22 May 2008

CO2 AS REFRIGERANT, A WAY TO REDUCE GREENHOUSE GAS EMISSIONS


The potential of CO2 as refrigerant in several applications are presented. CO2
systems have already been commercialised in some applications, while systems for others
have been developed from an R&D point of view, yet others are under development. The
paper concentrates on the great possibilities CO2 systems give for reducing greenhouse gas
emissions from heat pumps, air conditioning and refrigeration systems. Direct emissions due
to refrigerant leakage and indirect emissions due to reduced power consumption are
discussed. Results from the applications heat pumps and air conditioning, commercial
refrigeration and mobile air conditioning are focused. Influence of climatic differences and
boundary conditions when comparing different alternatives are discussed. Ongoing
developments for introducing further system efficiency improvements are also presented.