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Thermoacoustic refrigeration Seminar report

From creating comfortable home environment to manufacturing fast and efficient electronic devices, air conditioning and refrigeration remain essential services for both homes and industries. It is becoming increasingly important in the design and development of refrigerating systems to consider environmental impacts. To eliminate the use of environmentally hazardous refrigerants, research efforts are focussing more on the development of alternative refrigerants and alternative refrigeration technologies. An approach in the category of alternative technologies is thermoacoustic refrigeration which produces cooling from sound.
The thermoacoustic effect was first discovered in the 19 th century when heat driven acoustic oscillations were observed in open-ended glass tubes. These devices were the first thermoacoustic engines, consisting of a bulb attached to a long narrow tube. It was in the 1980’s that thermoacoustic refrigerator was first developed, when a research group at the Los Alamos National Laboratory showed that the effect could be used to pump heat. The technology has seen rapid growth since then, developing it to a promising asset as a clean and environmentally friendly refrigeration method.

Emmanuel c. Nsofor and Azrai Ali (2009) studied on the performance of the thermoacoustic refrigerating system with respect to some critical operating parameters. Experiments were performed on the system under various operating conditions. The experimental setup consists of the thermoacoustic refrigerating system with appropriate valves for the desired controls, instrumentation and the electronic data acquisition system. The resonator was constructed from aluminium tubing but it had plastic tube lining on the inside to reduce heat loss by conduction. Significant factors that influence the performance of the system were identified. The cooling produced increases with the temperature difference between the two ends of the stack. High pressure in the system does not necessarily result in a higher cooling load. There exists an optimum pressure and an optimum frequency for which the system should be operated in order to obtain maximum cooling load. Consequently, for the thermoacoustic refrigeration system, there should be a related compromise between cooling load, pressure and frequency for best performance.

Ramesh Nayak.B. et al. (2011) proposed the design of a Thermo Acoustic Refrigerator (TAR) stack. The design strategy has been described along with the values of the important working gas parameters as well as the non-dimensional parameters. The design and optimisation of thermo acoustic refrigerator for a cooling power of 10 watt was designed. An attempt has been made to design the TAR by using CATIA. Further modelling and optimization of the design is carried out using MATLAB. Jonathan Newman et al. (2006) explored the basic principles of thermoacoustic refrigeration, to produce a small thermoacoustic refrigerator out of readily available parts. The model constructed for this research project employed inexpensive, household materials. Although the model did not achieve the original goal of refrigeration, the experiment suggests that thermoacoustic refrigerators could one day be viable replacements for conventional refrigerators.

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