Environmental Engineering Reference
In-Depth Information
13.2.5
The Svaneborg Windmill
In 98, in Stagstrup, two brothers Hans and Bent Svaneborg
each built their own windmill. Hans built a water brake windmill
and Bent a wind turbine with a generator for electricity
production. The water brake windmill was a downwind type,
with a 7 m tube tower held up by four wires, rotor diameter
of 7.5 m and three fibreglass blades. For the transmission in the
nacelle a Mercedes small truck rear shaft was used. From the top
of the wind turbine there was a shaft down to the bottom of
the tower where the water brake was installed.
At 9 m/s wind speed, a power limitation was applied by
using a simple mechanical pitch regulation; the windmill changed
from running with a constant tip-speed ratio to a constant tip
speed and hence to a constant rotation speed.
The water brake was of the same type, as used at the
Institute of Agricultural Engineering. The turbine operated for 4
years until it was taken down for revision. Folkecenter conducted
measurements that showed a surprisingly high efficiency and
an output of 8 kW. Hans Svaneborg's windmill for heating can
be found in the collection of historical turbines at the Folkecenter.
Figure 13.6
The Svaneborg water brake windmill.
13.2.6
LO-FA Heat-Producing Windmill
In 980, Knud Berthou from Sakskøbing built a heat-producing
windmill LO-FA. It was a 3-bladed turbine with wooden blades,
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