https://hdl.handle.net/20.500.12960/19 2026-04-22T10:25:09Z 2026-04-22T10:25:09Z Vatandaş, Sedat Söğüt, Mehmet Ziya Onen, Y. Emre https://hdl.handle.net/20.500.12960/1797 2025-11-19T11:16:51Z 2025-01-01T00:00:00Z

The Role of Energy Audits in Energy Management Studies Towards Decarbonisation Vatandaş, Sedat; Söğüt, Mehmet Ziya; Onen, Y. Emre Energy management constitutes a comprehensive framework meticulously crafted to oversee the judicious utilisation and management of energy resources. It encompasses a multi-faceted approach aimed at optimising energy usage, integrating renewable energy sources, and meticulously monitoring energy efficiency. As the imperative of decarbonisation gains prominence, facilities are increasingly engaged in formulating strategic imperatives to chart a course towards carbon neutrality. In this context, discussions on energy audits within facilities assume paramount significance. Through a systematic analysis of energy audit outcomes, deliberations continue regarding their implications on the overarching goal of decarbonisation. This study entails the identification of energy efficiency projects utilising the facility’s existing knowledge base and their evaluation across various parameters from the business point of view.

2025-01-01T00:00:00Z Söğüt, Mehmet Ziya https://hdl.handle.net/20.500.12960/1795 2025-11-19T11:03:37Z 2025-01-01T00:00:00Z

Environmental sustainability metrics for effective heat demand management in integrating buildings Söğüt, Mehmet Ziya For buildings with a sectoral role in decarbonisation, the main focus for energy and environmental sustainability is on-demand management and control. In this context, managing energy efficiency in systems is basically a valid approach for the development of demand management as a tool, especially for the management of green transition technologies and smart building applications. In this study, the model, which is exemplified by the analyses based on analytically derived data developed for integrated buildings with significant potential in the building sector, is examined with an entropy-based approach together with two environmental impact metrics. In particular, with the entropy-based approach, the exergy efficiency of the reference building and the resulting exergy destruction are discussed separately. The study found a thermal efficiency of 28.35% and an exergy efficiency of 25.01%. In this context, depending on the entropy production, the Environmental Potential Index (EPI) of the E1 and E2 components of the building was found to be 0.716 and 0.682 on average, respectively. On the other hand, the average sustainability index was found to be 0.399 for E1 and 0.386 for E2. According to these analyses, the average energy efficiency for E1 was 43.8%, while the average for E2 was 40.3%. In this context, the whole process shows an effective performance for the boundary conditions of the building together with possible demand management. At the end of the study, suggestions for building management were developed to improve energy and environmental sustainability.

2025-01-01T00:00:00Z Keskin, M. Hakan Koray, Murat Kaya, Ercan Fidan, Mehmet Masuk Söğüt, Mehmet Ziya https://hdl.handle.net/20.500.12960/1753 2025-04-08T07:12:02Z 2025-01-01T00:00:00Z

Additive Manufacturing for Remedying Supply Chain Disruptions and Building Resilient and Sustainable Logistics Support Systems Keskin, M. Hakan; Koray, Murat; Kaya, Ercan; Fidan, Mehmet Masuk; Söğüt, Mehmet Ziya Leading industries have implemented various strategic initiatives to enhance the resilience and sustainability of their logistics support systems in response to series of unforeseen disruptions that have significantly impacted supply chains (SCs) and incurred substantial costs over the past few decades. It is essential to assess whether incorporating additive manufacturing (AM) technologies into logistics support processes-either as a complementary solution or in conjunction with existing strategies-can effectively reduce vulnerabilities to disruptions in modern, complex SCs. AM technologies that enable the use of business models that use distributed manufacturing, as opposed to centralized manufacturing, have the potential to create significant change in traditional SCs by bringing parts and products closer to the customer. The supply of raw materials necessary for AM production is lower than that of traditional methods. While this provides a cost benefit in the current structure, there are still challenges, such as in testing and final adjustments of printing parameters. AM technologies enable shorter delivery times compared to traditional manufacturing methods while also reducing distribution costs. This not only enhances service levels, but also lowers inventory costs across all stages of the SC. Additionally, AM technologies can help businesses comply with increasingly stringent environmental regulations introduced in recent decades. Both AM-based production and the logistics processes that support it have smaller ecological footprints compared to traditional manufacturing, making it a more sustainable alternative.

2025-01-01T00:00:00Z Gergeroğlu, Hazal Knez, Mato Söğüt, Mehmet Ziya https://hdl.handle.net/20.500.12960/1752 2025-04-08T07:05:35Z 2025-01-01T00:00:00Z

Atomic Layer Deposition of Graphene-Based Nanohybrid Interlayer for Potential Improvement in Lithium-Sulfur Batteries Gergeroğlu, Hazal; Knez, Mato; Söğüt, Mehmet Ziya Lithium-sulfur batteries (LSBs) are viable options for next-generation energy storage owing to their nontoxic characteristics, elevated theoretical energy density, and abundant sulfur. However, LSBs face significant challenges, including the shuttle effect, volumetric expansion, low ionic conductivity, and anode degradation. Recent creative developments, such as improved electrolyte compositions, protective coatings, and novel interlayers, have been introduced to solve these issues. Among these, interlayers suffer from issues with lithium polysulfides (LiPSs) capturing ability, mechanical and chemical stability, ion and electrical conductivity, thickness, and weight, even though they stand out as having significant potential to improve battery performance by managing LiPSs and improving ion and electron transport. This study aims to develop an innovative interlayer for LSB systems by synthesizing and characterizing a nanohybrid combining high-surface-area, high-ion and electrically conductive, and mechanically and chemically stable three-dimensional graphene foam (3D GF) with ultra-thin Al2O3 coatings, enhancing LiPSs capture without adding significant weight or volume. Considering this goal, a matrix of nanohybrids was initially developed by synthesizing 3D GF through catalytic chemical vapor deposition (CVD). Following that, ultra-thin amorphous Al2O3 films were deposited on the 3D GF matrix using atomic layer deposition (ALD), with cycles varying from 25 to 200, to optimize the film characteristics. Comprehensive analyses using SEM (scanning electron microscopy), EDX (energy-dispersive X-ray spectroscopy), Raman spectroscopy, XRD (X-ray diffraction), and XRR (X-ray reflectivity) confirmed the successful synthesis of GF/Al2O3 nanohybrids. SEM analysis revealed that the porous network structure of the 3D GF remained intact following Al2O3 deposition, indicating minimal disruption. EDX analysis demonstrated the desired chemical composition of the thin film, while Raman spectroscopy confirmed the maintenance of structural characteristics postdeposition. XRR analysis showed consistent layer-by-layer growth of Al2O3 thin films. Moreover, heat treatment-focused XRD studies indicated that thicker ALD-based Al2O3 films facilitated alpha-phase crystallization at lower temperatures. To the best of the authors' knowledge, this study introduces the initial design for producing GF/Al2O3 nanohybrids, revealing an innovative approach towards enhancing battery performance by combining straightforward, effective, and scalable production methods and an alternative effective strategy.

2025-01-01T00:00:00Z