NFRC 200-2010[E0A0] Procedure for Determining Fenestration Product Solar Heat Gain Coefficient and Visible Transmittance at Normal Incidence
NFRC
2010
National Fenestration Rating Council, Silver Spring, MD
NFRC, (2010), "NFRC 200-2010[E0A0] Procedure for Determining Fenestration Product Solar Heat Gain Coefficient and Visible Transmittance at Normal Incidence", National Fenestration Rating Council, Silver Spring, MD.
| Abstract: |
| PURPOSE: To specify a method for calculating Solar Heat Gain Coefficient (SHGC) and Visible Transmittance (VT) at normal (perpendicular) incidence for fenestration products containing glazings or glazing with applied films, with specular optical properties calculated in accordance with ISO 15099 (except where noted) or tested in accordance with NFRC 201. [Note 1.: This standard specifies a method for calculating the solar heat gain and visible transmittance from direct solar radiation through most fenestration products at normal incidence only. This procedure is limited to normal incidence calculations because solar optical data needed for such calculations is typically only available at normal incidence. While solar radiation rarely enters a fenestration product at normal incidence, solar heat gain coefficients and visible transmittance at near normal angles of incidence (less than 30 degrees off normal) are typically very similar to those at normal incidence; for other angles, the solar heat gain coefficients and visible transmittance at normal can be used, to first order, as an indicator of the relative magnitude of solar heat gain and visible transmittance.] |
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