耦合储液气液分离器的新型空气源热泵系统除霜性能及系统调控机理研究

针对空气源热泵在北方寒冷地区及南方高湿地区工作时易发生结霜并引起性能下降的问题，申请人提出一种可实现除霜性能提升的耦合储液气液分离器的新型空气源热泵系统。该新型系统与逆循环除霜方式相比具有制冷剂循环量大、除霜时间短等优点。本项目拟通过理论分析、实验研究与数值模拟相结合的方式对该新型空气源热泵系统的除霜性能及系统调控方法展开研究。通过建立储液气液分离器动态热质交换模型，分析储液气液分离器内部制冷剂的物态分布规律，探究储液气液分离器结构优化方法；阐明系统内部质量流作用机理，揭示系统制热/ 除霜模式切换时管路内循环制冷剂迁移特性；构建新型空气源热泵系统动态响应模型，探究其在不同环境条件和调控参数下的性能变化规律；研究系统各子部件间的能耗分配和协同耦合运行特性，揭示新型空气源热泵系统除霜性能调控机理。本项目的研究将丰富和拓展空气源热泵除霜性能研究和系统调控理论，提高空气源热泵技术环境适用性。

To cope with the problem that air source heat pump is prone to frosting and performance degradation when working in cold areas in north China and high humidity areas in south China, the applicant proposes a new type of air source heat pump system with liquid storage coupled gas-liquid separator that could improve defrost performance. Compared with the reverse cycle defrosting method, the new system has the advantages of larger refrigerant circulation, shorter defrosting time and lower energy consumption. This project intends to study the defrosting performance and system regulation method of the new air source heat pump system by combining theoretical analysis, experimental research and numerical simulation. Through the establishment of dynamic heat and mass exchange model of liquid storage coupled gas-liquid separator, the distribution law and the optimization method of structure of liquid storage coupled gas-liquid separator are explored. The mechanism of mass flow in the system is explained and the migration characteristics of circulating refrigerant in the pipeline are revealed when the heating/defrosting mode of the system is switched. The dynamic response model of the new-type air source heat pump system is built to explore its performance variation under different environmental conditions and regulatory parameters. The energy consumption distribution and synergistic coupling operation characteristics among the sub-components of the system are studied to reveal the defrosting performance regulation mechanism of the system. The research of this project will enrich and expand the defrosting performance research and system control theory of air source heat pump, and improve the environmental applicability of air source heat pump technology.