Passive Radiative Coating for Cooler Overhead Conductors
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Solution Overview
Problem
Heat accumulation in overhead conductors and cables due to solar radiation and the Joule effect leads to reduced efficiency and shortened lifespan, posing challenges for critical electrical power and telecommunication applications.
Innovation Solution
A coating composition comprising specific fillers, binders, and surfactants is applied to overhead conductors and cables, enhancing thermal dissipation through passive heat management, thereby mitigating the effects of solar radiation and the Joule effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional coatings are applied to overhead conductors, then solar radiation resistance is improved, but thermal dissipation efficiency deteriorates
Solution Approach 1:
The coating applies different functional properties to different aspects of thermal management: solar reflective properties (high albedo) on the outer surface to reject incoming radiation, while maintaining thermal emissivity properties to facilitate heat radiation outward. This local differentiation of optical properties resolves the contradiction between solar resistance and thermal dissipation.
Solution Approach 2:
The coating uses a composite formulation combining binder materials with specific filler materials that provide both solar reflectivity and thermal emissivity. The composite structure enables simultaneous achievement of solar radiation resistance and effective thermal dissipation, overcoming the limitation of conventional single-function coatings.
2Temperature
If no coating is applied to conductors, then thermal dissipation is maintained, but conductor lifespan deteriorates due to heat accumulation
Solution Approach 1:
The coating converts the harmful effect of solar radiation into a beneficial thermal management system. By reflecting solar radiation and enhancing thermal emissivity, the coating transforms the previously harmful heat accumulation into an active heat dissipation mechanism, thereby extending conductor lifespan while maintaining thermal dissipation efficiency.
Solution Approach 2:
The coating modifies the optical and thermal parameters of the conductor surface: increasing solar reflectivity (albedo) and enhancing thermal emissivity. These parameter changes enable the conductor to actively manage heat by reflecting incoming solar radiation and radiating accumulated heat more efficiently, thus reducing operating temperature and extending service life.
3Temperature
If existing thermal control coatings are used, then temperature regulation is achieved, but effectiveness against solar radiation and Joule effect deteriorates
Solution Approach 1:
The coating provides multi-functionality by simultaneously addressing three heat sources: reflecting solar radiation (external heat), regulating conductor temperature (thermal management), and mitigating Joule effect heat (internal heat generation). This universal approach overcomes the limitation of existing coatings that only address single heat sources.
Solution Approach 2:
The coating optimizes specific optical parameters (solar reflectivity and thermal emissivity) to enhance effectiveness against multiple heat sources. By tuning these parameters, the coating achieves superior temperature regulation while simultaneously protecting against solar radiation and Joule effect, providing comprehensive thermal management for overhead conductors.
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 significantly reduces the temperature of conductors, improving thermal efficiency and extending the lifespan of conductors, which in turn enhances the reliability and stability of electrical and communication networks.
Implementation Method 1
The coating according to the present invention provides an effective solution to reduce heat accumulation, both from solar sources and Joule effect
Implementation Method 2
The coating composition comprising specific fillers, binders, and surfactants is applied to overhead conductors and cables, enhancing thermal dissipation through passive heat management
Implementation Method 3
heat accumulation in conductors, mainly caused by two predominant sources of heat: solar radiation and the Joule effect induced by electrical current
Data Source
AI summary
A “Passive Radiative Coating” (PRC) is designed to dissipate heat generated mainly by solar radiation, intended for use in the manufacture of overhead conductors and cables. Additionally, this coating can dissipate heat produced by the conductors themselves, known as the Joule effect, providing environmental protection and significantly improving heat dissipation capacity. The PRC is composed of at least one filler, at least one binder, and at least one surfactant. In particular, the use of calcium carbonate and/or barium sulfate as fillers, and epoxy resins, alkyd varnishes, polyurethane dispersions, casting resins, silicone-based varnishes, and sodium silicate as binders are highlighted. The surfactant is used to stabilize the mixture and acts as a stabilization additive.