Panasonic announced on April 15, 2014 that the company had used a waste heat of 96°C hot water to achieve a power generation capacity of 820W/m3 per unit volume in the verification test of thermal power generation pipes. Converted to the set area, the power generation performance has reached about 4 times the photovoltaic power generation.
A thermoelectric power generation tube is a tubular thermoelectric conversion element in which a Bi—Te type thermoelectric conversion material and a metal are alternately laminated in a direction inclined to a heat flow direction. The principle of operation is to let warm water flow inside the thermoelectric tube and cool the outside with cooling water, so that a periodic temperature distribution occurs inside the element, thereby generating a current in the direction perpendicular to the heat flow (the axis of the thermoelectric tube). Its characteristic is that even if the temperature difference is small, it can obtain electricity.
According to Panasonic, the verification test was carried out at the "Northeastern Clean Center" of the garbage disposal facility in Sagano District, Kyoto City. Some of the warm water pipes and cold water pipes in the center were replaced by three sets of thermal power units, each containing 10 units. Thermal power generation pipe, using surplus waste heat to generate electricity. Specifically, a maximum 246 W power generation was achieved at a temperature difference of 91° C. using 96° C. waste water and 5° C. cooling water. The unit volume of power generation is more than 10% higher than the design value, and it can still operate stably after 200 hours of continuous operation.
In the future, Panasonic will continue to conduct power generation verification tests in the Northeast Clean Center, and will also work hard to improve the reliability of the thermal power unit. In addition, it is necessary to develop a highly versatile system that can be easily installed in existing facilities, and to promote the development of the technology by realizing the mass production of thermal power generation pipes. (Reporter: Yoshida, "Nikkei Manufacturing")
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