Adiabatic wet bulb temperature as defined by the AMS
- From: Adam <no@xxxxxxxx>
- Date: Wed, 26 Mar 2008 23:57:55 -0400
Hello,
Please help me to understand the definition of adiabatic wet bulb
temperature, as given here:
http://amsglossary.allenpress.com/glossary/browse?s=w&p=23
"Adiabatic wet-bulb temperature (or pseudo wet-bulb temperature): the
temperature an air parcel would have if cooled adiabatically to
saturation and then compressed adiabatically to the original pressure
in a moist-adiabatic process."
I am an engineer. I was taught to use the term "adiabatic wet bulb
temperature" to refer to what is called the "isobaric wet-bulb
temperature" by the AMS. It is the isobaric wet-bulb temperature that
is shown on psychrometric charts for the air-conditioning industry.
What is accomplished by the process in the AMS definition quoted
above?
It sounds like the air cools adiabatically as the pressure reduces
(such as when an air parcel moves to a higher elevation), but no
condensation happens.
Is some other kind of "adiabatic cooling" possible?
Is the "adiabatic wet-bulb temperature" equal to the dew point at this
cooled and saturated condition?
Then the air is re-compressed adiabatically to the original pressure.
What is the point of describing the re-compression in the definition?
Wouldn't adiabatic re-compression simply return the air to exactly its
original state?
Thanks for any clarity you may bring to the AMS defintion of the
adiabatic wet bulb temperature.
Adam
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