Miniaturization of Thermoacoustic Cooling System Considering Energy Conversion Efficiency Estimated Using Specific Parameter

概要

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Experimental investigations were performed to miniaturize a loop-tube cooling system. The parameter $\omega\tau$ is regarded as a dimensionless parameter expressing the efficiency of the system’s heat exchange. This parameter is related to the sound generation efficiency and depends on the frequency, stack channel radius and temperature. Both the resonance frequency of the generated sound and $\omega\tau$ are affected by the total loop-tube length. However, the value of $\omega\tau$ can also be controlled by changing the stack channel radius or temperature. Experiments were carried out changing the total loop-tube length under the same constant value of $\omega\tau$. Experimental results confirmed that similar heat exchange efficiencies are obtained when the loop-tube configuration is changed. Therefore, the heat exchange efficiency of the miniature loop-tube can be estimated using large loop-tubes with the same value of $\omega\tau$. Consequently, $\omega\tau$ is a useful and important parameter for designing a miniature loop-tube cooling system.
2008-05-25