Wilsdruff, Germany
Two multi-family buildings (MFBs) were built in the town of Wilsdruff near the city of Dresden. They have different sizes and were approached architecturally differently but still, both buildings have identical heating concepts.
Keeping the systems quiet was crucial because the MFBs lie in a neighborhood with especially strict noise control regulations. Thanks to specifically designed fan blades the sound level never goes above 58 dB(A), even when the system is running on full load.
Even before the German Gebäudeenergiegesetz GEG (Buildings Energy Act) was reformed, the planners decided to go for the hybrid heating concept of heat pumps and gas boilers. The technical and financial advantages were decisive, promising high efficiency and low costs.
Choosing heat pumps even without regulations in mind proves that this technology already makes sense from a economic and a practical point of view.
Lessons learned
- Regulations are not the only driver for installing heat pumps. Economic and practical advantages are plenty.
Key facts
| Building | Heat Pump and Source | ||
| Location | Wilsdruff, Germany | Number of HP | 2 (1 for each building) |
| Construction | 2022 | Operation mode | bivalent |
| No. of buildings | 2 | Heat source | air |
| Level of insulation | good | Type of system | central |
| Heated space | 320 m² 550 m² | Model | BRÖTJE BLW NEO 12 & 18 |
| Installed power | 12 kW 16 kW | ||
| Heat distribution | underfloor | ||
| Other information | DHW | ||
| Climate Zone | Cfb | Device | Central gas con- densing boilers |
| COP | 4.02 (12) 4.25 (18) | ||
| Refrigerant | R410A | ||
Description of the technical concept
Space Heating (SH) is provided in each building by a central heat pump. Additionally a gas condensing boiler is equipped in each MFB that serve purely for the production of DHW.
(Buffer) storages are not included in the flow chart.
DE015 Two Different Buildings, Two Identical Systems
Case study delivered by: Bundesverband Wärmepumpe bwp BWP-Datenbank | Bundesverband Wärmepumpe (BWP) e.V.