What is a Wet Bulb Temperature?

There are three temperature measurements that are very important in thermodynamics and, in particular, psychrometrics. The first is the dry bulb temperature, which will always be the hottest of the three. The dry bulb is the air temperature measured using a standard thermometer.

It is the temperature reported in daily weather forecasts and is sometimes referred to as the ambient air temperature. The wet bulb temperature uses the same standard thermometer, however, the bulb is covered with a wet cloth. As air passes over the wet cloth, the water in the cloth evaporates and cools the temperature below the dry bulb temperature.

The Dry and Wet bulb temperatures are then used together to calculate the moisture or humidity in the air. The wet bulb temperature is the theoretical limit of any evaporative cooling system or cooling tower. The final important temperature measurement is the Dew Point temperature: This is the air temperature at which the moisture in the air begins to condense or ... more.

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