On 29 Mar 2016 at 19:17, Michael Ross via EV wrote: > I don't see why scavenging heat has to increase rolling resistance.
Here's the relevant passage from the original article: > Additionally, pressure from tire deformation that occurs on the road > translates into electricity through the use of a piezo-electric > material within the tires. This is separate from the energy supposedly gained by reclaiming the waste heat. It's generated by piezo elements. These are crystalline junctions, Rochelle salt for example, which generate a small amount of electricity when they're twisted. Piezo elements were once commonly used in phonograph cartridges for low cost record players because they could produce enough voltage (a volt or two, IIRC) to drive a power amplifier. They didn't need the preamplifier that a magnetic cartridge required. In fact as a kid I owned a one-tube child's phono. It had a high-output crystal cartridge directly driving a 25L6 power beam pentode used as a triode. The main point is that because of inefficiencies, any mechanical generator will require more energy input than it produces for output. Basic physics says that a piezo generator in a tire (which seems pretty pie in the sky to me already) HAS to increase rolling resistance. On 29 Mar 2016 at 15:30, Cor van de Water via EV wrote: > I guess the news got out 2 days early. I think you've nailed it. :-) David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ 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)
