Application of an extended ESFT method to calculation of solar heating rates by water vapor absorption

Computer Science – Numerical Analysis

Scientific paper

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Absorptivity, Radiative Heat Transfer, Solar Heating, Solar Radiation, Thermal Absorption, Water Vapor, Atmospheric Models, Error Analysis, Least Squares Method, Numerical Analysis, Radiative Transfer, Scattering

Scientific paper

A new method for the exponential-sum fitting of transmissions (ESFT) is developed. A set of equivalent absorption coefficients is determined by a successive correction technique with a set of weights preselected empirically or according to some quadrature weights. The ESFT method is then applied to transmission functions of water vapor-bands in the NIR deduced from the AFGL absorption-line parameters. Numerical values of the ESFT parameters are presented for each of the water-vapor bonds and for the one-band parameterization for total absorption. Solar radiative heating rates computed from the present ESFT parameters are compared with those in the literature, as well as with the exact values of Chou. The accuracy and utility of the method are demonstrated.

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