Zeki Yilmazoglu

Zeki Yilmazoglu
Gazi University · Department of Mechanical Engineering

About

45
Publications
5,253
Reads
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326
Citations
Introduction
HVAC systems, Plasma applications, Energy management, Thermoelectric devices, Thermal Power Plants, Sustainability, and Air vehicles

Publications

Publications (45)
Article
Hydrogen and hydrogen-related technologies will have an important role in world energy projection in the near future. Interest in hydrogen technologies will also increase, especially due to the smart cities concept and the increase in renewable energy supply. In addition to being a clean energy source, the tendency of hydrogen to 100% renewable ene...
Article
Repowering of worn-out coal-fired power plants is an alternative regarding costs and efficiency due to both increased installed capacity and reduced emissions per installed power. The exergy approach in examining repowering alternatives can provide data for designers and operators in the identification and comparison of losses. In this study, hot w...
Conference Paper
Full-text available
This study was carried out to meet the domestic hot water need of Gazi University Hospital with vacuum tube solar collectors. Natural gas is used for hot water heating in the hospital. Accordingly, the use of natural gas stands out with both its cost and carbon dioxide emission. Global warming has been causing the world with many countries to reduc...
Article
In terms of infection control in hospitals, especially the Covid-19 pandemic that we are living in, it has revealed the necessity of proper disposal of medical waste. The increasing amount of medical waste with the pandemic is straining the capacity of incineration facilities or storage areas. Converting this waste to energy with gasification techn...
Article
In this paper, a 3D numerical simulation of a downdraft plasma gasifier with plasma reactions is conducted. The effects of the equivalence ratio (ER) on the syngas properties in the presence of the plasma reactions are investigated. The boundary conditions for the air plasma inlet of the gasifier are obtained from the outlet of a 10 kW microwave pl...
Article
Full-text available
In this study, a far-off local zone telecommunication infrastructure container ventilation system with cabinets is modelled. CFD analysis is performed to obtain the temperature and velocity profile inside the container with given heat loads and volume flow rates provided by fans. In the second part of the study, performance improvement scenarios ar...
Article
Full-text available
This paper aims to draw a general picture of the simplified software for calculation building energy performance based on Turkish Regulations called BEP-tr.v2, which was released at the end of 2017. Even the tool has a simplified calculation methodology, the discussion in this paper is going to be focused on assessing the accuracy of the tool by te...
Article
Full-text available
Existing buildings require optimization of the individual heating systems to decrease the energy consumption or energy use intensity (EUI) with heat recovery systems to maintain the sustainability. In terms of energy use intensity, hospitals are considered as the second highest EUI among diverse types of buildings. Therefore, to decrease energy use...
Article
Olive mill wastewater is an industrial waste, generated as a byproduct of olive oil production process and generally contains components such as organic matter, suspended solids, oil, and grease. Although various methods have been developed to achieve the disposal of this industrial wastewater, due to the low cost, the most common disposal applicat...
Article
The use of electronic components is increasing day by day, and cooling of these components to work properly is an important task for researchers. However, many small enterprises do not have any involvement in the design of the finned surfaces used to remove heat from electronic circuits. As a result, electronic card faults are frequently encountere...
Article
Full-text available
In this study, an application of an Organic Rankine Cycle (ORC) in a natural gas compression station in Erzincan region is presented. Natural gas compression station (NGCS) uses a gas turbine to pressurize the natural gas for transportation. Waste heat of gas turbine can be utilized by an ORC which uses n-pentane as working fluid to generate electr...
Article
Energy audit of a school building was carried out to evaluate the effects of the building retrofitting on energy efficiency and carbon footprint. Lighting intensities of the selected areas in the building were measured and thermal images of the building envelope were compared before and after retrofitting. Combustion performance of the boilers was...
Chapter
In recent years, flow control methods on an airfoil have gained interest. Flow control methods can be classified as passive and active control systems. Dielectric barrier discharge (DBD) plasma actuator is an active control method. A DBD plasma actuator can be defined as; a flow control device, without moving parts and same airfoil shape after inst...
Article
Gasification, a method of producing hydrogen, is an alternative way to obtain clean, sustainable, and domestic energy using coal and biomass resources. Gasification can be achieved with several methods or using various reactor designs, and plasma gasification is one of these methods. Plasma gasification has advantages compared to conventional gasif...
Chapter
In this study, thermal repowering alternatives were compared in terms of net installed power, net electrical efficiency, emissions, and unit electricity generation costs. Soma A thermal power plant with 2 × 22 MWe capacity, was simulated in Thermoflex with design parameters. Three different repowering alternatives were simulated to compare the resu...
Article
In this study, numerical analyses of repowering of a thermal power plant boiler using plasma combustion systems were performed. In order to reduce the energy consumption of the power plant, fuel-oil burners were disassembled and plasma combustion systems were installed on the surfaces of the boiler. The integration procedure, design data, and bound...
Article
Renewable electricity generation systems have an increasing trend in terms of usage due to aiming to decrease greenhouse gas emissions and energy source diversification strategies of countries. Parabolic trough, Fresnel, and solar tower systems have been used to generate solar thermal electricity around the world. In this study, the effects of the...
Article
In this study, numerical analyses of repowering of a thermal power plant boiler using plasma combustion systems were performed. In order to reduce the energy consumption of the power plant, fuel-oil burners were disassembled and plasma combustion systems were installed on the surfaces of the boiler. The integration procedure, design data, and bound...
Article
In this study, the performance of a prototype thermoelectric heating/cooling unit is investigated. In the numerical analysis, temperature–pressure contours, and velocity vectors are obtained for the selected fin geometry. In order to validate the numerical results, experimental analyses are carried out. The effects of the air velocity on the temper...
Article
In this study, thermoelectric generator (TEG) adaptation in a condensing combi boiler was investigated. The first part of the study comprises experimental analysis, performance tests of a commercially available TEG, and efficiency tests of a condensing combi boiler without TEG adaptation. In the second part of the study, a numerical analysis was ca...
Article
Full-text available
Utilizing compressors, natural gas compression stations (NGCS) supply the required pressure to transport the natural gas in pipelines. This study proposes to utilize the waste heat of gas turbines (GT), employed in these stations, to produce shaft power for compressors. A NGCS coupled to an Organic Rankine Cycle (ORC) is simulated by THERMOFLEX in...
Conference Paper
Full-text available
In this study, thermoelectric generator (TEG) application in a condensing combi boiler was investigated. In the first part performance tests of commercial TEGs were performed. An electric resistance was used to model the heat source for hot side of TEG. For heat sink side water is circulated in a closed system, which enables constant water temperat...
Article
In this paper, energy and exergy analyses are carried out for a double effect series flow type absorption cooling system with different high temperature generator (HTG) pressures. In the cases, the pressure of HTG is selected as 100, 70 and 50 kPa respectively. Thermal loads of each component, mass flowrates of each stream, coefficient of performan...
Article
In this study, exergy analysis of an integrated gasification combined cycle (IGCC) operating with 7 different types of low rank Turkish lignite was performed. The purpose was to determine and compare the performance of each type of lignite in the same gasifier. Exergy destruction of each component and exergetic performance of the overall plant was...
Article
The repowering of thermal power plants could be the fastest way to respond to the energy demand while decreasing the CO2 emissions per kilowatt hour of energy generated. Hot windbox repowering of a thermal power plant was investigated in this study using Thermoflex simulations. The Soma A thermal power plant began operation in 1957 and was in servi...
Article
Integrated gasification combined cycle (IGCC) power plants have become more attractive after the emission regulations of the thermal power plants. IGCC power plants enable to control emissions which cause global warming. Low grade lignites, biomass and wastes can be utilized by this technology. This study deals with the thermodynamic analysis of an...
Article
In this study a solar driven absorption cooling system is offered for a hotel. Solar energy is only used in absorption chiller. The payback time of the offered system with different scenarios are investigated. Solar collectors and absorption chiller price are the main contributors to the total system price. The effects of the unit prices of the abs...
Article
Abstract- In this study, a solar assisted rotary coal dryer is analyzed in terms of exergy economy and environment (3E). In the analysis two different heat sources are utilized. In the first one, a natural gas burner is used for producing the required heat for coal drying. In the second one, a parabolic solar system is employed as a heat source for...
Article
The purpose of this study is to design a 240 MWel thermal power plant (TPP) to be operated with ten different types of Turkish lignite and fulfill an exergy analysis including the determination and comparison of the performance for each type of lignite. Additionally an examination of the effect of the ambient temperature on the power plant's exergy...
Article
In this study, exergy and sensitivity analysis of a combined cycle gas turbine (CCGT) power plant in Ankara, Turkey, is performed with real plant data sets. Exergy efficiency of each component and overall plant is determined by calculating exergy destructions. In addition, a sensitivity analysis is carried out by changing some critical parameters o...
Article
Combined cycle power plants consist of a gas cycle, which uses gas turbines to generate electricity, and a water–steam cycle, which uses steam turbines to generate electricity. In gas turbine power plants, operation performance is the function of ambient air temperature, pressure, and humidity. Electricity consumption increases in summer seasons du...
Article
Gas turbine power plants, when compared to other power plants, due to their low investment cost, fast load change characteristic, low installation time and releasing low harmful emissions with respect to coal fired power plants, in our country, especially with the support of private sector, were established and currently operate. According to 2030...
Article
In this study, the thermodynamic analysis is carried out for a single effect, LiBr-H(2)O working fluid pair, solar assisted absorption cooling system. Absorption cooling systems consumes less electricity rather than vapor compression systems. Due to this property, absorption cooling systems have a vital importance for energy sustainability. It is e...

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