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MUTLIFONCTIONAL PV FACADE FOR ADMINISTRATIVE BUILDINGS DEMONSTRATED AT THE NEW HEADQUARTER OF THE UTILITY OBAG

Objective

The utility OBAG plans to expand its administration building at the headquarters in Regensburg by erecting a new multi storey building of 71 meters close to the historical centre. The prestigious front side is free of shading all over the year and is appropriate to integrate an innovative and highly efficient photovoltaic facade. Aim of the project is to demonstrate the integration of a multifonctional PV facade of about 45 kWp which fulfils the following functional characteristics :
- Translucent facade construction with daylight utilisation
- Double glazed warm facade (twin facade) during wintertime
- Naturally ventilating cold facade during summertime.
It is expected that the innovative PV installation will cover up to 20% of the electricity consumption of the building, will produce about 47000 kWh electricity per year and will avoid 41.5 to CO2. The simple pay back period based on the additional costs is estimated to be 11 years in the case of later commercialisation.

The utility OBAG plans a new multi storey building for 160 employees at the headquarters in Regensburg, Germany. The overall aim of the project is to present a sustainable administration building type, which is well integrated into existing urban structures and which sets a sign for a new and sustainable architecture. The building, designed by Prof. Thomas Herzog, represents one of the outstanding possibilities to demonstrate, that PV facades on a high technical and architectural level can compete with conventional prestigious building facades from the formal as well as economical point of view and are able to contribute significantly to cover the electricity demand of administrative buildings.
Besides the innovative buildings being characterised by :
- an energy efficient architectural design by Prof. Thomas Herzog and
- highest insulation standards with a heat demand of less than 25 kWh/m²*a
The PV facade represents a newly developed multifunctional wall system, which is designed to replace conventional wall constructions. The high formal requirements of a main facade will be fulfilled by well balanced design of the PV facade inside and outside.The PV facade covers 19 floors and the electricity produced will be fed into the electricity net of the building through a floor by floor inverter concept, which minimizes DC installations and ensures best accession to the components at an optimised inverter efficiency. It is expected to produce annually about 47000 kWh electricity.
The technical innovations of the PV facade are :
- installation of a multi functional PV facade with 45 kWp
- integration of frameless, grey coloured and double glazed monocrystalline PV modules
- integration of the PV modules into a flexible warm/cold - facade. the PV modules are built as active movable louvres, which are closed during winter times representing the outside glazing of the twin facade and are tilted upwards during summer times to optimise the irradiation and to allow a backside ventilation and cooling of the modules and the stairway behind.
- utilisation of an innovative floor by floor inverter system.
- daylighting for the backside located stairway.
- integration of an energy management system
- highly qualified architectural integration
- easy access to the panels for maintenance and cleaning.
One of the major installations is the realisation of the up to now missing formal optimisation of the facade material "PV cell" without strong restrictions concerning production costs and cell efficiency.

Call for proposal

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Coordinator

OBAG AKTEINGESELLSCHAFT
EU contribution
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Address
Prüfeningerstrasse 20
93049 Regensburg
Germany

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Total cost
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