![]() ![]() ![]() Both are shown in the NFRC label in Figure 2. SHGC is closely tied to third, optional NFRC rating called visible transmittance (VT). This is obviously a challenge, given that the entire point of windows is to let light travel through. SHGC represents the ability of a window to resist heat gain from radiation, like the sunlight in Figure 1. The National Fenestration Research Council (NFRC) mandates a second value alongside U-factor in its certification process, called the Solar Heat Gain Coefficient (SHGC). The U-factor is useful in evaluating window performance and making wise decisions when specifying components for a building, but it is only one piece of the puzzle. In my last blog post, I wrote about the conduction and radiation of thermal energy through windows and the thermal transmittance value, called the U-Factor, that characterizes that heat transfer. Conduction and Radiation of Thermal Energy ![]()
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