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Faculty of Technical Sciences building of Innsbruck University

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This building, used by the Faculty of Technical Sciences of the University of Innsbruck, was originally built in 1968. As an extensive renovation was necessary anyway, it was decided to improve the energy efficiency at the same time, with moderate additional expenditure. In close cooperation with the Passive House Institute, the planners developed an overall concept, which turned the eight-storey building into an exemplary project – it is currently the world’s largest building to be certified to the EnerPHit Standard.

The reinforced concrete structure consisting of ceilings and supports was retained, but the building envelope and building services were completely overhauled. In addition to a great increase in energy efficiency, this also led to substantially improved occupant comfort. Among other things, this was due to automatically controlled passive cooling at night via windows in summer, the supply of fresh air directly into the office areas through adequately dimensioned transferred air openings, and a good level of thermal protection of the façade. The efficiency of electrical equipment was also increased.

Through integrated planning, the heating demand of the building was reduced from 180 kWh/m²a to just 21 kWh/m²a. The project thus meets the criteria of the EnerPHit Standard for retrofits with Passive House components. The public will have the opportunity to visit the building during the International Passive House Days from 13 to 15 November 2015.

 

Building information

Building type: school | campus | university

Location: A - 6020 Innsbruck (Tirol), Austria

Number of appartments / units: 720

Treated Floor Area according to PHPP: 8897m²

Construction type: mixed construction (timber and masonry)

Year of construction: 2014

 

Parties involved

Architecture: Generalplaner ATP Architekten

Building services: Generalplaner ATP Architekten

Building physics: Passivhaus Institut - Standort Innsbruck & TB Rotbacher (Schall)

Statics: General planner ATP Architekten

 

Mechanical systems

Ventilation: central ventilation system, 2 air handling units

- Central ventilation system in the existing utility room on roof

- 2 ventilation units

- Total current = max. 16380m³/h

- Air exchange rate = 0.58 1/h (very dense coverage)

- Heat availability level device > 75%

 

Domestic hot water

The low hot water demand is covered with floor-mounted boilers

 

PHPP values

Air tightness: n50 = 1/h

Annual heating demand: 20kWh /(m²a) calculated according to PHPP

Heating load: 24W/m²

Primary energy requirement: 190 kWh /(m²a) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP.

 

 

For further information, please visit the relevant Passive House Institute website

Lessons learnt

This completely modernised university building demonstrates the energy saving potential available with refurbishments. As an extensive renovation of the building was necessary, since it was built in 1968, it was decided to improve the energy efficiency at the same time, with moderate additional expenditure. The planners, in close cooperation with the Passive House Institute, developed an overall concept which turned the eight-storey building into an exemplary project – it is currently the world’s largest building to be certified to the EnerPHit Standard.

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