Analysis of the Climate inside Multi-span Plastic Greenhouses under Different Shade Strategies and Wind Regimes

文献类型： 外文期刊

第一作者： He, Keshi

作者： He, Keshi;Chen, Dayue;Huang, Zhenyu;Sun, Lijuan;Liu, Zhenglu

作者机构：

关键词： natural ventilation;numerica] simulation;shade combination;shade height;shade screen;solar radiation

期刊名称：KOREAN JOURNAL OF HORTICULTURAL SCIENCE & TECHNOLOGY （ 影响因子：0.589； 五年影响因子：0.443 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： In this work, the effects of shade combination, shade height and wind regime on greenhouse climate were quantified. A two-dimensional (2-D] computational fluid dynamics [CFD) model was developed based on an 11-span plastic greenhouse in eastern Chinafor wind almost normal to the greenhouse orientation. The model was first validated with air temperature profiles measured in a compartmentalized greenhouse cultivated with mature lettuce [Lactuca sativa L., 'Yang Shan'). Next, the model was employed toinvestigate the effect of shade combinations on greenhouse microclimate patterns. Simulations showed similar airflow patterns in the greenhouse under different shade combinations. The temperature pattern was a consequence of convection and radiation transfer and was not significantly influenced by shade combination. The use of shade screens reduced air velocity by 0.02-0.20 m-s lowered air temperature by 0.2-0.8°C and raised the humidity level by 0.9-2.0% in the greenhouse. Moreover, it improved the interior climate homogeneity. The assessment of shade performance revealed that the external shade had good cooling and homogeneity performance and thus can be recommended. Furthermore, the effects of external shade height and wind regime on greenhouse climate parameters showed that external shade screens are suitable for installation within 1 m above roof level. They also demonstrated that, under external shade conditions, greenhouse temperature was reduced relative to unshaded conditions by 1.3°C undera wind speed of 0.5 m-s whereas it was reduced by merely 0.5°C under a wind speed of 2.0 m-s Therefore, external shading is more useful during periods of low wind speed.

分类号： S6

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