Runtime-weighted cycle power is calculated from the energy in each active stage. If the requested airflow is at or above the unload airflow, the model uses the modulation stage power directly.

\begin{equation}\label{eq:load-unload-average-power} P_{cycle} = \frac{E_{bd} + E_{off} + E_{reload} + E_{pump} + E_{mod}} {t_{bd} + t_{off} + t_{reload} + t_{pump} + t_{mod}} \end{equation}

Symbols

\(P_{cycle}\)	Average package power for the operating cycle \([\unit{ \kilo\watt}]\)
\(E_{bd}\)	Blowdown energy \([\unit{ \kilo\watt\second}]\)
\(E_{off}\)	Off-load energy \([\unit{ \kilo\watt\second}]\)
\(E_{reload}\)	Reload energy \([\unit{ \kilo\watt\second}]\)
\(E_{pump}\)	Reload pump-up energy \([\unit{ \kilo\watt\second}]\)
\(E_{mod}\)	Modulation energy \([\unit{ \kilo\watt\second}]\)
\(t_{bd}\)	Blowdown runtime \([\unit{ \second}]\)
\(t_{off}\)	Off-load runtime \([\unit{ \second}]\)
\(t_{reload}\)	Reload runtime \([\unit{ \second}]\)
\(t_{pump}\)	Reload pump-up runtime \([\unit{ \second}]\)
\(t_{mod}\)	Modulation runtime \([\unit{ \second}]\)