Air at a dry bulb temperature of 20C and relative humidity of 80% is to be heated and humidifi ed to 40C and 40% relative humidity. The following options are available for this objective: (a) by passing air through a heated water-spray air washer; (b) by preheating sensibly, and then passing through a waterspray washer with recirculated water until relative humidity rises to 95% and then again heating sensibly to the fi nal required state. Determine for (a) and (b) the total heating required, the make-up water required in water-spray air washer, and the humidifying effi ciency of the recirculated spray water.

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Distillation

Distillation is a process/technique to separate more volatile components from less volatile components using the principle of relative volatility. In chemical engineering, distillation is one of the most common and important topics that is involved in almost every industry and process.