The partial pressure (mole fraction) of water vapor is needed to determine saturation temperature and enthalpy for latent heat calculations.

\begin{equation}\label{eq:gas-flue-gas-material-partial-pressure-h2o-cpp} P_{H_2O} = \frac{V_{H_2O}}{V_{CO_2} + V_{H_2O} + V_{O_2} + V_{N_2}}\end{equation}

Symbols

\(P_{H_2O}\)	Partial pressure (mole fraction) of water vapor \([\unit{ \unitless}]\)
\(V_{H_2O}\)	Generated volume of water vapor \([\unit{ \cubicFoot\per\MMBtu}]\)
\(V_{CO_2}\)	Generated volume of CO2 \([\unit{ \cubicFoot\per\MMBtu}]\)
\(V_{O_2}\)	Generated volume of O2 \([\unit{ \cubicFoot\per\MMBtu}]\)
\(V_{N_2}\)	Generated volume of N2 \([\unit{ \cubicFoot\per\MMBtu}]\)