Browsing by Keyword "Radiation"
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Item Design of a Radiant Heat Capturing Device for Steel Mills(2021) López Pérez, Susana; Herrero López, Saioa; Ubieta Astigarraga, Eduardo; del Hoyo Arce, Itzal; Gómez de Arteche Botas, Mercedes; Iturralde Iñarga, Jon; Fernández de Arroiabe Txapartegi, Peru; Bou-Ali, M. Mounir; Unamuno Iriondo, Iñigo; Tecnalia Research & Innovation; SISTEMAS TÉRMICOS EFICIENTESThis paper approaches the energy transition towards decarbonization and lower primary energy use in the steel and glass industries through the exploitation of radiant waste heat. In contrast with exhaust gases heat recovery, radiant waste heat has typically not been used. This energy waste is found in energy intensive processes in which high temperatures are reached. For instance, in the steel making process, the cast steel is red hot and emits a considerable amount of radiant energy. In this paper the conceptual design of a radiant heat capturing device is presented. This device enables the recovery of currently unused energy while solving the radiative emission-related problems. The achieved design gets to an optimized solution regarding view factors and optical properties of the involved surfaces. In this research work, those factors are optimized to maximize the amount of heat recovered by the presented device. Simulation tools are used to test different designs and define the most appropriate solution for a given case.Item Enhanced millimeter wave transmission through quasioptical subwavelength patterned structures(2004) Beruete, M.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Martín-Moreno, L.; García-Vidal, F. J.; Tecnalia Research & InnovationWe show that the phenomenon of extraordinary transmission though arrays of subwavelength holes is also present in the microwave range as it occurs in the optical regime. Following simulations of the influence of the number of holes, a prototype has been designed and fabricated in an Aluminum plate. By using a Millimeter Wave Quasioptical Vector Network Analyzer in the range between 40 GHz and 110 GHz, measurements of the transmission response has been performed. A resonant total transmission at wavelengths close to the period of the array appear in the spectra. Moreover, an structure consisting of a single narrow slit flanked by a finite array of grooves is now under consideration. All these structures operating in the subwavelength regime are opening the possibility of exciting future applications.