KfW Efficiency House

The three TCK1 administration buildings of Knorr-Bremse in Munich experienced overheating problems in the summer. With the help of new triple insulating glazing with a 60/27 solar control coating in combination with external solar shading, the intention was to reduce the solar energy input. However, the supporting structure and facade were not designed for the weight of additional sun protection.

From Solar Shading with Minimal Rear Anchoring…

In order to keep the facade penetrations as low as possible, a steel construction for the new sun protection was placed in front of the existing facade. Back anchoring to the building itself was only carried out for horizontal loads. The textile sun protection can be adapted to the prevailing weather conditions (solar radiation, wind, rain) via a central control system. Different variants and the improvements that can be achieved with them were examined and evaluated in advance by means of thermal-dynamic simulations.

…to Comprehensive Transformation of the Existing Building

During the planning phase, the client decided to have further measures carried out in addition to the facade renovation in order to raise the existing buildings to the level of a KfW Efficiency House 70. For this purpose, a flat roof renovation, photovoltaic roof systems including lightning protection, a combined heat and power unit to co-supply a neighbouring canteen building, a reversible groundwater heat pump including an associated well system as well as the electrical integration of the generators were planned and implemented.

The reduction in emissions since the transformation of the existing building is considerable!

Architecture
Henn, Munich/Germany

Planning time
2016 − 2019

Construction time
2018 − 2019

Services by Werner Sobek
Facade engineering, structural analysis, glass construction;
Provision of documentation in accordance with the Energy Saving Ordinance (EnEV) regarding the alteration of existing buildings;
Summer thermal insulation, sound insulation;
Dynamic thermal building simulation;
Daylight simulation;
Measuring and control technology for solar shading system;
Variant calculations in accordance with DIN V 18599 for the attainment of the KfW Efficiency House standard in the existing buildings and subsequent support and documentation for the measures required to achieve the KfW 70 level;
Planning for power installations and photovoltaic systems, lightning protection, the cogeneration unit, the reversible groundwater heat pump and the associated well installation

GFA
approx. 17,500 sqm

Client
Knorr-Bremse SfS GmbH, Munich/Germany

Photography
Knorr-Bremse AG, Munich/Germany

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