IEA HPT TCP Annex 54 aims to promote the low-GWP refrigerant application to accelerate the phase-down of high-GWP HFCs through in-depth case studies of component optimization, providing design guidelines and real-world experiences.

This session will provide the heat pump (HP) market development information in Germany, technical trends, and characteristics of the market-available HPs; an overview of suitable heat pumps depending on the refrigerant (from the bottom), the thermodynamic process, and the system controller (to the top);  a comparison between Low GWP HFO refrigerants (such as R-454B and R-454C) for residential Heat Pumps; properties and applications of R-471A; potential benefits of shape optimized air-to-refrigerant heat exchangers for new low-GWP refrigerants; ...