24 June 2014

BASIC DEVELOPMENT OF A NOVEL HIGH TEMPERATURE HEAT PUMP SYSTEM USING LOW GWP WORKING FLUIDS


A large application potential of industrial heat pumps is still not utilized due to limited supply temperatures of about 100 °C of commercially available heat pumps. If these supply temperatures could be increased, more industrial processes could be improved in their energy efficiency. The main reason for the limited temperatures is the absence of
adequate working fluids. An ideal working fluid should be non-flammable, non-toxic and should have a low GWP, no ODP and a high critical temperature. Four ideal working fluids are identified: LG6, MF2, R1233zd and R1336mzz. This paper presents the basic
development of a novel high temperature heat pump using ideal working fluids. At first, the thermodynamic properties of the working fluids and consequential operation characteristics are presented. Secondly, experimental performance investigations are presented for two
ideal working fluids at different combinations of evaporation and condensation temperatures.
The experimental results indicate a very promising performance of this novel heat pump.