Natural refrigerants CO2, ammonia and hydrocarbons have been used in different HVAC & R applications for many years. With the exception of a few sectors, their market penetration has remained relatively low.
Companies want more and more less volume of refrigerant in their installations. That is why they often opt for indirect systems. Generation and distribution of heat and cold are separated from each other. For example, this trend ensures that Propane Chillers are gaining more attention.
The use of natural refrigerants is certainly not new. Way back in the last century and even the century before that, air, ammonia (NH3), carbon dioxide (CO2), propane (R290), sulphur dioxide (SO2) and other refrigerants were used.