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DWD Power Exploration

Notes​

  • In EpanetConsoleCore, we've only coded to allow for power in Pumps.
  • Old documentation seems to indicate that Pipes should have power values as well.

Old Documentation​

The following image is taken from "RMX Users Manual-Jan2014.docx", found in DropBox. rmx power in users manual 2014

The following image is taken from "RMX Function Specifications_Nov2013.docx" in DropBox. rmx power in func specs 2013

EPANET Enums​

/// Link properties
/**
These link properties are used with @ref EN_getlinkvalue and @ref EN_setlinkvalue.
Those marked as read only are computed values that can only be retrieved.
*/
typedef enum {
  EN_DIAMETER     = 0,  //!< Pipe/valve diameter
  EN_LENGTH       = 1,  //!< Pipe length
  EN_ROUGHNESS    = 2,  //!< Pipe roughness coefficient
  EN_MINORLOSS    = 3,  //!< Pipe/valve minor loss coefficient
  EN_INITSTATUS   = 4,  //!< Initial status (see @ref EN_LinkStatusType)
  EN_INITSETTING  = 5,  //!< Initial pump speed or valve setting
  EN_KBULK        = 6,  //!< Bulk chemical reaction coefficient
  EN_KWALL        = 7,  //!< Pipe wall chemical reaction coefficient
  EN_FLOW         = 8,  //!< Current computed flow rate (read only)
  EN_VELOCITY     = 9,  //!< Current computed flow velocity (read only)
  EN_HEADLOSS     = 10, //!< Current computed head loss (read only)
  EN_STATUS       = 11, //!< Current link status (see @ref EN_LinkStatusType)
  EN_SETTING      = 12, //!< Current link setting
  EN_ENERGY       = 13, //!< Current computed pump energy usage (read only)
  EN_LINKQUAL     = 14, //!< Current computed link quality (read only)
  EN_LINKPATTERN  = 15, //!< Pump speed time pattern index
  EN_PUMP_STATE   = 16, //!< Current computed pump state (read only) (see @ref EN_PumpStateType)
  EN_PUMP_EFFIC   = 17, //!< Current computed pump efficiency (read only)
  EN_PUMP_POWER   = 18, //!< Pump constant power rating ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  EN_PUMP_HCURVE  = 19, //!< Pump head v. flow curve index
  EN_PUMP_ECURVE  = 20, //!< Pump efficiency v. flow curve index
  EN_PUMP_ECOST   = 21, //!< Pump average energy price
  EN_PUMP_EPAT    = 22, //!< Pump energy price time pattern index
  EN_LINK_INCONTROL = 23,  //!< Is present in any simple or rule-based control (= 1) or not (= 0)
  EN_GPV_CURVE    = 24  //!< GPV head loss v. flow curve index
} EN_LinkProperty;

Console Core (C#) Code​

        // From EpanetWrapperLinks.cs
        public double GetPumpPower(int index)
        {
            double value = 0;
            if (EN.EN_getlinkvalue(this.Project, index, (int)EN_LinkProperty.EN_PUMP_POWER, ref value) == 0)
            {
                return value;
            }
            return 0;
        }
  • We DO have a section for power in pipe hydraulics, but it's hardcoded to 0 at this time.
  • From what I'm seeing, this might be due to the fact that the C enum was explicitly "EN_PUMP_POWER". However, this might be similar to the reservoir head situation (same enum that's misleadingly named).
  • NEVER MIND! I don't think it's similar. The C code explicitly checks for type PUMP when it does the power calculations. I suspect, then, that the power for pipes in RMX was custom calculated.