Experimental investigations of the performance of a standing wave thermoacoustic refrigerator based on multi-objective genetic algorithm optimized parameters

• Optimization of a standing wave thermoacoustic refrigerator using MOGA.
• Minimizing acoustic power and maximizing cooling power through MOGA to improve COP.
• Lsn, xsn, and B are optimized simultaneously to obtain the optimum COP.
• Comparison of optimized results from MOGA with experimental work.

This paper presents an experimental work based on the results from the Multi-objective Genetic Algorithm (MOGA) optimization scheme for a standing wave thermoacoustic refrigerator. In this study, the performance of the thermoacoustic refrigerator is based on the temperature difference measured at the end of extremities of the stack. The optimized variables are the stack length, stack center position and the plate spacing represented by the blockage ratio. Two different stacks were investigated: 1) spiral geometry build from Mylar, and 2) ready-made ceramic Celcor stack. Comparisons of the effects of the stack length, center position and plate spacing were completed between the optimized outcomes from MOGA and that measured experimentally. Results showed good agreement, confirming that values other than the optimized stack length of 4 cm, stack center position of 4 cm, and the stack separation gap of 0.36 mm did not give the desired high performance of the thermoacoustic refrigerator.