A highly efficient heat-driven thermoacoustic cooling system: Detailed study

Xiao, Lei; Luo, Kaiqi; Zhao, Dong; Wu, Zhanghua; Xu, Jingyuan; Luo, Ercang

doi:10.1016/j.energy.2024.130610

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…The mismatching can increase losses and deteriorate efficiency. This anomalous phenomenon has been found in our previous studies, [20][21][22] which is also demonstrated by the declined blue column in Figure 2A with elevated heating temperatures beyond 200 °C.…”

Section: ẇAcoutsupporting

confidence: 86%

Sustainable heat-driven sound cooler with super-high efficiency

Xiao,

Luo,

et al. 2024

The Innovation Energy

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<p>Sustainable cooling technologies with high efficiency are increasingly vital in modern life. Characterized by eco-friendly working substances and no mechanical moving components, the heat-driven thermoacoustic refrigerator (HDTR) makes it a really sustainable choice. However, its practical application has been hindered by its relatively low efficiency. This work reports a breakthrough in thermally-powered sound cooling technology: a super-efficient HDTR. The system incorporates an innovative configuration, ensuring efficient acoustic power matching between the engine and cooler units at high heating temperatures, thereby significantly boosting efficiency. Our experimental findings are exhilarating: the HDTR achieves an unprecedented coefficient of performance (COP) of 1.34 at heating, ambient, and cooling temperatures of 550 ��C, 35 ��C, and 7 ��C, respectively, along with a cooling power of 2.37 kW. To the best of our knowledge, under approximate temperature spans, this COP surprisingly increases by 240% compared to the best result previously reported for HDTRs without using the novel configuration. These results represent a significant advancement in HDTR technology, showing a tremendous potential of the HDTR as an emerging, sustainable cooling technology, particularly for heat-driven room-temperature refrigeration applications.</p>

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Section: ẇAcoutsupporting

confidence: 86%

Sustainable heat-driven sound cooler with super-high efficiency

Xiao,

Luo,

et al. 2024

The Innovation Energy

Self Cite

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“…These result to a system with better efficiency, a distinct advantage over the conventional thermoacoustic systems. The improvements made in the thermoacoustic system can be seen in the context of improved performance in low temperature at different system operation, higher pressure amplitudes, and innovative designs [11]. Consequently, these systems hold promise for a variety of applications, including low-grade heat recovery and residential air conditioning systems.…”

Section: Introductionmentioning

confidence: 99%

Vibration-Induced Flow and Streaming in Oscillatory Flow of Thermoacoustics

Azman Hafiidz Aji,

Fatimah Al Zahrah Mohd Saat,

Fadhilah Shikh Anuar

et al. 2024

ARFMTS

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Induced acoustic streaming flow in thermoacoustic systems occurs due to acoustic vibrations, causing changes to the mean flow in the systems. This phenomenon creates a tendency to generate net fluid flow that can cause energy change within certain areas inside the system. However, the effects of the entire system’s vibrations on the flow streaming are not yet fully understood, yet it is important for a more effective operation. This study experimentally investigated the flow streaming resulting from vibration in a standing-wave thermoacoustic test rig with a flow frequency of 23.6 Hz. The existence of flow streaming due to vibration which was not counted in the theoretical formula is shown and indicated by experimental values. The result shows that there is a correlation between the amplitude of the drive ratio (DR) and the velocity of the oscillation of the flow. Upon examining both the theoretical and the practical evidence, it becomes clear that there exists a marginal flow velocity in directions other than the main flow due to the vibration of resonator’s wall as measured at the intake and outflow areas of the stack. This marginal flow velocity amplifies as the drive ratio of flow increases and it may potentially explain the observed difference between measured flow amplitude and the theoretical value.

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Impedance matching for investigating operational conditions in thermoacoustic Stirling fluidyne

Hsu,

Liao

2024

Applied Energy

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A highly efficient heat-driven thermoacoustic cooling system: Detailed study

Cited by 7 publications

References 25 publications

Sustainable heat-driven sound cooler with super-high efficiency

Sustainable heat-driven sound cooler with super-high efficiency

Vibration-Induced Flow and Streaming in Oscillatory Flow of Thermoacoustics

Impedance matching for investigating operational conditions in thermoacoustic Stirling fluidyne

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