干旱区生态环境知识资源中心(Arid): Spatial distribution of air temperature and relative humidity in the greenhouse as affected by external shading in arid climates

Arid

	Spatial distribution of air temperature and relative humidity in the greenhouse as affected by external shading in arid climates
	Ahmed Hesham A; Tong Yuxin; Yang Qichang; Al-Faraj Abdulellah A; Abdel- Ghany Ahmed M
来源期刊	Journal of Integrative Agriculture
ISSN	2095-3119
出版年	2019
卷号	18 期号:12 页码:2869-2882
英文摘要	The effect of external roof shading on the spatial distribution of air temperature and relative humidity in a greenhouse (T_(in) and RH_(in)) was evaluated under the arid climatic conditions of Riyadh City, Saudi Arabia. Two identical, evaporatively-cooled, single-span greenhouses were used in the experiment. One greenhouse was externally shaded (G_s) using a movable black plastic net (30% transmissivity), and the other greenhouse was kept without shading (G_c). Strawberry plants were cultivated in both greenhouses. The results showed that the spatial distribution of the T_(in) and RH_(in) was significantly affected by the outside solar radiation and evaporative cooling operation. The regression analysis showed that when the outside solar radiation intensity increased from 200 to 800 W m~(-2), the T_(in) increased by 4.5°C in the G_c and 2°C in the G_s, while the RH_(in) decreased by 15% in the G_c and 5% in the G_s, respectively. Compared with those in the G_c, more uniformity in the spatial distribution of the T_(in) and RH_(in) was observed in the G_s. The difference between the maximum and minimum T_(in) of 6.4°C and the RH_(in) of 10% was lower in the G_s than those in the G_c during the early morning. Around 2°C difference in the T_(in) was shown between the area closed to the exhausted fans and the area closed to the cooling pad with the external shading. In an evaporatively-cooled greenhouse in arid regions, the variation of the T_(in) and RH_(in) in the vertical direction and along the sidewalls was much higher than that in the horizontal direction. The average variation of the T_(in) and RH_(in) in the vertical direction was 5.2°C and 10% in the G_c and 5.5°C and 13% in the G_s, respectively. The external shading improved the spatial distribution of the T_(in) and RH_(in) and improved the cooling efficiency of the evaporative cooling system by 12%, since the transmitted solar radiation and accumulated thermal energy in the greenhouse were significantly reduced.
英文关键词	greenhouse temperature humidity distribution uniformity evaporative cooling shading arid climate
类型	Article
语种	英语
开放获取类型	Other Gold
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:6619513
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336215
作者单位	Ahmed Hesham A, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences;;Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures;;Department of Agricultural Engineering, College of Food and Agriculture Sciences, King Saud University;;Department of Agricultural Engineering, Faculty of Agriculture, Sanaa University, ;;Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures;;;;, ;;;;Riyadh;;Sanaa, Beijing;;Beijing;;Saudi Arabia;;Yemen 100081;;100081;;11451;;2124.; Tong Yuxin, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences;;Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, ;;Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, ;;, Beijing;;Beijing 100081;;100081.; Yang Qichang, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of A...
推荐引用方式 GB/T 7714	Ahmed Hesham A,Tong Yuxin,Yang Qichang,et al. Spatial distribution of air temperature and relative humidity in the greenhouse as affected by external shading in arid climates[J],2019,18(12):2869-2882.
APA	Ahmed Hesham A,Tong Yuxin,Yang Qichang,Al-Faraj Abdulellah A,&Abdel- Ghany Ahmed M.(2019).Spatial distribution of air temperature and relative humidity in the greenhouse as affected by external shading in arid climates.Journal of Integrative Agriculture,18(12),2869-2882.
MLA	Ahmed Hesham A,et al."Spatial distribution of air temperature and relative humidity in the greenhouse as affected by external shading in arid climates".Journal of Integrative Agriculture 18.12(2019):2869-2882.