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在温湿分析过程中,需要确定各种温度下饱和蒸汽压力之P_s(T)。目前,P_s的计算方法和图表很多,而且用不同的计算方法和图表得到的数值存在着较大的差异。我们对1981年版美国ASHRAE手册、我国1983年新版《空气调节设计手册》和1976年版苏联供热与通风手册三种手册中所列的P_s值进行分析,仅0℃以下的水蒸汽饱和压力P_s的数值就存在很大差异,其中-40℃时美国手册与中国手册相比P_s值的偏差达47％(见表1)。产生P_s值的偏差的第一个原因是各种手册引用的原始资料不同。由于历史上的原因,过去各种版本手册中的蒸汽图表是依据各自的蒸汽参数数据编制的,这样就造成了
In the temperature and humidity analysis process, the P_s(T) of the saturated vapor pressure at various temperatures needs to be determined. At present, there are many calculation methods and charts for P_s, and there are large differences in the values obtained with different calculation methods and charts. We analyzed the P_s values listed in the 1981 edition of the American ASHRAE Handbook, our 1983 new edition of the “Air Conditioning Design Handbook” and the 1976 Soviet Heating and Ventilation Handbook, and only the water vapor saturation pressure P_s below 0°C. There is a large difference in the values, of which the deviation of the P_s value from the American manual to the Chinese manual at -40°C is 47% (see Table 1). The first reason for the deviation of the P_s value is that the original data cited in the various manuals is different. For historical reasons, the steam charts in various versions of the manual have been compiled based on their own steam parameter data. This has resulted in