Environmental Engineering Reference
In-Depth Information
13.2.2 Gunnar Broe and Værløse Group
Gunnar Broe was the main member of a group of experimenting
engineers from Værløse, active from around 970 onwards. The
group was developing wind-powered water pumps for developing
countries. They were made very simple and consisted of simple
parts that were produced in big numbers. Parts came from the
automobile industry, and were used or new components at a
reasonable price.
Broe developed a simple turbine with a three-bladed rotor.
The rotor diameter was 5 m and tower height was 8 m. The nacelle
was made of second hand car parts. The tower was bolted lattice.
The blades were upwind of the tower and were held up against the
wind by yaw blades.
The windmill was later converted into a heat-producing
windmill with an open water brake, based partly on results from
the experiments held at the Institute of Agricultural Engineering.
13.2.3
Windmill Group ECO-RA
The windmill group ECO-RA continued the development of Gunnar
Broe's ideas with water brake windmill experiments. The group
consisted of Gert Ottosen and Jørgen Krogsgaard. The prototype
wind turbine used parts from a car and the open water brake that
looked like the one from the Agricultural Technical Institute.
The entire windmill was of a very simple construction.
After taking some measurements and testing of the water brake
windmill, a design manual was created in 1976. It was very brief
with three pages of text and drawings, which was sold in 00
copies.
Then in 977, Jørgen Krogsgaard designed a much better water
brake windmill. It had three blades with the profile from the Gedser
wind turbine. The rotor diameter was 6 m. For the transmission in
the nacelle, second-hand car parts were used. The tower was a tube
held up by four wires. The blades were placed downwind. The power
was limited by mechanical pitch regulation. The speed of rotation
was variable, which gave a constant tip-speed ratio until the pitch
regulation set in and the tip speed was constant. The water brakes
were of the closed Culver-type and mounted in a special lattice
tower top in such a way that they were easily removable. A design
manual for the windmill was created and 0 copies were sold.
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