Browsing by Publisher "Inderscience Publishers"
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Item Parametric study of the effect of reference state on energy and exergy efficiencies of a small industrial pasta drying process(Inderscience Publishers, 2009) Ozgener L.; Ozgener O.The paper describes a performance evaluation of the industrial pasta process system in Gaziantep, based in Turkey, on energy and exergy analyses. The case study covers the actual system data taken from the system. General energy and exergy analysis of the system are introduced. This analysis, applied to the system using actual thermodynamic data for its performance evaluation in terms of energy and exergy efficiencies, is presented. In addition a parametric study of the effect of varying reference state properties on the energy and exergy efficiencies of the system has been conducted to find optimum performance and operating conditions, and is explained. Copyright © 2009, Inderscience Publishers.Item An adaptive cone based distributed tracking algorithm for a highly dynamic target in wireless sensor networks(Inderscience Publishers, 2013) Alaybeyoglu A.; Erciyes K.; Kantarci A.Accurate tracking of a target is imperative in military as well as civil applications. In this study, we propose a distributed cone based tracking algorithm for a target that can move with highly dynamic kinematics along linear and nonlinear trajectories. The algorithm provides wakening of a group of nodes in a cone shaped region along the trajectory of the target and particle filtering is used in the prediction of the next state of the target to decrease the target missing ratios. Algorithm used is adaptive in that the shape of the cone is determined dynamically in accordance with the target kinematics. We compared our algorithm with traditional tracking approaches, a recent tracking algorithm (Semi-Dynamic Clustering (SDC)) and other tracking algorithms that we have previously proposed. Simulation results show that, in terms of target missing ratios, our algorithm is superior to all of these algorithms. Secondly, lower target missing ratios lead to less frequent execution of recovery mechanisms which in turn results in lower energy consumptions. © 2013 Inderscience Enterprises Ltd.Item Effects of an adiabatic inclined fin on the mixed convection heat transfer in a square cavity(Inderscience Publishers, 2014) Selimefendigil F.; Oztop H.F.In this study, a square cavity with two ventilation ports in the presence of an adiabatic fin placed on the bottom wall of the cavity is numerically analysed for the mixed convection case for a range of Richardson numbers (Ri = 0.1, 1, 10, 30) and at Reynolds number of 300. The top and bottom walls of the cavity are kept at constant temperature while the verticals walls are assumed to be adiabatic. The effect of the fin height, inclination angle and Richardson number on the fluid flow and heat characteristics is numerically analysed. The results are presented in terms of streamlines, isotherm plots and averaged Nusselt number plots. It is observed that length and inclination angle of the fin significantly alter the streamlines and isotherms and hence the thermal performance of the system. For the best performance at different fin lengths, optimum inclination angle changes. Copyright © 2014 Inderscience Enterprises Ltd.Item Effect of voxel size in flow direction on permeability and Forchheimer coefficients determined by using micro-tomography images of a porous medium(Inderscience Publishers, 2015) Ucar E.; Mobedi M.; Altintas G.; Glatt E.The permeability and Forchheimer coefficients of a porous medium, volcanic rock, are determined using micro-tomography images. A cubic volume in the middle of the images is extracted as REV (representative volume). The voids in the REV are discretised into anisotropic voxels using the commercial program of GeoDict. Seven computational domains with different voxel size in flow direction are generated. The velocity and pressure fields in the voids are obtained for Reynolds numbers ranging from 0.01 to 10. The obtained fields are used to determine the permeability and the Forchheimer coefficients. The performed calculations show that the nominal pore size changes with the voxel size in flow direction, however permeability and the Forchheimer coefficient approaches to the constant values. Copyright © 2015 Inderscience Enterprises Ltd.Item A case study for the software size estimation through MK II FPA and FP methods(Inderscience Publishers, 2016) Borandag E.; Yucalar F.; Erdogan S.Z.Software size estimation is one of the most crucial and daunting tasks for a software project manager. It is very important for the accurate planning and calculation of the software project. The importance of software size estimation becomes critical at the beginning of the software life cycle. Software size estimation is a basic input for the software effort and cost estimation. There are many different approaches and various methods for software size estimation up to now such as the function points method, e.g., IFPUG FPA, Mk II FPA, COSMIC FFP. In this paper, the size of the software project was calculated through the function points method and Mark II FPA. The same software project was implemented by different software development teams. Early estimations were performed for the software project and the data obtained as a result of the teams' studies were compared. Copyright © 2016 Inderscience Enterprises Ltd.Item Control of natural convection heat transfer in ferrofluid filled trapezoidal cavities with a magnetic dipole source(Inderscience Publishers, 2016) Selimefendigil F.; Öztop H.F.; Al-Salem K.S.In this study, a numerical study of natural convection ferrofluid filled trapezoidal enclosure was performed under the influence of a magnetic dipole source. The left inclined wall of the cavity is heated and the right inclined wall is kept at constant temperature lower than that of the heater. Other horizontal walls of the trapezoidal enclosure are assumed to be adiabatic. The governing equations are solved with finite element method. The influence of the Rayleigh number, inclination angle of the side walls, strength of the magnetic dipole, horizontal and vertical location of the magnetic dipole on fluid flow and heat transfer are numerically investigated. It is observed that increasing values of Rayleigh number and inclination angles enhance the heat transfer. The external magnetic field parameters (strength and location) can be used to control the heat transfer and fluid flow inside the trapezoidal cavity. © 2016 Inderscience Enterprises Ltd.Item Can wireless sensor networks be emotional? A survey of computational models of emotions and their applications for wireless sensor networks(Inderscience Publishers, 2017) Kalayci T.E.; Bahrepour M.; Meratnia N.; Havinga P.J.M.Advances in psychology have revealed that emotions and rationality are interlinked and emotions are essential for rational behaviour and decision making. Therefore, integration of emotions with intelligent systems has become an important topic in engineering. The integration of emotions into intelligent systems requires computational models to generate emotions from external and internal sources. This paper first provides a survey of current computational models of emotion and their applications in engineering. Finally, it assesses potential of integrating emotions in wireless sensor networks (WSNs) by listing some use scenarios and by giving one model application. In this model application performance of a neural network for event detection has been improved using brain emotional learning based intelligent controller (BELBIC). Copyright © 2017 Inderscience Enterprises Ltd.Item Energy and exergy analysis of the heating and cooling system of a public building(Inderscience Publishers, 2020) Sevim S.; Yurddas A.Efficient use of energy spent in existing systems is of great importance in terms of energy saving. The aim of this study was to carry out the energy and exergy analyses of the existing heating and cooling systems of a public building and determine the system performances, and bring the system to a thermoeconomic structure by making necessary improvements. In the building, natural gas is used as energy source (fuel) in hot water boilers within the existing heating installation, and electricity is used as energy source in air-cooled water chillers within the cooling system. As a result of the calculations, it was determined that the biggest exergy destruction in the heating system was in the hot water boiler and the biggest exergy destruction in the cooling system was in the water chiller. Other point data obtained were evaluated and heating and cooling system efficiencies were determined. Copyright © 2020 Inderscience Enterprises Ltd.Item Evaluation of the efficiency of the dryers in thermoplastic vulcanisate extrusion production lines with the energy and exergy analysis method(Inderscience Publishers, 2021) Dogru A.K.; Ozgener O.; Ozgener L.; Institute S.E.In this study, energy and exergy analysis of the drying process in producing a sealing profile with extrusion in Manisa, using real operational data was conducted. The drying system was analysed in regards to changes in ambient temperature (0–30°C) and drying air temperature (75–105°C). The energy efficiency of the system was in the range of 80.79%–88.24% and the exergy efficiency was in the range of 15.88%–41.94%. As a result of the analysis, it can be concluded that the drying conditions with the highest efficiency values were at 0°C outdoor temperature and 75°C drying air. Copyright © 2021 Inderscience Enterprises Ltd.Item Improving the abrasion resistance of AISI 304L metallic biomaterial by microwave boriding(Inderscience Publishers, 2021) Arslan D.; Uzun R.O.Metallic materials are used as biomaterials thanks to their high mechanical properties. However, their low resistance to corrosion and abrasion reduces the biocompatibility of them. In this study, the abrasion resistance of AISI 304L metallic biomaterial was improved by pack-boriding with microwave hybrid heating. For this purpose, AISI 304L material was pack-borided by using EKABOR II powder for two, four and six hours in a microwave oven with a power of 2.9 kW and a frequency of 2.45 GHz at temperatures of 850°C, 900°C and 950°C. A boride layer with a thickness ranging between 12.1 μm–56.6 μm was obtained on the surface as a result of boriding. The specific wear rate of the AISI 304L material pack-borided for four hours at 950°C, which exhibits the highest wear resistance, has been determined as 1.04656 × 10–5 mm3/Nm. The abrasion resistance of AISI 304L metallic biomaterial was increased 28 times by microwave boriding. Copyright © 2021 Inderscience Enterprises Ltd.Item Thermodynamics analysis of biomass fired brick drying process(Inderscience Publishers, 2021) Dogru A.K.; Camcioglu E.; Ozgener O.; Ozgener L.For drying the bricks used in the construction sector in Turkey, it is estimated that the power needed is 460 MW. Moreover, the estimated energy consumption and produced brick are 2,680,400 MWh/year and 5 million ton per year, respectively. Due to increasing global warming and climate change, the amount of energy consumed per year for drying decreases. As the outdoor temperature increases, the amount of energy supplied for drying the brick will be reduced. This study was carried out because of this high energy consumption during drying process in brick production sector. According to the case study, energy and exergy analyses of a brick factory with an annual production capacity of 150,000 tons in Manisa were conducted using real operating data. The energy and exergy output values and exergy losses for each component of the process and the whole system were analysed according to ambient temperature (0°C–20°C) and changes in drying air temperature (75°C–105°C). The energy efficiency of the system in the range of 27.95%–34.31% exergy efficiency was found in the range of 48.23%–64.90%. Finally, further measures are proposed for increasing efficiency of system exergy and energy. Copyright © 2021 Inderscience Enterprises Ltd.Item Numerical and experimental determination of the heat transfer coefficient at the casting-mould interface(Inderscience Publishers, 2021) Nişancı M.C.; Yurddaş A.Sanitary tapware faucet that can drain hot and cold water from the plumbing systems in the desired proportions by mixing are called faucets. The raw material of faucets used today is generally brass alloy (CuZn39Pb1Al-C) and their production is carried out through the method of low-pressure die casting. In this study, K type thermocouple was placed in such a way that there was a distance of 3 mm to the casting surface of the mould, and temperature changes during the production were obtained by the measurement and recording device. Interfacial heat transfer coefficient was calculated numerically in Ansys Fluent program with the combination created by 1,283, 1,263, 1,243, 1,223, 1,203, 1,183, 1,163 K values of casting temperature and mould temperatures of 413, 473, 533, 593, 653 K. Numerically calculated heat transfer coefficients are entered by creating casting simulation in the Magma program, and they were analysed by making comparison between experimental temperature curves and simulation temperature curves. Copyright © 2021 Inderscience Enterprises Ltd.Item Do Islamic stock indices perform better than their conventional counterparts?(Inderscience Publishers, 2021) El Khamlichi A.; Yildiz S.B.; Sarkar K.; Hoque H.Applying the preference ranking organisation method for enrichment of evaluations (PROMETHEE II), this study attempts to rank Islamic and conventional indices from 20 developed and 18 emerging markets based on the performance of their MSCI conventional and Islamic country indices between 2002 and 2016. The study finds that the Danish Islamic Index at the top of the ranking and the Hungarian Islamic Index at the bottom. Moreover, conventional indices predominantly perform better than their Islamic counterparts in emerging markets and vice versa in developed markets. © 2021 Inderscience Enterprises Ltd.Item Applicability of cogeneration system in gas turbines used in natural gas storage facilities(Inderscience Publishers, 2022) Türkoğlu S.; Yurddaş A.; Bektaş A.Underground natural gas storage facilities are of critical importance on energy supply security. Storage activity in facilities performing underground storage is mostly carried out in spent natural reservoirs. In this study, the applicability of cogeneration system was investigated in order to generate electricity from flue gas at an average temperature of 500°C and 144.4 t/h flow rate obtained from three gas turbines in storage facilities and to recover the waste heat we lost. This designed system would have three HRSGs and one steam turbine, 16.23 MW energy would be generated from each HRSG in this system. After a total of 48.70 MW energy, obtained from two HGRSs, enters into the steam turbine operating in 24% efficiency, 12.20 MW mechanic energy and 11.84 MW electric energy is generated. Therefore, a total of 97.05 MW energy entering into combined cycle power plant was transformed into a total of 42.25 MW useful energy, including 30.41 MW mechanical and 11.84 MW electricity, and the efficiency of system was calculated as 43.5%. It was aimed that the electric energy to be generated from this cogeneration system would contribute to the related facility and the electricity supply of the public against its price. [Received: October 17, 2020; Accepted: May 03, 2021] Copyright © 2022 Inderscience Enterprises Ltd.Item A study on heating and cooling requirements for green buildings and refugee settlements(Inderscience Publishers, 2022) Cekinir S.; Ozgener O.; Ozgener L.In this study, geothermal-based three different systems are examined comparatively and a decision-making method is used to find the best option to use in refugee settlements. Earth air heat exchanger (EAHE), vertical ground source heat pump (VGSHP), and horizontal ground source heat pump (HGSHP) are evaluated from the viewpoint of environmental impact, performance, economy, and health. This study is the first study related to the evaluation of EAHE and GSHP systems by using the analytical hierarchy process (AHP). It is concluded that EAHE is the best option for refugee settlements; also EAHE is a healthier option for the COVID-19 pandemic. © 2022 Inderscience Publishers. All rights reserved.Item Avoidable thermodynamic inefficiencies evaluation of a sewage water source heat pump system(Inderscience Publishers, 2023) Celik A.G.; Hepbasli A.The performance of a sewage water source heat pump system is assessed through conventional/enhanced exergy-based methods in this present study. The experimental data used in the analyses are based the cooling mode. According to the conventional-based results, the condenser has the lowest exergy efficiency. Beside this, the enhanced exergy-based analysis results show the sewage water heat exchanger should be considered as the most significant component as it has the highest avoidable exergy destruction rate in the whole system and takes the improvement priority. Based on the enhanced exergy analysis, 56% of the total exergy destruction belongs to the avoidable part. Copyright © 2023 Inderscience Enterprises Ltd.Item Dry port integrated port development with microsimulation method for solving port-city conflict: A case of Alsancak Port(Inderscience Publishers, 2023) Yıldırım M.S.; Gökkuş Ü.In this research, we have developed a dry port integrated development scenario for a city port with a port-city conflict problem and evaluated the economic benefits of the integration compared with the ‘port-only’ development. Discrete event simulation was used for developing intermodal port simulation models with (IPSM-2) and without dry port (IPSM-1). A port development cost model was developed for economic comparison of the scenarios considering the port storage area requirement and traffic predictions in 20-foot equivalent units (TEU). The model results indicated that for the year of 2019, IPSM-2 decreased the port storage area up to 87% and IPSM-2 ($101/TEU) was 47% more economical compared to the IPSM-1 ($191/TEU) considering the handling rate. The study concludes that dry port integration can yield sustainable and more economic port development and can be used for solving port-city conflict for land usage. © 2023 Inderscience Enterprises Ltd.Item A parametric study on energy, exergy and exergoeconomic analysis of a paint curing oven(Inderscience Publishers, 2023) Ayvalı Z.N.; Ozgener O.; Ozgener L.This study examines a drying process for paint-drying ovens with actual operating data. This process is one of the most energy consuming processes in the manufacturing process of a company that produces propeller shafts in Manisa. This paper aims to determine the energy and exergy belts on a sectoral basis in light of the examined company and make an efficiency analysis. As a result of the analysis, the exergoeconomic values are calculated as the energy loss/cost ratio in current fresh air temperature is Ren: 7.368 W/$, exergy losses/cost Rex: 0.318 W/$, and the total energy need is reduced by 13.25%. Copyright © 2023 Inderscience Enterprises Ltd.Item Effects of credit rating announcements on risk perception of financial markets in emerging countries(Inderscience Publishers, 2023) Geyikci U.B.This study measured the reactions of five different financial instruments used in credit rating agencies’ (CRAs) announcements using the event study method with 19 years of daily data from 21 emerging countries. It also analysed the reactions of these financial instruments to upgrading and downgrading investment grades. This has not been frequently discussed in the previous literature. There were three key findings: 1) credit default swaps (CDSs), stock markets, 1-year, and 10-year government bonds reacted significantly to CRA announcements while Eurobonds did not; 2) while 1-year bonds and 5-year CDSs reacted significantly only to degradation to non-investment grade, 10-year bonds and stock indices reacted significantly to both gradation and degradation but Eurobonds did not react significantly to either; 3) there were significant reactions to CRA announcements before degradation to non-investment grade, indicating that degradations are predicted by the market prior to their announcement. Copyright © 2023 Inderscience Enterprises Ltd.Item Effect of an algae integrated water wall on energy consumption and CO2 emission(Inderscience Publishers, 2023) Altunacar N.; Ezan M.A.; Yaman Y.; Tokuç A.; Budakoğlu B.; Köktürk G.; Deniz İ.This study develops a transient thermal model for an indoor in which a photobioreactor (PBR) is integrated into one of its facades. Thermal comfort, energy consumption, and carbon dioxide (CO2) emissions were interpreted in different design scenarios for Izmir, Turkey. As a result, it was determined that a 20% window-to-wall ratio (WWR) provides the most comfortable results, and the algae usage increases the annual comfort by 19% and reduces the heating/cooling demand. Compared to a water wall, it provides a 17% reduction in energy consumption and CO2 emissions. Copyright © 2023 Inderscience Enterprises Ltd.