Standard values for outdoor convective surface heat transfer coefficients is listed in Table 4-2; On the indoor side of a fenestration product, detailed radiation model, based on gray body radiation model as described in Section 8.4.2.1 in ISO 15099, shall be used for all products. This model applies to both glass and frame surfaces; The use of detailed radiation model on indoor fenestration surfaces makes the use of or partially ventilated cavities” “slightly on the indoor frame surfaces redundant (see Section 6.7.1 of ISO 15099). The standard frame convective film coefficients (hc) shown in Table 4-2 and detailed radiation model referenced above shall thus be applied to all interior frame surfaces; On the outdoor side of a fenestration product, black body radiation model (as defined in ISO 15099) shall be used. This model applies to both glass and frame surfaces; and All cross-sections shall include 150 mm (6 in) of glazing section from the sightline to the end of the glazing section, while maintaining a 63.5 mm (2.5 in) edge-of-glazing dimension. Table 4-2 Boundary Conditions – Convective Film Coefficient Boundary Boundary Tilt = 90o Tilt = 20o Condition W/m2K W/m2K (Btu/h·ft2·ºF) (Btu/h·ft2·ºF) NFRC 100-2001 26.00 (4.578) 26.00 (4.578) Exterior Interior 3.29 (0.579) 4.65 (0.819) Aluminum Frame (convection only) e Model Interior 3.00 (0.528) 4.09 (0.720) Thermally Broken (convection only) Model Interior 3.12 (0.549) 4.32 (0.761) Thermally Improved (convection only) Model Interior 2.44 (0.429) 3.09 (0.544) Wood/Vinyl Frame (convection only) Model Interior Glazing Depends on the WINDOW calculations for the System imported glazing system boundary condition Model
Standard values for outdoor convective surface heat transfer coefficients is listed in Table 4-2; On the indoor side of a fenestration product, detailed radiation model, based on gray body radiation model as described in Section 8.4.2.1 in ISO 15099, shall be used for all products. This model applies to both glass and frame surfaces; The use of detailed radiation model on indoor fenestration surfaces makes the use of “slightly or partially ventilated cavities” on the indoor frame surfaces redundant (see Section 6.7.1 of ISO 15099). The standard frame convective film coefficients (hc) shown in Table 4-2 and detailed radiation model referenced above shall thus be applied to all interior frame surfaces; On the outdoor side of a fenestration product, black body radiation model (as defined in ISO 15099) shall be used. This model applies to both glass and frame surfaces; and All cross-sections shall include 150 mm (6 in) of glazing section from the sightline to the end of the glazing section, while maintaining a 63.5 mm (2.5 in) edge-of-glazing dimension. Table 4-2 – Boundary Conditions Boundary Condition Convective Film Coefficient Boundary Tilt = 90o Tilt = 20o W/m2K (Btu/h·ft2·ºF) W/m2K (Btu/h·ft2·ºF) NFRC 100-2001 Exterior 26.00 (4.578) 26.00 (4.578) Interior Aluminum Frame (convection only) Model 3.29 (0.579) 4.65 (0.819) Interior Thermally Broken (convection only) Model 3.00 (0.528) 4.09 (0.720) Interior Thermally Improved (convection only) Model 3.12 (0.549) 4.32 (0.761) Interior Wood/Vinyl Frame (convection only) Model 2.44 (0.429) 3.09 (0.544) Interior Glazing System boundary condition Model Depends on the WINDOW calculations for the imported glazing system e
NFRC_100-2017_E0A0.docx