HZ-02b
Version 2.0
Replacement
Replacement of Hot Water Circulation Pumps in Buildings
Heating Technology
Measure Goal
The goal is to estimate the electricity savings triggered by replacing hot water circulation pumps in buildings with more efficient and smaller models.
Symbols, Terms and Units
| Symbol | Description | Unit |
|---|---|---|
E | annual electricity consumption | kWh/a |
ΔEeco | cumulative electricity savings | kWh |
Ė | electrical power consumption | kW |
Ns | Standard effective duration | a |
ton | annual operating hours | h/a |
Calculation Formulas
Cumulative Electricity Savings
ΔEeco = (Eold - Enew) × feco × Ns
The cumulative electricity savings result from the difference between the electricity consumption of the old and new state, multiplied by the reduction factor and the standard effective duration.
Annual Electricity Consumption
Ex = ton × (ft,100% × Ė_100%,x + ft,75% × Ė_75%,x + ft,50% × Ė_50%,x + ft,25% × Ė_25%,x)
The annual electricity consumption is calculated based on the electrical power consumption at different partial loads and the annual operating hours.
Examples and Scenarios
Scenario A
Savings
Replacement of a hot water circulation pump in a multi-family building
Variable je nach Gebäudegröße
kWh
Inputs
Länge der Zirkulationsleitungen oder Energiebezugsfläche
Downloads
Documentation (PDF)
Complete technical documentation including calculation basis
Excel Calculator (XLSX)
Interactive calculation tool for savings
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