Air with a wet bulb temperature of l5C and a moisture conten

Air with a wet bulb temperature of l5°C and a moisture content of 0.005 kg/kg dry air is heated until air is at a dry bulb temperature of 55°C before passing through the dryer filled with grain. The exit air from the dryer is at a dry bulb temperature of 25°C and a relative humidity of 78%. What are wet bulb temperature, dew point temperature and moisture content of both inlet air to dryer and exit air from dryer?

Solution

at the exit of drier:

WBT: 22C

DPT:20.8C

moisture content:0.0156kg/kg of dry air