A cryogenic cooler includes a housing, and first, second, and third actuators. The first actuator includes at least one first voice coil and at least one first magnetic circuit, the at least one first voice coil of the first actuator configured to drive a compressor piston, the first actuator causing vibrations to the housing when driving the compressor piston. The second actuator includes at least one second voice coil and at least one second magnetic circuit, the at least one second voice coil of the second actuator configured to reduce the vibrations to the housing caused by driving the compressor piston. The third actuator includes at least one third voice coil and at least one third magnetic circuit, the third actuator configured to drive a displacer piston. The compressor piston, balance mechanism, and displacer piston are concentrically formed within the cryogenic cooler.

The thermoacoustic energy converting element part is provided with a plurality of through holes extending along a direction to penetrate the thermoacoustic energy converting element part to form travelling routes of acoustic waves. The thermoacoustic energy converting element part includes a wall surrounding each of the through holes to extend in an extending direction of the through hole and configured to exchange heat with the fluid. The through hole includes a hole that has a hydraulic diameter of 0.4 mm or smaller, and an open area ratio of the through holes in the thermoacoustic energy converting element part is 60% or higher. Thermal conductivity of the thermoacoustic energy converting element part in fluid atmosphere is 0.4 W/m/K or lower, and heat capacity of the thermoacoustic energy converting element part at 400 C. in the fluid atmosphere is higher than 0.5 J/cc/K.

A thermo-acoustic device for transferring energy by an acoustic wave, includes a resonator; a source for generating the acoustic wave; a thermodynamic section that forms an acoustic network and includes a compliance volume, a thermo-acoustic core and a fluidic inertia. The thermodynamic section is situated between the resonator and the source. The thermo-acoustic core is within the thermodynamic section and includes a cold terminal, a hot terminal and a regenerator. The regenerator is positioned between the hot and cold terminals. The source includes a piston compressor. The compressor is arranged as a mechanical double acting reciprocating piston compressor with a first outlet for a pressure wave generated on one side of the piston and a second outlet for a pressure wave generated on the other side of the piston. The first outlet is coupled with a first thermodynamic section, and the second outlet coupled with a second thermodynamic section.

A thermoacoustic heating device capable of effectively utilizing streaming, and including a prime mover in a first pipeline that forms a loop line, and a heating device in a second pipeline that forms another loop line. The first and second pipelines are connected to each other via a branch pipeline. A branch pipeline on the prime mover side and the second pipeline on the heating device side are positioned adjacent to each other, and a low-temperature side heat exchanger of the heating device is integrally formed with or held in contact with the branch pipeline on the prime mover side.

A cryogenic cooler includes a housing, and first, second, and third actuators. The first actuator includes at least one first voice coil and at least one first magnetic circuit, the at least one first voice coil of the first actuator configured to drive a compressor piston, the first actuator causing vibrations to the housing when driving the compressor piston. The second actuator includes at least one second voice coil and at least one second magnetic circuit, the at least one second voice coil of the second actuator configured to reduce the vibrations to the housing caused by driving the compressor piston. The third actuator includes at least one third voice coil and at least one third magnetic circuit, the third actuator configured to drive a displacer piston. The compressor piston, balance mechanism, and displacer piston are concentrically formed within the cryogenic cooler.

A thermo-acoustic device for transferring energy by an acoustic wave, includes a resonator; a source for generating the acoustic wave; a thermodynamic section that forms an acoustic network and includes a compliance volume, a thermo-acoustic core and a fluidic inertia. The thermodynamic section is situated between the resonator and the source. The thermo-acoustic core is within the thermodynamic section and includes a cold terminal, a hot terminal and a regenerator. The regenerator is positioned between the hot and cold terminals. The source includes a piston compressor. The compressor is arranged as a mechanical double acting reciprocating piston compressor with a first outlet for a pressure wave generated on one side of the piston and a second outlet for a pressure wave generated on the other side of the piston. the first outlet is coupled with a first thermodynamic section, and the second outlet coupled with a second thermodynamic section.

Heat from a safe high energy density fuel, such as aluminum, is used to generate electrical power. In some applications, the fuel may use seawater as an oxidizer. Additionally, the hybrid power system uses a highly efficient and silent thermoacoustic power converter (TAPC) to convert the thermal energy from the oxidation of aluminum to AC electrical energy. The AC electrical energy is converted to DC energy and stored in a battery. In situations demanding low power, the battery can provide power while the fuel combustion process is suspended.

A thermoacoustic machine including a device for measuring at least one parameter representative of a temperature of a first external source and/or of a second external source, and a control device configured to modulate the acoustic power generated by one or more acoustic sources such that the temperature of one said external source connected to one or more thermoacoustic cells of the machine reaches or remains substantially identical to a setpoint temperature is disclosed.

Heat from a safe high energy density fuel, such as aluminum, is used to generate electrical power. In some applications, the fuel may use seawater as an oxidizer. Additionally, the hybrid power system uses a highly efficient and silent thermoacoustic power converter (TAPC) to convert the thermal energy from the oxidation of aluminum to AC electrical energy. The AC electrical energy is converted to DC energy and stored in a battery. In situations demanding low power, the battery can provide power while the fuel combustion process is suspended.