Study On A 5000Hz Thermoacoustic Refrigerator And Prototype Design

The thermoacoustic refrigerator is a device that has simple structure with no moving parts. It not only has long service life but also can reduce the size by increasing the working frequency. Therefore, the thermoacoustic refrigerator has wide application prospect in the cooling of electronic components as a new type of refrigerator. Interiorly, studies on high frequency thermoacoustic refrigerator is still lack. The working frequency was improved to 5000Hz.The theory of high-frequency thermoacoustic refrigerator, tune mode of resonate, flow and temperature field was studied on. The prototype was designed and tested.1. According to the linear thermoacoustic theory, the working principle of the thermoacoustic refrigerator was studied from acoustics, thermodynamics and dynamics. Furthermore, the difficulty of studying the high-frequency thermoacoustic refrigerator was analyzed and summarized.2. The key structural parameters of the half of wave length thermoacoustic refrigerator which is driven by piezoelectric speaker were analyzed. The two parameters which are the length and the center position of the stacks were optimized by using dimensionless design approach to improve cooling performance of the thermoacoustic refrigerator theoretically.3. Tune mode was analyzed. The fundamental frequency is 5012.57Hz and the cut-off frequency is 7308.55Hz.4. The distribution of flow and temperature field in the thermoacoustic refrigerator was studied. The results show that in resonator the phase of pressure and velocity always maintains 90°. The loss of acoustic power is mainly concentrated in stacks, in the back of the heat exchanger, in a stacked plate gap, due to the viscosity of the gas, resulting in near solid velocity close to zero, the gas along a solid formation temperature gradient, the temperature drop of about 15K.In the gap of the stack, the velocity close to solid approximates zero because of the viscosity of the gas. The gas formed a temperature gradient along the solid. The temperature drop is 15K.5. The experimental prototype was assembled. Then an experiment of the prototype’s cooling performance was completed. The results show that the maximum temperature difference between hot and cold heat exchanger is 3K, the maximum temperature drop is 1.5K when the prototype’s working frequency is 5012.57Hz, mean pressure is 0.1 MPa, mean temperature is 15℃.