MEASUR-Tools-Suite v1.0.11
The MEASUR Tools Suite is a collection of industrial efficiency calculations written in C++ and with bindings for compilation to WebAssembly.
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\begin{equation}\label{eq:opening-total-heat-loss} Q_\text{open} = \varepsilon \sigma A (T_\text{in}^4 - T_\text{amb}^4) \cdot F \cdot \frac{t_\text{open}}{100}\end{equation}

Symbols
\(Q_\text{open}\)Opening heat loss \([\unit{ \btu\per\hour}]\)
\(\varepsilon\)Surface emissivity \([\unit{ \unitless}]\)
\(\sigma\)Stefan-Boltzmann constant \([\unit{ \btu\per\hour\foot\squared\degreeRankine\tothe{4}}]\)
\(A\)Opening area \([\unit{ \foot\squared}]\)
\(T_\text{in}\)Inside temperature \([\unit{ \degreeRankine}]\)
\(T_\text{amb}\)Ambient temperature \([\unit{ \degreeRankine}]\)
\(F\)Radiative view factor \([\unit{ \unitless}]\)
\(t_\text{open}\)Percent time open \([\unit{ \unitless}]\)