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Öğe 4E analysis and operational vibration in domestic refrigeration systems: Effects of refrigerant charge and thermal load(Pergamon-Elsevier Science Ltd, 2025) Deniz, Emrah; Yilmaz, Cihan; Karagoz, Mustafa; Saridemir, Suat; Isiktas, AbdullahRefrigeration is an essential part of both domestic comfort and many industrial processes in which cooling is required for preserving goods like food, drugs etc., and the safe operation of heat-producing machines and appliances. Domestic refrigeration requires more than performance and reliability such as environmental sustainability, economic viability, low noise emission and vibration levels. Vibration in refrigeration system components can also lead to mechanical damage over time which may also increase energy consumption, resulting in further performance losses. A domestic-type vapor compression refrigeration system (VCRS) was comprehensively tested for different refrigerant mass (42 to 102 g with 10 g increments) and thermal load levels (0 to 75 W with 25 W increments) to conduct energy, exergy, environmental, and economic (4E) analyses, as well as the corresponding operational vibration levels. Experimental results showed that energy consumption, isentropic efficiency of the compressor and operational vibration levels increase with increasing refrigerant mass and thermal load, while the coefficient of performance (COP) and exergy efficiency decrease with increasing refrigerant mass and thermal load. The results revealed that the amount of refrigerant and thermal load of the refrigerator play a significant role in the system's overall performance and operational vibrations.Öğe Catalytic combustion efficiency and emission reduction of amorphous boron/lanthanum orthoferrite nano-hybrids in hydrocarbon fuels(Pergamon-Elsevier Science Ltd, 2025) Kucukosman, Ridvan; Yontar, Ahmet Alper; Agbulut, Umit; Saridemir, Suat; Polat, Fikret; Unlu, Cumhur Gokhan; Ocakoglu, KasimThe effects of amorphous boron (AB) hybrid particles decorated with lanthanum orthoferrite particles on the combustion behavior and emission performance of conventional fuels were investigated. They are produced by combining ball-milling amorphous boron particles (AB/BM), Fe3O4 (F2) ferrite produced by sol-gel technique and La0.75Fe1.25O3 (LAF2) and LaFeO3 (LAF3) lanthanum ferrite nanoparticles by an ultrasonication technique. At 2.5 wt% (17353 ppm) particle load, the highest maximum flame temperature of gasoline-based nanofluid droplets was 644 K for AB-B.M., while at 7.5 wt% (52059 ppm) concentrations, the maximum aggregate temperatures were 642 K, 1358 K and 1298 K in the presence of nanohybrid structures based on AB-B.M., AB/LAF2 and AB/LAF3, respectively. At 2.5 wt% concentrations the lowest extinction time was recorded as 1321 ms for fuel droplets containing AB/LAF2 particles and at 7.5 wt% concentrations 1565 ms in the presence of AB-BM particles. According to the diesel engine test results, AB/LAF2 particulates have a 15 % and 17.6 % reduction in HRR compared to D100 at 15 Nm and 45 Nm respectively, and the largest reduction in BSFC values is 8.38 % and 7.99 % respectively at the same loads. At 60 Nm the highest decrease in CO emissions was 0.01 % in the presence of AB/LAF2 particles. The lowest HC emissions were observed in the presence of AB/LAF2 particulates, with 61.7 %, 42.85 %, 30.43 % and 41.37 % reduction in HC emissions compared to pure diesel at 15 Nm, 30 Nm, 45 Nm and 60 Nm respectively. At 30Nm, 45Nm and 60Nm, the lowest NOx emissions were recorded for the D100 + 250AB/LAF2 fuel, with reductions of 6.71 %, 9.33 % and 12.59 % respectively compared to D100.Öğe A comprehensive study on the influences of different types of nano-sized particles usage in diesel-bioethanol blends on combustion, performance, and environmental aspects(Pergamon-Elsevier Science Ltd, 2021) Agbulut, Umit; Polat, Fikret; Saridemir, SuatThis paper aims to discuss the influences of the doping of different types of nanoparticles into the bioethanol-diesel fuel blends on the combustion, performance, and emission aspects. In this viewpoint, the tests are performed at a constant engine speed of 2400 rpm under the varying engine loads from 3 to 12 Nm with the gaps of 3 Nm. Test engine is fuelled with conventional diesel fuel (DF), the binary form of 90% diesel fuel and %10 ethanol (DF90E10), and then separately 100 ppm aluminium oxide (Al2O3) nanoparticles (DF90E10 + A100), and 100 ppm titanium oxide (TiO2) nanoparticles (DF90E10 + T100) into DF90E10 test fuel. In the results, DF90E10 increases brake specific fuel consumption (BSFC) by 6.25% and drops the brake thermal efficiency (BTE) by 2.1% in comparison to those of conventional DF. However, it is noticed that nanoparticles-doped DF90E10 test fuels are being pulled back the worsened performance results thanks to their higher surface to volume ratio, higher cetane number, higher calorific value, superior thermal properties, catalyst role of the accelerating chemical reactions in combustion proces, and high energy density of nanoparticles. Accordingly, BSFC is dropped by 2.25% and 1.26% whilst BTE is enhanced by 3.48% and 2.94% for DF90E10 + A100 and DF90E10 + T100 test fuels, respectively as compared to those of DF. Thanks to the excess oxygen content of ethanol and oxygen-donating catalyst role of nanoparticles, carbon monoxide (CO) is reduced by 14.29%, 25%, and 21.43%, and hydrocarbon (HC) is reduced by 21.32%, 30.15%, and 26.47% for DF90E10, DF90E10 + A100, and DF90E10 + T100, respectively as compared to those of conventional DF. NOx emission increases by 3.6% for DF90E10, and then nitrogen oxides (NOx) are reduced by 3.02%, and 1.57% for DF90E10 + A100 and DF90E10 + T100 due to the higher thermal conductivity value of nanoparticles and improving engine performance characteristics. On the other hand, the highest in-cylinder pressure (CPmax) and heat release rate (HRRmax) values, and longer ignition delay are generally noticed for the diesel-ethanol binary blend due to the lower cetane number, lower energy density and higher viscosity. In conclusion, this paper is proving that the doping of nanoparticles into the biofuels is presenting very satisfying results in pulling back the worsened engine characteristics arising from using diesel-biofuel binary blends. (C) 2021 Elsevier Ltd. All rights reserved.Öğe Effects of high-dosage copper oxide nanoparticles addition in diesel fuel on engine characteristics(Pergamon-Elsevier Science Ltd, 2021) Agbulut, Umit; Saridemir, Suat; Rajak, Upendra; Polat, Fikret; Afzal, Asif; Verma, Tikendra NathThis paper examines the effect of adding high dosage of copper oxide (CuO) nanomaterials (<77 nm) directly to conventional diesel fuel. The performance of the fuel with CuO added is assessed using a single cylinder, naturally aspirated, direct injection, air-cooled diesel engine. Examined were the char-acteristics of combustion and emissions for blends of 1000 and 2000 ppm CuO nanoparticles. The CuO blends were tested in the speed range between 2000 and 3000 rpm at intervals of 250 rpm. The CuO nanoparticles have the potential to accelerate the process of combustion by supplying molecules of oxygen and acting as a catalyst. The CuO enhances the thermal conductivity of the test fuels and in-creases heat dissipation from the combustion chamber. Experimental results show exhaust gas tem-perature (EGT) is reduced as well as unburnt hydro-carbons (HC) and oxides of carbon and nitrogen (CO and NOx). For CuO additions of 1000 and 2000 ppm, CO emissions fell by 14.6% and 20.8%, HC emissions by 6.2% and 13.4%, and NOx emissions by 4%, and 4.7%. Both blends of CuO increased the heating value of the diesel fuel. Brake-specific fuel consumption (BSFC) dropped by 4.5% and 8% while brake thermal efficiency (BTE) increased by 5.5% and 14.6% for 1000-CuO and 2000-CuO, respectively. On the other hand, nanoparticles accelerated the chemical reactions and the ignition delay (ID) period was shortened by 3.03% and 5.45% for CuO additions of 1000, and 2000 ppm, respectively. It was also observed that CuO nanoparticles up to 2000 ppm can be suspended in diesel fuel without clogging the filter on the injection system. (c) 2021 Elsevier Ltd. All rights reserved.Öğe Energy, exergy, and emission (3E) analysis of hydrogen-enriched waste biodiesel-diesel fuel blends on an indirect injection dual-fuel CI engine(Pergamon-Elsevier Science Ltd, 2025) Bayramoglu, Kubilay; Bayramoglu, Tolga; Polat, Fikret; Saridemir, Suat; Alcelik, Necdet; Agbulut, UmitLimited fossil energy reserves and rising energy costs increase the importance of alternative renewable energy sources and more efficient use of energy. Hydrogen gas is an alternative renewable energy source for internal combustion engines due to its high combustion efficiency and lower calorific value and near-zero emissions. For more efficient and effective use of internal combustion engines, exergy analysis is also important along with energy analysis. In this study, biodiesel fuel obtained from waste cooking oil was blended with 20 % diesel fuel. Energy and exergy analyses were performed for the test fuels obtained by adding hydrogen at different ratios to the resulting fuel mixture. The experiments were carried out on a 3-cylinder, water-cooled, pre-combustion chamber diesel engine at a constant engine speed of 2200 rpm and under different loads (15 Nm, 30 Nm, 45 Nm and 60 Nm). Fuel energy ratio was calculated as 17.84 kW, 19.71 kW, 18.03 kW, 17.89 kW and 17.86 kW for D100, B20, B20H10, B20H20, B20H30 and B20H40 fuel blends, respectively. It was observed that heat loss increased by 10 %, mechanical energy rate increased by 100 % and exhaust energy rate increased by 57 % when 30 Nm torque energy flow rates were compared with 15 Nm torque case. Compared to 15 Nm engine load, fuel, exhaust, mechanical work and heat loss energy flow increases by 200 %, 300 %, 300 % and 100 % for 60 Nm engine load. The exergy destruction rate declines with increased engine loads. The exergy destruction rate constitutes approximately 46.7 % of the total exergy rate for 60 Nm engine load. The highest first- and second- law efficiencies for all test fuel are detected when the engine runs at 45 Nm. At this engine load, the first law efficiency is calculated to be 29.53 %, 27.91 %, 28.94 %, 29.4 %, 29.72 %, and 30.47 %, and the second law efficiency is calculated to be 27.62 %, 26.08 %, 27.05 %, 27.50 %, 27.81 %, and 28.52 % for D100, B20, B20+H10, B20+H20, B20+H30, and B20+H40.Öğe Energy, exergy, economic and sustainability assessments of a compression ignition diesel engine fueled with tire pyrolytic oil - diesel blends(Elsevier Sci Ltd, 2020) Karagoz, Mustafa; Uysal, Cuneyt; Agbulut, Umit; Saridemir, SuatEvery year, millions of tons of tire become unusable around the world and waste tire dumps threaten human health and the environment. Therefore, recycling of waste tires has attracted attention recently. In this study, energy, exergy, economic and sustainability analyses of a compression ignition diesel engine fueled with tire pyrolytic oil-diesel blends were performed and the results were compared with that of neat diesel. Tire pyrolytic oil was produced from waste tires with vacuum pyrolysis technique. Hydro-sulfuric acid treatment, vacuum distillation and oxidative desulfurization processes were applied to reduce emission values of tire pyrolytic oil. Tire pyrolytic oil was blended with neat diesel as 10 vol% (TPO10D90), 30 vol% (TPO30D70) and 50 vol% (TPO50D50). The test engine was single-cylinder, four-stroke, naturally aspirated, compression ignition diesel engine and the experiments were conducted for different test engine loads of 3 Nm, 6 Nm, 9 Nm and 12 Nm at constant crankshaft speed of 2000 rpm. The highest energy and exergy efficiencies were obtained for TPO10D90, while the lowest ones were obtained for neat diesel. At 12 Nm, the energy efficiency of test engine was obtained to be 26.89% for neat diesel and 28.15% for TPO10D90, while the exergy efficiency of test engine was found to be 25.19% for neat diesel and 26.36% for TPO10D90. The energy loss per capital investment cost was obtained to be 0.87 x 10(-4) kW/$ for TPO10D90 and 1.03 x 10(-4) kW/$ for neat diesel at 3Nm. At 12 Nm, the highest sustainability index was determined to be 1.358 for TPO10D90, while the lowest sustainability index was 1.337 for neat diesel. Results showed that TPO10D90 had better performance at each test engine load in terms of energy, exergy, economic and sustainability and the increase in tire pyrolytic oil content of blend made the results worse but better than neat diesel. As a conclusion, it can be said that tire pyrolytic oil production from waste tires is important fact from the viewpoint of both waste management and protection of fossil fuel resources depletion. (C) 2020 Elsevier Ltd. All rights reserved.Öğe Energy, exergy, thermoeconomic, exergoeconomic, and sustainability analyses of hydrogen-enriched diesel-biodiesel nano fuels(Pergamon-Elsevier Science Ltd, 2025) Bayramoglu, Kubilay; Polat, Fikret; Bayramoglu, Tolga; Saridemir, Suat; Agbulut, UmitThis work intends to discuss the thermodynamic, economic, and sustainability analysis of hydrogen-enriched biodiesel-diesel and nanoparticle blends. In this direction, sunflower methyl ester (20 %) and diesel fuel (D100) are volumetrically blended (B20). Then, cerium oxide (CeO2) nanoparticles are added to B20 at a mass fraction of 100 ppm (B20CeO2). Furthermore, hydrogen of 5 lpm (B20CeO2H5) and 10 lpm (B20CeO2H10) is introduced into the combustion chamber from the intake manifold by mixing with the fresh air. The test engine is loaded from 15 to 60 Nm with increments of 15 Nm while it runs at a constant engine speed of 2000 rpm. The results show that the highest energy efficiencies are 28.9 % for B20CeO2H10 at 45 Nm. Besides, the highest exergy efficiencies are 27.01 % and B20CeO2H10 at 45 Nm. On the other hand, the best results are generally obtained for the B20CeO2H10 test fuel in terms of exergoeconomic and sustainability results. Crankshaft work has a particular work specific exergy cost of 138.9 US$/GJ for D100 and 184.6 $/GJ for B20CeO2H10. The sustainability index is determined as 1.37 for B20CeO2H10. In conclusion, these results reveal that adding nanoparticles and hydrogen considerably enhances the thermodynamic, economic, and sustainability metrics of the engine fuelled with diesel-biodiesel fuels.Öğe Enhancing diesel engine performance, combustion, and emissions reductions under the effect of cerium oxide nanoparticles with hydrogen addition to biodiesel fuel(Pergamon-Elsevier Science Ltd, 2024) Polat, Fikret; Saridemir, Suat; Gad, M. S.; El-Shafay, A. S.; Agbulut, UmitIn order to enhance engine combustion and emissions, inclusion of nano additives containing hydrogen is recommended due to the high viscosity, poor calorific value, atomization, and vaporization issues of biodiesel. Transesterification was used to transform sunflower oil into methyl ester. Sunflower biodiesel of 20% by volume was blended with diesel fuel, and CeO2 nanoparticles of 100 ppm were added to blends. Hydrogen was introduced by 5 and 10 lpm from intake manifold. Diesel engine operated at 2000 rpm and loads of 15, 30, 45, and 60 N m. BSFC was decreased by 1.77%, 4.71%, and 7.19% but BTE was improved by 1.39%, 4.04%, and 7.01% when cerium oxide, 5, and 10 lpm hydrogen were added to B20, respectively. When methyl ester mixture was combined with nano additive and H2 at 5 and 10 lpm, respectively, EGT was reduced by 2.62, 4.77, and 6.73%. B20+ CeO2 and B20+ CeO2+ 5 lpm, and B20+ CeO2+ 10 lpm showed decreases of 46.51%, 56.59%, and 63.57% in CO emissions but the declines in NOx were 6.34, 13.6% and 20.71%, respectively compared to diesel oil. Inclusion of nano-doped hydrogen at 5 and 10 lpm reduced HC emissions by 12.09% and 28.57%, respectively, about diesel. Hydrogen addition of 5 and 10 lpm to CeO2-doped B20 improved the in-cylinder pressures by 3% and 3.52% but the maximum heat release rate increases were 3% and 3.52% respectively compared to diesel. Biodiesel from sunflower oil with 100 ppm CeO2 with hydrogen shows reductions in emissions and combustion enhancement.Öğe Exergetic and exergoeconomic analyses of a CI engine fueled with diesel-biodiesel blends containing various metal-oxide nanoparticles(Pergamon-Elsevier Science Ltd, 2021) Karagoz, Mustafa; Uysal, Cuneyt; Agbulut, Umit; Saridemir, SuatComprehensive exergetic and exergoeconomic analyses of a single-cylinder, four-stroke, naturally aspirated compression ignition (CI) diesel engine were conducted in the present paper. Exergy-based sustainability indicators were also determined in the study. The test engine was fueled with diesel fuel (D100), %90 diesel+10% waste cooking oil methyl ester blend (D90B10), D90B10 with Al2O3 nanoparticle of 100 ppm (D90B10Al(2)O(3)), D90B10 with TiO2 nanoparticle of 100 ppm (D90B10TiO(2)), and D90B10 with SiO2 nanoparticle of 100 ppm (D90B10SiO(2)) nanofuels, separately. The tests were performed at a constant engine speed of 2000 rpm and at varying engine loads from 2.5 to 10 Nm with an increment of 2.5 Nm. As a result, the exergy efficiencies of the test engine for D90B10 and D90B10Al(2)O(3) were determined to be 25.57% and 28.12%, respectively. The lowest cost flow rate of crankshaft work was found to be 0.4247 US$/h at 2.5 Nm, 0.5154 US$/h at 5 Nm for D90B10Al(2)O(3), and 0.6029 US$/h at 7.5 Nm, 0.7253 US$/h at 10 Nm for D90B10SiO(2). At 10 Nm, the highest and lowest sustainability index values were determined to be 1.391 for D90B10Al(2)O(3) and 1.344 for D90B10, respectively. From the perspective of exergy and sustainability, D90B10Al(2)O(3) had the best results. Besides, from the perspective of exergoeconomics, D90B10Al(2)O(3) had the best results at lower engine loads. As a conclusion, it can be said that nanofuels showed better performances compared to neat diesel fuel and diesel-biodiesel blend in the terms of in terms of exergy, exergoeconomics, and sustainability analyzes. Considering all analyses together, it is noticed that Al2O3-doped nanofuel is the best test fuel for this study, and then it is followed by SiO2 and TiO2-doped nanofuels, respectively. (C) 2020 Elsevier Ltd. All rights reserved.Öğe Exergetic and exergoeconomic assessments of a diesel engine operating on dual-fuel mode with biogas and diesel fuel containing boron nitride nanoparticles(Springer, 2024) Uysal, Cuneyt; Agbulut, Umit; Topal, Halil Ibrahim; Karagoz, Mustafa; Polat, Fikret; Saridemir, SuatThis study investigates the exergetic and exergoeconomic analyses of a diesel engine operated on dual-fuel mode with fuelled both diesel fuel-boron nitride nanofuel and biogas purchased commercially. The experiments were performed for diesel fuel, diesel + 100 ppm boron nitride nanoparticle, diesel + 100 ppm boron nitride nanoparticle + 0.5 L min-1 biogas, diesel + 100 ppm boron nitride nanoparticle + 1.0 L min-1 biogas and diesel + 100 ppm boron nitride nanoparticle + 2.0 L min-1 biogas at various engine loads (2.5 Nm, 5.0 Nm, 7.5 Nm, and 10.0 Nm) and fixed crankshaft speed of 1500 rpm. The obtained experimental data were used to realize exergetic and exergoeconomic analyses. Among the fuels considered in this study, diesel + 100 ppm boron nitride nanoparticle nanofuel had the best exergetic and exergoeconomic results. As a result, at engine load of 10 Nm, the exergy efficiency of test engine and specific exergy cost of crankshaft work were obtained to be 29.12% and 124.86 US$ GJ-1 for diesel + 100 ppm boron nitride nanoparticle nanofuel, respectively. These values were 27.35% and 125.19 US$ GJ-1 for diesel fuel, 25.50% and 141.92 US$ GJ-1 for diesel + 100 ppm boron nitride nanoparticle + 0.5 L min-1 biogas, 23.10% and 156.33 US$ GJ-1 for diesel + 100 ppm boron nitride nanoparticle + 1.0 L min-1 biogas, and 21.09% and 171.92 US$ GJ-1 for diesel + 100 ppm boron nitride nanoparticle + 2.0 L min-1 biogas, respectively. It is clear that biogas addition to combustion made worse the exergetic and exergoeconomic performances of test engine. As a conclusion, it can be said that diesel + 100 ppm boron nitride nanoparticle nanofuel can be used as alternative fuel to D100 in terms of exergy and exergoeconomics.Öğe Experimental investigation of fusel oil (isoamyl alcohol) and diesel blends in a CI engine(Elsevier Sci Ltd, 2020) Agbulut, Umit; Saridemir, Suat; Karagoz, MustafaThe present paper details an experimental investigation of the combustion behaviours, exhaust emission and performance characteristics of a single-cylinder diesel engine fueled with fusel oil-diesel blends of volumetrically 10%, 15% and 20% into neat diesel fuel (F0) separately. Under steady-state conditions, the tests were performed at constant engine speed (2000 rpm), and four different engine loads (2.5, 5, 7.5 and 10 Nm). The results showed that CO and NOx emissions significantly reduced down to 52% and 20%, respectively with an increasing percentage of the fusel oil in the fusel oil-diesel blends. However, HC gradually increased up to 40% with the addition of fusel oil. With respect to the performance of the engine, the lowest BSFC and the highest BTE were seen in F0 test fuel owing to the higher heating value of F0. On the other hand, duration in ignition delay (ID) of fusel oil-diesel blends was longer than that of F0 due to the lower cetane number of the fusel oil. The maximum in-cylinder pressure (CPmax) and maximum heat release rates (HRRmax) of fusel oil containing fuels is higher in comparison with diesel fuel owing to the longer ID and oxygen atoms of excessive fusel oil. The combustion characteristics of fusel oil-diesel blends closely followed those of neat diesel fuel.Öğe A general view to converting fossil fuels to cleaner energy source by adding nanoparticles(Taylor & Francis Ltd, 2021) Agbulut, Umit; Saridemir, SuatOnly 1-liter diesel combustion causes nearly 2.9 kilograms of greenhouse gas emissions (GHG), and currently, the global-oil-consumption averaged 1.6 million barrels per day. Today, millions of people are suffering from serious diseases and even dying due to harmful exhaust gases (HEG) arising from burning fossil fuels such as cancer, respiratory diseases, cardiovascular, visibility reductions etc. On the other hand, many countries, signed the Kyoto Protocol, fail to keep their promise to reduce their GHG level. Clearly, there is a necessity to improve methods reducing HEG and to keep an acceptable level. Adding nanoparticles to diesel is one of these effective methods by converting diesel to a more clean energy source. Owing to the high thermal properties of nanoparticles as compared to pure diesel fuels, they promote better combustion in internal combustion engines, and so reduction HEG via this way. In this study, a number of literature studies on nanoparticles applications to pure fossil fuels are well documented and evaluated the outputs.Öğe Impact of various metal-oxide based nanoparticles and biodiesel blends on the combustion, performance, emission, vibration and noise characteristics of a CI engine(Elsevier Sci Ltd, 2020) Agbulut, Umit; Karagoz, Mustafa; Saridemir, Suat; Ozturk, AhmetWith the burning of 1 L of diesel fuel, approximately 3 kg of greenhouse gas is released into the atmosphere. Therefore, it is of great importance to reduce emissions with some additives in diesel engines. This study deals with the impacts of blends of waste cooking oil methyl ester and various metal-oxide based nanoparticles on the emission, combustion, performance, vibration and noise characteristics of a single-cylinder diesel engine. The test engine was loaded at different engine loads of 2.5, 5, 7.5 and 10 Nm and a constant engine speed of 2000 rpm. In this investigation, various fuels [called as reference diesel (D100), 10 vol% of waste cooking oil methyl ester (B10), and finally the mass fractions of 100 ppm aluminium oxide (B10Al(2)O(3)), titanium oxide (B10TiO(2)) and silicon oxide (B10SiO(2)) into the B10, separately] were tested. The addition of metal-oxide based nanoparticles has firstly increased the viscosity, cetane number, and heating value of biodiesel. Higher oxygen atoms in biodiesel-nanoparticles blends have improved the quality of the combustion process. Higher peak point in CPmax and HRRmax could be reached in these nano fuels due to their lower cetane numbers than that of D100. CO, HC and NOx emissions were significantly reduced with the blending of nanoparticles and biodiesel in comparison with those of D100. The addition of nanoparticles highly improved engine performance. B10 had the lowest thermal efficiency due to its heating value, but its efficiency was converted to the highest one with the addition of nanoparticle. In conclusion, this study is suggesting that the addition of metal-oxide based nanoparticles into biodiesel blends can give better results than using biodiesel alone for diesel engines.Öğe Improvement of worsened diesel and waste biodiesel fuelled-engine characteristics with hydrogen enrichment: A deep discussion on combustion, performance, and emission analyses(Elsevier, 2024) Saridemir, Suat; Polat, Fikret; Agbulut, UmitDue to the strict emission policies, fuel researchers are dedicated to mitigating the tailpipe emissions from internal combustion engines (ICEs). Therefore, researchers have considered biodiesel as the best alternative to conventional diesel fuel (D) for a while. However, many scientific papers experimentally announced that the use of biodiesel significantly worsens engine behaviors. In this framework, hydrogen enrichment has become a very reasonable option in order to minimize the reverse influences of biodiesel-fuelled engine characteristics. In this direction, waste cooking of 25% (B25) was volumetrically blended to D and reference data was collected. Then, 15 and 30 Lpm hydrogen was introduced from the intake manifold by mixing with air along with B25 test fuel to observe the changes from the hydrogen effect. Tests were performed on a three-cylinder, water-cooled diesel engine at constant engine speed (2000 rpm) and variable engine loads (15, 30, 45 and 60 Nm). In the results, it is witnessed that BSFC (brake specific fuel consumption) for B25 fuel increased by 8.23% as compared D fuel. However, along with the introduction of 15 and 30 Lpm hydrogen to B25 fuel, the BSFC value dropped by 17.58%, and 30.75%, respectively. In a similar way, B25 test fuel reduces BTE (brake thermal efficiency) by 7.54% as compared to D fuel. However, the hydrogen introduction of 15 and 30 Lpm (Litre per minute) along with B25 fuel improves the BTE value by 10.19%, and 17%, respectively. On the other hand, the inclusion of 15 Lpm and 30 Lpm H2 to B25 fuel provided a reduction of 23.75% and 45.59% for HC (Hydrocarbon) emissions, and 53.1% and 62.6% for NOx (Nitrogen oxide) emissions, respectively. In conclusion, it is seen that deteriorations in combustion, performance, and emission characteristics resulting from the use of biodiesel can be minimized by using hydrogen for ICEs.Öğe An investigation of Al2O3-ZrO(2)ceramic composite-coated engine parts using plasma spray method on a diesel engine(Taylor & Francis Ltd, 2020) Mert, Sevda; Mert, Senol; Saridemir, SuatIn this study, the surfaces of the piston, cylinder head and valve parts of the combustion chambers for a single-cylinder diesel engine were coated at 250 mu m thick ceramic composite Al2O3-ZrO2(20-80%) main coating material and 100 mu m NiCrAl interlayer material. Also, B6 and B12 biodiesel fuels were produced. Fuel blends were tested on a diesel engine with thermal barrier-coated surfaces for 50 h under the same conditions. When the SEM images and the EDS analysis results of the pistons covered with the ceramic composite main coating material are examined, it has been seen that the coating material permeates the surfaces in a very homogeneous manner and allows to work with high performance without causing any deterioration on the surfaces during working. At high temperatures, the working periods of 50 h and the formation of smoke did not cause any damage to the main material and the coating material.Öğe IS THE ETHANOL ADDITIVE MORE ENVIRONMENTALLY FRIENDLY FOR A SPARK IGNITION (SI) ENGINE OR FOR A COMPRESSION IGNITION (CI) ENGINE?(Gh Asachi Technical Univ Iasi, 2020) Agbulut, Umit; Saridemir, SuatClearly, the purpose of this paper is to find an answer to the following question Is the ethanol additive more environmentally friendly for an SI engine or for a CI engine?. The tests, therefore, were conducted on both an SI and a CI engine for the same parameters under both same conditions and laboratory. Ethanol was blended into neat diesel (D100) and neat gasoline (G100) at the same proportion (10 vol. %) and two blends were prepared in the study, namely D90E10 and G90E10, respectively. Then the tests were conducted on different engine speeds varying from 2250 to 3250 rpm with an interval of 250 rpm. In the experimental results achieved in the study, the most reductions among exhaust emissions, as compared to reference-D100 and reference-G100 fuel type, were achieved in HC and CO emissions with the presence of ethanol. With the addition of ethanol, HC and CO emissions in the SI engine reduced by 47.9% and 47.0%, respectively; on the other hand, these emissions also reduced by 28.5% and 25.1%, respectively in CI engine. An interesting result from this paper is that NOx emission was slightly reduced by 2.3% for SI engine with the addition of ethanol, whilst it is observed an increase of approximately 40% for the CI engine. This study showed that the addition of ethanol can be used in both SI and CI engines without any modification and can result in a significant reduction in exhaust emissions. In conclusion, this paper is distinctly reporting that the presence of ethanol into diesel fuel has presented better results than those of gasoline fuel in terms of exhaust emissions.Öğe Modifying diesel fuel with nanoparticles of zinc oxide to investigate its influences on engine behaviors(Elsevier Sci Ltd, 2023) Rajak, Upendra; Reddy, V. Nageswara; Agbulur, Umit; Saridemir, Suat; Afzal, Asif; Verma, Tikendra NathIn this paper, we used experimental and numerical methods to explore the effects of a diesel fuel blend con-taining zinc oxide (ZnO) nanoparticles at three different concentrations (0.025%, 0.05%, and 0.1%) on the combustion, injection, performance, and emission characteristics of a diesel engine running at constant speeds of 2000 rpm, 2250 rpm, 2500 rpm, 2750 rpm, and 3000 rpm, with the engine operating at full load. The results of the experiments demonstrate that DF + 0.1% ZnO increases BTE by 11.7% at 2500 rpm, while decreasing SFC by 1.67%, exhaust gas temperature by 11.4%, and NOx emissions by 10.67%. The advanced injection time and load were kept same, but a 2.3% rise in cylinder pressure was achieved when ZnO nano additions to diesel fuel were used. Moreover, CO2 emissions were reduced by 7.6% compared to 2500 rpm. In conclusion, the results prove that the nanoparticle-added test fuels improve engine efficiency, and combustion yield by reducing exhaust pollutants, and the numerical results are in good agreement with the experimental results.Öğe Novel green hydrochar production for renewable fuel substitutes, and experimental investigation of its usability on CI engine performance, combustion, and emission characteristics(Pergamon-Elsevier Science Ltd, 2025) Saridemir, Suat; Polat, Fikret; Simsir, Hamza; Uysal, Cuneyt; Agbulut, UmitIn the present work, green hydrochars from renewable sources (cellulose (HC-Cel), and glucose (HC-Glu) are obtained via the hydrothermal carbonization method. Then different dosages (100 ppm, and 200 ppm) of these nano-sized hydrochar particles are added to the waste cooking oil biodiesel (20 %) and diesel blends (80 %) with the aid of an ultrasonification process. The experiments are performed at an indirect injection, water-cooled, three-cylinder diesel engine. During the experiments, the engine runs at a fixed engine speed of 2000 revolutions per minute (rpm), and at different loading conditions (15-60 Nm with intervals of 15 Nm). Then the impact of hydrochar addition to the diesel-biodiesel blends under these operation parameters is discussed in terms of engine behaviors (combustion, performance, and environmental). Considering the engine performance outputs, the brake specific fuel consumption (BSFC), and brake thermal efficiency (BTE) metrics for B20 are firstly 9.74 % higher, and 9 % lower than D100. The addition of 100 ppm HC-Glu, 200 ppm HC-Glu, 100 ppm HC-Cel, 100 ppm HC-Cel, and 200 ppm HC-Cel to B20 decreased the BSFC values by 17 %, 21.9 %, 15.31 %, 22.76 %, and enhanced the BTE by 13 %, 16 %, 12.07 %, 16.7 %, respectively. On the other hand, significant drops of 27.45 %, 39.22 %, 18.63 %, and 30.39 % for Carbon monoxide (CO) emission, 7.80 %, 12.52 %, 9.11 %, and 11.54 % for Nitrogen oxide (NOx) emission, and 8.91 %, 19.80 %, 5.94 %, and 15.84 % for uHC emission are recorded for B20 + 100 ppm HC-Glu, B20 + 200 ppm HC-Glu, B20 + 100 ppm HC-Cel, and B20 + 200 ppm HC-Cel test fuels, respectively. In conclusion, this work proves that hydrochars are efficient green agents to improve the worsened engine combustion, performance, and emission characteristics of diesel-biodiesel binary mixtures.Öğe On-board hydrogen-rich syngas production via waste heat recovery from compression-ignition engines: maximizing hydrogen content with novel multi-objective algorithms(Pergamon-Elsevier Science Ltd, 2025) Agbulut, Umit; Vozka, Petr; Bakir, Huseyin; Brieu, Nathan A.; Polat, Fikret; Saridemir, SuatA significant portion of fuel energy in internal combustion engines is lost as waste heat, yet limited efforts have been made to recover it effectively. This research explores the utilization of exhaust heat from a diesel engine to produce H2-rich syngas through the methanol-steam reforming (MSR) process. The engine operates at varying loads (15, 30, 45, and 60 Nm) while maintaining a constant speed of 2000 rpm. Exhaust heat is redirected to an MSR reactor, where the methanol-to-water (MtW) molar ratio is adjusted (0.5, 1, 1.5, and 2). Results reveal that the highest hydrogen content in syngas (70.3 %) is achieved at an engine load of 30 Nm and an MtW ratio of 1. To further optimize hydrogen production, three novel algorithms (DSC-MOPSO, MOSPO, and MOGWO) are applied to key operation parameters. Optimization increases hydrogen content to 72.5 % with DSC-MOPSO, 72.4Öğe Performance enhancement and emission control through adjustment of operating parameters of a biogas-biodiesel dual fuel diesel engine: An experimental and statistical study with biogas as a hydrogen carrier(Pergamon-Elsevier Science Ltd, 2024) Mohite, Avadhoot; Bora, Bhaskor Jyoti; Sharma, Prabhakar; Saridemir, Suat; Mallick, Debarshi; Sunil, S.; Agbulut, UmitThis study explores emissions regulation of a 3.5 kW single cylinder, direct injection, diesel engine fuelled with biogas and Mahua biodiesel. By varying the compression ratio from 17 to 18 with a step of 0.5, pilot fuel injection timing by 3 degrees BTDC from 23 degrees BTDC to 32 degrees BTDC, and engine load from 20% to 100% with a step of 20%, the optimal operating conditions are determined using response surface methodology. At the optimum engine operating parameter settings of a 17.73 compression ratio, 26.71 degrees BTDC pilot fuel injection timing, and 58.96% engine load, the optimum emissions are 42.89 ppm for NOx, 80.36 ppm for UHC, 4.23% Vol. for CO2, and 77.72 ppm for CO. Additionally, the study demonstrates a comparable brake thermal efficiency of 17.35% with 66.26% pilot fuel substitution, indicating biogas-biodiesel as a sustainable and renewable option for dual-fuel CI compressionignition engines.(c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
