Tire design, like any design involves many tradeoffs. The most efficient tire will be very thin and flexible with little carcass or rubber, low frontal area is good. A small contact patch is good, but bad for traction forward, backwards or sidewise. This minimizes the squishing around of the rubber in the rolling tire as it approaches the contact patch, complies with the road, and the unfolds to its natural inflated state. The rubber literally heats itself as the molecules slide by each other, unraveling and springing back, over, and over, again. The best tire in the terms of waste heat won't be very durable.
The problem is, this sort of tire is not good for heavy vehicles, not bad for a human powered vehicle. (I get 3000 to 5000 miles from a bike tire, and they cost a significant fraction of a compact car tire.) Anything you do to carry weight, improve traction and cornering, increase mileage until failure, etc., will degrade the efficiency by pulling the design away from the ideal. Simply adding tread thickness causes more rubber to experience flexing and heating. So "FIXING" the tire is not really a good goal for one or another design requirement. As if there was enough energy wasted as internal friction in the tire, you could try to capture it. It might even make the tire last a little longer, but maybe it won't have good traction on wintery, wet days. Go in one direction and the design is compromised in another. You could do what trains do and use steel tires. Anyway, it sounds like a fools errand, not because it is another perpetual motion scheme, but because there is really not that much to be gained from scavenging heat from an already pretty low temperature process. It is truly wasted energy and you can get some back, but it just isn't worth the effort. Take that development budget and donate it to the fusion energy research efforts. That waste heat is at a really high temperature and is thus incredibly useful. On Tue, Mar 29, 2016 at 7:24 PM, Robert Bruninga via EV <[email protected]> wrote: > > I don't see why scavenging heat has to increase rolling resistance. > > Ask yourself by what mechanism is the conversion of heat to electrons is > going to hold back the vehicle. > > It is because if there is heat in the tire, then there is WASTED energy. > > So the thing to do is FIX the tire so it is less losssy, and therefore > less heat, and therefore less to scavenge and more to use in rolling the > car in the first place. > > Bob, WB4aPR > > > > > > -----Original Message----- > > From: EV [mailto:[email protected]] On Behalf Of EVDL > > On 29 Mar 2016 at 3:15, brucedp5 via EV wrote: > > > > > Additionally, pressure from tire deformation that occurs on the road > > > translates into electricity through the use of a piezo-electric > > material > > > within the tires. > > > > Great, here we go again with another variant of the generator on the > > wheel fallacy. The added rolling resistance will more than offset the > > energy recovered. > > > > What's with these engineers? 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