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i wanna use thermoelectric material for temp to electricity conversion ? Answered

input  temp 200 deg celcius for glowing LED`s how many such materials should i use?

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mpilchfamily
mpilchfamily

8 years ago

Will these materials are generally used to cool items since they are extremely inefficient at generating electricity. The best reported efficiency i've found it around 10% but it's typically down around 5% efficient. This is why you can find all sorts of info on how to use them to cool things and calculate the size peltier you need to keep your device cool but not a lot on using them for generating power.

After doing a bit of research it seems you can get a typical 3"x3" peltier to output up to 12V. But you gotta bee at the top end of it's temperature range and there has to be a distinct difference between the hot and cool side. You will need a good size heat sync on the cold side. But once again you loose a lot of efficiency. I'm sure you can find much better ways of utilizing your heat source.

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steveastrouk
steveastrouk

Answer 8 years ago

That's still 10X better than metal-metal thermocouples. The big problem is they don't like temperatures above 150C.

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shiblinomani
shiblinomani

Answer 8 years ago

but as per I read BMW is going to use the same technology .... and its efficiency is also increased nowadays.

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steveastrouk
steveastrouk

Answer 8 years ago

"is going to" probably means they are pumping huge amounts into R+D on the topic. There are proposed materials that increase efficiency, but the last time I spoke to the Marlow rep (best cells in the world) they had a nasty habit of exploding on contact with oxygen.....

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shiblinomani
shiblinomani

Answer 8 years ago

i agree but recent research has been done to improve the efficiency upto 20% using telluride or some other materials ... the mars rover curiosity is also using the same technology for its energy gen .... i think we can do something wid these waste heat ...

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steveastrouk
steveastrouk

Answer 8 years ago

Bismuth telluride is still the gold standard for affordable thermoelectrics. Its still rotten efficiency though.

Mars Rover's RTG is a maximum of 5% efficient - and that's the state of the art.

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mpilchfamily
mpilchfamily

Answer 8 years ago

Yes and those are very costly. Your talking hundreds if not thousands of dollars for the newer tech. That's if you can even buy one commercially. The tech is very interesting and if they are able to improve the tech then many be one day it will be a viable source of power and means of improving efficiency for other devices. Its only a matter of time.