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  1. #1
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    R718 as refrigerant



    Hi sirs
    I randomly found an article for R718 water chiller. It's an interesting topic. R718 is H2o. Use water to produce chilled water. Very good. Who know this machine? Is it available for practical use? welcome input

    regards
    LC


    I hear...I forget;I see...I remember;I do...I understand

  2. #2
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    Re: R718 as refrigerant

    dear sir
    would you provide us with more detales
    please send internet site of the company who produce this kind of chiller
    regards
    afeef

  3. #3
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    Re: R718 as refrigerant

    Last edited by frank; 06-04-2006 at 09:23 AM.

  4. #4
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    Re: R718 as refrigerant

    .

    You are thinking of a Lithium Bromide / Water Absorption chiller. They've been around for most of the last century, and are still made. They tend to be very large capacity, and can capitalise on large quantities of waste heat.
    By today's criteria they have a poor efficiency profile, because of thier high reliance on direct-fired carbon fuels, but still installed. Usually they are around 1 - 1. 5mW (3-4000TR).
    I worked on a few in the 70s. The smallest one I ever commissioned was a Japanese Carrier 16JB that was considered a table-top model at 100 TR, (about 350 kW).
    LiBro is the absorbent and water is the refrigerant. The system is kept at a vacuum to promote evaporation temperatures in the order of 5 Celsius.

    The other variant of the absorption process is a slightly different technique; it uses water and ammonia. In this case the ammonia is the refrigerant and water is the absorbent.

    .
    ________
    vapir oxygen
    Last edited by Argus; 07-02-2011 at 10:01 AM.

  5. #5
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    Re: R718 as refrigerant

    Not quite. R718 can be used in a phase change chiller as the refrigerant, bu evaporating and compressing water vapour exacty as any other refrigerant.

    Applications are in the range of high evaporation temperature (+20/35°C).
    Considerations must be applied for the high expansion ratio after evaporation and low exponent, that would lead to use turbine compressors (high flow, low compression ratio).
    Liquid separation is also an issue.

  6. #6
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    Re: R718 as refrigerant

    http://www.refrigeration-engineer.co...ead.php?t=4124

    Not sure about what you saw, LC but in principle water would be great, it's a lot like ammonia i.e. high latent heat, large amount of vapour for the liquid volume.
    It's a lovely day to pump some gas

  7. #7
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    kren Guest

    Re: R718 as refrigerant

    There are developments of compression chillers using water as refrigerant. Several machines have been in the field test in the recent years. (Megawatt class, I guess). However, the compressor is very special and expensive. Therefore, economics is an issue.

  8. #8
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    Re: R718 as refrigerant

    Just went back from technical shool.R178 as refrigerant is
    a very interesting problem. Here in Denmark LEGO has buildt
    a system with water vapour compressor, they use this to
    cool down diff. machinery.
    Here in Denmark ther has been started a project to develop
    water vapour compressors.

    By the way a have a PDF file 1.8 Mb. 260 pages concerning
    water vapour compressors, so if anyone is interested just
    mail to me.

    Best regards
    Carlo Hansen

  9. #9
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    Re: R718 as refrigerant

    Hi again

    Just forget to set in this link.

    http://st-div.web.cern.ch/st-div/wor...ogy/JacekK.pdf

    Best regards
    Carlo Hansen

  10. #10
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    Re: R718 as refrigerant

    [ Will be geatful,if you can mail me the PDF file 1.8 Mb. 260 pages concerning water vapour compressors, I am interested.
    Myemail :dhaliwals@gmail.com:
    Best regards
    Dhaliwal

  11. #11
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    Re: R718 as refrigerant

    I think you can download it by the link

    rgds
    LC
    I hear...I forget;I see...I remember;I do...I understand

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