Tailored HVAC system for Stožice Sports Complex, Slovenia

With the construction of the Stožice complex, complete with an arena that seats 12,500, an imposing stadium with a 16,000 seat capacity, and its accompanying infrastructure, Ljubljana has at long last obtained sporting facilities which enable it to measure up to other European capitals. We are proud to have delivered the complete HVAC equipment for this sports complex, including a custom made air diffusion solution for the arena.

With the aid of an actual model in the Air distribution laboratory at our R&D center it was ascertained, that optimal conditions in the visitors area could be achieved if the OD-7ST air-supply element was built-in under every other seat in the arena, with a fixed angle of the blades of 45°and a nominal air flow of 42 m3/h. The total supplied air in the indoor arena is 240.000 m3/h. As as result of ventilating the arena by means of air displacement units approximately 30% of the energy, needed for heating and cooling could be saved.

In the central part the sporting arena of the complex, a suitable quantity of fresh air is supplied by supply nozzles VŠ-5. The effectiveness of air ventilation is directly dependent upon many subsystems and components which comprise the finished whole. So, an important segment in overall ventilation solutions is precise air flow control, especially in large structures, like Stožice Stadium. This is maintained by 94 square and circular electronic air flow volume controllers from the SimpLY family, which enable not only the very precise regulation of desired air speeds, but also the possibility of subsequently resetting any of the desired parameters. These units are also characterised by their low energy consumption, and are userfriendly.

For the preparation of primary air nine recuperative air handling units (indoor double-stage versions with rotary wheel, bypass, mixing block, water heater and cooler, cassette filter EU4) have been built in, with a total flow rate of 306.000 m3 /h, which ventilate the change rooms, corridors and entrance hall, the VIP lounges, conference areas for journalists and the banquet hall, and rooms for doping control and judges – all together an area of 5,900 m2. Secondary preparation and diffusion is carried out by ceiling cassette convectors, which have been placed all around the accompanying facilities. Intrusion of cold outside air is prevented by air curtains at all arena entrances.