The following data were obtained during a test of a packed column operating at atmospheric pressure:
Height of packed section: 6 ft
Inner diameter: 12 in
Average inlet air temperature: 100oF
Average outlet air temperature: 103oF
Inlet Air Wet Bulb Temperature: 80oF
Outlet Air Wet Bulb Temperature: 96oF
Average inlet water temperature: 115oF
Average leaving water temperature: 95oF
Inlet water flow: 2000 lb / h
Inlet Air Flow: 480 ft3 / min
a) Using the inlet air conditions, calculate the humidity of the outlet air by means of an enthalpy balance, and compare the result with that obtained when using the dry bulb and wet bulb temperatures
b) Assuming that the air-water interface is at the same temperature as the sine of the liquid, calculate the motive force Yi '- Y' at the top and at the bottom of the column. Using an average of the driving force calculated earlier, estimate the value of kYa.