Environmental Engineering Reference
In-Depth Information
solutions that are in many ways related to the early eforts of
developing MW-size wind turbines as well. The main issues of this
development can be divided in following stages:
(1)
Juul's heritage:
Johannes Juul's design leads to Christian
Riisager's wind turbine
(2)
The national wind power versus Tvind's bottom-up
programme:
Tvind transfers Hütter's blade technology to
Denmark
(3)
From NIVE to master blacksmiths: The follow-up on La
Cour's tradition:
NIVE and the blacksmiths pave the way
for the component wind turbine combining Juul's design
and Tvind/Hütter's blade technology
(4)
Blades are the core of it all:
The importance and growth of
the independent blade supply industry
(5)
The windmill industry goes international:
Wind turbine
development of large corporations versus small enterprises
7.8
Juul's Heritage
The person, who paved the way for our modern 3-bladed windmills,
was Johannes Juul (1887-1969), sectional engineer at the SEAS
local power utility in Haslev. In 1951 he initiated a full-scale
experiment with an 11 kW 2-bladed windmill. It was named after
its location, Vester Egesborg. Juul harvested his early experiences
from this windmill. One blade broke of, which made him conclude
that it would be good to go from two to three blades, as it would
thus give them the necessary strength.
As early as 1953, his first test set was working, and the 3-bladed
windmill had come into the world, the type that became industrial
standard and made wind power a realistic and economical form
of energy. It is still striding victoriously all over the world: three
blades placed in front of the tower, stall regulation, asynchronous
generator linked directly to the grid and active yaw. They are the
most important code words to characterise Juul's concept, on
which innumerable variants have been embroidered, just as it has
happened with other historical technological breakthroughs.
The F. L. Smidth & Co.'s Aeromotor from the early 1940s,
installed on the island of Bogø, was later reconstructed by Juul. In
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