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    An Assessment of the Energy Performance and Initial Investment Cost of SDHW Systems: A Case Study of University Dormitory in Northern Cyprus
    (Mdpi, 2025) Akguc, Alpay; Yasar, Dilek
    This simulation-based theoretical study addresses a critical gap by jointly assessing the technical performance and long-term economic sustainability of Solar Domestic Hot Water (SDHW) systems in economically volatile, import-dependent regions. Focusing on a fully operational system in a 700-bed dormitory at Middle East Technical University, Northern Cyprus Campus, TRNSYS 17 simulations were combined with a 15-year (2010-2024) cost trend analysis considering currency depreciation and construction price escalation. Results demonstrate that collector fluid temperatures exceeded 80 degrees C from April to October, maintaining domestic hot water above 60 degrees C for over seven months annually and reducing auxiliary heating demand by approximately 50%, translating into substantial annual energy savings. Economically, system component costs rose by 26-75 times, with circulation pumps showing the steepest increase (75x), highlighting vulnerabilities in import-dependent supply chains. Despite these cost escalations, the region's high solar irradiation enables a competitive long-term investment profile, with potential payback periods remaining attractive under supportive policy frameworks. The originality of this work lies in its dual-focus methodology integrating performance modeling with economic resilience analysis, providing actionable insights for policymakers, designers, and investors in Mediterranean and similar climates seeking to balance renewable energy adoption with financial viability.
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    Optimizing Window Thermophysical Properties for Reducing Energy Demands, Energy Costs, and Greenhouse Gas Emissions in Residential Buildings of Türkiye
    (Turkish Soc Thermal Sciences Technology, 2025) Guven, Mustafa; Akguc, Alpay
    This study aimed to reevaluate the reference thermophysical property of windows (U-value) prescribed by the TS825 Thermal Insulation Requirements in Buildings standard based on three separate thermophysical categories (U-value, SHGC, and T-vis) with an aim to suggest an optimum window option to improve the sustainability of residential buildings in T & uuml;rkiye align with the Goals 11, 12, and 13 of 2030 Sustainable Development Goals (SDGs). Accordingly, the energy performance of reference window type indicated by TS825 standard was tested for a sample residential building in Istanbul, using the DesignBuilder building energy simulation tool. Afterwards, in alignment with Goal 11, various new window types were proposed, and their impact on the annual energy demand of a sample building was analyzed. In the second phase, the effects of these window systems on energy costs were investigated vis-a-vis Goal 12. Finally, in the third phase, their impact on greenhouse gas emissions was assessed with a view to Goal 13. This study's hypothesis that the constant U-value approach in the TS825 standard does not adequately meet energy efficiency requirements across climatic conditions can significantly contribute to sustainable buildings. It provides outcomes to help policymakers optimize energy use and update standards toward T & uuml;rkiye's 2030 SDGs.