Panasonic Develops Thermoelectric Tubes for Compact Geothermal Electricity Generation and Waste Heat Recovery

Panasonic opens up the way to generate electricity by harnessing thermal energy in conventional hot water piping

Press Release

Thermoelectric Tubes

June 30, 2011
Osaka, Japan - Panasonic has developed innovative thermoelectric tubes especially suited for fluid heat sources such as hot water and steam. The tubular shape enables direct and efficient heat transfer without additional heat exchangers, yielding high density of generated power. Panasonic’s thermoelectric tube with simple, compact, and efficient features is an ideal solution for capturing unused or wasted heat from hot springs and factory.

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 planarshape, 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 suchas 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.

Panasonic opens up the way to generate electricity by harnessing thermal energy in conventional hot water piping. The 10 cm-long thermoelectric tube generates 1.3W of electricity from hot running water of 90°C. Compact power stations, which are capable of generating 10 kW with only 1m^3, will eventually be realized, fueled by hot springs as well as factory waste heat distributed around the world.

The thermoelectric tube is constructed by stacking conical rings of bismuth tellurideas 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 10cm-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.

Back to Magazine

All Rights Reserved