CO2 which called R744, widely used as a refrigerant in refrigeration system.
It's impact on the greenhouse effect is very low.
As it's working pressure could reach 40 Mpa, so for co2 evaporator we suggest to use stainless steel tube. VRcooler is a professional manufacturer of stainless steel tube evaporator coil.
Specification of co2 evaporator coil: