Fennerstrasse Project, Innsbruck
In Summer of 2022, in 48 apartments, a switch was made from individual boilers to a heat pump-boiler combination for hot water and heating as part of the thermal refurbishment.
Picture: https://www.ehpa.org/wp-content/uploads/2023/05/Heat-pumps-in-high-rise-homes_case-studies-from-across-Europe_EHPA_May-2023.pdf
Lessons learned
- The Fennerstrasse project will show just how much potential there is in the technology, which could serve as an important blueprint for renovating old buildings in the future,” said Josef Kurzmann, Vaillant sales manager.
- All those involved in the project agree that the mini-heat pump technology will provide valuable services in renovation projects in the future.
Key facts
| Building | Heat Pump and Source | ||
| Location | Innsbruck, Austria | Number of HP | 48 individual 1 central |
| Construction | 2022 | Installed power | 3 kW per individual hp |
| Heat distribution | radiators and mix | Operation mode | bivalent |
| Heated area | – m² | Heat source | air, internal loop |
| No. of apartments | 48 | ||
| Heating sytem | Domestic Hot Water | ||
| Heat demand | – / (m²a) | DHW demand | 26 kWh / (m²a) |
| Heating temperature | – °C | Type of system | central – decentral |
| Max. temperature | – °C | ||
| Other information | |||
| Refrigerant | R410A | SCOP | 4 |
| Sound level | 38 db | Model | geoTHERM 3kW |
Description of the technical concept
A large heat pump on the roof runs the collected energy with a flow temperature of only 20°C Celsius through the stairwells in a circulation system. In this way, the geoTHERM mini heat pumps installed in each apartment only have to increase the heat by a few degrees. By comparison, if the Fennerstrasse building were to rely on district heating supplied via the basement, the supply temperature would be 80°C and there would be high circulation losses.
The Vaillant mini heat pump system is designed for maximum heat demand and can be installed directly in individual apartments – even if they are equipped with radiators. This makes the system ideal for a multi-apartment building with very low heating requirements and normal hot water needs. The wall-mounted unit hardly differs from a gas boiler in size and appearance and is particularly quiet, at only 38 decibels in heating mode.
Together with a space-saving hot water storage tank, the geoTHERM mini also ensures a high level of hot water comfort.
AT002 Fennerstrasse