A hot air tunnel dryer is used to dry a filter press cake of titanium dioxide. The entering air is prepared by recycling a portion of the air discharged from the drier with fresh air at 30°C and 1...

A hot air tunnel dryer is used to dry a filter press cake of titanium dioxide. The entering air is prepared by recycling a portion
of the air discharged from the drier with fresh air at 30°C and 1 atm. The fresh air contains 0.015 kmol water/kmol dry air.
The resulting mixture contains 0.045 kmol water/kmol dry air and is heated to 120°C and fed to the drier. Twenty kilograms
per hour of water is picked up from the material being dried. The outgoing air contains 0.089 kmol water/kmol dry air and
is found to have a temperature of 75^oC at 1 atm. Find the following:
1. The fraction of the gross product air recycled.
2. The volumetric flow rate of the recycle stream in m³/min.
3. The volumetric flow rate of the fresh air in m³/min.