Study Of Wind Load Characteristics Of Solar Cell Modules Mounted On Roofs By Sind Tunnel Experimental Test

Domestic and international statistics show that the largest part of destroyed buildings in the wind disaster are low buildings and some ancillary components. PV systems as a kind of ancillary components of low-rise buildings is placed to the flat roof construction and carport roof, used for power generation. In order to ensure reliable operation, the wind resistance design of PV system is very necessary. For this, the geometric scale of the PV system models mounted on low-rise building flat roof is 1:25, and for the PV system models mounted on carport roof, the scale is 1:50. Based on the detailed results of wind pressure from a wind tunnel test on a rigid model, the distribution of the wind loads was discussed. the main conclusions are as follows:(1) Through the research into the distribution regularities of mean wind-pressure coefficient,rms wind-pressure coefficient, and extreme wind-pressure coefficient of low-rise building flat roof, including parapet wall- free condition and 4 parapet walls of different heights, the suggested values in the wind-load design of flat roof buildings by taking into account of different parapet wall heights are provided.(2) Study is carried out on the wind load characteristics of single-line and multiline array flat roof PV system, the result shows: single-line PV system modules are mainly influenced by wind suction; wake zone modules may be exposed to the effect of wind pressure; Multi-array PV system on roof is also mainly affected by the wind suction effect, and the wind suction force in marginal area is larger than that in interior area. Most unfavorable values of components usually occur in diagonal wind direction.(3) A comparative study on the wind-load characteristics of single-line and multiple-line array PV system modules is conducted, whose results indicate that the wind-load of Multi-array PV system modules is less than that of single-line PV system modules. The most critical mean wind-pressure, and the corresponding interference factors of most critical extreme wind pressure coefficient of the multi-array PV system on the five positions on the roof surface are given.(4) Research has been conducted on the influence of the panel angle, distance of multi-array, and parapet-wall height on wind load characteristics of multiple-line array PV system, whose results show that the decrease of distance of multi-array, the increase on the height of parapet walls, and the decrease of the panel angle can reduce the wind load of PV system.(5) Research has been carried out on the wind load characteristics of PV systems on the roof surface of single-slope and double-slope carport roof, providing the design values of the most critical positive shape coefficient, the most critical negative shape coefficient, the most critical largest peak wind-pressure coefficients and most critical least peak wind-pressure coefficient under all wind directions when the inclinations of carport roof are 20 ° and 30 °.