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  1. #51
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    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



  2. #52
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    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?

  3. #53
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    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?

  4. #54
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    Re: Cascade Refrigeration System

    What issues you have with ha series ? What problems & reservatiions with ha series ?

  5. #55
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    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.

  6. #56
    jjzzshen's Avatar
    jjzzshen Guest

    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?

  7. #57
    bharat's Avatar
    bharat Guest

    Re: Cascade Refrigeration System

    Quote Originally Posted by ksvinod View Post
    i from electrolux , i would like to hnad over all ultracold medical cascade refirgeration system data
    regards

    vinod,india
    plz help us we r making -90 C, cascade system of 400 litrs chest type, using tecumseh comp. , please advice condenser and evoperatr design, and the length of tube in tube system.
    bharat

  8. #58
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    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.

  9. #59
    jklydr's Avatar
    jklydr Guest

    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!

  10. #60
    Dean Harold's Avatar
    Dean Harold Guest

    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.

  11. #61
    bharat's Avatar
    bharat Guest

    Re: Cascade Refrigeration System

    Quote Originally Posted by ksvinod View Post
    i from electrolux , i would like to hnad over all ultracold medical cascade refirgeration system data
    regards

    vinod,india
    vinod plz help,we want design for -80 c,280 ltr cascade system.
    Bharat, 09415157857

  12. #62
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    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=144007
    Last edited by Polypete; 16-01-2010 at 05:31 PM.

  13. #63
    bharat's Avatar
    bharat Guest

    Re: Cascade Refrigeration System

    Quote Originally Posted by bharat View Post
    vinod plz help,we want design for -80 c,280 ltr cascade system.
    Bharat, 09415157857
    is there anyone who can help me design a cascade system -80 C, 300 litrs, .

  14. #64
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    Re: Cascade Refrigeration System

    Greetings Mr. Vu,

    20 Watts cooling @ -140 C using 750VA
    See vvww.arscryo.com/MR.htm

  15. #65
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    Re: Cascade Refrigeration System

    Sorry if that link wont work, just Google "ORCA MIXED REFRIGERANT COOLER"

  16. #66
    vikas.surlekar's Avatar
    vikas.surlekar Guest

    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?

  17. #67
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    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.

  18. #68
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    Re: Cascade Refrigeration System

    Quote Originally Posted by Vincent Yu View Post
    Currently our company builds 2-stage cascade systems. Normally they are used in vacuum chamber and testing chamber. Two HP compressors are used. The system can reach -100 degree Celsius. We do have some experience to design and manufacture two-stage cascade systems.
    May I ask at what temp this system is rated for?

    Could your unit sustain a 200-250 Watt load on an evaporator that is designed and used in cooling CPU's in computers?

  19. #69
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    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.

  20. #70
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    Re: Cascade Refrigeration System

    Visit http://www.kompulsa.com/ for technology news, reviews, and more. Twitter: Kompulsa.

  21. #71
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    Re: Cascade Refrigeration System

    Hello vikas,
    You made [-140c unit?
    - 9825044534

  22. #72
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    Re: Cascade Refrigeration System

    Mr bharat
    you made[-140c unit]?
    - 9825044534

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