Environmental Engineering Reference
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Figure 27: MHM - 10-turbine analysis compared to industry study set.
Figure 28: Geared and DD - 10-turbine analysis compared to industry study set.
Figure 28 plots a subset of the industry data presented in Fig. 27 for MHs that
employ either a gearbox or DD. The mass of today's DD generator technology is
nearly as much as the mass of a gearbox and high-speed generator combined.
While it appears the DD technology has a slight mass advantage over the geared
turbines, it is not signifi cant for large machines. It should be possible for a 10 MW
MH (that would otherwise be 330
270 tonne range
or better for new low-speed generator breakthroughs. It may also require some
370 tonnes) to be in the 230
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