Wind policy

Renewable energies except solar electric or thermal (seeforums dedicated below): wind turbines, energy from the sea, hydraulic and hydroelectricity, biomass, biogas, deep geothermal energy ...
Christophe
Moderator
Moderator
posts: 79117
Registration: 10/02/03, 14:06
Location: Greenhouse planet
x 10972




by Christophe » 10/06/03, 20:00

Mr François Carré has shown and demonstrated that the recoverable power (potentiality) of the wind is proportional to the square of its speed. The energy recoverable by wind turbines cannot therefore behave according to the cube of the wind speed as is commonly accepted.

The results ?

Less power in strong winds you tell me! Yes you would be right! But the essential question is: how long do "current" wind turbines run at their nominal power? (the answer: 15 to 25% of the time ...)

Much more energy would be recovered (over a given period) by multi-blade wind turbines designed for the exploitation of low winds. These wind turbines do not require heavy investment.

The work of Mr Carré is remarkable and yet ignored by wind turbine builders looking for increasingly gigantic projects.

http://ees.phpnet.org/eoliennes.htm
0 x
Christophe
Moderator
Moderator
posts: 79117
Registration: 10/02/03, 14:06
Location: Greenhouse planet
x 10972




by Christophe » 23/07/03, 13:47

Dear Sir,

I just sent you an email to shed some light on this "case";)
0 x
pacha
I discovered econologic
I discovered econologic
posts: 1
Registration: 05/03/04, 18:16




by pacha » 05/03/04, 19:42

I would like to present a wind turbine with a vertical axis which is still entirely unknown and which has many advantages (although it is a little more complex than the DARRIEUS, which is related to it); because the blades can be oriented during operation by a very simple mechanical device (however less complex than that of propeller blades).
It is nothing other than a ROTOR LIPP, a new ship propellant which is still very little known, but is currently being studied by ENSTA, the NAVAL SCHOOL and the ARTS AND TRADES (see Google; Instationary Propulsion, without taking including an uninteresting electrified version presented by a stranger). The efficiency, recorded in the hull basin, is much higher than that of the propellers.
As a wind turbine, we can represent the movement of its blades as related to that of the wings of birds.
The air flow is not disturbed (they can therefore be closer to each other in "fields", especially when there are four blades). Whatever their orientations, the impact is the same on all their "lengthening".
This wind turbine can directly feed an alternative electrical network without disturbance.
In strong winds the incidences decrease until reaching the "flag" if necessary.
No study has yet been carried out on this device as a wind turbine "(which is not the case of the propellant, studied in the hull basin). I count a little on this forum to whet the interest of specialists, to the point of making them want to make the necessary calculations, which no one has yet done.
Captain LIPP yvette2@free.fr
0 x
State
I discovered econologic
I discovered econologic
posts: 8
Registration: 14/04/04, 03:42




by State » 14/04/04, 04:02

Hi everybody,

I am responsible BE of a company which manufactures and markets wind turbines with vertical axis intended to be established in urban environment ("statoeolien" of GUAL Industrie, site under construction, but explicit: www.gual-industrie.com). I have read the "strange" theories of Mr. Carré .... but I verify daily with calculations and experimental measurements the cubic law of the power carried by the wind. Unless the dimensional analysis, the basis of many physical principles, is called into question, I still do not understand how this power could follow a "square" law ....

Since I just arrived on the forum, I think I "missed" a few episodes, that's why it would be nice to explain to me in two words this theory which would question (if it turns out to be right ...) many things ... .in many areas ....

Thanks in advance....
0 x
Christophe
Moderator
Moderator
posts: 79117
Registration: 10/02/03, 14:06
Location: Greenhouse planet
x 10972




by Christophe » 15/04/04, 19:36

First here is Monsieur Carré's website, I don't know if you had read it before posting:
http://tleboucher.free.fr/fc/introduc.html

Then, working essentially empirically (I met him), I think that Mr. Carré simply "ignores" in his calculations (based on very real measurements ..) that the (aerodynamic) efficiency of the propeller also varies with the speed (rotation, wind ... and therefore callage ... or rather the reverse;)) which ultimately makes him "believe" that the global system (propeller + generator) has a yield varying according to the square of the wind speed.
The other argument that he puts forward is the "huge" power which should supposedly be recovered from the "classic" wind turbines working on strong winds .... again, the aero efficiency of the propeller degrades this power. ..
Here is my opinion.

On the other hand, where he is entirely right is on the use of low speed winds, which would make it possible to recover much more energy (and not power ..) than strong winds (see distribution curves of the winds on his site) ... what ends up on small wind turbines has "affordable" costs for ordinary people ...
0 x
CURUTCHET
I discovered econologic
I discovered econologic
posts: 1
Registration: 05/12/12, 09:52

The world's first Lipp-type wind turbine




by CURUTCHET » 10/12/12, 17:12

Hello,

Regarding the Lipp rotor, a young French design office succeeded in developing the first wind turbine in the world based on the principle of the Lipp rotor. To watch the video:

http://www.youtube.com/watch?v=ly_5QKRcG2c

Sincerely,

AC
0 x
Ahmed
Econologue expert
Econologue expert
posts: 12298
Registration: 25/02/08, 18:54
Location: Burgundy
x 2963




by Ahmed » 10/12/12, 21:55

Intense suspense! Who will prevail, the theory of Francois Carré or that ofErnest cube? :P
0 x
"Please don't believe what I'm telling you."

 


  • Similar topics
    Replies
    views
    Last message

Back to "hydraulic, wind, geothermal, marine energy, biogas ..."

Who is online ?

Users browsing this forum : No registered users and 265 guests