http://hdl.handle.net/11508/11915 2026-04-28T15:43:25Z 2026-04-28T15:43:25Z Mersin, Denizhan Tayfur, Gökmen Vaheddoost, Babak Safari, Mir Jafar Sadegh http://hdl.handle.net/11508/21036 2023-03-09T00:03:43Z 2022-10-15T00:00:00Z

Historical trends associated with annual temperature and precipitation in Aegean Turkey, where are we heading? Mersin, Denizhan; Tayfur, Gökmen; Vaheddoost, Babak; Safari, Mir Jafar Sadegh The trend analysis of annual temperature (daily average) and total precipitation has been conducted for 14 stations located in the Aegean Region, Turkey. The Sen, Spearman's rho, and Mann-Kendall test methods are used in the detection of the historical trends in the region. The Pettitt test is also implemented to find the significance of the trend, while the Theil-Sen approach is applied to detect the change point(s) in the time series. Findings of the following study indicate that both precipitation and temperature time series in the selected stations depict statistically significant trends with increasing nature. The rate of increase in precipitation and temperature by the Theil-Sen test is found to be 4.2-7.9 mm/year and 0.20-0.35 °C/decade, respectively. It is also found that the turn points of the temperature trends determined by the Pettitt test occurred in 1998 for all the stations. According to the results, the magnitude of the extreme events would change in the future, which may help in conceptualizing the framework and the resilience of the infrastructures against climate change.

2022-10-15T00:00:00Z Tutumlu, Hakan Duman, Erkan Inalli, Mustafa http://hdl.handle.net/11508/21022 2022-09-10T00:05:35Z 2022-06-28T00:00:00Z

An estimation of the performance of a passive cooling system incorporating a ground heat exchanger using a multilayer artificial neural network Tutumlu, Hakan; Duman, Erkan; Inalli, Mustafa Abstract Objective: This paper examines the cooling of an office building without a heat pump, using only ground heat exchangers (GHE) and implementing artificial neural network (ANN) to train it on experimental data. Methods: The office building is situated at 38° 40′ 57′′ N latitude and 39° 10′ 29′′ E longitude in the province of Elazig. Each minute, the installed system was monitoring the office’s external meteorological data, the office’s indoor meteorological data, the GHE inlet and outlet temperatures, and the amount of heat load developed during the cooling process. In this study, the passive cooling system’s cooling load and coefficient of performance (COP) were experimentally examined. A second important contribution of this paper is the multilayer ANN model that was created using data selected from the experimental setup, which was measured and recorded. Results: During the summer months of 2018, the COP of the system was measured to be 1.67 on average. The accuracy rates of the multilayer ANN model proposed for cooling systems were calculated to be over 99% and 95% in the training and test datasets, respectively. It was observed that the performance value estimated by ANN converges to the true value by 99%. Conclusion: Having performed this study, it has been demonstrated that passive cooling can be achieved with GHE, and by conducting this study without utilizing a heat pump system, we intend to contribute significantly to the relevant scientific literature.

2022-06-28T00:00:00Z Mersin, Denizhan Gülmez, Ayşe Safari, Mir Jafar Sadegh Vaheddoost, Babak Tayfur, Gökmen http://hdl.handle.net/11508/21021 2022-09-10T00:05:28Z 2022-07-12T00:00:00Z

Drought assessment in the Aegean Region of Turkey Mersin, Denizhan; Gülmez, Ayşe; Safari, Mir Jafar Sadegh; Vaheddoost, Babak; Tayfur, Gökmen Drought indices are commonly used to monitor the duration and severity of droughts. In this regard, the continuously changing climate regardless of its cause or effect pushes the limit of the water deficit through time and space. Izmir is a raising city in Turkey, which owns various water resources including but not limited to seashores, lakes, river streams, and groundwater aquifers. In this study, the long-term precipitation and temperature records from 14 meteorological stations between 1973 and 2020 (for 47 years) are used to investigate the drought characteristics in Buyuk Menderes, Kucuk Menderes, and Gediz basins located in the Aegean region of Turkey. For this, the Standardized Precipitation Index (SPI) and the Standardized Precipitation Evapotranspiration Index (SPEI), Percent of Normal (PNI), and the so-called Discrepancy Precipitation Index (DPI) are used with consideration to 1-, 3-, 6-, and 12-month moving averages to investigate the drought patterns. Results showed that the monthly indices depict very similar results for the entire region. However, in the 1980s and 2010s droughts were more severe than the rest of the historical records. When the moving average operator is implemented in the analysis (3-, 6- and 12-month periods), neither SPI nor the SPEI showed the same results at any stations. It is illustrated that the periods of severe and normal drought have occurred in the past, yet the indices that are obtained using average values are generally within the normal limits, but extreme values (extremely arid or extremely wet) occurred occasionally. It is also concluded that although there is a similarity between the implemented indices, the DPI and PNI depict the highest resemblance.

2022-07-12T00:00:00Z Tutumlu, Hakan Aydoğdu, Berkay İnallı, Mustafa http://hdl.handle.net/11508/21018 2022-06-10T00:04:14Z 2022-06-07T00:00:00Z

Energy performance analysis of buildings in terms of alternative reinforced concrete structural systems Tutumlu, Hakan; Aydoğdu, Berkay; İnallı, Mustafa In this study, the thermal energy performances and environmental effects of two different reinforced concrete structures, Pure Shear Wall (PSW) Building and Shear Wall-Frame (SWF) Building, were investigated in the climatic conditions of Elazig province. Thermal performance analysis for both buildings; was carried out with the TS 825 program. First of all, through this program, monthly and annual heating loads were determined for 11 different alternative building component scenarios of two different buildings. Subsequently, efficiency alternatives were created in accordance with the climatic conditions of the region and TS 825. Efficiency alternatives designed for both buildings have been analyzed together with their completely uninsulated and current states. Finally, buildings with reinforced concrete carrier systems, energy analysis methods and efficiency alternatives were compared and evaluated based on the results of the analysis. As a result, it has been observed that the building with the PSW system consumes more energy than the building with the SWF system when it is uninsulated and in its current condition.

2022-06-07T00:00:00Z