I still don't get it. Even if the technology works, the energy comes
from the car.
So, let's say our EV takes 250wh / mile from the battery at 50 mph on
normal roadway. Now, with the piezo roadway, it takes 251wh / mile. But
there are some losses converting that piezo compression to electricity
so, by the time it reaches the grid let's say it's 80% of that or 0.8wh.
Later, we need to recharge our EV and let's say that process is also 80%
efficient. So to get that extra 1wh into the battery takes about 1.2wh.
So the net is it took 1.2wh to get 0.8wh of electricity. Wouldn't it be
better just to stick with the normal roadway?
My numbers are just for example. If I have a flaw in the logic, please
point it out.
Peri
------ Original Message ------
From: "Michael Ross via EV" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: 27-Aug-16 3:51:27 PM
Subject: Re: [EVDL] Piezo-power> 10mi of freeway could charge all the
EVs inBurbank-CA(?)
Maybe in SoCal the roads never get messed up because the weather is
so
nice?
Here in NC our weather swings between -12°C and 40°C, and we get decent
rainfall all year, I think of potholes, and nasty dropped pieces of car
and
truck parts, ladders and lumber, sagging shoulders, bermudagrass
infiltrating the pavement, etc., on one hand. And the uncountable
millions
of wires to collect these electrons? Now buried just below the surface
of a
roadway. This is going to last how long before it degrades and has to
be
repaired, and what does that take?
Even if it can be done, I doubt the real world, scaled up application
works
well. I am very doubtful.
Maybe someone will devise a fabric that contains piezo elements and
conductors, by some very automated, continuous process. There was a
project
at NC State to make pipe insulation by some sort of non-woven textile
process that had thermocouples (a thermopile of them) in it that would
make
power from the temperature gradient between the inner and outer
surfaces.
It looked like a real trick to get the current out of it (resistance),
and
how to connect to it, service it, and change/repair it when damaged.
This roadway/power plant is kind of like combining solar PV and solar
thermal in the same collector - yeah you can do it but the complication
is
much greater and all you really get is PV running a little cooler, with
better efficiency, if you actually use the thermal to do that. You are
far
better off having separate collectors on for moving electrons and the
other
for moving heat. The complication of putting them together negates the
added efficiency. You are far better off having a well built, simple,
durable road, and a solar farm beside it.
I prefer to see some of the real estate beside and in the medians of
roadways used for PV.
--
To invent, you need a good imagination and a pile of junk.
Thomas A. Edison
<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html>
A public-opinion poll is no substitute for thought.
*Warren Buffet*
Michael E. Ross
(919) 585-6737 Land
(919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Mobile
and
Google Phone
[email protected]
<[email protected]>
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