Çetkin, Erdal
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Çetkin, E.
Cetkin, E
Cetkin, E.
Çetkin, E
Cetkin, Erdal
Cetkin, E
Cetkin, E.
Çetkin, E
Cetkin, Erdal
Job Title
Email Address
erdalcetkin@iyte.edu.tr
Main Affiliation
03.10. Department of Mechanical Engineering
Status
Current Staff
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WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
0
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3GOOD HEALTH AND WELL-BEING
1
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4QUALITY EDUCATION
2
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
2
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7AFFORDABLE AND CLEAN ENERGY
16
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8DECENT WORK AND ECONOMIC GROWTH
3
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
14
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
3
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
5
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13CLIMATE ACTION
8
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14LIFE BELOW WATER
3
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15LIFE ON LAND
0
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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17PARTNERSHIPS FOR THE GOALS
0
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Documents
53
Citations
998
h-index
20
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Scholarly Output
69
Articles
43
Views / Downloads
60150/22214
Supervised MSc Theses
20
Supervised PhD Theses
2
WoS Citation Count
719
Scopus Citation Count
837
Patents
0
Projects
2
WoS Citations per Publication
10.42
Scopus Citations per Publication
12.13
Open Access Source
42
Supervised Theses
22
| Journal | Count |
|---|---|
| International Journal of Heat and Mass Transfer | 7 |
| Journal of Thermal Engineering | 5 |
| Journal of Heat Transfer | 3 |
| Journal of Energy Storage | 3 |
| International Journal of Heat and Technology | 3 |
Current Page: 1 / 6
Scopus Quartile Distribution
Competency Cloud
69 results
Scholarly Output Search Results
Now showing 1 - 10 of 69
Master Thesis Investigation of Compressor Cycle Operating Point for Various Air Conditions(Izmir Institute of Technology, 2019) Yaşar, Soykan; Çetkin, Erdal; Çetkin, Erdaln this study, operating point of compression cycle for various conditions is documented with the consideration of all the equipment of vapor-compression refrigeration cycle. An algorithm which characterizes all the equipment, simulation of the cycle and enabling of the calculation of capacitive values is proposed. The algorithm includes compressor capacitive value polynomial coefficients, air and refrigerant side pressure drop and heat transfer correlations (for finned heat exchangers) which were taken from the literature to uncover the operating point and performance of each equipment in the cycle. e-Ntu and LMTD relations are discussed and proper correlations are included on the thesis. Furthermore, the mathematical models in the literature were surveyed in order to uncover circuiting analysis performed in the cycles.Article Citation - WoS: 16Citation - Scopus: 18Thermal and Electrical Characterization of an Electric Vehicle Battery Cell, an Experimental Investigation(Elsevier, 2022) Güngör, Şahin; Çetkin, Erdal; Lorente, SylvieThis paper documents the experimental characterization of a Li-ion battery cell during charging/discharging cyclic operations. The study of the battery cell is conducted in the absence of cooling aid system, and provides thermal and electrical insights. After describing the experimental set-up, the changes in temperature are presented and highlight the nonuniform distribution of the temperature on the battery cell surface. The findings indicate that the maximum temperature difference on the investigated battery cell surface may reach up to 11 C at 3C and 17 ⁰C at 5C, at the end of the discharge in the natural convection case. These changes in space come with temporal variations that are also documented. Voltage curves are provided during charging and discharging operations. The impact of the discharge rate, ambient temperature are then investigated together with the capacity fade after 500 cycles, and results showed that ventilation and low ambient temperatures allow to alleviate the battery capacity fade by 3%.Article Impact of Cooling Strategies and Cell Housing Materials on Lithium-Ion Battery Thermal Management Performance(Mdpi, 2025) Aydin, Sevgi; Çetkin, Erdal; Samancioglu, Umut Ege; Savci, Ismail Hakki; Yigit, Kadri Suleyman; Cetkin, ErdalThe transition to renewable energy sources from fossil fuels requires that the harvested energy be stored because of the intermittent nature of renewable sources. Thus, lithium-ion batteries have become a widely utilized power source in both daily life and industrial applications due to their high power output and long lifetime. In order to ensure the safe operation of these batteries at their desired power and capacities, it is crucial to implement a thermal management system (TMS) that effectively controls battery temperature. In this study, the thermal performance of a 1S14P lithium-ion battery module composed of cylindrical 18650 cells was compared for distinct cases of natural convection (no cooling), forced air convection, and phase change material (PCM) cooling. During the tests, the greatest temperatures were reached at a 2C discharge rate; the maximum module temperature reached was 55.4 degrees C under the natural convection condition, whereas forced air convection and PCM cooling reduced the maximum module temperature to 46.1 degrees C and 52.3 degrees C, respectively. In addition, contacting the battery module with an aluminum mass without using an active cooling element reduced the temperature to 53.4 degrees C. The polyamide battery housing (holder) used in the module limited the cooling performance. Thus, simulations on alternative materials document how the cooling efficiency can be increased.Article Citation - Scopus: 21Photovoltaic System Efficiency Enhancement With Thermal Management: Phase Changing Materials (pcm) With High Conductivity Inserts(ilhami Colak, 2021) Kyaligonza, S.; Çetkin, Erdal; Cetkin, E.The electrical conversion efficiency of photovoltaic cells from solar radiation heavily depends on the cell temperature. Here we propose a novel thermal management strategy to keep the cell temperature in the same order to attain maximum efficiency. The comparative study presented is based on four solar module configurations: a conventional photovoltaic module (PVT module), a conventional module with PCM layer underneath (PVT/PCM-I), a configuration where fins embedded into PCM (PVT/PCM-II), and configuration where the bottom of the PCM layer in PVT/PCM-II was cooled via convection (PVT/PCM-III). The developed 3D numerical model is solved via ANSYS software involving the solar ray tracing radiation model for incident solar radiations and a transient melting-solidification thermo-fluid model to cater for PCM phase transition. Results from the numerical model were validated via a comparison of experimentally studied results presented in the literature. After 120 minutes, results show that the conversion efficiency of PV cells becomes 16.84%, 18.65%, 18.83%, and 18.98% after 120 minutes for PVT module, PVT/PCM-I, PVT/PCM-II, and PVT/PCM-III with an inlet velocity of 3m/s, respectively. For the respective configurations, the specific electrical power per unit area produced reaches 75.30W/m2, 83.39W/m2, 84.19W/m2, and 89.42W/m2 for solar radiation of 540W/m2 and 26°C ambient temperature. Results reveal that a 5 mm increase in the fin height for PVT/PCM-II results in a 0.22% increase in efficiency while a 0.5m/s increase in the inlet velocity of the cooling air for PVT/PCM-III results in about 0.06% increase in efficiency. © 2021, ilhami Colak. All rights reserved.Article Citation - WoS: 12Citation - Scopus: 11Inverted Fins for Cooling of a Non-Uniformly Heated Domain(Yıldız Teknik Üniversitesi, 2015) Çetkin, ErdalThis paper shows that the peak temperature of a non-uniformly heated region can be decreased by embedding high-conductivity tree-shaped inserts which is in contact with a heat sink from its stem. The volume fraction of the high-conductivity material is fixed, and so is the volume of the solid region. The length scale of the solid domain is L. Inside there is a cube-shaped region with length scale of 0.1L and heat production 100 times greater than the rest of the domain. The location of this hot spot was varied to uncover how its location affects the peak temperature and the design of inverted fins, i.e. highconductivity tree-shaped inserts. The volume fraction of the high-conductivity tree was varied for number of bifurcation levels of 0, 1 and 2. This showed that increasing the number of the bifurcation levels decreases the peak temperature when the volume fraction decreases. The optimal diameter ratios and optimal bifurcation angles at the each junction level are also documented. Y-shaped trees promise smaller peak temperatures than T-shaped trees. The location of the vascular tree in the z direction also affects the peak temperature when the heat generation is non-uniform. In addition, the peak temperature is minimum when z = 0.65L even though the hot spot is located on z = 0.75L.Master Thesis Development of a Dishwasher Drying System That Utilizes Wastewater Thermal Energy and Experimental Investigation of Its Performance(01. Izmir Institute of Technology, 2024) Dalbudak, Uğur Doğan Can; Çetkin, ErdalEv tipi Bulaşık makineleri, girdi olarak elektrik ve suyu kullanarak yıkama işlemi yapan ve hane halkının konforunu arttıran ev aletlerindendir. Bir yıkama çevriminde kullanılan elektriğin 70% ile 90% değişen kısmı suyu ısıtmak için kullanılır. Yıkama sonucunda oluşan 45°C-60°C sıcaklık aralığında olabilen atık su, kullanılmadan gidere boşaltılır. Bu tezde, atık suyun ısıl enerjisinden faydalanmak amacıyla termal enerji deposu (TED) geliştirilmiştir. TED üzerine, atık su ile ısıl etkileşimde olacak şekilde ek bir hava kanalı eklenmiştir. Bu kanala bağlı fan yardımıyla dış ortamdan 23°C sıcaklık ve 55% bağıl neme sahip hava kanaldan geçerken atık su enerjisi ile ısınıp yıkama kabinine gönderilmektedir. Sıcaklığı artan havanın nem taşıma kapasitesi artmakla beraber kabine göre bağıl nemi de düşük seviyelerde olduğu için kurutma performansını iyileştirmesi sağlanmıştır. TED ile ısıl etkileşimde bulunan hava kanalında kanat yapısına bağlı olarak ısı geçişini arttırmak için kanal içerisinde 5 farklı tipte kanat yapısı tasarlanarak hesaplamalı akışkanlar dinamiği ile analizi yapılmıştır. İlk olarak kanat yapılarının akış direncini ne yönde etkiledikleri araştırılarak hava çıkış debileri karşılaştırılmıştır. Sonrasında ise, kurutma evresinindeki başlangıç koşulları ile zamana bağlı çözüm yapılarak, kanatların ısı geçişi üzerine etkileri değerlendirilmiştir. En verimli sonucu veren kanal boyu uzanan kanat tasarımı ile prototip üretilmiştir. Kurutma performansı deneyleri prototip TED ile bulaşık makinesi EN 60436 standardına göre yapılmıştır. Çıkan sonuca göre B enerji sınıfı (0.595 kWh/çevrim) olan bir Bulaşık makinesine geliştirilen TED sistemi entegre edildiğinde, A sınıfına (0.544 kWh/çevrim) ulaşılmıştır.Article Citation - WoS: 1Citation - Scopus: 1Constructal Structures With and Without High-Conductivity Inserts for Self-Cooling(International Information and Engineering Technology Association, 2016) Çetkin, ErdalHere we show how a heat generating domain can be gained self-cooling capability with embedded cooling channels and with and without high-conductivity fins. The volume of the heat generating domain is fixed, so is the overall volume of the cooling channels and high-conductivity inserts. Even though the coolant volume decreases with embedded high-conductivity fins, the peak temperature also decreases with high-conductivity inserts. The peak temperature is affected by the location, shape and complexity of the fins and the volume fraction. This paper documents how these degrees of freedoms should be changed in order to minimize peak temperature. This paper also discusses how the volume fraction affects each fin shape in order to minimize the peak temperature. This paper uncovers that the fins should be distributed non-equidistantly, and that high-conductivity material should be inserted as fins (bulks of high-conductivity materials) rather than uniform distribution in the domain. This paper concludes that the overall thermal conductance of a heat generating domain can be maximized by freely morphing the shape of the high-conductivity material. The optimal design exists for given conditions and assumptions, and this design should be morphed when conditions and assumptions change. This conclusion is in accord with the constructal law. Each optimal design for given conditions and assumptions is the constructal designArticle Gemi Sevk Gücü ve Isı Transferinin Yapısal Gelişim Teorisi ile İlişkisi(TMMOB Gemi Mühendisleri Odası, 2022) Güneş, Ümit; Çetkin, Erdal; Şahin, BahriYapısal Gelişim Teorisi 1996 yılında literatüre kazandırılmış olup tabiattaki ve mühendislikteki tasarım prensiplerini açıklar. Teori, yeryüzündeki akış sistemlerini bütüncül bir şekilde ele alır. Akışın (hareketin) olmadığı yerde çoğu zaman canlılıktan bahsetmemiz dahi mümkün olmamaktadır. Akış sistemlerinin çözümünde anahtar davranış biçimi bu sistemlerin minimum dirençli yol ile hareketini sürdürmesidir. Belli bir zaman dilimi için minimum direnç ile hareket eden sistem zaman geçtikçe kendine yeni yollar (kanallar) bulmakta ya da bazı yolları hiç kullanmayarak yönünü değiştirmektedir. Yapısal Gelişim Teorisi ise hayati öneme sahip olan akış sistemlerinin fiziksel arka planını ortaya koymaktadır. Bu makalede özellikle mühendislik çözümlerinin başında gelen akış sistemlerinin yapısı (gemilerde kurulu ana makine gücü ve ısı transferi örnekleri özelinde) ve Yapısal Gelişim Teorisi’ne göre ilişkisi araştırılmıştır. Bunun için 1085 adet petrol tankeri için DWT ile bu tankerler için gerekli olan güç ilişkisi nonlineer regresyon ile analiz edilmiştir. Sonuç olarak gemilerdeki genel gelişimin ve ısı transferinin yapısal gelişim prensiplerine uygun şekilde gerçekleştiği gösterilmiştir.Master Thesis Hydraulic Design Optimization and Performance Evaluation for a Dishwasher(Izmir Institute of Technology, 2019) Erik, Ömer Berhan; Çetkin, ErdalHydraulic designs of dishwashers with 12 (2 baskets) and 15 (3 baskets) place settings with diverter which distributes the water to bottom and upper spray arms separately were analyzed. First, both hydraulic systems were modeled analytically, so continuous and local losses were calculated based on them. Besides, operating point of systems were determined based on the curve of the pump and head loss. All parameters were also verified by experimental tests. An asynchronous circulation pump (fixed pump rpm and outlet pressure) with the same hydraulic outlet pressure is used in both products. Hydraulic design is evaluated with parameters obtained from the analytical model and then the design of equipment along the hydraulic path was improved. Once parameters improving the designs are determined, modified parts were analyzed numerically with finite volume method. The results were also validated with experimental studies. Lastly, prototype with improved design parameters was produced and installed on a dishwasher. Dishwasher performance index was calculated according to IEC standards to see the effect of new design on dishwasher washing performance. The results show that the energy requirement decreases 25% whereas performance index stays the same.Master Thesis Numerical Investigation of Y-Shaped and Csc Micromixers(01. Izmir Institute of Technology, 2022) Samancıoğlu, Umut Ege; Çetkin, Erdal; Çetkin, ErdalMicromixers are one of the key parts in microfluidic devices. Therefore, passive micromixers have become a popular research topic. In this thesis, parametric optimization of a Y-shaped micromixer with mixing chamber is documented. Design parameters are; alpha () for the angle between the two inlet angles, beta () for the angle between the z axis and one of the inlet channels and theta () for the angle between the other inlet channel, z-eccentricity (zecc) is the distance between the centerline of an inlet channel and origin of the mixing chamber along z-axis, x-eccentricity (xecc) is the distance between the intersection point of the two inlets and the origin of the mixing chamber along x-axis, ratio of the inlet and outlet channel length (L1/L2), ratio of the inlet and outlet channel diameter (D1/D2), ratio of the inlet channel length and diameter (L2/D2) and ratio of mixing chamber volume to the total volume(Vsp). = 180o - 240o range and zecc= 20m corresponds to the optimal range. Effect of each parameter on the system is discussed and the best performing 3 mixer designs are further investigated. The optimized design yields 88.16% mixing efficiency with 9244.4 Pa pressure drop when Reynolds number is 81. Furthermore, performance of this design is compared with a reference design. The comparison shows that optimized design decreases the pressure drop more than 50% for all Reynolds numbers while having a higher mixing efficiency (up to 35%) with low Reynolds numbers (0.054-3).