Journal of Thermal Analysis and Calorimetry

, Volume 133, Issue 3, pp 1579–1588 | Cite as

Experimental investigation of the heating performance of refrigerant injection heat pump with a single-cylinder inverter-driven rotary compressor

  • Jinfei Sun
  • Dongsheng Zhu
  • Yingde Yin
  • Xiuzhen Li


Applying the refrigerant injection technology to air-source heat pump had been proved to be an effective access to acquire a better performance in the cold regions. In this paper, the test-bed of R410A single-cylinder rotary compressor vapor injection (SCRCVI) system with flash tank was built and measured by changing the compressor frequency f and injection pressure Pinj under various ambient temperatures. The experimental results indicated that the effect of refrigerant injection became stronger as the ambient temperature decreased. So the SCRCVI showed a superior heating performance at lower ambient temperature, and the conventional single-stage vapor compression (CSVC) system would exhibit higher COPh, while the ambient temperature was beyond the critical value. Compared with the CSVC system, the Qh and COPh were improved by 9.1 ~ 29.5 and 5.35 ~ 7.89%, respectively, under the ambient temperature Tod = − 10 °C. The injection pressure ratio Rp under different operating conditions was varied in the range between 0.2 and 0.22. Specifically, the trend in variation of Rp was reliably used to optimize the refrigerant injection system design and the control strategy.


Rotary compressor Refrigerant injection Flash tank Heat pump Heating performance Variable speed 



Coefficient of performance


Conventional single-stage vapor compression


Electronic expansion valve


Flash tank vapor injection


Single-cylinder rotary compressor vapor injection


Sub-cooler vapor injection


Twin-cylinder rotary compressor vapor injection

List of symbols


Compressor frequency


Specific enthalpy (J kg−1)

\(\dot m\)

Mass flow rate (kg s−1)


Pressure (kPa)


Capacity (W)


Injection mass flow ratio


Injection pressure ratio


Temperature (K)


Power consumption (W)



Air side




Dry bulb temperature








Air inlet






Air outlet






Wet bulb temperature


Working chamber



This research was supported by the South Wisdom Valley Innovative Research Team Program (Serial Number: Shunde District of Foshan City Government Office [2014] No. 365) and the 2017 Guangzhou Collaborative Innovation Major Projects (Nos. 201604016048 and 201604016069).


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Jinfei Sun
    • 1
    • 2
    • 3
    • 4
  • Dongsheng Zhu
    • 1
    • 2
    • 3
  • Yingde Yin
    • 1
    • 2
    • 3
  • Xiuzhen Li
    • 1
    • 2
    • 3
    • 4
  1. 1.Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhouChina
  2. 2.Key Laboratory of Renewable EnergyChinese Academy of SciencesGuangzhouChina
  3. 3.Guangdong Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhouChina
  4. 4.University of Chinese Academy of SciencesBeijingChina

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