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Keep the default value, Constant, to define a diffuse gray radiation model. In this case, the surface properties (emissivity, radiosity, reflectivity, transmissivity, critical angle) have the same definition for all wavelengths. The surface properties can still depend on other quantities, in particular on the temperature.
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Select Solar and ambient to define a diffuse spectral radiation model with two spectral bands, one for short wavelengths, [0, λ1], (solar radiation) and one for large wavelengths, [λ1, +∞[, (ambient radiation). It is then possible to define the Separation point between spectral bands (SI unit: m), λsol/amb, to adjust the wavelength intervals corresponding to the solar and ambient radiation. The surface properties can then be defined for each spectral band. In particular it is possible to define the solar absorptivity for short wavelengths and the surface emissivity for large wavelengths.
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Select Multiple spectral bands and set the value of the Right endpoint for each spectral band in the table, to define a diffuse spectral radiation model. These values should be set in an ascending order. The value of the Left endpoint for the next spectral band is updated in consequence. It is then possible to provide a definition of the surface properties for each spectral band.
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The first Left endpoint and the last Right endpoint are predefined and equal to 0 and +∞, respectively.
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If shadowing is ignored, global energy is not conserved. Control the accuracy by specifying a Radiation integration order. Sharp angles and small gaps between surfaces may require a higher integration order for accuracy but also more time to evaluate the irradiation.
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