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Cooling Performance Enhancement of a 20 RT (70 kW) Two-Evaporator Heat Pump with a Vapor–Liquid Separator

Author

Listed:
  • Won-Suk Yang

    (Department of Architectural Engineering, Graduate School, Seoul National University of Science and Technology, Seoul 01811, Korea)

  • Young Il Kim

    (School of Architecture, Seoul National University of Science and Technology, Seoul 01811, Korea)

Abstract

20 RT (70 kW) two-evaporator heat pump system was developed, manufactured, and tested to enhance the cooling performance using a vapor–liquid separator. In the proposed system, two evaporators are connected in series, and the refrigerant passing through the primary evaporator is separated into vapor and liquid using a vapor–liquid separator. The vapor refrigerant is passed to the compressor, whereas the liquid phase flows into the second evaporator. The amount of vapor refrigerant sent to the compressor can be adjusted through a needle valve opening (0%, 50%, and 100%). The influence of this parameter on the cooling performance was analyzed. The cooling performance tests were repeated five times to check repeatability. Data associated with the air and refrigerant sides were obtained, and the average coefficients of performance (COPs) were calculated. The average COP associated with the air side was approximately 5% lower than that pertaining to the refrigerant side owing to the heat loss. In terms of the air-side cooling performance, the average COP was 3.14, 3.40, and 3.68 when the valve openings were 0%, 50%, and 100%, respectively. The cooling performance when the valve opening was 100% was 17.2% higher than that for the valve opening of 0%. The findings demonstrated that the cooling performance of a heat pump can be enhanced using two evaporators and a vapor–liquid separator.

Suggested Citation

  • Won-Suk Yang & Young Il Kim, 2022. "Cooling Performance Enhancement of a 20 RT (70 kW) Two-Evaporator Heat Pump with a Vapor–Liquid Separator," Energies, MDPI, vol. 15(11), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:11:p:3849-:d:822436
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    References listed on IDEAS

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    1. Çakır, Uğur & Çomaklı, Kemal & Çomaklı, Ömer & Karslı, Süleyman, 2013. "An experimental exergetic comparison of four different heat pump systems working at same conditions: As air to air, air to water, water to water and water to air," Energy, Elsevier, vol. 58(C), pages 210-219.
    2. Safa, Amir A. & Fung, Alan S. & Kumar, Rakesh, 2015. "Heating and cooling performance characterisation of ground source heat pump system by testing and TRNSYS simulation," Renewable Energy, Elsevier, vol. 83(C), pages 565-575.
    3. Hakkaki-Fard, Ali & Eslami-Nejad, Parham & Aidoun, Zine & Ouzzane, Mohamed, 2015. "A techno-economic comparison of a direct expansion ground-source and an air-source heat pump system in Canadian cold climates," Energy, Elsevier, vol. 87(C), pages 49-59.
    4. Yang, Liu & Yan, Haiyan & Lam, Joseph C., 2014. "Thermal comfort and building energy consumption implications – A review," Applied Energy, Elsevier, vol. 115(C), pages 164-173.
    5. Chua, K.J. & Chou, S.K. & Yang, W.M., 2010. "Advances in heat pump systems: A review," Applied Energy, Elsevier, vol. 87(12), pages 3611-3624, December.
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