Abstract
To recover waste heat, there is a need for energy conversion techniques to convert heat into electricity or mechanical work, especially for heat at low temperature. Thermoacoustic energy conversion technology could be applied for energy harvesting. There are 4 typical methods to convert thermoacoustic power (high-amplitude acoustic waves) into electricity. These include (1) piezoelectric generators, (2) electromagnetic elements (loudspeakers and linear alternators), (3) magneto-hydrodynamic generators, and (4) bi-directional turbines. In this chapter, we introduce and describe the thermal energy harvesting by designing a standing-wave thermoacoustic system integrated with a piezoelectric element. In this way, effective small-scale power generation process by converting heat (waste) into electricity is achieved. Both experimental and theoretical modeling analyses of the standing-wave thermos-acoustic-piezo system are conducted. Preliminary results and interesting findings are obtained.
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