\begin{equation}\label{eq:wall-qconv} Q_\text{conv} = h A \Delta T\end{equation}

Convection Coefficient

\begin{equation}\label{eq:wall-h} h = f_\text{shape} \cdot f_\text{duty} \cdot f_{\Delta T} \cdot f_{\bar{T}} \cdot f_\text{wind}\end{equation}

Factors

\begin{equation}\label{eq:wall-duty} f_\text{duty} = \left(\frac{1}{24}\right)^{0.2}\end{equation}

\begin{equation}\label{eq:wall-dTfactor} f_{\Delta T} = (\Delta T)^{0.266}\end{equation}

\begin{equation}\label{eq:wall-Tbarfactor} f_{\bar{T}} = \left(\frac{1}{\bar{T}}\right)^{0.181}\end{equation}

\begin{equation}\label{eq:wall-windfactor} f_\text{wind} = \sqrt{1 + 1.277 \cdot v_\text{wind}}\end{equation}

Temperature Definitions

\begin{equation}\label{eq:wall-dT} \Delta T = T_s - T_a\end{equation}

\begin{equation}\label{eq:wall-Tbar} \bar{T} = \frac{T_s + T_a}{2}\end{equation}

Symbols

\(Q_\text{conv}\)	Convective heat loss \([\unit{ \btu\per\hour}]\)
\(h\)	Convection coefficient \([\unit{ \btu\per\hour\foot\squared\degreeFahrenheit}]\)
\(A\)	Surface area \([\unit{ \foot\squared}]\)
\(\Delta T\)	Temperature difference between surface and ambient \([\unit{ \degreeFahrenheit}]\)
\(f_\text{shape}\)	Shape factor \([\unit{ \unitless}]\)
\(f_\text{duty}\)	Duty factor \([\unit{ \unitless}]\)
\(f_{\Delta T}\)	Temperature difference factor \([\unit{ \unitless}]\)
\(f_{\bar{T}}\)	Mean temperature factor \([\unit{ \unitless}]\)
\(f_\text{wind}\)	Wind factor \([\unit{ \unitless}]\)
\(v_\text{wind}\)	Wind speed \([\unit{ \mile\per\hour}]\)
\(T_s\)	Surface temperature \([\unit{ \degreeFahrenheit}]\)
\(T_a\)	Ambient temperature \([\unit{ \degreeFahrenheit}]\)