Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Mar 15, 2019
Distribution of electrical energy is important. Particularly during the management of power trans... more Distribution of electrical energy is important. Particularly during the management of power transmission networks, many critical systems enter the circuit and perform important functions. One of the most important of these is the high-voltage switching process, known as switch-mode operation. One of the problems that switching mechanism meets when performing its function is heat accumulation. It is imperative to examine the thermal design and consider design considerations under limited volume and special conditions. In this closed volume, the temperature values produced by these elements were experimentally measured at certain points and then these values were compared with the 3D finite volume based CFD determined values. This comparison demonstrates that the design could be based on CFD analysis values in terms of temperature appearance. This is a valuable contribution for cost minimization and optimal system design approach.
Ince kesitli kanallardaki akiskan akiminin dogru analiz edilmesi endustriyel acidan oldukca onem ... more Ince kesitli kanallardaki akiskan akiminin dogru analiz edilmesi endustriyel acidan oldukca onem tasimaktadir. Boyle bir kanal icerisindeki akiskan akiminin analizini uc-boyutlu olarak yapmak en dogru sonucu verecektir. Ancak boyle bir modeli uc-boyutlu incelemek genellikle cok karmasik ve guctur. Dolayisiyla bu analizin sonuclarini elde etmek icin ihtiyac duyulan bilgisayar gucu ve zamani cok pahali olacaktir. Boyle bir model, bazi kabuller yapilarak mumkun mertebe basitlestirilmelidir ya da iki-boyuta indirgenmelidir. Bu calismada, Navier-Stokes denklemleri uc-boyutlu yerine ucuncu boyut olan z-dogrultusunda kanalin h kalinligi boyunca entegrali alinarak 2(1/2) - boyuta indirgenerek yeniden duzenlenmistir. Bu, hesaplamada belirli bir tasarrufu Saglar, ornegin [u,v,w] gibi uzaysal hiz bilesenlerinden biri indirgenerek [u,v]seklinde duzleinsel ortalama hizlara donusur. Bu duzenlemede parabohk ve duz olmak uzere iki farkli hiz profili kullanilarak iki degisik formulasyon elde edilmi...
Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2019
Distribution of electrical energy is important. Particularly during the management of power trans... more Distribution of electrical energy is important. Particularly during the management of power transmission networks, many critical systems enter the circuit and perform important functions. One of the most important of these is the high-voltage switching process, known as switch-mode operation. One of the problems that switching mechanism meets when performing its function is heat accumulation. It is imperative to examine the thermal design and consider design considerations under limited volume and special conditions. In this closed volume, the temperature values produced by these elements were experimentally measured at certain points and then these values were compared with the 3D finite volume based CFD determined values. This comparison demonstrates that the design could be based on CFD analysis values in terms of temperature appearance. This is a valuable contribution for cost minimization and optimal system design approach.
Air knives with very different nominal values are used for various purposes in the industry. The ... more Air knives with very different nominal values are used for various purposes in the industry. The uses of air knives include the painting and coating stages of automobile semi-finished products, as well as many stages related to food production. One of the important sectors among these is the continuous hot-dip galvanizing process, which is a coating technique in the steel industry. In addition, the chemical coating process on paper as a very thin layer is another research topic. The most critical process needed in these sectors is to ensure a homogeneous air-flow at the expected air speed of the air-knife. These determine whether the coating on the steel or the chemical layer on the paper is homogeneous at the desired thickness. In this study, it is aimed that the air-knife can reach the expected values (speed and homogeneous distribution) with the expected tolerances, the shortest time, cost, and the least production process error. First, a design has been made so that this knife c...
Producing pyrolytic oil via pyrolysis reaction from waste papers containing melamine formaldehyde... more Producing pyrolytic oil via pyrolysis reaction from waste papers containing melamine formaldehyde and urea formaldehyde, which have an economic and environmental value, is the base of this study. In this study gas, liquid and solid products were gained via pyrolysis, and liquid products are put into perspective from the point of energy. In this pilot study, positive results were obtained for comprehensive further experiments, and it?s seen that the results may have meaningful value on sectoral basis with regards to reducing environmental damages of the wastes and energy producing.
Many industrial products work under different constraints. Examples of these products include tra... more Many industrial products work under different constraints. Examples of these products include transformers and keeping them in certain operating temperatures is an important design constraint. However, since power transformers have different requirements, there are no standard products. For this reason, it is difficult and costly to test each one by considering these constraints and to design them accordingly. Satisfactory thermal analysis using a 3-D finite volume-based CFD model is an important step to understand natural convection and necessary design modifications under the desired conditions. The aim of this study is to verify the performance and reliability of the design by comparing the experimental results with 3-D finite volume analysis results by considering cooling of a dry resin type transformer with a cabin. The effect of the cabin on the product in terms of natural heat convection is also evaluate
2005 6th International Conference on Information Technology Based Higher Education and Training, 2005
Employing a recent graduate engineer without any work experience in industry is quite difficult, ... more Employing a recent graduate engineer without any work experience in industry is quite difficult, because, generally, they do not have any clear goal to reach in their professional career. This problem appears more dominantly in multidisciplinary engineering fields. First part of this study elaborates on industry expectations from multidisciplinary engineers. The second part offers a new sandwich program structure for
Energy resources are an irreplaceable life resource in the current world, with the use and manage... more Energy resources are an irreplaceable life resource in the current world, with the use and management of these an important indicator of development. In parallel to the developing world economy, the increase in the use of energy resources is increasingly consuming existing fossil sources and also increasing the amount of greenhouse gas released into the atmosphere. As a result of resulting material and environmental concerns, renewable energy resources have begun to be used as alternative energy resources. These resources have advantages such as sustainability and environmental friendliness, in addition to having disadvantages such as higher investment costs and also system reliability is insufficient to provide for continuous demand for energy. To resolve these disadvantages, hybrid systems have been developed involving the use of more than one type of renewable energy resource and/or use with traditional energy resources and/or integration with storage systems. The use of these systems requires finding the solution to optimization problems including one or more objectives such as sizing the system to minimize energy costs, system management to balance the uncertainty of energy produced or reduction of greenhouse gas emissions. This article was prepared with the aim of investigating optimization techniques developed from past to present to solve this problem and especially to determine the efficacy of multi-objective optimization approaches.
Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Mar 15, 2019
Distribution of electrical energy is important. Particularly during the management of power trans... more Distribution of electrical energy is important. Particularly during the management of power transmission networks, many critical systems enter the circuit and perform important functions. One of the most important of these is the high-voltage switching process, known as switch-mode operation. One of the problems that switching mechanism meets when performing its function is heat accumulation. It is imperative to examine the thermal design and consider design considerations under limited volume and special conditions. In this closed volume, the temperature values produced by these elements were experimentally measured at certain points and then these values were compared with the 3D finite volume based CFD determined values. This comparison demonstrates that the design could be based on CFD analysis values in terms of temperature appearance. This is a valuable contribution for cost minimization and optimal system design approach.
Ince kesitli kanallardaki akiskan akiminin dogru analiz edilmesi endustriyel acidan oldukca onem ... more Ince kesitli kanallardaki akiskan akiminin dogru analiz edilmesi endustriyel acidan oldukca onem tasimaktadir. Boyle bir kanal icerisindeki akiskan akiminin analizini uc-boyutlu olarak yapmak en dogru sonucu verecektir. Ancak boyle bir modeli uc-boyutlu incelemek genellikle cok karmasik ve guctur. Dolayisiyla bu analizin sonuclarini elde etmek icin ihtiyac duyulan bilgisayar gucu ve zamani cok pahali olacaktir. Boyle bir model, bazi kabuller yapilarak mumkun mertebe basitlestirilmelidir ya da iki-boyuta indirgenmelidir. Bu calismada, Navier-Stokes denklemleri uc-boyutlu yerine ucuncu boyut olan z-dogrultusunda kanalin h kalinligi boyunca entegrali alinarak 2(1/2) - boyuta indirgenerek yeniden duzenlenmistir. Bu, hesaplamada belirli bir tasarrufu Saglar, ornegin [u,v,w] gibi uzaysal hiz bilesenlerinden biri indirgenerek [u,v]seklinde duzleinsel ortalama hizlara donusur. Bu duzenlemede parabohk ve duz olmak uzere iki farkli hiz profili kullanilarak iki degisik formulasyon elde edilmi...
Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2019
Distribution of electrical energy is important. Particularly during the management of power trans... more Distribution of electrical energy is important. Particularly during the management of power transmission networks, many critical systems enter the circuit and perform important functions. One of the most important of these is the high-voltage switching process, known as switch-mode operation. One of the problems that switching mechanism meets when performing its function is heat accumulation. It is imperative to examine the thermal design and consider design considerations under limited volume and special conditions. In this closed volume, the temperature values produced by these elements were experimentally measured at certain points and then these values were compared with the 3D finite volume based CFD determined values. This comparison demonstrates that the design could be based on CFD analysis values in terms of temperature appearance. This is a valuable contribution for cost minimization and optimal system design approach.
Air knives with very different nominal values are used for various purposes in the industry. The ... more Air knives with very different nominal values are used for various purposes in the industry. The uses of air knives include the painting and coating stages of automobile semi-finished products, as well as many stages related to food production. One of the important sectors among these is the continuous hot-dip galvanizing process, which is a coating technique in the steel industry. In addition, the chemical coating process on paper as a very thin layer is another research topic. The most critical process needed in these sectors is to ensure a homogeneous air-flow at the expected air speed of the air-knife. These determine whether the coating on the steel or the chemical layer on the paper is homogeneous at the desired thickness. In this study, it is aimed that the air-knife can reach the expected values (speed and homogeneous distribution) with the expected tolerances, the shortest time, cost, and the least production process error. First, a design has been made so that this knife c...
Producing pyrolytic oil via pyrolysis reaction from waste papers containing melamine formaldehyde... more Producing pyrolytic oil via pyrolysis reaction from waste papers containing melamine formaldehyde and urea formaldehyde, which have an economic and environmental value, is the base of this study. In this study gas, liquid and solid products were gained via pyrolysis, and liquid products are put into perspective from the point of energy. In this pilot study, positive results were obtained for comprehensive further experiments, and it?s seen that the results may have meaningful value on sectoral basis with regards to reducing environmental damages of the wastes and energy producing.
Many industrial products work under different constraints. Examples of these products include tra... more Many industrial products work under different constraints. Examples of these products include transformers and keeping them in certain operating temperatures is an important design constraint. However, since power transformers have different requirements, there are no standard products. For this reason, it is difficult and costly to test each one by considering these constraints and to design them accordingly. Satisfactory thermal analysis using a 3-D finite volume-based CFD model is an important step to understand natural convection and necessary design modifications under the desired conditions. The aim of this study is to verify the performance and reliability of the design by comparing the experimental results with 3-D finite volume analysis results by considering cooling of a dry resin type transformer with a cabin. The effect of the cabin on the product in terms of natural heat convection is also evaluate
2005 6th International Conference on Information Technology Based Higher Education and Training, 2005
Employing a recent graduate engineer without any work experience in industry is quite difficult, ... more Employing a recent graduate engineer without any work experience in industry is quite difficult, because, generally, they do not have any clear goal to reach in their professional career. This problem appears more dominantly in multidisciplinary engineering fields. First part of this study elaborates on industry expectations from multidisciplinary engineers. The second part offers a new sandwich program structure for
Energy resources are an irreplaceable life resource in the current world, with the use and manage... more Energy resources are an irreplaceable life resource in the current world, with the use and management of these an important indicator of development. In parallel to the developing world economy, the increase in the use of energy resources is increasingly consuming existing fossil sources and also increasing the amount of greenhouse gas released into the atmosphere. As a result of resulting material and environmental concerns, renewable energy resources have begun to be used as alternative energy resources. These resources have advantages such as sustainability and environmental friendliness, in addition to having disadvantages such as higher investment costs and also system reliability is insufficient to provide for continuous demand for energy. To resolve these disadvantages, hybrid systems have been developed involving the use of more than one type of renewable energy resource and/or use with traditional energy resources and/or integration with storage systems. The use of these systems requires finding the solution to optimization problems including one or more objectives such as sizing the system to minimize energy costs, system management to balance the uncertainty of energy produced or reduction of greenhouse gas emissions. This article was prepared with the aim of investigating optimization techniques developed from past to present to solve this problem and especially to determine the efficacy of multi-objective optimization approaches.
Uploads
Papers by Gulsen Yaman