A dryer produces 400 lbs/hr of product containing 8% water when the feed contains 125% water (dry basis). Supply air to the dryer is at 212 deg F, 100 deg F dew point, leaving air is at 150 deg F, 60% RH. Part of the leaving air is mixed with the fresh air supplied at 70 deg F, 52 % RH ahead of the heater. neglecting the heat lost by radiation and used in heating the solid, the conveyor trays,etc. What is the air requirement of the dryer (dry basis, lb dry air/hr)? a. 5220 b. 2250 c. 5000 d. 22500 What is the heat requirement in btu/hr of the dryer ? a. 570700 b. 522720 c. 507200 d. 527220 How much heat in btu/hr is supplied to the air in the dryer ? a. 490500 b. 405590 c. 505900 d. 450450