The overall coefficient, lateral tank surface area, and temperature difference are combined to produce the convective–conductive heat loss. The result is scaled by 10⁻⁵ to produce the output unit.

\begin{equation}\label{eq:insulated-tank-conv-cond} q_{cc} = U \cdot A \cdot \Delta T \end{equation}

Symbols

\(q_{cc}\)	Convective–conductive heat loss \([\unit{ \btu\per\hour}]\)
\(U\)	Overall heat transfer coefficient ( \(U_{ins}\) or \(U_{bare}\)) \([\unit{ \btu\per\hour\foot\squared\degreeFahrenheit}]\)
\(A\)	Lateral tank surface area ( \(\pi,d,H\)) \([\unit{ \foot\squared}]\)
\(\Delta T\)	Temperature difference (surface – ambient) \([\unit{ \degreeRankine}]\)