一种高温空气湿度测量的方法

Method to measure humidity of high temperature air

基于能量平衡及质量平衡,提出了一种通过冷、热风混合测量高温空气湿度的方法。该方法通过温度传感器对冷风、混风的干湿球温度及被测高温空气干球温度进行测量,利用湿空气热力性质关系计算被测高温空气的湿度及各状态参数,也可由常规仪表对高温空气湿度进行测量。该方法具有测量简单、精度高、测量成本低、易于实现的优点。运用误差传递理论对该方法的合成误差进行了计算,结果表明,测量高温低湿(t≤140℃,φ≤15%)的空气湿度,其测量精度可达到±0·5%。

Based on the energy and mass balance principles, presents a new method to measure the humidity of high temperature air by mixing cold and hot air in which the dry and wet bulb temperature of the cold air and mixed air and the dry bulb temperature of high temperature air are measured by temperature sensors, then the humidity and other parameters of high temperature air can be found by the thermodynamic relationship. And the humidity can also be measured conventionally. The method has the advantages of easy measurement, high precision, low cost and easy realization. Calculates and analyses the integrated error based on the error transfer theory. The result shows that the precision of relative humidity for the high temperature（up to 140℃ ） and low humidity（up to 15%） air is within ± 0.5% by the proposed method.