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  1. #1
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    Coping with Varying Evaporating Temperatures on Trans Crit CO2 Systems



    I have a scenario whereby I have multiple evaporators operating on the same CO2 condensing unit with widely varying evaporating temperatures.

    I don't know of anyone that offers an EPR valve suitable for high pressures so wonder how I can control the evaporating temperatures in the highest evaporating systems.

    F&V evaporator is at +2C with the lowest evap temp fixture at -7C. I can't have the F&V at -7 because the Delta T to the Room (+8C) is too wide and could dry product.

    I could separate the F&V evaps onto their own condensing units but I need to keep the number of condensing units to a minimum for economic and space reasons.

    Any help/advice would be very much appreciated.



  2. #2
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    Brian_UK is online now Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: Coping with Varying Evaporating Temperatures on Trans Crit CO2 Systems

    I'm not an expert on CO but would a plate heat exchanger providing a secondary cooling fluid circuit for the higher temperature circuit be feasible?
    Brian - Newton Abbot, Devon, UK
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  3. #3
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    Re: Coping with Varying Evaporating Temperatures on Trans Crit CO2 Systems

    Could a ICM valve be used as a EPR? Is it for a pack or a cubo2 type of unit?
    Last edited by seanf; 03-04-2019 at 08:46 PM.

  4. #4
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    Re: Coping with Varying Evaporating Temperatures on Trans Crit CO2 Systems

    As Sean mensions, Danfoss will be able to sort you out.

    http://files.danfoss.com/TechnicalIn...dbook_DILA.pdf

  5. #5
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    Re: Coping with Varying Evaporating Temperatures on Trans Crit CO2 Systems

    You can use either a combination of a Danfoss ICS valve with a CVP (HP) pressure pilot valve as a simple back pressure control valve , or an ICM valve with an ICAD motor plus an electronic controller such as an EKC 361 with a PT1000 temperature sensor for remote control applications . Did this on many supermarket CO2 systems in the UK

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