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Experimental Investigation on a Vapor Injection Heat Pump System with a Single-Stage Compressor

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  • Hongzhi Liu

    (Department of Building Environment and Energy Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China
    Environmental System Research Laboratory, Hokkaido University, N13-W8, Sapporo 060-8628, Japan)

  • Katsunori Nagano

    (Environmental System Research Laboratory, Hokkaido University, N13-W8, Sapporo 060-8628, Japan)

  • Takao Katsura

    (Environmental System Research Laboratory, Hokkaido University, N13-W8, Sapporo 060-8628, Japan)

  • Yue Han

    (Environmental System Research Laboratory, Hokkaido University, N13-W8, Sapporo 060-8628, Japan)

Abstract

In this study, a heat pump of 10 kW with vapor injection using refrigerant of R410A was developed. A vapor injection pipe connecting a gas–liquid separator at the outlet of the main expansion valve and the suction of a single-stage rotary compressor was designed. The heating performance of this vapor injection heat pump was investigated and analyzed at different compressor frequencies and primary temperatures. The experimental results show that for the heat pump without vapor injection, the heating capacity increased linearly with the compressor frequency, while the heating coefficient of performance (COP) decreased linearly with the compressor frequency for each tested primary temperature. The developed vapor injection technique is able to increase the heat pump system’s heating capacity and heating COP when the injection ratio R falls into the range 0.16–0.17. The refrigerant mass flow rate can be increased in the vapor injection heat pump cycle due to the decreased specific volume of the suction refrigerant. The power consumption of vapor injection heat pump cycle almost remains the same with that of the conventional heat pump cycle because of the increased refrigerant mass flow rate and the decreased compression ratio. Finally, it was found that the developed vapor injection cycle is preferable to decreasing the compressor’s discharge temperature.

Suggested Citation

  • Hongzhi Liu & Katsunori Nagano & Takao Katsura & Yue Han, 2020. "Experimental Investigation on a Vapor Injection Heat Pump System with a Single-Stage Compressor," Energies, MDPI, vol. 13(12), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3133-:d:372572
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    References listed on IDEAS

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    1. Mustafa Omer, Abdeen, 2008. "Ground-source heat pumps systems and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(2), pages 344-371, February.
    2. Blanco, David L. & Nagano, Katsunori & Morimoto, Masahiro, 2013. "Impact of control schemes of a monovalent inverter-driven water-to-water heat pump with a desuperheater in continental and subtropical climates through simulation," Applied Energy, Elsevier, vol. 109(C), pages 374-386.
    3. Cho, Il Yong & Seo, HyeongJoon & Kim, Dongwoo & Kim, Yongchan, 2016. "Performance comparison between R410A and R32 multi-heat pumps with a sub-cooler vapor injection in the heating and cooling modes," Energy, Elsevier, vol. 112(C), pages 179-187.
    4. Ma, Guo-yuan & Chai, Qin-hu, 2004. "Characteristics of an improved heat-pump cycle for cold regions," Applied Energy, Elsevier, vol. 77(3), pages 235-247, March.
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    Cited by:

    1. Win Jet Luo & Kun Ying Li & Jeng Min Huang & Chong Kai Yu, 2020. "Water Heating and Operational Mode Switching Effects on the Performance of a Multifunctional Heat Pump," Energies, MDPI, vol. 13(18), pages 1-25, September.
    2. Konrad, Mary Elizabeth & MacDonald, Brendan D., 2023. "Cold climate air source heat pumps: Industry progress and thermodynamic analysis of market-available residential units," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).

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