Journal ArticleDOI
Cool sound: the future of refrigeration? Thermodynamic and heat transfer issues in thermoacoustic refrigeration
Cila Herman,Zdeněk Trávníček +1 more
TLDR
The paper addresses some of the thermodynamic and heat transfer issues relevant in improving the performance of the thermoacoustic system, such as optimization for maximum COP, maximum cooling load and the role of the heat exchangers.Abstract:
During the past two decades the thermoacoustic refrigeration and prime mover cycles gained importance in a variety of refrigeration applications. Acoustic work, sound, can be used to generate temperature differences that allow the transport of heat from a low temperature reservoir to an ambient at higher temperature, thus forming a thermoacoustic refrigeration system. The thermoacoustic energy pumping cycle can also be reversed: temperature difference imposed along the stack plates can lead to sound generation. In this situation the thermoacoustic system operates as a prime mover. Sound generated by means of this thermoacoustic energy conversion process can be utilized to drive different types of refrigeration devices that require oscillatory flow for their operation, such as thermoacoustic refrigerators, pulse tubes and Stirling engines. In order for a thermoacoustic refrigeration or prime mover system as well as a thermoacoustic prime mover driving a non-thermoacoustic refrigeration system to be competitive on the current market, it has to be optimized in order to improve its overall performance. Optimization can involve improving the performance of the entire system as well as its components. The paper addresses some of the thermodynamic and heat transfer issues relevant in improving the performance of the thermoacoustic system, such as optimization for maximum COP, maximum cooling load and the role of the heat exchangers. Results obtained using the two optimization criteria are contrasted in the paper to illustrate the complexity of the optimization process.read more
Citations
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Journal ArticleDOI
Distillation technology - still young and full of breakthrough opportunities
TL;DR: A broad overview of the recent developments in distillation based on process intensification principles, for example heat pump assisted distillation (e.g. vapor compression or compression-resorption), heat-integrated distillation column, membrane distillation, HiGee distillation and cyclic distillation are discussed in the context of changes towards a more energy efficient and sustainable chemical process industry.
Journal ArticleDOI
CFD simulation of a thermoacoustic engine with coiled resonator
TL;DR: In this paper, the effect of resonator curvature on the thermoacoustic effect is explored. But the authors focus on a single resonator, and do not consider the curvature of the resonator itself.
Journal ArticleDOI
Environmental motivation to switch to thermoacoustic refrigeration
TL;DR: In this article, the benefits of this technology with a consideration of its Total Equivalent Warming Impact (TEWI) compared to conventional cooling in vehicles, which is shown to be a potential target application.
Journal ArticleDOI
Thermoacoustic heat engine modeling and design optimization
TL;DR: In this paper, a mathematical programming model is developed to optimize the performance of a simple TAE with respect to several acoustic and thermal objectives, including work output, viscous losses and heat losses.
Journal ArticleDOI
Halbach array linear alternator for thermo-acoustic engine
TL;DR: In this paper, the design issues of a thermo-acoustically driven low-cost linear alternator for the SCORE project are discussed and compared with the simulation results.
References
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Book
Fundamentals of Heat and Mass Transfer
TL;DR: This paper introduced the physical effects underlying heat and mass transfer phenomena and developed methodologies for solving a variety of real-world problems, such as energy minimization, mass transfer, and energy maximization.
Proceedings Article
Thermoacoustic engines
W. P. Arnott,R. Raspet,H.E. Bass +2 more
TL;DR: In this paper, an approximate analysis of energy flow and acoustical measurements of a thermoacoustic prime mover with arbitrary cross-sectional geometry is given. But this analysis is restricted to the case of TAEs with circular or parallel slit pore geometry.
Journal ArticleDOI
Thermoacoustic Engines and Refrigerators
TL;DR: The combination of all these oscillations, and their interaction with solid boundaries, produces a rich variety of “thermoacoustic” effects, such as temperature oscillations always accompany the pressure changes as mentioned in this paper.
Journal ArticleDOI
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
Understanding some simple phenomena in thermoacoustics with applications to acoustical heat engines
TL;DR: In this paper, the authors describe how, by the use of suitable acoustical structures, the phenomena can both be simplified and readily demonstrated, and a heuristic discussion is emphasized, which will be useful in teaching the principles.