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Thread: Cascade Refrigeration System
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15-04-2009, 01:58 AM #51
Re: Cascade Refrigeration System
Sawasuar, not to be rude, but I thought this was your design project. People would be willing to help by answering questions which show you had put some thought into the design.
Several of us have ideas on how to approach this project, but we are not the ones being graded.
Best of luck,
Ken
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05-06-2009, 08:12 AM #52
Re: Cascade Refrigeration System
Hi
I am trying to design a R23-R22 cascade system. I have decided to have a 5HP scroll Comp for low cycle and 10HP comp for high cycle and a Plate cascade heat exchanger and air cooled condensor. My cooling load is at most 5KW and operating temperatures are -70C for evaporating and 35C for condensing.
I have to have a tight temperature control +/-1C within the range.
I wanted to know if it is ok?!
I don`t have enough catalogues for selecting my compressor, Plate HE, TEV, Solenoid valves,...
whould you please help me?
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22-06-2009, 08:17 PM #53
Re: Cascade Refrigeration System
Hi
I am trying to design a R23-R22 cascade system. I have decided to have a 6HP scroll Comp for low cycle and 10HP scroll comp for high cycle and a Plate cascade heat exchanger and air cooled condensor. My cooling load is at most 5KW and operating temperatures are -70C for evaporating and 35C for condensing.
I have to have a tight temperature control +/-1C.
I wanted to know if it is ok?!
I don`t have enough catalogues for selecting my compressor, Plate HE, TEV, Solenoid valves,...
whould you please help me?
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24-06-2009, 01:20 PM #54
Re: Cascade Refrigeration System
What issues you have with ha series ? What problems & reservatiions with ha series ?
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29-06-2009, 07:19 AM #55
Re: Cascade Refrigeration System
For 20 Watt capacity(-140C), why not think about the pulse tube or Striling refrigerator? maybe it should be a cheaper and more convienent option for you.
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03-07-2009, 01:12 AM #56
http://www.liangdianup.com/tobacciana_z.htm
I am thinking about buying some wholesale water pipes from this company in China
but I am not sure if they are legal to bring in to the states? What are the laws on water pipes, bongs, and pipes?
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06-09-2009, 09:37 AM #57
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06-09-2009, 11:18 AM #58
Re: Cascade Refrigeration System
I built and was using (-190C)-(-196C )cryo chamber (metal treatment, cooling engine blocks 400kg a time)), using joule thompson effect (about 200watts,)
low capital cost, efficiency about 5%.
If you have a two stage system already your just about there.
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10-09-2009, 02:08 AM #59
Re: Cascade Refrigeration System
Hi Vincent,
we have some experience with 3 stage cascade system with -130C evaporating temp. Talk to your boss, we can certainly help you!
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05-10-2009, 04:26 AM #60
Re: Cascade Refrigeration System
You don't need three compressors, Sanyo does a -140 and a -150 with just one compressor. The oil is POE and Pentane mix at that temp.
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15-01-2010, 09:17 AM #61
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16-01-2010, 12:32 AM #62
Re: Cascade Refrigeration System
Anybody interested in low temperature Autocascade systems may find this article interesting. The author is Michael St Pierre, he worked many years ago with Dale Missimer, the inventor of Polycold cryocoolers. It's enjoyable reading if you're into these things!
WorldWideWeb.xtremesystems.org/forums/showthread.php?t=144007Last edited by Polypete; 16-01-2010 at 05:31 PM.
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28-01-2010, 03:28 PM #63
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28-01-2010, 03:43 PM #64
Re: Cascade Refrigeration System
Greetings Mr. Vu,
20 Watts cooling @ -140 C using 750VA
See vvww.arscryo.com/MR.htm
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28-01-2010, 03:49 PM #65
Re: Cascade Refrigeration System
Sorry if that link wont work, just Google "ORCA MIXED REFRIGERANT COOLER"
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31-01-2010, 12:58 PM #66
Re: Cascade Refrigeration System
Hi Friends,
I am Vikas. I did Charging of -86 deg C Freezer as per brochure of Manufacturer. First chargedone unknown refrigerant thru liquid line then Second refrigerant charged thru suction also inlquid state slowly as per instructions. Refrigerants were supplied by manufacturer as A and B. I got temp - 80 deg C however i was supposed to get suction of around 7 PSIG and disharge of 280 but got suction 40 PSIG and discharge 200 PSIG. the Freezer works on Autocascade and 2 nos of 3/4 HP Compressors are in parallel.
can anyone throw light on why I got 40 PSIG at suction?
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31-01-2010, 04:20 PM #67
Re: Cascade Refrigeration System
IS this a Polycold machine?
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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01-02-2010, 10:07 PM #68
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30-06-2011, 01:21 AM #69
Re: Cascade Refrigeration System
The reason you still have problem at lowest stage with the oil is because of the flock point. Flock point is when the waxes or other components of the oil turn to solid or less viscous substance. Not allowing the refrigerant to flow freely causing it to meter where ever the oil freezes at.
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11-11-2011, 12:53 AM #70
Re: Cascade Refrigeration System
This might be helpful: http://www.engr.sjsu.edu/ndejong/Multi-Pressure%20Refrigeration%20Systems.pdf
Visit http://www.kompulsa.com/ for technology news, reviews, and more. Twitter: Kompulsa.
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16-02-2012, 04:03 AM #71
Re: Cascade Refrigeration System
Hello vikas,
You made [-140°c unit?
- 9825044534
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16-02-2012, 04:04 AM #72
Re: Cascade Refrigeration System
Mr bharat
you made[-140°c unit]?
- 9825044534
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