One of the most important issues in greenhouse is ventilation and proportional humidity. Relative humidity in greenhouses should be 60-70%. Higher relative humidity increases growth and stops root growth. Lower relative humidity is undesirable as it increases evaporation in the greenhouse. Greenhouse windows should have a 40% ventilation opening relative to the floor area for good temperature and humidity control. Therefore, large window sizes are needed. Window profiles must be resistant to wind loads and vibrations as carriers. As in the beam profile, the clamped profile, which is designed as half oval, provides minimum contact from the tangential point to the plastic cover, it is an ideal form with high moment of inertia values and high strength and carrying property. The opening and closing system is made automatically by the motors with reducer suitable for automation.
We have observed that the most important problem with greenhouse windows is distortions and axial shifts of the window handles. As a solution, the window handles were placed every 1.5 meters instead of being placed at 3 meters. The skewing, sliding and bending problems in the windows were solved by placing diagonals from the moment reset points. Half oval window profile is 30×40 in size and 2 m in length.