High frequency thermoacoustic refrigerator. Annual summary report, 2 September 1993-31 May 1994
A small thermoacoustic refrigerator was developed for operation at 5 kHz. Its main components are a piezoelectric driver of the bimorph type, a cotton wool stack, a 1/2-wave resonator (operated at its 3rd harmonic), and photolithographically processed copper heat exchangers. Tests with air at 1 atmosphere as the working gas produced a temperature difference Delta T across the stack of 32 deg C in 4 seconds for an acoustic power input level of 160 dB. The refrigerator did not have thermal insulation. Improved performance is expected with pressurized helium gas and helium-xenon mixtures. The performance of this refrigerator and its small size make it attractive for applications in high speed electronics and possibly IR detectors.
- Research Organization:
- Utah Univ., Salt Lake City, UT (United States). Dept. of Physics
- OSTI ID:
- 7229955
- Report Number(s):
- AD-A-280925/9/XAB; CNN: N00014-93-J-1126
- Country of Publication:
- United States
- Language:
- English
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