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The Oborishte district is one of the older parts of the city of Sofia, the capital of Bulgaria. Within Oborishte, there is a mix of residential, commercial and office functions, as well as a mix of building types (pre-war detached houses and multi-family apartment blocks). This action envisages the renovation of five apartment blocks that are rather typical for building practice both in Sofia and Bulgaria around 1970. The buildings are prefabricated apartment buildings with 7 to 8 levels, locally known as ‘panel blocks’.

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Fellow city: Sofia

Sofia (1.3M inhabitants), capital city of Bulgaria, is a social and economic metropolitan centre contributing about 30% to the national GDP. Its ambition towards a smart city are laid down in the Sustainable Energy Action Plan 2012-2020 with integrated actions for the implementation of energy management, holistic energy planning and renovation of the building stock, integrated measures in the transport and waste management.

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Continental climate, with an average annual temperature of 10,6 °C.
The building is a two-floor multi-family 6 apartment dwelling that was completed in 1974. In 2004, a new part was added to the building. Total floor area is 564 m2. The annual final energy consumption related to the occupied apartments with a heated space of 336 m2 is 200 kWh/m2, of which 143 kWh/m2 from natural gas, 13 kWh/m2 from coal and 44 kWh/m2 from electricity. The annual heating and cooling demands are 117 kWh/m2 for space heating, 21 kWh/m2 for DHW and 58 kWh/m2 for space cooling

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