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Author:

Xiao Biao (Xiao Biao.) | Huang Tongyi (Huang Tongyi.) | He Lin (He Lin.) | Yan Yan (Yan Yan.) | Sun Yuying (Sun Yuying.) | Wang Wei (Wang Wei.) (Scholars:王伟)

Indexed by:

EI Scopus SCIE

Abstract:

Traditional air source heat pumps (ASHPs) only can work above about -20 degrees C to -25 degrees C, and have limitations in terms of performance. This paper proposes a novel three-cylinder two-stage variable volume ratio (TSVVR) rotary compressor to improve the performance of the ASHP. Utilizing the variation characteristics of the compressor optimal volume ratio under the different temperatures, the compressor volume can be switched for better performance. Experiments are conducted on the improved ASHP with the TSVVR rotary compressor and the two traditional ASHPs with the single-stage and two-stage compressor using the simulation of the residential building in the environmental laboratory. The results show that the TSVVR system operates in a stable manner with the COP of 1.52 W/W at -30 degrees C, and achieves a higher COP than the traditional ASHPs. The optimal volume ratio decreases with the decrease of the evaporation temperature. The TSVVR system works in the three-cylinder mode at low temperature and directly expands the heating capacity and compression efficiency because of the increase of the low-pressure volume and suction volume. When the water temperature varies between 40 degrees C and the maximum possible temperature, the COP of the TSVVR system is 18.4-22.3% higher and 6.6-7.3% higher than the single-stage and two-stage systems, respectively; when the indoor temperature varies between 12.5 degrees C and 18 degrees C, the COP of the TSVVR system is around 18.4-23.4% and 5.2-8.8% higher than the single-stage and two-stage systems, respectively. The two-cylinder mode of the TSVVR system has a larger volume ratio than the single-stage and two-stage ASHPs and is closer to the optimal volume ratio, which is more suitable for the high temperature and low load conditions. In the three-cylinder mode, the TSVVR system has a smaller volume ratio, and the compression efficiency and system refrigerant flow rate increase, when the evaporation temperature is low. Two modes ensure that the TSVVR system always work in the efficient states, especially in the low temperature environments. (C) 2018 Elsevier Ltd and IIR. All rights reserved.

Keyword:

Compressor Two-stage compression Variable volume ratio Air source heat pump Three cylinders

Author Community:

  • [ 1 ] [Xiao Biao]GREE Elect Appliances Inc, SKL Air Conditioning Equipment & Syst Energy Cons, Zhuhai 519070, Peoples R China
  • [ 2 ] [Huang Tongyi]GREE Elect Appliances Inc, SKL Air Conditioning Equipment & Syst Energy Cons, Zhuhai 519070, Peoples R China
  • [ 3 ] [He Lin]GREE Elect Appliances Inc, SKL Air Conditioning Equipment & Syst Energy Cons, Zhuhai 519070, Peoples R China
  • [ 4 ] [Yan Yan]GREE Elect Appliances Inc, SKL Air Conditioning Equipment & Syst Energy Cons, Zhuhai 519070, Peoples R China
  • [ 5 ] [Sun Yuying]Beijing Univ Technol, Coll Architecture & Civil Engn, Dept Bldg Environm Facil Engn, 100 Pingleyuan Rd, Beijing 100124, Peoples R China
  • [ 6 ] [Wang Wei]Beijing Univ Technol, Coll Architecture & Civil Engn, Dept Bldg Environm Facil Engn, 100 Pingleyuan Rd, Beijing 100124, Peoples R China
  • [ 7 ] [Sun Yuying]Beijing Key Lab Green Built Environm & Energy Eff, 100 Pingleyuan Rd, Beijing 100124, Peoples R China
  • [ 8 ] [Wang Wei]Beijing Key Lab Green Built Environm & Energy Eff, 100 Pingleyuan Rd, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Xiao Biao]GREE Elect Appliances Inc, SKL Air Conditioning Equipment & Syst Energy Cons, Zhuhai 519070, Peoples R China;;[He Lin]GREE Elect Appliances Inc, SKL Air Conditioning Equipment & Syst Energy Cons, Zhuhai 519070, Peoples R China

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Source :

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID

ISSN: 0140-7007

Year: 2019

Volume: 100

Page: 343-353

3 . 9 0 0

JCR@2022

ESI Discipline: ENGINEERING;

ESI HC Threshold:136

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count: 28

SCOPUS Cited Count: 28

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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