Q.5: Water is to be cooled in a packed tower from 330 to 295 K by means of air flowing counter-currently. The liquid flows at the rate of 275 cm/m² s and the air at 0.7 m³/m2 s. The entering air has a...

Extracted text: Q.5: Water is to be cooled in a packed tower from 330 to 295 K by means of air flowing counter-currently. The liquid flows at the rate of 275 cm/m² s and the air at 0.7 m³/m2 s. The entering air has a temperature of 295 K and a humidity of 20%. Calculate the required height of tower and the condition of the air leaving at the top. The whole of the resistance to heat and mass transfer can be considered as being within the gas phase and the product of the mass transfer coefficient and the transfer surface per unit volume of column (hpa) may be taken as 0.2 s-l.