Pump Energy Management in InfoSWMM and H2OMap SWMM
InfoSWMM H2OMap SWMM offers comprehensive energy management capabilities to assist in minimizing energy consumption and identifying optimal pump scheduling and operating policies. Since the only device imparting energy to a collection system is a pump, all energy management features are pump specific.
Several important properties of the energy management tools include:
- The user can perform energy management simulations for any pump assigned energy data.
- Energy costing simulation results can be reviewed and analyzed using the output report manager .
- Use the scenario manager to save and quickly load alternative energy sets.
The energy management module calculates all essential electricity costs for pumping stations. It handles time-varying energy rates and demand charges for pumps in the system. To perform an energy management analysis, the following data is needed for pumps. In addition, the Run Energy Management Simulationoption should be checked on the advanced page of the simulation options dialog box as shown below.
Energy Data – Information regarding energy charge are required to estimate pumping costs. These information are specified using the energy data dialog box shown below. To initiate the dialog box, select the pump and click on the under the Attribute Browser.
- Energy Rate Pattern is describes the energy charge rate per KWh ($/kWh). If the energy charge rate is the same across all KWh, then the constant rate option may be used to define the rate.
- Demand Rate Pattern is describes charge rate per maximum KW of power consumed. It represents the higher rate energy companies charge the user for consuming energy during peak hours as a means to discourage power consumption during peak hours. If the charge rate does not vary with time, then constant rate option may be used.
Pump Efficiency Data – A pump efficiency data is needed to determine the energy consumed by a pump to delivery a known flow amount. The relationship between the pump efficiency and flow can be expressed in the form of a curve.
Defining Speed Ratio – Refers to the speed ratio that the pump is running with.
Efficiency Curve Types
Constant efficiency – If efficiency of the pump is same across all flow ranges, then the constant efficiency option could be used.
Quadratic Curve – The efficiency curve is described using a quadratic equation derived from the three points specified by the user.
Muli-Point Curve – The efficiency curve is described using a multiple points specified by the user ( sample curve is shown below).
Useful Power Curve for each pump.
Energy Cost Curve – Pumping cost is generated for each pump that has energy data and efficiency data assigned to it. The pumping cost is calculated based on the flow and the head determined for each pump during the simulation and based on the pump efficiency data and energy rate data defined for the pump. Energy cost curve would be generated only if energy rate data and efficiency data is assigned to the pump.
Pump Operation Curve – On the pump curve, operational point of the pump at every report time step is indicated across the simulation duration.