An air washer has a face area of 4.1 m2 and a length of 1.8 m. Ambient air at 36°C and 30% relative humidity enters the air washer with a face velocity of 2.0 msí1 . The dry-bulb temperature of the...

An air washer has a face area of 4.1 m2 and a length of 1.8 m. Ambient air at 36°C and 30% relative humidity enters the air washer with a face velocity of 2.0 msí1 . The dry-bulb temperature of the air at exit is 29°C. The temperature of the water in the air washer is 24°C. The pressure is constant at 101.3 kPa. Calculate (i) the efficiency of the air washer, (ii) the NTU, and (iii) the volumetric mass transfer coefficient hd Av.