摘要
提出CO2亚临界压力区具有统一形式的热力性质和传输特性的显式计算模型．由于模型为显式形式，不存在迭代，保证了热物理性质计算的高速性和绝对稳定性；同时，所有热物理性质的计算模型形式统一，便于系统仿真的调用．以REFPROP7的计算结果作为数据源，对制冷剂环保替代中重要的自然工质CO2的热物理性质在压力为三相点压力至临界压力，过热度0～200K、过冷度0～87K的数据范围内进行拟合，并将该快速计算模型与REFPROP7相应公式的计算结果和计算速度进行对比．结果表明，所有快速计算模型的总平均偏差小于0．156％，最大偏差小于10.43％；速度比RFFPROP7的计算速度提高了2～4个数量级．
A uniform fast calculation model for CO2 thermodynamic and transport properties in sub-critical pressure region, covering pressure from the pressure of triple point to critical point, superheating of 0- 200 K, subcooling of 0-87 K, was presented. This method can guarantee the calculation stability and high calculation speed of thermophysical properties of CO2 and it is also convenient in cases of simulation of refrigeration system for its uniform expression and no need of iteration. The source data is calculated from REFPROP7. The comparison result shows that the calculation speed of the fast calculation model is two to four orders faster than those of REFPROPT. And the total mean relative deviation and maximum relative deviation for all fast calculation models are less than 0. 156% and 10.43%, respectively.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2008年第8期1259-1264,共6页
Journal of Shanghai Jiaotong University
关键词
二氧化碳
热力
传输特性
饱和
过热
过冷
carbon dioxide
thermodynamic
transmission characteristics
saturated
superheated
subcooled
