The flue gas heat capacity rate is the product of the mass flow rate and specific heat. This represents the thermal capacity of the flue gas stream to transfer heat.

\begin{equation}\label{eq:water-heating-flue-gas-heat-capacity} \dot{C}_{flue} = C_{p,flue} \cdot \dot{m}_{flue}\end{equation}

Symbols

\(\dot{C}_{flue}\)	Flue gas heat capacity rate \([\unit{ \kilo\joule\per\hour\kelvin}]\)
\(C_{p,flue}\)	Flue gas specific heat \([\unit{ \kilo\joule\per\kilogram\kelvin}]\)
\(\dot{m}_{flue}\)	Flue gas mass flow rate \([\unit{ \kilogram\per\hour}]\)