USE OF 1,1,2,2-TETRAFLUOROETHANE IN HIGH TEMPERATURE HEAT PUMPS

摘要

Disclosed is a method for producing heating in a high temperature heat pump. The method comprises extracting heat from a working fluid in a heat exchanger, thereby producing a cooled working fluid, wherein said working fluid comprises a refrigerant consisting of 1,1,2,2-tetrafluoroethane; said high temperature heat pump comprising a centrifugal compressor. Also disclosed are a method for producing heating wherein heat is exchanged between at least two stages, a method for raising the condenser operating temperature in a high temperature heat pump apparatus, a high temperature heat pump apparatus, a method for replacing HFC-134a in a high temperature heat pump and a method for improving the energy efficiency of a centrifugal high temperature heat pump. Also disclosed are a method of producing heating and a high temperature heat pump apparatus wherein the high temperature heat pump comprises a screw compressor.