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Experimental Investigation of Gravity Effect on a Vapor Compression Heat Pump System

Author

Listed:
  • Zhanfeng Huang

    (School of Intelligent Systems Engineering, Sun Yat-sen University, West Xingang Road 135, Guangzhou 510275, China)

  • Tingxun Li

    (School of Intelligent Systems Engineering, Sun Yat-sen University, West Xingang Road 135, Guangzhou 510275, China)

Abstract

Vapor compression heat pumps have the potential to meet the future development requirements of thermal management in aerospace due to the ability to achieve high heat flux dissipation, precise temperature control, and a more compact and lightweight structure. In this study, a variable-angle test stand was constructed to investigate the effect of gravity on the performance, temperature distribution, and oil circulation rate of a vapor compression heat pump system in a ground environment. The results showed that the system could operate stably at various inclination angles, with the compressor exhibiting the lowest power consumption at an inclination angle of 90° and the maximum coefficient of performance (COP) of the vapor compression heat pump reaching 5.5. The system flow rate exhibited a sinusoidal curve with a 10.7% variation relative to the initial flow rate as the inclination angle increased. The evaporating temperature, condensing temperature, and compressor discharge temperature of the system were approximately symmetrical relative to the inclination angle of 180°. At inclination angles ranging from 90 to 270°, the oil circulation rate was highly sensitive to gravity changes and remained at a high level. The oil circulation rate agreed well with the change in subcooling/superheating, yet a rise in the oil circulation rate resulted in a decrease in COP.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:11:p:4412-:d:1159520
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    References listed on IDEAS

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    1. Tauseef Aized & Muhammad Rashid & Fahid Riaz & Ameer Hamza & Hafiz Zahid Nabi & Muhammad Sultan & Waqar Muhammad Ashraf & Jaroslaw Krzywanski, 2022. "Energy and Exergy Analysis of Vapor Compression Refrigeration System with Low-GWP Refrigerants," Energies, MDPI, vol. 15(19), pages 1-22, October.
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    Cited by:

    1. 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.

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