New Jersey Turnpike As a Power Source? 264
New Jersites writes "New Jersey, home of the eponymous Jersey barrier, is considering wind turbines powered by the breeze generated from traffic on the Jersey Turnpike. The wind turbines won't be built on the side of the highway. They will be built inside — what else? — the Jersey barriers. By replacing sections of solid concrete with Darius turbines, they might be able to harvest enough energy to power a light-rail line."
Drag? (Score:5, Insightful)
I'm not a physicist, but won't the turbines cause a drag effect on the cars, resulting in the cars burning more fuel? Is so, aren't they just moving the problem from one place to another? There's no such thing as free energy, right?
Truly curious - I'd love an explanation if someone knows why this isn't the case.
The barriers are supposed to be solid. (Score:4, Insightful)
People can fly? (Score:3, Insightful)
Re:Drag? (Score:5, Insightful)
You've got it right. The turbines would take energy from the air being pushed around by the cars, leading to the breeze around the car slowing down, and therefore exerting more drag on the car.
At the same time, this is a rather ingenious way of creating a virtual toll for roads. If the power gathered is then invested into a public transport system, then you'll end up having drivers subsidise public transport. The fuel savings with public transport may well offset the extra fuel burnt through the turbine induced drag.
Re:Drag? (Score:3, Insightful)
Re:Drag? (Score:3, Insightful)
That's a great point I never would have thought of.
I'd be shocked if the energy extracted from burning extra fuel in cars on a freeway would come close to what you'd get by burning the same fuel in a properly designed power plant (and I'm quite confident that the emissions would be worse).
Bad Idea (TM) is my guess. (Score:1, Insightful)
(I am an art student not a physicist)
But, as I recall, Internal Combustion is a notoriously inefficient method compared to other forms of energy generation. Generally, we would want to offload any energy production from low efficiency models to high efficiency models. Assuming the ICE is a very low efficiency method, we would want to harvest the least amount of energy through it as possible. A better solution, rather than putting more strain on the ICEs in the cars of today, would be to make cars vastly more efficient in the drive train and any other place where energy is transfered and used, while harvesting electricity for other purposes from greatly more efficient sources.
So my guess is even if you could do it, you wouldn't want to.
Re:Why's the train not running? (Score:1, Insightful)
Re:Drag? (Score:4, Insightful)
The wind in the (been-shot-down-before) turnpike story is a draft caused by the cars' motion, and benefits their efficiency because it acts like a slight tailwind for each vehicle. Eliminating that tailwind would have a large energy cost, compared to the minor harvest from the turbines.
Re:Drag? (Score:2, Insightful)
Re:Drag? (Score:3, Insightful)
There's no such thing as free energy, right?
Indeed! There is, however, such a thing as wasted energy.
Something similar in London? (Score:2, Insightful)
My first thought on seeing a picture of the NJ turbines was that they would have to be increasing the fuel consumption of passing cars, if only marginally. Perhaps they could be placed where people should be slowing down, e.g. off ramps and junctions, to actually slow the cars a little. I had a thought ages ago that junctions should be on raised ground so that cars are naturally slowed as they approach uphill and gain easier acceleration as they leave downhill.
One word for why it will be an economic failure... (Score:1, Insightful)
Re:A far better idea than sapping cars' energy (Score:2, Insightful)
Furthermore, what obligates one to silence one's voice just because people are listening? There are millions of blowhard assholes loudly voicing their uninformed opinions in roadhouse bars every night of the week, and no one ever tells them their point of view is invalid due to their lack of academic or professional credentials. But every time Sean Penn opens his mouth it's all "You're just an actor, what do you know?" Those same critics would never say "You're just a steelworker, what do you know?" Ironically, this is the very Harrison-Bergeron-esque promotion of mediocrity that said critics fervently believe themselves to be in opposition to.
P.S. I think Lewis Black is hilarious, even when he's off-base.
Re:Drag? (Score:3, Insightful)
I imagine if they slso harvested all that exhaust heat from passing cars and friction dumped into the road from the rotating tyres, you could tap that heat differential with a closed gas heat exchanger perhaps running a Stirling engine.
The energy is being dumped anyway, might as well recover what we can. Reduce, re-use, regenerate...
Re:Drag? (Score:3, Insightful)
In addition, yes, this will create some degree of drag on the cars, and in essence, they are using gasoline to produce electricity in about the most inefficient way possible. Considering oil is already becoming scarce and is not renewable, they should not do this.
Re:Drag? (Score:2, Insightful)
Have you seen that "systems analysis"? (Score:3, Insightful)
Have you seen that particular "systems analysis"? I have. It's so blatantly flawed that the flaws are almost certainly intentional.
Re:Drag? (Score:3, Insightful)
>another? There's no such thing as free energy, right?
No it wouldn't cause drag on the cars
the cars are already pushing a wall of air, ATM that wall of air just dissipates after a while, the barrier would take that wall of air and convert it to some power
So in fact, its actually making the cars more efficient, as the wasted energy that is normally lost through drag is being utilised now
Re:Drag? (Score:4, Insightful)
It's a really stupid idea.
Re:Drag? (Score:3, Insightful)
Re:Drag? (Score:2, Insightful)
Whether you are there or not, the wake exists, normally it just dissipates around the car - wasted energy
If they put these by the side of the road that energy can be utilised, how is that going to cause drag, your already pushing the air around you, the drag is already happening, their just using that to make energy
I don't see this causing additional drag at all
Lets compare this to solar energy, the light hits the ground, that energy is wasted, put a solar panel in the way and you generate power, but there are no more solar rays to do this, your just harnessing otherwise wasted energy
Though i believe that it would make more sense to put up some solar panels, rather then spend all this money on roadworks and stuff to harness the air that's being pushed by a car
Cost (Score:2, Insightful)