常用焓湿图热湿比线的作图法
Drawing methods of angle scale line on a common psychrometric chart
摘要：
分析了湿空气状态参数间的关系，给出了含湿量、比焓的比长度定义，介绍了两点作图法、角度尺量法两种确定热湿比线的作图法。根据坐标系中坐标的表示方法及正弦定理和热湿比的定义，论证了常用焓湿图热湿比与热湿比线和等含湿量线之间夹角间的关系，并以此作为角度尺量法确定热湿比线的理论依据。举例说明了两点作图法、角度尺量法的应用，对比了两者的优劣，结果表明两点作图法确定热湿比线更方便快速。
Abstract：
Analyses the relationship between state parameters of wet air, gives the definitions of the length to unit humidity and unit specific enthalpy, and presents two angle scale line drawing methods of two points and using angle measurement. According to representing method of coordinates in oblique coordinate system and the law of sine and the definition of angle scale, demonstrates the relationship between an angle scale and the angle between the angle scale line and an isohume on a common psychrometric chart, and takes it as the theory basis of drawing an angle scale line with angle measurement method. Illustrates the application of the two drawing methods of two points and using angle measurement, and compares the advantages and disadvantages of the two methods. The result shows that with the two point method can conveniently and quickly draw an angle scale line on a psychrometric chart.
Keywords:psychrometricchart,stateparameter,anglescaleline,anglemeasurementdrawingmethod,twopointdrawingmethod