Spectral Data

Spectral data tab on Panes Dialog.

Solar transmission and reflectance data is entered for a range of wavelengths between 0.1 and 4 microns. This data will generally have been extracted from the IGDB (International Glazing Database) and supplied by DesignBuilder.

The data is arranged in comma-separated table form with a single line per wavelength, each line having 4 columns:

1. Wavelength (microns)
2. Solar transmittance (Tsol)
3. Solar reflectance, front (Rsol1)
4. Solar reflectance, back (Rsol2)

An example is shown in the screenshot below.

In cases where the pane layer has been flipped in the Glazing dialog then the last 2 columns (front and back reflectance) will be reversed in the data supplied to EnergyPlus for the pane layer.

Note: DesignBuilder v3.1 and later allow spectral data to be edited either at library level or within the model.