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题名	变制冷剂流量(VRV)多联空调系统动态仿真; Dynamic Simulation on Varied Refrigerant Volume(VRV) Multiple-Zone Air Conditioning System
作者	韩汉平
学位类别	硕士
答辩日期	2008-06-02
授予单位	中国科学院广州能源研究所
授予地点	广州能源研究所
导师	冯自平
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
其他题名	Dynamic Simulation on Varied Refrigerant Volume(VRV) Multiple-Zone Air Conditioning System
中文摘要	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.
语种	中文
公开日期	2011-07-14 ; 2011-07-15
页码	74
内容类型	学位论文
源URL	[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, Dynamic Simulation on Varied Refrigerant Volume(VRV) Multiple-Zone Air Conditioning System[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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