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Thread: subcooling
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27-05-2010, 10:28 PM #1
subcooling
how do you measure subcooling
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27-05-2010, 10:33 PM #2
Re: subcooling
you convert the head pressure reading to tempreture then messure the liquid line tempreture the dif between the saturated tempreture and actual temp is subcooling
Last edited by martinw58; 27-05-2010 at 10:34 PM. Reason: extra info
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27-05-2010, 11:56 PM #3
Re: subcooling
read Refrigeration 101: by Gary
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28-05-2010, 12:39 AM #4
Re: subcooling
This not quite correct, actual sub-cooling you need to measure the liquid pressure (and convert to a saturated temperature) and measure the actual liquid temperature, the difference between the temps is the actual level of sub cooling. Sorry for being so perdantick, as this is one of my pet subjects.
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28-05-2010, 08:03 AM #5
Re: subcooling
Yes oldtimer
madfridgie is very correct as usual. A few more tips - If no access point is available at outlet of cond or liquid line allow for pressuredrop through condenser of more than about 5psi. There is nothing like an accurate measurement so get your self a superheat calculation kit like yellow jacket (ritchie) and measure the refrigerant temp and pressure directly. Even if you have to pump down the unit and weld in a schrouder port anywhere on the liquid line.
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28-05-2010, 05:41 PM #6
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29-05-2010, 10:54 AM #7
Re: subcooling
Cool tony--1
But just check it out first - the superheat calc kit measures sub cooling directly as well as superheat.
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29-05-2010, 06:19 PM #8
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02-06-2010, 05:33 AM #9
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02-06-2010, 05:43 AM #10
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02-06-2010, 06:42 AM #11
Re: subcooling
Kamusta (tagalog not to good)
Sub cooling has no direct relationship to evaporator superheat. If you have no sub cooling at the expansion valve, then you are likely to have a mix of liquid and vapour. The mix will will reduce the mass flow through the valve, causing the evaporator to be starved (not enough liquid) if the evap is starved then you will have high superheat.
I hope this is what you meant?
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03-06-2010, 04:07 AM #12
Re: subcooling
The others have measuring subcooling correct, but system needs to be fully loaded, all cond. fans running. May have to manipulate low ambient controls if cold enough outside.
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