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Tokai University research: Innovative refrigerator developed using multistage sound wave engine (WK-intern) - Shinya Hasegawa and colleagues at Tokai University have developed a refrigerator ( 107 °C) powered only by waste heat that generated sound waves in an innovative multistage traveling wave thermoacoustic engine. Hiratsuka, Japan - The refrigerator produced the gas oscillations and refrigeration at a temperature lower than the boiling point of water and achieved a minimum cold temperature of -107.4 °C when the hot temperature was 270 °C. The findings are published in the journal of Applied Thermal Engineering, November 2016. The operation of thermoacoustic (TA) engines is based on the