Experimental VAWT
By dirk65, Section Wind Posted on Thu Sep 20th, 2007 at 11:41:45 AM MST
I may try to make one like this

Hi there, I'm new here and have been reading a lot. Recently I came across a new style of VAWT which looks promising for urban use. Has anyone else seen this before? Greetings from Belgium

Experimental VAWT | 4 comments (4 topical, 0 editorial)

Re: Experimental VAWT (3.00 / 0) (#1) by wdyasq on Thu Sep 20th, 2007 at 05:55:16 AM MST (User Info)

I think that shows a 7m X 5m obstruction - about the same area as a 7m HAWT. From an online calculator: 188100.0 watts possible from 22.0 ft dia prop (380.0 sq ft) in 46 mph wind (density of 1.225000) 30096.0 watts output assuming generator is 80% efficient and Cp of 0.20 so - good luck ... Ron Adventure is just bad planning." -- Roald Amundsen

Re: Experimental VAWT (3.00 / 0) (#2) by clflyguy (sidney.raiford@gmail.com) on Thu Sep 20th, 2007 at 06:00:08 AM MST (User Info)

Hmmmmmm... That looks sort of familiar

Re: Experimental VAWT (3.00 / 0) (#3) by feral air on Thu Sep 20th, 2007 at 07:22:08 AM MST (User Info)

...and rather complicated for a vawt. [ Parent ]

Re: Experimental VAWT (3.00 / 0) (#4) by Ungrounded Lightning Rod on Thu Sep 20th, 2007 at 07:41:03 PM MST (User Info)

They're using the rotating shroud to get rid of the losses on the upwind-moving side of the basic rotor. If they get things balanced right it should get closer to Betz than a bare rotor, perhaps catching up with or even beating a HAWT of the same size.  They don't lose power to angular momentum left in the downwind stream.  But with a single-direction rotor and housing they have to get the wind to exert a standing torque on the housing to angular-momentum balance the torque on the rotor shaft, and that will probably produce drag.  They could compensate by stacking two rotors working in opposite directions with the shrouds tied together.  But then they'd need two alternators or gearing. If they don't get things balanced right it won't face the wind.  B-) [ Parent ]

Login

Make a new account Username: Password:

Total Views

167 Scoop users have viewed this posting.

Related Links

· Also by dirk65