Akademik Veri Yönetim Sistemi
Tezin Türü: Doktora
Tezin Yürütüldüğü Kurum: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Mimarlık, Türkiye
Tezin Onay Tarihi: 2025
Tezin Dili: Türkçe
Öğrenci: AYŞENUR COŞKUN
Asıl Danışman (Eş Danışmanlı Tezler İçin): Semra Arslan Selçuk
Eş Danışman: Fatma Zehra Çakıcı
Özet:
The effects of climate change and global warming have placed the construction sector at the center of transformation in terms of energy efficiency and carbon emissions. Buildings are responsible for approximately 40% of total energy consumption and 36% of carbon emissions, and the energy performance of the existing building stock is quite low. Therefore, improving existing structures instead of constructing new buildings offers a more economical, environmentally friendly and applicable solution. In this context, the “Energy Efficient Retrofit” approach reduces energy consumption and environmental impacts through interventions in the building envelope and energy systems, while also providing economic benefits. In this study, the energy, economic and environmental performances of the improvement alternatives for the building envelope and energy systems of an existing residential building were evaluated together. Taguchi design of experiments, building energy simulation (DesignBuilder-EnergyPlus), regression modeling and multi-criteria decision making (MOORA) methods were used in an integrated manner. In line with the scenarios consisting of 7 factors and different factor levels, 648 combinations were modeled and multidimensional outputs such as total energy consumption, heating energy consumption, energy saving, carbon emission, payback period, annual return, benefit/cost ratio were analyzed for each. In this context, energy, environmental, and economic indicators were optimized together under different weightings, and the most suitable scenarios were determined. According to the quantitative findings, compared to the current situation, total annual energy consumption decreased by 49.1% in the energy/environment-focused scenarios, from 152,228 kWh to 77,445 kWh. Similarly, annual CO₂ emissions decreased from 44.3 tonnes to 16.4 tonnes, a decrease of approximately 63%. In these scenarios, the payback period was 8.5 years, the benefit/cost ratio was 2.24, and the annual average return on investment was 11.2%. In the economic-focused scenario, energy consumption was 79,653 kWh, CO₂ emissions were 16.9 tons, the payback period was 7.8 years, the benefit/cost ratio was 2.32, and the annual return on investment was 11.6%. The resulting evaluations demonstrate that the developed integrated method can reliably analyze a large number of scenarios with a limited number of simulations and offers flexible solutions based on different priorities. The study presents an interdisciplinary, systematic, and applicable decision support model for energy-efficient building retrofits, offering robust results in terms of energy efficiency, environmental sustainability, and economic viability.