热力驱动双循环斯特林制冷机参数设计

The Parameters Designing for Heat Powered Dual Stirling Refrigerator

采用斯特林正循环和逆循环的自由活塞斯特林热机和制冷机组成自由活塞双斯特林制冷系统,能够实现一次能源的直接利用,对于能源的高效利用具有重要意义。该制冷系统各运动部件间无直接机械连接,仅通过流体传动实现热机和制冷机的自由活塞运动组件耦合,其热力学与动力学协同关系较为复杂。本文采用Sage软件建立自由活塞双循环斯特林制冷机模型,预设各运动组件相关参数,通过运行观察各组件参数影响关系,逐步确定初始输入参数,最终实现模型中运动组件的自由运行。以制冷量和COP最大为目标开展优化计算,确定系统的运行和结构参数,完成结构设计分析及制造。实验测试中在400 W热功率下制冷温度达到−26℃,验证了模型模块选择、参数设置和结构设计的正确性,达到样机设计目标。

The free-piston double Stirling refrigeration system using Stirling positive cycle and reverse circulation can realize the direct utilization of primary energy,and is of great significance for the efficient use of energy.There is no direct mechanical connection between the moving parts of the refrigeration system,and only the free piston moving components of the heat engine and the refrigerator are coupled through fluid transmission,and the synergistic relationship between thermodynamics and dynamics is complex.In this paper,the Sage software is used to establish a free-piston double Stirling chiller model,which presets the relevant parameters of each moving component,observes the influence relationship of each component's parameters and gradually determines the initial input parameters and finally realizes the free operation of the moving components in the model.Optimize calculations with the maximum cooling capacity and COP,determine the operating and structural parameters of the system and complete structural design analysis and manufacturing.In the experimental test,the cooling temperature reached−26°C under 400 W thermal power input,which verified the correctness of model module selection,parameter setting and structural design and achieved the prototype design goal.