Question

Atmospheric air at a dry bulb temperature of 38 degree celcius and wet bulb temperature of 18 degree celsius is humidified in an air washer. Dry bulb temperature at the exit of air washer is 24 degree celcius. Determine the percent change in the wet bulb depression at the exit of air washer

Answer 1

Dry Bulb Temperature - Tdb - can be measured with a simple thermometer as shown above.

Wet Bulb Temperature - Twb - can be measured with a standard thermometer with some wet clothing, cotton or similar, around the bulb. Note that continuously air flow around the thermometer is important to evaporate water from the wet clothing and achieve a correct wet bulb temperature.

Sufficient air movement can be achieved with a sling thermometer