多联机室内机制冷剂管网流量分配仿真模型

Simulated Model for Refrigerant Flow Distributary of MAU Indoor Pipe Network

针对多联机室内机制冷剂管网中制冷剂流量分配不均,将流体网络理论应用于包含蒸发器、管段、电子膨胀阀、三通等单相、两相制冷剂的复杂管网系统,按照管网拓补结构连接各个部件模型,得到了5台室内机及连接管构成的管网的稳态仿真模型;针对流阻的非线性特点设计了以每两个相邻环路压降之差小于50Pa作为控制条件的迭代算法,根据流阻分配各个环路流量直至管网达到压强平衡。该模型可以研究、评价制冷剂流量分配不均程度,为解决多联机流量分配不均提供理论依据。

Refrigerant flow maldistribution in two-phase fluid network of multi-connected air-condition unit （MAU） is serious. A fluid network theory was extended to solve the complex two-phase fluid network of MAU indoor units and connecting pipes. With pipe/tube fluid resistance considered, a MAUfluid network model was built by a series of fluid circuits of different refrigerating components including single-phase pipes and two-phase electronic expansive valve （EEV）, evaporator, pipes in parallel or series. Then a particular iterating control algorism was designed to distribute refrigerant mass flow in proportion to corresponding fluid resistance until the pressure of network achieves equilibrium. This model is available to theoretically rate and investigate refrigerant flow maldistribution among MAU indoor units.