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“Energy transition modules” – adding efficient living space on the top of existing buildings with pre-fabricated modules

Panel: 8. Innovations in products, systems and building technologies

This is a peer-reviewed paper.

Authors:
Julia Lempik, ifeu - Institut für Energie- und Umweltforschung, Germany
Martin Pehnt, ifeu – institute for energy and environmental research Heidelberg, Germany
Peter Mellwig, ifeu – institute for energy and environmental research, Germany
Gernot Brose, Biberach University of Applied Sciences, Germany
Roland Koenigsdorff, Biberach University of Applied Sciences, Germany
Simon Hanslmeier, Baufritz GmbH & Co. KG, Germany
Markus Lang, Baufritz GmbH & Co. KG, Germany
Hans Stotz, Beyer Weitbrecht Stotz + Partner, freie Architekten MBB, Germany
Stefanie Schweiger, Beyer Weitbrecht Stotz + Partner, freie Architekten MBB, Germany
Stephan Volkmer, Biberach University of Applied Sciences, Germany

Abstract

Especially in densely populated cities, living space is scarce and rents are increasing dramatically. But there are options to tackle this problem. Many roofs of the building stock are suitable to be topped up with living space by adding floors, thus increasing space and energy efficiency. Within a pilot project, we developed innovative modules that can be used for this purpose.

We call these modules “energy transition modules”. They are highly energy-efficient, use wood as their primary building material while having a supply unit using solely renewable energy. This unit supplies heat to the surrounding rooms centrally via wall heating, concentrates technology in one module part, thus allowing favourable transportation from the manufacturing to the building site, and enabling a flexible floor plan arrangement. In order to check which system technology should be used to supply heat and domestic hot water to the modules, energy analysis, life cycle assessments, and cost calculations were carried out to obtain an optimal result.

Different variants of energy transition modules were developed in order to prepare for various applications and circumstances, including adding a floor to car parks, office buildings or other non-heated buildings. The energy transition module can either supply a building with heat and energy (self-sufficient), share only a part of its energy with the building (symbiont), or be supplied by the building (profiteer). By arranging different modules, a “village on the roof” can be created.

The project, which is presented in this paper, is unique in several ways: We planned and simulated the heating system and developed concepts for an architectural implementation. We analysed the changes in legislation required to increase the number of rooftop designs. In addition, we determined how many energy transition modules can be used for rooftop designs in Germany, and finally realised the module on top of an office building in Southern Germany.

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