理想气体热容预测的新公式
A New Formula for Predicting Heat Capacity of Ideal Gases
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- DOI:
- 作者:
- 苑伟民1,2
YUAN Wei-min1,2
- 作者单位:
- 中国石油化工股份有限公司天然气分公司广西液化天然气工程项目部 广西北海 536000
Guangxi LNG Project Management Department of SINOPEC Gas Company
- 关键词:
- 理想气体;热力学性质;热容;预测;多项式
ideal gas;thermodynamic properties;heat capacity;prediction;polynomial
- 摘要:
- 在温度、压力、相位和化学性质的变化中伴随着热效应，需要预测物质的焓、热容、比热容和熵的热效应的大小。这些属性(尤其是热容)也经常被用来关联其他物理性质和设计参数，如导热系数和普朗特数。对国内外12个具有代表性的理想气体热容的计算多项式进行对比分析发现：理想气体热容计算多项式各异，部分公式适用的气体种类少，部分公式没有给出适用的温度范围，不同文献中的公式其适用温度范围有所差异，且计算结果有明显的不同。为此，经过对国内外多个文献进行调研，将数据重新拟合、分析，给出了常用的烃类和非烃类理想气体热容计算的新公式。新公式具有以下特点：给出了常见的24种物质热容预测公式及其适用的温度范围与《API技术数据手册》相比，计算结果误差均小于1%适用温度范围广简单易用。
Heat effects accompany changes in temperature,pressure,phase and chemical properties.The effect magnitudes of enthalpy,heat capacity,heat capacity ratio and entropy of the substances involved are required to predict.These properties(particularly heat capacity) are also associated with other physical properties and design parameters such as the thermal conductivity and Prandtl Number.After studying and compar ing twelve typical polynomial equations of the heat capacity of ideal gases applied in different countries,it is found that these polynomial equations differ from one another and are suitable for less kinds of gases,some of them do not give applicable temperature range,the others give different applicable temperature ranges and obtain obviously different results.Therefore,through further investigating many relevant documents and conducting the data fitting and analysis,the new equation for calculating the heat capacity of 24 kinds of ideal gases of hydrocarbons and non-hydrocarbons is obtained which gives applicable temperature range,and the calculation errors are within 1% compared with those obtained from API Technical Data Book,the equation is applicable for wide temperature range and easy to use.2013,5(5): 7-11 收稿日期：2013-1-25DOI：10.3969/j.issn.1001-2206.2013.05.003基金项目：中国石油化工股份有限公司LNG资助项目(702081B0712)作者简介：苑伟民(1981-)，男，河南南阳人，工程师，2009年毕业于西南石油大学油气储运工程专业，硕士，现从事油气储运系统仿真与优化研究工作。