Piezo-driven thermoacoustic refrigerators with dynamic magnifiers

Thermoacoustic refrigeration is an emerging cooling technology which does not rely for in its operation on the use of any moving parts or harmful refrigerants. This technology uses acoustic waves to pump heat across a temperature gradient. The temperature gradient forms across the ends of a porous b...

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Published inApplied acoustics Vol. 83; pp. 86 - 99
Main Authors Nouh, M., Aldraihem, O., Baz, A.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.09.2014
Elsevier
Subjects
Acoustics
Applied sciences
Cryogenics
Dynamic magnification
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
Piezo-driven
Refrigerating engineering. Cryogenics. Food conservation
Thermoacoustic refrigerator
Transduction; acoustical devices for the generation and reproduction of sound
Thermoacoustic refrigerator
Dynamic magnification
Piezo-driven
Piezoelectric device
Theoretical study
Thermoacoustic effect
Experimental study
Loudspeaker
Performance
Refrigeration
Online AccessGet full text
ISSN0003-682X
1872-910X
DOI10.1016/j.apacoust.2014.02.017

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Abstract Thermoacoustic refrigeration is an emerging cooling technology which does not rely for in its operation on the use of any moving parts or harmful refrigerants. This technology uses acoustic waves to pump heat across a temperature gradient. The temperature gradient forms across the ends of a porous body, called the stack, enclosed in a resonator. The vast majority of thermoacoustic refrigerators to date have used electromagnetic loudspeakers to generate the acoustic input. In this paper, the design, construction, operation, and modeling of a piezo-driven thermoacoustic refrigerator are detailed. The performance of the refrigerator is significantly enhanced by coupling the acoustic driver with an elastic structure, referred to as a dynamic magnifier. Proper selection of the magnifier parameters can increase the magnitude of the pressure oscillations across the stack, and consequently the temperature difference. The magnified refrigerator demonstrates the effectiveness of piezoelectric actuation in moving 0.3W of heat across a 10°C temperature difference with an input power of 7W. All the theoretical predictions are validated against data from experimental prototypes. The developed theoretical and experimental tools can serve as invaluable means for the design and testing of piezo-driven thermoacoustic refrigerator configurations.
AbstractList Thermoacoustic refrigeration is an emerging cooling technology which does not rely for in its operation on the use of any moving parts or harmful refrigerants. This technology uses acoustic waves to pump heat across a temperature gradient. The temperature gradient forms across the ends of a porous body, called the stack, enclosed in a resonator. The vast majority of thermoacoustic refrigerators to date have used electromagnetic loudspeakers to generate the acoustic input. In this paper, the design, construction, operation, and modeling of a piezo-driven thermoacoustic refrigerator are detailed. The performance of the refrigerator is significantly enhanced by coupling the acoustic driver with an elastic structure, referred to as a dynamic magnifier. Proper selection of the magnifier parameters can increase the magnitude of the pressure oscillations across the stack, and consequently the temperature difference. The magnified refrigerator demonstrates the effectiveness of piezoelectric actuation in moving 0.3W of heat across a 10°C temperature difference with an input power of 7W. All the theoretical predictions are validated against data from experimental prototypes. The developed theoretical and experimental tools can serve as invaluable means for the design and testing of piezo-driven thermoacoustic refrigerator configurations.
Author Baz, A.
Nouh, M.
Aldraihem, O.
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Keywords Thermoacoustic refrigerator
Dynamic magnification
Piezo-driven
Piezoelectric device
Theoretical study
Thermoacoustic effect
Experimental study
Loudspeaker
Performance
Refrigeration
Language English
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Snippet Thermoacoustic refrigeration is an emerging cooling technology which does not rely for in its operation on the use of any moving parts or harmful refrigerants....
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SubjectTerms Acoustics
Applied sciences
Cryogenics
Dynamic magnification
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
Piezo-driven
Refrigerating engineering. Cryogenics. Food conservation
Thermoacoustic refrigerator
Transduction; acoustical devices for the generation and reproduction of sound
Title Piezo-driven thermoacoustic refrigerators with dynamic magnifiers
URI https://dx.doi.org/10.1016/j.apacoust.2014.02.017
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