An assessment of real-gas modelling in 2D enclosures

In order to model efficiently the radiative transfer in a real-participatin g gas, various methods have been developed during the last few decades. Eac h method has its own formulation and leads to different accuracies and comp utation times. Most of the studies reported in the literature concern speci fic real-gas models, and very few are devoted to an extended comparison of these models. The present study is a 2D assessment of the main real-gas met hods: the cumulative-k method (CK), the statistical narrow-band model (SNB) , the hybrid SNB-CK method, the grey-band method (GB), the weighted sum of grey gases method (WSGG), the spectral line-based weighted sum of grey gase s method (SLW) and the exponential wide band model (EWB). Five cases have b een considered: two homogeneous and isothermal cases with a single particip ating gas (CO2 and H2O), two non-homogeneous and non-isothermal cases with a single participating gas (CO2 and H2O), and one homogeneous and non-isoth ermal case with a mixture of CO2 and H2O. Although the SNB and SNB-CK metho ds are the most accurate methods, the SLW method seems actually the best de al between accuracy and computation time. (C) 1999 Elsevier Science Ltd. Al l rights reserved.