Originally Posted by hvac5646
I'll take this one for Uncle....
You sure about that?
After all, we are talking resi, not industrial or heavy commercial where a 20 cfm vac pump would be used.
Beenthere, you are agreeing with the gent from Howell..care to lay down some empirical data to prove your point.
Speak now or forever hold your peace.
There is no real thermal mass. Only the small are where the moisture is laying at.
You can put water in a baby food jar and freeze it by vacuuming it. or use the largest mason jar you can find. It will freeze when vacuumed quickly. Done it already. there are several videos on youtube.
paytonhvac has one of the vids on it. Along with another member from over there.
As NiNe 0 said, no thermal mass since there is no heat in a vacuum(no sound either).
On those systems that the vacuum keeps rising to 1000 microns. often its because the moisture did freeze and you are now seeing it thaw, or sublimation occurring.