Yazar "Altuntaş, Önder" için listeleme
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Airbus A-320 iklimlendirme sisteminde ekserji ve ileri ekserji analizi
Ayaz, Süleyman Kağan (Anadolu Üniversitesi, 2015)Bu tezde Airbus A-320 iklimlendirme sisteminde yer alan bir hava çevrim sistemi için 5 farklı yükseklikte enerji, ekserji ve ileri ekserji analizleri gerçekleştirilmiş ve elde edilen değerler kıyaslanmıştır. 2007 yılında ... -
Aircraft fuel system energy and exergy analysis under hot day conditions
Yilanli, Muhammet; Altuntaş, Önder; Acikkalp, Emin; Karakoç, Tahir Hikmet (Inderscience Enterprises LTD, 2018)In this paper, energy and exergy analysis of the fuel system is performed to investigate the variation of flow and heat energies of fuel. Thermal balance, formed by many different components of aircraft systems by means ... -
Assessment of a ramjet engine for different Mach numbers
Ayaz, Süleyman Kagan; Altuntaş, Önder (Inderscience Enterprises LTD, 2017)The aim of this study is to determine optimum working of a generic ramjet engine. A thermodynamic analysis has been performed to evaluate three different ramjet flight conditions that have been obtained by using GasTurb. ... -
Assessment of thermodynamic and environmental performances in subcooling process for different refrigerants
Altuntaş, Önder; Sögüt, M. Ziya; Yalçın, Enver; Karakoç, Tahir Hikmet (Inderscience Enterprises LTD, 2017)Subcooling application in cooling processes leads to increasing of cooling performance and energy efficiency within defined limits. This study examines subcooling effects of refrigerants on the coefficient of performance ... -
Assessment of thermodynamic performance and exergetic sustainability of turboprop engine using mixture of kerosene and methanol
Ekici, Selçuk; Altuntaş, Önder; Acikkalp, Emin; Sögüt, M. Ziya; Karakoç, Tahir Hikmet (Inderscience Enterprises LTD, 2016)In this study, first and second laws of thermodynamics were performed in the turboprop and is analysed and discussed with the mathematical model of sustainability performance of a turboprop engine using a mixture of ... -
Calculation of domestic flight-caused global warming potential from aircraft emissions in Turkish airports
Altuntaş, Önder (Inderscience Enterprises LTD, 2014)In this study, global warming potential (GWP) is calculated for aircrafts used in Turkish airports. The basic idea of this study is to investigate both emissions and their GWP values. This study is conducted in three steps, ... -
Calculation of HC, CO and NOx from civil aviation in Turkey in 2012
Ekici, Selçuk; Yalın, Görkem; Altuntaş, Önder; Karakoç, Tahir Hikmet (Inderscience Enterprises LTD, 2013)To meet the growing demand for air transport, airline companies doubled their aircraft numbers in Turkey, where civil aviation activities have shown great development in recent years. This increase in aircraft numbers ... -
Comparison of auxiliary power unit (APU) and ground power unit (GPU) with life cycle analysis in ground operations: A case study for domestic flight in turkey
Altuntaş, Önder; Ekici, S.; Yalın, G.; Karakoç, Tahir Hikmet (Trans Tech Publications Ltd, 2014)In this study, the Auxiliary Power Unit (APU) and the Ground Power Unit (GPU) that are required meet the energy demand in ground operations of aircraft were compared in terms of their damages -human health (disability ... -
Designation of Environmental Impacts and Damages of Turbojet Engine: A Case Study with GE-J85
Altuntaş, Önder (MDPI, 2014)Between the troposphere and stratosphere layers of the atmosphere is a critical zone for collecting emissions and negative effects on the Earth (ecological, humanity, and resources). Aircrafts are the main causes of the ... -
Determination of optimum insulation thickness for building's walls with respect to different insulation materials: a case study of International Hasan Polatkan Airport terminal
Akyüz, Mehmet Kadri; Altuntaş, Önder; Söğüt, Mehmet Ziya; Karakoç, Tahir Hikmet; Kurama, Semra (Inderscience Enterprises LTD, 2018)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 ... -
Düz Uçuş ve Tırmanmada Farklı Motor Tipleri İçin Taşıma Ekserjisi
Ekserji analizi, günümüzde hava trafiğinin artmasıyla birlikte hava araçlarından kaynaklanan küresel ısınma etkilerinin azaltılması ve enerjinin etkin kullanıma yönelik yapılan çalışmalarda büyük önem arz etmektedir. Bu ... -
Economic and Environmental Optimization of an Airport Terminal Building's Wall and Roof Insulation
Akyüz, Mehmet Kadri; Altuntaş, Önder; Söğüt, Mehmet Ziya (MDPI, 2017)HVAC systems use the largest share of energy consumption in airport terminal buildings. Thus, the efficiency of the HVAC system and the performance of the building envelope have great importance in reducing the energy used ... -
Effect of ammonia fuel fraction on the exergetic performance of a gas turbine
Ayaz, Süleyman Kagan; Altuntaş, Önder; Çalışkan, Hakan (Elsevier Science BV, 2018)Decreasing of fossil fuels and increasing global warming lead researchers to find cheap and environmentally friendly alternative energy sources. In this regard, ammonia (NH3) is a widely used feedstock. This carbon free ... -
Energy, exergy analysis, and sustainability assessment of different engine powers for helicopter engines
Yıldırım, Elif; Altuntaş, Önder; Mahir, Necati; Karakoç, Tahir Hikmet (Taylor & Francis Inc, 2017)The rapid decrease of energy resources has accelerated studies on energy efficiency. Energy efficiency refers to the effective use of energy, in other words, completing a specific task to the required standard by using ... -
Environmental impact assessment of a turboprop engine with the aid of exergy
Atılgan, Ramazan; Turan, Önder; Altuntaş, Önder; Aydın, Hakan; Synylo, Kateryna (Pergamon-Elsevier Science LTD, 2013)To develop approaches that effectively reduce engine environmental effect of aircrafts, it is necessary to understand the mechanisms that have enabled improvements in thermodynamic efficiency of aircraft engines. In the ... -
Exergetic, Exergoeconomic and Sustainability Assessments of Piston-Prop Aircraft Engines
Altuntaş, Önder; Karakoç, Tahir Hikmet; Hepbaşlı, Arif (Turkish Soc Thermal Sciences Technology, 2012)In this study, the exergetic, exergoeconomic, and sustainability aspects of piston-prop aircraft engines are comprehensively reviewed. These analysis and assessment tools are applied to a four-cylinder, spark ignition, ... -
Exergetic, exergoeconomic and sustainability assessments of piston-prop aircraft engines
Bu çalışmada, piston-prop uçak motorlarının ekserji, ekserjoekonomi ve sürdürülebilirlik yönleri kapsamlı bir şekilde gözden geçirilmiştir. Bu analiz ve değerlendirme araçları, 4-zamanlı, hava soğutmalı, 4-silindirli ve ... -
Exergoeconomic Environmental Optimization of Piston-Prop Aircraft Engines
Altuntaş, Önder; Karakoç, Tahir Hikmet; Hepbaşlı, Arif (Taylor & Francis Inc, 2015)In this study, exergy, exergoeconomic, exergoenvironmental analyses, and exergoeconomic environmental optimization are applied to a four-cylinder, spark ignition, naturally aspirated and air-cooled piston-prop aircraft ... -
Exergoenvironmental analysis of piston-prop aircrafts
Altuntaş, Önder; Karakoç, Tahir Hikmet; Hepbaşlı, Arif (Inderscience Enterprises LTD, 2012)This study deals with exergoenvironmental analysis of a four-cylinder, spark ignition, naturally aspirated and air-cooled piston-prop aircraft engine for landing takeoff (LTO) and cruise phases. This analysis includes the ... -
Exergy and energy analysis of an aircraft air cycle machine at designated altitude
Ayaz, Süleyman Kagan; Altuntaş, Önder; Açıkkalp, E.; Karakoç, Tahir Hikmet (Springer Verlag, 2018)In this paper, energy and exergy analyses are performed on an aircraft air cycle machine. Air cycle machine is essential to ventilate aircraft cabin during commercial flights. Exergy destruction rates and energy parameters ...
