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  1. #1
    Join Date
    Jan 2015
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    Help Picking Cost Effective Propane Refrigeration Compressor



    Hello,

    I am wondering if someone could help me out. I am looking to pick two propane compressor for a refrigeration skid. The flowrates seem to be too small for some of the larger propane compressor manufacturers (i.e. Mycon) and too large for conventional HVAC. Could someone steer me to a good choice? Here are the process conditions:

    Primary Compressor
    ACFM: 130
    PSuction: 30 psig
    PDischarge: 62 psig
    TSuction: 21 F

    Secondary Compressor:

    ACFM: 22
    PSuction: 57 psig
    PDischarge: 180 psig
    TSuction: 35 F

    Thanks again for your help.



  2. #2
    Join Date
    May 2012
    Location
    England
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    Re: Help Picking Cost Effective Propane Refrigeration Compressor

    .

    You don't need Propane compressors.

    Any compatible one will do. R404a as a refrigerant is
    very similar to Propane and R404a compressors are
    the normal compressor for R290 (Propane).

    Just make sure you get one with the correct electrics
    to start the thing. The relay and Klixon need to be self
    contained and or spark proof.

    Rob

    .
    .. ... -. .----. - / -- --- .-. ... . / -.-. --- -.. . / --. --- --- -..

  3. #3
    Join Date
    Oct 2007
    Location
    sweden
    Posts
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    Re: Help Picking Cost Effective Propane Refrigeration Compressor

    Be sure you have enough super heating on suction side ( take heat from liquid line to TXV) ie. if super heat is to low and compressor is efficient (high isentropic value) - propane suction gas can make steam under compression moment ie. high thermal capacity in propane itself and dilute oil on surfaces in cylinder and wears increase.

    R1270 (propylene) have more heating in compress stage and not so sensitivity on low SH, but also little lower theoretical COP

    Remember if using R404A, R407C or R22 compressors - is not primary designed for propane and not thinking on 'cold' gas as R290 on compression even if R404A is closest to R290 in thermal capacity and you self need make some quirks as enough high superheat before compressor suction port by design.

    We have in Sweden lot of ruined extahust air heatpump with propane charge after to short time running and big part of mess is not thinking about superheat of suction line and other oil manage error and give propane filled machine bad reputation, but really is design mistake from manufacture side, not a Propan as refrigerant.
    Last edited by xxargs; 29-01-2015 at 11:58 AM.

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