Hoagy,
Thanks, it was very interesting and I missed it. Need to check it, but if it is right it is quite a big thing. All literature I looked at, set the Savonius at 14%, but also the American Multiblade at 14%. Will be interesting to explore. LOL He is right, it will take decades to correct. Hakan At 19:03 08/01/2004, you wrote: > > you wrote: > > > > Hoagy, > > > > Looked at, > > > > "Wind Energy Systems" > > <http://www.eece.ksu.edu/~gjohnson/>http://www.eece.ksu.edu/~gjohnson/ > > > > Liked it as a basic text book, but it seems a bit old on newer development. > > Well worth to read. > > > > Hakan > > >Thanks Hakan. The basics are what I need to understand. >He does talk about the Darrieus VAWT quiet allot it seems. > >I was reading Chapter One - Introduction and he went >through some historical highlights. One of them was >about the Savonius Vertical Axis Wind Turbine regarding >its Cp (power Coefficient) or efficiency. He writes in >section 5 Innovative Wind Turbines page 1-17 -- > >"A chart of efficiency of five different turbine types is >shown in Fig. 8. The efficiency or power coefficient varies >with the ratio of blade tip speed to wind speed, with the >peak value being the number quoted for a comparison of >turbines. This will be discussed in more detail in Chapter 4. >It may be noticed that the peak efficiencies of the two bladed >propeller, the Darrieus, and the Savonius are all above 30%, >while the American Multiblade and the Dutch windmills peak at >about 15%. These efficiencies indicate that the American >Multiblade is not competitive for generating electricity, even >though it is almost ideally suited and very competitive for >pumping water. > >The efficiency curves for the Savonius and the American >Multiblade have been known for a long time [6, 10]. >Unfortunately, the labels on the two curves were accidentally >interchanged in some key publication in recent years, with the >result that many authors have used an erroneous set of curves >in their writing. This historical accident will probably take >years to correct." > > >It appears the DVAWT & the SVAWT or some variation >could provide suitable options for the VW-turbine idea >at least in terms of efficiency. Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/index.php?list=biofuel Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/biofuel/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
