In the context of the tangible consequences of climate change, this paper develops strategies for the energy-efficient transformation of high-rise post-war buildings of the 1950s and 1960s, taking the Asemwald housing estate in Stuttgart as a case study. The objectives are full decarbonization while under occupation, while preserving the architecture of the buildings. The main aim is the significant reduction in heating energy consumption, which can in turn enable the estate to be supplied with renewable energy. Revitalizing the estate completed in 1968 preserves important architectural designs and ideas and can serve as a model for sustainable refurbishment. Thermal bridge calculations and energy simulations are carried out to identify and evaluate energy inefficiencies. Based on this, two façade renovation concepts are developed. These concepts differ in the degree of invasiveness and combine architectural sensitivity with energy optimization. In addition, an analysis is carried out to determine which alternative environmentally friendly heating systems can be used. The results show an energy saving potential of up to 60% and that a conversion to a CO2-neutral heating system is possible. It can be shown that a significant reduction in energy requirements is an important step towards converting to geothermal energy. The study emphasizes the relevance of integral and architecturally sensitive retrofitting to serve as a model for similar post-war high-rise housing estates.
Stanszus et al. (Wed,) studied this question.