Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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A Study on the Cooling and Heating Capacity Design Method of a Ground Heat Exchanger Installed in Jeju Island

제주도에 설치된 지중열교환기 용량 설계 방법 연구

  • Ji-Hwan Lim (Department of Mechanical Engineering, Graduate School, Korea University of Technology and Education/Korea Refrigeration and Air-conditioning Assessment Center) ;
  • Jeonghoon Lee (School of Mechanical Engineering, Korea University of Technology and Education) ;
  • Min-Jun Kim (Korea Refrigeration and Air-conditioning Assessment Center) ;
  • Ji-Souk Ryu (Daesung HeatEnersys)
  • 임지환 (한국기술교육대학교 대학원 기계공학과/한국냉동공조인증센터) ;
  • 이정훈 (한국기술교육대학교 기계공학부 ) ;
  • 김민준 (한국냉동공조인증센터 ) ;
  • 유지석 (대성히트에너시스(주))
  • Received : 2025.02.10
  • Accepted : 2025.02.26
  • Published : 2025.03.01
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Abstract

In this study, the thermal characteristics of ground heat exchangers (GHXs) installed on Jeju Island were investigated. A ground heat exchanger was installed in Sinchon-ri, Jocheon-eup, Jeju-si, and the heat capacity, mean circulating water temperature, and differential pressure changes were examined based on the input heat amount and circulating water flow rate. As a result of the analysis, the ground temperature of the ground heat exchanger was measured to be 16.3℃. The heat capacity was calculated to be 85.8 kW (cooling) and 60.8 kW (heating), while the design capacity of the heat pump unit was determined to be 69.6 kW (cooling) and 84.0 kW (heating). Regarding the characteristics according to changes in the circulating water flow rate, as the flow rate increased from 140 L/min to 260 L/min, the mean circulating water temperature decreased from 29.2℃ to 28.3℃, whereas the differential pressure of the ground heat exchanger increased from 50 kPa to 275 kPa. The differential pressure of the ground heat exchanger varied depending on the shape of the heat exchanger and the length of the circulating water line.

Keywords

Acknowledgement

본 연구는 산업통상자원부 재원으로 한국산업기술기획평가원(KEIT) (과제번호: RS-2024-00417355)과 한국기술교육대학교 교육연구진흥비의 지원을 받아 수행된 연구입니다.

References

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  3. Jeju special self-governing province ground water management ordinance, Jeju special self-governing province ground water management ordinance enforcement regulations, Appendix 5, 2017.
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