Feasibility study for the renovation of a post-war high-rise building in Lancy (Geneva)

Grit Fowler Architect-Researcher

Abstract
The University of Applied Science OST and its partners of the Renowave subproject 2.3 have developed a renovation concept whereby new prefabricated façade elements are applied to the exterior of existing walls of buildings in need of refurbishment. These elements provide not only insulation but also play a role in the production and distribution of energy. The town of Lancy, a Renowave implementation partner, suggested using a 1963 high-rise building as a pilot project to test the innovative solution of the so called “Prosumer Skin active façade kits”. The present report has been redacted by HEPIA and was presented to the municipality as a feasibility study. It includes an analysis of the existing structure and technical installations of the building, an assessment of the current local and federal regulations and a recommended renovation strategy. Based on the thermal calculations (OST), the composition of the prefabricated façade elements was determined, as well as the inclusion of solar panels for electricity production. Heat pump solutions for the heating system were studied by the partners of subproject 2.3. However, the imminent arrival of the town heating led to the elimination of these solutions, resulting in the removal of the heating component from the proposed prefabricated façade element. Nevertheless, the renovation strategy has been discussed with the authorities, and the results of these consultations are listed in the report. Furthermore, the efficiency of a solar installations on the roof and the façade has been evaluated, and a cost estimate for the renovation completes the feasibility study.

Authors: Rinquet, Lionel ; Fowler, Grit.