QUICK EVALUATION OF THE THERMODYNAMIC PROPERTIES OF WATER AND STEAM

The calculation of thermodynamic properties of water and steam is fami liar but sometimes too slow. Some older equations with lower precision s but faster calculation speeds are therefore tested. Some new simple equations for evaluating the thermodynamic properties of water and ste am are demonstrated. The deviations from precise equations are on aver age less than a few per cent if the calculations are made in some limi ted regions. Bigger deviations occur at the surrounding of the critica l point and in the evaluation of the specific volume. It is shown that a quick evaluation of thermodynamic properties of water, saturated va por and superheated steam is possible with these simple equations. The precision of the simple equations could be regulated by changing the size of the evaluated region.