The team used a number of wind tunnel tests with specially designed rigs, together with full-scale testing at BRE, to examine microwind loads for two different turbines - one of 50 m² and one of 11 m² diameter. The case study also included low-powered testing, where a 10 m² turbine was attached to the roof of a small building with a pendulum. The team used a range of data analysis techniques to verify the assumptions made in the simplified theoretical approach to microwind loads, developed for use in the NHBC Foundation guide.
The project aimed to support the design and the installation of wind turbines by developing a new model for microwind loads on houses. The study is part of a wider project on microwind loads on buildings.
The team also examined the loads induced by microwind turbines on a small building under a wide range of conditions, including variations in wind speed and direction, turbine diameter, and height above the ground.
A new multi-case study has been conducted to examine the characteristics of the loads induced by microwind turbines, attached to a 30 m² building, in a number of the most common situations. The comparison of the results of the case study with the simplified theoretical approach show that in most of the cases, the simplified approach can be used to derive the loads on the building. In the specific case of a very small building, however, the simplified theoretical approach does not give an accurate model of the load due to the impact of the building on the wind.
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