Leisure facilities such as sports arenas, cinemas, concert halls and opera houses are extremely complex. Many activities often have to take place at the same time, without disturbing each other. All of these types of building bring different challenges regarding ventilation solutions.
In addition to a comfortable indoor climate, the sound requirements are often strict. Another common denominator is a strong focus on solutions with high energy efficiency.
Lindab has delivered ventilation solutions for a long list of different buildings in the leisure industry – many with exceptional requirements and highly specialised requests.
Leisure case – Copenhagen Opera House
“Tailor-made solution to meet the demanding needs of an exciting building”
Copenhagen’s new Opera House opened on 15 January 2005 and has a total area of 41,000 square metres, spread over 1,000 rooms and 14 storeys, five of which are subterranean. It was designed by Danish architect Henning Larsen and has two stages: the Main Stage and Takkelloftet. The Main Stage auditorium has capacity for an audience of up to 1,703, an orchestra pit for 110 musicians, and such technical and spatial possibilities that it undoubtedly ranks as one of the world’s most modern opera houses.
Extremely complicated project
Nordic consultant Rambøll and Henning Larsen Architects were jointly responsible for project planning of the opera house, and for consultancy services regarding the project’s extensive technical installations. Master of Engineering Jørn Treldal of Rambøll was responsible for all the HVAC installations. “A project of this kind is based on a lot of unique, fundamentally different solutions. The architectural ambitions were very high, and this in turn placed correspondingly high demands on all the technical solutions – from the facade cladding to the supply air system in the main auditorium,” explains Treldal.
Extreme acoustic standards
The noise requirement was set at a full PNC 15, which places very strict requirements on silencing, especially in the low frequency bands. In fact this is such a low sound level that it is inaudible to the human ear. Even measurement can cause problems. Since diffusers themselves always generate sound, this was one of the sound-critical products. Not only should PNC 15 be met, but it should also be combined with the architect’s firm ideas about the design and appearance of the actual diffusers.
Full-scale test in Lindab’s own laboratory
In order to measure and develop the supply air solution for Copenhagen Opera House, Lindab built two complete full-scale models for both the stalls and balcony with a total of 24 diffusers. This gave us every opportunity to measure and document air streams, sound pressure and required output in an efficient, true-to-life way, so that we could then present a finished solution to the owner, consultant and architect.
All the diffusers in the main auditorium receive supply air from large pressure chambers beneath the seats, which are linked to the fan unit via duct systems and silencers. Placing the supply air beneath the seats is now common practice in auditoriums of this type. Over 1,700 Lindab diffusers, many of which have customised grilles for the building’s curvature, supply the building’s 41,000 square metres with fresh air.