Exergy analysis of R1234ze(Z) as high temperatureheat pump working fluid with multi-stage compression

Abstract

In this paper, the simulation approach and exergy analysis ofmulti-stage compression high temperature heat pump (HTHP) systemswith R1234ze(Z) working fluid are conducted. Both the single-stageand multi-stage compression cycles are analyzed to compare the systemperformance with 120°C pressurized hot water supply based uponwaste heat recovery. The exergy destruction ratios of each componentfor different stage compression systems are compared. The resultsshow that the exergy loss ratios of the compressor are bigger thanthat of the evaporator and the condenser for the single-stage compressionsystem. The multi-stage compression system has better energy and exergyefficiencies with the increase of compression stage number. Comparedwith the single-stage compression system, the coefficient of performance(COP) improvements of the two-stage and three-stage compression systemare 9.1% and 14.6%, respectively. When the waste heat source temperatureis 60°C, the exergy efficiencies increase about 6.9% and 11.8%for the two-stage and three-stage compression system respectively.

Keywords

multi-stage compression / hightemperature heat pump / heat recovery / exergy destruction / R1234ze(Z) workingfluid

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