Resizing of Water Pump Systems with Constant Speed up to 75 kW
Pumps
Measure Goal
The goal is to estimate the electricity savings triggered by the redimensioning of water pump systems with constant speed up to 75 kW with demand analysis. This measure is relevant when the current efficiency of the pump itself is modest or the optimal efficiency does not match the current flow rate at all. A new pump designed for the new operating point maximizes efficiency while keeping flow rate and pressure minimal.
Symbols, Terms and Units
| Symbol | Description | Unit |
|---|---|---|
E | annual electricity consumption | kWh/a |
ΔEeco | cumulative electricity savings | kWh |
f | Factor | — |
Ns | Standard effective duration | a |
Δp | Differential pressure at pump connections | kPa |
Q | Flow rate | m³/h |
t | annual operating hours | h/a |
η_P | Pump efficiency | — |
η_M | Motor efficiency | — |
τ | average annual motor load | % |
Calculation Formulas
Stromverbrauch der aktuellen Pumpe
The electricity consumption of the current pump is calculated based on the measurement of the electrical power consumption by the system.
Stromverbrauch nach der Sanierung
The electricity consumption after renovation is calculated based on the actually required flow rate and the efficiencies of the new, redimensioned pump and motor.
Mittlere Motorlast
The average motor load is expressed as a function of the rated power of the motor and the required hydraulic power.
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