sin αst

CONCEPTUALISATION
30
ID Requirement
3 Ability to manufacture the wind turbine locally using
standard operations
HAWT
Cyclo.
3 3 4 1
4 Flexibility in choice of blade materials 4 3 4 a 1
5 Low manufacturing tolerance demands 3 3 4 2
6 Low-cost materials and parts 3 3 4 2
8 Ability to perform localised maintenance 3 3 3 3
9 Low maintenance requirements and high life expectancy 4 1 3 b 3
10 Flexibility for reconfiguration with different components 4 4 4 3
24 20 26 15
a) The flexibility in choice of materials is less than that of the HAWT, but it is not considered as a disadvan-
tage due to the simplicity of the Savonius structure and due to the availability of e.g. oil barrels.
b) Due to the pulsating loads it is presumed that the Savonius is more prone to fatigue issues than the
HAWT.
Table 4.2: Decision-matrix with evaluation criteria and their rating for each wind turbine
concept
The following two-dimensional radar charts below provides an illustrative overview of the
multivariable data of table 4.2.
Figure 4.16: Graphical representation of the decision-matrix results
Savonius
Helical