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关于湿空气的热力学性质,目前国内多使用由同济大学通风与空气调节教研究室于1979年所绘制的湿空气焓湿图(i—d图)来查算。它具有简单实用、同时采用国际单位制(SI)和通用米制两种单位制的优点,但也存在如下一些问题:(1)压力仅为500、550、600、650、700、730、745、760mmHg八种情况;(2)温度仅在-30°—65℃之间;(3)图上可查取参数仅限于压力、温度、相对湿度、含湿量、水蒸汽分压力、比焓以及露点(或霜点)温度,其他参数中湿空气的比容、比湿、比熵、热力学湿球温度等不能求出;(4)查曲线确定参数不太方便,其精度亦有限制。
At present, the thermodynamic properties of wet air are mostly used in China by the psychrometric chart (i-d) of wet air drawn by Tongji University Ventilation and Air Conditioning Research Institute in 1979. It has the advantages of being simple and practical and adopting both the SI system and the GM system. However, there are some problems as follows: (1) The pressure is only 500, 550, 600, 650, 700, 730, 745, 760mmHg eight kinds of conditions; (2) the temperature is only between -30 ° -65 ℃; (3) can be accessed on the map parameters are limited to pressure, temperature, relative humidity, moisture content, water vapor pressure, specific enthalpy and Dew point (or frost point) temperature, other parameters in the humid air than the specific humidity, specific entropy, thermodynamic wet bulb temperature can not be calculated; (4) check the curve to determine the parameters are not convenient, the accuracy is also limited.