The wet feed material to a continuous dryer contains 50 wt% water on a wet basis and is dried to 27 wt % by counter-current air flow. The dried product leaves at the rate of 662.25 kg dry solid/h. Fresh air to the system is at 25.6°C and has a humidity of H = 0.007 kg H20/kg dry air. The moist air leaves the drier at 37.8°C and H = 0.020 and part of it is recirculated and mixed with the fresh air before entering a heater. The heated mixed air enters the dryer at 65.6°C and H = 0.010. The solid enters at 26.7°C %3D %3D and leaves at 26.7°C. Calculate i. the flowrate of the fresh air ii. the percentage of the air leaving the dryer that is recycled

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