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MEASUR-Tools-Suite v1.2.4
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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MEASUR-Tools-Suite v1.2.4
The MEASUR Tools Suite is a collection of industrial efficiency calculations written in C++ and with bindings for compilation to WebAssembly.
|
EEM functions are stateless free functions. Each function returns the adjusted airflow, power, energy, or cost value directly as a passive value object.
Airflow reduction from repairing compressed-air leaks.
\begin{equation}\label{eq:compressor-eem-leak-reduced} Q_{leak,red} = r_{leak}Q_{leak} \end{equation}
\begin{equation}\label{eq:compressor-eem-leak-use} Q_{use,adj} = Q_{use} - Q_{leak,red} \end{equation}
| \(Q_{leak,red}\) | Reduced leak airflow \([\unit{ \acfm}]\) |
| \(r_{leak}\) | Leak reduction fraction \([\unit{ \unitless}]\) |
| \(Q_{leak}\) | Baseline leak airflow \([\unit{ \acfm}]\) |
| \(Q_{use,adj}\) | Adjusted use airflow \([\unit{ \acfm}]\) |
| \(Q_{use}\) | Baseline use airflow \([\unit{ \acfm}]\) |
Adjusted use airflow from end-use efficiency improvements.
\begin{equation}\label{eq:compressor-eem-end-use} Q_{use,adj} = Q_{use} - Q_{red} \end{equation}
\begin{equation}\label{eq:compressor-eem-end-use-fraction} f_{use,adj} = \frac{Q_{use,adj}}{Q_{FL}} \end{equation}
| \(Q_{use,adj}\) | Adjusted use airflow \([\unit{ \acfm}]\) |
| \(Q_{red}\) | Average airflow reduction \([\unit{ \acfm}]\) |
| \(f_{use,adj}\) | Adjusted use airflow fraction \([\unit{ \unitless}]\) |
| \(Q_{FL}\) | Full-load airflow \([\unit{ \acfm}]\) |
Adjusted power and use airflow after pressure changes.
Pressure-reduction and cascading-set-point calculations use the same adjusted power and airflow equations. The exponent 0.283 is the legacy pressure-power relationship retained by this assessment.
\begin{equation}\label{eq:compressor-eem-pressure-power} P_{adj} = P_{FL} \frac{\left(\frac{P_{adj,FL}+P_{alt}}{P_{alt}}\right)^{0.283} - 1} {\left(\frac{P_{FL,g}+P_{atm}}{P_{atm}}\right)^{0.283} - 1} \end{equation}
\begin{equation}\label{eq:compressor-eem-pressure-airflow} Q_{use,adj} = Q_{use} - \left(Q_{use} - Q_{use}\frac{P_{adj,FL}+P_{alt}}{P_{FL,g}+P_{atm}}\right)0.6 \end{equation}
| \(P_{adj}\) | Adjusted full-load power \([\unit{ \kilo\watt}]\) |
| \(P_{FL}\) | Baseline full-load power \([\unit{ \kilo\watt}]\) |
| \(P_{adj,FL}\) | Adjusted full-load gauge pressure \([\unit{ \psig}]\) |
| \(P_{FL,g}\) | Baseline full-load gauge pressure \([\unit{ \psig}]\) |
| \(P_{alt}\) | Altitude pressure \([\unit{ \psia}]\) |
| \(P_{atm}\) | Atmospheric pressure \([\unit{ \psia}]\) |
| \(Q_{use,adj}\) | Adjusted use airflow \([\unit{ \acfm}]\) |
| \(Q_{use}\) | Baseline use airflow \([\unit{ \acfm}]\) |
| \(0.6\) | Legacy pressure-flow response factor \([\unit{ \unitless}]\) |
Demand, energy, and cost savings from reduced discharge pressure.
\begin{equation}\label{eq:compressor-eem-power-savings} P_{save} = P_{base} - P_{mod} \end{equation}
\begin{equation}\label{eq:compressor-eem-energy-savings} E_{save} = P_{save}H \end{equation}
\begin{equation}\label{eq:compressor-eem-cost-savings} C_{save} = E_{save}C_e \end{equation}
| \(P_{save}\) | Demand savings \([\unit{ \kilo\watt}]\) |
| \(P_{base}\) | Baseline adjusted power \([\unit{ \kilo\watt}]\) |
| \(P_{mod}\) | Modified adjusted power \([\unit{ \kilo\watt}]\) |
| \(E_{save}\) | Annual energy savings \([\unit{ \kilo\watt\hour}]\) |
| \(H\) | Annual operating hours \([\unit{ \hour}]\) |
| \(C_{save}\) | Annual cost savings \([\unit{ \dollar}]\) |
| \(C_e\) | Electricity cost \([\unit{ \dollar\per\kilo\watt\hour}]\) |
Modules | |
| Compressor EEM Leak Reduction Formula | |
| Airflow reduction from repairing compressed-air leaks. | |
| Compressor EEM End-Use Efficiency Formula | |
| Adjusted use airflow from end-use efficiency improvements. | |
| Compressor EEM Pressure Formula | |
| Adjusted power and use airflow after pressure changes. | |
| Compressor EEM Savings Formula | |
| Demand, energy, and cost savings from reduced discharge pressure. | |
Files | |
| file | compressor_eem.h |
| Compressor energy efficiency measure calculation declarations. | |
1.9.8