Multilayer Ceramic Insulation for Radiant Burner Thermal Bridges
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Solution Overview
Problem
Radiant burners with two layers of screens suffer from thermal bridges and thermal losses due to metal connections, leading to inefficient energy radiation and early emitter failure.
Innovation Solution
A multilayer ceramic insulation structure that allows each screen layer to expand freely, reducing thermal bridges and incorporating smooth and profiled contacting surfaces, with the option of varying thickness and arrangement to optimize heat retention and assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal connections are used to hold radiant screens in place, then the screens are securely positioned, but thermal bridges and thermal losses occur causing early emitter failure
Solution Approach 1:
The patent introduces ceramic insulation layers as intermediary elements between the metal screen layers and the combustion chamber. These ceramic layers act as thermal barriers that prevent direct thermal contact, eliminating thermal bridges while maintaining structural support. The insulation layers mediate between the hot combustion environment and the cooler screen structures, preventing excessive heat transfer that would cause emitter failure.
Solution Approach 2:
The patent replaces metal mechanical connections with ceramic insulation support structures. Instead of using metal clips or fasteners that create thermal bridges, the screens are supported by ceramic insulation layers that provide mechanical support without conducting heat. This substitution eliminates the thermal bridge problem inherent in metal mechanical connections.
2Reliability
If a single layer of insulation is used, then the structure is simple to manufacture, but thermal protection is insufficient and one broken layer causes complete failure
Solution Approach 1:
The patent divides the insulation system into multiple separate ceramic insulation layers, each serving as an independent thermal barrier. This segmentation provides redundancy - if one layer is damaged, the other layers continue to provide thermal protection. The segmented structure also allows each layer to be manufactured and installed independently, simplifying the overall manufacturing process despite the increased number of components.
Solution Approach 2:
The patent implements multiple insulation layers as a preventive measure against thermal damage. This layered approach provides a buffer or cushion against heat transfer, and against potential damage to individual layers. The redundant layers ensure that thermal protection is maintained even when some layers are compromised, preventing complete system failure.
3Loss of energy
If uniform thickness insulation is used throughout, then manufacturing is simplified, but thermal protection is inefficient near the radiant burner plate where temperatures are highest
Solution Approach 1:
The patent applies insulation layers with varying thicknesses at different locations within the combustion chamber. The insulation is thickest near the radiant burner plate where temperatures are highest and thermal losses are most significant. The thickness gradually decreases toward the cooler upper regions. This local variation in insulation quality optimizes thermal protection where it is most needed while reducing unnecessary material in cooler zones.
4Ease of operation
If metal connections are used to assemble the burner, then assembly is straightforward, but thermal bridges cause increased thermal stresses and early failure
Solution Approach 1:
The patent employs composite construction combining metal screen layers with ceramic insulation layers. The metal screens provide structural framework and radiative surfaces, while the ceramic insulation layers provide thermal isolation. This composite structure allows for straightforward assembly of modular components while eliminating thermal bridges, as the ceramic layers break the thermal pathways that would otherwise exist through continuous metal connections.
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 enhances radiative output by minimizing thermal losses, maintaining operational efficiency even if one insulation layer is broken, and simplifies production and assembly while providing better insulation and a larger radiant surface.
Implementation Method 1
an insulation 7 lying under and extending downwardly from said upper flange 5 of said peripheral band 4. The insulation 7 has an internal peripheral structure permitting limited movement of the layers of screens 3
Implementation Method 2
The screen together with the radiant burner plate provides the radiative output of the burner, which amounts up to about 50% efficiency
Implementation Method 3
The insulation has an internal peripheral structure permitting limited movement of the layers of screens 3
Data Source
AI summary
A radiant burner (1) which comprises at least one radiant burner plate (2) and at least two layers of radiant screens (3) enclosed by a peripheral band (4) associated with a body (6) defining a premixing chamber for said burner. The peripheral band (4) comprises an upper flange (5). The radiant burner further comprises an insulation (7) lying under and extending downwardly from said upper flange of said peripheral band. The insulation (7) has an internal peripheral structure permitting limited movement of the layers of radiant screens (3). The insulation is a multilayer structure wherein each insulation layer engages and supports at least one screenlayer (3).