Project descriptionWith its main building and sports hall from the Weimar period, the school provides an important example of a regional school building from this period and is classified as a cultural monument according to the monument conservation act of Saxony. In recent years it has housed a secondary school. Görlitz district, which is the local school authority, is now looking to move the special school located in Zittau to Olbersdorf.
The Olbersdorf school building is a four-storey masonry structure with a gable roof. The main entrance from the street is on the ground floor. Because the building is constructed on a slope, the rear entrance from the schoolyard leads into the first floor. Large parts of the building are constructed with a solid masonry structure that has a depth of 48 cm and achieves a U-value of around 1.25 W/m²K. In order to encourage a “learning atmosphere”, the refurbishment measures also intend to improve the acoustics and air hygiene, while lowering the indoor temperatures in summer.In terms of the building fabric, the focus is on improving the thermal insulation of the building envelope in accordance with listed building requirements. Double windows were originally installed in the building. During the course of earlier refurbishment measures, the outer panes on the street side were replaced with double-glazed insulating glass and the inner panes of the double windows were removed. The original windows still remain on the courtyard side.
The refurbishment is intended to reduce the heating requirement by more than 80%. In addition to the structural improvements, these savings will be principally achieved by deploying modern heating technology and efficient ventilation strategies, whereby low-maintenance technology shall be used that is appropriate for everyday use in schools.Before the refurbishment, the heat was provided with a gas boiler. Ventilation was provided via the windows and exhaust air ducts integrated into the masonry structure, which are typical for the type of construction used when the building was built. These exhaust air ducts were only full functioning in the entrance areas and partly in the toilets, whereas in the classrooms they had been mostly blocked off during previous renovation work. Daylight is provided in the teaching spaces by means of windows along one side of the classrooms, on either the west or east sides. Because of the building’s position on a slope, the corridor spaces, entrance area and assembly hall receive too little daylight and require artificial lighting throughout the day.
Construction costs and economic viability
The overall investment costs amount to 8.8 million euros. The project is being sponsored by the German Federal Ministry of Economics and Technology as part of its “Energy-Optimised Construction, EnEff:Schools” subsidy programme.
Educational conceptOnce the refurbishment work has been completed, it is planned to provide a display that will illustrate the energy efficiency of the school building to the school pupils, teachers and parents.
Energy dataEnergy indices according to German regulation EnEV:
Research/Evaluation: Hochschule Zittau/Görlitz, Fakultät BauwesenArchitect: AIZ Zittau Architektur- und Ingenieurbüro für Hoch- und Tiefbau Zittau GmbH
Facade insulation, optimisation of supply air double windows: Materialforschungs- und Prüfanstalt Weimar an der Bauhaus-Universität Weimar
Heat concept, system simulation: ITG Dresden
Double windows: PaX Classic GmbH
Ventilation: PASStec GmbH
Subsidy: The project is being sponsored by the German Federal Ministry of Economics and Technology as part of its “Energy-Optimised Construction, EnEff:Schools” programme.
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