A New Approach for Thermoacoustic Refrigeration
We suggest a new design configuration for thermoacoustic refrigeration that optimizes the refrigeration effect caused by both the standing wave and the traveling wave. In current thermoacoustic refrigerators the refrigeration effect comes mainly from the standing wave component, in which the phase angle between the pressure and the velocity is 90°. In the orifice pulse tube refrigerator the refrigeration effect comes from the traveling wave component, in which the pressure and the velocity are in phase. By combining these two devices and optimizing the refrigeration effect caused by both the traveling wave and the standing wave components, we may be able to extend the temperature range of the thermoacoustic refrigerator down to the cryogenic range. The resulting device is a thermoacoustic refrigerator with an orifice pulse tube as a cold end expander, or an orifice pulse tube cooler operating near the resonance condition. The new design configuration may have a higher efficiency than that of the orifice pulse tube refrigerator or the thermoacoustic refrigerator in the intermediate temperature range. Another advantage over the pulse tube is the ability to use a driver with a small displacement, since the device is operating near resonance. This paper will discuss the working process, the new configuration, and some preliminary modeling results of the new type of thermoacoustic refrigerator.
KeywordsPhase Angle Standing Wave Wave Component Design Configuration Pulse Tube
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