As stated, the SD, RES and HL strategies differ for control variables and required measurements at the valve, as reported in Table 1.
Summary of control variables and measurements required for each strategy
| Strategy . | Control variable . | Measurement . |
|---|---|---|
| SD | Valve shutter degree | Not required |
| RES | Valve shutter degree | Flow at the valve |
| HL | Head loss at the valve | Differential pressure at the valve |
| Strategy . | Control variable . | Measurement . |
|---|---|---|
| SD | Valve shutter degree | Not required |
| RES | Valve shutter degree | Flow at the valve |
| HL | Head loss at the valve | Differential pressure at the valve |