In a drying process, the air is firstly heated in a heat exchanger to the temperature of 80 oC and relative humidity RH = 0.1 (point 2) before entering a dryer. The air at the inlet of the heat exchanger (point 1) and the outlet of the dryer (point 3) has the same relative humidity RH= 0.7. The air pressure is 1 bar. Determine:

(a) In a drying process, the air is firstly heated in a heat exchanger to the temperature of 80C and relative humidity RH=0.1 (point 2) before entering a dryer. The air at the inlet of the heat exchanger (point 1) and the outlet of the dryer (point 3 ) has the same relative humidity RH=0.7. The air pressure is 1 bar. Determine: (i) all parameters of the wet air at points 1,2, and 3 (humidity, enthalpy, and temperature); [4 MARKS] (ii) the mass of water in air stream entering the dryer with 200kgh1 of dry air, (kgh1) [4 MARKS] (iii) the specific consumption of air, (kg dry air/kg water removed); [4 MARKS] (iv) the mass of water removed from the wet material per hour, (kgh1); [4 MARKS] (v) the specific consumption of heat, (kJkg1). [4 MARKS]