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Title: Thermoacoustic refrigerator

A thermoacoustic device having a thermal stack made from a piece of porous material which provides a desirable ratio of thermoacoustic area to viscous area, which has a low resistance to flow, which minimizes acoustic streaming and which has a high specific heat and low thermal conductivity is disclosed. The thermal stack is easy and cheap to form and it can be formed in small sizes. Specifically, in one embodiment, a thermal stack which is formed by the natural structure of a porous material such as reticulated vitreous carbon is disclosed. The thermal stack is formed by machining a block of reticulated vitreous carbon into the required shape of the thermal stack. In a second embodiment, a micro-thermoacoustic device is disclosed which includes a thermal stack made of a piece of porous material such as reticulated vitreous carbon. In another embodiment, a heat exchanger is disclosed which is formed of a block of heat conductive open cell foam material.
Inventors:
 [1]
  1. (San Mateo, CA)
Issue Date:
OSTI Identifier:
871165
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5673561
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
thermoacoustic; refrigerator; device; thermal; stack; piece; porous; material; provides; desirable; ratio; viscous; resistance; flow; minimizes; acoustic; streaming; specific; heat; conductivity; disclosed; easy; cheap; form; formed; sizes; specifically; embodiment; natural; structure; reticulated; vitreous; carbon; machining; block; required; shape; micro-thermoacoustic; exchanger; conductive; cell; foam; vitreous carbon; specific heat; cell foam; foam material; porous material; thermal conductivity; heat exchange; heat exchanger; heat conductive; acoustic refrigerator; /62/