Experiments on binary refrigerant mixtures in heat pumps

Principles for utilization of binary mixtures and variable temperatures in heat pumps as well as the theory of a compressor heat pump are shortly examined in the report. A theoretical study on liquid cycle process and variable temperatures is made. The mixtures in the study, were the following refrigerants: R22/E181, R22/DMF, R12/R13, R22/R113, and H2O/NH3. The use of binary mixtures in a cold vaporization process was examined by a special test and measuring equipment. At least part of the waste heat of a compressor could be utilized in heating, but the compressor must be then cooled sufficiently.