1) inclination design
In order for the solar cell module to receive as much solar radiation as possible in a year, we need to choose an optimal Angle for the solar cell module.
The discussion on the optimal tilt Angle of solar cell module has appeared in many academic journals. This street lamp is used in changsha. According to the design and references to relevant literature, the inclination Angle of photosynthetic solar cell module bracket in changsha is selected as 16o.
2) wind resistant design
In the solar street lamp system, the wind resistance design is a very important problem in the structure. The anti-wind design is mainly divided into two parts: one is the anti-wind design of battery component bracket, and the other is the anti-wind design of light pole. The following two pieces are analyzed respectively. Wind resistance design of stand for solar cell components
According to the technical parameters of the battery module manufacturer, the upwind pressure that the solar cell module can withstand is 2700Pa. If the wind resistance coefficient is set at 27m/s (equivalent to a category 10 typhoon), according to non-viscous fluid mechanics, the wind pressure on the battery module is only 365Pa. Therefore, the component itself can withstand the wind speed of 27m/s without damage. Therefore, the key consideration in the design is the connection between the battery component bracket and the light pole.
In the design of this set of street lamp system, the connection between battery module bracket and lamp pole is fixed and connected by bolt rod.
The lamp pole wind resistance design
The parameters of the street lamp are as follows:
Panel inclination A = 16o lamp pole height = 5m
The welding seam width at the bottom of the light pole is = 4mm, and the outer diameter at the bottom of the light pole is = 168mm
The welding surface is the lamp post failure surface. The distance between point P of moment W on the failure surface of the light pole and the action line F of the panel load on the light pole is
PQ = [5000+ (168+6) /tan16o] Sin16o = 1545mm=1.545m. Therefore, the moment of action of wind load on the failure surface of the light pole M = F 1.545.
According to the design of 27m/s, the maximum allowable wind speed is 2 30W, and the basic load of the photosynthetic solar street lamp panel in changsha is 730N. Considering the safety factor of 1.3, F = 1.3 730 = 949N.
So, M = F 1.545 = 949 1.545 = 1466n.m.
According to mathematical derivation, the moment of resistance of the annular failure surface will be (3r2 +3r 2+ 3).
In the above formula, r is the inner diameter of the ring, and delta is the width of the ring.
Destruction surface resistance W = (3r2 +3r 2+ 3)
(3 842 4+3 84 42+43) = 88768mm3
= 88.768 x 10-6 m3
Stress caused by moment of action of wind load on failure surface = M/W
= 1466/ (88.768 10-6) =16.5 106pa = 16.5mpa <<215Mpa
Among them, 215 Mpa is the bending strength of Q235 steel.
Therefore, the width of the welding seam selected by the design meets the requirements. As long as the welding quality can be guaranteed, there is no problem with the wind resistance of the light pole.