https://hdl.handle.net/20.500.12960/32 2026-04-21T10:20:57Z https://hdl.handle.net/20.500.12960/1819 A review on recent developments in electrospun polymeric nanofibers for oil–water separation Zembat, Ahmet Alp; Cansoy, C Elif Oil–water separation is an important process used to reduce pollution and recover valuable resources in many industrial applications. Electropun nanofibers with varying chemical composition and dimensions are commonly used to remove pollutants from water. Various nanoadditives, such as clays, metal nanoparticles, and C-based nanoparticles, can also be introduced into the polymeric nanofiber matrix to improve the removal capacity and flux of the prepared membranes. Various studies in the literature have investigated the use of these polymeric nanofibers in the separation of oil–water mixtures and oil–water emissions, and very good separation efficiencies have been supported by experimental studies. This review briefly summarises the recent developments on polymeric nanofibres used in oil–water separation. The reviewed studies showed that wettability, fiber diameter, chemical structure, and composition of the nanofibers are important parameters for the removal of contaminants, and polymeric nanofibers produced by tailoring their chemical composition and dimensions are promising candidates for many oil–water separation applications. 2026-01-01T00:00:00Z https://hdl.handle.net/20.500.12960/1809 Entropy-Driven Environmental Impact Assessment of Condensate-Induced Irreversibility in Integrated Building Energy Systems Söğüt, Mehmet Ziya; Utlu, Zafer In multifunctional and high-energy-density integrated buildings, energy performance and environmental impacts are affected by the environmental conditions in which they are located. Entropy production, which is an output of exergy analysis in energy performance, offers a new evaluation area for energy management in this context. In the study developed for this purpose, the condensate line formed in the steam distribution lines of an integrated building was modeled, and the possible inefficiency potential of the condensate load formed and the usability of the approach developed over entropy production were suggested by energy management. Entropy production due to exergy destruction of distribution lines derived from condensate pump data in the integrated building was evaluated with two environmental indices developed. According to the analysis, the average exergy efficiency for the distribution lines of the integrated building system is 22%, with exergy extinction reaching 78%, indicating a high level of return level. The recovery potential associated with the total exergy flow was calculated as 50.8%, while the entropy generation potential due to the condensation load was 65.3%. From an environmental perspective, the potential for pollution based on entropy has reached 64.9%, while the target energy efficiency level associated with condensate management has been set at 33.5%. The findings suggest that this approach for energy management offers a quantitative evaluation opportunity between thermodynamic irreversibility and environmental performance in buildings. At the end of the study, a comparative analysis of this approach with the classical regression approach for energy management is also given. 2026-01-01T00:00:00Z https://hdl.handle.net/20.500.12960/1801 Shipyard layout simulation using ARENA: a case study Tamer, Salim; Barlas, Barış; Gunbeyaz S.A.; Eren S. This study models and compares two layouts of the same shipyard system — existing and optimised — using Arena Discrete Event Simulation (Arena DES). Production data from a ship built at a private shipyard in Yalova, Turkey, were analysed to evaluate the effect of layout optimisation on production time. The existing layout has a total transfer distance of 4899 meters, while the optimised layout reduces it to 3837 metres. The results show that Transfer Time constitutes 23.89-31.74% of the Total Process Time in the existing layout and 21.20–28.92% in the optimised layout. Layout optimisation decreases Transfer Time by 12.17–15.71% and Total Process Time by 2.55–4.42%. Model validation involved comparing simulated and actual shipyard data, confirming entity counts and department utilisation. Overall, the study demonstrates that excessive material transfer can be minimised through layout optimisation, providing a validated, data-driven framework linking simulation modelling with industrial shipyard practice. 2025-01-01T00:00:00Z https://hdl.handle.net/20.500.12960/1784 Guest Editorial for Special Issue on Sustainable Energy Systems With Energy Storage Options Söğüt, Mehmet Ziya; Biçer, Yusuf As global warming intensifies, the search for sustainable energy solutions has become a critical priority in mitigating its devastating effects. Rising temperatures, extreme weather events, and environmental degradation are primarily driven by the continued reliance on fossil fuels, which release vast amounts of greenhouse gases into the atmosphere. Innovative energy solutions such as hydrogen and advanced energy storage technologies are gaining momentum to combat these threats. Hydrogen, as a clean and renewable fuel, has the potential to decarbonize multiple sectors, reducing carbon emissions and mitigating the harmful effects of climate change. Likewise, energy storage systems enable a more efficient and reliable integration of renewable energy sources, helping to stabilize the grid and reduce dependence on carbon-intensive power generation. By embracing these sustainable alternatives, we can significantly curb global warming and work towards a cleaner, greener, and more resilient energy future. 2025-01-01T00:00:00Z