Planar Heating Composite Sheet with Aerogel Insulation
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Solution Overview
Problem
Existing snow melting pavement technologies face inefficiencies in heat transfer and maintenance due to heat loss into the ground and damage from asphalt concrete or equipment loads, leading to delayed snow removal and increased maintenance costs.
Innovation Solution
A planar heating composite sheet comprising a base sheet with electrodes and conductive paste for heat generation, a heat insulating layer with aerogel-impregnated non-woven fabric, and a protective layer to prevent heat loss and structural damage, allowing for efficient heat transfer to the road surface and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heating cables are buried 5 to 10 cm from the surface of the asphalt concrete pavement layer, then the heating cables are protected from damage, but most of the heat is transferred downward and lost in the ground, resulting in insufficient heat transfer to the road surface
Solution Approach 1:
The patent introduces a heat insulating layer as an intermediary between the heating element and the ground. This layer acts as a thermal barrier that prevents heat from being transferred downward into the ground, thereby reducing heat loss while allowing the heating cable to be buried at a protective depth without compromising heat transfer efficiency to the road surface.
Solution Approach 2:
The patent employs composite material structures including heat insulating materials with specific thermal conductivity properties. By combining materials with different thermal characteristics (insulating layer with low thermal conductivity, asphalt concrete with moderate thermal conductivity), the system achieves both protection of the heating cable and efficient upward heat transfer to the road surface.
2Reliability
If heating cables are arranged in a staggered pattern on a metal frame, then the heating coverage is improved, but maintenance costs increase due to frequent re-construction as the heating cables are damaged by asphalt concrete or equipment load during construction and wheel load after construction
Solution Approach 1:
The patent merges the heating cable protection function with the existing pavement structure by integrating the heating element into the asphalt concrete layer itself. This combination eliminates the need for separate protective measures like metal frames, reducing installation complexity while maintaining cable durability against construction loads and wheel traffic.
Solution Approach 2:
The patent uses flexible heating cable configurations that can be embedded within the asphalt concrete matrix. The asphalt concrete itself acts as a protective medium, distributing and absorbing mechanical stresses from construction equipment and vehicle loads, thereby protecting the flexible heating cables from damage while maintaining heating effectiveness.
3Use of energy by moving object
If multiple operations are performed including forming grooves, removing dust, installing insulators, receiving members, heating cables, and filling with thermal conductive resin, then heat transfer efficiency is improved, but the installation work becomes cumbersome and requires a lot of time
Solution Approach 1:
The patent performs preliminary actions by pre-positioning the heating cables within the asphalt concrete pavement layer during the initial pavement construction process. This eliminates the need for subsequent complex installation operations such as groove formation, dust removal, and multiple component installations, significantly reducing installation time and complexity while maintaining effective heat transfer.
Solution Approach 2:
The patent integrates multiple functions into the asphalt concrete pavement structure itself. The asphalt concrete layer simultaneously serves as the protective medium, the thermal conductive medium, and the structural layer, eliminating the need for separate insulators, receiving members, and thermal conductive resin fillers required in conventional multi-step installation methods.
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 planar heating composite sheet significantly enhances snow melting efficiency and reduces power consumption by minimizing heat loss into the ground and preventing damage from construction loads, resulting in faster snow melting and lower maintenance costs.
Implementation Method 1
a conductive paste coated entirely between the plurality of electrodes on the upper surface of the base sheet and generating heat by electrical resistance
Implementation Method 2
a heat insulating layer including a heat insulating sheet attached to a lower portion of the planar heating layer and including a non-woven fabric impregnated with aerogel
Implementation Method 3
a heat insulating sheet attached to a lower portion of the planar heating layer and including a non-woven fabric impregnated with aerogel
Data Source
AI summary
The present embodiment relates to a planar heating composite sheet including: a planar heating layer including a base sheet having a predetermined width and length, a plurality of electrodes coated to an upper surface of the base sheet along a width direction of the base sheet, with different polarities being alternately arranged at regular intervals along a length direction of the base sheet, a conductive paste coated entirely between the plurality of electrodes on the upper surface of the base sheet and generating heat by electrical resistance, and an insulating sheet made of a synthetic resin material and attached to an upper portion of the conductive paste; and a heat insulating layer including a heat insulating sheet attached to a lower portion of the planar heating layer and including a non-woven fabric impregnated with aerogel, and a protective sheet made of a synthetic resin material.