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Title: Acoustic cooling engine

Abstract

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

Inventors:
 [1];  [1];  [2];  [2]
  1. (Los Alamos, NM)
  2. (Santa Fe, NM)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
866488
Patent Number(s):
US 4722201
Assignee:
United States of America as represented by United States (Washington, DC) LANL
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
acoustic; cooling; engine; improved; thermal; performance; reduced; internal; losses; comprises; compressible; fluid; contained; resonant; pressure; vessel; substantial; expansion; coefficient; capable; supporting; standing; wave; thermodynamic; element; located; communication; response; pumps; heat; permits; flow; driver; cyclically; drives; location; maximum; impedance; proximate; hot; exchanger; adjacent; conducts; portions; housing; quarter; wavelength; length; coupled; reservoir; diameter; portion; communicating; frequency; continuously; controlled; maintain; resonance; compressible fluid; permits substantial; cooling engine; acoustic cooling; improved thermal; thermal communication; acoustic impedance; expansion coefficient; thermal expansion; pressure vessel; heat exchange; heat exchanger; standing wave; resonant pressure; 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; /62/60/

Citation Formats

Hofler, Thomas J., Wheatley, John C., Swift, Gregory W., and Migliori, Albert. Acoustic cooling engine. United States: N. p., 1988. Web.
Hofler, Thomas J., Wheatley, John C., Swift, Gregory W., & Migliori, Albert. Acoustic cooling engine. United States.
Hofler, Thomas J., Wheatley, John C., Swift, Gregory W., and Migliori, Albert. 1988. "Acoustic cooling engine". United States. doi:. https://www.osti.gov/servlets/purl/866488.
@article{osti_866488,
title = {Acoustic cooling engine},
author = {Hofler, Thomas J. and Wheatley, John C. and Swift, Gregory W. and Migliori, Albert},
abstractNote = {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 quarter 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1988,
month = 1
}

Patent:

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  • A heat-driven acoustic cooling engine having no moving parts receives heat from a heat source. The acoustic cooling engine comprises an elongated resonant pressure vessel having first and second ends. A compressible fluid having a substantial thermal expansion coefficient and capable of supporting an acoustic standing wave is contained in the resonant pressure vessel. The heat source supplies heat to the first end of the vessel. A first heat exchanger in the vessel is spaced-apart from the first end and receives heat from the first end. A first thermodynamic element is adjacent to the first heat exchanger and converts somemore » of the heat transmitted by the first heat exchanger into acoustic power. A second thermodynamic element has a first end located spaced-apart from the first thermodynamic element and a second end farther away from the first thermodynamic element than is its first end. The first end of the second thermodynamic element heats while its second end cools as a consequence of the acoustic power. A second heat exchanger is adjacent to and between the first and second thermodynamic elements. A heat sink outside of the vessel is thermally coupled to and receives heat from the second heat exchanger. The resonant pressure vessel can include a housing less than one-fourth wavelength in length coupled to a reservoir. The housing can include a reduced diameter portion communicating with the reservoir.« less
  • The authors present a heat-driven acoustic cooling engine having no moving parts which receives heat from a heat source. The acoustic cooling engine comprises an elongated resonant pressure vessel having first and second ends. A compressible fluid having a substantial thermal expansion coefficient and capable of supporting an acoustic standing wave is contained in the resonant pressure vessel. The heat source supplies heat to the first end of the vessel. A first heat exchanger in the vessel is spaced-apart from the first end and receives heat from the first end. A first thermodynamic element is adjacent to the first heatmore » exchanger and converts some of the heat transmitted by the first heat exchanger into acoustic power. A second thermodynamic element has a first end located spaced-apart from the first thermodynamic element and a second end farther away from the first thermodynamic element that is its first end.« less
  • An acoustic cooling engine is described comprising: container means for containing a compressible fluid which is capable of supporting and acoustic standing wave having a selected wavelength, the container means having two ends defining a length about half the wavelength of the acoustic standing wave; driver means for cyclically driving the compressible fluid at a frequency corresponding to the selected wavelength, the driver means being positioned at one of the ends of the container means, the one end being a location of maximum acoustical impedance; a thermodynamic element located in the container means and having a first end proximate tomore » the driver means and a second end located further away from the driver means than the first end and defining a length less than one-fourth the wavelength of the acoustic standing wave, the thermodynamic element being thermally responsive to the acoustic standing wave to cause heat to be pumped from the second end to the first end thereby thermally isolating the second end from the driver means; and conductor means for conducting heat away from the first end of the thermodynamic element.« less
  • A gas turbine engine including: an ambient-air cooling circuit (10) having a cooling channel (26) disposed in a turbine blade (22) and in fluid communication with a source (12) of ambient air: and an pre-swirler (18), the pre-swirler having: an inner shroud (38); an outer shroud (56); and a plurality of guide vanes (42), each spanning from the inner shroud to the outer shroud. Circumferentially adjacent guide vanes (46, 48) define respective nozzles (44) there between. Forces created by a rotation of the turbine blade motivate ambient air through the cooling circuit. The pre-swirler is configured to impart swirl tomore » ambient air drawn through the nozzles and to direct the swirled ambient air toward a base of the turbine blade. The end walls (50, 54) of the pre-swirler may be contoured.« less
  • A cooling fan coupling system is described for an engine for an automotive vehicle, the engine comprising a rotating member and a coolant circulation system comprising a coolant radiator, a cooling fan for propelling air past the radiator to cool the coolant radiator, and a thermostatic valve for controlling flow of coolant through the coolant radiator. The thermostatic valve is constituted to start to open at a first determinate coolant temperature value, to be fully opened at a second determinate coolant temperature value, and to be partly opened at a third determinate coolant temperature value and the second determinate coolantmore » temperature value and the second determinate coolant temperature value.« less