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http://dx.doi.org/10.21289/KSIC.2017.20.1.008

Comparative Study on Efficiencies of Naturally-Ventilated Multi-Span Greenhouses in Korea  

Kwon, Soon-Hong (Dept. of Bio-Industrial Machinery Eng., Pusan National Univ.)
Jung, Sung-Won (Dept. of Bio-Industrial Machinery Eng., Pusan National Univ.)
Kwon, Soon-Gu (Dept. of Bio-Industrial Machinery Eng., Pusan National Univ.)
Park, Jong-Min (Dept. of Bio-Industrial Machinery Eng., Pusan National Univ.)
Choi, Won-Sik (Dept. of Bio-Industrial Machinery Eng., Pusan National Univ.)
Kim, Jong-Soon (Dept. of Bio-Industrial Machinery Eng., Pusan National Univ.)
Publication Information
Journal of the Korean Society of Industry Convergence / v.20, no.1, 2017 , pp. 8-18 More about this Journal
Abstract
This research analyzed the ventilation effect of the multi-span greenhouse based on the types of greenhouse structure, weather conditions, and locations inside the greenhouse. To compare and analyze the ventilation effects with different types of greenhouse, the uniform environmental conditions should be selected in advance. But these factors are not controlled and require tense many precision facilities and labor forces. Thus, the CFD simulation was used for the air stream to be analyzed qualitatively and quantitatively. In addition, for the ventilation effect analysis, the TGD (Tracer Gas Decay) was used to overcome the shortcomings of the current ventilation measurement method. The calculation error of ventilation rate using TGD was low (10.5%). Thus, the TGD is very effective in calculating the ventilation efficiency. The wind direction of 90 degrees showed the best ventilation effect. The ventilation rate also decreased along the air circulation path, and the rate was the lowest around the outlet. The computed fluid method (CFD) turned out to be a power tool for simulating flow behavior in greenhouse.
Keywords
Multi-span Greenhouse; Ventilation Effects; Computed Fluid Method;
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