WINDOW 6.3 is a desktop simulation tool from Lawrence Berkeley National Laboratory (LBNL) for analyzing the thermal and optical performance of window and glazing systems. It lets manufacturers, designers, and researchers build detailed multi-layer assemblies—including glass panes, coatings, gas fills, spacers, frames, and shading devices—and calculates key metrics such as U-factor, Solar Heat Gain Coefficient (SHGC), Visible Transmittance (VT), and Condensation Resistance (CR). Based on ISO 15099 methods and supporting NFRC procedures, WINDOW 6.3 reads spectral data from the International Glazing Database (IGDB) and models complex or shading layers using BSDF data from the Complex Glazing Database (CGDB). This enables accurate, angle-dependent analysis of systems like venetian blinds, draperies, and screens. The software links with THERM for detailed frame and edge-of-glass calculations, generates NFRC-compliant reports, and can export data for use in energy modeling tools such as EnergyPlus and DOE‑2. Teams use WINDOW 6.3 to compare design options, support code compliance and rating submittals, and optimize comfort and energy performance before prototyping.
Window6.3 is developed by LBNL and is used by 3 users of Software Informer. The most popular version of this product among our users is 6.3. The name of the program executable file is W6.exe.
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