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08-15-2010, 04:48 PM #27Professional Member
- Join Date
- Jun 2003
Thats why if you work on refrigeration you get calls for warm freezers when its 20 below outside. If theres not more refrigerant in the system than the condenser can hold, all the refrigerant will migrate to the condenser during the off cycle, and take on a pressure that corresponds to the outdoor temperature. When the solinoid opens on a call for cooling, the refrigerant will just sit there because it has no incentive to move to a warmer place (the freezer at 0 degrees). The compressor won't start because the pressure in the system is lower than the cut in point on the compressor. There needs to be enough refrigerant in the system so that there is always some in the indoor receiver or outdoor heated reciever if long off cycles are expected.
08-15-2010, 04:49 PM #28
There usually is a question behind these types of questions and that is what I'm interested in. It's an educational process. You asked about the sitting pressure inside a sealed system and I'm interested in what you are attempting to attempt.
Maybe there is a better way for you to find out what you are looking for. Or maybe you are on to a new science that all of us could benefit by.
By your defensive stance, I'm assuming you don't want to expose yourself to deeper questioning."The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
- Alexis de Toqueville, 1835
08-15-2010, 04:52 PM #29
I like the give and take with you on these points.
All of the things you mentioned do indeed have specific ideas assoociated with "static pressure."
In fact, that is pretty much what I was pointing out.
HVAC has a specific expectation for the words, "static pressure."
RSES Journal has an article on leak prevention in systems, and there are four of five mentions of "standing pressure," in regards to the ability of the system to hold pressure during leak testing.
And it is referenced here http://hvac-talk.com/vbb/showthread.php?t=251392 in the same vein.
..and my application of the term is used in this HVAC textbook, on page 563:
08-15-2010, 05:35 PM #30
08-15-2010, 05:48 PM #31
08-15-2010, 06:14 PM #32
I suppose that means not less than 250 psi, unless the indoor coil will rupture if the ambient gets to 110F.
08-15-2010, 06:33 PM #33
08-16-2010, 01:50 AM #34
08-16-2010, 05:34 AM #35