate of heat transfer to the air passing through the heating section in btu/s. b) the rate water is injected in lb/s. c) the relative humidity at the exit of the humidification section.