Infrared Radiator Emissive Layer on Metal Reflector
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Solution Overview
Problem
Infrared radiators with metal reflector layers suffer from limited thermal stability, requiring extensive cooling at high temperatures, which increases space requirements and can impair heating due to turbulence, and alternative materials like opaque quartz glass result in radiation losses due to diffuse reflection.
Innovation Solution
Applying an emissive layer with higher emissivity than the reflector layer over the metal reflector layer to enhance radiation efficiency and thermal stability, allowing for increased electrical power density operation without extensive cooling, using a black emissive layer with high emissivity (0.81 to 0.99) to increase radiation and reduce particle evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a metal reflector layer is applied to the radiator molded body, then the reflection of infrared radiation is improved, but the thermal stability deteriorates at high temperatures
Solution Approach 1:
The reflector system is segmented into two distinct layers: a metal reflector layer for high radiation reflection efficiency and an emissive layer for thermal stability. This segmentation allows each layer to perform its specialized function without compromising the other, resolving the contradiction between reflection efficiency and thermal stability.
Solution Approach 2:
The invention uses a composite structure combining a metal reflector layer with an emissive layer. The metal layer provides excellent infrared radiation reflection, while the emissive layer with high emissivity (0.81-0.99) enhances thermal radiation and stabilizes the system at high temperatures, achieving both reflection efficiency and thermal reliability.
2Reliability
If extensive cooling is applied to the reflector layer at high temperatures, then the thermal stability is improved, but the space requirements increase and turbulence impairs heating
Solution Approach 1:
The emissive layer enables the reflector system to self-regulate thermally by enhancing its own radiation capability. The high emissivity layer allows the reflector to dissipate heat through thermal radiation without requiring external cooling systems, making the system self-sufficient and eliminating the need for additional cooling space.
Solution Approach 2:
The invention replaces mechanical cooling systems (which require space and can create turbulence) with a thermal radiation-based solution. The emissive layer facilitates passive heat dissipation through radiation, substituting active mechanical cooling with a passive thermal field-based approach that eliminates space requirements and turbulence issues.
3Reliability
If opaque quartz glass is used instead of metal reflector layer, then the thermal stability is improved, but radiation losses occur due to diffuse reflection
Solution Approach 1:
The invention applies different material properties to different layers: the metal reflector layer provides specular reflection with high radiation efficiency, while the emissive layer provides high emissivity for thermal stability. This local differentiation of material qualities allows the system to achieve both low radiation loss and high thermal stability simultaneously.
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 emissive layer increases radiation efficiency, reduces the need for cooling, extends the service life of the reflector layer, and allows for higher electrical power density operation with reduced convection issues, enhancing the thermal stability and operational longevity of infrared radiators.
Implementation Method 1
Infrared radiators are designed to emit radiation in the infrared spectral range
Implementation Method 2
The emissive layer has an emissivity which is in the range of 0.81 to 0.99 in the wavelength range of 0.78 μm to 5 μm
Implementation Method 3
A specular reflector layer made of metal, in particular of gold, exhibits excellent properties with regard to the reflection of infrared radiation
Implementation Method 4
a heating tape arranged within a radiator pipe, or a heating coil, or a resistance element
Data Source
AI summary
Known infrared radiators have a radiator molded body with a reflector layer made of metal and applied thereto. Starting therefrom, in order to specify an infrared radiator which can be operated easily and cost-effectively and moreover over the longest possible period with a large electrical power density, it is proposed that an emissive layer with an emissivity that is greater over a wavelength range of 0.78 μm to 5 μm by at least a factor of 10 than the emissivity of the reflector layer at the same wavelength and temperature is applied to the reflector layer.