| 摘要 |
Pressure equalization between upper and lower surfaces of PV modules of an array of PV modules can be enhanced in several ways. Air gaps opening into the air volume, defined between the PV modules and the support surface, should be provided between adjacent PV modules and along the periphery of the array. The ratio of this air volume to the total area of the air gaps should be minimized. Peripheral wind deflectors should be used to minimize aerodynamic drag forces on the PV modules. The time to equalize pressure between the upper and lower surfaces of the PV modules should be maintained below, for example, 10-20 milliseconds. The displacement created by wind gusts should be limited to, for example, 2-5 millimeters or less. For inclined PV modules, rear air deflectors are advised for each PV module and side air deflectors are advised for the periphery of the array. |
| 主权项 |
1. A PV system for mounting on a support surface, the PV system comprising:
an array of PV assemblies defining a circumferentially closed perimeter, the array comprising PV modules having a top surface and a bottom surface, at least some of said PC assemblies comprising an inclined PV module, being inclined relative to the support surface, having a lower edge, an upper edge, and inclined side edges, that are inclined relative to the support surface and join the lower and upper edges; PV assembly supports for supporting the PV assemblies on the support surface; perimeter air deflectors positioned outwardly of the perimeter of the array along a portion of the perimeter opposite the inclined side edges of the plurality of inclined PV modules, the perimeter air deflectors having inclined top edges that extend generally parallel to the inclined side edges of the plurality of inclined PV modules; wherein the array has an average weight per unit area of 287 Pa (6 psf) or less; wherein the array has a permeability provided by air gaps within and adjacent to the array that enable airflow between the top and bottom surfaces of the PV modules, the air gaps being positioned and sized so that a volume-to-gap area ratio R(in m)=V (in m3)/Ga (in m2) of 20m or less, where V is an array air volume between the array and the support surface, and Ga is a gap area representing a total area of air gaps that enable airflow into and out of the array air volume; and wherein the air gaps have a gap size of 1.3 cm (0.5″) to 50.8 cm (20″). |
