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Selim Demirtürk

Other affiliations: Süleyman Demirel University
Bio: Selim Demirtürk is an academic researcher from Uşak University. The author has contributed to research in topics: Ignition system & Exhaust gas recirculation. The author has an hindex of 2, co-authored 5 publications receiving 16 citations. Previous affiliations of Selim Demirtürk include Süleyman Demirel University.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the effect of different substitution ratios of neat ethanol (E100) and ethanol-gasoline blend E85 on in-cylinder combustion, engine efficiency, and exhaust emissions, in a dual-fuel diesel engine, using the ethanol-diesel blend (DE95).
Abstract: This paper investigated the effect of different substitution ratios of neat ethanol (E100) and ethanol–gasoline blend E85 on in-cylinder combustion, engine efficiency, and exhaust emissions, in a dual-fuel diesel engine, using the ethanol–diesel blend (DE95). Experimental studies realized at 1400 rpm, 1600 rpm, and 1800 rpm engine speeds under constant engine load of 50% (20 Nm). For each engine speed, the injection timing of diesel and E95 fuels at 24 °CA bTDC kept constant while low-reactivity fuels (i.e., E100 and E85) substitution ratio changed in the range of 59–83%. The results showed that premixed fuels in different SRs have an impact on shaping engine emissions, ignition delay (ID), in-cylinder pressure, and heat-release rate. Also, at the dual-fuel experimental studies in all engine speeds, NOx about 47–67% decrease compared to single fuel conditions of reference diesel and DE95, and smoke opacity remained unchanged around 0.1 FSN, whereas HC and CO increased in the range of 20–50%. However, E85/DE95 and E100/DE95 dual-fuel combustion achieved lower brake thermal efficiency (BTE) and combustion efficiency compared to single diesel fuel combustion. On the other hand, in dual-fuel combustion conditions, despite the low combustion efficiency, premixed E85 fuel offered higher engine efficiency and lower exhaust emissions than E100.

21 citations

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TL;DR: In this article, the authors investigated the effect of ethanol addition and hot exhaust gas recirculation (EGR) on engine performance, exhaust emissions, and air-pollution damage-cost in a dual-fuel diesel engine.
Abstract: This paper investigates the effect of ethanol addition and hot exhaust gas recirculation (EGR) on engine performance, exhaust emissions, and air-pollution damage-cost in a dual-fuel diesel engine. ...

13 citations

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TL;DR: In this article , a closed-loop liquid circulation system was developed between the heat collector and the phase change material (PCM) container to transfer the heat transferred from the sun to the PCM container.
Abstract: This paper presents the experimental investigation under real environmental conditions of a solar hybrid energy conversion system consisting of latent heat thermal storage (LHTS) and a PV/T panel. In this context, the heat energy from the sun was transferred to the heat transfer fluid (HTF) by means of a heat collector positioned so as not to affect the solar radiation absorption of the PV/T panel. A closed-loop liquid circulation system was developed between the heat collector and the phase change material (PCM) container to transfer the heat transferred from the sun to the PCM container. In addition, the upper surface was designed with optical material in order to increase the energy storage capacity of the PCM container. In the experimental study, a PV/T panel with a maximum electrical power generation capacity of 40 W, measuring 424 × 674 × 25 mm at a 36° azimuth and tilt angle, was used. Commercial RT55 was used as PCM, and tap water was used as HTF. The experimental study was performed between 9:09 and 18:17 on a sunny day under atmospheric conditions. The results of the paper show that a maximum of 30.56 W of electrical power can be produced from the PV/T panel at 14:00, whereas a maximum of 1.2 W of heat energy can be stored in the PCM container at 11:00. On the other hand, the total power of the solar hybrid energy conversion system reached its maximum value of 31.54 W at 12:00. In addition, the rate of energy stored in the PCM within the solar hybrid energy conversion system reached its highest value at 10:00, with 4.5%.

4 citations

Journal ArticleDOI
25 Jun 2020
TL;DR: Gurbuz ve Akcay, 2015 as discussed by the authors, Gurbuz et al. describe TEJ model in gelistirilmesinde, 1500-4000 rpm motor, 6.36-50,96 W araliginda degismistir.
Abstract: Bu calismada, buji ateslemeli bir motorda atik isi geri kazanimi icin kullanilan termoelektrik jeneratorunun (TEJ) Matlab/Simulink programi ile teorik modeli gelistirilmistir. TEJ modelinin gelistirilmesinde, 1500-4000 rpm araliginda calisan iki silindirli buji ateslemeli bir motorun deneysel calismalarindan elde edilen egzoz gaz sicakliklari ve kutle akis hizlari kullanilmistir. TEJ modeli, egzoz isi esanjoru ve egzoz esanjorunun her iki yuzeyine yerlestirilmis iki motor sogutma suyu esanjorunden olusan uc katmanli bir yapiya sahiptir. Esanjor malzemesi olarak 3 mm kalinliginda 6063-T6 tipi aluminyum malzeme kullanilmistir. Termoelektrik modullerde (TEM) hem n hem de p tipi yari iletkenler icin Bi2Te3 malzemesi secilmistir. Her iki TEJ katmaninda 5x4 duzenlemeye sahip toplam 40 adet TEM kullanilmistir. Matlab/Simulink modelinin sonuclari, onceki calismalarda elde edilen deneysel sonuclarla karsilastirilmistir (Gurbuz ve Akcay, 2015). Sonuc olarak, TEJ'un Matlab/Simulink modeli ile DC elektrik enerjisi uretimi, 1500-4000 rpm motor devri araligi icin 6,36-50,96 W araliginda degismistir. Ayrica, deneysel ve Matlab/Simulink model sonuclari arasinda iyi bir korelasyon (R 2 = 0,991) oldugu tespit edilmistir.

2 citations

Journal ArticleDOI
TL;DR: In this article, the operating characteristics of an on-board proton exchange membrane electrolysis (PEMe) hydrogen generator integrated with a spark ignition (SI) engine were investigated.
Abstract: In this paper, operating characteristics of an on-board proton exchange membrane electrolysis (PEMe) hydrogen generator integrated with a spark ignition (SI) engine were investigated. The e...

2 citations


Cited by
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TL;DR: In this article, a comparative study on combustion and emissions of hydrogen-enriched biogas premixed charge direct injection dual-fuel (DIDF) engine and indirect injection dual fuel (IDIDF engine) engine is presented.
Abstract: This paper presents a comparative study on combustion and emissions of hydrogen-enriched biogas premixed charge direct injection dual-fuel (DIDF) engine and indirect injection dual-fuel (IDIDF) engine. The results show that the IDIDF engine outperforms the DIDF engine in terms of higher indicative engine cycle work (Wi) and lower emissions of CO, soot, and noise, but the disadvantage is higher NOx emission. Under the same fueling condition, the IDIDF engine’s Wi is on average 6% higher than that of the DIDF engine, but the NOx concentration in the combustion products of the IDIDF engine is 1.5 times higher than that of the DIDF engine. The IDIDF engine creates the stratified mixture distribution with higher O2 concentration in the auxiliary combustion chamber, which is favorable for auto-ignition and reduces the ignition delay. The biogas composition affects slightly CO and soot emissions, but significantly affects NOx emission. When the methane composition in biogas increases from 60% to 80%, the soot volume fraction is approximately 0.1 ppm in both types of combustion chambers, the CO concentration varies from 1.4% to 1.8%, and the NOx concentration varies from 3000 to 5000 ppm in the case of IDIDF engine and 2500–4500 ppm in the case of DIDF engine. For both types of dual-fuel engines, when engine speed increases, CO concentration and the soot volume fraction increase, while Wi and NOx concentration decrease.

55 citations

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TL;DR: In this paper, the applicability of DMF in spark-ignition (SI) engines is thoroughly analyzed based on the spray and flame, combustion, performance, and emission characteristics of SI engines running on DMF compared with ethanol and gasoline.
Abstract: Currently, the supply of diminishing fossil fuel reserves, and the rise in challenges in environmental, political and economic consequences have caused the great concerns in the development of modern society; these have forced the policy-makers and researchers to look for the renewable and green energy sources. Deemed as a promising renewable alternative to traditional fossil fuels, 2,5-dimethylfuran (DMF, chemical formula C6H8O)—a derivative of furan—has the potential to relieve the growing shortage of fossil fuels while satisfying the increase in global energy demand and minimizing the adverse effects of climate change. DMF can be used as a clean source of liquid transportation biofuel given the fact that it is directly obtained from biomass-derived carbohydrates. In reviewing current DMF production methods, this review paper analyzes and presents the comparison of catalytic performance in the conversion of biomass into DMF. In addition, the applicability of DMF in spark-ignition (SI) engines is thoroughly analyzed based on the spray and flame, combustion, performance, and emission characteristics of SI engines running on DMF compared with ethanol and gasoline. More interestingly, the knocking, lubrication, and wear characteristics in SI engines fueled with DMF are also evaluated and discussed. Nonetheless, further investigation on optimization strategies on DMF production process should be conducted prior to the initiation of large-scale commercialization as well as the application of DMF to real-world SI engines.

31 citations

Journal ArticleDOI
TL;DR: In this paper , the effect of hydrogen HMI, HPI and EGR on the combustion and emission characteristics of CRDI diesel engine operated on dual-fuel mode using DiSOME and PG combination is evaluated.

23 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a novel autothermal-equilibrium metal hydride reactor as the hydrogen source for the fuel cell power system, which employs phase change material (PCM) to recycle the hydrogen storage heat.

20 citations

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TL;DR: In this paper , a review of the potential of alcohol utilization in the form of blend or under dual-fuel combustion modes, as well as neat alcohol-fueled CI engine is presented.
Abstract: ABSTRACT Alcohol fuels, primarily ethanol and methanol, have emerged as one of the important alternatives for sustainable transportation and power generation applications, due to the overall lower carbon dioxide (CO2) emissions. The higher octane number of alcohol makes it suitable for spark ignition (SI) engines while lower blend ratios can be used for compression ignition (CI) engines as well. Since significant work and exploration have already been performed for the application of alcohol in SI engines, the present study is primarily focused on alcohol utilization in CI engines. This review majorly consists of three parts: first, a discussion on the physical and chemical properties of ethanol and methanol from the fuel perspective, second, combustion, and engine performance of CI engines fueled with alcohol and lastly, emissions characterization of alcohol as fuel. A summary of this review is provided which highlights the potential of alcohol utilization in the form of blend or under dual-fuel combustion modes, as well as neat alcohol fueled CI engine. Alcohol-fueled CI engine improves the soot-NOx trade-off characteristic in comparison to conventional diesel combustion, this fuel could be an enabler to meet future emissions regulations. Overall lower CO2 emissions (up to 15% lower compared to diesel) by utilizing alcohol as fuel make it suitable for sustainable transportation.

18 citations