Low energy reconstruction and repurpose of existing building in former military complex
Koprivnica, Koprivnicko, Croatia
The subject of this project was the reconstruction and repurpose of existing building in the former “ban Krsto Frankopan” military complex in Koprivnica for the purpose of forming a study space for the Media University - journalism studies, media design studies and business and management studies in media. Former military complex "ban Krsto Frankopan" is intended for the establishment of the University Campus. The Kampus complex is ultimately designed as a complex in the concept of zero carbon dioxide emissions. The Kampus complex is intended to be a complex of zero carbon dioxide emissions. The investor's request was that the building must be a low-energy building.
- removing the existing wooden roof and forming a heat-insulated flat roof
- thermal insulation of external walls
- replacement of external windows and doors
- mechanical ventilation with heat recovery
Thermal reconstruction of the building envelope
The outer wall which consist of 38 cm solid brick or 30 cm brick block was thermally improved by 18 - 20 cm extruded polystyrene - XPS (U-value from 0.83 W/m²K to 0.14 W/m²K) and the outer wall of ventilated façade was thermally improved by 18 cm rock wool (U-value from 0.81 W/m²K to 0.21 W/m²K). The flat roof is also insulated with 24 cm extruded polystyrene - XPS (U-value from 1.24 W/m²K to 0.12 W/m²K). The existing wooden windows with an average U-value of 3.40 W/m²K were replaced by new PVC windows with a U-value of 1.16 W/m²K.
Mineral rock wool and extruded polystyrene (XPS) for facade insulation.
XPS for roof insulation.
The existing wooden windows with an average U-value of 3.40 W/m²K were replaced by new PVC windows with a U-value of 1.16 W/m²K.
Space heating and cooling via heat pumps (water – air). Heat pumps are using ground water heat.
Ventilation system: regarding the renovation, a mechanical ventilation system with heat recovery was installed in the university building to supply classrooms with air. The efficiency of the heat recovery amounts to approx. 82 %.
The project implies energy-efficient, sustainable reconstruction, using renewable energy sources, materials, constructions and systems that provide low energy consumption. Use of energy-saving lighting system.
Monitoring system has been installed. This allows energy consumption monitoring and also serves for the optimal adaptation of the building to the user behaviour.
This investment will provide numerous benefits such as quality learning conditions for students, low – energy costs, low CO2 emissions etc. Reconstruction and repurpose of the existing building will provide new space for the students of the Media University thus directly contributes to University complex expansion.
Energy cost reduction and low – energy standard were main requirements for the building reconstruction. It was the investor's wish to have a low – energy renovated building which will have low energy costs during the whole life-cycle of the building.