Patent ID: 7804046

Claim:
An acoustic heating apparatus comprising: a loop tube comprising a first tube portion and a second tube portion; a first stack sandwiched between a high-temperature-side heat exchanger and a low-temperature input-side heat exchanger provided in the first tube portion, the first stack providing channels to connect the high-temperature-side heat exchanger with the low-temperature input-side heat exchanger, a liquid being circulated around the high-temperature-side heat exchanger: and a second stack sandwiched between a low-temperature-side heat exchanger and a high-temperature output-side heat exchanger provided in the second tube portion, the second stack providing channels to connect the low-temperature-side heat exchanger with the high-temperature output-side heat exchanger, the liquid being circulated around the low-temperature-side heat exchanger, wherein a temperature gradient is generated in the second stack by propagating a standing wave and a traveling wave generated in the loop tube from the first stack to the second stack, and heat is output from the high-temperature output-side heat exchanger disposed on the second stack side.