Person: ALTUN, AYŞE FİDAN
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ALTUN
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AYŞE FİDAN
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Publication Numerical simulation and analytical evaluation of the collection efficiency of the particles in a gas by the wire-plate electrostatic precipitators(MDPI, 2022-07-01) Kılıç, Muhsin; Mutlu, Mustafa; Altun, Ayşe Fidan; KILIÇ, MUHSİN; MUTLU, MUSTAFA; ALTUN, AYŞE FİDAN; Yenişehir İbrahim Orhan Meslek Yüksekokulu; Makine Mühendisliği Bölümü; 0000-0003-2113-4510; 0000-0001-7236-8398; 0000-0001-6816-8377; O-2253-2015; ABB-9566-2020; AAA-2005-2022In this study, a numerical simulation model and an analytical method are introduced to evaluate the particle collection efficiency and transport phenomena in an electrostatic precipitator (ESP). Several complicated physical processes are involved in an ESP, including the turbulent flow, the ionization of gas by corona discharge, particles' movement, and the displacement of electric charge. The attachment of ions charges suspended particles in the gas media. Then, charged particles in the fluid move towards the collection plate and stick on it. The numerical model comprises the gas flow, electrostatic field, and particle motions. The collection efficiency of the wire-plate type ESP is investigated for the particle diameter range of 0.02 to 10 mu m. It is observed that electric field strengths and current densities show considerable variation in the solution domain. Meanwhile, changing supply voltage and charging wire diameters significantly affect the acquired charges on the electrostatic field and particle collecting efficiencies. Simultaneously, the distance between the charging and collecting electrodes and the main fluid inlet velocity has an important effect on the particle collection efficiency. The influence of the different ESP working conditions and particle dimensions on the performance of ESP are investigated and discussed.Publication A conceptual design and analysis of a novel trigeneration system consisting of a gas turbine power cycle with intercooling, ammonia-water absorption refrigeration, and hot water production(MDPI, 2022-10-01) Altun, Ayşe Fidan; ALTUN, AYŞE FİDAN; Mühendislik Fakültesi; Makine Mühendisliği Bölümü; 0000-0001-7236-8398; ABB-9566-2020In this study, the performance of a novel trigeneration system with a gas turbine prime mover, an ammonia-water refrigeration system, and a hot water generation system is investigated from thermodynamic and economic standpoints. The effects of various operating conditions on energy efficiency and the levelized cost of energy are investigated. The proposed system has a production capacity of 45.4 kW power, 14.07 kW cooling rate, and 16.32 kW heat rate. The efficiency of the gas turbine cycle is 49.7%, and it becomes 83.0% after the implementation of the trigeneration system. Through combined heating, cooling, and power generation, primary energy input and the CO2 emissions will be 49% lower compared to separate production. According to the exergy analysis, the combustion chamber is the main component where the greatest exergy destruction occurs. Sensitivity analysis revealed that an increase in the ambient temperature results in a decrease in the energy utilization factor and the net power output. The LCOE of the system is around 0.02 $/kWh, whereas the unit price of the local electricity from the grid is 0.09 $/kWh. The payback period of the absorption sub-cycle is between 4 months and 4 years, depending on the annual operation time of the chiller.Publication Comprehensive thermodynamic performance evaluation of various gas liquefaction cycles for cryogenic energy storage(Mdpi, 2023-12-01) KILIÇ, MUHSİN; ALTUN, AYŞE FİDAN; Mühendislik Fakültesi; Makina Mühendisliği Bölümü; 0000-0003-2113-4510; 0000-0001-7236-8398; O-2253-2015This paper conducts comparative thermodynamic analysis and performance evaluations of various gas liquefaction configurations. The four most common liquefaction systems (Linde-Hampson, Kapitza, Heylandt, and Claude) were considered. The isothermal and multi-stage isentropic compression processes were evaluated and compared as actual compression processes. Thermodynamic evaluation is based on the energy required to compress a unit mass of gas, the liquefied air mass flow rate, and the exergetic efficiency. The modeling results show that three-stage compression cycles retain lower energy requirements. Increasing the compression stage from one to two for all the processes decreases the energy requirement by 34 to 38%. Changing the compression stage number from two to three reduces the energy requirement by 13%. The compression pressure and expander flow rate ratio significantly affect the liquefied air mass flow rate. Hence, a parametric analysis was conducted to obtain the best operating conditions for each considered cycle. Depending on the compression pressure, the optimum expander flow rate values of the Claude, Kapitza, and Heylandt cycles change from 0.65 to 0.5, 0.65 to 0.55, and 0.35 to 0.30, respectively. For the optimum cases, the Claude, Kapitza, and Heylandt cycles result in liquid yields that are about 2.5, 2.2, and 1.6 times higher than that of the Linde-Hampson cycle. The Claude cycle is the best operating cycle for all the considered performance metrics. Moreover, the performances of the Linde-Hampson and Claude cycles are investigated for various gases. Under the same operating conditions, the results show that better performance parameters are obtained with the gases that have relatively high normal boiling temperatures.Publication Influence of window parameters on the thermal performance of office rooms in different climate zones of Turkey(Int Journal Renewable Energy Research, 2019-03-01) ALTUN, AYŞE FİDAN; KILIÇ, MUHSİN; Mühendislik Fakültesi; Makina Mühendisliği Bölümü; 0000-0001-7236-8398; 0000-0003-2113-4510; ABB-9566-2020; O-2253-2015Window and faqade characteristics significantly influence the energy consumption of office buildings. This paper investigates the influence of window configuration on its energy performance regarding shading levels, orientation, geometrical characteristics, and thermo-physical properties. A series of simulations of two common type of office room models were conducted with changing parameters such as the window-to-wall ratio of the faqade, total solar energy transmittance value of the glazing, as well as shading levels regarding orientations. The energy simulations were performed using TRNSYS software for the climatic conditions of Istanbul, Ankara, Izmir, and Hakkari. It was found that appropriate selection of windows and shading devices regarding climatic conditions would lead to a significant reduction of the annual energy consumption and greenhouse gas emissions. The recommendations presented in this paper can be applied to any location around the world that has similar climatic conditions with the cities studied in this work.Publication Dynamic modelling and multi-objective optimization of off-grid hybrid energy systems by using battery or hydrogen storage for different climates(Pergamon-elsevier Science Ltd, 2023-06-23) KILIÇ, MUHSİN; Kılıç, Muhsin; Altun, Ayşe Fidan; ALTUN, AYŞE FİDAN; Mühendislik Fakültesi; Makina Mühendisliği Bölümü; 0000-0003-2113-4510; 0000-0001-7236-8398; O-2253-2015The energy storage problem is an essential issue in renewable energy-based power systems. A comprehensive study is performed to evaluate off-grid hybrid renewable energy systems with a battery bank or a hydrogen system employed as the energy storage option. Dynamic modelling is proposed to see daily and seasonally changes in the system. The economic feasibility of the system and its environmental impacts are investigated in three locations. A multi-objective optimization method based on the Taguchi approach is employed to minimize both levelized cost of energy and the CO2 emissions. Various weight factors were assigned to understand the response of different optimization targets. The results highlight that the hybridization of energy resources allows the annual emissions to be cut by 68-78% for battery storage, 84-90% for hydrogen storage, compared to a dieselonly system. Despite having higher costs, the systems with hydrogen storage can store energy in the long term; therefore, they have lower CO2 emissions.Publication Determination of optimum building envelope parameters of a room concerning window-to-wall ratio, orientation, insulation thickness and window type(MDPI, 2022-03-01) Altun, Ayşe Fidan; ALTUN, AYŞE FİDAN; Orhangazi Yeniköy Asil Çelik Meslek Yüksekokulu; 0000-0001-7236-8398; ABB-9566-2020The building envelope includes all materials (glazing, external walls, doors, etc.) that separate the conditioned space from the outside environment. Building envelope characteristics significantly influence the energy consumption of buildings. In this study, research was carried out to find optimum building envelope design parameters, such as insulation thickness, orientation, glazing type, and the window-to-wall ratio of a room, using actual climatic data of two cities with different characteristics according to the Koppen climatic classification. The insulation thickness and the window type that minimizes the net present worth of the building facade over 20 years of a lifetime gave the optimum values. In addition, the effect of the various parameters, such as the infiltration rate through the envelope, room set-point temperature, and the fuel type, on the net present cost was also analyzed. It was found that appropriate selection of windows, orientation, and insulation thickness would lead to a significant reduction in the annual energy consumption. Despite having the lowest initial investment cost, the room with single glazed windows had the highest energy requirement and the net present cost. The building facade with double glazed windows, oriented towards the south-west, yielded the minimum net present cost in both locations. Results showed that the optimum external wall thickness is 9 cm in Hakkari (Dsa-Continental Climate) and 6 cm in Istanbul (Csa-Mild Climate).