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Perpiñà, X. (author), Werkhoven, R.J. (author), Vellvehi, M. (author), Jakovenko, J. (author), Jordà, X. (author), Kunen, J.M.G. (author), Bancken, P. (author), Bolt, P.J. (author)This paper studies the thermal influence of a light-emitting diode (LED) driver on a retrofit LED lamp, also reporting on a procedure for its thermal characterization and multiscale modeling. In this analysis, temperature is measured by infrared thermography and monitoring specific locations with thermocouples. Experimental results point out...article 2015
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Vellvehi, M. (author), Perpina, X. (author), Jorda, X. (author), Werkhoven, R.J. (author), Kunen, J.M.G. (author), Jakovenko, J. (author), Bancken, P. (author), Bolt, P.J. (author)This work deals with the extraction of key thermal parameters for accurate thermal modelling of LED lamps: air exchange coefficient around the lamp, emissivity and thermal conductivity of all lamp parts. As a case study, an 8W retrofit lamp is presented. To assess simulation results, temperature is monitored on the lamp by infrared thermography...conference paper 2013
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Leonov, V. (author), van Andel, Y. (author), Wang, Z. (author), Vullers, R.J.M. (author), van Hoof, C. (author)The technology for in-plane poly-Si thermopiles has been developed. The bulkmicromachined thermopiles are located between two Si bars and connected thermally with those bars through thin-film thermal shunts. The patterned strips of thermocouple material together with thermal shunts form bridges between Si bars. Two versions of a thermoelectric...article 2011
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Wang, Z. (author), van Andel, Y. (author), Jambunathan, M. (author), Leonov, V. (author), Elfrink, R. (author), Vullers, R.J.M. (author)This paper describes the characterization method and results for bulk- micromachined in-plane thermopiles. Made of poly-Si or poly-SiGe, the thermocouple legs bridge the hot and cold side of a Si frame, which is formed by bulk micromachining. The characterization of the fabricated devices is carried out on a dedicated experimental setup, using...article 2011
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Su, J. (author), Leonov, V. (author), Goedbloed, M. (author), van Andel, Y. (author), de Nooijer, M.C. (author), Elfrink, R. (author), Wang, Z. (author), Vullers, R.J.M. (author), Imec/Holst Centre, High Tech Campus 31, 5656 AE Eindhoven, Netherlands Imec, Kapeldreef 75, 3001 Leuven, Belgium (author)Micromachined thermopiles are considered as a cost-effective solution for energy harvesters working at a small temperature difference and weak heat flows typical for, e.g., the human body. They can be used for powering autonomous wireless sensor nodes in a body area network. In this paper, a micromachined thermoelectric energy harvester with 6...article 2010
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TNO Defensie en Veiligheid (author), Veraar, R.G. (author), Mayer, A.E.H.J. (author), Verreault, J. (author), Stowe, R.A. (author), Farinaccio, R. (author), Harris, P.G. (author)By injecting and mixing the fuel upstream of the combustor and initiating the combustion of the fuel-air mixture by a shock wave in the combustor, shock-induced combustion ramjets offer the potential to drastically reduce the length and mass of scramjet propulsion systems. Based on extensive numerical gas dynamic and thermo-mechanical analysis,...conference paper 2010
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Veraar, R.G. (author), Mayer, A.E.H.J. (author), Verreault, J. (author), Stowe, R.A. (author), Farinaccio, R. (author), Harris, P.G. (author), TNO Defensie en Veiligheid (author)By injecting and mixing the fuel upstream of the combustor and initiating the combustion of the fuel-air mixture by a shock wave in the combustor, shock-induced combustion ramjets offer the potential to drastically reduce the length and mass of scramjet propulsion systems. Based on extensive numerical gas dynamic and thermo-mechanical analysis,...conference paper 2009
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Cremer, F. (author), de Jong, W. (author), Schutte, K. (author), Johnson, J.T. (author), Baertlein, B.A. (author)A specular model has been used to predict the passive polarimetric infrared (IR) signature of surface-laid landmines. The signature depends on the temperature of the landmine and the sky radiance. The temperature of the landmine is measured using a thermocouple. The signature itself is measured using a polarimetric IR camera setup. The...conference paper 2002
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TNO Fysisch en Elektronisch Laboratorium (author), Schwering, P.B.W. (author), Kokonozi, A. (author), Carter, L.J. (author), Lensen, H.A. (author), Franken, E.M. (author)Infrared imagers are capable of the detection of surface laid mines. Several sensor fused land mine detection systems make use of metal detectors, ground penetrating radar and infrared imagers. Infrared detection systems are sensitive to apparent temperature contrasts and their detection capabilities are inversely proportional to the amount of...conference paper 2001
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Fierro, V. (author), Miranda, J.L. (author), Romero, C. (author), Andrés, J.M. (author), Arriaga, A. (author), Schmal, D. (author), Visser, G.H. (author), TNO Milieu, Energie en Procesinnovatie (author)The spontaneous ignition of coal stockpiles is a serious economic and safety problem. This paper deals with oxidation and spontaneous combustion of coal piles laid in coal storage yard and the measures to avoid the heat losses produced. Investigations on self heating were carried out with five test piles (2000-3000 tons) built at the ENDESA...article 1999
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Fierro, V. (author), Miranda, J.L. (author), Romero, C. (author), Andrés, J.M. (author), Pierrot, A. (author), Gómez-Landesa, E. (author), Arriaga, A. (author), Schmal, D. (author), TNO Milieu, Energie en Procesinnovatie (author)The exothermic processes during coal storage reduce the calorific value of the coal which in turn results in financial losses. An accurate and easy calculation of the losses may be an efficient tool to evaluate the effectiveness of the measures taken to reduce the spontaneous heating of coal and to predict the appearance of hot spots. This study...article 1999