View Full Version : Coping with Varying Evaporating Temperatures on Trans Crit CO2 Systems

03-04-2019, 10:00 AM
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.

03-04-2019, 03:24 PM
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?

03-04-2019, 08:33 PM
Could a ICM valve be used as a EPR? Is it for a pack or a cubo2 type of unit?

03-04-2019, 09:19 PM
As Sean mensions, Danfoss will be able to sort you out.


Glenn Moore
04-04-2019, 12:41 AM
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