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When solving many problems of radiation heat transfer, it is necessary to calculate the irradiation coefficient (angular coefficient). These coefficients must be approximated with great accuracy, and in non-stationary cases, the speed of calculations is important. Authors propose method of numerical evaluation of irradiation coefficient (angular coefficient) between two surfaces, based on the method of cubature formula and unit sphere method. The method showed high precision comparing to cubature formulas on same computational efforts. [ABSTRACT FROM AUTHOR]

The paper considers the calculation of the value of the irradiation coefficient between the surfaces. According to the definition, irradiation coefficient is the surface integral of the second kind and geometrical characteristic of surfaces interposition. Defining the formula to calculate the value of these coefficients is very difficult. There were obtained formulas in [1] for calculating these coefficients of arbitrary surfaces. Although cubic formulas are introduced in [2, 3, 4] to numerically calculate these coefficients. [ABSTRACT FROM AUTHOR]