摘要
湿空气热湿参数的准确计算在矿井热害的防治中具有重要意义。为了研究大气压力对深井湿空气热湿参数计算差异的影响,降低利用普通焓湿图查取非标准气压下湿空气热湿参数的误差及计算与查取过程的烦琐等问题,在对湿空气热湿参数进行分析的基础上,提出利用Excel电子表格对不同气压下湿空气热湿参数进行计算,并以气压分别为0.8×105Pa、101 325 Pa与1.15×105Pa为例对湿空气参数进行了计算与比较分析。结果表明,用标准气压代替实际气压对湿空气参数进行计算时,湿空气焓值、含湿量及密度的计算误差较大,因此,不宜用标准气压下的热湿参数代替实际气压下的热湿参数。
The present paper intends to study the influence of the change of atmospheric pressure on the thermodynamic parameters of the humid air in deep mine so as to provide an accurate and prompt method for its calculation. As is known, the thermodynamic parameters of the humid air in the deep mine can always be gained by consulting the psychrometric chart of 1.013 25×10^5 Pa pressure, but, in fact, the atmospheric pressure in the mine is not always equal to the said indicator of 1.013 25×10^5 Pa and even shows a great difference. In order to explore the relationship between the thermodynamic parameters and the atmospheric pressure, it is necessary, first of all, to find the relationship between the thermodynamic parameters and the atmospheric pressure based on the analysis of the above said thermodynamic parameters. However, it is very difficult to solve this function because it involves a transcendental equation. And, so, next, the author of the paper likes to put forward a new way of calculating the parameters of the humid air easily and conveniently with the iterative computation function of Microsoft Excel 2010, and provides the calculation method and process. And, finally, as an example, the thermodynamic parameters of the humid air under the atmospheric pressure of 8.0×10^4 Pa, 1.013 25×10^5 Pa and 1.15×10^5 Pa can be worked out and put into analysis process. And, via calculation and contrast, it would be possible to cause troubles like a big deviation for the enthalpy, specific humidity and density of the humid air if it is to use the psychrometric chart of 101 325 Pa pressure instead of the actual pressure. And, in such situations, the enthalpy, the specific humidity are likely to decrease with the increase of the air pressure, though the air density may go just to the opposite. And, in turn, the water vapor pressure, the relative humidity and the dew-point temperature would like to make some change as compared with other parameters with the humid air. In conclusion, this paper points out that it is improp
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第3期36-39,共4页
Journal of Safety and Environment
基金
矿山热动力灾害与防治教育部重点实验室基金项目(JSK201209)
关键词
安全工程
湿空气
深井
气压
热学参数
safety engineering
humid air
deep mine
atmospheric pressure
thermodynamic parameters
