Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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A Study on the Control of the Temperature and Relative Humidity in Greenhouse by Adjusting the Amount of Natural Ventilation and Fog Spray Quantity

자연환기량과 포그분무량 조절에 의한 온실 온습도의 동시제어 기법 연구

  • Kim, Youngbok (School of the Agro-system Engineering, Major in the Bio-Machinery Engineering, CALS, IALS, Gyeongsang National University) ;
  • Sung, Hyunsoo (School of the Agro-system Engineering, Major in the Bio-Machinery Engineering, CALS, Gyeongsang National University) ;
  • Hwang, Seungjae (Department of Horticulture, CALS, IALS, Gyeongsang National University) ;
  • Kim, Hyeontae (School of the Agro-system Engineering, Major in the Bio-Machinery Engineering, CALS, IALS, Gyeongsang National University) ;
  • Ryu, Chanseok (School of the Agro-system Engineering, Major in the Bio-Machinery Engineering, CALS, IALS, Gyeongsang National University)
  • 김영복 (경상대학교 애그로시스템공학부 생물산업기계공학전공, 농업생명과학연구원) ;
  • 성현수 (경상대학교 애그로시스템공학부 생물산업기계공학전공, 대학원) ;
  • 황승재 (경상대학교 원예학과, 농업생명과학연구원) ;
  • 김현태 (경상대학교 애그로시스템공학부 생물산업기계공학전공, 농업생명과학연구원) ;
  • 유찬석 (경상대학교 애그로시스템공학부 생물산업기계공학전공, 농업생명과학연구원)
  • Received : 2016.08.06
  • Accepted : 2016.10.10
  • Published : 2016.10.30
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Abstract

To develope a greenhouse fog cooling system to control the temperature and relative humidity simultaneously to the target value, a theoretical analysis and experiments were done. The control process includes the measuring of environmental variables, setting and coding of the water and heat balance equations to maintain the target temperature and relative humidity in greenhouse, calculating of the open level of the greenhouse roof window that governs the natural ventilation and spray water quantity, and operating of the motor to open/close the roof window and pump to spray for water. The study results were shown to be very good because the average air temperature in the greenhouse was kept to be about $28.2^{\circ}C$ with the standard deviation of about $0.37^{\circ}C$ compared to the target temperature of $28^{\circ}C$ and the average relative humidity was about 75.2% compared to the target relative humidity was 75% during the experiments. The average outside relative humidity was about 41.0% and the average outside temperature was $27.2^{\circ}C$ with the standard deviation of about $0.54^{\circ}C$. The average solar intensity in the greenhouse was 712.9 W. The wind velocity of outside greenhouse was 0.558 m/s with the standard deviation of 0.46 m/s.

Keywords

References

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