Modeling > Modeling Radiation > Modeling Surface-to-Surface Radiation > Formulation > Energy Equation Source Term

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Energy Equation Source Term

The effects of radiation are accounted for in the energy equation through the radiant flux. At each closed-boundary face (see Setting S2S Radiation Model Parameters), f, associated with patch i, the radiant heat flux is the sum of the radiant heat fluxes of all the spectra for the patch:

(32)

including Thermal, Gray and Multiband, and Solar.

The total heat flux through the boundary is updated as:

(33)

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