What is the adiabatic saturation temperature?

Question

Can anyone explain it in a more tangible way than pure thermodinamics? Maybe some examples of when do a system reaches this temperature or something like that.

Answer 1

An example: When air rises, it cools adiabatically due to decreasing pressure, and when it reaches the saturation temperature (dewpoint) it turns into a cloud.

Answer 2

Saturation of water vapor (steam) occurs when the maximum amount of moisture is present as a vapor and condensation has not occurred. There is a relationship between the temperatures and pressures at which this occurs. For a given pressure it can be represented graphically by a saturation curve which shows that maximum amount of moisture which can occur at the various temperatures. So there is not one saturation temperature, but many, depending on the moisture content and the pressure.
Most commonly the gas is air and the pressure is atmospheric. The psychrometric chart shows these various relations of water vapor mixed in air at various temperatures and ratios.
Saturation has nothing much to do with the air or other gas that happens to be present because the relationship is a mixture, not a solution like honey and water. The air doesn't reall "hold" the moisture even though most science texts explain it that way. The same water vapor processes wotk in vacuum processes whrer there is no air and in stram boilers where there is no air.
Saturation of a gas and steam vapor mixture can occur :
1. Sensibly, by the removal of heat while the absolute moisture content remains the same;
2. Isothermally, by the addition of moisture while the temperature of the mixture remains the same;
3. Adiabatically, where the sensible heat given up by the mixture equals the latent heat of the moisture being added.
Shown on the Psych. chart, the sensible process is a horizontal line, the isothermal process is a vertical line and the adiabatic proces is a sloping line at about a 45 deg. angle

Answer 3

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RE:
What is the adiabatic saturation temperature?
Can anyone explain it in a more tangible way than pure thermodinamics? Maybe some examples of when do a system reaches this temperature or something like that.

Answer 4

this two are pretty much similar. When a relatively dry air having a dry bulb temperature T1 passes through a long channel containing water part if the water will evaporate and mix with the air increasing the moisture to 100% relative humidity at this point you will have a temperature T2 called the adiabatic saturation temperature. i.e. because the process is adiabatic the heat used to evaporate the water comes only from the latent heat of water and air them selves and the air will be saturated at T2 hence the name given to T2. the other way of knowing this temperature T2 is by measuring it with what we call a wet bulb thermometer where the bulb of a thermometer is covered with a wet "sock". the water from the wet sock will evaporate when air passes over it and there will be a loss in temperature which will be read by the thermometer giving a wet bulb temperature aka adiabatic saturation temperature..

Answer 5

An adiabatic process is one in which no heat flows into or from the system...it is perfectly insulated... but thermal changes can occur within the system.

If partly saturated air enters an insulated chamber which contains water at the wet bulb temperature of the incoming air, over some period of time, the incoming air then becomes fully saturated with water and leaves at a temperature equal to the wet bulb temperature of the incoming air.
So the air has cooled down to the wet bulb temperature as water evaporates into it.
This works only for steam-air mixtures, not for other gases.

Answer 6

It's the temperature at which water, by evaporating into air, caan bring the air to saturation at the same teperature adiabatically( no heat loss).