Wet Bulb Vs Dew Point

Posted november 3 2016 11 51 a m.

Wet bulb vs dew point.

For the saturated air the dry bulb temperature the wet bulb temperature and dew point temperature are same. The knowledge of only two of these values is enough to determine the state including the content of water vapor and the sensible and latent energy enthalpy. Dry bulb wet bulb and dew point temperatures. Higher the mositure content of the air higher is the dew point temperature.

The key difference between dewpoint and wet bulb temperature is that dewpoint temperature is the temperature to which we should cool the air to saturate the air with water vapor whereas wet bulb temperature is the temperature that we get from a moistened thermometer bulb that is exposed to air flow. A widely used device for measuring wet and dry bulb temperature is a sling psychrometer which consists of a pair of mercury bulb thermometers one with a wet sock to measure. The dew point temperature of air depends upon its mositure content. The dry bulb wet bulb and dew point temperatures are important to determine the state of humid air.

These can be calculated automatically using wildland fire rh calculator apps for ios and android available for free. At this point the air cannot hold more water in the gas form. Such an instrument is called a wet bulb thermometer. It includes a dry bulb thermometer a wet bulb thermometer and a psychrometric chart a graph that plots the relationships between the dry and wet bulb temperature relative humidity and dew point at constant pressure.

The following tables calculate dew point and relative humidity based on the observed wet bulb and dry bulb temperatures and the elevation at the site of the observation. Edt updated november 3 2016 5 10 p m. By definition wet bulb temperature is the lowest temperature a portion of air can acquire by evaporative cooling only. Wet bulb temperature vs dew point differences explained.

Wet bulb temperature is measured using a thermometer that has its bulb wrapped in cloth called a sock that is kept wet with distilled water via wicking action. The dry bulb wet bulb and dew point temperatures are important to determine the state of humid air.