Experimental results of a newly developed very high temperature industrial heat pump (140℃) equipped with scroll compressors and working with a new blend refrigerant

摘要

During last decades more and more attention has been paid on CO_2 emissions. One of the solutions forrndecreasing CO_2 emissions concerns the substitution of fossil fuels industrial boilers by the use of very highrntemperature electrical heat pumps. Moreover, according to the Kyoto and Montreal protocols, the CFC andrnHCFC are or will be forbidden. In that context, the developments of industrial heat pumps (HP) and newrnworking fluids with high critical temperatures are necessary. In this paper, the main refrigerants types arernconsidered for very high temperature heat pump applications (i.e. natural fluids, HFC and HFO). Performancerncalculations and CO_2 emissions impact are presented for some potential interesting fluids for high temperaturernHP applications. In a second time, the paper demonstrates the technological feasibility and reliability of a newlyrndeveloped very high temperature heat pump using a new blend as working fluid. This industrial heat pump canrnsupply hot water up to 140℃, or low-pressure steam. The performances of the machine are characterized andrnreliability is demonstrated by an ageing test campaign.