naa a22 4500 510822215 CHVBK 20180411083538.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12541-013-0119-6 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0119-6 Reduction of heat losses for the in-line induction heating system by optimization of thermal insulation [Elektronische Daten] [Hong-Seok Park, Xuan-Phuong Dang] Improving the electrical energy efficiency of the manufacturing process is the imperative task to resolve the cost-saving pressure and environmental legislations. This paper focuses on a study on the thermal efficiency of the in-line induction heating systems that are using in the hot forging applications. Besides optimizing the process parameters that increase the electromagnetic and thermal efficiency, reducing the heat losses to the surrounding air is one of the practical ways to save the operating energy. The weakness of the current in-line induction heating systems were pointed out, and we proposed an insulating system to reduce the heat losses caused by convection and radiation. The analytical model of the heat transfer and the simulation model were built to calculate and verify the thermal efficiency of the insulating covers. The results show that using insulating covers at the open spaces between adjacent heaters of an in-line induction heating for automotive crankshaft forging can approximately reduce 9% of heat losses compared with the energy stored in the workpiece. The best values of the geometrical design parameters of the insulating cover were determined by solving the constrained optimization that considers some technological aspects of the proposed insulating system. This work is intended as a contribution to make the hot forging industry become greener and more efficient in terms of saving operating energy. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 Thermal insulation nationallicence Induction heating nationallicence Energy-savings nationallicence Optimization nationallicence α : heat-transfer coefficient (W/m2°C) nationallicence λ : thermal conduction (W/m°C) nationallicence ɛ : emissivity nationallicence ν : kinematic viscosity (m2/s) nationallicence σ : Stefan-Boltzmann constant (W/m2.K4) nationallicence q : heat transfer rate per unit length (W/m) nationallicence t : temperature (°C) nationallicence Gr : Grashof number nationallicence Nu : Nusselt number nationallicence Pr : Prandtl number nationallicence Ra : Raleigh number nationallicence Park Hong-Seok Laboratory for Production Engineering, School of Mechanical and Automotive Engineering, University of Ulsan, 680-749, Ulsan, Korea aut Dang Xuan-Phuong Laboratory for Production Engineering, School of Mechanical and Automotive Engineering, University of Ulsan, 680-749, Ulsan, Korea aut International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 903-909 2234-7593 14:6<903 2013 14 12541 https://doi.org/10.1007/s12541-013-0119-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0119-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Park Hong-Seok Laboratory for Production Engineering, School of Mechanical and Automotive Engineering, University of Ulsan, 680-749, Ulsan, Korea aut NATIONALLICENCE 700 1- Dang Xuan-Phuong Laboratory for Production Engineering, School of Mechanical and Automotive Engineering, University of Ulsan, 680-749, Ulsan, Korea aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 903-909 2234-7593 14:6<903 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer