http://www.altran.com/hub-press/press-r ... uture.html
![Image](http://blog.altran.es/wp-content/uploads/2013/01/imagen3.jpg)
This made me think about the wind turbines, this is something I´ve been thinking about many times.... is a wind turbine worth? or the added drag is not worth the energy generated?
![Question :?:](./images/smilies/icon_question.gif)
Are you sure about this? Agree with the rest of your post, but not sure about thistomislavp4 wrote:The energy generated by the turbines will be less then the energy needed to overcome their drag.
Andres125sx wrote:Are you sure about this? Agree with the rest of your post, but not sure about thistomislavp4 wrote:The energy generated by the turbines will be less then the energy needed to overcome their drag.
I think it must be a factor of speed, under 100km/h drag is not a big issue, and this car is limited to 80km/h, so I´m not that sure. For higher speeds I´m almost sure that will be true, but at lower speeds...
What energy is needed to overcome that increased drag at 60km/h? Without any knonledge at the respect, I´d say very little, but a wind turbine, even this small, spinning with a wind of 60km/h can generate some energy.... question is if more or less than the needed to overcome that drag
As I say I don´t have technical knownledge at the respect, but intuitively I´d say at low speeds it may be worth
Andres125sx wrote:Are you sure about this? Agree with the rest of your post, but not sure about thistomislavp4 wrote:The energy generated by the turbines will be less then the energy needed to overcome their drag.
I think it must be a factor of speed, under 100km/h drag is not a big issue, and this car is limited to 80km/h, so I´m not that sure. For higher speeds I´m almost sure that will be true, but at lower speeds...
You´re assuming you´re moving the car to create wind and use that wind to generate energy, and that´s wrong. The car is moving anycase, and it weights around a ton, that´s what is determining the power requirements, not the wind turbinexxChrisxx wrote:Wind turbines work because they are static, and the wind passes over them. The energy is provided by the wind. When you are 'creating' the wind by pushing the turbine through the air. You are providing the power to do this.
And as we all know from the laws of thermodynamics, you can't get out more than you put in. So an exposed turbine will always be less efficient than not having it at all. The laws of physics apply at all speeds.
From the OP:Cold Fussion wrote:Instead asking for analysis of why it wouldn't work, why don't you provide some analysis as to why it would work.
Maybe I was wrong expecting something more technical than a mocking picture from a technical forum....Andres125sx wrote: is a wind turbine worth? or the added drag is not worth the energy generated?
So no engineers involved on a car development, bold statement if you ask me...flynfrog wrote:There are no engineers involved with that car there are some industrial design students and a marketing guy. Maybe some guy to throw together some cad models to make pretty pictures with.
You´re not moving a wind turbine, you´re moving a car wich has lots of drag and inertia with or without a wind turbine, maybe the added drag of a wind turbine is negligible because you need a lot of power to move the car anycaseAndres125sx wrote:You´re assuming you´re moving the car to create wind and use that wind to generate energy, and that´s wrong. The car is moving anycase, and it weights around a ton, that´s what is determining the power requirements, not the wind turbine. The added drag of a small wind turbine will change the power needs almost nothing
Wrong startflynfrog wrote:Thermodynamics says we can't get out more than we put in. So lets create a car out of magic that has zero drag.
Maybe try graduating high school physics before continuing the discussion then? This is day one stuff mate. Even if the car zero drag the wind turbine will not provide more power than it takes to drive it along.Andres125sx wrote:Wrong startflynfrog wrote:Thermodynamics says we can't get out more than we put in. So lets create a car out of magic that has zero drag.
Cars have drag, that´s the main point. Since cars have drag and weight, you need some energy to move it, and it´s not negligible, you need a good amount to move a car. There my doubt, since you need a good amount of energy to move the car.... does the little drag of the wind turbine really change the power demand?
Considering it´s limited to 80km/h I guess drag will probably be the less important factor to move the car, it´s the weight what determines how much power you need to move it, so maybe (and that´s my question) even with the turbine it still is weight what determines how much power you need to move it and it does not change with or without turbine
Remember it´s a city car, it will not travel at constant speed for too long, it will be accelerating and braking constantly, so maybe that drag is negligible
Thanks for trying anycase