Investigation Into The Wind Loading Characteristics Of Roof-Mounted Solar Panels On A Tall Building By Wind Tunnel Testing

With the development of urbanization,solar energy as a kind of clean renewable energy applied in the ecological design of tall buildings is bound to become a development trend.Roof photovoltaic power generation is an important way of solar energy application in architecture.For roof PV system,wind load is the main load on solar panels.Previous studies on wind load of rooftop solar panels mainly focused on the installation of low building roofs,but with the integration of photovoltaic buildings and the promotion of green and energy-saving building concepts in cities,more and more urban high-rise residential roofs began to install solar panels.No one at home and abroad has conducted relevant research on wind load characteristics of solar panels on tall building roofs,and there is no corresponding specification for wind load value of solar panels.Therefore,the study on wind load of solar panels on high-rise roofs has important academic value and engineering significance.The wind load of the solar panels is affected by the solar panel's own parameters and building parameters.This topic conducted wind tunnels to obtain the surface wind pressure of the solar panels.The research on the wind load of solar panels mounted on tall buildings is divided into isolated panel and array panel.The research parameters of isolated panel include: solar panel size,installation inclination angle and roof installation position.A 3 ? 3 array was selected as the installation block based on the isolated panel mounting position,and the array research parameters included the array lateral interval and the longitudinal interval.In addition,this topic also focuses on the interference effects between arrays,and introduces interference factors to quantify the interference effects.In addition to the study of the parameters of the panel itself,this topic also studies the influence of the height of the building's parapet on the wind load of the solar panel.The study found that due to the large shear separation layer on the roof of the tall building,the entire roof under the wind direction ?=0° is in the negative pressure zone,and the mean and peak net wind loads of the isolated panel are both negative wind pressure suction,which is low-rise building solar panels are just the opposite.The most unfavorable extreme wind load of a isolated panel increases first and then decreases with the installation inclination angle,while the low-rise building solar panels gradually increase with the inclination angle.For the solar panel installation location,the study found that the most unfavorable installation location is located at the rear corner of the roof,the most unfavorable extreme net wind coefficient of-3.39,and the safest installation location is located at the center of the rear of the roof.In addition,based on the monolithic panel study,the array interference effect is mainly manifested by the upstream panel occluding the array of the downstream panel.Array spacing has a large impact on the panel at different locations,mainly due to the combination of array interference and roof flow fields.The building parapet has obvious load-weakening effect on the roof monolith.When the parapet wall is 2 m,the most unfavorable extreme net wind load is reduced by nearly 50%,but the load is increased for some positions of the array.In addition to the study of wind load characteristics of solar panels on tall buildings,this paper also fits the curve of the most unfavorable mean and extreme net negative wind coefficient of the panel and the formula within the parameters.In addition,this paper gives the body shape coefficients of isolated and array solar panels under key conditions.It is found that the existing domestic and foreign specifications are conservative,especially for positive pressure.However,the load value is dangerous in some working conditions.Based on the existing specifications,this paper gives recommendations for specification optimization and solar panel installation recommendations,and provides reference for the establishment of wind-resistant design theory for solar panels on tall buildings.