A new algorithm is developed to shorten the computation time of radiative heat exchange. This algorithm waves the multiple usage of the Monte Carlo method for those calculations. And the availability is shown by applying the algorithm to an inverse radiative property value problem and to nongray analysis in a multi-dimensional, and distributed-property-value system. To realize this objective, optical path length is divided into two parts: information on physical distance between elements and absorption coefficients, and the former values are calculated only one time by using the Monte Carlo method. In the radiative heat transfer calculation, carried out in the nongray and inverse problems, the values of the optical path lengths required by the calculations can easily be calculated by multiplying the precalculated physical path length and the gray/monochromatic abosrption coefficient in the leement, and the Monte Carlo calculation is not required for the calculation, which can reduce the computation time to about one twentieth.
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