Acoustic Expander

Described herein is an expander comprising a resonator having a resonator chamber and an input port, wherein the input port is configured to be coupled to a fluid source having a first pressure and a first temperature. In some embodiments, the expander comprises a first acoustic driver disposed at the input port of the resonator, wherein in response to pressure applied thereto, the first acoustic driver oscillates between an open state and a closed state to generate an acoustic wave within the resonator chamber. In some embodiments, the first acoustic driver comprises one of: a reed valve, a jet edge valve, a rotary valve, a high-speed computer controlled valve, or a solenoid valve. In some embodiments, in response to pressure applied thereto, the first acoustic driver oscillates between the open state and the closed state at a frequency that substantially matches a resonant frequency of the resonator chamber.