Cooling Performance and Sound Characteristics of Double-Loop Type Thermoacoustic Cooler with Branch Resonator

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  • KYODEN Tomoaki
    National Institute of Technology, Toyama College
  • TADA Yukio
    National Institute of Technology, Toyama College
  • IDA Yuya
    Institute of Science and Engineering, Faculty of Mechanical Engineering, Kanazawa University

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Other Title
  • 枝管付きダブルループ管型熱音響冷凍機における 音場特性と冷却性能
  • シカン ツキ ダブルループカンガタ ネツ オンキョウ レイトウキ ニ オケル オンジョウ トクセイ ト レイキャク セイノウ

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Abstract

The thermoacoustic cooler is one of promising technique for utilization of unused thermal energy. The object of this paper is to study the improvement of performance in a single-loop type thermoacoustic cooler by designing of the new structure consisted of looped tube, bypass-looped tube, and two stacks as the double-loop type thermoacoustic cooler. Using finite difference time-domain (FDTD), pressure, particle velocity and phase difference were numerically simulated. Experiments were also performed to measure the cooling performance of the thermoacoustic cooler under constant electric power supplying to a speaker. Firstly, it was found that, by connecting the bypass-looped tube, the sound field was changed. As the results, the resonance frequency decreased, and the profile of velocity amplitude was shifted in the looped tube. Secondary, thermoacoustic cooling was realized in both of stacks in each looped tube due to thermoacoustic heat pumping effect. The total cooling performance of the proposed the double-loop type thermoacoustic cooler was improved in comparison with the single-loop type thermoacoustic cooler.

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