Thermoacoustic Refrigeration

Disclaimer
THIS INFORMATION WAS PRESENTED AT AN ASHRAE SEMINAR HELD
AT THE 2003 SUMMER MEETING IN KANSAS CITY, MO. THE SEMINAR
FORMAT IS TO PRESENT INFORMATION OF CURRENT INTEREST AND
TO PROVIDE A VENUE FOR INTERACTION BETWEEN ASHRAE
MEMBERS. THESE SEMINARS SHOULD NOT BE CONSIDERED PEERREVIEWED
(OR THE FINAL WORD ON ANY SUBJECT). ASHRAE HAS
NOT INVESTIGATED, AND ASHRAE EXPRESSLY DISCLAIMS ANY DUTY
TO INVESTIGATE ANY PRODUCT, SERVICE, PROCESS, PROCEDURE,
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advantages and disadvantages of thermoacoustic refrigeration pdf

Thermoacoustic engines (sometimes called TA engines) are thermoacoustic devices which use high-amplitude sound waves to pump heat from one place to another, or conversely use a heat difference to induce high-amplitude sound waves. In general, thermoacoustic engines can be divided into standing wave and travelling wave devices. These two types of thermoacoustics devices can again be divided into two thermodynamic classes, a prime mover (or simply heat engine), and a heat pump. T ....etc

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DESIGN AND DEVELOPMENT OF HIGH-FREQUENCY THERMOACOUSTIC ENGINES FOR THERMAL MANAGEMENT IN MICROELECTRONICS
SEMINAR REPORT
Submitted by
VIBIN KOSHY THOMAS
S7-ME
Department Of Mechanical Engineering
College of Engineering, Thiruvananthapuram 16
OCTOBER 2010




ABSTRACT

Thermoacoustic heat engines provide a practical solution to the problem of heat management in microcircuits where they can be used to pump heat or produce spot cooling of specific circuit elements. There are basic ....etc

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Thermoacoustic Stirling Engines
Abstract:
Sound waves in thermoacoustic engines and refrigerators can replace the pistons and cranks that are typically built into such machinery. Over the past two decades, physicists and engineers have been working on a class of heat engines and compression-driven refrigerators that use no oscillating pistons, oil seals or lubricants. These so-called thermoacoustic devices take advantage of sound waves reverberating within them to convert a temperature differential into mechanical ene ....etc

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Thermoacoustic engines (sometimes called TA engines) are thermoacoustic devices which use high-amplitude sound waves to pump heat from one place to another, or conversely use a heat difference to induce high-amplitude sound waves. In general, thermoacoustic engines can be divided into standing wave and travelling wave devices. These two types of thermoacoustics devices can again be divided into two thermodynamic classes, a prime mover (or simply heat engine), and a heat pump. The prime mover creates work using heat, whereas a heat pump create ....etc

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Thermoacoustic Refrigeration



How it works

Moving coil Loudspeaker
Inside 2 magnets with metal coil between them, current is induced causing coil to move
Creates sound waves up to 200 dB!
Resonator where gas cooling and compression take place
Uses inert gas, commonly Helium
Stack
Series of small parallel channels through which pressure and velocity of waves change
In between the heat exchangers
Heat Exchangers
Hot heat exchanger to remove excess heat
Cold heat exch ....etc

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ABSTRACT
Thermo acoustic have been known for over years but the use of this phenomenon to develop engines and pumps is fairly recent. Thermo acoustic refrigeration is one such phenomenon that uses high intensity sound waves in a pressurized gas tube to pump heat from one place to other to produce refrigeration effect. In this type of refrigeration all sorts of conventional refrigerants are eliminated and sound waves take their place. All we need is a loud speaker and an acoustically insulated tube. Also this system complet ....etc

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