Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Department: search.filters.department.Thesis (Master)--İzmir Institute of Technology, Energy Systems EngineeringSubject: search.filters.subject.Photovoltaic power systems

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Now showing 1 - 4 of 4
  • Master Thesis
    Grid-Connected Photovoltaic Systems for Fuel Stations: a Complete Techno-Economic Analysis
    (01. Izmir Institute of Technology, 2022) Ebil, Özgenç; Dindaroğlu, Burak; Ebil, Özgenç; Dindaroğlu, Burak; 01.01. Units Affiliated to the Rectorate; 03.02. Department of Chemical Engineering; 01. Izmir Institute of Technology; 03. Faculty of Engineering
    The purpose of this study, beyond being an engineering practice, is an attempt to overcome a bottleneck that has not been overcome so far with scientific methods and to use the power of science for the benefit of the environment, the public, fuel distribution companies, petrol stations and almost every part of the society. Due to rapid changes in in terms of technology, efficiency, environmental sensitivity, consumer preferences, cost structure and legal base, this study is investigating and making suggestions for oil station companies regarding on-grid photovoltaic applications. Successful management of the process depends on effective calculation including, system requirements considering local solar radiation and financials from many aspects. Considering that, many fuel station owners cannot effectively approach the technical, bureaucratic, and financial aspects of photovoltaic applications and that academic studies that will guide the interested parties in a package form are not sufficient, the importance of this study will be more clearly demonstrated. Information obtained through the literature review, applying the engineering economics models and also with a widespread field study including petrol stations, solar material supply and installation companies, health and safety company and bank. It has been tried to set a user’s manual for concerned parties both in, academia, oil & solar sector and financial system in Turkey.
  • Master Thesis
    Hydrogen Production From Water Using Solar Cells Powered Nafion Membrane Electrolyzers
    (Izmir Institute of Technology, 2007) Aksakal, Ziya Can; Şeker, Erol; Şeker, Erol; 03.02. Department of Chemical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The aims of this thesis are two folds; to construct single and multi cell proton exchange membrane electrolyzers and to evaluate the performance of these electrolyzers powered by solar panels on Iztech campus. All other parts, except the purchased membrane electrode assemblies, were designed, manufactured and assembled in our labs.In the construction of single and multiple cell proton exchange membrane electrolyzers, Nafion-117 based membrane electrode assemblies were used. Graphite bipolar plates, end plates, current collectors and gaskets were machined on institute.s computer numerical controlled lathe. In the first stage, a single cell electrolyzer with 20cm2 available electrolysis surface areas was examined with a direct current power supply by varying current density (0-500mAmp/cm2), water flow rate (0.05 to 0.5g/cm2min), and temperature (30-50oC). It was found that average cell voltage decreases from 2.18V at 30oC to 1.97V at 50oC when the current density is 500mAmp/cm2. Since cell gaskets were softened and stick to the membrane above 50oC of operating temperature, temperatures higher than 50 oC could not be tested. Five cell electrolyzer stack was constructed according to the final single cell design. It was observed that the stack could generate 388ml/min hydrogen under 500mAmp/cm2 and 10.09V of the operating condition at 41.5oC. When the stack was directly coupled with a solar array, voltage of the stack was found to vary from 7.5V to 12.5V and the current density changes from 0 to 1000mAmp/cm2 with respect to the solar radiance of the day. This results in a voltage efficiency ranging from 98.7% to 60% based on the higher heating value of hydrogen. Electrolyzer powered by solar cells can generate up to 750ml/min hydrogen and total daily production could be as high as 350L per day but weather condition greatly affects the production rate. Together with the losses inside the electrolyzer, another important energy loss is due to voltage mismatches between PV array and electrolyzer in low solar irradiance during sunrise and sunset.
  • Master Thesis
    Photovoltaic Charge Station on Garage Roofs With Passive Reflectors
    (Izmir Institute of Technology, 2000) Çantay, Aylin; Atagündüz, Gürbüz; Atagündüz, Gürbüz; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    This study involves a photovoltaic charge station which could be placed on garage roofs in order to charge the battery of an electrical car. The aim of this thesis is to design an efficient photo voltaic charge station and construction of omega type solar charge station. That's why various models were designed and calculated amount of energy. A photovoltaic charge station has 16 photovoltaic modules with dimensions 1293 mm*329 mm*34 mm. In this study five different type of solar charge stations were compared. These are, omega type solar charge station ( first type ), south facing type solar charge station with different angles ( second type ), south facing type solar charge station with fixed angles ( third type ), inverse of omega type solar charge station ( fourth type ), optimisation of south facing type solar charge station with different angles ( fifth type ). After calculating of collected solar energy, the fifth type solar charge station was chosen as the most efficient solar charge station. After these theoretical calculations, omega type solar charge station has been installed on the Electrical Engineering Department's roof. Voltages and current intensitiesof omega type solar charge station were measured from 28 June 2000 to 15 October 2000 in order to determine the solar power obtained and to compare it with the calculated values and measured data by Solar Energy Institute of Aegean University and meteorological station in Glizelyah. The results obtained are satisfactory.
  • Master Thesis
    Experiment Station To Observe the Solar Charge Station Behaviour for a Year Period
    (Izmir Institute of Technology, 2003) Tatar, Farah; Atagündüz, Gürbüz; Atagündüz, Gürbüz; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The main purpose of this project is to set-up an experiment station, which will investigate the behavior of a portable "Solar Charge Station" that charges electric or hybrid vehicles, which work at the city centers.The solar charge station is constructed on Classrooms Building in Engineering Faculty of Izmir Institute of Technology. Sixteen monocrystalline silicon photovoltaic modules having the dimensions of 1.293mx 0.329mx 0.034m and 55W power rating are used as the photovoltaic generator of the solar charge station. Modules are mounted as if they create an .Omega Shape. which gives its name to the station (Omega Type Solar Charge Station). Vertical and tilted reflectors are used to enhance the electricity generation. Generated electricity is used to charge a lead acid battery, which is protected by five solar charge regulators in order to prevent discharging and overcharging. 50 W halogen lamps working with direct current are chosen as the loads. The system is analyzed both theoretically and experimentally. Theoretical results have shown that Omega Type Solar Charge Station generates more or less steady electricity, approximately 240 MJ through a year period. The reflectors operate better in winter than in summer, theoretically. According to the stations shape, it uses less space on rooftops. Experiments have shown that efficiency of the charge station during summer is considerably high. The efficiencies calculated by using direct solar radiation on inclined surface is 31.65315%, for the experiment on 21.08.2003, 27.90379% for the experiment carried out without reflectors on 11.09.2003 and 35.70939% for the experiment carried out with optimum inclination angles for September, on 12.09.2003.Omega shape of the station and the reflectors increase the efficiency more or less 3% in Omega shape of the station and the reflectors increase the efficiency more or less 3% in cost of the station if the energy gain is considered.