超临界压力区CO2热力性质及传输特性的快速计算模型  

Fast Calculation Model of Thermodynamic and Transport Properties of CO_2 in Over-critical Pressure Region

作　　者：龙琼[1] 曾伟平[1] 谷波[1] 胡欢[1] 张春路 

机构地区：[1]上海交通大学制冷与低温研究所,上海200240 [2]开利空调冷冻研发管理有限公司,上海201206

出　　处：《制冷学报》2008年第6期30-35,共6页Journal of Refrigeration

摘　　要：提出二氧化碳在超临界压力区热物理性质统一的显式计算模型。该模型为显式形式,不存在迭代,既可以保证计算模型的高速性和稳定性,又可以达到较满意的精度;同时所有热物性的计算模型形式统一性也便于系统编程和仿真调用。使用REFPROP7的数据作为数据源,对制冷剂环保替代中重要的自然工质二氧化碳的热物性在超临界压力区(压力7.40～22.2MPa,温度Tpc-100～Tpc)的数据范围内进行拟合,并将该快速计算模型与REFPROP7数据源进行对比。对比结果表明,所有快速计算模型的总平均偏差小于0.5898%,最大偏差小于13.30%;速度比REFPROP7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 over-critical pressure region was proposed. The calculation stability and fast calculation speed for the properties of CO2 can be ensured due to its explicit expression and no need of iteration. With the source data from REFPROP7, the thermodynamic properties of CO2 were simulated in the range from the critical point to 22.2MPa, and from Tpc-100K to Tpc and from Tpc to Tpc＋200K. The comparison result shows that the calculation speed of this fast calculation model is two to four orders faster than that of REFPROP7. Moreover, the total mean relative deviation and maximum relative deviation of all the fast calculation models is less than 0.5898% and 13.30 %, respectively.

关 键 词：工程热物理 快速计算模型 最小二乘法 二氧化碳 超临界 

分 类 号：TK121[动力工程及工程热物理—工程热物理]