“The new tropical conservatory at the Botanical Gardens in Aarhus is like a drop of dew in its green surroundings. Its transparent dome set on an oval base extends the existing greenhouse built in 1969. A special feature of this structure is that is allows for the greatest interior volume with the lowest possible surface area, leading to high energy efficiency. The support structure consists of 10 steel arches, which fan out around a longitudinal and a transverse axis, creating a net of rectangles of varying sizes. formTL planned and designed a cover for these arches made mainly of double-layered ETFE cushions, which are affixed with biaxially bent profiles due to their complex structure. On the south-facing side, the cushions used were made with three layers, two of which were printed. Through changes in pressure, the relative positions of these printed foils can be adjusted. This can reduce or increase, as desired, the translucence of the cushions, changing the light and heat input of the building.
Cushion surface area: 1,800 mÂ² Base area: 1,145 m2
Dimensions Rise of arches up to 17.5 m Span of arches up to 41 m
Materials Nowofol ETFE foil, strengths of 150 Âµm and 250 Âµm Biaxially bent cushion edge profiles made of aluminium
Client : Universitets- og Bygningsstyrelsen (Danish University and Property Agency), Copenhagen (DK) Architect : C.F. MÃ¸ller, Aarhus (DK) Steel load-bearing structures : SÃ¸ren Jensen, Silkeborg (DK) Foil cushion planning : formTL GmbH, www.form-TL.de Fitter : CenoTec GmbH Textile Constructions GmbH, Greven (D) Supplier : Nowofol Kunststoffprodukte GmbH & Co. KG, Siegsdorf (D)” Photos: Quintin Lake. form-TL.de