通过调用NIST中有关制冷剂物性的源代码，对毛细管进行模拟仿真，试验结果与试验结果相符较好。-Simulation, source code by calling NIST refrigerant properties on the capillary test results consistent with the experimental results.

REFPROP9物性计算软件，比较新的一个版本，十分好用-REFPROP9 physical computing software, a relatively new version, very easy to use

fluent中不用nist调用，而用这个文件加载co2的物性，计算更快更准-fluent in not nist call, and use this file to load properties co2 calculate faster and more accurate