Thermo Acoustic Engines

abstract

Environmental priorities are forcing chloro -fluorocarbons out of market place thereby creating a new demand for cooling technologies. This paper presents an outcome of researches done to design, construct and evaluate a CFC free refrigeration system. A prototype Thermo acoustic cooling system utilizing high amplitude sound waves in an inert gas is discussed.

Thermo Acoustic Engines
A thermo acoustic engine converts some heat from a high Temperature heat source into acoustic power rejecting was ....etc

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Thermo acoustic Refrigeration is based on the principles of creation of temperature gradient from sound waves and this theory was first developed in 1960s. Unlike vapour compression system, Thermo acoustic engines uses inert gases which is safe and no adverse effect on the atmosphere like the depletion of ozone layer and global warming.

Even though acoustic Refrigeration is efficient and cost effective its commercial application is warranted the need of more R&D efforts for technology up gradation and standardization without which its eff ....etc

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ABSTRACT
In the last two decades, underwater acoustic communications has
experienced significant progress. The traditional approach for ocean-
bottom or ocean-column monitoring is to deploy oceanographic sensors,
record the data, and recover the instruments. But this approach failed
in real-time monitoring. The ideal solution for real-time monitoring of
selected ocean areas for long periods of time is to connect various
instruments through wireless links within a network structure. Basic
underwater acous ....etc

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CHAPTER 1
INTRODUCTION
1.1 AUTONOMOUS UNDER WATER VEHICLE
Autonomous underwater vehicles (AUVs) provide marine researchers with new forms of access to the ocean. AUVs are platforms for a variety of sensors: acoustic, magnetic, gravimetric and chemical. One acoustic-based sensor, a multibeam swath mapper, can map seafloor bathymetry with the resolution of a few centimeters. This resolution is sufficient for detecting and measuring seafloor deformation associated with geophysical phenomena, e.g., mid ocean ridge evolution.
This AUV is all ....etc

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BackGround
A CDMA (Code Division Multiple Access) based communication system allows the users to share an available frequency spectrum. The users are allocated different codes that are recognizable for the preferred receivers. This solution has several advantages, among other it gives increased robustness to interference. The CDMA project will investigate the benefits and losses of using CDMA communication system on an acoustic channel between two computers. The focus of the project will be to study how a higher data rate will affect t ....etc

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Acoustic Refrigeration
Foundation
Thermoacoustic Refrigeration
Alternative
Replaces Compressor with a loud speaker
Substitutes conventional refrigerants for inert gases (i.e. helium)
Operation
Increase Pressure raise Temperature
Diffusion of heat to or from stacks: Thermal Penetration
Standing Wave: Pressure in phase with Displacement
Application
Existing
NASA
Preserve blood and urine samples
U.S. Navy
Cool radar electronics onboard warships
Potential
Marine Vehicles
Replace Noisy Genera ....etc

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i need magnetic refrigeration full report for giving seminar on this topic
i am the finel year student of mechanical branch..plz send it quickly with latest technology ....etc

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Hi,can anyone please explain about the advantages and limitations of Thermo acoustic refrigerator when compared to VCRS other than eco friendly ....etc

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