Calculations of narrow-band transimissities and the Planck mean absorption coefficients of real gases using line-by-line and statistical narrow-band models

Abstract

Narrow-band transmissivities in the spectral range of 150 to 9300 cm^-1 and at a uniform resolution of 25 cm^-1 were calculated using the statistical narrow-band (SNB) model with the band parameters of Soufiani and Taine, the more recent parameters of André and Vaillon, and the line-by-line (LBL) method along with the HITEMP-2010 spectroscopic database. Calculations of narrow-band transmissivity were conducted for gas columns of different lengths and containing different isothermal and non-isothermal CO₂-H₂O-N₂ mixtures at 1 atm. Narrow-band transmissivities calculated by the SNB model are in large relative error at many bands. The more recent SNB model parameters of André and Vaillon are more accurate than the earlier parameters of Soufiani and Taine. The Planck mean absorption coefficients of CO₂, H₂O, CO, and CH₄ in the temperature range of 300 to 2500 K were calculated using the LBL method and different versions of the high resolution transmission (HITRAN) and high-temperature spectroscopic absorption parameters (HITEMP) spectroscopic databases. The SNB model was also used to calculate the Planck mean absorption coefficients of these four radiating gases. The LBL results of the Planck mean absorption coefficient were compared with the classical results of Tien and those from the SNB model.

Keywords

transimissity / HITEMP / HITRAN / Planck mean absorption coefficients

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Acknowledgements

This work was supported by the National Major Scientific Instruments Development Project of China (No. 2012YQ220119), the National Natural Science Foundation of China (Grant Nos. 51306001 and 51376008) and the National Science Fund for Distinguished Young Scholars of China (No. 51025622).

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