Zjawisko chłodzenia termoakustycznego – koncepcja stanowiska badawczego

The paper presents the feasibility study of thermoacoustic refrigerator design, composed of: acoustic inductor, resonator, stack, hot and cold heat exchangers. In addition, the methodology of optimizing the design of the thermoacoustic refrigerator with standing wave was presented. The ambient air at absolute pressure of 10 bar was assumed as the working gas in the thermoacoustic device. The average gas temperature inside the refrigerator is set at 230.65 K, and the temperature difference between cold and hot heat exchangers is 75 K. The influence of changes of normalized positions and length of the regenerator on the thermodynamic quantities (such as heat flux and Coefficient of Performance) was analyzed. During this analysis, a constant sound frequency of 600 Hz was assumed. The maximum heat output of the device was obtained for the normalized position of the regenerator x_s,n = 0.51 and normalized length L_s,n = 1. However, the highest Coefficient of Per-formence of refrigerators that excess 71% was obtained for the values of parameters corresponding to: x_s,n = 0.17 and L_s,n = 0.311. Eventually, the analyzes were performed for variable acoustic wave frequencies in range of 200-3000 Hz. The highest efficiency coefficient was reached for f_a = 600 Hz. Finally, the concept of a test stand using a designed device allowing for experimental verification of the presented thermodynamic analysis results was described. Wyniki przedstawione w niniejszym artykule zostały uzyskane z prac badawczych finansowanych w ramach BKM/540/RIE5/2016.