Browsing by Author "Akkaya M."
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Item Reduction of the core size and power losses by using soft magnetic material for a single-phase induction motor(Elsevier B.V., 2022) Balci S.; Akkaya M.Induction motors are widely used in our daily life and industrial machines. Single-phase induction motors with small power, manufactured with few horsepowers (HP), are preferred as compressor motors for household refrigerators and air conditioners. This inevitably leads to the lower energy consumption of compressor systems and requirements for a more compact design. In this study, a single-phase induction motor manufactured with classical core material for a certain power value is modeled using finite element analysis (FEA) software and the power losses are investigated. Later, this electric motor is designed with 6.5% SiFe jfe super core material, one of the soft magnetic core materials, for the same power value and comparative performance studies are performed. In these comparisons, mechanical volume and weight for the motor dimensions, electrical power losses and electromagnetic parameters are studied. It is therefore recommended that the jfe super core material, which has become popular in recent years, be used for the manufacture of single-phase induction motors, which are often used in household appliances. © 2022 Elsevier LtdItem An effective strategy for decreased energy consumption by using Fe3O4 + CeO2 @ POE in Cooling system(SAGE Publications Ltd, 2022) Akkaya M.With a view to decreasing the energy consumption in cooling systems, many different methods have been used at the present time. One of these methods is the addition of solid nanoparticles to the compressor lubricant in order to increase the heat transfer surface. In this context, single and hybrid nanolubricants have been prepared by adding nano-sized iron (II, III) oxide (Fe3O4) and cerium oxide (CeO2) hybrid nanoparticles into polyol ester (POE) at different mass ratios by weight. 0.3% and 0.6% by weight of single Fe3O4 and hybrid Fe3O4 + CeO2 nanoparticles were added to this colloidal suspension separately. In addition, a 0.3% volume fraction of the surfactant triton X-100 (TX-100) was added to each suspension to avoid folliculations in nanolubricants. An experimental study was conducted under two different mass fraction single and hybrid nanolubricant to compressor section of the cooling system, respectively. The maximum improvement in coefficient of performance (COP) and the decrease in compressor work were found to be as 11.84% and 16.73%, respectively, when the hybrid nanolubricant was used as compressor lubricant. © IMechE 2022.Item Usage of Graphene-Doped Tin Oxide Hybrid Nanocomposites in Compressor and Electromagnetic Modeling for Single-Phase Compressor Motor(Institute for Ionics, 2023) Akkaya M.In recent years, the use of hybrid nanolubricants in cooling systems has become necessary due to their improved heat transfer properties. In this study, hybrid graphene oxide (GO)-doped tin oxide (SnO2) nanoparticles were synthesized by a simple chemical precipitation method to produce a nanolubricant. A mass fraction of 0.75% hybrid nanoparticles in polyol ester (POE) was used in the preparation of the nanolubricant. In the synthesis of hybrid nanoparticles, GO nanoparticles were doped with SnO2 at mass fraction of 1%, 2% and 3%. Single and hybrid nanolubricants were used to determine the performance values required for compressor operation. According to the results, when hybrid nanoparticles obtained by doping 2% doped GO nanoparticles were used, the power required for compressor operation decreased by 13.47% compared to pure POE. In addition, electromagnetic modeling of the single-phase auxiliary compressor motor was performed using finite element analysis software. For the hermetic reciprocating compressor, the electric current, power dissipation and magnetic field data were analyzed. © 2022, King Fahd University of Petroleum & Minerals.Item ENERGY ANALYSIS OF SiC–Si3N4 @ POE AND SiC–Si3N4 @ R134a BASED COOLING SYSTEMS(Begell House Inc., 2023) Akkaya M.; Sarilmaz A.; Menlik T.; Ozel F.Passive methods are preferred in cooling systems and the development of these methods is one of the most important issues in terms of energy efficiency. Improving heat transfer in cooling systems by using solid–liquid and solid–gas suspensions instead of the base fluid is a crucial passive method. The compressor in the system was operated with nanolubricants in different mass fractions, and the cooling system was filled with a hybrid nanorefrigerant. The applications of nanolubricants and nanorefrigerants, the concentration of nanoparticles as an additive material in tribological tests, their compatibility with the particle type, base fluid, and surfactant are important parameters. In this context, silicon carbide (SiC) and silicon nitride (Si3N4) nanoparticles were preferred due to their compatibility and superior tribological properties in terms of contact area and wear mechanism. The results show that the addition of nanoparticles to the compressor oil and refrigerant has a positive effect on the system performance when nanolubricant with a mass fraction of 0.34% in polyol ester (POE) and hybrid nanorefrigerant with a mass fraction of 0.055% were used. With the use of nanoparticles, the coefficient of performance (COP) of the system increased by 21.82% compared to pure POE. © 2023 by Begell House, Inc.Item Numerical and experimental analysis of refrigerating performance for hybrid nanolubricants with sepiolite additives(Elsevier Ltd, 2023) Akkaya M.; Sarilmaz A.; Balci S.; Ozel F.The use of nanomaterials in various forms and compositions provides the basis for the creation of high-performance structures in their application in many heating and cooling systems. In this study, the lubrication properties of rod-shaped Sepiolite (SP) and its various carbon composites Carbon Black (CB), Multi-Walled Carbon Nanotubes (MWCNT), and reduced Graphene Oxide (rGO) were investigated for the first time in a vapor compression cooling system. The cooling heat transfer performance was compared by analyzing the rheological and thermal behaviors using nanolubricants. The best improvement in cooling Coefficient of Performance (COP) was obtained by using SP-rGO nanoparticles. Compared to Polyol Ester (POE), the cooling performance COP increased by 23.6 % with the addition of SP-rGO. The strategy proposed here is simple and has great potential for producing high-efficiency cooling systems. In addition, the single-phase compressor motor was modeled with Finite Element Analysis (FEA) simulation in the experimental studies, and the simulation results were reported. According to the power loss data obtained from FEA simulation results, a total power loss of 119 W is determined as core losses of 44 W, winding losses of 65 W and frictional losses of 10 W for a 1 HP single-phase compressor motor. Thus, the electrical energy efficiency of the motor is approximately 86 %. © 2022 Elsevier LtdItem The impacts of synthesized Ag doped ZnO nano-materials on the energy efficiency of the refrigeration system(SAGE Publications Ltd, 2024) Akkaya M.; Yurtdaş S.Nanofluids are used to increase thermal performance in various applications of heat transfer. In the present study, to increase the performance of the cooling system, nanolubricant prepared with zinc oxide (ZnO) and silver (Ag) doped ZnO nanoparticles were used. ZnO and Ag/ZnO nanoparticles were synthesized via precipitation and co-precipitation methods, respectively. The effects of Ag particles added to ZnO nanoparticles at the rate of 5% on thermal performance were investigated. XRD and SEM examinations of the synthesized nanoparticles were made in detail and their suitability was determined. Nanolubricants were prepared by mixing 0.5% and 1.0% (wt./wt.) ZnO or Ag/ZnO and 0.5% (wt./wt.) Tween 80 (T80). The coefficient of performance (COP) values maximum increased by 18.20% and 23.68%, respectively, in the use of mineral oil with added 1.0% ZnO and 1.0% Ag/ZnO nanoparticles in the nanolubricants. In the cooling system, the compressor work decreased by 18.71% using the nanolubricant prepared with Ag-doped ZnO hybrid nanoparticles at a 1.0% mass fraction. © IMechE 2022.