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Finding Pump Switching Stability
znetsixe edited this page 2026-05-11 22:24:29 +02:00
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| title | created | updated | status | tags | sources | ||||
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| Pump Switching Stability | 2026-04-07 | 2026-04-07 | proven |
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Note
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Pump Switching Stability
Concern
Frequent pump on/off cycling causes mechanical wear, water hammer, and process disturbance.
Test Method
Sweep demand from 5% to 95% in 2% steps, count combination changes. Repeat in reverse to check for hysteresis.
Results — Mixed Station (2x H05K + 1x C5)
Rising 5→95%: 1 switch at 27% (H05K-1+C5 → all 3) Falling 95→5%: 1 switch at 25% (all 3 → H05K-1+C5)
Same transition zone, no hysteresis.
Results — Equal Station (3x H05K)
Rising 5→95%: 2 switches
- 19%: 1 pump → 2 pumps
- 37%: 2 pumps → 3 pumps
Clean monotonic transitions, no flickering.
Why It's Stable
The marginal-cost refinement only adjusts flow distribution WITHIN a combination — it never changes which pumps are selected. Combination selection is driven by total power comparison, which changes smoothly with demand.