Tuesday, 9 May 2017

Cheapest carbon 0 power


Is achieved by 350oC, over a 'p' and 'n' type semiconductor sandwich.
Fig 4 Schematic representation of a nanocomposite material. Red cubes of nanometre dimensions (eg Ag and Sb rich regions) are embedded in the blue host material (eg PbTe).2
The second big step forward came from a theoretical prediction that large Seebeck coefficients could be achieved in nanostructured materials. These are composite materials where nanometre regions of material A are embedded in material B (fig 4). The increase in the Seebeck coefficient comes from changes in the electronic structure when the dimensionality of a material is reduced. This concept was proven in carefully grown quantum dot thin-films but has been found difficult to translate to bulk materials. However, fortunately, the large number of interfaces in nanostructured materials are very efficient at reducing the lattice thermal conductivity. This happens because lattice vibrations behave like waves in a solid. The propagation of waves with wavelengths shorter than the size of the nanodomains are not affected but waves of similar length are scattered very effectively. It is this effect that leads to a large reduction in thermal conductivity.

So no rare Earth metals. And the thickness of the p and n layers gives us great efficiencies. But we do not use waste heat, we fire us a 50x1cm steam plasma tube at 4 atmospheres, that turn 2x10-12cc of regular water into a constant 2.1MW of heat – our thermoelectric generator will turn into 144kW of carbon 0 heat. 1.2 million every year from the national grid.

https://en.wikipedia.org/wiki/Thermoelectric_materials
Thermoelectric materials show the thermoelectric effect in a strong or convenient form.
The thermoelectric effect refers to phenomena by which either a temperature difference creates an electric potential or an electric potential creates a temperature difference. These phenomena are known more specifically as the Seebeck effect (converting temperature to current), Peltier effect (converting current to temperature), and Thomson effect (conductor heating/cooling). While all materials have a nonzero thermoelectric effect, in most materials it is too small to be useful. However, low-cost materials that have a sufficiently strong thermoelectric effect (and other required properties) could be used in applications including power generation and refrigeration. A commonly used thermoelectric material in such applications is bismuth telluride (Bi
2
Te
3
).
Thermoelectric materials are used in thermoelectric systems for cooling or heating in niche applications,[1] and are being studied as a way to regenerate electricity from waste heat.[2]



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