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I think exhaust driven alternators are already baked (they're at least in development), and its already been posted on the halfbakery. Sorry I don't have a link for you (its late and I'm tired). It's still a pretty good idea though. |
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The 'turbo alternators' under development are part of an integrated system including turbo, supercharger and alternator.
It must also be understood that the energy in exhaust gas is not free. A turbo creates back pressure, which makes it harder for the engine to push exhasut out. When this is used to increase inlet pressure, it is an advantage because it means the volumetric effeciency of the engine is improved and that is worth more than the 'cost' of the added back pressure.
I would also argue your figures. A very powerful (750W) alternator uses about 2 HP if it is working flat out, which it usually isn't.
A 50 HP turbo is a small gas turbine engine. Energy available in exhaust gas pressure is maybe a few HP, but it's not free. |
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hmm didn't realise it was already done... but the very small back pressure that the device would create would be nothing to compared to the benefits. i don't know how much HP it would take to run each of these things that are now run off of belts but you could mix and match these things anywhere from 2hp for just the alternator to however much this half turbo can run. your right the exaust if not free energy but it's next to free, were wasting a lot of useable energy. |
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