High Frequency Thermoacoustic Refrigerator.
Final rept. 15 Sep 93-14 Sep 96,
UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS
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The design, development, and tests of a high frequency thermoacoustic refrigerator are presented. It was developed to operate at 5000 Hz with a piezoelectric driver and air at 1 atmosphere. The stack is unusual in that it is made of random fibers which can provide an enormous surface area for interaction, with the sound field. At each end of the stack heat was transferred using copper heat exchangers. A temperature difference of 50 C was produced for sound levels of 160 dB at the stack The cooling power of this device was in the range of 0.4 to 1 watt. High frequency operation leads to a large critical temperature gradient across the stack of l25 deg Ccm, which opens up the possibility of producing very low temperatures in suitable geometries. The impressive performance of our device demonstrates its potential for refrigeration of small objects, such as high speed electronic components and biologica samples. The device is compact 3.5 cm long, simple, and it can be interfaced to microelectronics for heat removal applications.
- Air Conditioning, Heating, Lighting and Ventilating