Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Analysis of Air Temperature and Humidity Distributions and Energy Consumptions according to Use of Air Circulation Fans in a Single-span Greenhouse

단동온실 내 공기순환팬 사용에 따른 온습도 및 에너지소비량 비교 분석

  • Lee, Tae Seok (Division of Energy & Environmental Engineering, NIAS, RDA) ;
  • Kang, Geum Choon (Division of Energy & Environmental Engineering, NIAS, RDA) ;
  • Kim, Hyung Kweon (Division of Energy & Environmental Engineering, NIAS, RDA) ;
  • Moon, Jong Pil (Division of Energy & Environmental Engineering, NIAS, RDA) ;
  • Oh, Sung Sik (Division of Energy & Environmental Engineering, NIAS, RDA) ;
  • Kwon, Jin Kyung (Protected Horticulture Research Institute, NIHHS, RDA)
  • 이태석 (농촌진흥청 국립농업과학원 농업공학부 에너지환경공학과) ;
  • 강금춘 (농촌진흥청 국립농업과학원 농업공학부 에너지환경공학과) ;
  • 김형권 (농촌진흥청 국립농업과학원 농업공학부 에너지환경공학과) ;
  • 문종필 (농촌진흥청 국립농업과학원 농업공학부 에너지환경공학과) ;
  • 오성식 (농촌진흥청 국립농업과학원 농업공학부 에너지환경공학과) ;
  • 권진경 (농촌진흥청 국립원예특작과학원 시설원예연구소)
  • Received : 2017.09.05
  • Accepted : 2017.09.28
  • Published : 2017.10.31
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Abstract

The aim of this study was to compare and analyze air temperature and humidity distribution and energy consumptions according to using air circulation fans in single-span greenhouses. The greenhouses located in Cheongnam-myeon, Cheongyang-gun, Chungcheongnam-do, Korea. There were cherry tomatoes in the greenhouses and the size of greenhouses was as follows;ridge height : 3.2 m, wide : 6 m, length : 95 m. The heating system was composed of a hot-water boiler and 6 FCUs(Fan Coil Unit)-4 FCUs were on bottom with duct and 2 FCUs were installed at 2.0 m. A total of 18 air circulation fans(impeller's diameter : 230 mm) were bilaterally arranged in 2 rows in the experimental greenhouse. The sensors for measuring air temperature and humidity were located at a quarter and three quarters of a length. The height of sensors were 0.8 m, 1.8 m. To calculate energy consumption in greenhouses, water temperature at inlet and outlet in a water pump, volume of water were measured. Form February 3rd to March 23th, temperature, humidity and energy consumptions were measured during heating time(6pm~7am). In a greenhouse without fans, the average differences of temperature and humidity were $0.75^{\circ}C$, 2.31%, respectively. The operation of fans showed their differences to $0.42^{\circ}C$, 1.8%. The standard deviation of temperature and humidity between measuring points in the greenhouse with fans was lower than the greenhouse without fans. Total energy consumptions in a greenhouse without fans were 4,673 kWh. In the greenhouse with fans, the total energy consumptions were 4,009 kWh. The energy consumptions in a greenhouse with fans 14.2% were less than the greenhouse without fans. Therefore, air circulation makes temperature and humidity uniform and saves energy consumptions for heating.

본 연구는 방울토마토 재배 단동온실에 공기순환팬을 설치하고 공기순환팬이 온실 내 온도 및 습도 분포, 에너지소비량에 미치는 영향을 분석하였다. 공기순환팬은 날개 크기 230mm의 Stainless 팬으로, Lee 등(2016)의 연구결과를 참고하여 시험구 온실에 9m 간격으로 총 18대를 설치하였다. 온실 내부 온습도는 온실 길이방향으로 4등분하여 1/4 지점과 3/4 지점의 중앙에 센서를 설치하고 0.8m, 1.8m 높이 2곳의 온습도를 난방을 주로 하는 야간(오후 6시~다음 날 오전 7시)에 5분 간격으로 측정하였다. 에너지소비량은 각 온실에 위치한 온수펌프의 유량, 온수 출수부와 환수부의 온도차를 측정하여 계산하였다. 공기순환팬을 사용하지 않았을 때 측점 간 온도차 및 습도차의 평균값은 $0.75^{\circ}C$, 2.19%였으며 공기순환팬 사용 시 측점 간 온도차 및 습도차의 평균값은 $0.42^{\circ}C$, 1.27%로 감소하였다. 공기순환팬 설치 온실과 미설치 온실의 누적 에너지소비량은 각각 4,673kWh, 4,009kWh로 공기순환팬 설치 온실에서 약 14.2%의 에너지를 적게 소모하였다. 이러한 결과로 보아 온실 내 공기순환팬 사용은 공기를 지속적으로 교반시켜 주어 온실 전체의 온도 및 습도를 균일하게 만들고, 공기의 온도가 빠르게 변하지 않도록 해주어 난방 장치의 가동 시간과 에너지소비량을 줄일 수 있다.

Keywords

References

  1. Baba, M. 2010. Air circulator. Nogyo Gijutsu Taikei(Survey of agricultural technology. environment control, flower) 3:546-549 (in Japanese).
  2. Bakker, J.C. 1990. Effects of day and night humidity on yield and fruit quality of glasshouse tomatoes. J. Hort. Sci. 65(3):323-331.
  3. Fernandez, J.E. and B.J. Bailey. 1994. The influence of fans on environmental conditions in greenhousees. J. Agric. Engng. Res. 58:201-210. https://doi.org/10.1006/jaer.1994.1049
  4. Ishii, M., L. Okushima, H. Moriyama, Y. Furihata. 2012. Influence of circulation fans on the distribution of air temperature and air velocity in a greenhouse. J. SHITA 24:193-200. https://doi.org/10.2525/shita.24.193
  5. Jee, H.J., K.Y. Ryu, J.H. Park, D.H. Choi, G.H. Ryu, J.G. Ryu and S.S. Shen. 2008. Effect of COY(Cooking Oil and Yolk mixture) and ACF(Air-circulation Fan) on control of powdery mildew and production of organic lettuce. Res. Plant Dis. 14(1):51-56. https://doi.org/10.5423/RPD.2008.14.1.051
  6. Koths, B.J. and J.W. Bartok. 1985. The greenhouse Environment. John Wiley & Sons. INC.
  7. Kuroyanagi, T. 2016. Current usage of air circulation in greenhouses in Japan. Japan agricultural research quarterly. 50(1):7-12. https://doi.org/10.6090/jarq.50.7
  8. Lee, T.S, G.C. Kang, Y. Paek, J.P. Moon, S.S. Oh and J.K. Kwon. 2016. Analysis of temperature and humidity distributions according to arrangements of air circulation fans in single-span tomato greenhouse. Protected Hort. Plant Fac. 25(4):277-282. https://doi.org/10.12791/KSBEC.2016.25.4.277
  9. Matsuura, S., S. Hoshino, T. Kawaguchi. 2004, Effect of horizontal air flow by circulation fan on the disease incidence, growth and yield of tomato forcing culture in vinyl-house. Hiroshima Kenritsu Nougyou Gijutsu Center Kenkyu Houkoku( Bulletin of the Hiroshima Prefectural Agriculture Research Center), 76:11-17.
  10. Ministry of Agricultural Food and Rural Affairs(MAFRA). 2016. 2015 Vetgetable Greenhouse Status and Vegetable Production. Sejong, Korea.
  11. Nam S.W. and Y.S. Kim. 2009. Analysis on the uniformity of temperature and humidity according to environment control in tomato greenhouses. J. Bio-Env. Con. 18(3):215-224.
  12. Yu, I.H., M.W Cho, S.Y. Lee, H. Chun, and I.B. Lee. 2007. Effects of circulation fans on uniformity of meteorological factors in warm air heated greenhouse. Protected Hort. Plant Fac. 16(4):291-296.