Sønderborg, Denmark

Smart and flexible homes embedded in district energy system

The Danish demo case is called SAB Department 22 Kløvermarken/Hvedemarken and is located in the central part of the city of Sønderborg.

In 2010, the buildings were renovated with more insulation, new low-energy windows, new radiator systems and new district heating substations with heating controls connected to Danfoss Portal. There are nine substations covering the 19 apartment blocks.

In 2017, more than 3,000 m² solar PV panels were integrated in the roofs of all 19 apartment buildings. The solar PV system can produce 460 kW solar electricity corresponding to 408,000 kWh per year, covering 37 % of the total electricity consumption in the 432 apartments. At the same time, new LED outdoor lamps were implemented in the area around the 19 apartment blocks as well as in the corridors and basement.

In 2021, storage batteries were added to all the solar panels. They have a storage capacity of between 10 and 30 kWh depending on the number of apartments in each block. In addition, Danfoss Lean Heat system was implemented in all buildings using artificial intelligence to control and monitor the centrally heated buildings.

Innovation cluster

ProjectZero (developer), Sønderborg Andelsboligforening, Danfoss, Center Denmark, ENFOR, DTU

Key data

Renovation of 19 apartment buildings with three floors
432 apartment units
Plot area: 11 000 m²
Floor area: 32 000 m²
Year of construction: 1970-1973

Technologies and innovations

Reduction of district heating return temperatures from multi-flat buildings focusing on the heating system (radiator level) as well as the domestic hot water (DHW) system (sub-station level).
1 block will be supplied with new equipment for radiators and for DHW, and 1 block will function as reference. Both blocks will be monitored and evaluated.
Involvement of tenants and citizens: The energy saving results of the planned innovative energy technologies depend significantly on the daily energy performance of the tenants in the demo buildings.
Monitoring and evaluation of the combined solar PV and battery system in the demo buildings.
Implementation of Smart Lighting Control System in apartments.
Demonstration of intelligent and flexible management of the district heating network in the demo city area.

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