Enthalpy and Heat Content

For each constituent in the flue gas, calculate the enthalpy or heat content based on temperature and mass flow. Water vapor requires special treatment due to latent heat of condensation.

Water Vapor Enthalpy

\begin{equation}\label{eq:gas-flue-gas-material-enthalpy-h2o-cpp} H_{H_2O} = (h_{sat} + Cp_{H_2O} \cdot (T_{fg} - T_{sat})) \cdot 100 \cdot W_{H_2O}\end{equation}

Dry Gas Heat Content

\begin{equation}\label{eq:gas-flue-gas-material-heat-content-co2-cpp} H_{CO_2} = Cp_{CO_2} \cdot \Delta T_{fg,amb} \cdot 100 \cdot W_{CO_2}\end{equation}

\begin{equation}\label{eq:gas-flue-gas-material-heat-content-n2-cpp} H_{N_2} = Cp_{N_2} \cdot \Delta T_{fg,amb} \cdot 100 \cdot W_{N_2}\end{equation}

\begin{equation}\label{eq:gas-flue-gas-material-heat-content-o2-cpp} H_{O_2} = Cp_{O_2} \cdot \Delta T_{fg,amb} \cdot 100 \cdot W_{O_2}\end{equation}

Symbols

\(H_{i}\)	Heat content of constituent i \([\unit{ \btu\per\hour}]\)
\(h_{sat}\)	Enthalpy at saturation - see Calculate Enthalpy At Saturation Formula \([\unit{ \btu\per\pound}]\)
\(T_{sat}\)	Saturation temperature - see Calculate Saturation Temperature Formula \([\unit{ \degreeFahrenheit}]\)
\(Cp_{i}\)	Specific heat of constituent i \([\unit{ \btu\per\pound\degreeFahrenheit}]\)
\(T_{fg}\)	Flue gas temperature \([\unit{ \degreeFahrenheit}]\)
\(T_{amb}\)	Ambient temperature \([\unit{ \degreeFahrenheit}]\)
\(\Delta T_{fg,amb}\)	Flue gas temperature rise above ambient (T_{fg} - T_{amb}) \([\unit{ \degreeFahrenheit}]\)
\(W_{i}\)	Generated weight of constituent i \([\unit{ \pound\per\MMBtu}]\)
\(100\)	Conversion factor \([\unit{ \unitless}]\)