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Window 6.3 (USA)

Calculate total window thermal performance indices

WINDOW 6.3 is a publicly available (free) computer program for calculating total window thermal performance indices (i.e. U-values, solar heat gain coefficients, shading coefficients, and visible transmittances). WINDOW 6.3 provides a versatile heat transfer analysis method consistent with the updated rating procedure developed by the National Fenestration Rating Council (NFRC) that is consistent with the ISO 15099 standard. The program can be used to design and develop new products, to assist educators in teaching heat transfer through windows, and to help public officials in developing building energy codes.

WINDOW 6.3 offers the following features:
- The ability to analyze products made from any combination of glazing layers, gas layers, frames, spacers, and dividers under any environmental conditions and at any tilt; - The ability to model complex glazing systems such as venetian blinds and roller shades. bullet Directly accessible libraries of window system components, (glazing systems, glazing layers, gas fills, frame and divider elements), and environmental conditions; - The choice of working in English (IP), or Systeme International (SI) units; - Help Screens and a manual; - A print feature which generates detailed results for a window, window component, or library; -The ability to specify the dimensions and thermal properties of each frame element (header, sills, jamb, mullion) in a window; - A multi-band (wavelength-by-wavelength) spectral model; - A Glass Library which can access spectral data files for many common glazing materials from the Optics5 database; - A night-sky radiative model; - A link with the DOE-2.1E and EnergyPlus building energy analysis program.

Developed by Lawrence Berkeley National Laboratory