![]() Pw and Pws can be calculated from Method 1 just above, or from the method shown in the following sections below – Saturation Vapour Pressure, Pws, and Partial Vapour Pressure, Pw. RH can be derived from equation (4) above, where RH = Pw/Pws x 100%. To calculate Twb from Tdb and RH, there are 3 popular methods as shown below. Part 1: Calculating Air Properties from dry-bulb temperature, Tdb and relative humidity, RH Specific volume of moist air per mass of dry air, VdaĪpart from the theory and formulae, if you are interested to learn about the programming behind this excel calculator, you may visit this page: Using Excel Macros to compute Air Properties. In the following section, we will disclose the formulae involved for the computation of all parameters of air properties in this psychrometric calculator. Part 2 computes with dry-bulb temperature, Tdb, and wet-bulb temperature, Twb as the input parameters Part 1 computes with dry-bulb temperature, Tdb, and relative humidity, RH as the input parameters From the Excel File, the calculator consists of 2 parts
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