PROBLEM TO BE SOLVED: To provide a thermoacoustic engine and a thermoacoustic refrigerator which can reliably generate desired acoustic outputs or refrigeration outputs.;SOLUTION: An energy collector 20 comprises an air columnar tube 21 in which working fluid is sealed, a heat accumulator 25 arranged in the air columnar tube 21, a high temperature heat exchanger 26 which heats one end of the heat accumulator 25 using exhaust gas from an internal combustion engine 1 as a heat source and a low temperature heat exchanger 27 which cools the other end of the heat accumulator 25 with cooled water from the internal combustion engine 1, and forms temperature gradient between both the ends of the heat accumulator 25 to generate the thermoacoustic self-excited oscillation of the working fluid. The heat accumulator 25 which constitutes a thermoacoustic engine together with the high temperature and low temperature heat exchangers 26 and 27 comprises an expansion stack 251 and an actuator 252 which expands and contracts this expansion stack 251, and can change the temperature gradient formed between both the ends.;COPYRIGHT: (C)2005,JPO&NCIPI
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