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  1. #1
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    Single stage -40 C



    Hello, I have a small fridge and I need 1,5 kW of refrigeration power when it's temperature is -40C. What kind of gas would you use?

    I tried with R404A, but the temperature can't reach -40C.

    Any idea?

    Thank you!



  2. #2
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    Re: Single stage -40 C

    first you need a compressor that can reach -40, I would suggest R-507 or R-410A.

  3. #3
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    Re: Single stage -40 C

    Yes, it was the following question
    What compressor should I use?

  4. #4
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    Re: Single stage -40 C

    A compressor with 1.5 KW capacity at -45C evaporating temp.

  5. #5
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    Re: Single stage -40 C

    Yes, but I didn't find anything with this specs. Can you suggest me something? (reciprocating or scroll)

  6. #6
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    Re: Single stage -40 C

    Check Bitzer and Copeland semi hermetic two stages low temp.

  7. #7
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    Re: Single stage -40 C

    CO2 machine Bitzer, Dorin..
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  8. #8
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    Re: Single stage -40 C

    Quote Originally Posted by chemi-cool View Post
    A compressor with 1.5 KW capacity at -45C evaporating temp.
    I think 1.5 kW capacity at -47C evaporating temperature... and it's may be two stage semihermetic compressor on R507/404
    In some places will have to think ...

  9. #9
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    Re: Single stage -40 C

    You building a complete circuit or salvaging a small fridge or? 2-stage compounded will get you there and can be built up from pretty much stock pieces. Autocascade is the easiest overall arrangement but you would be buying a complete lab fridge.....Not something you want to design as a One-off.

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