Scientists at the University of Utah in the United States have taken another step toward acquiring alternative energy sources: they have developed a tiny device that turns heat into sound waves and turns them into usable electricity.
According to a recent report by the British "New Scientist" website, scientists have been understanding for decades that they can turn heat into sound waves using a simple device called a "hot sonic machine." But until recently, scientists at the University of Utah succeeded in miniaturizing such devices. This device can be used in power plants, automobiles, computers, and even a new generation of solar cells.
The principle of the "hot sonic machine" is to conduct heat through a copper plate to a material such as glass wool, and then dissipate the heat to the surrounding air. This flow of hot air produces a single-frequency sound wave that can be generated using this acoustic wave to oscillate the piezoelectric electrode.
Most existing generators are large and inefficient, making it difficult to match small appliances such as computers. The "hot sonic machines" developed by scientists at the University of Utah are only 1.8 mm long. If multiple "hot sonic machines" are integrated, they can generate 1 watt of electricity per cubic centimeter.
Scientist Oreste Simco said: "The device looks very hopeful (in practical use). However, there is still a lot of work to be done right now."
Scientists at the University of Utah plan to test the micro "thermothermal heat engine" for another year and then try mass production. If all goes well, the device will be expected to be installed first in a natural gas or coal-fired power plant.
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