Start/Stop Compressor Assessment

Detailed Description

Start/stop control assumes average power is proportional to airflow fraction and to the average of full-load and maximum power fractions. Results are reported as calculated package power \([\unit{\kilo\watt}]\), airflow \([\unit{\acfm}]\), power fraction, and airflow fraction.

Start/Stop Power and Airflow

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Average power fraction for start/stop cycling.

\begin{equation}\label{eq:start-stop-average-fraction} f_{avg} = \frac{f_{P,FL} + f_{P,max}}{2} \end{equation}

\begin{equation}\label{eq:start-stop-power-from-airflow} P = f_{avg} f_Q P_{FL} \end{equation}

\begin{equation}\label{eq:start-stop-airflow-from-power} Q = Q_{FL}\frac{f_P}{f_{avg}} \end{equation}

Symbols

\(f_{avg}\)	Average cycling power fraction \([\unit{ \unitless}]\)
\(f_{P,FL}\)	Full-load power fraction \([\unit{ \unitless}]\)
\(f_{P,max}\)	Maximum power fraction \([\unit{ \unitless}]\)
\(P\)	Calculated package power \([\unit{ \kilo\watt}]\)
\(Q\)	Calculated airflow \([\unit{ \acfm}]\)
\(P_{FL}\)	Full-load package power \([\unit{ \kilo\watt}]\)
\(Q_{FL}\)	Full-load airflow \([\unit{ \acfm}]\)
\(f_P\)	Fraction of full-load power \([\unit{ \unitless}]\)
\(f_Q\)	Fraction of full-load airflow \([\unit{ \unitless}]\)

Modules
	Start/Stop Formula
	Average power fraction for start/stop cycling.

Files
file	start_stop_compressor.h
	Start/stop compressor assessment model declarations.