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Print 28 comment(s) - last by HrilL.. on Oct 17 at 5:14 PM

A new discovery made in thermoelectrical crystal compounds helps explain heat conduction at the molecular scale.

Though thermoelectric materials are quite common, they are not yet widely used as one might expect. The reason is largely that until very recently, these materials have been either very inefficient or very expensive. However, several groups of researchers have been working to solve the mysteries of these exotic compounds and bring them to the world en masse.

DailyTech has previously reported on a few endeavors with thermoelectrics. Mildred S. Dresselhaus's ongoing work at the Massachusetts Institute of Technology looks to create more efficient materials by manufacturing tiny particles or wires into them to disrupt the flow of heat. This would make materials that are already great electrical conductors much more thermally inert, allowing for greater heat-to-electricity or electricity-to-heat/cold conversion potential.

Another group at the University of California at Berkley, led by Professor Peidong Yang is looking into new materials. Silicon itself is not a great thermoelectric material – until venturing into nanoscale. Silicon nanowires have been shown to be one hundred times more efficient at the energy conversion than bulk silicon.

Publishing its findings in the most recent issue of Nature Materials, a group of scientists from the University of Århus, Risø-DTU and the University of Copenhagen has unlocked another secret of certain thermoelectric compounds which may help develop more efficient materials. Their work involves clathrate compounds, which are compounds composed of a “cage” of one type of molecule that surrounds a second type.

Initially it was believed that the movement of the trapped molecule was solely responsible for the way the compound conducted heat. After using neutron scattering to study the movement of the atoms inside the molecules, they realized it was the movements of the atoms in the cage that brought about the advantageous property.

Kim Lefmann, an associate professor of the Nano-Science Center, Niels Bohr Instituate at the University of Copenhagen explains, “Our data shows that, it is rather the atoms' shared pattern of movement that determines the properties of these thermoelectric materials. A discovery that will be significant for the design of new materials that utilize energy even better.”

Understanding the mechanism behind this thermal insulation will help scientists design better thermoelectric materials. These types of materials are finally being put to use in some of the places you might expect, such as vehicle auxiliary power generation from waste heat. The same waste heat could theoretically be used to power interior cooling systems via heat to energy to heat (and cooling) transference.

Thermoelectric materials have a tremendous amount of potential for use in everything from vehicles to homes and businesses to electronics. Better understanding of how these materials work will spawn more efficient materials and perhaps one day these things will be powered, cooled and heated by super thermoelectric devices.



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RE: Awesome
By mindless1 on 10/8/2008 4:26:21 PM , Rating: 2
In your gas oven you want the heat radiated back not absorbed and converted, or else you'd have to supply more input fuel for the same cavity temp (until done cooking when power is turned off).

For most people the gas oven solution is deciding if they really need to cook something as big as an entire turkey at once and if not, opt for a smaller cavity oven with more insulation around it.


RE: Awesome
By HrilL on 10/9/2008 3:55:18 PM , Rating: 2
Or if you have a way to turn it on and off when needed. Because once you are done cooking you no longer need all that heat that you pretty much just trash unless your house is cold but the amount it would heat wouldn't be very much.

You could have it turn on when you turn your oven off and turn off when your oven is on.


RE: Awesome
By mindless1 on 10/10/2008 12:31:58 AM , Rating: 2
Anyone already has the option of setting their oven to turn off early and let the remaining heat finish the cooking. No tech change at all needed for that, and I often do this myself.


RE: Awesome
By HrilL on 10/17/2008 5:14:40 PM , Rating: 2
Really I highly doubt that. Most people don't have modern ovens that can do that and I bet most of the people that do don't have a clue how to go about doing that in the first place.


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