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  1. #1
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    "SPECIAL" screw compressor



    Have a process application which would run under following conditions .

    NH3 Economized VSD -33 C SST
    + 48 C SDT

    Apart from possible higher pressure rated casting would anything else have to be "SPECIAL" about it ?

    Anyone have experience ?



  2. #2
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    Re: "SPECIAL" screw compressor

    Why not a normal cascade system with NH3 on the low stage, and some other natural refrigerant on the high stage?

  3. #3
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  4. #4
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    Re: "SPECIAL" screw compressor

    Air cooled on R-717 is comparable to these conditions; considerable data on that in the IIAR technical sessions. Also more recently on using R-717 in central heat pump arrangements. Check the Vilter web site; they did nice work on a "small channel" single rotor screw for such purposes; high side to 85-deg C condensing.

    http://www.emersonclimate.com/Docume...%20Version.pdf

  5. #5
    MCR717's Avatar
    MCR717 Guest

    Re: "SPECIAL" screw compressor

    Limits on Vilter standard Single Screws are MAWP above 33 bar and pressure ratio 20:1.
    This application is within the limits, no need for their special high pressure compressors (MAWP 75 bar).

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