Abstract
We have constructed and tested a travelling wave thermoacoustic refrigerator using a coaxial configuration with the regenerator positioned in the annulus. We have tested the device using three operating frequencies: 100 Hz, 140 Hz and 200 Hz. The rise and the descent from an initial temperature were recorded at both ends of the regenerator for 60 minutes. This is due to the fact that the change in frequency has caused a change in the direction of the dominant travelling wave at one end of regenerator. This will change the heat pumping direction within the regenerator as it is dependent on the direction of the dominant travelling wave at that end.
