Psychrometric charts for six different systems involving condensing hy
drocarbon vapour in nitrogen are presented The hydrocarbons considered
are benzene, toluene, acetone, n-pentane, n-hexane and cyclohexane. T
he charts are based upon semi-theoretical equations and make use of pu
blished physical property data and correlations. The behaviour of the
vapour phase is characterised by the Virial Equation of State truncate
d at the third term. The solubility of nitrogen in the liquid hydrocar
bons is also considered. The charts are constructed with the dry bulb
temperature and absolute humidity scales as the orthogonal axes. Curve
s of constant adiabatic saturation temperature, constant relative humi
dity, constant gas specific volume and constant enthalpy deviation are
plotted on the charts.