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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

邮发代号 80-972

2019 Impact Factor: 2.657

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Frontiers in Energy  2017, Vol. 11 Issue (4): 493-502   https://doi.org/10.1007/s11708-017-0510-6
  本期目录
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
 全文: PDF(394 KB)   HTML
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.
Key words： multi-stage compression    high temperature heat pump    heat recovery    exergy destruction    R1234ze(Z) working fluid
收稿日期: 2017-07-05      出版日期: 2017-12-14
Corresponding Author(s): R.Z. WANG   
 引用本文:   
. [J]. Frontiers in Energy, 2017, 11(4): 493-502.
Bin HU, Di WU, L.W. WANG, R.Z. WANG. Exergy analysis of R1234ze(Z) as high temperature heat pump working fluid with multi-stage compression. Front. Energy, 2017, 11(4): 493-502.
 链接本文:  
https://academic.hep.com.cn/fie/CN/10.1007/s11708-017-0510-6
https://academic.hep.com.cn/fie/CN/Y2017/V11/I4/493
Fig.1  
Fig.2  
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  
Fig.3  
Fig.4  
Fig.5  
Fig.6  
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  
Fig.7  
Fig.8  
Fig.9  
Fig.10  
Fig.11  
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