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Thermoelectrics could harvest car exhaust heat

12/22/2010 04:48 AM EST
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_hm
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re: Thermoelectrics could harvest car exhaust heat
_hm   12/22/2010 6:20:48 AM
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This is wonderful innovation. This can be used in other electronics assembly. One field of interest will be LED lighting. It will increase the efficincy of light source and make its life longer with more uniform light source.

R_Colin_Johnson
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re: Thermoelectrics could harvest car exhaust heat
R_Colin_Johnson   12/22/2010 7:10:54 PM
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Yes, I agree regarding LEDs. Today a lot of effort is being put into keeping solid-state lighting cool, since am LED's lifetime is drastically shorted by overheating. Using thermoelectrics could cool LED arrays and recycle the energy to lower your electricity bill too!

wilber_xbox
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re: Thermoelectrics could harvest car exhaust heat
wilber_xbox   12/22/2010 8:09:13 PM
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not only LEDs, we can think of myriad applications where efficient heat conversion into electricity can be used. Depending on how expensive the material will be, it can be alternative way to generate electricity.

chanj0
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re: Thermoelectrics could harvest car exhaust heat
chanj0   12/22/2010 7:52:44 AM
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On one hands, this is a fantastic news. Energy harvesting is going to be, if not already, the next biggest research area in this decade. There will be more people benefit from the result. On the other hands, more rare earth material is going to be used. I hope there is innovation in material science and nanotech that an alternative will be found in the near future.

agk
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re: Thermoelectrics could harvest car exhaust heat
agk   12/22/2010 2:55:16 PM
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The TEG devices or the TEC devices need to maintain a highest possible temp difference across its sides for maximum efficiency .This is highly complicated.If this new invention does not need this to be done then it will have a commercial win.

DrQuine
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re: Thermoelectrics could harvest car exhaust heat
DrQuine   12/22/2010 4:40:46 PM
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After the catalytic converter, how much heat can be "mined" from the vehicle exhaust before there are environmental or operational efficiency impacts? This technology could also harvest waste heat from furnaces while electronically ensuring that the temperature doesn't get too low which would increase chimney deposits and impair the necessary vertical convection draft.

R_Colin_Johnson
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re: Thermoelectrics could harvest car exhaust heat
R_Colin_Johnson   12/22/2010 7:07:08 PM
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For automotive applications, the researchers said the thermoelectric material would recover the heat before the exhaust enters the catalytic converter, which usually have temperature sensors inside. Of course, temperature would have to be monitored by the control electronics to make sure the thermoelectric do not cooled the catalytic converter below its optimal operating temperature.

selinz
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re: Thermoelectrics could harvest car exhaust heat
selinz   12/22/2010 6:07:22 PM
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Any time we can get energy recovered from petroleum that would otherwise exit the tail pipe, that's a plus. Hopefully it wiil be enough to overcome the negatives

goafrit
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re: Thermoelectrics could harvest car exhaust heat
goafrit   12/22/2010 10:08:42 PM
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These are technologies that would have made the future innovations of the 2011. I did not see this technology in the list of technologies to watch for.

krisi
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re: Thermoelectrics could harvest car exhaust heat
krisi   12/22/2010 10:58:15 PM
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Very interesting idea...one problem is obvious: you need to increase efficiency, the second is probably less obvious: how rare is this material?...we see now that some technologies based on rare materials can be expanded on a massive scale due to material shortages (and increased material costs)...Kris

Dave.Dykstra
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Dave.Dykstra   12/23/2010 4:03:53 AM
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This is a fascinating area. Sooner or later, some technology will reach the point where the efficiencies enable adoption and we all reap the benefits. This could go a long way toward making the hybrid vehicle more electric.

prabhakar_deosthali
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re: Thermoelectrics could harvest car exhaust heat
prabhakar_deosthali   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

Kinnar
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re: Thermoelectrics could harvest car exhaust heat
Kinnar   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.

Amcfarl
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Amcfarl   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!

GREAT-Terry
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re: Thermoelectrics could harvest car exhaust heat
GREAT-Terry   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.

p_g
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p_g   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.

krisi
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re: Thermoelectrics could harvest car exhaust heat
krisi   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

Lethean
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re: Thermoelectrics could harvest car exhaust heat
Lethean   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.

Lethean
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re: Thermoelectrics could harvest car exhaust heat
Lethean   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.

krisi
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re: Thermoelectrics could harvest car exhaust heat
krisi   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

vrancean
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re: Thermoelectrics could harvest car exhaust heat
vrancean   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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