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Thread: MORE POWER!!!

  1. #1
    Join Date
    Sep 2012
    Location
    northern Ohio
    Posts
    127

    MORE POWER!!!

    have a customer that does "performance testing" once each year and "equipment evaluation" reports every few years or so. there are currently two, multi reciprocating compressor, low temp, glycol chillers that are rated at 55 and 65 ton nominal capacity respectfully. each is operated around the clock for 7 day a week production at the plant. both have consistently tested at 12 to 20 percent above their ratings and have only been off line for scheduled maintenance, and not much else. "current economic conditions" have been used as a motive to increase production across the board by 20%. I have been instructed to submit "performance enhancing modifications that can be adapted to the existing equipment to meet this objective". my first suggestion of adding two mores days to each week was not even considered and now I'm told to find a "better idea". these are 20+ year old units that have had refrigerant and oil changes made since they were built, txvs have been upgraded to electronic, and both have evaporative condensers, and sub-coolers. This is my first attempt at finding somebody that knows how to get more cooling out of a system that is already overworked.

  2. #2
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,336
    And your question is.......???

  3. #3
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,457
    Add 20% more pistons...that should take of it.

  4. #4
    Join Date
    Feb 2003
    Location
    Wichita Ks
    Posts
    1,489
    give it a vfd at 72hz.
    time for another chiller.

  5. #5
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,085
    Quote Originally Posted by freonrick View Post
    give it a vfd at 72hz.
    time for another chiller.
    And dont forget to add 20% more refrigerant seeing as the compressors will be turning faster .
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  6. #6
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    876
    Put a supercharger on it with liquid injection and lots of fans to cool the heads. If you do decide to increase speed with a VFD set to a max of 72htz, don't forget to increase the voltage at least 12%. Seriously, they are doing all they can and there ain't no more. I would think you need more compressors or as was stated before larger compressors. Sounds like a good application for a couple of Danfos mags.-GEO
    Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO

  7. #7
    Join Date
    May 2011
    Location
    NC Foothills
    Posts
    73
    When the existing machines scatter you can put in some bigger ones to meet the demand. I think I deal with the same customer from the sounds of it!

  8. #8
    Join Date
    Apr 2013
    Location
    Portugal
    Posts
    18
    How much is the % of EXV opening when it´s running in max operation and the % of input power when compared to the nominal plate? If it´s below, I´ll say 70/80 %, you can increase the heatexchanger capacity. And ofcourse keep in mind if you will absorb more heat you also need to "free" it.

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