Improving Engine Efficiency with Thermoelectrics

Fri Jul 25 20:53:00 -0700 2008
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New advances in thermoelectrics materials science could be another way to stretch the fuel when driving, or provide more efficient generators. The waste heat with vehicle engines is just that, a lot of wasted energy. By being able to extract a lot of that and transform it into electricity, you could be driving a lot more miles with your electric accessories running for only a bit more cost, or be recharging the batteries faster in your hybrid.

"Thermoelectrics are also very small," he added. "I like to say that TE converters compare to other heat engines like the transistor compares to the vacuum tube." ed.z.: Anything to make those catalytic converters useful beyond starting grass fires when you park them over some weeds. I hope these researchers can get these devices functional and out there soon, it sure would help in this transition to pure or partially electric drive vehicles. Or how about using that at the focal point of a solar thermal concentrator rig, instead of using heat transfer liquid or gases to a turbine? A pure solid state approach. And I'd like one for the woodstove as well, I think it would be a spiffy add on. They have some crude models out there already you can get that slip into the stove pipe stack, but they aren't that great yet either. I've wondered what happened to this tech for decades now ever since I saw a table radio running off of a thermocouple equipped kerosene lantern that was imported from Russia in ww2 by a boss I had, the owner of the dairy I worked at. It worked, I mean the dang thing worked using waste heat, that was his main shop radio. Pretty funny to see a radio plugged into a kerosene lamp! Imagine a kerosene lantern with air cooled engine fins around the bottom base fuel tank container part, that kind of swept up a little ways around the wick and flame area, but not so much as to block the light, that's what it looked like.

Improving Engine Efficiency with Thermoelectrics
Fri Jul 25 21:27:46 -0700 2008
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BMW announced a short while ago, a system that extracted energy from the engine cooling system.

Improving Engine Efficiency with Thermoelectrics
Fri Jul 25 23:40:13 -0700 2008
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Are you talking about their Turbosteamer project?  That isn't based on thermoelectrics but rather steam co-gen to power a turbo.

Improving Engine Efficiency with Thermoelectrics
Fri Jul 25 23:44:59 -0700 2008
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Yes, that is the one.  I know it is not thermoelectrics, but it is the same idea of recovering energy that is currently going to waste.

Improving Engine Efficiency with Thermoelectrics
Fri Jul 25 22:05:37 -0700 2008
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Okay, now I'm confused.  The article says the particular material works in the range of automobile engine temperatures, from 450 - 950 degrees F.

What temp does a car engine run at?  The gague on my Jeep goes from 110 to 240, with the thermostat opening at 160 degrees to allow coolant flow.  I just replaced the thermostat and temperature sensor on the vehicle and it doesn't rise above 170 degrees.

Where on an engine are they measuring 900 degrees?

Improving Engine Efficiency with Thermoelectrics
Fri Jul 25 22:16:38 -0700 2008
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Exhaust gas temperatures run in that range.

Improving Engine Efficiency with Thermoelectrics
Sat Jul 26 08:50:16 -0700 2008
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so, never seen your exhaust manifold in the dark after engine running for awhile?  it will be that dull red glowing thing  8D

Improving Engine Efficiency with Thermoelectrics
Sat Jul 26 11:23:23 -0700 2008
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we used to go to work and about a hour before lunch thow some corn on the cob wrapped in aluminum foil up on the exhaust manifold of the diesel driven air compressor and it would be roasted by lunch time. Exhaust temp can range as high as 1450 F, TF1 engine will have incandescent exhaust gases visible 3 feet out from the headers when the throttle is down, by eyeball they must be about 3-4,000 F.

Improving Engine Efficiency with Thermoelectrics
Sat Jul 26 11:29:28 -0700 2008
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I've often wondered how much energy was in the acoustic energy of the exhaust.