Modern agricultural glass greenhouses are mainly the Venlo type glass greenhouses in the Netherlands. What are the main structural features? Let's know together.

Glass greenhouse has the advantages of high light transmittance, long service life and convenient maintenance. In construction, it has many advantages, such as small component section, simple construction and installation, etc. The commonly used spans of glass greenhouses are 6.4m, 9.6m, 10.8m, 12.8m, etc. the spacing between columns, that is, the commonly used spacing between columns, is 4m, 8m and other specifications, and the greenhouse eaves are 3-10 high. The materials used for the main structure of glass greenhouses are hot-dip galvanized light steel structures, and the roof beam surface inlaid with glass is special aluminum alloy profiles; Most of the top covering materials are 5mm thick float tempered glass or 4mm tempered diffused glass. The surrounding covering materials are hollow tempered glass with specifications of 4 + 9 + 4, 5 + 6 + 5, 5 + 9 + 5, etc. The foundation is reinforced concrete independent column foundation, and reinforced concrete ring beams are poured around.

Glass greenhouses are unmatched by other types of greenhouses because of their high light transmittance, uniform illumination, good sealing performance, good ventilation effect, high roof drainage efficiency and high construction intensity. This shows that glass greenhouses still have a place in facility agriculture, and the composition of glass greenhouses is generally the following main systems.

Main structure

The main structure of the glass greenhouse is made of hot-dip galvanized steel. All aluminum alloys on the roof and end face are adopted in accordance with national standards, and their specifications and dimensions are finalized and processed.

Ventilation system

The glass greenhouse top opening window and water curtain outward turning window are mainly used to promote the indoor air circulation of the glass greenhouse, improve the indoor air quality, facilitate ventilation and cooling in summer, reduce humidity, etc.

External sunshade system

The external shading system of the glass greenhouse is installed on the horizontal plane of 0.5m at the top of the ridge of the glass greenhouse, and the system moves in the longitudinal direction. Motor driven, rack and pinion system.

Inner shading system

The shading system in the glass greenhouse is installed on the horizontal plane of the upper beam in the glass greenhouse, and also moves along the longitudinal direction. The motor is used to drive the rack and pinion control switch.

Fan wet curtain cooling system

The fan wet curtain cooling system of glass greenhouse is a common cooling method in glass greenhouse, which is suitable for greenhouse projects with small area. Generally, the wet curtain is installed on the back end wall of the greenhouse, and the fan is installed on the south end wall. The fan adopts axial-flow negative pressure fan, and the common specifications are mostly 1380. The wet curtain adopts 100mm thick corrugated paper evaporation wet curtain. The article is published by manager Zhang of Guangyuan greenhouse, If reprinted, please keep the copyright information. When the fan is started, negative pressure will be generated in the room, forcing the indoor unsaturated air to enter the greenhouse through the porous wet surface of the wet curtain, flow out from the fan, and take away the indoor heat through heat absorption to achieve the purpose of cooling. The wet curtain consists of wet curtain curtain, water pump, filter, control valve, water supply pipeline, water discharge pipeline, valve, motor pump, etc. Focus on greenhouse engineering technology and serve modern agriculture.

Heating system

The heating of glass greenhouse in winter is the most important energy consumption factor. Therefore, the selection of heating equipment will affect the investment, operation cost and future economic benefits of greenhouse to a great extent.

There are many ways to heat the greenhouse. I only choose the electric boiler heating mode that is more economical and widely used in recent years. It is mainly composed of boiler, water pipeline and finned tube, which can be heated by electric heat storage at night.

Agricultural Internet of things

The Internet of things system of glass greenhouse is to configure the Agricultural Internet of things system in the development of traditional glass greenhouse, which is commonly known as intelligent greenhouse. Modern agricultural demonstration planting greenhouse equipment belongs to the category of facility agriculture. Facility agriculture is a modern agricultural method that uses engineering and technical means to produce animals and plants efficiently under the condition of relatively controllable environment, also known as controllable environment agriculture. Facility agriculture spans many disciplines and needs supporting facilities: hardware equipment, software control system and planting and breeding technology linked by the Internet of things.