The building has an air-conditioning system with mechanical supply and exhaust ventilation and
chilled beams. The building is connected to Turku area district heating and district cooling distribution
systems. The temperature of water in the district heating main varies between 65°C and
115°C for the supply and between 40°C and 60°C for the return water, depending on the heat demand.
In the district cooling network the delivery temperature is +7°C and the return temperature
+17°C. District cooling water is produced with free cooling (outdoor air) and compressor technology.
All the heating and cooling systems in the building are connected indirectly to the district networks through heat exchangers. Heat extracted from the district heating network is used in the building for domestic hot water and space heating through central air handling units and hot water radiators. The district cooling water system
serves both the central air handling units and chilled beam units installed in the open-plan and
cellular office spaces. The chilled beam units have integrated, control equipment, supply air
cooling heat exchangers, fluorescent lighting and a communication link to building management system
(BMS). Outside normal office hours, the BMS sets lights in the units by default to ¼ power and lighting
demand is controlled by IR motion-sensors. Ventilation and air conditioning strategy: The building is divided into five ventilation zones.
YIT Office Building is a typical modern five-storey office building and was completed in October
2005. The ground floor (900 m²) serves as a workshop and storage facility and the remaining four
floors (6 000 m²) have both open-plan and cellular office spaces. There is a large glass roofed
atrium in the centre of the building extending from the first floor to the roof. In the lower part of
the atrium (at the second floor) there is a cafeteria and a small kitchen (the second floor partly covers the atrium). A total net floor area of the building is 6 906 m² with a total volume of 34 000 m³.