Basic Physics: you never get energy for free, so the energy to charge the vehicle must come from the people. If you are extracting extra energy, that means that pedestrians need to deliver more energy, for example by tiles that change position (altitude) while standing on them, so the pedestrians need to "climb" from the tile after stepping on it. The effect can be minimal, but there needs to be some "path" traveled to generate work, else no energy can be generated. So, instead of a flat sidewalk, pedestrians will get the idea that they are walking uphill to walk across these tiles. This also means that they are not good for all types of pedestrians and (foot) traffic. I expect that the feeling of walking over these is similar to the "dragging" feeling that you get when walking over the rubber tiles surrounding children play structures.
Physics of Potential energy: m*g*h (mass x gravitation x height) Presuming that the efficiency of the generator is more than 50%, I estimate that the depression of the tile in order to generate the quoted 7 Joule is about 1/2 inch for an avg person. So, the feeling is that you step on the tile, it sinks and the next step you do is 1/2 inch up and that process continues as long as you walk on these tiles. Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of brucedp5 via EV Sent: Tuesday, June 23, 2015 4:46 AM To: ev@lists.evdl.org Subject: [EVDL] EVLN: pavegen.com tiles charge EV from human foot traffic (v) http://www.autoevolution.com/news/can-you-charge-a-tesla-model-s-through-footsteps-apparently-yes-video-96736.html Can You Charge a Tesla Model S Through Footsteps? Apparently, Yes - Video by Tudor Rus 16th June 2015 [image http://s1.cdn.autoevolution.com/images/news/can-you-charge-a-tesla-model-s-via-footsteps-apparently-yes-video-96736_1.jpg video https://www.youtube.com/watch?v=KPS-z6_pjDI People Powered Tesla Pavegen Jun 9, 2015 Pavegen generates energy from footsteps, each time someone walks over the tile up to 7 watts (7 Joules) of energy is generated. We used our Pavegen technology to harness the footfall of a busy street to charge a Tesla car battery, creating an off grid energy harvesting solution! Taking into consideration a number of footfall assumptions and the EPA rate for a Tesla at 382 Watt Hours per Mile. The system works and the Pavegen tiles were used to charge the vehicle however several hundred thousand steps are required to allow the vehicle to drive for 20 minutes on London's Streets. If the footsteps were used from one of London's busiest shopping locations: Oxford Street, enough energy would be generated from a day of people walking to drive a car 953 miles. All the way from London to Barcelona and further! Pavegen are currently raising investment on Crowdcube, you can invest as little as £10. See link here: https://www.crowdcube.com/investment/pavegen-19189 #investaware ] Everybody just stop what you are doing right now and hear us out. No, in fact, please start walking more because your footsteps will help charge EVs in the future. And not just any EVs, we're referring to Tesla's Model S sedan. That is, if Pavegen proves a successful product. Too many variables, right? Well, let's take one thing at a time and shake off the confusion. First in line, the gimmicks behind Pavegen tiles. Pavegen is a 'clean tech' company established in London, UK. They develop and manufacture flooring technology that converts the wasted kinetic energy from footsteps into renewable electricity. That being said, it's worth noting the company believes their product can change future smart cities by providing a low-carbon energy contribution. But we're interested in how will this apply to EV charging methods, so we'll focus on a recent video posted by Pavegen on YouTube. The whole clip is an experiment trying to see if people walking on a busy street can charge the battery of a Tesla Model S by taking into consideration a number of 'footfall assumptions' and the EPA rate for a Tesla, set at 382 Watt-hours per Mile. According to the video's description, the system works. However, several hundred thousand steps are required to allow the vehicle to drive for 20 minutes on London's streets, considering each Pavegen tile generates up to 7 watts at 12 volts DC whenever someone walks on it. Lastly, the company's conclusion was that "if the footsteps were used from one of London's busiest shopping locations: Oxford Street, enough energy would be generated from a day of people walking to drive a car 953 miles". 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His statement, posted on Twitter, ... http://masterherald.com/select-tesla-model-s-owners-to-test-hands-free-driving-by-the-end-of-the-month-reveals-elon-musk/19049/ Select Tesla-S Owners Testing Hands-Free Driving> sez CEO http://cleantechnica.com/2015/06/16/three-oddball-tesla-patents/ 3 Odd Tesla Patents> dual-pack,amphibians,anti-whiplash airbags http://auburnpub.com/skaneateles/news/power-move-mirbeau-inn-spa-in-skaneateles-installs-electric-vehicle/article_c24562c9-5abb-50d3-921b-630db7f595aa.html L2 & MPWC EVSE @mirbeau.com Skaneateles-NY + EVLN: Tesla3 project includes sedan and crossover variants r:250mi {brucedp.150m.com} -- View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-pavegen-com-tiles-charge-EV-from-human-foot-traffic-v-tp4676434.html Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
