> > Cor wrote: The laws of energy conservation are simple, in order to extract energy > you have to take it somewhere. > > No matter that the road already flexes, to take additional energy you > will need to either allow it to flex more >
That simply isn't true. The road is currently flexing and that energy is currently being wasted because it is not being captured. The correct application of this technology would simply capture the energy of the exiting road flex. In the end result, the road would neither flex more nor less. Ideally, the road would flex less and the reduction in rolling resistance would be an added benefit. > Most setups with piezo elements that I have seen, do not have elements > inside the surface, > they are not capturing energy from the flexing of the surface, but > instead they are mounted *under* the road, > Our were mounted on the side of the material. The piezo element was distorted with the existing material and had no measurable impact. > If you truly want to embed piezo elements in the surface of the road and > want them to flex, you will probably need to make the road > flex a bit more than today's costly concrete (stiff) freeway surfaces. > That adds losses to the movement, just like riding on sand takes more > energy > While people tend to think of concrete as stiff, it still flexes due to weight. If it didn't they wouldn't add steel to reinforce it. If concrete didn't flex there would be no advantage to adding steel. Just recently I was driving down the highway and saw huge concrete road beams being transported. The cast shape of these was in a gentle arc. That arc goes away when the road is build due to the loads. It takes a LOT of energy to flex those beams to be straight! And there's no 'sinking into' those beams. but it will sure remove energy from the vehicles passing (lower MPG) in > order to generate power, Cor, I completely understand what you are saying but your approach is only one of many possible ways to implement this technology. It also represents one of the worst ways, as you clearly point out. > there is no free lunch It's not free, it's simply recovering energy that is currently wasted because it is not being recovered. > unless you are able to > design a road in such a way that you can reduce the losses in the road > itself and "steal" power from the road, rather than from the cars. > > But due to the fact that roads do not seem to heat up a lot from > traffic, there is probably more much loss in the road that you can > capture. I am confused how anyone cannot be aware that roads heat up due to traffic. Here in Dallas Texas we have days that are just below freezing. On those days, the well traveled roads are clear because the precipitation melts. The less traveled roads stay frozen until the temperature rises or more traffic travels on them. This is a clear indication that roads heat up due to traffic. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160826/2fd39052/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
