This paper identifies the advantages of compression resorption heat pumps for the recovery of waste heat and its upgrading to temperatures significantly above 100 oC. Experimental work illustrates the operation of the heat rejection side of the heat pump which indicates the feasibility of operation under such conditions. The experiments are mainly executed with ammonia-water as the
working fluid but additionally experiments are reported with ammonia-water-carbon dioxide as the working fluid. These last experiments indicate that the ternary mixture leads to increased performance of the heat pump. It is concluded that the relative simplicity of compression resorption heat pumps and higher performance in comparison to alternative heat pump concepts makes this heat pump type very attractive for heat recovery purposes.