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Estimation of the Required Number of Fan Coil Unit for Surplus Solar Energy Recovery of Greenhouse

온실의 잉여 태양에너지 회수용 FCU 소요대수 검토

  • Yun, Sung-Wook (Dept. of Agricultural Engineering, National Academy of Agricultural Science, RDA) ;
  • Choi, Man Kwon (Protected Horticulture Research Institute, NIHHS, RDA) ;
  • Kim, Ha Neul (Dept. of Agricultural Eng., Gyeongsang National Univ.(Institute of Agriculture and Life Science, GNU)) ;
  • Kang, Donghyeon (Dept. of Agricultural Engineering, National Academy of Agricultural Science, RDA) ;
  • Lee, Siyoung (Dept. of Agricultural Engineering, National Academy of Agricultural Science, RDA) ;
  • Son, Jinkwan (Dept. of Agricultural Engineering, National Academy of Agricultural Science, RDA) ;
  • Yoon, Yong Cheol (Dept. of Agricultural Eng., Gyeongsang National Univ.(Institute of Agriculture and Life Science, GNU))
  • 윤성욱 (농촌진흥청 농업공학부 에너지환경공학과) ;
  • 최만권 (국립원예 특작 과학원 시설원예 연구소) ;
  • 김하늘 (경상대학교 지역환경기반공학과(농업생명과학연구원)) ;
  • 강동현 (농촌진흥청 농업공학부 에너지환경공학과) ;
  • 이시영 (농촌진흥청 농업공학부 에너지환경공학과) ;
  • 손진관 (농촌진흥청 농업공학부 에너지환경공학과) ;
  • 윤용철 (경상대학교 지역환경기반공학과(농업생명과학연구원))
  • Received : 2016.02.22
  • Accepted : 2016.04.04
  • Published : 2016.06.30

Abstract

In this study, previously reported surplus solar energy-related study result and current status of fan coil unit (FCU) for cooling and heating installed in the current sites were briefly examined and then a method to determine the number of FCUs required to recover surplus solar energy was schematically proposed to provide basic data for researchers and technical engineers in this field. The maximum, mean, and minimum outside temperatures during the experiment period were about $28.2^{\circ}C$, $4.4^{\circ}C$, and $-11.5^{\circ}C$, respectively. The horizontal surface solar radiation level outside the greenhouse was in a range of $0.8-20.5MJ{\cdot}m^{-2}$ and mean and total solar radiation were $10.8MJ{\cdot}m^{-2}$ and $1,187.5MJ{\cdot}m^{-2}$. The mean temperature and relative humidity in the greenhouse during the daytime were in a range of 18.8-45.5 and 53.5-77.5%. The total surplus solar energy recovered from the greenhouse during the experiment period was approximately 6,613.4MJ, which could supplement about 6.7% of the total heating energy 98,600.2 MJ. In addition, the number of FCUs installed for heating varies case to case, although similar FCUs are used. Thus, it is necessary to study the installation height, orientation and installation distance as well as the appropriate number of FCUs from the efficient and economical viewpoints. The required numbers of FCUs for surplus solar energy recovery were 8.4-10.9units and 6.1-8.0units based on air mass and circular flow rate that passed through the FCUs. Considering calculation methods and the risks such as efficiency and use environments of FCUs, it was found that about nine units (one unit per $24m^3$ approximately) needed to be installed. The required number of FCUs for surplus solar energy recovery was around one unit per $24m^3$ approximately.

본 연구에서는 이미 보고된 잉여 태양에너지 관련 연구결과와 현재 현장에 설치되어 있는 냉난방용 FCU 현황을 개략적으로 검토한 후, 잉여 태양에너지 회수에 필요한 FCU의 소요대수 결정 방법을 개략적으로 제시하여 앞으로 이 분야의 연구자 및 기술자들에게 기조자료를 제시할 목적으로 연구를 수행하였다. 실험기간 동안 최대, 평균 및 최저 외기온은 각각 $28.2^{\circ}C$, $4.4^{\circ}C$$-11.5^{\circ}C$정도였다. 온실 밖의 수평면 일사량은 $0.8{\sim}20.5MJ{\cdot}m^{-2}$로 정도의 범위였으며, 평균 및 총 일사량은 $10.8MJ{\cdot}m^{-2}$$1,187.5MJ{\cdot}m^{-2}$으로 나타났다. 그리고 주간동안 온실 내의 평균기온과 상대습도는 각각 18.8~45.5 및 53.5~77.5%정도였다. 실험기간 동안 온실로부터 회수한 총 잉여 태양에너지는 6,613.4MJ정도로서 총 난방에너지인 98,600.2MJ 약 6.7%정도를 보충할 수 있을 것으로 나타났다. 또한 사양이 유사한 FCU를 사용하지만, 난방을 위하여 설치되는 FCU의 대수는 제각각 다른 것을 알 수 있었고, 좀 더 효율적이고 경제적인 관점에서 설치높이, 방향 및 설치간격, 적정 대수에 대한 연구가 이루어져야 할 것으로 판단된다. 잉여 태양에너지 회수용 FCU의 적정 소요 대수는 FCU를 통과하는 공기의 질량 및 순환유량을 기준으로 각각 8.4~10.9대 및 6.1~8.0대 정도이었다. 여기에 계산방법이나 FCU의 효율 및 사용 환경 등 위험률을 고려하면, 결국 9대 전후(약 $24m^3$당 1대 정도)를 설치하면 될 것으로 판단되었다.

Keywords

References

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