Environmental Engineering Reference
In-Depth Information
The power was limited by a simple mechanical pitch regulation.
At design wind speed the pitch regulation took over. The blade
speed changes from constant tip ratio to constant speed. After
installation, it worked very well for some time. The project was
stopped because of a mechanical failure.
13.3 
Conclusion
Windmills with water brakes work very well. They are cheap
to build and have high efficiency. They consist mostly of simple
and same mechanical technology. No electricity and wire are
involved. For heating purposes a combination of a water brake
windmill and a solar heating system is perfect. In spite of all
advantages, only a few windmills with water brakes were built
in the period 980-990 but they never entered mass production.
The electricity-producing windmills took over.
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