This master’s thesis focuses on the development and application of an assessment method for the ecological analysis and optimization of energy and building systems. The primary goal is to quantify greenhouse gas emissions across the entire lifecycle and, based on these results, enable targeted measures for municipalities. The research is conducted within the framework of the “BauKlima-Kommunal” project, using the case study of the renovation and extension of the Goetheschule in Hannover. Based on the current state of research, the following hypotheses are formulated: the level of technical systems in buildings often leads to over-dimensioning due to static systems and standards. Common ecological assessment methods for building technology provide insufficiently precise results. Furthermore, the reductions in operational emissions achieved through increased efficiency do not represent a meaningful trade-off when compared to the embodied (grey) emissions generated.
To verify these hypotheses, two approaches are taken: first, three lifecycle analysis methods are applied to cost groups 410 to 430, and their results are compared. Second, using existing documentation and dynamic simulations with the IDA ICE software, the heating, ventilation, sanitation, and cooling systems are analyzed, and planning optimizations are proposed. The insights gained are used to develop recommendations for municipal developers.
The key findings of this thesis are as follows: The assessment method based on the “Qualitätssiegel Nachhaltiges Gebäude” fails to provide sufficiently precise results when using the area-specific base value. In contrast, a detailed approach incorporating precise mass balancing and the assignment of environmental product declarations provides significantly greater insight into the actual environmental impacts of building technology. Through the dynamic simulation model, which considers climatic conditions and internal loads, a reduction in heating demand was achieved. Additionally, a detailed analysis of alternative ventilation strategies revealed that simpler building technology concepts should be prioritized from an ecological perspective.
The results underscore the potential impact of environmental lifecycle analysis for cost group 400 as a planning tool. However, the methods must be further developed and refined in the future to promote ecologically sustainable planning by all stakeholders during the early project phases.
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This master’s thesis focuses on the development and application of an assessment method for the ecological analysis and optimization of energy and building systems. The primary goal is to quantify greenhouse gas emissions across the entire lifecycle and, based on these results, enable targeted measures for municipalities. The research is conducted within the framework of the “BauKlima-Kommunal” project, using the case study of the renovation and extension of the Goetheschule in Hannover. Based o...
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