Multi-objective Optimization Of Thermoacoustic Refrigerator

Thermoacoustic device is a new type of energy conversion device that has been highly praised and researched by scholars and experts in recent years.It has many outstanding advantages,such as high reliability,no environmental pollution,low energy grade requirements,no(or few)moving parts and so on.It has a promising prospect in power engineering,new energy utilization,refrigeration and cryogenic engineering,as well as modern vehicles(such as aerospace,ships,submarines,etc.)and many other fields.Among thermoacoustic applications,the thermoacoustic refrigerator has a particularly broad prospect,and its continuous development in miniaturization is becoming a new direction for the cooling of electronic equipment in the future.Based on the previous studies,this paper uses two different thermoacoustic refrigeration microcirculation models,and uses the finite time thermodynamics method to optimize the thermoacoustic refrigeration microcirculation in the thermoacoustic stack of thermoacoustic refrigerator.The influence of these paratmeter on the performance of the cycle is analyzed in the paper.The influence of irreversible factors and heat leak on the performance of thermoacoustic refrigeration system is considered.What's more,the multi-objective optimization method is also used to optimize the thermoacoustic refrigeration microcirculation,and the results are compared with single target optimization.The main research content of the article includes the following parts:1.The micro-thermodynamic cycle processes and performance of thermoacoustic refrigerator are analyged.The content is divided into two parts:The traditional irreversible thermoacoustic refrigeration microcirculation model is studied in the first part.,The finite time thermodynamics is used to optimize a series of objective functions such as coefficient of performance,refrigeration rate,? function,and profit margin.The relationship between each parameter and the objective function is obtained.In the second part,an irreversible thermoacoustic refrigeration microcirculation model with linear process is established.The refrigeration cycle is also briefly described and the endothermic heat release of gas micelles in the linear process is analyzed.The optimization relationship and characteristic curves betweendifferent objective functions and various influencing parameters for the irreversible thermoacoustic cooling microcirculation model with linear process are obtained.2.The current researches on multi-objective methods for traditional multi-objective optimization and algorithm optimization are introduced.In this paper,two different multi-objective optimization methods are used to optimize the performance objectives and economic goals of the thermoacoustic refrigerator with the Brayton cycle.The conclusions are compared with the single-objective optimization to obtain the optimal solution.3.A series of experiments were carried out using the existing dual-source thermoacoustic refrigeration experimental device.The relationship between the temperature gradient superimposed on the thermoacoustic stack and other experimental parameters was studied.The effects of inflation pressure,frequency and regenerator packing on the temperature difference were tested,and the optimal regenerator packing,frequency,aeration temperature,and the maximum cooling temperature difference and phase difference were obtained.