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  1. #1
    Join Date
    Jul 2007
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    Flemington, NJ
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    Building a 3 stage cascade



    Hey all,
    Just joined up here after poking around and already see this is much better then XS, much friendlier too.
    I am currently about to begin working on a three stage cascade for Sdumper, I've done plenty of two stagers, but will be getting r14 involved in this build.

    The parts;
    Stage One:
    Another 3/4-7/8hp Tecumseh Rotary compressor
    Chilly1 Cascade condenser
    Receiver
    TXV
    Plate HX Possibly, though might do a standard 1/4" in 1/2" depending on copper prices
    And all that jazz of T's and pipework and filters and such
    r507a

    Stage Two: Sdumpers Rotary single stage de-commissioning

    3/4-7/8hp Tecumseh Rotary compressor
    Chilly1 Single stage condenser, or the original condenser without fan in front of condenser fan
    Temprite 304 Oil separator
    Packless 1k-Burst Hand Valve
    (Into the HX)
    Receiver
    TXV
    Plate HX
    r1150
    Safety cut-off, relief, expansion tank, de-composite pressure relief

    Stage Three: Tecumseh 1.125hp Rotary
    Half of original condenser as desuperheater, plus large coil
    Temprite 304 Oil separator
    Packless 1k-Burst Hand Valve
    (Into Second HX)
    (Into subcooler)
    Capillary to Subcooler and evaporator)
    Kayl Evaporator on 24" Braided Flexible Line
    r14 + r740
    Safety cut-off, relief, expansion tank, de-composite pressure relief

    I'm now considering moving the large 1.125hp Tecumseh to the first stage, what do you think all? I will be building this stage by stage and any help is appreciated as I am semi expecting at least one or two problems to start occuring.



  2. #2
    Join Date
    Apr 2006
    Location
    Not so sunny coast (BC Canada)
    Age
    35
    Posts
    1,646
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    Re: Building a 3 stage cascade

    They will have no clue whom chilly1 is nor The other guy Noob, They like all the juicy data!

    Give em the link to the Xs thread so They can see who chilly1 is and such.

    Oh and welcome to the best site on the web

  3. #3
    Join Date
    Oct 2002
    Location
    Hampshire
    Posts
    160
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    16

    Re: Building a 3 stage cascade

    They..they, who's they, I bet a bottle of beer there maybe a few more of us here than you think that have a better idea inside XS and such forum

  4. #4
    Join Date
    Apr 2006
    Location
    Not so sunny coast (BC Canada)
    Age
    35
    Posts
    1,646
    Rep Power
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    Re: Building a 3 stage cascade

    They are the ones whom doen't know though! So you are not they!

  5. #5
    Join Date
    Oct 2002
    Location
    Hampshire
    Posts
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    16

    Re: Building a 3 stage cascade

    Deep down I knew where you were coming from fella
    I just had a pedantic moment there!

    I wish you the best of luck with the build NoL, it will be interesting to see some results.

  6. #6
    Join Date
    Jul 2007
    Location
    Flemington, NJ
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    Re: Building a 3 stage cascade

    Moved largest compressor to first, floated AC&R oil sep for third, still going with temprite on second, starting actual build and layout very soon.

  7. #7
    Join Date
    Dec 2007
    Location
    London
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    Re: Building a 3 stage cascade

    Quote Originally Posted by NoL View Post
    Moved largest compressor to first, floated AC&R oil sep for third, still going with temprite on second, starting actual build and layout very soon.
    Hi Nol,

    What stage have you reached with this build?

  8. #8
    Join Date
    Jul 2007
    Location
    Flemington, NJ
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    Re: Building a 3 stage cascade

    Been done a few months actually, held into -122C @ 250W, -126C @ 200W, and -151C unloaded.
    R14 final stage with a slight argon tinge.
    Switched third stage to a temprite 902.

  9. #9
    Join Date
    Dec 2008
    Location
    Lebanon, PA
    Posts
    25
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    Re: Building a 3 stage cascade

    Impressive results, was a subcooler used with the r14 and argon? I've found simply wrapping capillary tube can do it, however you acheive no where near the level of argon saturation as you could with a subcooler or suction line heat exchanger transferring to the pre metering device line.

  10. #10
    connellpaul's Avatar
    connellpaul Guest

    Re: Building a 3 stage cascade

    Hi
    Really interested to here about your project.
    We have a company in England building freeze driers and Vacuum cold Traps.
    I Design and build 3 stage cascades but not as cold as yours. Only 3 stage for the duty. R23, R507 and R134a. Top stage just to use it as a heat pump in the system.
    I have used R1150 but never R14.
    I used Reciprocating compressors but would love to get my hands on some rotary compressors.

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