Transparent Coating System for Greenhouse Solar Spectrum Filtering
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Solution Overview
Problem
Current greenhouse coatings either provide excellent control over the visible light spectrum but lack NIR reflectance, or they enhance NIR reflectance but fail to achieve fine control over the visible light spectrum, which is necessary for efficient crop growth and temperature regulation in greenhouses.
Innovation Solution
A transparent coating system combining pearlescent pigments with transparent absorption pigments to achieve high control over both visible light transmission and reflection, while maintaining significant NIR reflectance, thereby optimizing the PAR spectrum and RFR ratio for plant growth and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional absorption pigments are used to control visible light spectrum, then spectral control precision is improved, but NIR reflectance deteriorates
Solution Approach 1:
The patent combines traditional absorption pigments with pearlescent pigments in a single coating formulation. The absorption pigment provides precise control over the visible spectrum through selective absorption, while the pearlescent pigment contributes NIR reflectance through its layered structure. This merging of two different pigment types allows the coating to simultaneously achieve both spectral control precision and NIR reflectance, resolving the technical contradiction between these two properties.
2Loss of energy
If pearlescent pigments are used to enhance NIR reflectance, then energy loss is reduced, but visible light spectrum control precision deteriorates
Solution Approach 1:
The coating system merges pearlescent pigments with traditional absorption pigments. The pearlescent pigment layer structure provides NIR reflectance, while the absorption pigment provides selective absorption in the visible range. By combining these two pigment types, the coating achieves both high NIR reflectance and precise visible spectrum control, resolving the contradiction between energy conservation and spectral precision.
3Productivity
If a coating filters green light to improve crop growth efficiency, then plant growth efficiency is improved, but transmission of useful light is reduced
Solution Approach 1:
The coating applies local quality by selectively filtering only the green portion of the spectrum (495-590 nm) while maintaining high transmission in other regions. The absorption pigment is chosen to have absorption characteristics that specifically target green wavelengths, allowing the coating to improve crop growth efficiency by reducing green light transmission without significantly impacting the transmission of blue and red light, which are also crucial for photosynthesis.
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 coating system offers customizable light transmission and reflection in the visible spectrum with high NIR reflectance, enhancing crop growth efficiency and temperature control in greenhouses by precisely filtering the solar spectrum, surpassing the limitations of existing technologies.
Implementation Method 1
Depending on the thickness of the inorganic coating, different wavelengths can be reflected or transmitted. This is due to constructive or destructive interference, which can amplify or negate the transmitted or reflected light.
Implementation Method 2
Traditional pigments and dyes typically generate color by absorption of certain wavelengths of light, while reflecting or transmitting other wavelengths.
Implementation Method 3
pearlescent pigments have been used to reduce the transmission of near-infrared light, thus producing a thermal insulation effect
Data Source
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AI summary
The present technology relates to a transparent coating system or film which comprises a transparent, polymeric material, one or more pearlescent pigments, and one or more transparent dyes. The coating may be used to give well-defined transmission and reflection spectra in the visible region while having a high degree of reflection in the NIR region.