Measuring Error Analysis of Relative Humidity and Calculation of Psychrometric Coefficient at High TemperatureHuang XiaoYin;Xu LiFenHuang XiaoYin;Xu LiFenAbstract:The relationship between psychrometric coefficient A and ambient temperature was studied. It was pointed out that when temperature is higher than 40 ℃ , the error of the relative humidity obtained according to the formula of psychrometric coefficient A increases with temperature. It is more evident when temperature is higher and relative humidity is lower. A new formula of coefficient A was presented and it has higher veracity. Tests indicate that the error of the relative humidity obtained according to the new formula is lower than 1.4 % RH.[著者文摘]