Adiabatic Saturation Temperature

Adiabatic saturation temperature is the kind of temperature after cooling it adiabatically to saturation by evaporation of water into it, every latent heat being supplied by the volume of air. The temperature of an air sample that has passed over a large surface of liquid water in an insulated channel is the thermodynamic wet bulb temperature. This has become saturated by passing through a constant pressure ideal and adiabatic saturation chamber. Meteorologists and others perhaps employ the term isobaric wet bulb temperature to indicate to thermodynamic wet bulb temperature which also known as adiabatic saturation temperature.

The thermodynamic property

This temperature is a thermodynamic property of a blend of air and water vapor. The value denoted by an effortless wet bulb thermometer frequently offers sufficient approximation of the thermodynamic wet bulb temperature. In case of a precise wet bulb thermometer, the web-bulb temperature and the adiabatic saturation temperature are approximately equal for air-water vapor blend at atmospheric temperature and pressure. This aspect is not to be right at temperature and pressures which deviate notably from regular atmospheric conditions of for other gas-vapor blend.

The process of saturation

The process is a steady stream of unsaturated air of unknown particular humidity that is passed via a long insulated channel that includes a pool of water. As the air flows over the water, some water will vaporize and mix with the airstream. The moisture content air will increase during the process, ant it temperature will decrease because part of the latent heat of vaporization of the water that evaporates will come from the air. If the channel is long enough, the airstream will quit as saturated air at the exit temperature.

The relationship with air

The adiabatic saturation temperature is a thermodynamic property of moist air which is meant as the temperature that the air stream would achieve if it were permitted to become saturated adiabatically. The adiabatic saturation is computed by equating the enthalpy of moist air at a given temperature and corresponding humidity to the enthalpy of a saturated air-water blend at the adiabatic saturation temperature.

Saturation has relatively less affair with air or other gas that happens to be present because the relationship is a blend, not a solution such as water and honey. The air doesn't real hold the moisture despite most science texts explain it that way. The same water vapor processes work in vacuum processes where there is no air and in stream boilers also there is no air.

Questions:

• Define adiabatic saturation temperature.
• State the significance adiabatic saturation temperature.