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Study on a direct-coupling thermoacoustic refrigerator using time-domain acoustic-electrical analogy method

Author

Listed:
  • Xiao, Lei
  • Luo, Kaiqi
  • Chi, Jiaxin
  • Chen, Geng
  • Wu, Zhanghua
  • Luo, Ercang
  • Xu, Jingyuan

Abstract

Thermoacoustic refrigeration is a clean cooling technology with high reliability. In this study, a time-domain acoustic–electrical analogy (TDAEA) method is proposed and improved, then applied to explore the performance of a high-efficiency 2-stage looped direct-coupling heat-driven thermoacoustic refrigerator. The effectiveness of the method is verified by experiments. Transient evolutions of oscillating pressure and volume flow rate are first presented. System performance under different working gases is explored, and helium is chosen due to its much larger cooling power. The influences of cooling and ambient temperatures and cavity parameters on system performance are then investigated. The results show that a rise in ambient temperature leads to a dramatic decline in cooling power. Moreover, the influences of cavity parameters are complicated. When the diameter and length of the cavity are respectively 95 mm and 440 mm, the cooling power achieves a maximum of 3.65 kW with COP of 0.76; while with diameter and length reaching 90 mm and 360 mm, respectively, a peak COP of 0.82 with cooling power of 1.47 kW is obtained. Furthermore, a comparison between the presented direct-coupling system and a series-connection system is performed. The results show better performance of the direct-coupling system, which achieves a cooling power of 5.08 kW under air-conditioning case, 22.4 % higher than that of the series-connection system, implying its superiority in air-conditioning field for larger cooling capacity and more compact configuration. This study provides a new perspective for understanding ofthermoacoustic refrigerators.

Suggested Citation

  • Xiao, Lei & Luo, Kaiqi & Chi, Jiaxin & Chen, Geng & Wu, Zhanghua & Luo, Ercang & Xu, Jingyuan, 2023. "Study on a direct-coupling thermoacoustic refrigerator using time-domain acoustic-electrical analogy method," Applied Energy, Elsevier, vol. 339(C).
    • Handle: RePEc:eee:appene:v:339:y:2023:i:c:s0306261923003367
    DOI: 10.1016/j.apenergy.2023.120972
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    References listed on IDEAS

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