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Interventions and Expected Results

In the selected district area, none of the buildings have insulation on the wall, and very poor insulation on the roof where most of them deal with leakage problem. Central heating system is being used.

The average residential conditions per dwelling are:

  • 120 m2 heated area
  • Concrete construction
  • Poorly insulated - no insulation on façades, only some roof insulations
  • Small windows
  • Dwellings do not take advantage of natural light or ventilation
  • Central heating, no cooling


According to these existing conditions two different retrofitting strategies are proposed. The first strategy consist of application of passive design strategies on the building envelope by changing or adding defined building elements such as integrating sun shading devices and insulation. These include:

  • Retrofitting the south facing façades with applications of very innovative facade design to take advantage of solar gain, natural ventilation, day-lighting
  • Retrofitting the building envelope to integrate insulation; roofs, walls and windows.


The second strategy consists of integration of active design strategies such as integrating PV as a renewable technology and includes:

  • Innovative way of PV roof integration, considering PV as a part of the building material.
  • Innovative integration of monitoring systems for providing the best inside comfort conditions and energy saving. Results will be monitored and demonstrated.
  • Integration of smart grid system.


In the Demo Site Area, the buildings are heated by a central heating system. A local heating boiler is directly connected to radiator systems inside the buildings. Soma lignite is used as a fuel in the local central boiler. Isolation on the piping between the boiler and the building is timeworn. There is no control and energy measuring equipment in the overall heating system. Total fuel consumption cost is equally shared among the dwellings. Hot top water is also supplied to the buildings from the central boiler.

Soma Power Plant has enough surplus heat not only for Soma Power Plant Lodging Buildings, but also for overall City of Soma. Heat demand of the district heating system will be supplied by Soma Thermal Power Plant surplus heat.

In order to utilize waste heat in Soma Power Plant, a technical conversion is needed. This conversion in the power plant is completed, being ready to connect and adapt to the DH system. In the CITyFiED project, total heat demand of the buildings in the demo site will be supplied from the thermal plant heat supply system.

Between the demo site and the thermal plant there is no transmission line. Within the CITyFiED project, a new transmission line (nearly 4 km) will be implemented. In addition, in the demo site there is a distribution system and other district heating components for new DH: new distribution system and other DH components (pump stations, control systems, building substations etc.) will be established. Old type local heating system and piping systems will be replaced: a heat accumulation system will be established to optimize heat supply energy and energy demand. Finally, the heat supply security will be maintained.

Energy efficiency measures

  • Façade renovation
  • District heating (heat recovery – Soma Thermal Plant)
  • Photovoltaic roof integration
  • Smart grid
  • Monitoring platform


Expected Results


Demand Reduction

Reduction of CO2 Emissions

% of Demand Reduction

% of Reduction of CO2 Emissions


1.696 GWth/year

190 tons/year



District Heating/Cooling

7.3 GWth/year

5,000 tons/year



Smart Grids

0.42 GWeh/year





9 GWth/year 0.42 GWeh/year

5190 tons /year