Calculates the energy correction associated with heating excess air, for both current and improved conditions. This correction accounts for the energy lost to heating air that does not participate in combustion.

\begin{equation}\label{eq:pheic-air-correction} AC = -\left(A_B + C_{p,air} \cdot T_{FG}\right) \cdot \frac{EA}{100}\end{equation}

\(AC\)	Air correction \([\unit{ \percent}]\)
\(A_B\)	Air correction base (-1.07891327) \([\unit{ \unitless}]\)
\(C_{p,air}\)	Air specific heat \([\unit{ \btu\per\pound\degreeFahrenheit}]\)
\(T_{FG}\)	Flue gas temperature \([\unit{ \degreeFahrenheit}]\)
\(EA\)	Excess air \([\unit{ \percent}]\)