Evaluation of the Influences of Different Roof Shapes on the Flow Properties and Performance of Small Wind Turbines

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-06-30 DOI:10.15407/pmach2023.02.024

Alexander Hirschl, Daniel Österreicher

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Abstract

Small wind turbines offer a complement to photovoltaic systems and are becoming an interesting solution in the wake of rising energy prices. The measurement results indicate that some locations on and around the building are not suited for installing wind turbines, while others show increased wind potential. Due to limited space, rooftop mounting is an interesting alternative to free mounting on a mast from a technical point of view. For this reason, the influence of roof shapes on the flow on and behind the building was measured and the performance of two different types of small wind turbines was investigated. The turbines assessed in the project are VertikonM with a vertical axis and helix-shaped rotor blades, and Superwind 1250 wind turbine with a horizontal axis and centrifugal force pitch control. The results showed that there is an average increase in wind speed of 0.2 m/s on gable roofs at hub height (7 m). In comparison, there is an increase of 0.4 m/s on flat roofs at hub height (7 m). In relation to the performance of the turbines, high turbulence on the roof seems to cancel out this effect. The performance of the horizontal axis small wind turbine has not increased in comparison with gable roof and free-standing mast. For the vertical-axis turbine, a power increase by a factor of 2.23 was achieved between free-standing mast and gable roof. Vertical wind flow above the gable roof was identified as the main cause for power increase. The experiment was conducted on the Lichtenegg energy research park (Lower Austria) and its results make it possible to better identify all effects that affect the turbine output power.

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不同屋面形状对小型风力机流动特性和性能影响的评价

小型风力涡轮机是光伏发电系统的补充，随着能源价格的上涨，它正成为一种有趣的解决方案。测量结果表明，建筑物上和周围的一些位置不适合安装风力涡轮机，而其他位置则显示出增加的风力潜力。由于空间有限，从技术角度来看，屋顶安装是自由安装在桅杆上的有趣替代方案。为此，测量了屋顶形状对建筑物内外气流的影响，并对两种不同类型的小型风力发电机的性能进行了研究。项目评估的风机为垂直轴和螺旋形转子叶片的VertikonM风机和水平轴和离心力螺距控制的Superwind 1250风机。结果表明，在轮毂高度为7 m时，山墙屋顶的平均风速增加了0.2 m/s，相比之下，在轮毂高度为7 m时，平屋顶的平均风速增加了0.4 m/s。就涡轮的性能而言，屋顶上的高湍流似乎抵消了这种影响。水平轴小型风力机的性能与山墙屋顶和独立式桅杆相比没有明显的提高。对于垂直轴涡轮，独立桅杆和山墙屋顶之间的功率增加了2.23倍。山墙屋顶上方的垂直气流被确定为功率增加的主要原因。该实验是在Lichtenegg能源研究园区(下奥地利)进行的，其结果使更好地识别影响涡轮机输出功率的所有影响成为可能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.