Vienna Sports Arena

From an energy perspective, the building is based on geothermal energy combined with thermally activated slabs and floor plates. The solid reinforced concrete structure acts as a thermal storage mass. Separate heating or cooling systems within the rooms are therefore not required. This reduces technical installations, maintenance requirements, and material consumption. The low system temperatures improve overall efficiency in combination with the geothermal system.

Energy supply key figures:
- 75 geothermal probes
​​​​​​​- 150 m depth
- 607 kW heating capacity
- 382 kW cooling capacity
- 459 MWh cooling energy per year
- Total heat pump capacity: 540 kW

From a structural perspective, the project prioritised material reduction and design for disassembly. The structure is robust, with separable building layers and minimized composite constructions. Recyclable materials and materials with a high recycled content were used throughout. The concrete was partially produced with recycled aggregates, reducing the demand for primary raw materials. Steel components consist to a significant extent of recycled steel.

A comprehensive circular economy strategy was already implemented during demolition: around 80% of the demolition material was reused as crushed concrete – including as fill material for earthworks and as raw material for recycled concrete. In addition, 20% of the former grandstand structure was integrated into the new building and reused.

The constructive separation of components allows for selective dismantling and high-quality material recovery. Exposed concrete surfaces avoid additional cladding and further reduce material use in the interior fit-out.