Multi Span Venlo Glass Greenhouse

The principle of the glass greenhouse: the main form of solar radiation is short-wave radiation (ultraviolet with a short wavelength), and the heat generated after hitting the ground becomes long-wave radiation (infrared with a long wavelength), and glass can block long-wave radiation from entering and exiting, making the indoor environment The temperature keeps rising. According to the greenhouse effect to improve the environment required for crop growth, and then adjust it through factors such as light and ventilation, this is a glass greenhouse. The sun's radiation shines on the earth and heats up the ground. In the glass greenhouse, the increase of carbon dioxide will strengthen the greenhouse effect of the atmosphere. The effect of glass is the same as that of carbon dioxide. The short wave of the sun heats up the room through the glass, and the emitted radiation is blocked by the glass, so the loss of heat can be reduced. The glass can also prevent the indoor space convection, which makes the temperature in the greenhouse higher. outdoors. Making full use of light and increasing the temperature in the greenhouse can reduce the impact of bad weather on crops, allowing crops to be planted even in winter. Glass greenhouses can play a very good role in regulating the air and soil moisture in the greenhouse.

A greenhouse is a process of using the heat energy brought by the sun's radiation, collecting it, and slowly releasing it. But when the sun comes out, the sun's vipers can enter a large number of transparent greenhouses. But for the long-wave radiation on the ground, the greenhouse is not so "transparent". The result of this is that the greenhouse can allow the sun's heat to enter the greenhouse, but it is not easy to go out, and the heat loss is relatively slow, so that it can play a role in heat preservation and adjust the indoor temperature of the greenhouse, which can be used by the plants planted in the greenhouse.
The insulation principle of the glass greenhouse is that the sun's sunlight penetrates a film and the glass is absorbed into the greenhouse, and then the heat is blocked in the greenhouse space, and the temperature will rise with the intensity and time of the sun's irradiation. The ground itself is a heat storage material, and it also has a certain temperature, so that the temperature in the greenhouse is not easy to go out, and the cold air outside cannot enter, so a small constant temperature environment is created, and this original heat-loving vegetable can be grown. Melons
Indoor greenhouse cultivation device, including planting trough, water supply system, temperature control system, auxiliary lighting system and humidity control system; the planting trough is set at the bottom of the window or made into a screen shape for planting plants; the water supply system automatically supplies water in a timely and appropriate amount; The control system includes an exhaust fan, a heat fan, a temperature sensor and a constant temperature system control box to adjust the temperature in a timely manner.
The auxiliary lighting system includes plant lights and reflectors, which are installed around the planting tanks to provide lighting when there is no sunlight, so that the plants can perform photosynthesis and present a beautiful landscape through the refraction of light; the humidity control system cooperates with the exhaust fan to adjust the humidity and reduce indoor temperature
The glass greenhouse improves the thermal insulation performance of the greenhouse and reduces energy consumption. The ratio of the coverage area to the sum of the coverage area and the enemy area of ​​the greenhouse maintenance structure with a large thermal resistance. The larger the insulation ratio, the better the insulation performance of the greenhouse. The article was edited and published by Manager Zhang of Guangyuan Greenhouse. It can also be used in summer to use thermal insulation sunshade curtains to block the sun and prevent excess solar radiation energy from entering the greenhouse. It not only ensures the normal growth of crops, but also reduces the accumulation of indoor energy, thereby reducing the indoor temperature, protecting the crops from strong light burns, and reducing the indoor temperature by 3-5°C; in winter, the thermal insulation curtain can reflect indoor infrared rays to prevent them from escaping and reduce heat loss function, thereby increasing the indoor temperature, reducing energy consumption, and reducing operating costs in winter.
The shade curtain in the glass greenhouse is set on the composite beam of the greenhouse. In summer, using heat-insulating sunshade curtains to block the sun can reduce indoor energy accumulation, lower the temperature (3~5°C), and protect crops from strong light burns; in winter, heat-insulating sunshade curtains can reflect indoor infrared rays to prevent heat dissipation and reduce Heat loss, thereby increasing the indoor temperature and effectively reducing energy consumption. The internal heat preservation system is divided into three areas for independent control, and each span is an independent control area.
The glass greenhouse is a modern greenhouse developed in the early days. Its light transmission rate is high and the overall appearance is beautiful, but the cost is high. Suitable for areas with poor lighting conditions or good economic conditions. Glass is a rigid, light-transmitting material. Therefore, the usual glass greenhouse is a pointed roof. According to the structure, glass greenhouses are generally divided into three types: door steel frame structure greenhouse, truss roof structure greenhouse and Venlo structure greenhouse. The main features of the Venlo-type greenhouse are small component cross-section, simple equipment, long service life and convenient maintenance. The relevant parameters are:
Membrane multi-span greenhouse is an economical greenhouse, which is very popular among users because of its beautiful arc shape and low cost. The curved roof is beautiful and elegant, and the line of sight is smooth. The structure is made of small steel, which has good thermal insulation performance. The manufacturing cost is relatively low, and it belongs to the economic greenhouse, which is suitable for most areas of our country. Double-layer greenhouses are mostly used in the north, and single-layer greenhouses are mostly used in the south. It can illuminate in the visible range of 0.4-0.7 microns. When the film is inflated, a thick air pocket is formed to effectively prevent heat loss and cold air intrusion. The use of double-layer air-filled film can greatly improve the thermal insulation performance of the greenhouse and save operating costs. The top of the covering material is covered with polyethylene drop-shaped longevity film, the outer layer is anti-ultraviolet, and the inner layer is anti-dew. The surrounding material can be covered with polyethylene non-drip longevity film or polycarbonate hollow plate according to user needs.

As we all know, temperature is the basic condition to ensure the normal growth of crops, and the greenhouse is a thermal insulation agricultural facility for the normal and rapid growth of crops. Insulation is an important task in greenhouse agricultural production, so it is necessary to choose suitable covering materials. Generally speaking, glass greenhouses are better than glass greenhouses. Glass greenhouses can play a decorative role in appearance. Compared with plastic greenhouses, glass greenhouses will have relatively fewer problems such as aging and damage; in terms of performance, due to the complexity of the environment , The glass greenhouse can relatively resist various loads (wind load, snow load, etc.). From beauty, durability, wind resistance, rain resistance, sunlight resistance, heat preservation effect and cost, aluminum alloy (or stainless steel) plus plexiglass, plus ordinary glass, low-cost bamboo pool and plastic film, can also be equipped with sunshade net and sprinkler irrigation Drip irrigation sprinkler system, etc. Plants generally need plenty of light and better glass. Of course, the one-time investment cost of plastic is relatively low, but the later maintenance cost is also high, and plastic is easy to age.