一个新的适用于近临界区域CO2导热系数计算的关联式

中文关键词: 二氧化碳  导热系数  关联式

中文摘要:

      提出了一个新的CO2导热系数关联式，该关联式适用273~1 273 K，0.07~210.00 MPa，1.0~1 145.0 kg/m3。与以往CO2导热系数关联式相比，提出的关联式只需温度T和密度ρ两个已知参数，不仅在全域范围内提高了计算精度，而且解决了以往关联式在近临界区域计算精度变差的问题，便于工程应用。在整个温度压力的适用范围内，新关联式计算值与实验值的相对偏差绝对平均值为2.79%；在近临界区域内，相对偏差绝对平均值为4.94%。

英文摘要:

      A new correlation for calculating the thermal conductivity of carbon dioxide is presented. The applied thermodynamic region of this correlation is 273.00~1273.00 K,0.07~210.00 MPa and 1.0~1 145.0kg/m3. Compared with the previous thermalconductivity correlations of carbon dioxide,the proposed correlation is convenient for engineering application that only two known parameters are required, temperature T and density ρ, which improves the computation alaccuracy in the whole region,especially for the near-criticalregion. The absolute average value of relative deviations between the calculated values and the literature data are 2.79% and 4.94% for the whole applied range and the near-criticalregion,respectively.