基于Modelica的空调制冷系统稳态性能仿真研究

发布时间：2018-11-09 13:34

【摘要】：压缩机、冷凝器、蒸发器、毛细管是组成房间空调器制冷系统的几个最主要的部件，对每个部件建立适当的系统仿真用模型并进行空调制冷系统的仿真，有利于对空调制冷系统主要性能和相关变量的关系进行分析，指导空调参数设计和部件匹配，从而为空调主要性能如能效比和制冷量等的优化设计奠定基础。为此，本文对以下三个方面进行了研究：（1）建立适合系统仿真要求的空调部件模型。其中对压缩机应用集中参数模型，对冷凝器和蒸发器应用分布参数模型，对毛细管应用分相集中参数模型，另外制冷剂热力性质和热物理性质计算模型综合了图表法和简化热力学公式法。这些建模方法的应用在满足系统仿真对模型精度的要求的同时，又大大降低了模型的复杂度，提高了模型的稳定性，缩短了仿真计算的时间。（2）基于多领域建模语言Modelica建立了包括压缩机，蒸发器，冷凝器，毛细管等基本部件在内的空调制冷系统模型库；然后根据制冷系统实际拓扑结构连接各主要组件建立了空调制冷系统模型，所建空调制冷系统模型库开放性好，，便于知识的积累，为后续空调制冷系统的稳态性能仿真奠定了基础。（3）深入研究了MWorks仿真平台对空调Modelica方程系统的分析求解原理及具体的求解策略。以此为基础对空调制冷系统稳态性能进行了仿真分析，包括制冷系统换热器的稳态特性仿真分析、频率特性仿真分析、工况参数仿真分析，从而有利于实现对空调制冷系统的单目标和多目标优化。
[Abstract]:Compressor, condenser, evaporator and capillary are the most important components of the room air conditioner refrigeration system. It is helpful to analyze the relationship between the main performance and the relative variables of the air-conditioning refrigeration system and to guide the design of the air conditioning parameters and the matching of the components, thus laying a foundation for the optimization design of the main performance of the air conditioning system such as the energy efficiency ratio and the refrigerating capacity. Therefore, the following three aspects are studied in this paper: (1) A model of air conditioning components suitable for system simulation is established. Among them, the centralized parameter model is used for compressor, the distributed parameter model for condenser and evaporator, the separated phase concentration parameter model for capillary tube, and the distribution parameter model for condenser and evaporator. In addition, the calculation model of thermodynamic and thermophysical properties of refrigerant is a combination of charting method and simplified thermodynamic formula method. The application of these modeling methods not only meets the requirements of system simulation for model accuracy, but also greatly reduces the complexity of the model, improves the stability of the model, and shortens the time of simulation calculation. (2) based on the multi-domain modeling language Modelica, the model base of air-conditioning refrigeration system including compressor, evaporator, condenser, capillary and so on is established. Then, according to the actual topology of the refrigeration system, the main components are connected to establish the model of the air-conditioning refrigeration system. The model base of the air-conditioning refrigeration system is open and convenient for the accumulation of knowledge. It lays a foundation for simulation of steady-state performance of air conditioning and refrigeration system. (3) the analysis and solution principle of Modelica equation system of air conditioning system based on MWorks simulation platform and the concrete solution strategy are studied in detail. On this basis, the steady-state performance of air-conditioning refrigeration system is simulated and analyzed, including the steady state characteristic of the refrigeration system heat exchanger, the frequency characteristic simulation analysis, the operating condition parameter simulation analysis. Thus, it is advantageous to realize the single objective and multi-objective optimization of air conditioning and refrigeration system.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657.2

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