Light Diffusing Solar Control Film for Glare Reduction
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Solution Overview
Problem
Conventional solar control methods that reduce solar heat gain and glare often diminish visible light transmission, leading to increased energy usage, especially under overcast skies, as they typically absorb or reflect a significant amount of visible light along with infrared radiation.
Innovation Solution
A light diffusing solar control film comprising a multilayer film that transmits visible light and reflects infrared light, integrated with a light diffusing layer or surface, providing a haze value of 10% or greater, which is applied to glass substrates to form solar control laminates and glazing units, ensuring improved interior illumination while minimizing unwanted solar gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional solar control methods (absorbing films and window shades) are used to reduce solar heat gain and glare, then solar heat gain is reduced, but visible light transmission is reduced by as much as 80%
Solution Approach 1:
The invention segments the solar spectrum into different wavelength ranges and applies selective control measures: a light diffusing layer handles visible light (400-700nm) to maintain illumination, while a separate infrared-reflective multilayer film handles thermal radiation (700nm-1mm) to reduce heat gain. This spectral segmentation allows independent optimization of each band without the trade-off present in conventional single-layer absorbing films.
Solution Approach 2:
The invention uses a composite structure combining two functionally distinct materials: a light diffusing layer (such as etched glass, frosted film, or polymer-based diffusers) that scatters visible light to maintain illumination, and a multilayer infrared-reflective film (comprising alternating layers of high and low refractive index materials) that reflects thermal radiation. The composite structure enables simultaneous achievement of glare reduction and visible light transmission that neither material could achieve alone.
2Loss of energy
If conventional solar control films are used to minimize solar gain, then energy efficiency is improved, but artificial lighting must be used under overcast sky which increases energy usage
Solution Approach 1:
The invention changes the optical parameters of the solar control film by incorporating a light diffusing layer that maintains high visible light transmission (greater than 70%, preferably greater than 80%). This parameter change ensures that sufficient natural light penetrates the glazing even under overcast conditions, eliminating the need for supplemental artificial lighting and avoiding the associated energy penalty.
3Loss of energy
If Low-e coatings are applied to reflect mid to far infrared energy, then insulating properties are improved, but the coatings are easily attacked by atmospheric elements such as moisture, salt and water
Solution Approach 1:
The invention replaces the fragile soft-coat Low-e coating with a more durable alternative: a multilayer infrared-reflective film that can be applied as a hard coat during glass manufacturing or as a robust polymer-based reflective layer. This substitution prioritizes long-term durability and resistance to atmospheric elements over the slightly superior initial performance of soft coats, aligning with the principle of using more robust, long-lasting materials.
Solution Approach 2:
The invention applies different protective qualities to different parts of the glazing system: the infrared-reflective multilayer film is positioned and designed to provide both optical functionality and environmental durability, while the light diffusing layer provides additional protection and aesthetic qualities. Each layer is optimized for its specific location and function within the glazing assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains high visible light transmission while reflecting at least 50% of infrared radiation, thereby reducing energy consumption by allowing natural light to illuminate building interiors while controlling solar heat gain.
Implementation Method 1
a multilayer film that transmits visible light and reflects infrared light
Implementation Method 2
The multilayer film that transmits visible light and reflects infrared light
Implementation Method 3
a light diffusing layer or surface is adjacent to the multilayer film
Implementation Method 4
The light diffusing layer or surface scatters light
Data Source
AI summary
A light diffusing solar control film includes a multilayer film that transmits visible light and reflects infrared light, and a light diffusing layer or surface adjacent to the multilayer film forming a light diffusing solar control film. The light diffusing solar control film has a haze value of 10% or greater.