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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Study on Performance Level Analysis of Certified Geothermal Heat Pump Units According to Operating Conditions

운전조건에 따른 인증 지열 히트펌프 유닛 성능 수준 분석에 관한 연구

  • Chang Woo Yang (Graduate School of Mechanical Engineering, Hanbat National University) ;
  • Jong Min Choi (Department of Mechanical Engineering, Hanbat National University)
  • 양찬우 (국립한밭대학교 대학원 기계공학과) ;
  • 최종민 (국립한밭대학교 기계공학과)
  • Received : 2024.11.10
  • Accepted : 2024.11.15
  • Published : 2024.12.01
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Abstract

This study analyzed in detail the performance of geothermal heat pump units certified by the Korea Energy Agency. A total of 108 geothermal heat pump units were certified. The average COPs at the ground loop condition in the cooling and heating modes represented higher value by 19.2% and 5.7% than the certified criteria in each mode, respectively. Under the ground water loop condition, the average COP for cooling and heating mode was 30.1% and 11.4% higher than the certification standard, respectively. Although research on heat pump cycle technology and performance improvement is continuously being conducted, the COP performance of certified heat pump products did not show a trend of improvement. Therefore, it is recommended to imporved certification criteria in the cooling mode to develop and expand the distribution of more efficient heat pump unit products. All heat pump units with the highest ranking in the heating mode showed a greater decrease in the performance rankin in the cooling mode. In particular, the decrease in the performance ranking was greater in the ground water loop conditions than in the ground loop conditions. In order for geothermal heat pump unit to be operated in the excellent performance through the year, performance according to the change in ground temperature must be secured. It is urgent to improve the performance evaluation standards for geothermal heat pump units by developing and applying an annual performance index that consider the tempeature change and operation mode throughout the year.

Keywords

Acknowledgement

이 논문은 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구입니다(No. 2022R1A2C2006469)

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