新的气体平均比热容温度线性关系式

A New Linear Temperature Correlation For Data of Average Specific Heat of Ideal Gases

通过直接以温度的线性关系式拟合气体平均比热容表中数据,得出了计算气体在0—t(℃)间的平均比热容的新的温度直线关系式。拟合分段进行,以减小关系式的计算偏差。文中对几种常见气体的平均比热容在0℃-1200℃内进行了拟合,给出了系数值和拟合偏差。和现有的相似关系式做了计算对比,表明用本文方法确定的关系式计算更准确。在0℃-1200℃内,拟合式的平均计算偏差小于0.3%。

A linear temperature correlation is designed to directly fit data in the average specific heat table of ideal gases and therefore a new linear correlation with relation to temperature is obtained to evaluate values of average specific heat of ideal gases in the range from 0 ℃ to 1200℃.To improve the precision of the correlation,fitting is carried out in three subintervals into which the whole temperature range is divided.The coefficients of the correlation are given for seven common gases in the paper.Compared with the similar one available,the correlation given in this paper is more accurate.The average calculation deviations of this correlation are less than 0.3% for seven gases in the range of temperature from 0 ℃ to 1200℃.