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03-04-2019, 10:00 AM #1
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 +2°C with the lowest evap temp fixture at -7°C. I can't have the F&V at -7 because the Delta T to the Room (+8°C) 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.
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03-04-2019, 03:24 PM #2
Re: Coping with Varying Evaporating Temperatures on Trans Crit CO2 Systems
I'm not an expert on CO² but would a plate heat exchanger providing a secondary cooling fluid circuit for the higher temperature circuit be feasible?
Brian - Newton Abbot, Devon, UK
Retired March 2015
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03-04-2019, 08:33 PM #3
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.
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03-04-2019, 09:19 PM #4
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
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04-04-2019, 12:41 AM #5
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