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Old 07-21-2017, 01:52 PM   #8 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,099

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Thanks for continuing the thread. That's a lot of TEGs at $20-$25 each!

I think this description so far suggests significant complexity in using TEGs to replace an alternator entirely. A much simpler set up would contribute to reducing alternator need. It could be smaller and cheaper.

To tvago's good points, I assume we'd use cooling fins if we put a TEG unit into the under car airstream. Daox is talking about a lot of TEGs, and I think they would not easily fit around the manifold. Better to be lined-up along the straight middle sections of exhaust piping. Some sort of forced airflow seems possible under the car, along the piping, quite easily. Personally, I would sacrifice temp differential for system simplicity. Coolant circulation makes for complexity.

Any system would need some kind of controller, yes? And there would be a need for a way to prevent the TEGs from drawing power when the car is cool, maybe? There might be situations in which ambient air is warmer than exhaust piping, no?
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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