Master Degree / Yüksek Lisans Tezleri

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

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Access Right: Open AccessSubject: search.filters.subject.Energy consumption

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Now showing 1 - 5 of 5
  • Master Thesis
    Hydraulic Design Optimization and Performance Evaluation for a Dishwasher
    (Izmir Institute of Technology, 2019) Erik, Ömer Berhan; Çetkin, Erdal
    Hydraulic designs of dishwashers with 12 (2 baskets) and 15 (3 baskets) place settings with diverter which distributes the water to bottom and upper spray arms separately were analyzed. First, both hydraulic systems were modeled analytically, so continuous and local losses were calculated based on them. Besides, operating point of systems were determined based on the curve of the pump and head loss. All parameters were also verified by experimental tests. An asynchronous circulation pump (fixed pump rpm and outlet pressure) with the same hydraulic outlet pressure is used in both products. Hydraulic design is evaluated with parameters obtained from the analytical model and then the design of equipment along the hydraulic path was improved. Once parameters improving the designs are determined, modified parts were analyzed numerically with finite volume method. The results were also validated with experimental studies. Lastly, prototype with improved design parameters was produced and installed on a dishwasher. Dishwasher performance index was calculated according to IEC standards to see the effect of new design on dishwasher washing performance. The results show that the energy requirement decreases 25% whereas performance index stays the same.
  • Master Thesis
    Effect of Natural Wall Materials on Energy Consumption in Continental and Mediterranean Climates
    (Izmir Institute of Technology, 2019) Yöney, Ekin Gamze; İlal, Mustafa Emre; İlal, Mustafa Emre
    Concern on earth and other natural building materials has been increased by rise of energy shortage and environmental problems. Not only the speed, quality and standardization in the production process of natural building materials should be improved, but also energy consumption of buildings constructed with these materials should be on acceptable levels in order to expend their usage. This study investigates the relationship between natural wall materials and energy consumption on two adobe buildings from Continental and Mediterranean climates. Totally 20 different wall options, composed of adobe, vertical hollow brick, limestone, hempcrete and strawbale with 0.30- and 0.50-meter thickness without and with flax thermal insulation material are tested with different combinations of direction and climate. The digital models of case buildings in Continental and Mediterranean climates are created to examine the question of in what climate and which direction a wall material is appropriate for energy efficient design. Consequently, strawbale enables the minimum annual energy consumption both for Mediterranean and Continental climates, while adobe shows better energy performance in summer period of Continental climate. Besides, it is observed that the energy consumption for cooling in case building of Mediterranean climate is 10 times more than of Continental one for whatever material is tested. The quantitative research conducted with different natural wall materials makes it a logical choice in terms of opening the path of industrialization that is supported by the aim of this thesis.
  • Master Thesis
    Improvement of the Thermal Performance of an Aluminium Window Frame With Cfd Analysis
    (Izmir Institute of Technology, 2019) Gökçen, Gökçe; Başaran, Tahsin
    Most of the primary energy used in the world belongs to fossil fuels. Energyefficient activities are carried out in many different sectors in order to prevent the depletion of the reserves of these resources. The building sector is one of them and many different studies are being carried out to reduce the energy consumed in the buildings. Windows are the main unit of heat losses and gains in buildings. In literature, the main reasons for heat losses through windows are usually stated as glass units due to their large areas and relatively higher overall heat transfer coefficient. However, windows frames are as important as glass units because they also have higher heat transfer. Since the most commonly used material in window frames, which is aluminium, has the highest thermal conductivity value, this topic should be investigated. In this study, two different strategies are presented to improve the thermal transmittance of an aluminium frame without changing the frame geometry. The first strategy presented is the improvement of the gasket and thermal break materials in which high thermal conductivity materials are used which have a considerable impact on the thermal performance of aluminium window frames. The second strategy is to fill the cavities in aluminium profiles with polyurethane foam in order to reduce convection effects. Two dimensional CFD simulations of the aluminium window frame, modelled with information from the manufacturer, were used to investigate these improvement strategies. As a result of the study, the importance of thermal break and gasket materials used in the aluminium window frame has been seen and the thermal conductivity of these materials has a considerable effect on the thermal performance of the windows. Moreover, the polyurethane foam filled air cavities in the aluminium frame have positively affected the thermal performance of window as proposed and %29.44 improvements occurred.
  • Master Thesis
    Effectiveness in Space and Energy Utilization in Hvac System Selection
    (Izmir Institute of Technology, 2019) Elbiz, Gizem; Başaran, Tahsin
    In Turkey, energy consumption for heating constitutes an important part of the total energy consumed. The choice of heating system and the preferences in the use of related energy sources, excessive energy consumption and environmental impact cause high costs and significant area losses. A large number of parameters must be evaluated for the correct system selection. These parameters determine the installation cost of the system, heating and cooling loads during the construction period, and the environmental impact of energy consumption. This study aims to obtain the most economical and environmental friendly energy resource in a housing structure and accordingly, heating system and the system spatial value. The use of fossil fuels such as coal, fuel oil and natural gas and the geothermal energy as a renewable energy source are planned to be investigated. The analysis was carried out on how the climate conditions and economic values of the provinces of İzmir, Balıkesir, Kütahya and Ağrı, which are located in different climatic regions will be effected and where direct use of geothermal energy is concerned, will affect the results of the different system usage. Life Cycle Cost assessment was performed to investigate the relationship between the initial investment in a housing structure and the use of energy source and system selection. Geothermal energy is the best source of energy both for installation and renewal and for fuel consumption and environmental purposes. Geothermal heat exchangers selected for the source take up 36 times less space than coal boilers, and the economic reflection of this area is approximate 8000 if given the example of İzmir province. While considering the environmental impacts, CO2 emissions of geothermal energy are 15 times less than natural gas and 50 times less than coal.
  • Master Thesis
    Optimization of Hvac Control Strategies by Building Management Systems Case Study: Özdilek Shopping Center
    (Izmir Institute of Technology, 2003) Canbay, Çağlar Selçuk; Gökçen Akkurt, Gülden
    HVAC systems in buildings must be complemented with a good control scheme to maintain comfort under any load conditions. Efficient HVAC control is often the most costeffective option to improve the energy efficiency of a building. However, HVAC processes are nonlinear, and characteristics change on a seasonal basis so the effect of changing the control strategy is usually difficult to predict.Aim of this thesis is to reduce energy consumptions by defining new HVAC control strategies and tuning control loops in Ozdilek Shopping Center "OSC". To investigate the potential for energy savings and to redefine control scenarios, an energy audit was carried out in "OSC". According to these studies new strategies are implemented by the help of existing building management system "BMS" without making any investment.Performance indices were calculated and compared with the accepted standards. Then normalized performance indices are calculated to reach out a better understanding of the buildings' efficiency.