CO2热力性质及传输特性显式公式  

Explicit Formula for Thermal Properties and Transmission Characteristics of CO2

作　　者：邓小妹 赵红霞[1] 袁天鹏 徐婷婷 王新立 DENG Xiaomei;ZHAO Hongxia;YUAN Tianpeng;XU Tingting;WANG Xinli(School of Energy and Power Engineering,Shandong University,Jinan 250061,Shandong,China;School of Control Science and Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]山东大学能源与动力工程学院,山东济南250061 [2]山东大学控制科学与工程学院,山东济南250061

出　　处：《制冷技术》2020年第6期36-41,53,共7页Chinese Journal of Refrigeration Technology

摘　　要：以Refprop9.0的数据作为数据源,本文采用了有理分式逼近中帕德逼近的函数形式并进行函数构造,对于压力14.18~30 MPa、温度304~700 K范围内的二氧化碳导热、动力黏度、焓、密度和声速的物性公式进行了拟合,同时利用1stopt软件的快速拟合功能对软件内部提供的一千多种函数形式,对压力7.38~14.18 MPa、温度220~303 K及305~504 K范围内以及过冷区内(过冷度0~87 K)的比定压热容、导热系数及动力黏度的物性数据进行拟合。与Refprop9.0的数据比较,在压力为14.18~30 MPa、温度为304~700 K范围内的所有物性显式公式的总平均最大相对误差小于0.88%,平均最大误差小于4.59%;在压力为7.38~14.18 MPa、温度为220~303 K及305~504 K范围内以及过冷区内(过冷度0~87 K)的公式系数均不超过10个,所有物性显式公式的总平均相对误差小于1.1%,最大相对误差小于6.7%。With the source data from REFPROP9.0,the physical property formula fitting of the thermal conductivity,dynamic viscosity,enthalpy,density and sound speed of CO2 were fitted by adopting the function form of Pade'Approximant in rational fraction approximation and constructing the form of function in the pressure range of 14.18-30 MPa and temperature range of 304-700 K,meanwhile,for the specific constant pressure heat capacity,thermal conductivity and dynamic viscosity of CO2 in the pressure range of 7.38-14.18 MPa,temperature range of 220-303 K,305-504 K and subcooled zone(subcooling of 0-87 K),the fast fitting function of 1stopt software is used to fit more than 1,000 function forms provided in the software.The results show that:compared with Refprop9.0 data,the total average maximum relative error of the explicit formula of all physical properties in the range of pressure 14.18-30 MPa and temperature 304-700 K is less than 0.88%,and the average maximum error is less than 4.59%;in the pressure range of 7.38-14.18 MPa,temperature range of 220-303 K,305-504 K and subcooled zone(subcooling of 0-87 K),there are no more than ten formula coefficients and the total average relative error of all the explicit formulas of physical properties is less than 1.1%,the maximum relative error is less than 6.7%.

关 键 词：CO2物性 显式计算模型 最小二乘法 

分 类 号：TB611[一般工业技术—制冷工程] TK124[动力工程及工程热物理—工程热物理]