Description of photovoltaic greenhouse design

Description of photovoltaic greenhouse design

1. Determine the scale of the greenhouse: first determine the photovoltaic installation capacity of the project, and then preliminarily determine the structural form and scale of various photovoltaic greenhouses according to the installation capacity and agricultural planting plan. If there is a 40MW photovoltaic project, the form and planting area of three greenhouses will be determined according to the agricultural planting plan, one of which is a closed steel structure multi-span greenhouse with an area of 100 mu, and 14 multi-span greenhouses are arranged, each with an area of about 4700 square meters.

2. Determine the overall dimensions of the greenhouse: comprehensively consider factors such as crop planting requirements, photovoltaic module layout, greenhouse cost, etc., determine the length and width of the greenhouse, span, bay, shoulder and other factors, and design the flat elevation scheme of the greenhouse. For example, the external dimension of the above greenhouse is 96mX48m, the span is 12m, a total of 8 spans, a total of 4.00m, a total of 12 rooms, the shoulder height is 5m, the ridge is east-west direction, and the area is 4608m2.

3. Selection of photovoltaic greenhouse components: According to the demand of crops for light, determine which component to use. The photovoltaic modules used in agricultural greenhouses mainly include: 1) Thin-film photovoltaic modules: The modules themselves have a certain degree of light transmittance and are suitable for planting low-light or medium-light-loving varieties; 2) Crystal silicon double-glass modules: There are- 3) Crystal silicon aluminum alloy frame

Components: Completely opaque, suitable for planting shade-tolerant varieties.

4. Calculate the inclination and spacing of the roof: Calculate the inclination of the local component installation, and then determine the roof inclination according to the inclination of the component and other installation requirements. After the inclination angle is determined, it is necessary to calculate the spacing of the multi-span greenhouse roof, which can ensure that the winter solstice will not be blocked from 9:00 to 15:00. The formula for calculating the distance between the front and rear roofs: D=L*cosβ +(L*sinB*cosy)/tana , where is the inclination of the inclined plane; y is the sun azimuth; a is the height of the sun at the winter solstice; L is the width of the inclined plane of the array .

5. Determine the component layout plan: According to the crop lighting requirements proposed by the agricultural major, determine the roof photovoltaic component layout plan, such as full paving, horizontal spacing, vertical spacing, meter spacing, etc.

6. Determine the structural form of the greenhouse: According to the span, length and height of the multi-span greenhouse, determine which steel structure form and steel frame material the greenhouse adopts. According to the characteristics of agricultural photovoltaic greenhouses, in full

Under the premise of meeting the safety requirements, the portal light steel frame structure should be used as much as possible.

7. Determine the greenhouse sealing material: Determine the greenhouse sealing material according to the requirements of the crop on temperature, humidity and light. At present, there are mainly glass, PC board and plastic sealing materials, and the sealing materials should be selected according to the requirements of the crops.