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18-08-2006, 07:27 AM #1
Dose Anybody know Auto Refrigeration Cascade System
Hi, everybody! I set up a three stage ARC system to achieve the -180 F box temperature, and the refrigerant was chosen as R404A\R23\R14 mixture, the lubricating oil is synthesize POE. When run this system, I found the evaporate temp. fluctuated in a wide range, after checked the system, it has been found there was a blockage in the line by the sticky oil. I think the oil is the big problem. So, does anyone know which type oil should be used in this ARC system? Any input is appreciated!
best Rgds
ernest.Last edited by ernestlin; 21-08-2006 at 01:41 AM.
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22-08-2006, 02:11 AM #2
Re: Dose Anybody know Auto Refrigeration Cascade System
nobody knows, I may solve it by myself...
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24-08-2006, 04:25 PM #3
Re: Dose Anybody know Auto Refrigeration Cascade System
This is difficult
Last edited by Huynh Ba Dat; 24-08-2006 at 04:30 PM.
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27-08-2006, 03:23 AM #4
Re: Dose Anybody know Auto Refrigeration Cascade System
The systems I have run at such low temperatures used oil free compression on the low stages. If we did not use oil free, we used tandem carbon bed absorpsion oil separation on the compressor discharge.
For alternate oils, you might contact CPI Engineering in Michigan, USA.
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27-08-2006, 07:32 AM #5
Re: Dose Anybody know Auto Refrigeration Cascade System
They mostly add a litlle bit refrigerant with a boiling point higher then those you have used wich cleans/flushes the lines.
This refrigerant will flow as a liquid through all the separating traps of the ARS.
It's not used as a refrigerant but as as some sort of cleaning agent.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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28-08-2006, 02:59 AM #6
Re: Dose Anybody know Auto Refrigeration Cascade System
We use to do that when we had R-12 around. Worked great to get oil to come back in a low temp R-22 system. What would you suggest on this system.
Ken
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28-08-2006, 10:22 AM #7
Re: Dose Anybody know Auto Refrigeration Cascade System
POE viscosity is given in centistokes at +25° (or +40°C sometimes).
Unfortunately viscosity of a liquid is a function of temperature. a 150cSt POE oil at +40°C has a viscosity of 1200 to 1500cSt at -20°C.
The resulting molasse easily clogs channels and orifices.
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28-08-2006, 01:35 PM #8
Re: Dose Anybody know Auto Refrigeration Cascade System
I have tried using Penthene for cascade system.
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30-08-2006, 04:24 AM #9
Re: Dose Anybody know Auto Refrigeration Cascade System
Tks for your good information, pals!
Cofreth, what's the Penthene oil? Could you tell me the detail? Tks again.
ernest
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30-11-2006, 08:51 AM #10
Re: Dose Anybody know Auto Refrigeration Cascade System
I've also used a small amount of pentane but that was with mineral oil not poe. Wikipedia has info on it but I can't post the link.
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01-12-2006, 01:31 AM #11
Re: Dose Anybody know Auto Refrigeration Cascade System
Did you contact CPI Engineering in Midland, Michigan. The blend oils for all sorts of applications.
Ken
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10-01-2007, 05:43 AM #12
Re: Dose Anybody know Auto Refrigeration Cascade System
Thanks for your information.
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05-02-2007, 01:57 AM #13
Re: Dose Anybody know Auto Refrigeration Cascade System
Try a little instrument grade propane, sulfer content less than 20ppm. Also you could try adding an ounce or two of R134a into the last stage. Definatly add an oil seperator on the last stage.
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14-03-2007, 02:58 AM #14
Re: Dose Anybody know Auto Refrigeration Cascade System
Just wondering what your solution was?
And in what stage was the oil flogging up at? Because you shouldn't have any oil carry over into the 2nd or 3rd stages.Will melt ice for $101/hr
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