Journal ArticleDOI
A gas-spring system for optimizing loudspeakers in thermoacoustic refrigerators
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TLDR
In this paper, a gas-spring system is introduced as a practical tool to shift the mechanical resonance frequency of a moving-coil speaker to match the acoustic frequency of the resonator.Abstract:
Moving-coil loudspeakers are appropriate drivers for thermoacoustic refrigeration. They are cheap, commercially available, compact, light, and can be adapted to meet specific requirements. This paper deals with the optimization of loudspeakers for thermoacoustic refrigeration. Using an electrical model that describes the refrigerator, it is concluded that the electroacoustic efficiency can be maximized over a wider frequency range by matching the mechanical resonance frequency of the driver to the acoustic resonance frequency of the resonator. A gas-spring system is introduced as a practical tool to shift the mechanical resonance frequency of the driver. An electroacoustic efficiency of 35% is obtained when the mechanical resonance frequency of the driver and the acoustic resonance frequency are equal. Additionally, the efficiency is constant over a relatively wide frequency range. This has advantages for thermoacoustic refrigeration. During cool-down, the operating acoustic frequency decreases so that the refrigerator will keep near the optimum performance.read more
Citations
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Journal ArticleDOI
Design of thermoacoustic refrigerators
TL;DR: The design strategy described in this paper is a guide for the design and development of thermoacoustic coolers and the optimization of the different parts of the refrigerator will be discussed.
Journal ArticleDOI
Construction and performance of a thermoacoustic refrigerator
TL;DR: In this paper, the authors describe the construction and performance of a thermoacoustic refrigerator, which consists of three major parts: the refrigerator, the electronic apparatus necessary for the measurements and acquisition of the experimental data, and the gas-control panel which is used to fill and purge the system and to prepare gas mixtures.
Journal ArticleDOI
Acoustic coupling between the loudspeaker and the resonator in a standing-wave thermoacoustic device
TL;DR: In this paper, a comparison between such a coupling and measurements obtained in a large-scale thermo-acoustic resonator constructed at the University of Manchester is made, and it is shown that a good agreement is obtained for small amplitudes and this progressively worsens as the amplitude is increased.
Journal ArticleDOI
Design and analysis of thermoacoustic refrigerator
TL;DR: In this paper, the authors deal with the design and analysis of a quarter-wavelength, 10 W capacity, thermoacoustic refrigerator using short stack boundary layer approximation assumptions, and the effect of operating frequency on the performance of the refrigerator is studied using dimensional normalization technique.
Journal ArticleDOI
Theoretical evaluation of loudspeaker for a 10 watts cooling power thermoacoustic refrigerator
TL;DR: In this article, a design of moving coil loudspeaker for a 10 W cooling power thermo-acoustic refrigerator is presented, where the gas spring system for matching the frequency of the commercially available loudspeaker with the acoustic resonator tube for maximizing electro-acoustical efficiency of the loudspeaker is discussed.
References
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Journal ArticleDOI
Encyclopedia of Applied Physics
TL;DR: The 23-volume "Encyclopedia of Applied Physics" seeks to demonstrate the synergy between physics and technological applications as discussed by the authors, and provides a broad overview of the main aspects of physics and their applications.
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An intrinsically irreversible thermoacoustic heat engine
TL;DR: In this article, the properties of a heat engine that is intrinsically irreversible in the sense that it requires thermal lags for its operation are analyzed quantitatively using a second-order thermoacoustic theory based on the work of Rott.
Journal ArticleDOI
Thermoacoustic Refrigerator for Space Applications
TL;DR: The Space ThermoAcoustic Refrigerator (STAR) as mentioned in this paper is a spacequalified thermoacoustic refrigerator that uses resonant high-amplitude sound waves in inert gases to pump heat.
Journal ArticleDOI
Construction and performance of a thermoacoustic refrigerator
TL;DR: In this paper, the authors describe the construction and performance of a thermoacoustic refrigerator, which consists of three major parts: the refrigerator, the electronic apparatus necessary for the measurements and acquisition of the experimental data, and the gas-control panel which is used to fill and purge the system and to prepare gas mixtures.
Journal ArticleDOI
Use of electrodynamic drivers in thermoacoustic refrigerators
TL;DR: Some issues involved in matching electrodynamic drivers to thermoacoustic refrigerators are examined using an equivalent circuit model and it is concluded that the driver should be chosen to have a large product and the piston area should be selected to maximize electroacoustic efficiency.