According to a recent report by the American "Popular Science" magazine, researchers at Purdue University in the United States are working with General Motors to develop a thermal generator that uses a temperature difference to generate electricity. This type of generator can convert the heat from the vehicle exhaust into electrical energy. Achieve the goal of "eat" car exhaust and save fuel.
Starting in January of this year, the R&D team has been trying to install an initial model of metal chips after the automotive three-way catalytic converter. This model can collect heat from the exhaust gas up to 700 degrees Celsius.
Xu Xianfan, a professor of mechanical engineering at Purdue University who led the study, explained that because of the huge temperature difference in the process of converting heat energy into electricity, and only if this temperature difference persists to generate electricity, this metal must be able to withstand huge The temperature difference - one side is exposed to high temperature gas is heated, and the other side must be kept at a low temperature.
One of the biggest challenges for the R&D team is to find a metal with poor thermal conductivity so that the heat in the vehicle exhaust does not pass from one side to the other.
Researchers at GM are currently testing a metal called skutterudite, which contains a mixture of cobalt, arsenide, nickel and iron, such as a rare earth alloy containing yttrium. The thermal conductivity of skutterudite is reduced again.
The thermoelectric conversion technology can not only provide electric power for vehicles, but also recycle waste heat from homes and power plants, as well as new solar cells.
The U.S. National Science Foundation and the Department of Energy have provided the project with a total of US$1.4 million in financial support.
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