CONSTRUCTION OF PSYCHROMETRIC CHARTS FOR SYSTEMS OTHER THAN WATER-VAPOR IN AIR

The theory behind the construction of psychrometric charts for any two -component system is described and discussed. This theory is then appl ied to prepare psychrometric charts for the air-water, air-benzene and the air-toluene systems at different pressures. The behaviour of the vapour phase is characterised by the Virial Equation of State truncate d at the third term. The solubility of air in liquid water, benzene an d toluene is also considered. The charts are constructed with the dry bulb temperature and absolute humidity scales as the orthogonal axes. Curves of constant adiabatic saturation temperature, constant relative humidity, constant gas specific volume and constant enthalpy deviatio n are plotted on the charts. The charts are prepared by programming di rectly on a high resolution, 600 dots per inch, Postscript laser print er. This ensures that all data is plotted with precision.