Thermoacoustic device

A method for manufacturing a thermoacoustic device for transfer of energy by an acoustic wave, the thermoacoustic device comprising a process volume, the process volume being filled with a working fluid through which the acoustic wave is to propagate, the process volume comprising an acoustic network comprising a loop configured with a passage;

• the loop being a tube configured as an acoustic circuit provided with a compliance volume, a thermoacoustic core arranged within the loop, an inertance volume and a thermoacoustic core;
• the passage providing an opening in the loop spaced apart from the thermoacoustic core;
• wherein the loop connects the thermoacoustic core and the passage via two separate paths;
• wherein a first side of the thermoacoustic core is at a first path length from the passage in one of the two paths, and a second side of the thermoacoustic core is at a second path length in the other of the two paths;
• wherein the method comprises:
• providing a partitioning element configured to close off the cross-section of the tube and to be impermeable to the working fluid, wherein the partitioning element has a spring constant and comprises a first side and a second side, the first side is configured to receive the acoustic wave, the second side is configured to transmit pressure waves in the working fluid in response to the first side receiving the acoustic wave, and wherein the pressure waves are based on a value of the spring constant;
• and arranging the partitioning element within the loop
• wherein the partitioning element comprises a central section and an outer section that is joined to a circumference of the central section by means of a spring arrangement;
• the outer section being attached to a wall of the loop and a flexible seal is arranged on the circumference of the central section.