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  • Name: Photovoltaic Smart Greenhouse

High-intensity photovoltaic smart greenhouse:


With the shortage of energy and the worsening of environmental degradation, there is an urgent need to use green energy to solve existing problems. As an important part of new energy, photovoltaic industry, with the decline of PV module prices and the maturity of technology, PV greenhouses have gradually entered people's lives. This paper mainly analyzes and studies the existing problems of the external structure, internal system and photovoltaic layout of the photovoltaic greenhouse. Through the optimization design of existing problems and the advantages of the multi-story photovoltaic greenhouse, the external structure, supporting facilities and growth of the greenhouse are carried out. Improved design of the monitoring system. Use a photovoltaic panel mounted on the roof to convert solar energy into a power source suitable for different environmental applications, and configure the battery to store electrical energy. The converted electricity can be directly supplied to the greenhouse for internal use, and the surplus electricity can be incorporated into the national grid for subsidies. Firstly, the background, purpose and significance of the research are analyzed. The literatures are used to analyze the research in related fields at home and abroad. By introducing the general situation and characteristics of agricultural greenhouse solar greenhouses, the construction of high-intensity photovoltaic intelligent greenhouses is analyzed from external structure to internal. The construction of auxiliary equipment, and the factors affecting the greenhouse construction from the geographical, climate, and cost; in terms of structure, the greenhouse unit division, performance, design principles for the analysis of the multi-storey photovoltaic greenhouse, and based on existing problems, the photovoltaic The layout design and photovoltaic power generation system have been optimized for structure design, and the optimal design method has been proposed. Then, through the demand analysis of the internal auxiliary equipment of the photovoltaic greenhouse, according to the demand analysis and the problems of the photovoltaic greenhouse, the photovoltaic greenhouse The main temperature and humidity monitoring system and growth monitoring system were improved and designed. Finally, the case application of the multi-span photovoltaic greenhouse was analyzed to understand its development conditions, the external structure of the project, internal auxiliary equipment, and the benefit analysis of photovoltaic power generation. The benefits of energy saving and emission reduction have verified the advantages of a multi-story photovoltaic greenhouse.

The installation of various components of the intelligent greenhouse is directly related to the service life, insulation performance and safety performance of the greenhouse in the future. Therefore, it is necessary to work cautiously and not too casually.

In the intelligent greenhouse installation process should follow the principle of bottom to top, high to low, from outside to inside, first underground and then on the ground.

The greenhouse construction and installation sequence is a greenhouse shed skeleton, an outer sunshade, a top tab, a surrounding, a wet curtain fan, an inner sunshade, a control, a heating, a seedbed, and a water supply.

First, the installation of the greenhouse skeleton

The installation sequence of the greenhouse shed skeleton is the main column one day ditch (including the outer visor column), one analysis frame, one auxiliary column, one horizontal support, one arch, one rubbing strip, one outer shading, the horizontal longitudinal support, one diagonal lacing

1, Preparation for installation

Recheck the axis control points used for positioning and the leveling point used to measure the elevation. Re-inspection of the frame support and the embedded parts of the support system shall be technically handled when the axis, elevation, levelness, and position of the embedded bolt exceed the allowable deviation. Inspect the hoisting machinery and spreader and set up scaffolding or operating platform according to the requirements of the construction organization design.

2, Skeleton installation

The components must be installed in accordance with the node requirements of the drawing design. If the components are installed by welding or bolting joints, check the joints and weld them or strengthen them. The mounting bolt holes are not allowed to be reamed with gas. The permanent bolts must not be padded with more than 2 washers. The length of the exposed bolts of the bolts is not less than 2--3. The welding and high-strength bolt connection operation process is detailed in this process standard. The construction method of the skeleton support and the support system needs to be carefully checked, and the design requirements must be met, and spare parts must not be missed. Gutter joints should be sealed with water-stop glue or water-stop tape. If necessary, do a water shut-off test.

3. Inspection and acceptance

After the skeleton is installed, check the quality of the joints on the site, mainly check the non-perpendicularity of the vertical plane of the two supports in the skeleton span; the side of the skeleton is pressed against the vertical surface of the skeleton, and the above deviation must not exceed the allowable deviation. In order to ensure that the skeleton meets the design and stress requirements and overall stability requirements, the elevation of the skeleton support, the axial displacement, and the mid-span deflection are recorded by measurement.

Second, covering the project

1, Glass installation

Glass installation is divided into framed and frameless installations. The framed installation has a frame support around the glass, the glass edge is sealed by the frame, and the frame has sufficient load bearing strength and rigidity. The greenhouse is generally framed.

The greenhouse is generally made of 4 mm, 5 mm float flat glass. In order to increase the heat preservation, hollow glass can also be used around, and the special aluminum alloy profile is used to inlay the glass on the greenhouse. After the glass is installed, it is inevitably subjected to wind load, seismic load, rain and snow load or other payload. Due to its unique strength characteristics, when the stress exceeds its elastic limit, it is different from polycarbonate, film and other materials. Denature, but break immediately. In order to ensure the safety, reliability and durability of the entire installation structure, the following principles should be followed during installation:

1) The surface and thickness of the glass should be determined according to the payload strength that the glass can withstand. The deflection of the glass is generally not greater than 1/70 of the span.

2) The frame of the fixed glass should have sufficient strength to prevent the glass from being broken due to deformation of the frame. Frame deformation is generally designed to take no more than 1/180 of the span.

3) The periphery of the glass should have a suitable gap with the frame, and the part should be filled with elastic material, and the installation stress should be avoided.

2, PC sun board installation

When ordering, the PC board can require the manufacturer to produce according to the required length and width, reducing the workload of cutting plates at the construction site.

1) Cutting of the PC board. The plate can be cut with a portable electric saw, hacksaw, wallpaper knife, etc. Do not tear off the protective film when cutting, and remove the sawdust from the plate after cutting.

2) Distinguish between the front and the back. The PC board has a protective film on both sides. Generally, the side marked with the mark has an anti-ultraviolet effect, and the side faces outward when installed.

3) Sealing treatment at both ends of the PC board. Before installing the PC board, spread the protective film around 50 mm, tear off the original sealing strip at both ends of the opening, replace the top with a sealed waterproof tape (such as aluminum foil sealing tape), and replace the bottom with a breathable tape.

4) Fixing the PC board. The PC board is fixed on the skeleton with a self-tapping screw, a rubber block is placed between the PC board and the skeleton, and a large washer is placed between the nail cap and the board. Self-tapping screws have a fixed spacing of 0.5 m. The sealant is made of silicone sealant for PC board. The seal is made of EPDM rubber. After installation, the protective film is torn off.

3, Installation of the film

1) Fixing the card slot. The card slot is fixed on the skeleton of the greenhouse with a rivet or self-drilling self-tapping screw, the fixed spacing is 0.3 m, and the corner is cut into 450 to ensure the continuity of the card slot. The spring is a spring steel wire, and the outer surface is coated or dip-coated to increase the corrosion resistance of the circle and increase the smoothness of the surface to avoid damage to the film.

2) Paving of plastic film. When a multi-span greenhouse is paved with plastic film, it usually takes 4-6 people at the same time. The plastic film roll was placed at the end of a spanning greenhouse, and the outward facing side was placed upward and supported by the bracket, leaving two people at the ends, and the remaining installers pulled the plastic film along the gutter to the other end. The person on both sides of the span tightens the film at the same time, and then fixes the plastic film with a snap spring.

3) Installation of the lamination line. For the single-layer orange-covered plastic film on the top of the greenhouse, a plastic film should be pressed against the skeleton along the span of the greenhouse to prevent damage from the plastic film by the strong wind. The laminating line is generally a plastic wire of a steel wire core, and some imported laminating lines are processed by using resin nylon as a raw material, which has the advantages of high strength and anti-aging. The distance between the laminating lines is determined according to the degree of density of the top skeleton. Generally, the fixing of the 1-2 m laminating line is simple in the gutter _L. The protective film line should be installed on the side wall ventilation window to prevent the film roll oscillates under the action of the wind, causing damage to the plastic film or poor sealing. The film line can be installed vertically or diagonally, and the upper and lower ends can be fixed in the card slot by spring hooks.