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毛细管是制冷空调装置中常用的节流元件之一.毛细管的流动特性对装置的系统性能影响显著,因此,建立一个好的毛细管模型对于装置的设计和优化都是必要的.尤其是近年来,CFCs环保问题的影响,推动了毛细管研究从理论和实验两方面向着工质替代的方向发展.从文献中的毛细管模型来看,早期的模型受计算工具等条件的限制,大都比较简单,精度也不高;近年来,这些限制不再存在,研究者趋向于采用分布参数模型以提高预测精度.但是,分布参数模型在计算速度和计算的健壮性方面尚有欠缺,不适用于实用型的系统仿真和优化.因此,建立简单、准确、通用的毛细管模型,具有重要的理论和应用价值.
Capillary is one of the most commonly used throttling elements in refrigeration and air conditioning systems.Capillary flow characteristics have a significant impact on the system performance of the device, so establishing a good capillary model is necessary for the design and optimization of the device.Especially in recent years, CFCs environmental problems, and promote the capillary theory from both theoretical and experimental aspects toward the replacement of working fluid direction.From the capillary model in the literature, the early models are limited by the calculation tools and other conditions, mostly simple and accurate These limits are no longer exist in recent years, researchers tend to use the distributed parameter model to improve the prediction accuracy.However, the distributed parameter model in the calculation speed and computational robustness is still lacking, not suitable for practical systems Simulation and optimization.Therefore, to establish a simple, accurate and universal capillary model has important theoretical and practical value.