• Energy Research
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Today's energy production and increasing energy consumption which is mostly based on fossil fuels does not demonstrate a sustainable structure for the development of the world. Transforming the energy policies to a sustainable structure requires an increased share of renewable energy sources within total energy consumption. To that end, governments have been developing large investment plans considering environmental criteria. Within the framework of alternative financing quest of the 1980s, public-private partnership (PPP) models have been extensively used in energy production across the world, especially as a solution for financial problems. Debates on potential resources to be used for meeting the increasing energy demand take on a new significance in Turkey as well. In this context, the purpose of our study is to recommend future policies with a view to maximizing the utilization of renewable resources.

Today, providing the highest contribution to national welfare by utilizing natural energy resources in the most efficient and environmentally-conscious manner is one of the biggest targets. In this framework, the utilization of domestic renewable energy sources is crucial importance for Turkey to decrease its energy dependence on foreign supplies. Turkey has determined the target year as 2023, the 100th anniversary of the foundation of Republic, in terms of both energy and economic indicators. The share of renewable energy sources in electricity generation is at least % 30 and the planned capacity is 20 GW of installed wind power in 2023. For reaching these targets, it is important to be operated the electricity market in a proper way in terms of the electricity supply-demand balance, low costs and investments. The electricity generation from wind has a variable profile and can cause negative effects in the electricity market. It is important to offer the energy production forecasts of wind power plants to the electricity market for reducing these effects. The forecasts with high accuracy is significant for both plant owner and transmission operator. In this study, the analysis of day ahead market (GOP) which shows the importance of wind power forecast in terms of market revenue is conducted in comparison with renewable energy support mechanism (YEKDEM).

The amount of oxygen in air has been changed and the effect of oxygen amount has been numerically investigated on combustion and emission parameters of coke oven and generator gases in a model combustor. A CFD code has been used to perform numerical analysis. Combustion has been modelled by using the PDF/Mixture Fraction combustion model, standard k-epsilon turbulence model as turbulence model and P-1 radiation model as radiation model. The amount of oxygen in the air has been changed from 21 % to 30 %, 40 % and 50 %. According to the predictions, it can be readily said that the flame temperatures of the coke oven and the town gases increases under oxygen-enriched combustion conditions. Therefore, it is demonstrated that the combustion performances of the coke oven and town gases have been improved under oxygen-enriched combustion. When the results are evaluated in terms of emissions, it has been determined that CO emissions decrease while CO2 emissions increase as the air is enriched with oxygen. It has been also concluded that NOX emission levels increase under oxygen-enriched combustion conditions due to increases in flame temperatures of the coke oven and the town gases. The maximum flame temperature level has been predicted as of almost 2200 K under % O2-included air conditions just as the maximum NOX level has been also predicted as about 1500 ppm under the same conditions.

Free piston Stirling engines are structurally simple thermodynamic systems converting the heat into the reciprocating translational motion. In free piston Stirling engines mechanical and gas springs are used instead of the flywheels used in kinematic engines. In free piston Stirling engines one of the most important issues is keeping the amplitude of reciprocal motion of the displacer and piston under control. For the design of free piston Stirling engines, because of their structure, the dynamic and thermodynamic analyses are simultaneously conducted. The design and performance predictions of the engine is conducted via a dynamic-thermodynamic analysis including the masses of the dynamic components, constant of springs used in the system, hydrodynamic frictions, pressure forces exerting on the piston and displacer and damping forces caused by work transfer. In this study, via preparing a dynamic and thermodynamic simulation program, the analysis of a cold end connected gamma type free piston Stirling engine that will work in the temperature range of 350-700 K, have been performed. The working limits of the engine were predicted by means of examining the variation of power with the hot end temperature, spring constants of displacer and piston springs, rod diameter of the displacer, the working gas mass in the working volume of the engine and the damping constant due to the work transfer.