10089_001.pdf - Load set calculation - ECN
10089_001.pdf - Load set calculation - ECN
10089_001.pdf - Load set calculation - ECN
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<strong>Load</strong> <strong>set</strong> <strong>calculation</strong> DOWEC 6MW H. Efdé<br />
5.5 Tapered blade.<br />
<strong>ECN</strong> has designed a blade with more taper than the baseline blade, ref [12]. The cone angle is<br />
changed to –2.4 o . The input file “DowecR6.inp” is revised to reflect the new blade design. The<br />
turbine control is the same as the baseline. The results of the load case <strong>calculation</strong>s can be found on<br />
CD C45.04/01.03/03. The extreme and fatigue tables can be found in Appendix G as well.<br />
5.5.1 Cost of energy.<br />
The blade- and tower parameters and the annual production are taken into account for the<br />
<strong>calculation</strong> of the cost of energy. The average gearbox torque is similar to the baseline. It does not<br />
have an effect on the cost of energy. The results are presented in the table below.<br />
Table 17, Tapered blade, cost of energy.<br />
Tapered relative<br />
parameter baseline blade turbine costs<br />
blade kNm % %<br />
Myb[1]-p[01] 18006.00 -2.69 -0.04<br />
1Hz-Mxb[2]-p[01] 6740.51 -0.24 0.00<br />
tower<br />
Myt[01] -281560.00 -2.21 -0.11<br />
1Hz-Myt[02] 6372.64 -1.00 -0.03<br />
total -0.18<br />
annual production baseline<br />
Tapered<br />
blade change (%)<br />
Gwh 25.4014 25.394 -0.03<br />
Tapered blade, change in cost of energy - 0.15<br />
R45.04/01.03/03 Stentec, 3-1-03 page 20
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