\begin{equation}\label{eq:compressed-air-pressure-reduction-energy-cost} C_{energy} = E_{use} \cdot r_{elec}\end{equation}

Symbols

\(C_{energy}\)	Annual energy cost \([\unit{ \dollar\per\year}]\)
\(E_{use}\)	Annual energy use \([\unit{ \kWh\per\year}]\)
\(r_{elec}\)	Electricity cost rate \([\unit{ \dollar\per\kWh}]\)