多段熱音響機関の冷凍機温度（作動気体を大気圧空気とした基礎的検討）

概要

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A cascade thermoacoustic engine that can lower the critical onset temperature was suggested recently. It has been reported that critical onset temperature was successfully lowered with multistage amplification. However, a cascade thermoacoustic engine that uses multiple regenerators needs installation of regenerators not only at the peak of acoustic impedance distribution in real part, and therefore is generally inefficient. In this report, we calculated the configuration of the cascade-type double-loop thermoacoustic refrigerator, and then calculated the temperature ratio of the refrigerator and its efficiency when the temperature ratio of the prime mover is changed. The cascade-type double-loop thermoacoustic refrigerator realized oscillation atΔT=159.5K, which is equivalent to industrial exhaust heat, and the entire apparatus showed 11% of Carnot efficiency. The result shows that low temperature drive and high efficiency can both be achieved with a cascade thermoacoustic engine.