Bay-type greenhouse with optimal performance

A “span” type greenhouse designed to be installed in “multi-span” runs each covering several thousand square meters uninterrupted, said “span” type greenhouse comprising a plurality of structural units installed parallel to one another over the entire length of a bay defined under the span;

• each structural unit including two side vertical posts having a height greater than or equal to 3.5 m, separated by a bay width greater than 9 m and supporting roof-forming arch segments at their top ends, the arch segments meeting at the center of the greenhouse, the structural units being connected together at the top ends of the posts via longitudinal gutters;
• the surfaces of the greenhouse being adapted to receive a transparent roof covering made up of one or more plastic films;
• said greenhouse having a ratio of a distance between the top of the greenhouse and the horizontal straight line passing through the top ends of the side vertical posts over the bay width less than ⅕;
• said greenhouse having central double opening windows hinged along hinge axis at the top of the greenhouse, these double opening windows being such that each side opening windows has a width between the hinge axis and the end of the opening window equal to 1.4 m, the end of the opening window coming to rest on side lintels on closure;
• the transverse profile of the greenhouse with its opening windows closed being such that, on either side of the greenhouse, the angle formed between the straight line that is tangential to the arch segment in the transverse plane of the greenhouse at the side lintel and the straight line intersecting the hinge axis and the end of the closed side opening window in the transverse plane of the greenhouse is non-zero in the direction of the concave side of the profile of the greenhouse, this break in slope procuring a slope for the closed opening window that is at least about 15°.