h a l f b a k e r yOn the one hand, true. On the other hand, bollocks.
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Peltier-seebeck effect allows thingies to be charged when
one side of the thingy is warmer than the other. I believe
there is many instances where this is true in cars. Hotter on
inside than outside or vice versa. the energy generated from
this effect could be used to further charge hybrid cars.
Exhaust Heat Recovery
http://www1.eere.en.../deer10_meisner.pdf
[bs0u0155, Sep 06 2016]
BMW Turbosteamer
https://en.wikipedi...g/wiki/Turbosteamer
[bs0u0155, Sep 06 2016]
[link]
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This is a baked idea <link>. For car exhausts there are a
few problems. There is certainly a decent heat gradient
from the exhaust gasses to the general environment. The
problem is the absolute temperatures are a bit nuts and
variable for your garden variety peltier, 1000-2000C
tends to count out most electronics. People have worked
around it but the increased weight, cost and complexity
usually obliterates any efficiency gains. BMW tried a
steam system to feed power back to the crank <link>.
From personal experience, anything exposed to the
elements and the heat cycling of an exhaust system will
break. Its a horrible environment. |
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... yet still somehow much more pleasant than Basingstoke. |
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Yes, what [bs] said - that sort of energy recovery is Baked and WKTE, generally on static or semi-static (marine) installations that run at more or less constant load. |
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Suppose the thingie* were attached to a large thermal mass,
to dampen out the temperature variations, via a better
insulator. The thingie then experiences steadier lower
temperature over a longer time period with a longer
operational life. |
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I just wasted far too much time working out if I could make
a thermoelectric addition to my motorcycle, I thought the
air/oil cooling would allow a bit more temp difference,
since the engines run 50-100C hotter. But no, turns out 12-
18W is optimistic. That might make a good phone charger. |
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