Refrigeration – Refrigeration producer
Patent
1989-09-26
1990-09-04
Capossela, Ronald C.
Refrigeration
Refrigeration producer
60721, F25B 100
Patent
active
049533665
ABSTRACT:
An acoustic cryocooler with no moving parts is formed from a thermoacoustic driver (TAD) driving a pulse tube refrigerator (PTR) through a standing wave tube. Thermoacoustic elements in the TAD are spaced apart a distance effective to accommodate the increased thermal penetration length arising from the relatively low TAD operating frequency in the range of 15-60 Hz. At these low operating frequencies, a long tube is required to support the standing wave. The tube may be coiled to reduce the overall length of the cryocooler. One or two PTR's are located on the standing wave tube adjacent antinodes in the standing wave to be driven by the standing wave pressure oscillations. It is predicted that a heat input of 1000 W at 1000 K will maintian a cooling load of 5 W at 80 K.
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John C. Wheatley et al., "The Natural Heat Engine," 14 Los Alamos Science No. 14, pp. 1-33 (8/1986).
Ray Radebaugh, "Pulse Tube Refrigeration-A New Type of Cryocooler," 26 Jpn. J. Appl. Phys., Suppl. 26-3, pp. 2076 (9/1987).
G. W. Swift, "Thermoacoustic Engines," 84 J. Acoust. Soc. Am. No. 4, pp. 1145-1180 (Oct. 1988).
Martin Richard A.
Radenbaugh Ray
Swift Gregory W.
Capossela Ronald C.
Gaetjens Paul D.
Moser William R.
The United States of America as represented by the United States
Wilson Ray G.
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