İlken, Zafer
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Ilken, Z.
Ilken, Zafer
İlken, Z.
Ilken, Zafer
İlken, Z.
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Main Affiliation
03.10. Department of Mechanical Engineering
Status
Former 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
0
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4QUALITY EDUCATION
0
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
1
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7AFFORDABLE AND CLEAN ENERGY
4
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8DECENT WORK AND ECONOMIC GROWTH
1
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
5
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
0
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
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13CLIMATE ACTION
1
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14LIFE BELOW WATER
0
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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
14
Citations
468
h-index
6
This researcher does not have a WoS ID.
Scholarly Output
15
Articles
5
Views / Downloads
11579/7584
Supervised MSc Theses
6
Supervised PhD Theses
2
WoS Citation Count
365
Scopus Citation Count
434
Patents
0
Projects
0
WoS Citations per Publication
24.33
Scopus Citations per Publication
28.93
Open Access Source
15
Supervised Theses
8
| Journal | Count |
|---|---|
| Applied Thermal Engineering | 3 |
| Internationales Symposium - Warmeaustausch und Erneuerbare Energiequellen | 1 |
| International Journal of Energy Research | 1 |
| International Journal of Thermal Sciences | 1 |
| Journal of Enhanced Heat Transfer | 1 |
Current Page: 1 / 1
Scopus Quartile Distribution
Competency Cloud
15 results
Scholarly Output Search Results
Now showing 1 - 10 of 15
Conference Object Si-Geothermometry Applied for the Interpretation of Three-Components Mixtures in Marine Geothermal Systems -Exploration of the Gülbahce Geothermal Field, Western Anatolia/ Turkey(Wydawnictwo Uczelniane Politechniki Szczecinskiej, 2000) Giese, L.B.; İlken, Zafer; Çetiner, Levent; Yıldırım, NazımThe geothermal field of Gülbahce is located in western Anatolia/Turkey near Izmir. The University of Izmir IYTE is building-up a campus there. A pre-study was done to investigate whether the campus can be supplied with geothermal heat. Based on hydrogeochemical data, mixing calculations and a modified version of the SiO2-enthalpy diagram were applied to evaluate the reservoir temperature of three-components-mixtures. The temperature of the mixed outcrop water is 35°C. It consists of geothermal sea water, freshwater, and cold sea water. The fraction of freshwater was estimated to be 8%, The contents of Li and Si were interpreted to be generated by the reservoir temperature of 60°C in minimum - lower limit for low-temperature space heating - but to be maybe more than 100°C. This geothermal resource seems to be suitable, but exploitation will be difficult. One production well should satisfy the heat supply. Problems with scaling and corrosion are expected.Article Citation - WoS: 101Citation - Scopus: 132Effect of Geometrical Parameters on Heat Transfer and Pressure Drop Characteristics of Plate Fin and Tube Heat Exchangers(Elsevier Ltd., 2005) Erek, Aytunç; Özerdem, Barış; Bilir, Levent; İlken, ZaferIn this study, the influences of the changes in fin geometry on heat transfer and pressure drop of a plate fin and tube heat exchanger are investigated, numerically. A computational fluid dynamics (CFD) program called Fluent is used in the analysis. The segment of one tenth of fin is used in the modeling, due to symmetrical condition. The results of heat transfer, static, and total pressure drop values of ten different fins are tabulated and the normalized values of them are, also, given for the comparison of the models. The distance between fins is found to have a considerable effect on pressure drop. It is observed that placing the fin tube at downstream region affects heat transfer positively. Another important result of the study is that increasing ellipticity of the fin tube increases the heat transfer while it, also, results in an important reduction in pressure drop.Master Thesis Effect of Heat Absorbing Media on Thermal Performance of Air-Type Solar Collectors(Izmir Institute of Technology, 2005) Aydın, Kamil; İlken, Zafer; İlken, ZaferIn this study, effect of heat absorbing media on the thermal performance of airtype solar collector is studied experimentally. Experimental setup was built and tested by using the ASHRAE 93-1986 standard named .Methods of testing to determine the thermal performance of solar collectors.. Polyurethane foam is used as heat absorbing media with a porosity of 85%. In the analysis three air speeds 3 m/s, 3,5 m/s and 4 m/s are used. Data for similar days are compared with each other. Increment of the efficiency related to the polyurethane foam is presented and performance curves of our air-type solar collector are indicated. Factors, affect the performance of collector, are discussed. Using heat absorbing media enhances heat transfer surface area and this increases efficiency, but pressure drop should be taken into consideration to prevent extra pumping power. In conclusion, efficiency values about 55% for 3m/s for ambient temperatures between 35 and 38oC, 60% for 4 m/s and 48% for 3,5 m/s for ambient temperature between 28 and 32oC with polyurethane foam are obtained. On the other hand, pressure drops increase from 0,015 kPa to 0,215 kPa for 3 m/s, from 0,01 kPa to 0,32 kPa for 3,5 m/s and from 0,01 kPa to 0,385 kPa for 4 m/s.Master Thesis Resevoir Simulation of Balçova Geothermal Field(Izmir Institute of Technology, 2004) Budak, Barış; İlken, ZaferThis study investigates the geothermal reservoir of Balçova geothermal field using the program Fluent which is written for general problems of fluid flow and heat transfer in a given complex geometry. Geothermal reservoir simulation of Balçova geothermal field is made by Istanbul Technical University, Department of Petroleum and Natural Gas Engineering using the program Though2 which is written for geothermal reservoir application in 2001. The results of this study become a starting point of this thesis. Besides, the new techniques applied the geothermal field since that period, and reinjection of the geothermal fluid by the well BD-8 to the reservoir, made it necessary to remodel of the field. During the modeling study, the conceptual model of the field is developed based on technical data and advices by the Balçova Geothermal Ltd. The fault Agamemnon-I existing in the field is thought the dominated fault of the reservoir and assumed that the heated water from the aquifer is raised to the surface using that fault as a flow path. The geometry of the conceptual model of the reservoir is drawn and meshed properly using Gambit meshing program and meshed reservoir is exported and run in Fluent program under given boundary conditions and after that 3-D temperature distribution of the reservoir is obtained.Article Citation - WoS: 152Citation - Scopus: 172Experimental and Numerical Investigation of Thermal Energy Storage With a Finned Tube(John Wiley and Sons Inc., 2005) Erek, Aytunç; İlken, Zafer; Acar, Mehmet AliA latent heat thermal energy storage system using a phase change material (PCM) is an efficient way of storing or releasing a large amount of heat during melting or solidification. It has been determined that the shell-and-tube type heat exchanger is the most promising device as a latent heat system that requires high efficiency for a minimum volume. In this type of heat exchanger, the PCM fills the annular shell space around the finned tube while the heat transfer fluid flows within the tube. One of the methods used for increasing the rate of energy sto rage is to increase the heat transfer surface area by employing finned surfaces. In this study, energy storage by phase change around a radially finned tube is investigated numerically and experimentally. The solution of the system consists of the solving governing equations for the heat transfer fluid (HTF), pipe wall and phase change material. Numerical simulations are performed to investigate the effect of several fin parameters (fin spacing and fin diameter) and flow parameter (Re number and inlet temperature of HTF) and compare with experimental results. The effect of each variable on energy storage and amount of solidification are presented graphically.Master Thesis The Use of Cell Polyurethane Foams in Air-Type Solar Collectors as the Heat Absorbing Element(Izmir Institute of Technology, 2006) Değirmencioğlu, Can; İlken, ZaferAfter the energy crisis in early 1970.s, the priority of alternative energy resources is expanded. There have been many researches, to increase the efficiency of solar energy utilization systems, for domestic and industrial usage since early 1980.s up to now. In many fields air-type solar collectors are applicable. They generally used in food industry to dry agricultural products, textile industry to dry fabrics and space heating. Drying grains (wheat, barley, maize, etc.), fruits (grape, fig, apricot etc.), vegetables, tea are examples for food industry. Greenhouse heating and hospital heating to obtain fresh air are examples of space heating. These examples show that improving their performance is indispensable for commercial acceptance. In this study, the open-cell polyurethane foam as an absorber material, placed in a south facing, flat plate air-type solar collector at fixed tilt angle and effect of this material on collector efficiency has been investigated. The collector designed specially, in order to get maximum heat gain from the useful solar intensity falling on the glazing and insulated to loose minimum heat from collector case and transfer channels. Collector is tested under the regulations of ASHRAE 93-1986 standard named .Methods of Testing to Determine The Thermal Performance of Solar Collectors.. Air passing through the collector has been provided by a fan. Tests are repeated with three air speeds 1.266 m/s, 1.5825 m/s and 1.899 m/s. Maximum average efficiency is calculated on 1.5825 m/s. Maximum average temperature difference of air between inlet and outlet sections observed on 1.266 m/s. Maximum outlet temperature that we get is on the same day with maximum average temperature difference.Doctoral Thesis Simulation of the Heater Test Room Defined by En 442 Standard and Virtual Testing Og Different Type of Heaters(Izmir Institute of Technology, 2011) Erdoğmuş, Abdullah Berkan; İlken, ZaferHeat outputs of radiators are determined experimentally in specific conditions. Many standards have been developed to identify test conditions. EN442 standard specifies test room properties, temperature measurements and heat output calculations for radiators. In this study, the heat dissipation capabilities of three different panel radiators were determined by using numerical methods. The height and length of the tested radiators were 600 mm and 1000 mm, respectively. An experimental study was conducted in the standard test room in order to determine boundary conditions for computational study and verify numerical results. Tests were carried out in three different operating conditions. Twelve measurements were performed in each condition when test room reached steady state. Turbulent typed air flow in the test room and water flow inside the tested radiators were simulated. Temperature and velocity contours in virtual test room are also investigated in this study. Non uniform temperature distribution on the front surface of tested radiators was observed. It is seen that the symmetricity in velocity contours is distorted by using more complex radiator models and increasing excess temperature. The difference between experimental and computational heat output fluctuates between 0.4% and 13.6% for the simplest model, 3.4% and 11.1% for the second radiator, 4.5% and 12.9% for most complicated model investigated in this study. Good results are obtained for the excess temperature of 50oC and 60oC. For the lowest excess temperature, results are also in acceptable range. The study shows that computational methods can be applicable in the design of new heater types.Doctoral Thesis Numerical Optimization of a Finned Tube Gas To Liquid Heat Exchanger(Izmir Institute of Technology, 2009) Bilir, Levent; İlken, ZaferThe optimization of the fin and protrusion dimensions and shapes of finned tube gas to liquid heat exchangers are performed numerically in this thesis. The dimensions of a commercially available heat exchanger of a combi boiler apparatus are taken as basic dimensions and various parameters about plate fin and three different protrusions, namely balcony, winglet and imprint, are examined step by step. The study is realized within the geometrical dimension range used in actual applications. The numerical analyses of several heat exchangers are performed using Fluent CFD software. The boundary conditions used in the numerical investigation are taken from the actual operating conditions of the combi boiler heater apparatus. Firstly, the best plate fin geometry is determined. Secondly, the best protrusion dimensions are obtained. Finally, the effects of three protrusion placement on plate fin surface are examined. The fin I5B2W3 is determined as the best among the investigated fins. The use of actual operating conditions as boundary conditions and the investigation of the individual and cumulative effects of three different protrusions are the novelties of the study. In order to validate the numerical models, a comparison with a computational and experimental study performed by Wu and Tao is also made. The results of the models created for comparison purpose show good agreement with the results given by Wu and Tao. It is also observed that results obtained from the two alternatives for the modeling, one with symmetrical and the other with periodic boundary condition, are very close. According to these results, it is concluded that the numerical outcomes obtained in the present study are reliable.Master Thesis Estimation of the Total Solidification Time of a Liquid Phase Change Material Enclosed in Cylindrical and Spherical Containers(Izmir Institute of Technology, 2003) Bilir, Levent; İlken, ZaferThis study investigates the inward solidification process of a phase change material (PCM) encapsulated in a spherical and cylindrical container with a third kind of boundary condition as well as the complete solidification and complete charging time of a cool storage tank which consists of spherical containers filled with a PCM.The phase change problem inside the containers is modeled in spherical and cylindrical coordinates and solved numerically by using enthalpy method with control volume approach. Computer programs are written in Basic language to determine the dimensionless total solidification time of the PCM held in a spherical and cylindrical container. These programs are run many times by varying the affecting parameters to obtain data sets of the dimensionless total solidification time of PCM. These data sets are then used to derive correlations which express the dimensionless total solidification time of the PCM in terms of the affecting parameters by applying multiple regression analysis.Another program is written to simulate a cool storage tank with spherical containers. The complete solidification and complete charging time of the tank are calculated by using this program. A parametric study is realized for the cool storage tank by varying the design parameters and the influence of these variations on the complete solidification and complete charging time is investigated.Article Citation - WoS: 12Citation - Scopus: 16Numerical Optimization of a Fin-Tube Gas To Liquid Heat Exchanger(Elsevier Ltd., 2012) Bilir, Levent; İlken, Zafer; Erek, AytunçThe influence of plate fin, fin tube and protrusion parameters on heat transfer and pressure drop characteristics of a finned tube gas to liquid heat exchanger is examined in this study. The optimization of plate fin, fin tube and protrusion dimensions as well as protrusion locations on plate fin surface is performed numerically using a computational fluid dynamics (CFD) program named "Fluent". The dimensions of the plate fin of a commercially available combi boiler apparatus heat exchanger are taken as basic dimensions. As the first step, the best plate fin and fin tube geometry is determined. Secondly, the best dimensions for three different protrusions (balcony, winglet and imprint) and their most suitable locations on the plate fin surface are found. Finally, the cumulative effects of several combinations of these three protrusions on the plate fin surface are analyzed. The placement combinations of protrusions are decided according to the results obtained for the individual effect of each protrusion. The fin named as I5B2W3 is found to be the most efficient fin among the investigated cases. A comparison with a numerical and computational study is also performed to validate the numerical results of the present study. © 2011 Elsevier Masson SAS. All rights reserved.