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5.7 m and a 9 m lattice tower. The windmill was of the upwind
type with a wind vane. The water brake and storage tank were
at the bottom of the tower, connected to the turbine hub with a
transmission shaft. Power limit was achieved by changing the
water brake characteristics, which then stalled the blades.
Experiments and measurements were conducted on the
turbine and the tip-speed ratio was estimated to be 3.5 to 4 times
the velocity of the wind. The windmill is documented in the report
“Exploiting wind power of high wind speed for house heating
city water brake with variable load in Iceland” from University of
Island.
Figure 13.8
Water brake windmill developed by Ørn Helgason (left);
water brake with variable load system (right) (Images: Ørn
Helgason
3
).
13.2.8
Gerlev
In 98, Gerlev Sports Folk High School built a water brake
windmill for heating. The designer was Jørgen Krogsgaard. It was
a downwind rotor with a diameter of m. The blades were made
3
Helgason, Ø., Sigurdson, A. S
. Test at very high wind speed of a windmill controlled
by a waterbrake
, Science Institute, University of Iceland.
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