Types Of Greenhouse

8. Classification according to greenhouse ventilation forms 1. Naturally ventilated greenhouse Greenhouses are completely powered by the difference in wind pressure or heat pressure between indoors and outdoors, and are operated through ventilation windows.

The pressure difference between air pressure and outdoor air pressure is always positive. Positive pressure ventilation greenhouses can effectively prevent outdoor pests from entering the greenhouse with the ventilation system, and have good anti-insect effects. Greenhouses that use a box composed of a fan and a wet curtain to supply air to the greenhouse for cooling are typical positive pressure ventilation greenhouses. A semi-enclosed greenhouse that is currently popular in large-scale Venlo-type glass greenhouses is also a typical positive pressure ventilation greenhouse. There is a climate control room on the air inlet side, and the air entering the greenhouse is heated and cooled in the climate control room. The air quality is adjusted by humidifying, removing or adding CO2, and then the conditioned air is sent to the greenhouse through a supply fan connected to a uniform air supply duct. This kind of greenhouse can exchange indoor and outdoor air when the outdoor air quality is suitable. When the outdoor air quality is not suitable, the air in the greenhouse only circulates between the climate control room and the greenhouse. Therefore, this type of greenhouse is called a semi-enclosed greenhouse. .
3. Negative pressure ventilation greenhouse A greenhouse in which the air pressure in the greenhouse is always lower than the outdoor air pressure is called a negative pressure ventilation greenhouse. Negative pressure ventilation greenhouses can ensure that indoor harmful substances or pests will not escape from the greenhouse. Quarantine and isolation greenhouses are typical negative pressure ventilation greenhouses. Negative pressure ventilation greenhouses are generally made of jacket type, with indoor and outdoor isolation achieved through corridors. The air inlet of the greenhouse should generally be equipped with a high-efficiency filtration system.

9. Classification according to greenhouse roof form
1. "Herringbone" roof greenhouse Greenhouses with a "herringbone" roof form are also called pointed roof greenhouses. Greenhouses covered with hard translucent covering materials such as glass and PC hollow boards are basically "herringbone" roof greenhouses. This kind of greenhouse can have one "herringbone" shaped roof per span, such as a portal steel frame structure glass greenhouse, or it can have 2 or more "herringbone" shaped roofs. A typical Venlo-type greenhouse has 2 "herringbone" shaped roofs per span. One or three "herringbone" shaped small roofs.
2. Arched roof greenhouse A greenhouse with an arched roof. The pointed roof greenhouse composed of two semicircular arcs is called a peach-shaped roof greenhouse, which is also classified as an arched roof greenhouse. Plastic greenhouses and plastic film greenhouses are basically arched roof greenhouses.
3. Zigzag greenhouse Greenhouses with vertical vents on the roof are collectively called zigzag greenhouses. The vents of a zigzag-shaped greenhouse can be from the ridge to the gutter, which is called full zigzag, or from the ridge to a certain part of the roof or from a certain part of the roof to the gutter, which is called half zigzag. The former is sharp zigzag. The latter is a blunt serration. Blunt sawtooth greenhouses generally have 2 gutters on each roof. The roof on one or both sides of the vertical vent can be a slope roof, which is called a slope roof sawtooth greenhouse, or it can be a round arch roof, which is called an arch roof sawtooth greenhouse.

4. Flat-roof greenhouses are greenhouses with a horizontal or approximately horizontal roof. Insect-proof net rooms and awnings are often made in this form. The flat-screen movable roof greenhouse recently promoted in Europe is also a typical flat-roof greenhouse. However, if the roof material is a waterproof sealing material, the drainage of the roof and the bearing capacity of the structure should be fully considered.
5. Shaped roof greenhouse is a greenhouse with a certain architectural shape whose roof and/or facade are composed of irregular shapes such as mounds, triangles, polygons, etc. This type of greenhouse is mainly used for ornamental greenhouses and exhibition greenhouses. Some restaurant greenhouses also use various shapes to pursue personalized features.