In cities, the tallest rooftops have the best potential for electricity production. They often combine good wind and solar conditions with available space. Rooftop-mounted photovoltaic (PV) panels have already proven their efficiency and profitability. For tall rooftops with good wind conditions, also small wind turbines can be economically viable. However, hybrid PV-wind systems apparently have never been studied for these limited spaces. In this work, we study the technical, economic and environmental performance of hybrid PV/wind systems installed on tall buildings. From the rooftop plan, the building electricity consumption and the solar and wind resources of a roof, we developed an algorithm that generates hybrid retrofitting configurations and calculates their global performance. We then use the algorithm for two high-rise buildings in the Brussels-Capital Region.

For these two real case studies, in which all building and energy characteristics are known (i.e. rooftop plan, energy consumption) and where we measured wind and solar resources, we observe that hybrid PV/wind systems show good technical, economic and environmental performance. They also offer a good trade-off between economic and environmental objectives. However, we observe that the shadow impact from the turbines on PV panels is much larger than for ground-based hybrid installations (about 1% to 8% annual loss of irradiance).

在城市中，最高的屋顶具有最大的发电潜力。它们通常将良好的风和日光条件与可用空间结合在一起。屋顶安装的光伏（PV）面板已经证明了其效率和盈利能力。对于具有良好风力条件的高屋顶，小型风力涡轮机在经济上也是可行的。但是，混合光伏-风系统显然从未针对这些有限的空间进行过研究。在这项工作中，我们研究了安装在高层建筑上的混合光伏/风能系统的技术，经济和环境性能。根据屋顶计划，建筑物的电力消耗以及屋顶的太阳能和风能，我们开发了一种算法，该算法可生成混合改造配置并计算其整体性能。

对于这两个真实的案例研究，在这些案例中，所有建筑物和能源特性都是已知的（即屋顶计划，能源消耗），并且我们在其中测量了风能和太阳能资源，我们观察到混合光伏/风能系统具有良好的技术，经济和环境性能。它们还提供了经济和环境目标之间的良好折衷。但是，我们观察到涡轮机对光伏面板的阴影影响要比地面混合动力装置大得多（每年损失约1％至8％的辐照度）。