Results 71 to 80 of about 132 (123)
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Prandtl number and thermoacoustic refrigerators
The Journal of the Acoustical Society of America, 2002From kinetic gas theory, it is known that the Prandtl number for hard-sphere monatomic gases is 2/3. Lower values can be realized using gas mixtures of heavy and light monatomic gases. Prandtl numbers varying between 0.2 and 0.67 are obtained by using gas mixtures of helium–argon, helium–krypton, and helium–xenon.
Tijani, M.E.H. +2 more
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An experimental thermoacoustically driven thermoacoustic refrigerator
The Journal of the Acoustical Society of America, 1996The construction of a thermoacoustically (heat) driven, thermoacoustic refrigerator (TADTAR) is nearing completion. The design utilizes a novel resonator topology and high-efficiency primary heat exchangers. Numerical models suggest a cooling power level of at least 500 W over a temperature span of 40 °C.
Thomas J. Hofler +3 more
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A Study of Thermoacoustic Refrigerator
SAE Technical Paper Series, 2017<div class="section abstract"><div class="htmlview paragraph">A diesel engine is advantageous in its high thermal efficiency, however it still wastes about 50% of total input energy to exhaust and cooling losses. A feasibility study of thermoacoustic refrigerator was carried out as one of the means to recuperate waste heat.
Masaaki Nakamura +2 more
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Thermoacoustic refrigeration demonstration
The Journal of the Acoustical Society of America, 1998A portable device for demonstrating thermoacoustic cooling is developed using off-the-shelf components: the Morel MW-142 5-in. woofer and the Selenium HL14-25 horn. Acoustic peak pressure amplitudes of 19 kPa (19% of mean pressure) have been measured (without stack) using atmospheric air as the working fluid.
Ray Scott Wakeland, Steven L. Garrett
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Thermoacoustic Refrigeration Device
2009 Asia-Pacific Power and Energy Engineering Conference, 2009A thermoacoustic refrigeration device (TAR) includes an acoustic wave generation device arranged directed to the channel of a hollow tube, and a regenerator provided at a predetermined position in the channel of the tube. A temperature gradient is obtained across the regenerator by an acoustic wave emitted from the acoustic wave generation device ...
E. Qing +3 more
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Experimental study and analysis of a thermoacoustically driven thermoacoustic refrigerator
Sādhanā, 2020Experimental investigations are performed on a half-wavelength standing wave type thermoacoustically driven thermoacoustic refrigerator also known as TADTAR. Present TADTAR device conceived to be a quarter wavelength standing wave type thermoacoustic engine (TAE) coupled to a quarter wavelength standing wave thermoacoustic refrigerator (TAR).
A B DESAI +3 more
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Design of thermoacoustic refrigerators
Cryogenics, 2002in this paper the design of thermoacoustic refrigerators. using the linear thermoacoustic theory, is described. Due to the large number of parameters, a choice of some parameters along with dimensionless independent variables will be introduced. The design strategy described in this paper is a guide for the design and development of thermoacoustic ...
Tijani, M.E.H. +2 more
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Improvements in an experimental thermoacoustically driven thermoacoustic refrigerator
The Journal of the Acoustical Society of America, 1997A thermoacoustically (heat) driven, thermoacoustic refrigerator apparatus, having a novel topology, has produced significant cooling power and efficiency. It has achieved a cooling temperature span of 60 °C, and 91 W of cooling power at a span of 25 °C, with an overall COP of 0.15. These numbers were produced with a porous carbon refrigerator stack and
Thomas J. Hofler, Jay A. Adeff
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The optimal stack spacing for thermoacoustic refrigeration
The Journal of the Acoustical Society of America, 2002The characteristic pore dimension in the stack is an important parameter in the design of thermoacoustic refrigerators. A quantitative experimental investigation into the effect of the pore dimensions on the performance of thermoacoustic devices is reported. Parallel-plate stacks with a plate spacing varying between 0.15 and 0.7 mm are manufactured and
Tijani, M.E.H. +2 more
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Condensation in a steady-flow thermoacoustic refrigerator
The Journal of the Acoustical Society of America, 2000Condensation may occur in an open-flow thermoacoustic cooler with stack temperatures below the saturation temperature of the flowing gas. In the experimental device described here the flowing gas, which is also the acoustic medium, is humid air, so the device acts as a flow-through dehumidifier. The humid air stream flows through an acoustic resonator.
R A, Hiller, G W, Swift
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