Replacement of Ventilation Systems
Ventilation
Measure Goal
The goal of this document is to estimate the electricity savings that are triggered by the renovation of existing ventilation systems or their components.
Symbols, Terms and Units
| Symbol | Description | Unit |
|---|---|---|
E | annual electricity consumption | kWh/a |
ΔEeco | cumulative electricity savings | kWh |
feco | reduction factor | — |
Ns | standard effective duration | a |
qv | volume flow rate | m³/h |
Δp | total pressure difference | Pa |
Pm | mechanical power | kW |
t | operating hours | h/a |
η | efficiency | — |
Calculation Formulas
Creditable Electricity Savings
The creditable electricity savings result from the difference between the current and new annual electricity consumption, multiplied by the reduction factor (0.75) and the standard effective duration.
Jährlicher Energieverbrauch (detailliert)
The annual electricity consumption of a ventilation system depends on the volume flow rate, the total pressure difference and the operating time. The efficiencies of the components used (fan, transmission, motor, frequency converter) have a direct influence on energy consumption.
Jährlicher Energieverbrauch (vereinfacht)
If no more precise information about the old system is available, the energy consumption can be estimated using the rated data of the original motor (nameplate). Due to the higher level of inaccuracy, a flat discount factor of 0.75 is used here.
Examples and Scenarios
Replacement of fans (incl. drive system) of the entire ventilation system of a shopping center
Inputs
Verkauf, 150'000 kWh/a alt → 100'000 kWh/a neu
Replacement of a fan (incl. drive system) of the ventilation system of a school building
Inputs
Schule, 10 kW Motor, 2 Geschwindigkeiten → modulierende Regelung
Downloads
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