750 Valve
06-11-2003, 07:57 AM
I know Co2 was used years ago and is used today on industrial plants but has anybody worked on, designed, heard of or have seen any commercial plants using carbon dioxide as a low stage refrigerant on say a supermarket or small to medium coldstore?
My company is currently tossing up the idea of trialling a low temp rack on Co2 , approx 70 to 80 KW, -30 deg C SST, -10 deg C SCT using med temp rack as high stage/heat exchanger.
Theres gotta be a few out there already, what are the pros and cons?
It'll be weird to have a system that increases pressure on the hi side when it shuts down. Apparently we are looking at about one sixth the plant size than on R404a, thats gotta be some $$$ savings. Was thinking we should run it off the high temp rack and use -10 deg C liquid and pump it to our med temp cases, save more on refrigerant seeing we were quoted $5 per Kg for (not sure if this is correct) anhydrous medical Co2?!? You could even have propylene glycol pumped to med temp cases and CO2 heat exchanger, refrigerated by high temp rack... If you wanted to stock every fluid known to man.
My company is currently tossing up the idea of trialling a low temp rack on Co2 , approx 70 to 80 KW, -30 deg C SST, -10 deg C SCT using med temp rack as high stage/heat exchanger.
Theres gotta be a few out there already, what are the pros and cons?
It'll be weird to have a system that increases pressure on the hi side when it shuts down. Apparently we are looking at about one sixth the plant size than on R404a, thats gotta be some $$$ savings. Was thinking we should run it off the high temp rack and use -10 deg C liquid and pump it to our med temp cases, save more on refrigerant seeing we were quoted $5 per Kg for (not sure if this is correct) anhydrous medical Co2?!? You could even have propylene glycol pumped to med temp cases and CO2 heat exchanger, refrigerated by high temp rack... If you wanted to stock every fluid known to man.