Study on environmental ventilation characteristics of agricultural solar greenhouses

Taking a solar greenhouse in Lhasa, Tibet as the research object, combined with greenhouse measured data and CFD numerical simulation calculations, the characteristics of wind pressure ventilation, thermal pressure ventilation and coupled ventilation in the greenhouse are studied, and the distribution laws of Re, wind pressure, Gr, thermal pressure, temperature and wind speed in crop and non-crop areas in the greenhouse are obtained. The greenhouse ventilation volume is the largest under wind pressure driving, is the second under coupled wind pressure and thermal pressure driving, and is the smallest under thermal pressure driving. Based on MATLAB, the ventilation volume data are fitted by multiple nonlinear regression, wind speed influence factors and temperature influence factors in different quarters are obtained, and a calculation model for greenhouse ventilation volume is constructed.