Composite Heat Dissipation Structure for Daytime Radiative Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional heat dissipation devices rely on single mechanisms of thermal conduction, convection, or radiation, which are inefficient and not durable, especially in addressing the need for effective heat dissipation during strong thermal radiation periods like daytime, and contribute to energy consumption and greenhouse gas emissions.
Innovation Solution
A composite heat dissipation device utilizing a polar dielectric material assembly with sub-wavelength structures that interact with solar radiation to scatter light and enhance thermal radiation, incorporating optical and acoustic phonons for efficient heat transfer, allowing for multi-directional heat dissipation and increased emissivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional heat dissipation devices utilize only one mechanism (thermal conduction, thermal convection, or thermal radiation), then the device structure is simple, but the heat dissipation efficiency is insufficient especially during daytime with strong thermal radiation
Solution Approach 1:
The patent combines multiple heat dissipation mechanisms (thermal radiation, thermal conduction, and thermal convection) into a single integrated device. The polar dielectric material layer enables strong thermal radiation, while remaining in thermal contact with the heat source for conduction, and allowing air flow for convection, thereby achieving multi-mechanism heat dissipation simultaneously to improve efficiency without requiring separate devices
Solution Approach 2:
The patent employs a composite structure consisting of a polar dielectric material (such as polyvinylidene fluoride or polytetrafluoroethylene) combined with heat dissipation fins. This composite design leverages the high radiation emissivity of the polar dielectric material while maintaining structural integrity and enabling multiple heat transfer pathways, thereby resolving the contradiction between enhanced heat dissipation performance and device complexity
2Productivity
If radiative heat transfer materials are used to enhance thermal radiation, then heat dissipation capability is improved, but the materials are not durable and incapable of fulfilling need in the daytime
Solution Approach 1:
The patent selects polar dielectric materials with specific properties (high radiation emissivity, chemical stability, and thermal resistance greater than 0.1 m²K/W) to maintain durability under daytime conditions. By changing the material parameters to meet these criteria, the device achieves both enhanced heat dissipation capability and sufficient durability for daytime operation
Solution Approach 2:
The patent applies the polar dielectric material specifically as a surface layer or coating on the heat dissipation fins, concentrating the radiative heat transfer function where it is most needed while the underlying fin structure provides mechanical strength and durability. This localized application maintains material durability while achieving superior heat dissipation performance
3Ease of manufacture
If conventional materials are used for heat dissipation, then the device is easy to manufacture, but the materials cannot effectively scatter solar radiation or enhance thermal radiation
Solution Approach 1:
The patent specifies polar dielectric materials with particular properties (emissivity greater than 0.8, specific thermal resistance, and chemical stability) that can be manufactured using conventional processes. By defining clear material parameter ranges, the patent enables manufacturers to select from available materials that meet these criteria, maintaining ease of manufacture while achieving superior heat dissipation performance through enhanced solar radiation scattering and thermal radiation emission
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 device achieves high reflectivity for solar radiation, high emissivity for thermal radiation, and low thermal resistance, effectively dissipating heat during the day with improved durability and reduced energy consumption.
Implementation Method 1
surfaces of the polar dielectric material units each are configured to interact with the solar radiation to generate scattering of light
Implementation Method 2
the polar dielectric material units each include an optical phonon configured to interact with thermal radiation to increase strength of the thermal radiation
Implementation Method 3
the polar dielectric material units each further comprise an acoustic phonon, and the acoustic phonons are configured to transfer heat therebetween
Data Source
AI summary
A composite heat dissipation device includes an electromagnetic radiation dissipation pile including a polar dielectric material assembly including a plurality of polar dielectric material units. The polar dielectric material assembly is configured to interact with solar radiation. Surfaces of the polar dielectric material units each are configured to interact with the solar radiation to generate scattering of light. The polar dielectric material units each include an optical phonon configured to interact with thermal radiation to increase strength of the thermal radiation.