The working principle of solar LED street lamp
Solar cell module bracket
2.3.1 Design inclination angle
In order for solar modules in the year received more solar radiation as much as possible, we want to choose one of the best solar cell module angle.
The best angle on the solar cell module to explore the issue in recent years appeared in a number of academic journals for quite a few. The lights use the area in Guangzhou, according to this design reference the data in the literature [1], the selected stent inclination of solar modules 16o.
2.3.2 wind-resistant design
Solar street lamp system, the structure of a need to attach great importance to the problem is wind-resistant design. Wind-resistant design can be divided into two blocks, one for the battery component stent wind-resistant design, two for the poles of the wind-resistant design. The following two were done according to the above analysis.
⑴ solar wind-resistant design components of stent
Battery components manufacturers based on the technical parameters of the information, solar components can withstand wind pressure of 2700Pa. If the wind factor chosen as 27m / s (equivalent to 10 typhoons), according to non-viscous fluid, the battery components to withstand wind pressure is only 365Pa. Therefore, the component itself is totally affordable 27m / s wind speed and Buzhi Yu damaged. Therefore, the design of key components to consider is the battery bracket with poles connections.
In this set of lights system in the design of the battery components stent designed for use with the poles of the connection rod bolts fixed connection.
The wind-resistant design ⑵ street light pole
Lights of the parameters are as follows:
Panels angle A = 16o poles height = 5m
Designed to select the light pole at the bottom of the poles seam width δ = 4mm bottom diameter = 168mm
Weld failure surface where the surface that the light pole. Poles destroyed the calculation of surface resistance moment W point P to the poles of the battery plates by the role of the role of the line load F a distance PQ = [5000 + (168 +6) / tan16o] × Sin16o = 1545mm = 1.545m. Therefore, the wind load in the role of the surface damage poles moment M = F × 1.545.
According to 27m / s the design of the maximum allowable wind speed, 2 × 30W dual-lamp solar street lamp solar panels of the basic load of 730N. 1.3 to consider the safety factor, F = 1.3 × 730 = 949N.
Therefore, M = F × 1.545 = 949 × 1.545 = 1466N.m.
Based on the mathematical derivation of a round circular failure plane to resist moment W = π × (3r2δ +3 rδ2 + δ3).
On the equation, r is the circle diameter, δ is the width of rings.
Failure surface resistance moment W = π × (3r2δ +3 rδ2 + δ3)
= π × (3 × 842 × 4 +3 × 84 × 42 +43) = 88768mm3
= 88.768 × 10-6 m3
Role in the destruction of the surface wind load moments caused by the stress = M / W
= 1466 / (88.768 × 10-6) = 16.5 × 106pa = 16.5 Mpa <<215Mpa
Which, 215 Mpa flexural strength of steel is the Q235.
Therefore, the design of the selected weld width to meet the requirements, as long as the welding quality can be guaranteed, the poles of the wind is no problem.
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