Abstract
The performance of a thermoacoustic system that is composed of a looped tube, an engine stack, a cooler stack, and four heat exchangers, is numerically investigated. Each stack has narrow flow channels, is sandwiched by two heat exchangers, and is located in the looped tube. In order to provide a design guide, the performance of the system is numerically calculated by changing the following three parameters: the radius of the flow channels in the engine stack, the radius of the flow channels in the cooler stack, and the relative position of the cooler stack. It was found that when the three parameters are optimized, the efficiency of the engine stack reaches 75% of Carnot’s efficiency and the coefficient of the performance (COP) of the cooler stack is 53% of Carnot’s COP, whereas 33% of the acoustic power generated by the engine stack is utilized in the cooler stack.
Highlights
In 2001, Yazaki et al constructed and tested a thermoacoustic cooling system that has no moving parts and can be driven by various types of heat sources such as sunlight and waste heat [1]
Experimental results indicated that an increase in the temperature of the hot heat exchanger spontaneously produces an acoustic wave due to the thermoacoustic effect [2,3] and the wave travels in the looped tube
We have numerically investigated the performance of the thermoacoustic cooling system shown in Figure 1 by using the thermoacoustic theory initially proposed by Rott [9,10]
Summary
In 2001, Yazaki et al constructed and tested a thermoacoustic cooling system that has no moving parts and can be driven by various types of heat sources such as sunlight and waste heat [1]. Yazaki et al measured the acoustic pressure and velocity along the looped tube and experimentally demonstrated that both the excitation of the acoustic wave and the thermoacoustic heat pumping are performed through thermodynamic cycles in a manner similar to Stirling and reversed Stirling cycles [4], respectively. These cycles are known to be inherently reversible, and, it is expected that the cooler becomes an efficient system
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