New & Renewable Energy (신재생에너지)

Korean Society for New and Renewable Energy (한국신·재생에너지학회)
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Study on the Performance Evaluation of Smart Heating and Cooling Heat Pump System in a Balancing Well Cross-Conditioned Ground Heat Exchanger

Balancing Well 교차혼합 지중열교환기의 스마트 냉난방 히트펌프 시스템의 성능평가에 관한 연구

  • Lee, Changhee (Department of Mechanical and Shipbuilding Convergence Engineering, Pukyong National University) ;
  • Kim, Donggyu (Department of Mechanical and Shipbuilding Convergence Engineering, Pukyong National University) ;
  • Yu, Byeoungseok (Department of Mechanical and Shipbuilding Convergence Engineering, Pukyong National University) ;
  • Kim, Booil (Department of Electrical, Electronics and Software Engineering, Pukyong National University)
  • Received : 2020.07.22
  • Accepted : 2020.10.28
  • Published : 2020.12.25
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Abstract

This study performed a single hole operation method using a balancing well-cross-mixed underground heat exchanger, and conducted thermal performance studies of an SCW-type underground heat exchanger using a two-well. The study attempted to change the existing operating method of the two adjacent SCW underground heat exchangers with one ball each. The SCW-type geothermal heat exchanger is considered to enable up to 20% of bleed discharge at maximum load, which makes groundwater usage unequal. The efficiency factor of the geothermal system was improved by constructing the discharged water by cross-mixing two balancing wells to prevent the discharge of groundwater sources and keep the temperature of the underground heat exchanger constant. As a result of the cooling and heating operation with the existing SCW heat exchange system and the balancing well-cross-mixed heat exchange system, the measured performance coefficient improved by 23% and 12% in cooling and heating operations, respectively. In addition, when operating with a balanced cross-mixing heat exchange system, it has been confirmed that the initial basement temperature is constant with a standard deviation of 0.08 to 0.12℃.

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References

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  1. Development of a Groundwater Source Heat Pump in a Fractured Rock Aquifer vol.17, pp.3, 2020, https://doi.org/10.7849/ksnre.2021.0013