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EFFECT OF DIFFERENT SATURATED WATER VAPOR PRESSURE FORMULAS ONOUTDOOR WET BULB TEMPERATURE CALCULATION
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摘要: 通过试算法计算湿球温度，分别采用Goff-Cratch、Hyland-Wexler、Magnus-Teten、Murphy-Koop、改良Buck、Buck这6种饱和水汽压计算式来计算饱和水汽压。首先，利用干球温度范围为-15~40℃、相对湿度范围为5%~100%、大气压为1 013.25 hPa共1 120组数据，对比6种饱和水汽压计算式下的计算湿球温度与查焓湿图得到的湿球温度，得出：相对湿度为5%、30%时，湿球温度的平均误差最大相差0.01℃；干球温度为-15~0℃时，湿球温度的平均误差最大相差0.01℃；整体来看，平均误差均为0.59℃，均方根误差均为1.02℃；然后，利用人工观测的干球温度、相对湿度以及大气压，对比6种饱和水汽压计算式下的计算湿球温度与人工观测湿球温度，得出：6种饱和水汽压计算式下的计算湿球温度均相等，且具有相同的误差。最后，综合两者对比结果，得出：在误差不超过0.01℃的精度下，可认为6种饱和水汽压计算式对室外湿球温度的计算没有影响；在室外湿球温度的计算中，可选择6种饱和水汽压计算式之一来进行饱和水汽压的计算。Abstract: The wet bulb temperature was calculated by trial method. Goff-Cratch, Hyland-Wexler, Magnus-Teten, Murphy-Koop, modified Buck and Buck were used to calculate the saturated vapor pressure. First of all, 1 120 sets of data were used, including dry bulb temperature range of -15~40 ℃, relative humidity range of 5%~100% and atmospheric pressure of 1 013.25 hPa. By comparing the calculated wet bulb temperatures obtained by the six calculation formulas of saturated water vapor pressure with the wet bulb temperature obtained from the h-d diagram, it was concluded that when the relative humidity was 5%, 30%, the maximum difference of the average error of the wet bulb temperature was 0.01; when the dry bulb temperature was -15~0 ℃, the maximum difference of the average error was 0.01; the average error was 0.59, and the root mean square error was 1.02; then, based on the dry bulb temperature, relative humidity and atmospheric pressure observed manually, comparing the calculated wet bulb temperatures obtained by the six formulas of saturated water vapor pressure with the manually observed wet bulb temperature, it was concluded that the calculated wet bulb temperature under the six formulas of saturated water vapor pressure was equal and had the same error. Finally, based on the comparison of the two results, it could be concluded that: with the accuracy of error less than 0.01, the six calculation formulas of saturated water vapor pressure had no influence on the calculation of outdoor wet bulb temperature; for the calculation of outdoor wet bulb temperature, one of the six calculation formulas of saturated water vapor pressure could be selected for the calculation of saturated water vapor pressure.
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