Replacement of Uninterruptible Power Supply (UPS) Systems
Power Supply
Measure Goal
The goal is to estimate the electricity savings triggered by replacing an uninterruptible power supply (UPS) system with a new and more energy-efficient model.
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 |
PUPS | rated electrical power of the UPS system | kW |
Pload | electrical power of the load | kW |
fload | average annual UPS load | — |
ε_W | weighted efficiency of the UPS system | — |
Calculation Formulas
Creditable Electricity Savings
The creditable electricity savings result from the difference between the annual electricity consumption before and after the renovation, multiplied by the reduction factor (0.75) and the standard effective duration.
Annual Electricity Consumption
The annual electricity consumption of a UPS system is calculated based on the installed power of connected loads, the average annual utilization factor, and the weighted efficiency of the UPS system.
Examples and Scenarios
Replacement of a VFI type UPS system with a new, more energy-efficient model
Inputs
125 kW Nennleistung, 92% gewichtete Effizienz
Downloads
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