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Performance optimization of a heat pump integrated with a single-screw refrigeration compressor with liquid refrigerant injection

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  • Wen, Qiangyu
  • Zhi, Ruiping
  • Wu, Yuting
  • Lei, Biao
  • Liu, Shanwei
  • Shen, Lili

Abstract

Refrigerant injection is a good method for reducing the exhaust temperature of a single-screw refrigeration compressor (SSRC). In this paper, an accurate method is proposed to calculate the variation of the injection area for different initial positions and different sizes of injection holes. Furthermore, a mathematical model describing the internal working process of an SSRC with liquid refrigerant injection (LRI) is established to evaluate the performance of an SSRC and heat pump with a variety of injection hole geometries and working conditions. This theoretical model is verified by comparing the calculation results with experimental data. The results show that LRI can markedly reduce the exhaust temperature and improve the performance of the SSRC and heat pump to some extent. The injection-hole radius is the most important factor affecting the performance of the compressor and heat-pump system. The variations of different performance parameters of the SSRC and heat pump at low ambient temperature can be obtained. This work provides a theoretical method for optimizing the injection process in SSRCs.

Suggested Citation

  • Wen, Qiangyu & Zhi, Ruiping & Wu, Yuting & Lei, Biao & Liu, Shanwei & Shen, Lili, 2020. "Performance optimization of a heat pump integrated with a single-screw refrigeration compressor with liquid refrigerant injection," Energy, Elsevier, vol. 207(C).
    • Handle: RePEc:eee:energy:v:207:y:2020:i:c:s0360544220313049
    DOI: 10.1016/j.energy.2020.118197
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    Cited by:

    1. Jian Sun & Yinwu Wang & Yu Qin & Guoshun Wang & Ran Liu & Yongping Yang, 2023. "A Review of Super-High-Temperature Heat Pumps over 100 °C," Energies, MDPI, vol. 16(12), pages 1-18, June.
    2. Li, Yanan & Zhi, Ruiping & Wu, Yuting & Wang, Jingfu & Lei, Biao & Shen, Lili, 2022. "Influence of clearance height on performance of water-lubricated single-screw air compressor," Energy, Elsevier, vol. 251(C).

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