Large-span M-shaped greenhouse with superior wind resistance and ventilation performance

In order to reduce wind-caused disasters and reduce the cost of production in summer, the large-span M-shaped greenhouse with superior wind resistance and cooling performance is proposed. This paper carries out a research on the optimization with the V-angle of M-shaped greenhouse, and the wind effect and ventilation performance of the optimized M-shaped greenhouse and ordinary large-span arch greenhouse (ordinary arch greenhouse) are studied and comparatively analyzed. It is obtained that the wind resistance of M-shaped greenhouse is optimal at a V-angle of 95 degrees. For the four cases of relatively large net wind pressure coefficients of opening windward side vent, leeward side vent, side vents and top vents, the maximum net wind pressure coefficients of M-shaped greenhouse are lower than those of ordinary arch greenhouse. M-shaped greenhouse has higher ventilation ef-ficiency and slightly lower temperature than ordinary arch greenhouse. It can be seen that M-shaped greenhouse has excellent wind resistance in both closed and open states, and has good ventilation and cooling effect in summer. It can be widely used in agricultural production as new wind-resistant cooling plastic greenhouses.