Simulation model for complex refrigeration systems based on two-phase fluid network – Part I: Model development
Simulation model for complex refrigeration systems based on two-phase fluid network – Part I: Model development
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DOI：
10.1016/j.ijrefrig.2007.07.001
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
S. Shao;W. Shi;Xianting Li;Q. Yan
中科院分区：
文献类型：
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作者：
S. Shao;W. Shi;Xianting Li;Q. Yan
一些具有多个冷凝器和蒸发器的复杂制冷和热泵系统已针对不同类型的应用而开发。传统的仿真模型是针对某些运行模式下的系统开发的，无法对换热器功能和制冷剂流动方向不确定的复杂制冷系统进行建模。为了预测复杂制冷系统的性能，提出了基于两相流体网络的仿真模型。该模型由热交换器和连接管的分布式参数模型、变频压缩机和电子膨胀阀（EEV）的基于映射的模型组成。根据制冷系统和流体网络的特点，迭代求解能量、动量和质量三个守恒方程。该模型通过将元件求解过程与流体网络模型分离来处理制冷剂流向的不确定性，因此可以模拟不同工况和工况下的各类复杂制冷系统。通过变频空调制热/制冷工况下的实验数据对模型进行了验证，结果表明模型的误差主要由部件子模型计算传热和压力损失时的误差决定。该模型在配套文章中应用于三种复杂制冷系统的性能分析[Shi W.X., Shao, S.Q., Li, X.T., Yan, Q.S., 2008. 基于两相流体网络的复杂热泵系统仿真模型：第二部分 - 模型应用, International Journal of Refrigeration 31 (3), 500–509.]。
Some complex refrigeration and heat pump systems with several condensers and evaporators have been developed for different kinds of application. Traditional simulation models were developed for systems in certain operating modes and they failed in modeling the complex refrigeration systems with uncertainties of heat exchangers function and refrigerant flowing direction. In order to predict the performance of complex refrigeration systems, a simulation model is presented based on the two-phase fluid network. The model is consisted of distributed-parameter model of heat exchangers and connecting tubes, map-based model of inverter compressor and electronic expansion valve (EEV). Based on the characteristic of refrigeration system and fluid network, the three conservation equations, i.e. energy, momentum and mass equations, are solved iteratively. This model can deal with the uncertainty of refrigerant flow direction by separating the solving process of the components and the fluid network model, and therefore can simulate different kinds of complex refrigeration systems in different operating modes and conditions. The model is validated by the experimental data of an inverter air conditioner in heating/cooling operating modes and it shows the error of the model is mainly determined by the error of submodels of components in calculating heat transfer and pressure loss. The model is applied for performance analysis of three kinds of complex refrigeration systems in the accompanying article [Shi W.X., Shao, S.Q., Li, X.T., Yan, Q.S., 2008. Simulation model for complex heat pump systems based on two-phase fluid network: part II – model applications, International Journal of Refrigeration 31 (3), 500–509.].