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Thread: Pipe sizing....

  1. #1
    Join Date
    Dec 2007
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    Pipe sizing....

    besides the unit's info. plate, i'm trying to find info and learn why linesets are sized to legnth and why it is. Any info on where to find info would be cool. Just tryin' to learn why linesets are sized the way they are and all....

  2. #2
    Join Date
    Sep 2002
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    Refrigerant piping sizing -

    First; there are really two things moving through the two kinds of refrigerant piping: refrigerant and oil.

    Reduced refrigerant pressure reduces refrigerant density. We want to avoid this by always having the highest density refrigerant which will do the job.

    So we want to avoid pressure drops in piping to the largest extent possible. This would seem to indicate that the largest and least restrictive piping would always be for the best.

    But there are two other factors: cost and oil flow.

    Of course in liquid lines the oil moves with the refrigerant and so pressure drops and cost are the only factors. But in vapor lines the velocity must also be considered. The velocity must always be sufficient to move the oil along and have it return to the compressor or oil separator.

    Luckily all these things have long ago been worked out and graphed and curved for us. A really excellent reference for this is the RSES SAM manual's piping sections.

    Are you an RSES member? Or do you know anyone who is? The SAM manuals make for Very interesting and informative reading.
    The conventional view serves to protect us from the painful job of thinking.

  3. #3
    Join Date
    Feb 2006
    SouthEastern Virginia
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    I would recommend the different manufacturers websites. There are different guidelines for scroll vs. recip compressors. Beware!
    It might get loud!

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