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<p>In this study, a 100-h experimental analysis was conducted on a 3RT small-scale direct-expansion (DX) ground-source heat pump for space cooling and heating installed as a demonstration in Korea. The ground heat exchanger system includes six 30-m-deep boreholes arranged as a hexagon with a uniform spacing of 5 m. The appropriate refrigerant charge amount was decided as 6 kg by observing the increase in heat capacity and coefficient of performance (COP) with different charge amounts. In the cooling mode, the capacity gradually decreased from a maximum of 8.74 to 7.62 kW throughout the experiment. Observation of both load-side and ground heat exchanger-side temperatures revealed that the transient behavior arose not from the load side but from the ground side. In the heating mode, the initial heating capacity increased up to 8.43 kW and gradually decreased to 7.45 kW. After startup and the change of underground temperature, the system reached a steady state in 10 h in both heating and cooling modes, where the size of the heat reservoirs was found to be important in determining the transient behavior and attainment of steady state. Finally, a comparison on the seasonal performance factor of the DX ground-source heat pump between model-based simulation and data-based experiment showed that the values of the performance factor were different.</p>

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Experimental performance analysis of 3RT small-scale direct-expansion ground-source heat pump for space heating and cooling

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Soyeon Kim,
  • Minkyu Jung,
  • Donik Ku,
  • Sun-Ik Na,
  • Gilbong Lee,
  • Minsung Kim

摘要

In this study, a 100-h experimental analysis was conducted on a 3RT small-scale direct-expansion (DX) ground-source heat pump for space cooling and heating installed as a demonstration in Korea. The ground heat exchanger system includes six 30-m-deep boreholes arranged as a hexagon with a uniform spacing of 5 m. The appropriate refrigerant charge amount was decided as 6 kg by observing the increase in heat capacity and coefficient of performance (COP) with different charge amounts. In the cooling mode, the capacity gradually decreased from a maximum of 8.74 to 7.62 kW throughout the experiment. Observation of both load-side and ground heat exchanger-side temperatures revealed that the transient behavior arose not from the load side but from the ground side. In the heating mode, the initial heating capacity increased up to 8.43 kW and gradually decreased to 7.45 kW. After startup and the change of underground temperature, the system reached a steady state in 10 h in both heating and cooling modes, where the size of the heat reservoirs was found to be important in determining the transient behavior and attainment of steady state. Finally, a comparison on the seasonal performance factor of the DX ground-source heat pump between model-based simulation and data-based experiment showed that the values of the performance factor were different.