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Title: Acoustic cooling engine

An acoustic cooling engine with improved thermal performance and reduced internal losses comprises a compressible fluid contained in a resonant pressure vessel. The fluid has a substantial thermal expansion coefficient and is capable of supporting an acoustic standing wave. A thermodynamic element has first and second ends and is located in the resonant pressure vessel in thermal communication with the fluid. The thermal response of the thermodynamic element to the acoustic standing wave pumps heat from the second end to the first end. The thermodynamic element permits substantial flow of the fluid through the thermodynamic element. An acoustic driver cyclically drives the fluid with an acoustic standing wave. The driver is at a location of maximum acoustic impedance in the resonant pressure vessel and proximate the first end of the thermodynamic element. A hot heat exchanger is adjacent to and in thermal communication with the first end of the thermodynamic element. The hot heat exchanger conducts heat from the first end to portions of the resonant pressure vessel proximate the hot heat exchanger. The hot heat exchanger permits substantial flow of the fluid through the hot heat exchanger. The resonant pressure vessel can include a housing less than one quartermore » wavelength in length coupled to a reservoir. The housing can include a reduced diameter portion communicating with the reservoir. The frequency of the acoustic driver can be continuously controlled so as to maintain resonance.« less
Authors:
 [1] ;  [1] ;  [2] ;  [2]
  1. (Los Alamos, NM)
  2. (Santa Fe, NM)
Publication Date:
OSTI Identifier:
866488
Report Number(s):
US 4722201
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
acoustic; cooling; engine; acoustic; cooling; engine; improved; thermal; performance; reduced; internal; losses; comprises; compressible; fluid; contained; resonant; pressure; vessel; fluid; substantial; thermal; expansion; coefficient; capable; supporting; acoustic; standing; wave; thermodynamic; element; located; resonant; pressure; vessel; thermal; communication; fluid; thermal; response; thermodynamic; element; acoustic; standing; wave; pumps; heat; thermodynamic; element; permits; substantial; flow; fluid; thermodynamic; element; acoustic; driver; cyclically; drives; fluid; acoustic; standing; wave; driver; location; maximum; acoustic; impedance; resonant; pressure; vessel; proximate; thermodynamic; element; hot; heat; exchanger; adjacent; thermal; communication; thermodynamic; element; hot; heat; exchanger; conducts; heat; portions; resonant; pressure; vessel; proximate; hot; heat; exchanger; hot; heat; exchanger; permits; substantial; flow; fluid; hot; heat; exchanger; resonant; pressure; vessel; housing; quarter; wavelength; length; coupled; reservoir; housing; reduced; diameter; portion; communicating; reservoir; frequency; acoustic; driver; continuously; controlled; maintain; resonance; compressible fluid; permits substantial; permits substantial; cooling engine; cooling engine; acoustic cooling; acoustic cooling; improved thermal; thermal communication; thermal communication; acoustic impedance; expansion coefficient; thermal expansion; pressure vessel; pressure vessel; pressure vessel; pressure vessel; pressure vessel; heat exchange; heat exchange; heat exchange; heat exchange; heat exchange; heat exchanger; heat exchanger; heat exchanger; heat exchanger; heat exchanger; standing wave; standing wave; standing wave; resonant pressure; resonant pressure; resonant pressure; resonant pressure; resonant pressure; thermodynamic element; thermodynamic element; thermodynamic element; thermodynamic element; thermodynamic element; thermodynamic element; quarter wavelength; thermal performance; reduced diameter; continuously controlled; fluid contained; substantial thermal; diameter portion; thermal response; element permits; quarter wave; losses comprises; acoustic driver; acoustic driver /62/60/