Novel Low-E filter for architectural glass pane

A good Low-Emissivity (Low-E) filter coated on glass reduces the amount of heat coming from solar light into the building, thus the expenses in electricity for air conditioning are reduced. Standard Low-E filters contain a Silver layer between two dielectric thin films due to its high reflectance of infrared wavelengths: however, one of the major silver drawbacks are its chemical and mechanical weakness which reduces the filter mean lifetime. In this paper, we investigate alternative materials to be a substitution of Ag, and they were compared with commercial filters. It was found that an aluminum-based filter has a good cost-benefit performance with peak transmittance better than 80% in the visible, while having less than 20% transmittance for wavelengths longer than 1500nm. A simulation of the filters construction was made providing a tolerance of each layer thickness, so the filter keeps its optical performance (C) 2019 Elsevier B.V. All rights reserved.