نتایج جستجو برای: thermoacoustic refrigerator

تعداد نتایج: 3383  

2014
Insu Paek James E. Braun Luc Mongeau Ray W. Herrick

The most promising applications for thermoacoustic cooling are investigated from the perspective of the thermodynamic second law efficiency in this paper. A design optimization program interacting with the thermoacoustic simulation program known as DELTAE was developed. Then it was applied to two of the most common configurations for standing-wave thermoacoustic coolers in order to determine th...

Journal: :Entropy 2015
Antonio Piccolo

Abstract: In this paper a simplified two-dimensional computational model for studying the entropy generation characteristics of thermoacoustic heat exchangers with plane fins is presented. The model integrates the equations of the standard linear thermoacoustic theory into an energy balance-based numerical calculus scheme. Relevant computation results are the spatial distribution of the time-av...

2015
S. Di Filippo M. Napolitano R. Dragonetti R. Romano

Introduction The stack is the core of an thermoacoustic standing wave device. In thermoacoustic engines, heat pumps and refrigerators the geometric characteristics of the stack influence the thermodynamic performance. Until now the stack is studied by using viscous and thermal functions that vary with the shape of the pore. However more advantageous general functions can be taken into account t...

2013
Jan A. De Jong Ysbrand H. Wijnant André De Boer

Thermoacoustic engines use heat to produce acoustic power. The subject of this manuscript is modeling of thermoacoustic engines. A finite element simulation has been performed on a theoretical example of a two-dimensional standing wave thermoacoustic engine. The simulation solves the linearized Navier-Stokes equations in the frequency domain. The analysis is used to obtain the (thermo)acoustic ...

2004
Y. Ueda U. Mizutani T. Yazaki

An acoustic field spontaneously induced in a thermoacoustic prime mover consisting of a looped tube and resonator is determined through simultaneously measurements of pressure P and velocity U. A thermal efficiency of the thermoacoustic prime mover of this type has been reported to reach 30%. The measurements of the acoustic field in the present system revealed that a phase lead of U relative t...

2004
Ray Scott Wakeland Robert M. Keolian

A Lagrangian computational method is used to explore the performance of heat exchangers in conditions of oscillating flow and oscillating pressure relevant to thermoacoustic devices. Pressure oscillations cause temperature oscillations within the working gas. Depending on phase, these ‘‘pressure-driven temperature oscillations’’ can enhance or degrade heat transfer within the exchangers of a th...

2013
Jan A. de Jong Ysbrand H. Wijnant André de Boer

Thermoacoustic (TA) heat engines are engines which convert heat into acoustic power. This relatively new class of heat engines gains commercial interest, because of their low number of moving parts and high potential efficiency [1]. Especially traveling wave thermoacoustic engines are capable of reaching this high efficiency, because traveling wave engines perform a thermodynamic cycle similar ...

2014
Kees de Blok

Kees de Blok proposed a “hybrid configuration” travelling wave thermoacoustic engine and his prototype using atmosphere air as the working gas achieved an onset temperature difference as low as 65 K. However, no further research work has been reported on this type of thermoacoustic engine to reveal whether this type of engine can achieve higher efficiency, or how to couple it with acoustic load...

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