Master Degree / Yüksek Lisans Tezleri

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

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Now showing 1 - 4 of 4
  • Master Thesis
    Investigation of the Rotor Speed Impact on the Efficiency of Rotary Heat Recovery Ventilation Devices
    (Izmir Institute of Technology, 2018) Dilşen, Mustafa; Toprak, Kasım; Toksoy, Macit
    In this study, the thermal efficiency of the rotary (regenerative) heat exchanger has been experimentally investigated in a heat recovery mechanical ventilation device. Beside impact of the same variable on pressure drop of the heat exchanger has been researched. Experiments have been carried out in a laboratory which belongs to a company manufactures heat recovery ventilation devices. The rotor has been tested within a commercial ventilation device rather than being tested alone in order to realize the actual conditions. Test results have also been compared with mathematical model results calculated with respect to the equations according to the literature research. NTU (number of transfer units) method has been used to calculate the thermal efficiency by using the various relevant equations which had been previously proposed by various researchers. The efficiency equation, which had a good agreement with the experimental results, has been determined by evaluating this comparison as a conclusion. Keywords and Phrases: heat transfer, heat recovery, energy recovery, ventilation, mechanical ventilation, regenerative heat exchanger, rotary heat exchanger (rotary wheel), thermal efficiency, thermal effectiveness, pressure drop.
  • Master Thesis
    Planning and Design of a New Geothermal District Heating System of 2 X 5000 Dwellings in Balçova
    (Izmir Institute of Technology, 2005) Gülşen, Engin; Toksoy, Macit
    Conceptual planning (technical, economical and politic feasibility) of geothermal district heating systems is the most important step of these projects. In this study, a conceptual planning model developed for geothermal district heating systems is applied to the project of Balcova (Izmir) System-2 Geothermal District Heating System which is on the agenda nowadays in Balçova and the technical, economic and politic feasibilities are investigated. The city section on which the geothermal district heating system will be constructed has a maximum capacity of dwellings having an area of 391,700 m2 and 80% of them have been built and are in use. The most important parameter that affects the economics of the geothermal district heating systems is the participation ratio of the dwellings in the district. In this study different participation ratio (between 100% and 26%), participation costs (between 1250$ and 1500$) and participation periods (2 or 5 years) are considered and the monthly fixed energy charge which will make the internal rate of return ratio approximately positive values around 0% are calculated.
  • Master Thesis
    Design of Geothermal District Heating System of Universiade 2005 Athletes' Village
    (Izmir Institute of Technology, 2005) Ünerdem, Yiğit; Toksoy, Macit
    Geothermal energy, which is the Earth.s interior energy, has a broad application area for heating and energy production purposes. To develop healthy geothermal energy projects, conceptual planning study is one of the important tasks which should be done initially. Conceptual planning studies consists of technical, economical and political evaluation of the project showing that whether the project is feasible or not. In this study, conceptual planning study is applied to the Athletes. Village which has a dwelling area of 97,446 m2. The total peak demand including hot water need for this system design is 11,7 MWt. The existing heating system is fuel-firing system. A comparison between the existing system with geothermal district heating system is done by this study. The hot water at 140 C, which is planned to be extracted from new drilled wells, is first cooled down to 120 C and afterwards designed to give its energy to the closed city loop. Finally, city loop water will circulate in the buildings within the temperature range of 85 C/55 C. The economy of the system is studied for two different well locations considering different participating costs and operating costs.The monthly fixed charges which make the internal rate of return positive around 0 % is determined for the investor for different participating costs varying between $ 1250 and $ 2500. At the end, the net present worths for the payments that would be done to the heating systems are calculated for the consumers. As a result of the economic feasibility study, it is determined that geothermal district heating design would be feasible for the consumers when the same comfort conditions are considered for both of the designs.
  • Master Thesis
    Analysis of Geothermal Circuit of Balçova-Narlıdere Geothermal District Heating System
    (Izmir Institute of Technology, 2004) Bilal, Osman Yaşar; Toksoy, Macit
    The aim of this study is to determine the performance of the Balçova . Narlıdere District Heating System and to reveal the critical points. During this study, with the help of Balçova Jeotermal Company.s database, Balçova . Narlıdere Geothermal District Heating System is simulated in Pipelab Geothermal District Heating System simulation program and the pressure and temperature distributions of the system are determined. In the light of these analyses, the critical points of the Balçova . Narlıdere Geothermal District Heating System are pointed out with the possible reasons and solution alternatives are discussed. Meanwhile, with the flow meters which are assembled to two apartment buildings chosen in the system, the amount of the fluid and the energy consumed by the users are observed. The observed values are compared with the calculated values according to the outdoor temperatures.