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Öğe A case study on the modeling and simulation of UAVs(Yildiz Technical University, 2024) Koç, Osman Kerem; Sertkaya, Ali; Gönül, Alişan; Taner, Tolga; Dalkılıç, Ahmet SelimThe flow and structure of an application design for un-manned aerial vehicles (UAVs) are examined in this research. We also show an example of modeling and simulation study with the ANSYS Fluent and Mechanical programs. This research reveals the unmanned aerial vehicle's structural and mechanical design, structure configurations, energy-flow and struc-tural analysis, propulsion and firing systems, prototype production and testing, and design flow models. This study aims to complete the unmanned aerial vehicle design by determining its aerodynamic configurations. Due to the complexity of the design, a preliminary preparation for flow analysis is performed with simplified geometry as well as flow analysis. The unmanned aerial vehicle is tested at different velocities by numerical analysis. In addition, different density flow analyses provide predictions about the aerodynamic forces of the UAVs at different heights and temperatures. The thrust results are 4240 g, power became 1711.62 W with 2.48 g/W efficiency, and 12179 [rpm] revolution for 22.2 V voltage and 77.1 A current, respectively. The 5 different analyses are performed in the range of 2.9-12 million elements, and the solution meshes with the lowest number of elements by performing parametric studies with the ANSYS program that gives the most accurate resultÖğe A case study on the modeling and simulation of UAVs(Yıldız Teknik Üniversitesi, 2024) Koç, Osman Kerem; Sertkaya, Ali; Gönül, Alişan; Taner, Tolga; Dalkılıç, Ahmet SelimThe flow and structure of an application design for un-manned aerial vehicles (UAVs) are examined in this research. We also show an example of modeling and simulation study with the ANSYS Fluent and Mechanical programs. This research reveals the unmanned aerial vehicle’s structural and mechanical design, structure configurations, energy-flow and struc-tural analysis, propulsion and firing systems, prototype production and testing, and design flow models. This study aims to complete the unmanned aerial vehicle design by determining its aerodynamic configurations. Due to the complexity of the design, a preliminary prepa- ration for flow analysis is performed with simplified geometry as well as flow analysis. The unmanned aerial vehicle is tested at different velocities by numerical analysis. In addition, different density flow analyses provide predictions about the aerodynamic forces of the UAVs at different heights and temperatures. The thrust results are 4240 g, power became 1711.62 W with 2.48 g/W efficiency, and 12179 [rpm] revolution for 22.2 V voltage and 77.1 A current, respectively. The 5 different analyses are performed in the range of 2.9-12 million elements, and the solution meshes with the lowest number of elements by performing parametric stud- ies with the ANSYS program that gives the most accurate result.Öğe A flow channel with nafion membrane material design of pem fuel cell(Yildiz Technical University, 2019) Taner, TolgaThis study is about flow channels in the design of the PEM (Proton Exchange Membrane) fuel cell system. In the experimental study, different flow geometry, Nafion membrane, and bipolar plate gas diffusion channel designs are available. In some cases, the techno-economic analysis method is applied. Cost analysis for the design has also been made and compared with similar studies. It was obtained that the new flow channel design increased the PEM fuel cell performance. A unit energy cost was set to 42.6 [$/W]. When a similar system was implemented for a year, the annual energy cost was calculated to be 25.48 [$/y]. The aim of this study is to determine the cost-benefit analysis of PEM fuel cell with a combined flow channel design. In addition, the simple payback period was found to be 0.81 [y]. Thus, the PEM fuel cell was determined by the techno-economic analysis calculation, in which energy savings can be achieved by the flow channel design.Öğe A lime production of the fluidized bed boiler's energy and exergy analyse(Yildiz Technical University, 2017) Taner, Tolga; Sivrio?lu, MecitIn this study, it was calculated energy and exergy analysis of a lime production for the fluidized bed boiler by a case of sugar factory. The aim of this study is to show calculation of the energy and exergy analysis of a lime production for the fluidized bed boiler, and to determine a lime mass quantity for the factory process. This factory is a sugar factory that has got many heat processes for the sugar raw filtration and defection. The production of lime mass was found 1.2973 [kg/s]. The production of lime (CaO) energy result was found 4121.92 [kW] and exergy result was found 2766.97 [kW]. Energy (CaO) quality was found 0.671.Öğe A model of energy management analysis, case study of a sugar factory in Turkey(Indian Academy Sciences, 2018) Taner, Tolga; Sivrioğlu, Mecit; Topal, Hüseyin; Dalkılıç, Ahmet Selim; Wongwises, SomchaiThis study presents a case study of energy management in a sugar factory in Turkey. The main idea of the study is to analyse energy consumption, the quantity of material production, and figure out a suitable energy efficiency for the case study of a sugar factory subsequently. Firstly, a material production and energy consumption audit were performed for the sugar factory. Secondly, energy efficiency was calculated from the energy data. The SPSS (Statistical Package for the Social Sciences) statistical software was used to ensure the accuracy of the data. The factory's energy consumption was calculated as 43,590.25 toe (tons of oil equivalent) over the last year. These results were used for CUSUM (Cumulative Sum Deviation Method) graphics. This research poses the consumption of energy, cost of energy and the relationship between energy usage and material production of sugar. The unit of energy cost was 688.22 [$/toe] for the last year. This result showed that the factory decreased the unit of energy by optimisation. The results indicated that the investigated sugar factory should pay attention to the energy management issue in order to comply with the Energy Efficiency of Turkish Law and Directives.Öğe A review of flow boiling in mini and microchannel for enhanced geometries(Yildiz Technical University, 2018) Çebi, Alican; Çelen, Ali; Dönmez, Aydın Hacı; Karakoyun, Yakup; Celen, Pınar; Cellek, Mehmet Salih; Dalkılıç, Ahmet Selim; Taner, Tolga; Wongwises, SomchaiFlow boiling researches in enhanced geometries practiced recently have been summarized in this review. Classical approximations in macroscale flows have not applied to the flows with small hydraulic diameters, so, this subject has been paid attention by the researchers. Application areas of these structures are increasing continuously due to cooling need in small confined spaces. The related studies have been reviewed in a chronological manner and their parameters have been given in a table in order for the researchers to observe the scientific duration regarding the progresses on this subject. Almost all papers on this subject have been produced after 2000, therefore, this subject is considered as an actual one to improve and worth to study in the literature. This study can not only be evaluated as the beginning argument for the researchers involved in flow boiling process in mini and microchannel, but it also consists of new works on the investigated subject.Öğe A techno-economic & cost analysis of a turbine power plant: A case study for sugar plant(Pergamon-Elsevier Science, 2017) Taner, Tolga; Sivrioğlu, MecitA general model (sugar production processes) was developed based on data provided by a real plant and provided an exergy analysis. It was explored for a techno-economical turbine power plant and the improvement of performance indicators was achieved through thermoeconomic analysis. Unit cost for the turbine power plant is found to be 3.142 [$ / kW]. The simple payback period of the turbine power plant is calculated as 4.32 years. The purpose of this study is to reduce the cost of power plant. At the same time, this study poses a thermoeconomic analysis to increase turbine power.Öğe Application of artificial intelligence techniques for heat exchanger predictions in food industry(Elsevier, 2024) Öztuna Taner, Öznur; Mercan, Hatice; Çolak, Andaç Batur; Radulovic, Jovana; Taner, Tolga; Dalkılıç, Ahmet SelimHeat exchangers (HEXs) are deployed in diverse engineering applications, such as cooling and refrigeration systems; power plants; and automotive, chemical, textile, and food industries. Understanding the principles and fluid-to-fluid heat exchange geometry can be complex. Researchers usually apply the first and second laws of thermodynamics to conduct numerical, analytical, and experimental techniques on HEXs. Experimental approaches tend to be costlier due to setup expenses, while theoretical and numerical analyses rely heavily on assumptions and complex equations. To address these challenges, artificial intelligence (AI) models have emerged as a promising solution for modeling, optimization, and performance estimation of thermal systems employing HEXs. In the last 30 years, AI-based approaches have gained widespread adoption in thermal analysis of HEXs, building upon past research. Three main types of thermal analysis have been reported: single-phase flow, two-phase flow, and machine learning-based physical property evaluation. AI approaches have proven effective in estimating crucial HEX parameters like pressure drop (?P), heat transfer coefficient (h), friction factor (f), and Nusselt number (Nu). They have also demonstrated success in assessing phase change characteristics during fluid boiling and condensation processes, as well as identifying two-phase flows. Despite these advancements, it is emphasized that more work remains to fully harness AI’s potential for thermal analysis of HEXs. As AI gains traction, it presents itself as a valuable technology for enhancing the study of HEXs with satisfactory results.Öğe Application of trigeneration with direct co-combustion of poultry waste and coal a case study in the poultry industry from Turkey(Vinca Inst Nuclear Sci, 2018) Topal, Hüseyin; Taner, Tolga; Altınsoy, Yelda; Amirabedin, EhsanThis study implies the significance of a trigeneration (TG) system, which converts a single fuel source into three useful energy products (i. e. power; heating, and cooling), and focuses on the simulation of a TG system with direct co-combustion of poultry wastes. The methodology is applied to a case study in northwest of Turkey to investigate how local poultry manure and environmental conditions can be effective in the production of energy. In addition, thermodynamic assessment of the system is performed, and the performance of the TG system is assessed by using energy, exergy, and parametric analysis methods. Poultry litter to coal ratio was 50% at the beginning, then poultry litter ratio in the mixture was increased to 90%, and this has led to less CO2 emissions from the TG and combined heat and power systems co-firing with poultry litter. With rice husk however the consumptions of TG and combined heat and power increased from 6533-6624 tonne per year, and 6549-6640 tonne per year, respectively. As a result, co-combustion of poultry waste can be considered as the best environmentally-friendly remedy to dispose chicken farm wastes, while catering the energy demand of the facility.Öğe Buharlaşma prosesi eşanjör ısı transferi analizi: Şeker fabrikası örneği(Teknolojik Araştırmalar, 2015) Taner, Tolga; Sivrioğlu, MecitBu çalışmada, dünyanın en önemli şeker entegre tesislerinden biri olan Çumra Entegre Tesisinin ham şerbet buharlaşma prosesi ısı transferi hesaplamaları yapıldı. Bu çalışmanın amacı, ham şerbet üretiminde buharlaştırıcı olarak kullanılan eşanjörlerin (ısı değiştirgeçleri) kütle denkliği ve enerji hesaplamaları ile buharlaştırıcı proses sıcaklık giriş ve çıkışları fabrika proses enerji analizi hesaplamalarında kullanabileceğini göstermektir. Bu enerji hesaplamalarında kullanılan bazı parametrik veriler fabrikanın otomasyon kumanda merkezinden alınmış ve bazı kabuller yapılmıştır. Bu hesaplamalara göre şeker üretimindeki buhar ihtiyacı ve özellikleri hesaplanmıştır. Evaporatörlerdeki buharlaştırıcı sıcaklık farkının 5.0 ile 8.7 [°C] arasında değiştiği hesaplanmıştır. Ayrıca basıncın ise 0.17 ile 0.87 [bar] aralığında olduğu bulunmuştur. Hesaplamalar sonucunda, ham şerbet üretiminde kullanılan eşanjör (ısı değiştirgeci) enerji miktarının 2723.00 [kJ/pg] ve kireçli ham şerbet üretiminde kullanılan eşanjör enerji miktarının ise 11453.75 [kJ/pg] bulunmuştur. Bu çalışmada, kireçli ham şerbet üretiminde kullanılan eşanjörden elde edilen enerjinin daha fazla olduğu sonucuna ulaşılmıştır.Öğe CFD analyses on the thermal comfort conditions of a cooled room: A case study(Springer, 2022) Özsağıroğlu, Semih; Camcı, Muhammet; Taner, Tolga; Açıkgöz, Özgen; Dalkılıç, Ahmet Selim; Wongwises, SomchaiThis study examined a room with a surface of 1.8 x 1.8 x 2.85 (m) and a well-insulated floor (adiabatic condition) and examined the heat exchange from the side surfaces and ceiling. In this closed room, the heat transfer effects with radiation were investigated while bringing them to comfort conditions ranging from 30 (degrees C) air temperature to 20-24 (degrees C). A computer with a power of 25 (W) as a source of heat, a person with an average metabolic activity of 50-70 (W) and a table were found in this closed room. In this study, the cooling of the room from the floor, ceiling and air conditioner was inquired while the computer was running, in a closed area under the specified heat transfer conditions. As a scenario, the air exchange coefficient was modeled via Ansys Fluent, fed with air of 15 (degrees C) with 1, 3, 5, 10, 15 air. In addition, the comfort values of the human wrist (the distance of 0.1 m) and the shoulder (the distance of 1.1 m) were researched according to ASHRAE-55. The obtained results were analyzed as a comparison of ACH results, and the comfort parameter values were analyzed by reading the sections taken from the ankle shoulder level and velocity, temperature, values according to ANSI/ASHRAE-55. The relative humidity was 50% in the room, while the metabolic activity is 1.2 (met). These parameters corresponded to the sitting position; the clothing effect was found to be 0.67 (clo). The novelty of this study encourages the production of the ideal CFD analysis on the thermal comfort conditions of a cooled room, the task of engineering.Öğe Data on energy, exergy analysis and optimisation for a sugar factory(Elsevier, 2015) Taner, Tolga; Sivrioğlu, MecitA huge amount of energy is consumed during sugar production in the food industry. The large amount of steam used and the power of the turbine power plant are key factors. This makes energy and exergy analysis important in sugar factories. The data given in the following paper are related to input and output information of the paper entitled Energy-exergy analysis and optimisation of a model sugar factory in Turkey by Taner and Sivrioglu (2015)111. Factory total energy efficiency and exergy efficiency are found to be rier,T= 722% and riexT=37.4%, respectively, and according to these results, the total energy quality 0T=0.64. These results indicate higher efficiency than similar studies (Vuckovic et al., 2014; Pellegrini and Oliviera Junior, 2011; Deshmukh et al., 2013; Palacios-Bereche et al., 2015) [2-51. This study can be a model for these similar factories by Taner and Sivrioglu (2015) [1]. (C) 2015 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/40).Öğe Economic analysis of a wind power plant: A case study for the Cappadocia region(Korean Soc Mechanıcal Engİneers, 2018) Taner, TolgaThe scenario analysis was conducted for a wind power plant in the Cappadocia region, which was selected due to its importance as a historical region and high wind potential. This study determined that the construction of wind power plant can be suitable for the Cappadocia region by using the escalation method of inflation. This study aims to determine the feasible investment cost for wind power plant construction with a suitable economic method. This case study predicted that a 3 MW wind energy plant would be constructed, and an energy production of 7884000 kWh/y can be economical for the Cappadocia region of Turkey. Total investment cost of the wind power plant was estimated to be $ 13540800, and unit electricity cost was approximately 0.14689 $/kWh. The construction of the wind energy plant was evaluated by escalation method for three successive years (2014, 2015 and 2016). Results show that a wind energy plant is economical for the Cappadocia region (Turkey) due to its high-energy wind potential (Wind data acquisition station of Derinkuyu, Cappadocia region). The Government of Turkey, which supports the entrepreneur, imposes no taxes for wind power plant (1 MW). The unit of electrical energy cost for the Cappadocia region was compared with benchmarks from case studies. The effectiveness of wind energy potential is apparently high for the Cappadocia region. The cost of electrical energy for the Cappadocia region was more efficient than the other case studies that referred the significance of an economic analysis of the wind power plant.Öğe Energy and exergy analyze of PEM fuel cell: A case study of modeling and simulations(Pergamon-Elsevier Science Ltd, 2018) Taner, TolgaThis study presents the performance of a proton exchange membrane (PEM) fuel cell in terms of its pressure and voltage parameters. The aim of this study is to improve the performance, efficiency and development of modeling and simulations of PEM fuel cells by experimental optimization. PEM fuel cell performance was researched using an open cathodic plate fuel cell, the effect of fuel cell's performance. PEM fuel cell efficiency was measured in terms of operating pressure and voltage parameters. The energy and exergy efficiencies of the PEM fuel cell were found to be 47.6% and 50.4%, herein. In this study, these results indicate that waste water of experimental work comprehends importance of the PEM fuel cell life-time. (C) 2017 Elsevier Ltd. All rights reserved.Öğe Energy-exergy analysis and optimisation of a model sugar factory in Turkey(Pergamon-Elsevier Science Ltd, 2015) Taner, Tolga; Sivrioğlu, MecitThis study is related to the energy and exergy analysis of a model sugar factory in Turkey. In this study, energy efficiency issue in food industries are investigated within a general context to provide energy saving by reducing energy exergy losses in the sugar production process. The aim of this study is to determine the best energy and exergy efficiency with the mass and energy balances according to design parameters for a sugar factory. Energy savings that can be applied in food industries are examined. Appropriate scenarios are prepared, and optimization results are compared. As a result of thermodynamics calculations made according to the 1st and 2nd Laws of Thermodynamics, energy and exergy efficiencies of a factory were calculated. Factory total energy efficiency and exergy efficiency were found to be 72.2% and 37.4%, respectively, and according to these results, energy quality was found to be 0.64. In conclusion, the current turbine power process energy and exergy efficiencies were 46.4% and 27.7%, respectively, and the optimized turbine power process energy and exergy efficiencies were 48.7% and 31.7%, respectively. This study performs an attitude to the problem of exergy optimization of the turbine power plant. An overall assessment of the energy and exergy efficiency calculations is performed and is focused on how they should be. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Exergy analysis of a circulating fluidized bed power plant co-firing with olive pits: A case study of power plant in Turkey(Pergamon-Elsevier Science Ltd, 2017) Topal, Hüseyin; Taner, Tolga; Naqvi, Syed Arslan Hassan; Altınsoy, Yelda; Amirabedin, Ehsan; Özkaymak, MehmetThe effects of the above-mentioned parameters on exergy destruction, and CO2 emission of the power plant are determined for circulating fluidized bed power plant co-firing. The aim of this study is to perform thermodynamic analysis on can Circulating Fluidized Bed Power Plant (CFBPP) co-fired with olive pits. The results of this study also show that the total exergy damage of the plant is about 295 MW and the net exergy yield is 31.26%. The majority (252.40 MW) of exergy destruction occurs in the main boiler and accounts for 86.05% of the total exergy breakdown of CFBPP through exergy analysis. The results show that CFBPP has an effective feature of biomass supplement for exergetic performance and CO2 emissions. (C) 2017 Elsevier Ltd. All rights reserved.Öğe Forecasting natural gas demand in Istanbul by artificial neural networks method and planning of city gate stations(Gazi Universitesi, 2024) Balıkçı, Vedat; Gemici, Zafer; Taner, Tolga; Dalkılıç, Ahmet SelimIn this study, daily and hourly natural gas demand for Istanbul’s Anatolian and European sides are estimated by using Artificial Neural Networks. Parameters affecting natural gas usage such as the number of consumers, average daily temperature, minimum daily temperature, official holidays, and heating degree days have been determined. By means of the data obtained from the year 2008 to the end of 2018, the forecasting model created by the MATLAB software estimates the natural gas demands up to 2027 according to the coldest day of Istanbul in the last century, which occurred on 9 February 1929, with the minimum daily temperature of -16? and the average daily temperature of -7?. As a result of this study, it is decided which natural gas city gate station will be constructed with natural gas demand forecast. When we view it from the perspective of a natural gas distributor, correct predictive values reduce the errors and make gas distribution planning correctly. In this way, gas systems become much more realistic and profitable. Also, from the customer’s point of view, because the correct predictive values reduce the errors that may occur in the system, the model minimizes the probability of being out of gas. Moreover, with Synergi Gas Software, new solutions can be produced for possible bad scenarios in advance, taking into account the velocity and pressure criteria of the distribution network located on İstanbul’s Anatolian and European sides where the natural gas city gate station will be constructed.Öğe Hydrogen production through alkaline electrolyzers: a techno-economic and enviro-economic analysis(John Wiley and Sons Inc, 2023) Naqvi, Syed Arslan Hassan; Taner, Tolga; Özkaymak, Mehmet; Ali, Hafiz MuhammadHydrogen production through an alkaline electrolyzer as well as a techno-economic and enviro-economic analysis are presented. The proposal of this innovative study is to generate hydrogen gas energy from an alkaline electrolyzer energy system. The prototype of this alkaline electrolyzer was developed by application of hydrogen production through alkaline electrolyzer optimization. This novel chemical mixture is made up from the combination of ammonia, ethyl alcohol, urea, and deionized or distilled water. The result proved to be a model study by emphasizing the annual profit of the alkaline electrolyzer of a simple payback period of the prototype system. A prototype of alkaline electrolyzer is designed and developed to produce oxyhydrogen gas through water electrolysis.Öğe Investigation of the effect of boron additive to lubricating oil on engine performance, exhaust, and emissions(Elsevier Ltd, 2022) Akbıyık, Talip; Kahraman, N.; Taner, TolgaIn this study, the effect of adding doped boron to lubricating oil on engine performance and emissions, in the cases of using gasoline and natural gas as fuel, was investigated in a spark ignition engine. The engine was initially run on a mixture of undoped boron lubricating oil, gasoline, and natural gas. Subsequently, engine performance and emission values were measured in the work, after the engine was run for 50 h. The same measurements were repeated for both the initial values and the values after 50 h with gasoline and natural gas by adding boron to the lubricating oil. Experimental results revealed that using boron-doped lubricating oil causes an average of 2.4–8% reduction in specific fuel consumption when using gasoline and natural gas as fuel in the engine. It was found that the use of boron in the lubricating oil did not make a significant change in C2, CO, and HC emissions, but caused a significant 11.4–12.9% reduction in NOX emissions. As a result, it was observed that adding boron-doped lubricating oil in a gasoline engine provides a relative improvement in engine performance and emissions.Öğe Novel air duct designs to estimate the windshield demisting issue for a commercial vehicle(SAGE Publications Ltd, 2024) Akgünlü, Şafak; Özcan, Onur; Bacak, Aykut; Taner, Tolga; Dalkılıç, Ahmet SelimThis study is about the fog on the windshields of passenger buses because it makes it hard for drivers to see, which is dangerous. The goal of the research is to come up with an effective way to spread the produced mist. According to the study, the air duct design, which is connected to the car’s defroster and defrosting system by Kraft hoses, has to be upgraded. The analysis identifies areas in which the current air duct design might be enhanced and then makes design modifications to create a superior design. By conducting climatic chamber experiments on a vehicle equipped with the first air duct design and tracking the actual air velocity values at the nozzle tips, the success of the new technique is assessed. The boundary conditions for the analysis are the observed values. The study involves the utilization of a commercially available software package to conduct investigations on both the original and modified air duct designs. The software package employs a k-? turbulence model that is known to produce reliable results. The data demonstrate that the adjustments made in light of the comparison produced beneficial effects. The maximum air velocities were increased by 23%, while the pressure loss values of the left and right fans were reduced by 2.5% and 2.9%, respectively, due to the modification of the air duct. Significant energy was saved because of the decrease in fan pressure loss, which led to decreases in the power consumption of the left and right fans of 4.2% and 4.7%, respectively. This comparison shows that the newly built air ducts actually increased the flow rate at the system’s fan outlets by 40%.
