Browsing by Author "Mert, Suha Orcun"

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Application of Electrodialysis for Recovering Sodium Carbonate and Sodium Bicarbonate From Lake Van
(desalination Publ, 2016) Mert, Suha Orcun
Sodium salts have a crucial role, both in industrial chemical processes and in daily life. In practice, sodium carbonate and sodium bicarbonate are known as soda. Soda is an important resource; in food industry as baking soda, and in chemical industry with its whitener and anti-lime properties. Lake Van is the largest lake in Turkey. It is located in eastern region and has 6billion ton soda reserve, which makes it the largest natural soda source in Turkey. In this study, the performance of electrodialysis (ED) for recovering the soda content in Lake Van is investigated. It is found that by applying ED on Lake Van water, the concentration of the soda can be increased from 14,000 up to 25,000ppm, with a single unit ED in 60min. Investigating and characterizing the ED parameters from this perspective in a deeper analysis paved the way for reducing the production time and increase in the cost efficiency of the soda industry.
Comparative Assessment and Optimization of Fuel Cells
(Pergamon-elsevier Science Ltd, 2015) Mert, Suha Orcun; Ozcelik, Zehra; Dincer, Ibrahim
In this study, a comprehensive exergoeconomic analysis and a multi-objective optimization study are performed for four different types of fuel cell systems, in order to determine their maximum power production capacities, exergy efficiencies, and minimum production costs, by use of a genetic algorithm method. The investigated fuel cell types are Polymer Electrolyte Membrane (PEMFC) and Direct Methanol (DMFC) for low temperature fuel cells, and Solid Oxide (SOFC) and Molten Carbonate (MCFC) for high temperature fuel cells. The selected fuel cell systems are modeled exergetically and exergoeconomically. After modeling, the cases are studied parametrically with various available operating conditions, such as temperature, pressure, surrounding temperature and pressure, current density, and relative humidity, using the developed computer program MULOP (Multi-Objective Optimizer). For the low temperature fuel cells it is observed that the efficiencies are in the range of 10-30% and the costs are around $3-4/kW. On the other hand, for the high temperature fuel cell systems, efficiencies are in the range of 15-45% and the costs seems to be $0.003-0.01/kW. The results show that high temperature fuel cells operate more effectively for large scale applications. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
A Complementary Study on Novel Pdauco Catalysts: Synthesis, Characterization, Direct Formic Acid Fuel Cell Application, and Exergy Analysis
(Pergamon-elsevier Science Ltd, 2018) Kivrak, Hilal; Atbas, Dilan; Alal, Orhan; Cogenli, M. Selim; Bayrakceken, Ayse; Mert, Suha Orcun; Sahin, Ozlem
At present, Pd containing (10-40 wt%) multiwall carbon nanotube (MWCNT) supported Pd monometallic, Pd:Au bimetallic, and PdAuCo trimetallic catalysts are prepared via NaBH4 reduction method to examine their formic acid electrooxidation activities and direct formic acid fuel cell performances (DFAFCs) when used as anode catalysts. These catalysts are characterized by advanced analytical techniques as N-2 adsorption and desorption, XRD, SAXS, SEM-EDX, and TEM. Electronic state of Pd changes by the addition of Au and Co. Moreover, formic acid electrooxidation activities of these catalysts measured by CV indicates that particle size changes in wide range play a major role in the formic acid electrochemical oxidation activity, ascribed the strong structure sensitivity of formic acid electrooxidation reaction. PdAuCo (80:10:10)/MWCNT catalyst displays the most significant current density increase. On the other hand, lower CO stripping peak potential obtained for PdAuCo (80:10:10)/MWCNT catalyst, attributed to the awakening of the Pd-adsorbate bond strength down to its optimum value, which favors higher electrochemical activity. DFAFCs performance tests and exergy analysis reveal that fuel cell performances increase with the addition of Au and Co which can be attributed to synergetic effect. Furthermore, temperature strongly influences the performance of formic acid fuel cell. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Economic Impact of Exergy Efficient Building Block Design
(int Journal Contemporary Economics & Administrative Sciences, 2017) Mert, Yelda; Saygin, Nicel; Mert, Suha Orcun
Even after the end of 20th century, the details of connection between energy especially energy production-and the environment were not fully understood. The population growth in last thirty years, undeniable climate changes and the starvation of non-renewable energy source reserves leaves no room for doubt, however: energy and environment share a strong and significant connection. This perspective is especially important in the world of economics, considering the cost of energy for end users. This study covers the economic impact and gain of applying exergy efficient planning to a building block. The study hereby undertakes a case study to show that an efficient planning can help save energy, and thus money. The existing blocks of the chosen case had 2% energy efficiency, while the designs proposed in the study have 10-11%. The findings in this study show that an 8 % improvement in the exergy efficiency of the building block results in 780.05TL saving for a single housing. This sums up to 54.603,49TL for the building block annually.
Exergetic Simulation and Performance Assessment of 1-1 Shell and Tube Heat Exchangers
(Springer international Publishing Ag, 2018) Mert, Suha Orcun; Badak, Utku
Exergetic Simulation and Performance Assessment of 1-1 Shell and Tube Heat Exchangers
(inderscience Enterprises Ltd, 2016) Badak, Mehmet Utku; Mert, Suha Orcun
The scope of this work is to apply exergetic simulation and performance investigation of 1-1 shell and tube heat exchanger using Comsol Multiphysics simulation program. Applying simulation to energy intensive systems has great importance before the design phase as it gives the engineers the possibility to avoid energy loss and increase efficiency before constructing the device and experimenting it. Since the modelling and optimisation is essential for better performance in thermal systems by including detailed computational fluid dynamics (CFD) and multiphysics a broad parametric study is applied considering the operating parameters of inlet flow rates and temperatures of the fluids. 3D results for temperature, velocity and pressure profile for each case is determined and evaluated in a finely meshed structure. The results showed the exergy destruction is minimised in high shell-side velocity and temperature and low tube-side velocity and temperature.
Exergoeconomic Analysis of a Direct Formic Acid, Fuel Cell System
(Pergamon-elsevier Science Ltd, 2016) Mert, Suha Orcun; Reis, Alper
In this study, the exergoeconomic analysis of a direct formic acid fuel cell (DFAFC) power system for transportation applications is applied. This analysis covers system components such as compressor, humidifiers, heat exchangers and the cooling system besides the fuel cell stack. The effect of the operating temperature, pressure, current density, anode cathode stoichiometry and reference properties on system are evaluated, to predict the performance as close to real-cases as possible. The exergetic cost of power production is utilized and parametrically investigated regarding the exergy destructions and efficiency of the system. It is found that the optimum conditions for fuel cell operation is 323 K temperature, 3 atm pressure, 303 K reference temperature and 3 anode stoichiometry, respectively. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Exergoeconomic Based Multi-Objective Optimisation of a Solid Oxide Fuel Cell System
(inderscience Enterprises Ltd, 2014) Mert, Suha Orcun; Ozcelik, Zehra; Dincer, Ibrahim
In this study, the multi-objective optimisation of a solid oxide fuel cell (SOFC) system by defining the objective functions to maximise the power output, energy efficiency and exergy efficiency, and minimise the cost under various constraints is conducted. In this regard, energy, exergy and exergoeconomic analyses are performed. Some specific cases are considered and studied parametrically by varying practical operating conditions, namely temperature, pressure, current density and stack assembly thickness. An exergoeconomic model is developed for the system and incorporated into the developed computer program MULOP (multi-objective optimiser) which is based on a genetic algorithm to investigate the system parametrically, depending on the multi-objective optimisation of the objective function ratios. The best result obtained for each objective function is 1.65 W for the power produced, 0.242 and 0.269 for both exergy and energy efficiencies, respectively, and 0.0017 $/W for the cost generated.
Exergoeconomic Performance Investigation of a Batch Ethylene Glycol Recovery System
(inderscience Enterprises Ltd, 2016) Mert, Suha Orcun; Ersoz, Erkan
A detailed exergoeconomic analysis of an ethylene glycol recovery system is conducted in this study considering a broad system modelling. In the process, ethylene glycol is attempted to be distilled from the waste of a polymer producing chemical plant that includes water, glycols and some anhydrides. The purification is sustained by a distillation system that operates in a batch manner which is heated by an electric fired heating oil system. The heating system, reboiler and condenser groups are investigated for understanding the characteristics of the system and revealing the efficiencies exergetically and the cost values exergoeconomically. The calculations are done by developing a computer program using MATLAB. Overall system exergetic cost values, with respect to the time, are calculated depending on the real data gathered from the plant and the exergy destruction points. The exergoeconomic costs for the system are then pointed out for sustaining a better efficiency and cost.
Experimental Performance Investigation of a Shell and Tube Heat Exchanger by Exergy Based Sensitivity Analysis
(Springer, 2016) Mert, Suha Orcun; Reis, Alper
Heat exchangers are used extensively in many industrial branches, primarily so in chemical and energy sectors. They also have important household usage as they are used in central and local heating systems. Any betterment on heat exchangers will serve greatly in preserving our already dwindling and costly energy resources. Strong approach of exergy analysis -which helps find out where the first steps should be taken in determining sources of inefficiencies and how to remedy them- will be used as a means to this end. The maximum useful work that can be harnessed from systems relationships with its environment is defined as exergy. In this study, the inlet and outlet flow rate values of fluids and temperature of hot stream both on shell and tube parts of a shell-tube heat exchange system have been inspected and their effects on the exergy efficiency of this thermal system have been analyzed. It is seen that the combination of high tube side inlet temperature, low shell side flow rate and high tube side flow rate are found to be the optimum for this experimental system with reaching 75, 65, and 32 % efficiencies respectively. Selecting operating conditions suitable to this behavior will help to increase the overall efficiency of shell-tube heat exchange systems and cause an increment in energy conservation.
Lca of a Mass Housing Area From an Energy Based Economy Perspective
(int Journal Contemporary Economics & Administrative Sciences, 2017) Mert, Yelda; Mert, Suha Orcun
As a technique that covers a system or environment from cradle-to-grave, Life-Cycle Assessment (LCA) assesses an environment-economy associated evaluation considering all the stages of a product's life. Buildings and settlement zones are known to be major energy consumption areas that lead to emission of significant amounts of greenhouse gases and to economic losses. In this study, the efficiency analysis of the YYU TOKI Lodgments is conducted through the energy based economic LCA analysis. A comprehensive energy analysis is made to evaluate the economic LCA of the energy system in this settlement area, utilizing year-long temperature measurements for outside and indoors. The results of the study indicate a large potential of economic benefit conservation for the case area despite the fact that energy performances of sample site are relatively high compared to the current building stock averages of Turkey.
Parametric Exergetic Investigation of a Direct Formic Acid Fuel Cell System
(Springer international Publishing Ag, 2018) Mert, Suha Orcun; Reis, Alper
Performance Assessment of a Direct Formic Acid Fuel Cell System Through Exergy Analysis
(Pergamon-elsevier Science Ltd, 2015) Reis, Alper; Mert, Suha Orcun
In this study, performance assessment of a direct formic acid fuel cell system is conducted, including evaluation of a broad set of operating parameters. The fuel cell system is modeled and simulated by using sub-routine developed by Matlab. The system components, such as compressor, humidifier and heat exchangers, are also taken into consideration. Effects of varying operating temperature, pressure, membrane thickness, current density, anode cathode stoichiometry and reference properties on the system are evaluated to predict the performance as close to real-cases as possible. It is found that increasing the temperature greatly favors the performance of the direct formic acid fuel cell system, low pressure and high reference environment temperature values have the same effect on the cell performance. The maximum exergetic efficiency by broad parametric investigation is estimated as 24%, where the power production is 10 kW. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Simulation and Modelling of a Solar-Aided Underground Energy Storage System
(Vinca inst Nuclear Sci, 2023) Ozdamar, Hazel Saglam; Ozdamar, Seyit; Mert, Suha Orcun
The significance of energy storage methods and related R and D studies are increasing due to the depletion of fossil fuels, rising energy prices, and growing environmental concerns. Storage of energy means elimination of practical concerns for the time difference between the time when the energy is produced and when it's needed. The importance of producing and storing energy through renewable sources is increasing every day, especially in developing countries like Turkiye, as such countries would like to reduce their dependence on foreign sources. This study focuses on an underground thermal energy storage system that was modeled for Van Region, using M-file program. The performance of an isolated day heat system as a thermal energy storage was investigated, and the thermal energy storage capacity of the system was researched for a 5 m x 5 m x 5 m soil area located on the Van Yuzuncu Yil University Campus. The temperature distribution, heat loss, and efficiency calculations were performed for a complete year and 3-D representations of the findings were obtained. The lowest efficiencies were observed in May, while the highest efficiencies were observed in July. It was found that the maximum heat loss from the system took place during December and January, and the system could be easily and effectively become a heating source for a single household with the addition of a heat pump.