You wrote: > I have often seen calls for a popularization of small wind, but this seems > to be more a question of development of small turbines for urban and > sub-urban siting. To bring clarity in this question, a debate and > discussion is needed. I have done the following article, > > Plug-’n Wind turbine, a development specification. > http://energy.saving.nu/plugin/windturbine.shtml > > as an attempt to get a discussion started. > > Hakan
Hi Hakan, I'm a bit puzzled. Is there a Darrieus Horizontal Axis Wind Turbine (DhAWT) as mentioned below, "We end up with two possible and logical designs for our urban wind turbine, either the DHAWT or the PHAWT." and "The characteristics of the DHAWT make it very suitable to work in..." http://energy.saving.nu/plugin/windturbine.shtml I read long ago the Darrieus Vertical Axis Wind Turbine's (DVAWT) needed startup assistance in low velocity winds using some sort of Savonius Vertical Axis Wind Turbine (SVAWT), also known for its torque, to start the DVAWT -or- some sort of electric motor circuit for startup during low speed winds but things could very well have changed. I'd read picoturbine.com which says -- PART 3: Technical Notes Vertical Axis Wind Turbine (VAWT) ö Drag based This design is used in the PicoTurbine project. Specifically, the design is called the Savonius turbine, after itâs inventor, S. I. Savonius. It was invented in the 1920âs. It uses drag, like a cup anemometer, to produce torque. Because it is horizontal there is no need to have a mechanism to keep it turned into the wind. Disadvantage - Lower efficiency. Estimates range from 15% to 24% efficient as compared to 40% for other designs. From -- Latest PicoTurbine Plans, Revision 1.1B, Adobe PDF Format (size: 907 kilobytes) picoturbine.com/pt001-plan11B.pdf One thought mentioned at PicoTurbine is the possibility of increasing power output by designing it to use more magnets to compromise for the lower wind gathering efficiencies as speed increases but taking advantage of its higher torque capabilities if I understood it correctly. There maybe some interest in the Technical Notes included in the various plans http://www.picoturbine.com/projectlist.htm Savonius rotor designs http://www.angelfire.com/ak/egel/savonius.html 1) very strong due to the central shaft, but slightly less efficient 2) slightly more efficient 3) the most efficient > > 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/
