Due to its environmentally satisfactory characteristics, low toxicity and favorable thermo-physical properties in sub-critical operation, carbon dioxide (CO2) is progressively being considered a preferred refrigerant for application in an indirect expansion system as a secondary fluid and also in a cascade system. for low evaporation temperature.
In comparison with other conventional systems applied at low evaporation temperature, the high volumetric cooling capacity of CO2 allows a significant reduction in the cost of compressors and refrigeration system piping. Even when applied to larger thermal loads, the CO2 potential results in the use of compressors of sizes normally found in medium-sized commercial and industrial applications.
On the other hand, its high working pressure and even when the equipment is stopped, will require the design of the compressor and safety measures to be done with special criteria.
