Venlo Greenhouse Completed in UAE

The "Venlo" type greenhouse originated from the Netherlands. It is a small surface glass greenhouse. Its main features are as follows:

1. The biggest feature of the "Wenluo" greenhouse is its high light transmittance, because the roof is at 26.5 when the sun is incident the most, plus it reduces the size of the greenhouse roof components, and the use of small-section aluminum alloy profiles greatly reduces the load-bearing The shading of components is also a major feature of its small steel consumption. The overall steel consumption of the greenhouse is less than 5kg/m'.
2. Unique skylight design: "Wenluo" type greenhouse cooling mainly depends on opening windows on the roof of the greenhouse, using natural ventilation to cool down, allowing hot air to escape from the top. , through the overall drive control of the rack and pinion, the length of each skylight is 1.5m, the width is 0.8m, and the ventilation window ratio is 18.75% (that is, the ratio of the roof window area to the ground area). When the covering material is PC hollow board, in order to increase the ventilation window ratio of the greenhouse, the roof adopts a full-length skylight with a width of 1.0~1.2m, so that the ventilation window ratio can reach more than 37%.
3. Internal heat preservation and shading system: Because the climate in the Netherlands is a temperate marine climate, there is no need for heating equipment. The internal shading net is mainly used for heat preservation. The heat preservation and shading screen has the function of reflecting infrared rays in the greenhouse, which can reduce the heat Dissipation, increase the temperature in the greenhouse, can block the sun and reduce the indoor temperature in summer; at the same time, it can prevent moisture from escaping and maintain indoor humidity.
1. Greenhouse structure: Due to the high requirements for snow load and wind load in some areas of our country, the greenhouse structure should be enlarged, and some load-bearing components should be added on the roof. Large gutter cross-sectional area.
2. Greenhouse external shading: summer is hot in most areas of our country, and there is sufficient light. An external shading system should be installed on the top of the greenhouse. Use the shading net to directly block part of the solar energy outside. The appropriate shading rate can be selected according to the requirements of indoor plants. Choose a shading rate of 50% to 70%, and use the external shading system to reduce the indoor temperature by 3°C to 5°C.
3. Forced cooling: In areas with hot summer, in addition to systems such as external sunshades and skylights, fans and water curtains must also be equipped with forced cooling systems. The wet curtain and the fan are set opposite to each other, and the effective distance should not exceed 60m. It uses the principle of negative pressure ventilation and evaporative cooling. Through the negative pressure of the fan, the air enters the room through the water curtain, and at the same time causes the water to evaporate and absorb heat to achieve the purpose of cooling. . Generally, forced cooling combined with external shading and internal shading systems can ensure that when the outdoor temperature is 40°C, the indoor temperature will not exceed 30°C.
4. Heating system: Heating system should be equipped in most areas of our country.
5. Cultivation seedbed: divided into fixed and mobile. The main frame is made of hot-dip galvanized steel, the frame is made of anodized aluminum alloy profiles, and the bed surface is covered with galvanized mesh. The advantage of moving the seedbed is that it increases the utilization rate of the greenhouse from 50% to 80%. When moving on one side, a suitable working channel can be created between any two seedbeds. The width of the seedbed is generally about 1.7m, and the length of some can reach 40m, the mobile seedbed should have an anti-turnover limit device.
6. Irrigation system: At present, there are three main types of irrigation in greenhouses: mobile sprinkler irrigation, fixed sprinkler irrigation, and drip irrigation. Mobile sprinkler irrigation is divided into single-track or double-track sprinkler irrigation. It adopts suspended installation. It can irrigate plants by itself by designing the walking program. Double-track sprinkler irrigation can move between spans through the transfer frame, saving manpower and material resources. Can double as a transport track.
Fixed sprinkler irrigation mainly uses upside-down nozzles to irrigate plants, and users can also use them as humidification systems by selecting different degrees of atomizing nozzles. Drip irrigation is divided into two forms: drip irrigation pipe and drip arrow. It is fixed in a certain area, so it is suitable for vegetable and seedling greenhouses. The water saving rate of drip irrigation can reach 85%.
7. Computer control system: It mainly sets the growth conditions required for plant growth such as light, temperature, and humidity, and then based on internal temperature, humidity, light sensors and outdoor weather station temperature, humidity, light, rain, wind speed sensors , to control the operation of related equipment and give the most suitable conditions for plant growth. It can save labor resources, improve productivity, and realize unmanned management.