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"The 400W Thermoacoustic Chiller works on similar principles to that of a traditional refrigerator, except that it uses sound waves instead of a compressor to create the cooling effect. In basic terms, the thermoacoustic chiller is a closed-pressure vessel that contains a stack of fine-mesh window screens called a 'regenerator,' along with two heat exchangers, and a source of acoustic energy. The source, in this case, is a souped-up loudspeaker that generates high-amplitude sound energy in an environmentally safe inert gas (helium), which is converted into cooling power. The sound levels needed to make this happen (173dB) can only be reached in contained, pressurized gas."
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