Cuxhaven, Germany
The “Eigentümergemeinschaft Cuxhaven-Döse” (owners’ association Cuxhaven-Döse) initiated a full refurbishment of a two-part multi-family building (MFB). It had originally been built in the span of 1935 to 1938 and received a complete thermal renovation.
The External Thermal Insulation Composite System (envelope/façade) has been brought up to date, the thermal insulation of the roof was renewed, all the windows and doors were replaced, and electrical sun blinds were installed. All these measures in combination led to the building conforming with the Effizienzhaus 70 standard.
The statics of the building had to be adapted so that the added weight from the underfloor heating systems in the upper level apartments would not pose a threat.
Lessons learned
- Static reconfiguration of the building was necessary in order to accommodate the additional weight from the underfloor heating in the upper levels.
Key facts
| Building | Heat Pump and Source | ||
| Location | Cuxhaven, Germany | Number of HP | 2 (1 for each building half) |
| Construction | 1938 | Operation mode | monoenergetic |
| Retrofit | 2023 | Heat source | air |
| No. of buildings | 1 | Type of system | central |
| Level of insulation | good | Model | NIBE F2120-16 |
| Heated space | 560 m² | Installed power | 2 x 16 kW |
| Heat distribution | underfloor | ||
| Other information | DHW | ||
| Climate Zone | Cfb | Apartment provision | Fresh Water Stations |
| SCOP (35/55) | 5.1/3.9* | ||
| Refrigerant | R410A | ||
Description of the technical concept
The building is divided into two halves. For each, a central air-to-water heat pump with a control unit was installed and connected to a 700l buffer storage.
For domestic hot water (DHW), each single dwelling was equipped with Clage fresh-water transfer stations.
DE011 – Wholly Renovated with Apartment Transfer Station
Case study delivered by: Bundesverband Wärmepumpe bwp BWP-Datenbank | Bundesverband Wärmepumpe (BWP) e.V.