1 Review of Investigations in Eco- Friendly Thermoacoustic (original) (raw)

Review of investigations in eco - friendly thermoacoustic refrigeration system

Thermal Science, 2015

To reduce greenhouse gas emissions, internationally research and development is intended to improve the performance of conventional refrigeration system also growth of new-fangled refrigeration technology of potentially much lesser ecological impact. This paper gives brief review of research and development in thermoacoustic refrigeration also the existing situation of thermoacoustic refrigeration system. Thermoacoustic refrigerator is a novel sort of energy conversion equipment which converts acoustic power into heat energy by thermoacoustic effect. Thermoacoustic refrigeration is an emergent refrigeration technology in which there are no moving elements or any environmentally injurious refrigerants during its working. The concept of thermoacoustic refrigeration system is explained, the growth of thermoacoustic refrigeration, various investigations into thermoacoustic refrigeration system, various optimization techniques to improve coefficient of performance, different stacks and r...

A Review on Thermoacoustic Refrigeration System

Thermoacoustic refrigeration is an emerging 'green' technology based upon the purposeful use of high-pressure sound waves to provide cooling. The design and functionality of thermo-acoustic refrigerator have been the focus of considerable attention from the research community since 1980. This environmental friendly technology has the potential to replace conventional refrigerator once the improvements in design and technology are realized.

Experimental Investigations on the Performance of Eco-Friendly Thermoacoustic Refrigerator

Development of refrigerators based on Thermoacoustic technology is a novel solution to the present day need of cooling without causing environmental hazards. With added advantages of absence of moving parts and circulating refrigerants, these devices can attain very low temperatures maintaining a compact size. This paper presents an experimental work based on the results obtained from the sound wave thermoacoustic refrigerator. In this study, the performance of the thermoacoustic refrigerator is based on the temperature difference measured at the end of extremities of the stack. The optimized variables are the stack length, stack center position and the plate spacing represented by the blockage ratio.

Thermoacoustic Refrigeration System – A Review

2020

Conventional refrigeration system is being used widely for cooling purposes using various chemical refrigerants currently. However, this present scenario poses a major threat to the environment as the emission of harmful gases like ChloroFluoro Carbon (CFC), Hydro ChloroFluoro Carbon (HCFC) are on the rise due to the excess use of chemicals, and the requirement for refrigeration system is increasing. Hence, there is a necessity to find an alternative to conventional refrigeration. Thermoacoustic refrigeration system is one of the harmless types of refrigeration system, which offers a wide range of scope for further research. Some key advantages include no emission of harmful ozone depleting gases as chemical refrigerants are not required and the presence of no moving parts. The major disadvantage of the method is lesser Coefficient of Performance. This field is gathering the attention of many researchers as it combines both the disciplines of thermal and acoustics. Researchers have ...

THERMOACOUSTIC REFRIGERATION SYSTEM

Cooling is generally obtained by vapour compression system using a specific refrigerant. But it has been recently found that the refrigerants are known to cause adverse environmental effects. In order to save our environment, it is a must that we develop new alternative refrigeration technologies like thermo acoustic refrigeration system, avoiding environmentally hazardous refrigerants. In this study, a thermo acoustic refrigerator (TAR) uses sound waves to provide cooling. Here the device is designed, consisting of a acoustic wave generation device regulated to the channel of a hollow tube, with a stack at a predetermined position in the channel of the tube. From the acoustic wave generation device, an acoustic wave emitted, achieving a temperature gradient across the stack.

Review on Thermoacoustic Refrigeration

The impact of hazardous refrigerants used in the conventional vapor compression refrigeration system and environmental issues related to VCRS system, alternative refrigeration technologies receive the attention of researcher's. The thermo acoustic refrigeration not utilizes any harmful refrigerants it uses only inert gasses as their working fluid, which does not cause any adverse effect on the environment. This review focuses on the various component of TAR and optimization methods use to improve the system performance. Most of the studies related to stack geometry, stack center position, resonance cavity and its length. The other work related with a heat exchanger, different algorithm's for system parameters optimization to get desired output along with COP of the thermoacoustic refrigeration system. Regarding current scenario, thermoacoustic refrigeration could be an emerging technology in a refrigeration system

Study and prototype of the thermoacoustic refrigerator

2018

A thermo acoustic refrigerator (TAR) includes an acoustic wave generation device arranged directed to the channel of a hollow tube, and a stack provided at a pre-determined position in the channel of the tube. A temperature difference is obtained across the stack by an acoustic wave emitted from the acoustic wave generation device. The working fluid used is air. This work examined the performance of thermo acoustic refrigeration, which is the theory of using sound waves to cool the air. The main aim of this work is to design and construct a small thermo acoustic refrigerator from inexpensive and readily available parts and analyzed the results. The design includes dimension of stack, selection of acoustic driver, and acoustic resonator. The experiments showed that while thermo acoustic cooling was possible, high efficiency was beyond our reach due to materials restrictions. We obtained the temperature difference of 7°C for constructing this simple device. However, from these limitat...

THERMOACOUSTIC REFRIGERATION SYSTEM SETUP

This project examines the effectiveness of thermo acoustic refrigeration, which is the theory of using sound waves as a coolant. The work reported here deals with the design and optimization of a thermo acoustic-refrigerator (TAR) as an attempt to address the future generation environment friendly energy systems. The literature survey gives a complete picture on the history of thermo acoustics and the work carried out in the field of thermo acoustics till today. The motivation of the design of thermo acoustic refrigerator explains the reasons for carrying out the work illustrating its benefits and how the performance of the TAR in future can be made efficient in comparison with the performance of a conventional refrigerator

Eco-friendly & Free Cooling Obtained by Thermo acoustic Refrigeration System

Thermoacoustic refrigeration systems provide a practical solution to the problem of heat management where heat can be pumped or spot cooling can be induced. This is new among emerging technology with a strong potential towards the development of sustainable and renewable energy systems by utilizing solar energy or wasted heat. The most inhibiting characteristic of current thermoacoustic cooling devices is the lack of efficiency. Although simple to fabricate, the designing of thermoacoustic coolers involves significant technical challenges. The stack has been identified as the heart of the device where the heat transfer takes place. Improving its performance will make thermoacoustic technology more attractive. The present study highlights the importance of thermal losses in the modeling of small-scale thermoacoustic engines using a multi-objective approach. The proposed modeling approach for thermoacoustic engines provides a fast estimate of the geometry and position of the stack for maximum performance of the device.