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变制冷剂流量(VRV)多联空调系统动态仿真
其他题名Dynamic Simulation on Varied Refrigerant Volume(VRV) Multiple-Zone Air Conditioning System
韩汉平
导师冯自平
2008-06-02
学位授予单位中国科学院广州能源研究所
学位授予地点广州能源研究所
学位名称硕士
关键词Vrv多联空调系统 仿真 动态模型 移动边界模型 微分代数方程
摘要变制冷剂流量(Varied Refrigerant Volume,VRV)多联空调系统是一台室外机可连接多台室内机,且制冷剂直接输送至各室内机进行换热的直接蒸发式空调系统。本文在理论分析的基础上,建立了VRV多联空调系统的动态仿真模型,进而依据此模型实现了对系统动态特性的仿真计算,为VRV多联空调系统的运行规律及系统性能的分析研究提供了有效依据。 各组件模型是建立系统仿真模型的基础。对于压缩机和膨胀阀,由于其在系统中的作用主要体现在其外特性上,故本文采用通用的效率法对压缩机进行建模,而膨胀阀则采用孔板方程模型;对于蒸发器和冷凝器等换热组件,综合考虑仿真精度和计算效率两方面因素,采用了分区集总参数法,对两相区和单相区分别进行建模,并引入平均空隙率理论,建立了各换热器的移动边界模型。 系统模型是各组件模型的有机结合体,结合的关键是各组件模型边界条件的有效确立。针对系统中的耦合边界条件(各蒸发器出口和集液器进口),本文依据组件之间的实际约束关系,建立了耦合边界条件的代数约束方程,结合换热器流动换热微分方程,建立VRV空调系统的微分代数方程(DAE)形式的系统模型。在模型求解过程中,首先将系统微分代数方程模型等价转化为对应的非线性控制系统,进而通过引入滑模控制和奇异摄动近似,将系统微分代数方程(DAE)模型转化为常微分方程(ODE)模型,通过求解最终等价常微分方程(ODE)模型实现系统模型的仿真计算。
其他摘要Varied Refrigerant Volume (VRV) multiple-zone air conditioning system that characterized by direct evaporative cooling, with the refrigerant directly sent to each indoor unit to exchange heat with the indoor ambient environment, can be consist of multiple indoor units with only one outdoor unit. Based on the theoretical analysis, this thesis presents a methodology for developing a dynamic model of the VRV air conditioning system, and then the model is used to simulate the dynamic behavior of the VRV system. The simulation results provide valid research basis for the performance analysis of the VRV system. The system simulation model is built based on the component models. As for the compressor and valve, because their roles in the system are mainly embodied in their external characteristic, in this thesis the compressor model is built in general efficiency method, while the valve model is based on the orifice equations. As for the heat-exchangers such as evaporator and condenser, compromised between the calculation precision and efficiency, the moving boundary models for the two-phase flow region and single-phase flow region in heat-exchangers are built respectively, using lumped parameter method in each region based on the mean-void fraction theory. The system model is created by combining each of the component models, and the key point of this process is to determine the boundary conditions of each component appropriately. In this thesis algebraic constraint equations are built to describe the coupled boundary condition (outlet of the evaporators and inlet of the accumulator) in the VRV system according to the actual constraints between different components. Combining the algebraic constraints with the differential equations that describe the flow and heat-transfer mechanism in the system, generally results in a system model characterized by a differential-algebraic equation (DAE) system. The realization of the DAE system can be formulated as an equivalent nonlinear control problem, and then by combining sliding control with the singular perturbation method the DAE system is changed into an equivalent ordinary differential equation (ODE) system. Further, the simulation and calculation of the system model is realized by solving the equivalent ODE system.
页数74
语种中文
文献类型学位论文
条目标识符http://ir.giec.ac.cn/handle/344007/5794
专题中国科学院广州能源研究所
推荐引用方式
GB/T 7714
韩汉平. 变制冷剂流量(VRV)多联空调系统动态仿真[D]. 广州能源研究所. 中国科学院广州能源研究所,2008.
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