Department of Mechanical Engineering
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Browsing Department of Mechanical Engineering by Author "DEVRİM, Yılser"
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Item ANALYSIS OF GREEN HYDROGEN PRODUCTION USING SOLAR DISH STIRLING SYSTEM IN ANKARA REGION(2023-01-27) TROSTER, Frederick Can; DEVRİM, YılserThe world's energy demand is growing in parallel with the world's population and economy. In today's world, fossil fuels provide most of the electricity. By damaging the environment, the usage of fossil fuels endangers our future. Renewable energy sources are becoming more popular as technology advances. These eco-friendly supplies are critical for our future. Renewable energy is defined as energy derived from natural sources such as solar, wind, and geothermal. The sun is the most basic source of energy. Many systems have been developed to generate energy from the sun. Concentrated solar energy systems are becoming increasingly popular for generating solar energy. One of the concentrated systems, Solar Dish Stirling technology, attracts attention due to its great efficiency. This system, consisting of a dish with a mirror, a receiver, and a motor, can convert solar energy to electrical energy with 32% efficiency. Energy storage, in addition to energy generation, is critical for our future. One of the energy storage strategies, hydrogen production, looks promising for the future. The energy source used in hydrogen production is categorized. Green hydrogen is hydrogen produced using ecologically friendly, renewable energy sources. This zero-emission manufacturing approach is increasing in popularity. An electrolyzer is used in the generation of hydrogen. The water is split into hydrogen and oxygen by the electrolyzer. The separated hydrogen can be compressed with the help of a compressor and stored for later use. Green hydrogen production simulation in the Ankara region was investigated in this study using Solar Dish Stirling, one of the concentrated solar energy technologies. Solar Dish Stirling, PEM water electrolyzer, hydrogen compressor, and hydrogen tank for storage are all part of the system. The electrolyzer was powered by electricity generated by the Ripasso dish Stirling system. The offsetting approach has been implemented in the system. When there is insufficient radiation, but the total daily electricity generation is sufficient to run the electrolyzer, the electrolyzer and compressor are activated, and hydrogen production begins. The system can create more electricity and hydrogen in the summer than in the winter. The LCOE value was found 0.4595 $/kWh and compared to international values. Following the offset, strategy provides an advantage for the cost of the system. The system has a capacity of 47950 kW/h per year and can produce 377 kilograms of hydrogen per year. These systems are critical for our future. It will be a good solution to environmental challenges with growing technology and reduced investment costs.Item MODELLING, SIMULATION AND DESIGN OF A GREEN HYDROGEN BASED HYBRID ENERGY SYSTEM(2022-03-01) Özkök, Duygu; DEVRİM, YılserAs global warming increases and fossil fuel sources are depleted, renewable energy sources gain importance. Clean energy sources such as sunlight, wind, geothermal energies, and hydro energies constitute renewable energy sources. The fact that the sun and wind are endless sources makes renewable energy more important day by day. In addition, reducing foreign dependency increases the importance of renewable energy sources even more. Turkey has a very productive position in terms of both solar radiation and wind potential. This makes electricity generation from solar and wind energy even more important. However, the current high initial costs and low energy conversion efficiencies of renewable energy sources reduce the availability of renewable energy. Failure to produce electricity from solar energy in the evening also leads to blackouts. Therefore, the integration of solar and wind energy systems is used as complementary systems. The use of two or more renewable energy sources together is called hybrid systems. Rather than using a single renewable energy source, the use of a hybrid system is more advantageous in terms of both cost and efficiency. The system established in solar-wind energy integration can solve the problem of intermittent electricity that may occur from the sources installed as a single system. The fact that the sun produces electricity during the daytime and the wind produces electricity in the evening provides complementary features. Another problem that can be encountered in renewable energy sources is storage. As is known, batteries used in solar energy do not store seasonally. This shows that the electricity produced in excess cannot be used. Therefore, hydrogen energy comes into play as an alternative energy source. Storage of energy in the form of hydrogen (H2) provides solutions for both daily and seasonal storage. With the help of the electrolyzer, water molecules are decomposed into hydrogen (H2) and oxygen (O2) and stored as H2 and O2 in high pressure tanks. Fuel cells are also a source that converts the chemical energy created by hydrogen into electrical energy in this system. Fuel cells integrated into the solar wind system are also an alternative solution in terms of increasing energy conversion. There are six types of fuel cells. Among them, the proton exchange membrane fuel cell (PEMFC) is the most attractive due to its quiet operation and lower corrosion, high power density, low local emissions, low operating temperatures. Therefore, they can be powered by a PEMFC for hybrid systems with photovoltaic panels and wind turbines. The most important process in the studies of renewable energy sources is the simulation steps. This thesis study was carried out to meet the 25 kW electricity needs of Ankara Atilim University from hybrid systems without being connected to the grid. To solve the system storage problem, hydrogen energy and, accordingly, the fuel cell were designed. The Proton Exchange Membrane Fuel cell design, which will operate for 5 hours a day, was designed through the MATLAB program and integrated into the TRNSYS software program. System simulation was done using the TRNSYS program. The optimum number of panels was determined according to a fixed number of selected wind turbines for the operation of the electrolyzer. Finally, the leveled cost calculations were calculated, and the optimum system was selected.