A continuous dryer is designed to produce 20000 kg of product containing 5 water wet basis in a 24hour period The feed enters the dryer with 35 water wet basis The air used for drying has an inlet temperature of 20^oC and a relative humidity of 45 and is preheated to 55^oC before it is fed to the dryer The air leaved the dryer fully saturated at 32^oC

 

35. What is the relative humidity of the air entering the dryer? (A)5% (B) 10% (C) 15% (D) 20% 36. (37) What is the moisture content of the air leaving the dryer? (A)0.016 kg water/kg dry air (B)0.021 kg water/kg dry air C)o.031 kg water/kg dry air (D) 0.050 kg water/kg dry air 38. What volume flow rate of air must to be fed to the pre-heater? (A)1.6 m/s (B) 2.4 m/s (C) 3.1 m'/s (D) 3.7 m/s 39. What is the rate at which heat is added in the pre-heater? (A)146 kW (B) 143 kW (C) 161 kW (D) 172 kW