Air at 1 atm with dry-bulb and wet-bulb temperatures of 82 and 688F, respectively, enters a duct with a mass flow rate of 10 lb/min and is cooled at essentially constant pressure to 628F. For steady-state operation and negligible kinetic and potential energy effects, determine
(a) the relative humidity at the duct inlet.
(b) the rate of heat transfer, in Btu/min.
(c) Check your answers using data from the psychrometric chart.
(d) Check your answers using Interactive Thermodynamics: IT.