Yachen Sun;Encai Bao;Chenmeng Zhu;Lulu Yan;Yanfei Cao;Xuanhe Zhang;Jianming Li;Haiwei Jing;Zhirong Zo

Key Laboratory of Protected Horticultural Engineering in Northwest, Ministry of Agriculture, Department of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China;Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Science, Key Laboratory of Protected Agriculture Engineering in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China;1. Key Laboratory of Protected Horticultural Engineering in Northwest, Ministry of Agriculture, Department of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China;Department of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China;College of Management, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong, China;Key Laboratory of Protected Horticultural Engineering in Northwest, Ministry of Agriculture, Department of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, Chin; 4. Department of Horticulture, Xinyang Agriculture and Forestry University, Xinyang 464000, Henan, China

CFD modeling;window opening styles;cooling effects;solar greenhouse;HEAT-TRANSFER;VENTILATION;EFFICIENCY;HUMIDITY;DESIGN;FLO

Solar greenhouse is extensively used in horticultural production in China. Natural ventilation is one of the key technological means to adjust the inside environment of greenhouse, while the effects of window opening styles on the inside environment are still not well understood. In the present study, the temperature and air flow field of five operation styles, namely back roof central opening style (G1), back roof evenly spaced opening style (G2), top roof full opening style (G3), style of G1 G3, and style of G2 G3 were simulated using the CFD method. The results indicated that: (1) the simulated and measured results exhibited favorable agreement, with relative errors within 5%; (2) In the case of the windows opening area was the same and only single ventilation style was applied, back roof full opening style exhibited the best cooling effect. The inside average temperature of the greenhouse with G1 style decreased by 0.5°C and 1.6°C respectively compared with those of greenhouses with G2 and G3. (3) The cooling effect of the style of G2 G3 was more favorable than that of the style of G1 G3. The style of G2 G3 exhibited better cooling effect than the single ventilation styles, with the lowest temperature (27.5°C) and temperature uniformity coefficient (0.36).