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Thread: Cascade -90 C

  1. #1
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    Cascade -90 C



    Greetings to all
    I retrofitted a unit cascaded to the second stage with a final temperature of -90 C. the system had a load of 1 kg with 0.1 kg R503 R12.
    I replaced the oil with oil poe, and primed, 1 kg 0.1kg R23 with R134a.
    after the test run the final temperature reaches -65 C.
    can someone help me with similar experiences?
    which you think may be the right mixture of refrigerant retrofit?
    Thank you.



  2. #2
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    Re: Cascade -90 C

    experts please help me.

    & thanks in advance

  3. #3
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    Re: Cascade -90 C

    With R134a is quite impossible to reach -90C.
    You had to use R23, but then again it is impossible to say, unless you give complete description of components, exchangers and compressors of the two stages.

  4. #4
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    Re: Cascade -90 C

    You can use ethylene for 2 steps, if you find)

  5. #5
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    Re: Cascade -90 C

    Thanks for the answers
    What do you think if I use the refrigerant R508B?

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