期刊
AGRICULTURE-BASEL
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/agriculture12091349
关键词
computational fluid dynamics (CFD); eave height; natural ventilation; venlo greenhouse
类别
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy(MOTIE) of the Republic of Korea [20212020800050]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20212020800050] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study aimed to analyze the natural ventilation efficiency of the CR-Venlo greenhouse and conducted simulations using computational-fluid-dynamics under summer conditions. The results showed that the ventilation efficiency of the greenhouse could be improved by improving the ventilation structure.
A Venlo-type greenhouse with a continuous roof vent (CR-Venlo greenhouse) was proposed by the Ministry of Agriculture, Food and Rural Affairs, South Korea (2019) for natural ventilation even during summers. It is ventilated through the buoyancy effect of the heated air using the high eave elevation. However, the CR-Venlo greenhouse was not distributed domestically, and its ventilation efficiency was not quantitatively evaluated. We aimed to analyze the natural ventilation efficiency of the greenhouse according to the eave height, using computational-fluid-dynamics. The simulation model was analyzed for hot summer conditions. The target greenhouse is ventilated only through the roof vent with all roof windows open; therefore, the air introduced through the roof window is easily exhausted. To evaluate the efficiency of ventilation, the external air entering through the roof window was calculated and evaluated. The amount of incoming air varied greatly with the location of the span and average temperature of the greenhouse; The temperature of the crop zone decreased lognormally with increasing height of the eave. Moreover, the ventilation efficiency of CR-Venlo greenhouse could be increased by improving the ventilation structure such as a shape, position or combination of roof window.
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