Simple Methods for Determination of Wet-Bulb Temperature and Dew-Point Temperature

Simple and precise methods for accurate calculation of wet �bulb temperature is presented for known values of dry-bulb temperature and relative humidity. In the present paper, the equations for determining dew point temperature for the entire pressure range (611.213 Pa to 47389.26 Pa) are also given. The equations proposed here for saturation vapour pressure for temperature range ( 0�C to 80�C) has an average error of 0.03 % only and the same equation can be rewritten to determine the value of dew-point temperature. The deviation in calculated values of wet-bulb temperature ranged from -0.238 to 0.458�C with mean absolute error of 0.167 for RH value of 50 % while deviation in calculated values of wet-bulb temperature ranged from -0.139 to 0.481�C with mean absolute error of 0.119 for RH value of 20 %. The proposed method for wet-bulb temperature led to an average error of 0.559 % for RH value of 50 % and 0.358 % for RH value of 20 % as compared to ASHRAE approximation. The present method for calculation of wet-bulb temperature can remove a large number of iteration and provide a high degree of computational ease.