Master Degree / Yüksek Lisans Tezleri

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

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Author: search.filters.author.Bilir, LeventLanguage: search.filters.language.en

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  • Master Thesis
    Modeling and Analysis of Heat Pump Integrated Pv-Wind Systems for a Commercial Greenhouse
    (01. Izmir Institute of Technology, 2023) Özcan, Zeynep; Çağlar, Başar; Bilir, Levent
    This thesis focuses on modeling and simulating renewable energy (RE) systems that include photovoltaic (PV) panels, wind turbines (WT), and air source heat pumps (HP) for meeting the heating load of a commercial greenhouse (GH) in the agricultural zone in Dikili. Five different energy systems scenarios, namely (i) PV-HP, (ii) PV-WT-HP, (iii) WT-PV-HP, (iv) WT-HP, and (v) only HP were considered. For all scenarios the mismatch between the load and the generation was covered by grid. The second and third scenarios differ from each other based on the number of PVs and WTs. The design of the greenhouse was made with SketchUp and TRNSYS software based on dimensions of the greenhouse. According to the weather data and greenhouse parameters, solar radiation calculations were made, and the greenhouse system was modeled by MATLAB software. The annual heating and cooling demands of the designed greenhouse and electricity generation by PVs and WTs were calculated on an hourly basis. The heating and cooling loads were found to be 5,922,015 and 11,014,446 kWh/year, respectively. Since the maximum power output by RE for the reserved area is not sufficient to meet the cooling load, the cooling process was excluded. Economic and environmental analyzes were made. The first scenario including 5,271 PV panels and 20 HPs was found to be the best scenario. Net Present Value (NPV), Levelized Cost of Energy (LCOE) and CO2 savings of the related scenario were calculated as $547,440.40, 0.080146 $/kWh and 1,270.96 t.
  • 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, Zafer
    This 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.