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This study assesses the efficiency of an upgraded Standing Wave Thermoacoustic Refrigerator (TAR) for enhanced cooling performance. A transient theoretical model, developed using the Linear Theory of Thermoacoustic, predicted temperature distributions, cooling behavior, and pressure fluctuations, and these predictions were subsequently validated through experimental techniques. The TAR system was tested using helium gas as the working fluid at charging pressures ranging from 4 to 10 bar, with an input power of 25 W. The results demonstrated that higher operating pressures significantly improved cooling efficiency, with a steady-state cold-end temperature of 9.3 ℃ at 10 bar and a temperature lift of 21.9 ℃, compared to 15.6 ℃ and 15.3 ℃, respectively, at 4 bar. The cooldown time to reach thermal equilibrium was 10 min at 10 bar, decreasing progressively with lower pressures. Transient analysis revealed rapid temperature stabilization in the stack, with equilibrium attained within 36,000 s (10 h). Comparative studies with existing TAR models indicated significant improvements in cooling efficiency due to optimized stack arrangement, enhanced insulation, and refined working parameters. These findings validate the potential of high-pressure helium for maximizing the efficiency of thermoacoustic refrigeration systems.

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Enhanced Performance of a Standing Wave Thermoacoustic Refrigerator Using Optimized Design Parameters and Helium Gas at High Pressure

  • 会议论文

  • 发表日期：

    2026年

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  • Mohammed A. Farhan,
  • Qais A. Yousif

摘要

This study assesses the efficiency of an upgraded Standing Wave Thermoacoustic Refrigerator (TAR) for enhanced cooling performance. A transient theoretical model, developed using the Linear Theory of Thermoacoustic, predicted temperature distributions, cooling behavior, and pressure fluctuations, and these predictions were subsequently validated through experimental techniques. The TAR system was tested using helium gas as the working fluid at charging pressures ranging from 4 to 10 bar, with an input power of 25 W. The results demonstrated that higher operating pressures significantly improved cooling efficiency, with a steady-state cold-end temperature of 9.3 ℃ at 10 bar and a temperature lift of 21.9 ℃, compared to 15.6 ℃ and 15.3 ℃, respectively, at 4 bar. The cooldown time to reach thermal equilibrium was 10 min at 10 bar, decreasing progressively with lower pressures. Transient analysis revealed rapid temperature stabilization in the stack, with equilibrium attained within 36,000 s (10 h). Comparative studies with existing TAR models indicated significant improvements in cooling efficiency due to optimized stack arrangement, enhanced insulation, and refined working parameters. These findings validate the potential of high-pressure helium for maximizing the efficiency of thermoacoustic refrigeration systems.