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Experimental Investigation of the Improvement Potential of a Heat Pump Equipped with a Two-Phase Ejector

Author

Listed:
  • Wichean Singmai

    (Advanced Refrigeration and Air Conditioning Laboratory (ARAC), Department of Teacher Training in Mechanical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
    Thermal and Fluid Laboratory (TFL), Department of Teacher Training in Mechanical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand)

  • Kasemsil Onthong

    (Advanced Refrigeration and Air Conditioning Laboratory (ARAC), Department of Teacher Training in Mechanical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
    Thermal and Fluid Laboratory (TFL), Department of Teacher Training in Mechanical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand)

  • Tongchana Thongtip

    (Advanced Refrigeration and Air Conditioning Laboratory (ARAC), Department of Teacher Training in Mechanical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
    Thermal and Fluid Laboratory (TFL), Department of Teacher Training in Mechanical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand)

Abstract

In this paper, an experimental investigation of the performance improvement of a heat pump equipped with a two-phase ejector, called an “ejector–expansion heat pump (EEHP)”, is proposed. The system performance of the EEHP is compared with that of a vapor-compression heat pump (VCHP). The improvement potential is determined and discussed. The heat pump test system based on a water-to-water heat pump that can experiment with both the EEHP and the VCHP is constructed. A two-phase ejector with a cooling load of up to 2500 W is installed for the experiment. The results show that the EEHP always produces a higher heating rate and COP HP than the VCHP under the specified working conditions. The heating COP HP is increased by 5.7–11.6% depending on the working conditions. It is also found that, under the same heat sink and heat source temperature, the EEHP can produce a lower compressor discharge temperature and a lower compressor pressure ratio than the VCHP. This is evidence that the two-phase ejector can provide the compressor with better working characteristics, which yields a longer compressor lifetime. It is demonstrated that the expansion pressure ratio is key to the performance of the EEHP. A larger expansion pressure ratio yields greater improvement potential when compared with the VCHP.

Suggested Citation

  • Wichean Singmai & Kasemsil Onthong & Tongchana Thongtip, 2023. "Experimental Investigation of the Improvement Potential of a Heat Pump Equipped with a Two-Phase Ejector," Energies, MDPI, vol. 16(16), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:16:p:5889-:d:1213653
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    References listed on IDEAS

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    1. Zhanfeng Huang & Tingxun Li, 2023. "Experimental Investigation of Gravity Effect on a Vapor Compression Heat Pump System," Energies, MDPI, vol. 16(11), pages 1-22, May.
    2. abbas, Sajid & Yuan, Yanping & Hassan, Atazaz & Zhou, Jinzhi & Zeng, Chao & Yu, Min & Emmanuel, Bisengimana, 2022. "Experimental and numerical investigation on a solar direct-expansion heat pump system employing PV/T & solar thermal collector as evaporator," Energy, Elsevier, vol. 254(PB).
    3. Jakub Szymiczek & Krzysztof Szczotka & Marian Banaś & Przemysław Jura, 2022. "Efficiency of a Compressor Heat Pump System in Different Cycle Designs: A Simulation Study for Low-Enthalpy Geothermal Resources," Energies, MDPI, vol. 15(15), pages 1-19, July.
    4. Shiravi, Amir hossein & Ghanbarpour, Morteza & Palm, Bjorn, 2023. "Experimental evaluation of the effect of mechanical subcooling on a hydrocarbon heat pump system," Energy, Elsevier, vol. 274(C).
    5. Youxin Zhou & Bin Peng & Bingguo Zhu, 2023. "Assessment of Optimal Operating Range and Case Verification of a Waste Heat Air-Source Heat Pump Water Heater Based on a Semiempirical Parametric Model," Energies, MDPI, vol. 16(5), pages 1-16, February.
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