Development of an energy-saving glass using two-dimensional periodic nano-structures

•Energy-saving glass has high transmittance in visible while filters out IR light.•We use GA combined with RCWA to optimize 2D nano-structures for energy-saving glass.•Optimized structures have high TVIS for lighting and high RIR for low-cost air-condition. A new type of energy-saving glass, Ag inla...

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Bibliographic Details
Published in:Energy and buildings 2015-01, Vol.86, p.589-594
Main Authors: Huang, Chih-Ling, Ho, Chi-Chun, Chen, Yu-Bin
Format: Article
Language:English
Subjects:
Algorithms
Buildings
Cost engineering
Energy conservation
Energy-saving glass
Glass
Lighting
Nanostructure
Periodic nano-structures
Silicon dioxide
Sunlight
Wavelength-selectivity
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Summary:•Energy-saving glass has high transmittance in visible while filters out IR light.•We use GA combined with RCWA to optimize 2D nano-structures for energy-saving glass.•Optimized structures have high TVIS for lighting and high RIR for low-cost air-condition. A new type of energy-saving glass, Ag inlaid with SiO2 nano-structures (Inlay SiO2), is numerically developed here to offer modern buildings a passive but promising way of saving power under sunlight. The profile of glass is identified after optimizing optical responses using the genetic algorithm and a fitness function. Wavelength-selective reflectance (R) and transmittance (T) are demonstrated with validated programs based on the rigorous coupled-wave analysis algorithm. The high T and low R in the visible range not only saves energy for lighting but diminishes reflected and stray light. The low T and high R in the near-infrared reduce the cost for air-conditioning. Besides the cost can be further reduced, the superiority of this glass over current commercially available products includes the material commonness, light weight, and freedom from adhesion as well as oxidation. The fabrication tolerance of each dimension is further investigated to determine the key one. Other structure configurations are also approached to explore possibilities of alternates.
ISSN:0378-7788
DOI:10.1016/j.enbuild.2014.10.048