In low-e glass, is infrared able to reach the low-e coating?

AI Thread Summary
Low-e coatings in double glazing are designed to reflect long wavelength infrared rays (LWIR), but glass itself absorbs LWIR, which complicates this function. Thermal imaging cameras cannot penetrate glass, indicating that LWIR is not transmitted effectively. The discussion centers on whether LWIR can reach the low-e coating given that the glass absorbs it. This raises questions about the actual energy-saving effectiveness of low-e coatings in reflecting LWIR. Ultimately, the interaction between glass and LWIR challenges the intended benefits of low-e coatings.
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A low-e coating in double glazing should reflect long wavelength infrared rays (LWIR, 8-15 µm). However, glass absorbs LWIR. (For example, thermal imaging camera's cannot see through glass.) Are long wave infrared rays able to reach the low-e coating?
 
Let me rephrase the question by redrawing a diagram that is sometimes used to explain low-E double paned windows. The low-E coating at surface #3 supposedly saves energy by reflecting LWIR (long wavelength infrared). My question is: glass absorbs LW-IR. Doesn't that prevent the reflection of LW-IR by the coating?

doublepane2.png
 

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