Modelling of an infrared halogen lamp in a rapid thermal system

MATEC Web of Conferences, 2018

The purpose of this work is to analyze the efficiency of the technical solution that is based on thermal insulation of the infrared radiant burner outer surface and to identify of the characteristics of combustion and heat and mass exchange processes. Calculation of the heat balance is performed for thermal capacities of 5, 10, 15, 20, 30, 40 kW and proceeding from the main goal that was to generate directed local heating of workplaces and production areas. We used Ansys Multiphysics software and Fluent CFD solver to implement finite element analysis. Calculation of the thermal insulation layer thickness for a given external surface temperature was additionally performed. The technical solutions offered provides an optimal thermal regime in the whole building and enable us to increase the efficiency of the high temperature infrared radiant emitter to 2-17% and a consequence of the system as a whole.

55th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2004

This paper deals with the development and manufacturing of a radiometer plate to be used in space simulation tests of space systems to measure and verify the uniformity of absorbed heat flux imposed by a Tungsten Filament Lamp. The radiometer plate is composed of an aluminum plate (670x550 mm), on which 49 radiometers are placed, black painted square copper plates (39x39x0.6 mm). On each radiometer a thermocouple was installed on the opposite surface to that being measured and these were isolated from the aluminum plate by nylon strands (∅ 0.20 mm) MLI (isolating shrouds). In order to install the lamp a vertical rod was placed at the center of one of the extremities of the aluminum plate and to this rod a horizontal rod was connected which made it possible to place the lamp in central position. Preliminary checks of flux and uniformity were carried out at environmental conditions in the Laboratory. The principal results were obtained in a high vacuum environment (≅ 10 -7 Torr) in a 1x1 m thermal vacuum chamber. To guarantee that the thermal loads emanated only from the lamp, the chamber was kept at a temperature of --180 0 C. Several tests were carried out which varied the height of the lamp to the plate as well as the wattage (125, 250, 375, 450, 500 W). The Laboratory's data acquisition system was used to obtain the temperature data of each radiometer. This system handles 500 measuring channels with acquisition at 30 seconds intervals. From this information the heat fluxes are calculated and presented in the form of graphs. From the results obtained it was possible to evaluate which wattage and position of the lamp provided the best distribution of absorbed heat flux by a space system thermal control surface.

Journal of Materials Processing Technology, 2001

Journal of Physics D: Applied Physics, 2011

A set-up that aims to determine the infrared radiation fraction of the energy balance of high intensity discharge (HID) lamps has been designed, constructed and calibrated. It consists of a high-resolution integrating sphere that can cover a wide spectral range. New in this work is that the integrating sphere measurements can be used in the infrared part of the spectrum up to 10 µm and that we have calibrated the absolute intensity in that range. No calibration standards for spectral radiant flux are readily available in the infrared. Therefore, we have used a resistive heated platinum ribbon as absolute intensity reference. As a first testcase, this new set-up was used to determine the energy balance of a Philips CDM-T 70W/830 lamp, which is a type of metal halide HID lamp. spectrally resolved . We will use spectrally resolved absolutely calibrated integrating sphere measurements to determine the infrared contributions to the spectrum up to 10 µm.

Thermal and thermo-mechanical modeling and characterization of solid state lightening (SSL) retrofit LED Lamp are presented in this paper. Paramount importance is to design SSL lamps for reliability, in which thermal and thermo-mechanical aspects are key points. The main goal is to get a precise 3D thermal lamp model for further thermal optimization. Simulations are performed with ANSYS and CoventorWare software tools to compare different simulation approaches. Modeled thermal distribution has been validated with thermal measurement on a commercial 8W LED lamp. Materials parametric study has been carried out to discover problematic parts for heat transfer from power LEDs to ambient and future solutions are proposed. The objectives are to predict the thermal management by modeling of LED lamp, get more understanding in the effect of lamp shape and used materials in order to design more effective LED lamps and predict light quality, life time and reliability.

MATEC Web of Conferences, 2017

The article presents a finite element model for simulating a gasfired IR radiation system. Simulation of gaseous combustion and discrete ordinates radiation model were used to solve a number of heat-transfer problems in ventilated rooms with radiant heating. We used Ansys Multiphysics software and Fluent CFD solver for implementing finite element analysis. To solve differential equations of heating and gas dynamics, the following boundary conditions were considered. Dry methane was used as the fuel and air with 21% of oxygen, as oxidizer. Fuel consumption was 0.5 m3/hour; the gas pressure before the nozzle was 1270 Pa. The air-fuel ratio was 9.996.

2005

This article deals with the calculation of the filament lifetime regarding the evaporation of tungsten mass from the filament surface. The filament of an incandescent lamp represents an electric resistor. Its resistance depends on the intensity of tungsten mass evaporation. If an electrical power is applied, it is converted to heat that causes the temperature rise in the filament. The intensity of tungsten mass evaporation depends strongly on the filament temperature. Therefore, the modelling of filament geometry and simulation of its temperature field is described as well. The finite element method (FEM) has been used for the temperature field solution. The steady temperature fields were derived in the five solution steps. Calculation of separate solutions differs with reference to the filament diameter reduction in the process of evaporation. Actually, the change of the diameter represents decreasing of the filament material (tungsten). Following this change, the assumed lamp life is evaluated subsequently. The result of the life calculation was compared with the life data listed in the work standard for 7528 car lamp produced by OSRAM that we have modelled. The temperature field obtained by FEM was compared with thermovision camera measurement. K e y w o r d s: filament lifetime

2019

This study proposes a modelling strategy to simulate the heating stage during the production of thermoplastic composite tapes. Impregnation using a slurry powder technique with carbon fibres and PEKK (PolyEther-Ketone-Ketone) requires a heating step, to evaporate the aqueous phase and melt the polymer powder. These phenomenon are highly temperature dependant justifying the need to characterise heat transfer within the IR oven. In the literature, most models refer to clear lamps with Lambertian emission. In this study, tubular lamps with a coating on the back side (i.e. integrated reflector) are used. This integrated reflector greatly modifies the lamps spatial emission, therefor the lamp can no longer be modelled using a cylinder with Lambertian emission. This study proposes an adaptation of the radiosity method to predict spatial emission of the lamp without explicitly accounting for the reflector in terms of radiative exchange. The emission of the lamp was characterised by inverse...

Uludağ University Journal of The Faculty of Engineering, 2016

In this study, the IR heated stress relieve oven, was experimentally and theoretically examined. In experimental measurements, temperature was measured on headlight surface, placed in IR oven, at various conveyor speeds and various distances between IR lamps and headlight surface. In theoretical study, a mathematical model was developed for the headlights surface temperature by using heat transfer theory. The results obtained by the mathematical model and the measurement showed very good agreement with 6.5% average error. It is shown that mathematical model can be used to estimate the surface temperatures in case of different conditions were run in oven.

Applied Optics, 2010

We have developed a physical model for the spectral irradiance of 1 kW tungsten halogen incandescent lamps for the wavelength range 340-850 nm. The model consists of the Planck's radiation law, published values for the emissivity of tungsten, and a residual spectral correction function taking into account unknown factors of the lamp. The correction function was determined by measuring the spectra of a 1000 W, quartz-halogen, tungsten coiled filament (FEL) lamp at different temperatures. The new model was tested with lamps of types FEL and 1000 W, 120 V quartz halogen (DXW). Comparisons with measurements of two national standards laboratories indicate that the model can account for the spectral irradiance values of lamps with an agreement better than 1% throughout the spectral region studied. We further demonstrate that the spectral irradiance of a lamp can be predicted with an expanded uncertainty of 2.6% if the color temperature and illuminance values for the lamp are known with expanded uncertainties of 20 K and 2%, respectively. In addition, it is suggested that the spectral irradiance may be derived from resistance measurements of the filament with lamp on and off.