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Öğe A review on the evolution of induction fluid heaters(Taylor & Francis Inc, 2022) Kelesoglu, Alper; Kanmaz, Nergiz; Unver, H. Murat; Unver, UmitFossil fuel firing heating systems will be substantially abandoned in the near future due to the zero-carbon goals. They will be replaced with heating systems that use renewable energy sources. Since the investment costs and area requirements of the renewable energy systems are high, the developments of highly efficient electric fluid heating systems have critical importance for a sustainable, environmentally friendly and clean heating. Among the electrical heating systems, induction heaters offer quite easy to use and better adaptability to most heating systems by allowing fluid heating without the necessity for contact. In this paper, a comprehensive review of the evolution of the induction fluid heaters is given by presenting the historical background. The most important milestones of induction fluid heating systems are presented. The development strategies suggested by the different papers including patents are investigated. The findings revealed that induction fluid heating systems, which reach approximately 100% thermal efficiency. These systems are introduced as follows: clean, non-emitting fluid heating system. Because of this, the study concludes that induction fluid heaters are one of the most promising alternatives to other electric heating systems in the long run.Öğe Analysis Of A Novel High Performance Induction Air Heater(Vinca Inst Nuclear Sci, 2018) Unver, Umit; Yuksel, Ahmet; Kelesoglu, Alper; Yuksel, Fikret; Unver, Halil MuratThis study represents an experimental and numerical investigation of the enhanced prototypes of the induction air heaters. For this purpose, flow field is enhanced in order to avoid turbulence. The air mass flow rate, outlet construction and the application of insulation of the outer surface of the heater were selected as the performance enhancing parameters. Depending on the exit construction, the new designed prototypes are named as K-2 and K-3. Experiments were performed under two groups for three various flow rates. In the first group, non-insulation situation is examined. In the second group tests, insulation is applied to the outside of windings and inlet-outlet flaps which constitute the boundary of the control volume for the prevention of heat losses. The increasing flow rate boosted the thermal efficiency by 9%. Each of insulation and enlarging exit cross section increased the thermal efficiency by 13%. It was observed that the thermal power transferred to air with the new prototypes increased about 246 W more than the previous designs. The thermal efficiencies of the K-2 and K-3 type heaters were calculated as 77.14% and 87.1%, respectively.Öğe Analysis of the effect of construction parameters on energetic and exergetic efficiency of induction air heaters(Inderscience Enterprises Ltd, 2018) Unver, Umit; Yuksel, Fikret; Kelesoglu, Alper; Yuksel, Ahmet; Unver, H. MuratThis study is concerned with the energy and exergy efficiency analysis of a novel air heater that operates with induction principle. The aim of this paper is investigation of the energy and the exergy efficiency augmentation of the new K-1 induction air heater prototype. Energy and exergy performance of the K-1 prototype was analysed and compared with the previous K-0 prototype. The analyses were performed with experimental study and with computational fluid dynamics (CFD) simulations. The new design boosted the energy efficiency about 22.98%. The exergy efficiency was calculated to be around 11.5% max. The CFD simulation results showed that a 1 m/s increase in the inlet velocity yields 3.1% and 0.06% augmentation in the energy and the exergy efficiency respectively. The inlet temperature increase negatively affects the energy and the actual exergy efficiencies. It was concluded that efficiencies of these heaters can be enhanced with more appropriate construction.Öğe Introduction of a Novel Design Approach for Tunnel-Type Induction Furnace Coil for Aluminium Billet Heating(Springer Heidelberg, 2018) Unver, H. Murat; Unver, Umit; Kelesoglu, AlperIn this paper, a user-friendly algorithm was developed by analysis of induction heating of aluminium in a radial direction using analytic, numerical and experimental methods. The aim of this study was to investigate the design data required for the coil and the power supply. The mathematical model of the heating process was simplified into one dimension. The general equation of heat conduction was solved analytically in cylindrical coordinates. The results are validated with the results of experimental and numerical methods. In the study, it is seen that the radial temperature distribution can be modelled with a second-degree equation with a 7% error rate. An important benefit of this paper is the homogenization time coefficient that is a useful tool for calculating the total resting time. Finally, a basic and user-friendly method was described to investigate the length of a tunnel-type induction furnace coil design.Öğe Modeling of Induction Fluid Heater via Transformer Equivalent Circuit(Institute of Electrical and Electronics Engineers Inc., 2023) Kelesoglu, Alper; Unver, Halil Murat; Unver, UmitIn air conditioning systems where electrical energy is used as input, resistance and infrared heating systems are effectively used today. Due to its advantages, induction heating systems are a technology in the development stage as an alternative to these two technologies. In this study, the electromagnetic performance of an induction gas heater operating at grid frequency is investigated experimentally and theoretically. A mathematical method is developed to determine the conversion efficiency of electrical power to heat on conductive material. The results obtained are compared with experimental findings. © 2023 University of Split, FESB.
