低層建築物屋頂太陽能光電板之受風作用特性研究

In this study, wind tunnel aerodynamic experiment was adopted to investigate the effect of different installation locations to the wind loadings on the photovoltaic array on the roof of a building with various direction angle of wind. The results shows, that the wind load is mainly affected by the installation location and arrangement of the photovoltaic array. In the rows of photovoltaic arrays, the first row close to the edge of the building is most strongly affected by the wind and the rear photovoltaic panels are blocked by the front row. Therefore, wind loadings were reduced a lot. The wind loading on the photovoltaic panel is protected by the shield effect of the parapet wall, and the array of photovoltaic panels retreat. The existence of parapet wall on roof may greatly reduce the wind loadings on the photovoltaic panel and this effect can be extended up to four times of parapet height. Also the retreat of location on roof from the edge for PV array can reduce the wind loading dramatic. According to the comparison of PV wind pressure spectrum and separation shear layer spectrum of roof edge, we found the aerodynamic characteristics of PV are determined by the nearby edge vortices not the PC itself. In the determination of design wind force, the installed solar photovoltaic panels installed on the roof surface are slightly lower than the code proposed value of the open monoclinic roof when the aerodynamic force is used to estimate the designed wind force coefficient under the installation condition of the low end and the floor. Therefore, the adoption of design wind coefficient from the open sloping roof is also conservative.