水蒸汽物化性质数据表的统一问题探讨

Data consistence in steam tables by temperature and by pressure

化学工程手册给出的温度表和压力表,极大地方便了工程技术人员的使用。然而在同一条件下从温度表查出的数据与从压力表查出的数据有出入,有些误差甚至高达2%。为此,作者依据温度表的数据通过拉格朗日插值技术和二分法计算求出不同压力下的水的各项性能数据,形成修正后的压力表,从而解决了两个表数据不统一的问题。经检验、修正后的压力表得到的结果与温度表得到的数据的误差均在0.2%范围内。为了数据的完整性,同时给出温度表数据。

The steam tables listed in chemical engineering handbooks are very useful to chemical engineers. The tables are listed in temperature order or pressure order. It is found that the results are different from the two tables. The error of some data is as high as 2%. The solution to the problem is to re- calculate the data in pres- sure table based on data from temperature table. Four - point - Lagrange interpolation is the best choice for the calculation, and a corrected pressure table is presented. For users＇convenience temperature table is also listed in this paper.