The equivalent energy supply is calculated by dividing the heat exchanger energy rate by the available heat of the low-temperature process.

\begin{equation}\label{eq:cascade-high-to-low-eq-energy-supply} E_{supply} = \frac{Q_{hx}}{AH_{low}}\end{equation}

Symbols

\(E_{supply}\)	Equivalent energy supply \([\unit{ \MMBtu\per\hour}]\)
\(Q_{hx}\)	Heat exchanger energy rate \([\unit{ \MMBtu\per\hour}]\)
\(AH_{low}\)	Available heat of low-temp process \([\unit{ \unitless}]\)