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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

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Front. Energy    2017, Vol. 11 Issue (4) : 493-502    https://doi.org/10.1007/s11708-017-0510-6
RESEARCH ARTICLE
Exergy analysis of R1234ze(Z) as high temperature heat pump working fluid with multi-stage compression
Bin HU, Di WU, L.W. WANG, R.Z. WANG()
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
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Abstract

In this paper, the simulation approach and exergy analysis of multi-stage compression high temperature heat pump (HTHP) systems with R1234ze(Z) working fluid are conducted. Both the single-stage and multi-stage compression cycles are analyzed to compare the system performance with 120°C pressurized hot water supply based upon waste heat recovery. The exergy destruction ratios of each component for different stage compression systems are compared. The results show that the exergy loss ratios of the compressor are bigger than that of the evaporator and the condenser for the single-stage compression system. The multi-stage compression system has better energy and exergy efficiencies with the increase of compression stage number. Compared with the single-stage compression system, the coefficient of performance (COP) improvements of the two-stage and three-stage compression system are 9.1% and 14.6%, respectively. When the waste heat source temperature is 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      high temperature heat pump      heat recovery      exergy destruction      R1234ze(Z) working fluid     
Corresponding Author(s): R.Z. WANG   
Just Accepted Date: 30 October 2017   Online First Date: 14 November 2017    Issue Date: 14 December 2017
 Cite this article:   
Bin HU,Di WU,L.W. WANG, et al. Exergy analysis of R1234ze(Z) as high temperature heat pump working fluid with multi-stage compression[J]. Front. Energy, 2017, 11(4): 493-502.
 URL:  
https://academic.hep.com.cn/fie/EN/10.1007/s11708-017-0510-6
https://academic.hep.com.cn/fie/EN/Y2017/V11/I4/493
Fig.1  Description of two-stagecompression heat pump system
Fig.2  Description of three-stagecompression heat pump system
Refrigerants Molecular mass NBP/°C Tcrit/°C Pcrit/MPa Safety group GWP100
R134a 102.03 –26.1 101.1 4.06 A1 1430
R245fa 134.0 15.14 154.01 3.651 B2 950
R600a 58.12 –11.7 134.7 3.64 A3 20
R717 17.03 –33.3 132.3 11.34 B2 <1
R744 44.01 –78.4 31.1 7.38 A1 1
R1234yf 114.0 –28 103.25 3.92 A2L 4
R1234ze(E) 114.0 –19 119.45 3.64 A2L 6
R1234ze(Z) 114.0 9.8 150.1 3.53 A2L 2.2
Tab.1  Properties ofselected refrigerants for HTHP
Fig.3  Flowchart of multi-stagecompression heat pump modeling
Fig.4  Variation of total powerconsumption with waste heat source temperature
Fig.5  Variation of COP with wasteheat source temperature
Fig.6  Variation of exergy efficiencywith waste heat source temperature
Items Single-stage Two-stage three-stage
Wcom/kW 146.1 141.8 137.2
Qcon/kW 524.6 545.7 561.8
Qeva/kW 420 420 420
COP 3.59 3.93 4.18
mtotal/(kg·s−1) 2.96 3.11 3.25
min,1/(kg·s−1) 0.496 0.276
min,2/(kg·s−1) 0.322
Psuc/bar 3.91 3.91 3.91
Pin,1/bar 8.92 6.76
Pin,2/bar 11.72
Pdis/bar 20.29 20.29 20.29
Tab.2  Simulation resultsof R1234ze(Z) heat pumps
Fig.7  Exergy destruction ratioof compression processes
Fig.8  Exergy destruction ratioof condensation processes
Fig.9  Exergy destruction ratioof expansion processes
Fig.10  Exergy destruction ratioof evaporation processes
Fig.11  Comparison of simulationand reference results
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