B205 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(OS10 外燃機関・廃熱利用)

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When a narrow duct (regenerator) is installed in a tube while the temperature ratio is higher than some critical value at both ends of the regenerator, the gas inside starts self-excited oscillation. Same phenomenon is used in thermoacoustic engines. To the contrary, it is possible to produce temperature gradient in the regenerator and achieve refrigeration by forcing the gas in the regenerator to oscillate. By combining a prime mover that generates sound wave out of heat and a refrigerator that uses sound wave, a refrigerator with no moving parts that is driven by heat input can be realized. However there is an issue to be solved before its practical use. While most industrial heat ranges from 100℃ to 300℃, critical onset temperature of a thermoacoustic engine is higher, ranging from 300℃ to 700℃. In order to solve this problem, 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 at ΔT=160.5K, 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.
2011-06-22

B205 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(OS10 外燃機関・廃熱利用)

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