Cycle Performance Of Working Fluids For Moderate/High Temperature Heat Pump

It is significant in energy-saving and environmental impact alleviating to research and develop the moderate/high temperature heat pump technology, which commits into elevating the working temperature level of heat pumps, and would enable the energy-saving heat pump heating technology to apply to industry fields and serve the waste heat recovering.In this paper, 25 refrigerant and refrigerant mixtures were proposed as potential working fluids for the technology, which fall into HCs, HFCs, and HCFCs with zero or low ODP (Ozone Depletion Potential) and low GWP (Global Warming Potential) values, and suitable cycle parameter values in a condensing temperature range of 60 to 140°C.Both of the theoretical performance analysis on the 25 fluids in the condensing temperature range of 60 to 140°C, and the experimental performance investigation on 6 fluids, HCFC124, HCFC142b, MB3B, MB3C, MB1B and MT1C, in the condensing temperature range of 60 to 90°C with a water-to-water experimental heat pump system, were carried out with a cycle temperature lift of 45°C. It was shown that in view of the theoretical performance, all of the 25 fluids possess nice performance in the moderate/high temperature heat pump cycle. Among them, 4 HCs fluids exhibit discharge temperatures close to HFC245fa, an excellent working fluid suggested by our previous study, while the other performance parameters are dependent, more or less satisfactory compared to HFC245fa; and the other 21 fluids exhibit better comprehensive performances but higher discharge temperatures than HFC245fa. In the tests, all of the 6 mixtures delivered higher discharge temperatures, higher heating capacities and a little higher COP than HFC245fa.