By >Daimaou - G.G-B
Panasonic Develops Thermoelectric Tubes for Compact Geothermal Electricity Generation and Waste Heat Recovery
Harnessing thermal energy in not something really new, but sadly such thing is still far from being mainframe, but Panasonic announcement may one day change things forever.
The concept here is very simple, converting energy from conventional hot water pipe into electricity in order to be used elsewhere. Thanks to Panasonic talented engineers and researchers the company developer a 10cm thermoelectric tube capable to generates 1.3W of electricity from hot running water of 90 °C. Compact power stations, which are capable of generating 10 kW with only 1 m3, will eventually be realized, fueled by hot springs as well as factory waste heat distributed around the world, helping people to not only save energy but also create electricity from waste heat.
Thermoelectric technology is the direct energy conversion from heat into electricity and has attracted much attention as a renewable energy solution. Since conventional thermoelectric generators are complicated in structure and restricted in planar shape, they are difficult to scale-up and implement. Panasonic’s thermoelectric tubes solve these problems by using unconventional phenomena called transverse thermoelectric effect, which takes place in tilted multilayer made of thermally-resistive thermoelectric materials and thermally-conductive metals. This effect makes it possible to control heat flow and electric current independently in materials, and realizes quite simple structure without complicated electric junctions and planar substrates.
The performance of power generation is strongly dependent on many parameters such as size of the tube and amount of heat source. Panasonic has developed the simulation technology to optimize the design of the thermoelectric tube in order to maximize the output electric power in accordance with surrounding conditions.
The thermoelectric tube is constructed by stacking conical rings of bismuth telluride as thermoelectric material and nickel as metal. Panasonic has developed processing technologies in fabricating conical rings of brittle thermoelectric materials and bonding rings with minimum parasitic electric and thermal losses.
The 10 cm-long fabricated thermoelectric tube using technologies introduced above can generate 1.3 W of electricity by running hot water of 90 °C inside, and cold water of 10 °C outside the tube. The power density corresponds to as high as 10 kW with only 1 m3 of volume. Development on system design, optimization in manufacturing and feasibility study are now under way or planned, with a view to realizing compact, efficient, and economical generators fueled by geothermal energy and waste heat in factories.
On this development, Panasonic holds 29 domestic patents and 12 overseas patents, including pending applications.
This development was partially presented at Electronic Materials Conference held in Santa Barbara, United States on June 22, 2011.