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2021 Vol.41, Issue 6 Preview Page

Research Article

Long-Term Thermal Performance Evaluation of a Solar Heating System of Greenhouse with High Temperature Underground Seasonal Thermal Energy Storage

고온 지중 계간축열시스템을 갖는 온실의 태양열 난방시스템 장기 열성능평가

Hee-Won Lim1
,
Hyun-Seung Lee2
,
Wang-Je Lee3
,
U-Cheul Shin4*
임 희원1
,
이 현승2
,
이 왕제3
,
신 우철4*
1Ph.D.Candidate, Department of Architectural Engineering, Graduate School, Daejeon University
2Researcher, Korea Institute of Sustainable Design and Educational Environment
3Engineer, Renewable Heat Integration Laboratory, Korea Institute of Energy Research
4Professor, Department of Architectural Engineering, Daejeon University
1대전대학교 대학원 건축공학과, 박사과정
2한국교육녹색환경연구원, 연구원
3한국에너지기술연구원 신재생열융합연구실, 기술원
4대전대학교 건축공학과, 교수
*Corresponding Author
30 December 2021. pp. 59-72
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Abstract

In this study, we analyzed the long-term feasibility of a solar heating system for a citrus greenhouse to address the financial difficulties facing farms and to reduce greenhouse gas emissions. The solar heating system consisted of an auxiliary boiler, a solar storage tank with a capacity of 100 m3 and a cylindrical borehole thermal energy system (BTES) with a storage volume of 2,905 m3. We installed an evacuated tube collector and flat-plate collector (both with a capacity of 302 m2) to measure and compare each solar fraction and thermal storage efficiency. TRNSYS 18 was used as the simulation tool. The annual solar fraction was found to be 83.2%, and the efficiency of thermal storage was 35.7%. In this case, the efficiency of evacuated tube collector and flat-plate collector was 68.7% and 33.2% respectively. This shows that the evacuated tube collector, operating at a relatively high temperature, was more efficient than the flat-plate collector. Despite the high solar fraction, the maximum operating temperature of the solar storage tank was 90° or less, indicating that the tank was less likely to fail due to overheating.

Keywords
Citrus
Borehole thermal energy storage
Greenhouse
Soar heating system
Solar fraction
키워드
만감류
보어홀 열저장
온실
태양열시스템
태양의존율
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Information
  • Publisher :Korean Solar Energy Society
  • Publisher(Ko) :한국태양에너지학회
  • Journal Title :Journal of the Korean Solar Energy Society
  • Journal Title(Ko) :한국태양에너지학회 논문집
  • Volume : 41
  • No :6
  • Pages :59-72
  • Received Date : 2021-08-27
  • Revised Date : 2021-10-18
  • Accepted Date : 2021-11-09
  • DOI :https://doi.org/10.7836/kses.2021.41.6.059
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