Results 131 to 140 of about 1,140 (167)
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Miniaturation of thermoacoustic refrigerators
The Journal of the Acoustical Society of America, 2008The possibility to miniature thermoacoustic refrigerators is theoretically investigated. Both standing-wave and traveling-wave systems are considered. In the consideration of standing-wave refrigerators, a system consisting of a resonator tube (50 cm) with a closed end and a PVC stack (length 5 cm) is taken as a reference.
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Sensorless control of a thermoacoustic refrigerator
The Journal of the Acoustical Society of America, 2004A method for commanding the frequency of the signal that drives an electrodynamic sound source to maintain the coupled thermoacoustic resonator at its resonance frequency is described. The method uses only the current and voltage applied to the source terminals to select the operating frequency, thereby eliminating the need for pressure and ...
Tony L. Shearer +3 more
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Redesign of a small thermoacoustic refrigerator
The Journal of the Acoustical Society of America, 2000At the Fall 1999 meeting of the Acoustical Society of America, the design and initial performance of a small, electrically powered thermoacoustic refrigerator was presented. The refrigerator has nominal dimensions of 5 in. long and 1 in. diameter with a target of 10 W of cooling over a 25<th>°C temperature span using 2-bar helium as the ...
Tamra S. Underwood +3 more
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Application of thermoacoustic effect to refrigeration
Review of Scientific Instruments, 2003Thermoacoustic effect, as a subprocess of the photoacoustic effect, can also convert heat to acoustic wave by a thermoacoustic prime mover, and can also pump heat by acoustic wave in a thermoacoustic refrigerator. The present study focuses on a thermoacoustically driven pulse tube refrigerator, utilizing sound from a thermoacoustic prime mover to drive
T. Jin +3 more
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Thermoacoustic Refrigerator’s Stack Optimization
AIP Conference Proceedings, 2010The standing wave thermoacoustic refrigerator, which uses sound generation to transfer heat, was developed rapidly during the past four decades. It was regarded as a new, promising and environmentally benign alternative to conventional compression vapor refrigerators, although it was not competitive regarding the coefficient of performance (COP) yet ...
Mawahib Hassan El-Fawal +7 more
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Thermoacoustic refrigerator for space applications
The Journal of the Acoustical Society of America, 1989Long-lived, space-based cryocoolers with low vibration levels are necessary in a variety of applications, including the cooling of infrared sensors and high Tc superconductors. A thermoacoustic refrigerator designed to function autonomously in a Space Shuttle Get Away Special (GAS) canister will be described that has no sliding seals and oldy 15 gm of ...
S. L. Garrett +8 more
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Thermoacoustic life sciences refrigerator
The Journal of the Acoustical Society of America, 1993This thermoacoustic refrigerator is being built to preserve biological samples (blood, urine, etc.) during Space Shuttle operations. It employs two high-power electrodynamic drivers capable of generating 60 W of acoustic power each, two ‘‘stacks,’’ and four internal heat exchangers in order to produce 700 BTU/h (205 W) of cooling in the refrigerator ...
Steven L. Garrett +3 more
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2014
Alternative Fluorocarbons Environmental Acceptability ...
Garrett, Steven L. +2 more
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Alternative Fluorocarbons Environmental Acceptability ...
Garrett, Steven L. +2 more
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Experimental studies on thermoacoustic refrigeration
The Journal of the Acoustical Society of America, 1996Thermoacoustic refrigeration phenomena in a resonance tube were studied experimentally. A horizontal brass tube of 400 mm in length and 40 mm in diameter was closed at one end and attached to the acoustic driver (audio speaker) at the other end. Atmospheric air was enclosed in the tube as a working fluid.
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Thermoacoustic–Stirling model refrigerator
The Journal of the Acoustical Society of America, 2001The design and performance of a model refrigerator that uses a stainless-steel woven regenerator (4.1 cm diameter, 5.0 mm thick) and an unconventional Helmholtz resonator to provide proper phasing for the regenerator are described. Cooling is produced in air at atmospheric pressure with sound pressures in excess of 6 kPa in a transparent 60 cm long ...
Matthew E. Poese, Steven L. Garrett
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