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Experimental Study of the Performance of the Air-Based Standing Wave Thermoacoustic Refrigerator Using Parallel Wave Stack

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Abstract

The novelty of this work is a new type of stack, namely, the parallel wave stack (PWS). In this paper, we study the performance of an air-based standing wave thermoacoustic refrigerator using the PWS. We use small heat pipes with a heat transfer rate of approximately 30 W as heat exchangers for the system. We investigate the effect of the ratio of stack length (Ls) to the distance between stack center and reflector (Xs) on the performance of the refrigerator parallel wave stacks with a blockage ratio (BR) of 67 %, 71 %, and 74 %, and with Ls/Xs ratios of 0.74, 0.96, and 1.20. We tested and compared these under a cooling load (Qc) of 0.5 W to 2 W and a frequency of 150 Hz. The results show that a BR of 71% with an Ls/Xs ratio of 0.96 provides a minimum cold-side temperature (Tc), and a maximum temperature difference (ΔTm), a maximum coefficient of performance, and a maximum relative coefficient of performance. This new type of stack can provide a higher performance. The structure of the stack is also stronger than others. This stack is an alternative and can be used in a thermoacoustic refrigerator. The results obtained from the present study will be very useful for improving the performance of the thermoacoustic refrigerator in the future.

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Data Availability

Data sharing not applicable to this article as no datasets were generated or analyzed during the study. We do not wish to share our data at this moment because the next step of this research is going on and would like to keep the data until the project is finished.

Abbreviations

As :

Heat transfer area (m2)

PWS:

Parallel wave stack

BR:

Blockage ratio (%)

Qc :

Cooling load (W)

COP:

Coefficient of performance

TAR:

Thermoacoustic refrigerator

COPc:

Carnot coefficient of performance

Tc :

Cold-side temperature (°C)

COPR:

Relative coefficient of performance

Th :

Hot-side temperature (°C)

Ei :

Electrical input voltage (V)

Xs :

Distance between stack center and reflector (m)

f:

Frequency (Hz)

Ii :

Electrical input current (A)

Ls :

Stack length (m)

ρm :

Mean density (kg·m3)

Pi :

Electrical input power (W)

ΔTm :

Temperature difference (°C)

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Acknowledgments

The authors acknowledge the National Research Council of Thailand (NRCT) for the Research and Researchers Funds for Industries (RRI), Mr. Thunyawat Chittiphalungsri from Saijo Denki International Co. Ltd., the NSTDA for the Research Chair Grant, and the Thailand Science Research and Innovation (TSRI) for Fundamental Fund 2022.

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Correspondence to Somchai Wongwises.

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Chaiwongsa, P., Wongwises, S. Experimental Study of the Performance of the Air-Based Standing Wave Thermoacoustic Refrigerator Using Parallel Wave Stack. Int J Thermophys 43, 152 (2022). https://doi.org/10.1007/s10765-022-03070-5

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