Thermoelectric tubes generate 1.3 W of electricity by using hot water of 90 °C

Panasonic has developed thermoelectric tubes suitable for fluid heat sources such as hot water and steam, for capturing unused or wasted heat from hot springs and factory. The tubular shape enables direct and efficient heat transfer without additional heat exchangers, yielding high density of generated power.

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.

According to Panasonic the performance of power generation is dependent on many parameters such as size of the tube and amount of heat source. 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 as per Panasonic.