Air Temperature
The behavior of the air varies depending on its temperature. As noted earlier, the higher the temperature, the greater its ability to retain moisture. Air temperature is measured with a thermometer. Several different scales are used, including Fahrenheit, Celsius and Kelvin.
Temperature Dry Bulb
Human comfort and health are greatly depending on air temperature. In air conditioning, air temperature, usually specified temperature dry bulb (dB). It is taken with a sensitive element of the thermometer in the dry state. This temperature is normally reported.
Wet Bulb Temperature
If moist wick is over the thermometer bulb evaporation of moisture from the wick will be below the thermometer reading. This temperature is called the wet bulb temperature. If the air around the dry and wet bulb, evaporation from moist wick will be fast. If the air is very humid, evaporation will be slower.
When the air is saturated, the water evaporates from a fabric of the wick, and the wet and dry bulb temperature are identical.
However, if the air is not saturated, the water will evaporate from the wick. In doing so, it will be lower wick temperature. Then the heat will flow from the mercury to wet the wick and will read below.
Wet bulb reading depends on how quickly the air passes over the bulb. Speeds of up to 5000 ft/min (60 MI/hr.) - best available. Also, on a damp must be protected from the radiating heat the surface. Cans includes radiators and electric beaters. Error 15% may be made if the air movement is too slow, or if too much of the radiant heat is present...
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Air-Conditioning