The fraction condensed is calculated using an empirical correlation based on the outlet flue gas temperature and oxygen content. The correlation accounts for the saturation characteristics of water vapor at different temperatures and oxygen concentrations. This represents the fraction of water vapor in the flue gas that condenses as the gas is cooled.

\begin{equation}\label{eq:air-water-cooling-flue-fraction-condensed} f_{cond} = 1 - \frac{0.0000009 \cdot T_{out}^{3.0136}}{2.8082 - 0.1168 \cdot O_{2}}\end{equation}

Symbols

\(f_{cond}\)	Fraction of water vapor condensed \([\unit{ \unitless}]\)
\(T_{out}\)	Flue gas outlet temperature \([\unit{ \degreeFahrenheit}]\)
\(O_{2}\)	Oxygen content in flue gas (as fraction, e.g., 0.03 for 3%) \([\unit{ \unitless}]\)

Note

The empirical coefficients 0.0000009, 3.0136, 2.8082, and 0.1168 are derived from experimental data for flue gas condensation behavior.