Yazar "Akyuz, Mehmet Kadri" seçeneğine göre listele

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    An analysis on energy performance indicator and GWP at Airports; a case study
    (Taylor & Francis Inc, 2021) Akyuz, Mehmet Kadri; Kafali, Hasim; Altuntas, Onder
    Airports are very important facilities for global transportation. Energy plays a key role for the comfort needs of passengers and the safe operation of aircraft. In airports with high energy consumption areas, energy management allows the reduction of both costs and environmental impacts. Therefore, the phenomena that affect energy consumption in airports need to be identified. In this study, the factors affecting energy consumption in airport terminal buildings were determined by regression analysis and mathematically modeling. In addition, energy-induced Global Warming Potential (GWP) was determined and its change was explained mathematically. It was seen that with each change in passenger causes a 1.59 kWh energy and 1.44 kg CO2 eq. change. However, each increase in the number of degree days causes a 3468.6kWh energy and 1428 kg CO2eq. increase.
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    Determination of optimum insulation thickness for building's walls with respect to different insulation materials: a case study of International Hasan Polatkan Airport terminal
    (Inderscience Enterprises Ltd, 2018) Akyuz, Mehmet Kadri; Altuntas, Onder; Sogut, Mehmet Ziya; Karakoc, Tahir Hikmet; Kurama, Semra
    The systems in which energy is most intensely used in airport terminal buildings are HVAC systems. More efficient heating and cooling systems and the performance of the building envelope can provide significant reductions in energy consumption without compromising comfort conditions in terminal buildings. In this study, the exterior walls of the International Hasan Polatkan Airport were examined using a thermal camera, and it was observed that heat losses were due to the lack of thermal insulation. The optimum insulation thicknesses for different thermal insulation materials (EPS, XPS, glass wool and stone wool) were determined by the life cycle cost (LCC) method. The effect of the application of the calculated insulation thicknesses on energy performance and the economic payback periods were determined. As a result, optimum insulation thicknesses have been found as 0.05 m, 0.033 m, 0.078 m and 0.973 m for EPS, XPS, glass wool and stone wool in respective order. It was observed from the results of analysis that the economic payback period changed between 4.85 and 7.7 years if optimum insulation thicknesses are applied.
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    Determining economic and environmental impact of insulation by thermoeconomic and life cycle assessment analysis for different climate regions of Turkey
    (Taylor & Francis Inc, 2021) Akyuz, Mehmet Kadri
    In this study, economic and environmental impact of thermal insulation have been determined for building wall in the cities of Izmir, Istanbul, Ankara, and Erzurum, located in different climates of Turkey. Three different realistic scenarios have been determined and the analysis have been carried out through these scenarios. The calculations have been made considering four different insulation materials, expanded polystyrene (EPS), glass wool (GW) rock wool (RW) and extruded polystyrene (XPS). Environmental assessments have been carried out by the life cycle assessment (LCA) method for all scenarios. Environmental analysis were carried out by combining 17 environmental effects with the ReCiPe method. The novelty of this study is the determination of environmental payback periods by combining 17 environmental effects using the ReCiPe method. As a result, economic payback times for all scenarios have the lowest value for RW. While the lowest environmental payback period was found as EPS, the highest environmental payback period was found as XPS for all scenarios. The highest economic payback time was assessed at XPS for all scenarios. The thermal insulation material with the highest economic payback period was found as XPS for all scenarios. It has been observed that thermal insulation is more effective in colder climates in terms of economic and annual avoided environmental impact. In all scenarios, environmental payback period was found to be considerably lower than economic payback period.
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    Environmental and enviroeconomic impacts of COVID-19 pandemic on commercial flights
    (Emerald Group Publishing Ltd, 2022) Akyuz, Mehmet Kadri
    Purpose The purpose of this study is to determine and compare the total and per passenger HC, CO, NOx and CO2 emissions from aircraft landing and takeoff (LTO) cycle before and during the COVID-19 pandemic. In addition, it is aimed to determine the global warming potential (GWP), environmental impacts (EIs) and enviroeconomic cost (eco-cost) of these emissions in total and per passenger. Design/methodology/approach Analyses were carried out with the help of the International Civil Aviation Organization's Engine Emission Databank, using real flight data recorded by the airport authority. Findings During the COVID-19 pandemic, total pollutant emissions (HC, CO, NOx and CO2) decreased between 23.7% and 30.8% compared with the pre-pandemic period. In addition, per passenger pollutant emissions increased during the pandemic. Compared with the pre-pandemic period, GWP, EI and eco-cost values decreased by 24.1%, 23.89% and 23.93%, respectively, in the pandemic. However, the per passenger GWP, EI and eco-cost values increased by about 10% compared with the pre-pandemic period. Practical implications This study reveals the effects of COVID-19 in terms of EIs and environmental costs caused by aircraft in the LTO cycle. Originality/value The originality of this study is to calculate the pollutant emissions caused by aircraft in the LTO cycle with real flight data and to reveal the effects of the COVID-19 pandemic. The novelty of this study is the determination and comparison of total and per passenger pollutant emissions, GWP, EI and eco-cost before and during the pandemic.
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    Global warming potential and enviroeconomic impact of commercial flights: A pre- to post-COVID-19 analysis
    (Taylor & Francis Inc, 2025) Akyuz, Mehmet Kadri
    This study explores the environmental and economic impacts of aviation emissions, focusing on the changes caused by the COVID-19 pandemic. Using real flight data from Batman Airport, the research examines aircraft emissions, global warming potential (GWP), specific environmental impacts (SEI), and specific eco-cost (SEC) from 2018 to 2023. The analysis reveals significant reductions in total emissions of greenhouse gases (CO2, HC, CO, NOx) during 2020, while per-passenger emissions increased. Compared to pre-pandemic levels, total CO2 emissions in 2020 decreased by 31.45%, while emissions per passenger rose by 9.7%. Similar patterns were observed for HC, CO, and NOx. The pandemic-induced reduction in aviation activity led to a 32.1% decrease in GWP and a 31.7% reduction in SEC for the same period. However, the rapid recovery in 2021 saw emissions and environmental costs return to near pre-pandemic levels by 2023. This research provides valuable insights into the long-term environmental effects of reduced air travel during COVID-19 and highlights strategies to mitigate aviation-related emissions, such as reducing taxi times to loer pollutants and their associated environmental costs.
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    Investigation of indoor air quality and thermal comfort condition in airport terminal buildings
    (Emerald Group Publishing Ltd, 2021) Akyuz, Mehmet Kadri; Kafali, Hasim; Altuntas, Onder
    Purpose This paper aims to measure the thermal comfort conditions and indoor air quality parameters, through on-site measurements taken in the areas mostly occupied by the passengers and airport staff. Terminal buildings consist of areas with various functions. Heating, ventilation and air conditioning requirements vary from area to area, thus leading to challenges in the management of indoor environment quality. Therefore, the study focuses on investigating the indoor environment conditions in various areas of the terminal buildings. Design/methodology/approach In this study, the thermal comfort and indoor air quality were evaluated based on the parameters [CO(2)concentration, relative humidity, temperature, predicted mean vote (PMV) and predicted percentage of dissatisfied (PPD)] collected for summer 2019 from different zones inside the International Dalaman Airport terminal building located in the southwest of Turkey. The measurements were performed in the areas mostly occupied by the airport staff and passengers (check-in area, security control areas, international departure lounge, domestic departure lounge and baggage claim hall). Findings As a result of the study, it was observed that the CO(2)concentration was 480-965 ppm, the relative humidity was 51.9-75.8% and the temperature was in the range of 23.9 degrees C-28.3 degrees C inside the airport terminal. The PMV values were determined to be in the range of -0.23 to 0.67, and the PPD values 5-15%, which are used to measure the thermal comfort conditions. Originality/value There has been limited study on the determination of the indoor air quality in airport terminals and the investigation of the thermal comfort conditions. However, in this study, indoor air quality and thermal comfort conditions were determined by on-site measurements in the five mostly occupied areas by passengers and employees in the terminal building.
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    Thermal Performance, Indoor Air Quality, and Carbon Footprint Assessment in Airport Terminal Buildings
    (Mdpi, 2024) Akyuz, Mehmet Kadri; Acikkalp, Emin; Altuntas, Onder
    This study explores energy consumption, thermal performance, and indoor environmental quality (IEQ) in terminal buildings. Through detailed thermal analysis, this research identifies key sources of heat loss, such as thermal bridges in walls and windows, which significantly increase energy demands for heating. IEQ measurements show that the lack of mechanical ventilation, combined with high passenger densities, frequently leads to CO2 levels exceeding recommended thresholds, highlighting the urgent need for improved ventilation systems. Energy requirements were calculated based on the TS 825 standard and compared to actual consumption data, showing that optimizing boiler settings could save 22% of heating energy without any additional investment. Simulations and economic analyses further showed that adding thermal insulation to the building envelope and installing double-glazed windows with improved U-values could achieve significant energy savings and reduce CO2 emissions, all with favorable payback periods. A life cycle assessment (LCA) was conducted to evaluate the environmental impact of these interventions, demonstrating significant reductions in the airport's carbon footprint. The findings underscore the importance of aligning operational standards with international guidelines, such as ASHRAE and CIBSE, to ensure thermal comfort and optimize energy use.