Spectrally Selective Technology represents an advanced glazing system designed to selectively permit specific portions of the solar spectrum to enter a building while blocking others. This high-performance glass allows maximum visible light transmission while minimizing the heat gain from solar radiation. Such glass effectively reduces heat transfer into buildings and enables occupants to minimize artificial lighting by utilizing natural daylight. Consequently, it significantly reduces energy consumption and cooling demand within buildings. This type of glass is characterized by its clear transparency, allowing substantial daylight penetration and offering expansive outdoor views, while providing energy savings comparable to traditional reflective glass technology.
In Figure 1, the red line depicts the percentage of solar radiation transmission at various wavelengths through "ordinary glass." Different wavelengths of solar radiation are transmitted through the glass at varying degrees. For instance, radiation at a wavelength of 500 nanometers (visible light) is transmitted at about 85%, whereas radiation at 1000 nanometers (infrared) is transmitted at 70%.
The blue graph illustrates the percentage of solar radiation transmission at various wavelengths through LAMKOOL glass, which possesses radiation-filtering properties. It shows that wavelengths between 380-780 nanometers are transmitted at relatively high levels (50-70%), indicating substantial visible light penetration. However, beyond 780 nanometers, transmission decreases progressively; at 1000 nanometers, transmission is 20%, and at 1500 nanometers, it drops to 10%, reaching nearly 0% at 2000 nanometers. Thus, LAMKOOL glass exhibits superior heat reduction performance compared to ordinary glass.
Figure 2 compares the solar spectrum transmission through various types of glass. It is observed that LAMKOOL glass outperforms ordinary glass, Low-E glass, and reflective glass in blocking infrared radiation. Therefore, LAMKOOL glass contributes to a cooler indoor environment (for more on infrared radiation and thermal comfort, see here). However, when considering the energy-saving potential associated with cooling loads, the overall impact of heat gain from all sources must be comprehensively assessed.