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APPLICATION OF THE CW MODEL FOR THE SOLUTION OF NON-GRAY COUPLED RADIATIVE CONDUCTIVE HEAT TRANSFER IN DOUBLE GLASS WINDOW WITH A CAVITY FILLED WITH MIXTURES OF ABSORBING GASES

DOI: 10.1615/ICHMT.2004.RAD-4.560
9 pages

Kamal A. R. Ismail
Department of Thermal and Fluids Engineering - FEM, State University of Campinas, Brazil

Carlos T. Salinas
Department of Thermal and Fluids Engineering - FEM, State University of Campinas, Brazil

Resumo

Coupled radiation conduction heat transfer in non-gray participant media is present in many practical applications, such as thermal isolation at high and ambient temperatures. In glass window thermal insulation applications in hot climates, infrared absorbing gases appear as an alternative to improve their thermal performance. The thermal modeling of glass windows filled with absorbing gases is somewhat difficult due the spectral variation of the absorption coefficients of the gases. In this work, the cumulative wavenumber (CW) model is used to treat the spectral properties of mixtures of absorbing gases and the radiative transport equation is solved using CW model and the discrete ordinates method. Due to the range of temperature variation, the mixture of gases is considered as homogeneous. The absorption coefficients were obtained from the database HITRAN. The energy equation in its two-dimensional form is solved by the finite volume technique. Three types of gas mixtures highly absorbing, medium and transparent are investigated, to determinate their effectiveness in reducing heat gain by internal ambient. Reflective glasses are also treated. The numerical method to solve radiative heat transport equation in gray and non-gray participant media was validated previously. The temperatures distributions in the gas and the glass domain are computed and the thermal performance of the gas mixtures is evaluated and discussed.

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