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Thread: Two stage system troubleshooting
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22-12-2010, 10:47 PM #51
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22-12-2010, 10:54 PM #52
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Re: Two stage system troubleshooting
I am there simply as possible source of valuable information. To me, it is much more important to gain some general knowledge on two stage cascade.
I don't have any influence on design and commission.
My primary goal is to gain some knowledge on cascades from concrete example from life.
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22-12-2010, 10:57 PM #53
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22-12-2010, 10:58 PM #54
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23-12-2010, 12:12 AM #55
Re: Two stage system troubleshooting
With a good oil separator, only a small amount of oil will be flowing through the evaporator, thus only a small amount of carrying fluid is needed.
With no separator, large amounts of oil will be flowing through the evaporator, thus large amounts of carrying fluid will be needed... enough to substantially alter the pressure/temperature relationship of the refrigerant, resulting in higher evaporating temperature and higher box temperature.
Low stage oil return is a serious problem in cascade systems, which must be addressed.
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23-12-2010, 12:27 AM #56
Re: Two stage system troubleshooting
Last edited by Gary; 23-12-2010 at 12:33 AM.
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23-12-2010, 12:50 AM #57
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23-12-2010, 08:05 AM #58
Re: Two stage system troubleshooting
In the past, we made several cascades for Meissner coils (R501/R13, R404a/R23 and R1150/R1270) and we still service +/- 20 cascade and autocascades these days. Our experience is that you must have a very, very dry system. The smallest quantity of water in the system will, together with the oil clog your system.
As Gary said, an oil separator isn't always working 100%
What's in the Visio file? The same information as in the pdf?
Is this used as a CPU cooler.It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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23-12-2010, 08:22 AM #59
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Re: Two stage system troubleshooting
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