Research On Wind Load Of Photovoltaic Array At Different Installation Positions

Photovoltaic system is an important device that utilizes solar energy.Under the influence of strong winds,photovoltaic panels and brackets will be damaged.In order to improve the wind resistance of photovoltaic arrays at different installation positions,this paper uses computational fluid dynamics methods to study roof and external wall photovoltaics The influencing factors of the array wind load provide certain guiding significance for the specific installation of the photovoltaic array.First,study the influence of different wind direction angles,photovoltaic array placement angles and roof overhanging types on the roof photovoltaic panel overturning effect,net load effect and roof flow field distribution.The results show that the change of wind direction angle changes the overturning of the array.The effect and net load have a greater impact.When the placement angle is α=60°～75°,the net load effect of each panel of the photovoltaic array is weak,and the wind pressure distribution on the array surface tends to be uniform.The increase in the placement angle makes The barrier area of the photovoltaic array to airflow is reduced,and the degree of separation is improved.The downward-curved overhanging eaves enhances the overall net load on the entire array of panels.When installing the photovoltaic support,the influence of the downward-curving overhanging eaves on the wind load of the photovoltaic panels should be considered.Secondly,study the installation inclination angle,wind direction angle,photovoltaic building height and the effect of lift,net load on the external wall photovoltaic panels and the influence of the array wind pressure and the flow field around the building.The results show that the most unfavorable wind direction angle of the external wall photovoltaic array is 0 At °,0° wind direction angle,the lift and net load of each plate of the array are stronger,and the wind pressure of each plate of the 75° wind direction angle is relatively uniform,and the difference of the array wind pressure is small.The load on each panel of the array increases with the increase of the installation inclination of the external wall photovoltaic panels.In actual installation,the principle of small inclination should be followed to improve the wind resistance of the external wall array panels.The increase in floor height of photovoltaic buildings increases the load of photovoltaic panels installed in high-rise buildings,which has a greater impact on the wind pressure on the panels inside the array.The specific installation of the external walls should strengthen the strength of the photovoltaic panels and their support frames at the top floor..Finally,by studying the influence of sheltered buildings on the wind load of photovoltaic arrays on the roof and external walls,the results show that:for rooftop photovoltaic systems,the presence of front-end sheltered buildings will affect the load of photovoltaic panels.When the vertical axis angle β is close to 15°,the overturning effect and net load effect of the roof panels are relatively strong.Therefore,when installing the roof photovoltaic system,the influence of the front-end shielding should be considered.For the external wall photovoltaic system,when the height of the sheltered building exceeds that of the photovoltaic building,the wind load on the array is weaker.When the offset distance of the sheltered building is 8～12m,the lift and body coefficient of each panel of the array are small,and the safety performance of the external wall photovoltaic system is higher at this time.Comprehensive research on wind loads at different installation positions of photovoltaic buildings,external factors such as wind direction and sheltering buildings,and internal factors of photovoltaic system installation parameters will all have an impact on the wind load on photovoltaic panels.