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# Thermoelectrics could harvest car exhaust heat

12/22/2010 04:48 AM EST
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re: Thermoelectrics could harvest car exhaust heat
3/24/2011 5:06:41 PM
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from ferotec: this type of application was on the TE application list for many many years,

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re: Thermoelectrics could harvest car exhaust heat
1/21/2011 1:32:54 AM
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I agree with @new2coding: from thermodynamics point of view re-charging your batteries using waste heat doesn't make any sense, the math just does not work...perhaps small fraction but I highly doubt whether this gadget will ever pay off in a car, show me the money or ROI...Kris

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re: Thermoelectrics could harvest car exhaust heat
12/29/2010 9:10:12 AM
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Interesting! Is there any comparison on the efficiency of those thermal electric generators? I wonder what the efficiency finally means. What we care is how much cost and weight is added in order to get the wanted power. Just for the peltier type device, we can always use matrix of devices to generate as much energy as we want if cost is not a matter.

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re: Thermoelectrics could harvest car exhaust heat
12/27/2010 5:05:28 PM
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The act of converting excess heat into electricity consumes that excess heat, so there is a net cooling effect. Putting electricity INTO a TEC just gives you control of the magnitude of the heat differential between sides--heatsinking the hot side in that case gives you a way to more effectively pull heat from the cool side (assuming you can dissipate enough heat on the hot side), but then you use electricity instead of producing it.

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re: Thermoelectrics could harvest car exhaust heat
12/27/2010 5:00:34 PM
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Read the article again. They're talking about reducing thermal conductivity (i.e. increasing thermal resistance), not the other way around.

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re: Thermoelectrics could harvest car exhaust heat
12/23/2010 3:24:08 PM
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To @p_g: it has been shown that solar cooker is more efficient than photovoltaics...the problem is you need industrial scale installation, so you can't do it at home...I believe Spain has the best installations...Kris

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re: Thermoelectrics could harvest car exhaust heat
12/23/2010 12:32:32 PM
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Another idea could be to harvest solar heat by consolidating it using solar cooker (glass changer with hi CO2) and converting to electricity. Not sure if it will be more efficient than solar energy conversion or may complement it.

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re: Thermoelectrics could harvest car exhaust heat
12/23/2010 12:29:49 PM
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Take a look at Coolchips/Powerchips. These are nanometer gap Peltier-type devices which have been waiting in the wings for years but have a claimed Carnot efficiency of at least 45%, better than this new material, if they can get them to work!

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re: Thermoelectrics could harvest car exhaust heat
12/23/2010 7:28:54 AM
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In fact equally as Solar Energy this source of energy is completely left aside and no one has looked much into it. When we drive car excessive amount of heat gets generated and needs to be radiated out using radiator. Same if the case with Refrigerators and Air-conditioners. If we can convert this heat in some other form of energy too much amount of energy can be saved/earned. When food is being cooked out of 270 deg for heat spread is wasted.

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re: Thermoelectrics could harvest car exhaust heat
12/23/2010 5:57:29 AM
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I am just wondering whether this technology can be applied to refrigerators. In that case the heat exchanger design will be radically changed and the heat taken out from the fridge compartment could be recycled back to run the fridge itself or may be used to charge the mobile batteries or run some other appliances in the kitchen

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