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Adhesive Hydrogel Paint for Passive Heat Dissipation via Radiative Coupled Evaporation Cooling
Qin Ye1, Daohui Chen1, Ziying Zhao1
1School of Energy Science and Engineering, Central South University, Changsha, 430001, China.
Small (Weinheim an Der Bergstrasse, Germany)
|March 10, 2025
Summary
This study introduces a novel hydrogel paint for passive cooling, combining radiative and evaporative cooling (REC). The innovative material offers enhanced heat dissipation, even in challenging environmental conditions, for effective outdoor cooling applications.
Area of Science:
- Materials Science
- Thermal Engineering
- Sustainable Energy
Background:
- Passive cooling technologies like radiative cooling (RC) and evaporation cooling (EC) are gaining interest for energy-free cooling.
- Single-mode passive cooling methods face limitations due to environmental factors like sunlight and humidity, restricting their performance.
- Existing methods struggle with consistent cooling across varying conditions, necessitating advanced solutions.
Purpose of the Study:
- To develop an adhesive hydrogel paint capable of multi-mode passive cooling for enhanced heat dissipation.
- To overcome the limitations of single-mode passive cooling by integrating radiative and evaporative cooling strategies.
- To enable self-replenishment of cooling capacity through moisture capture.
Main Methods:
- Design and synthesis of an adhesive hydrogel paint with high solar reflectance (0.91) and thermal emittance (0.94).
- Integration of radiative coupled evaporation cooling (REC) for daytime/high workload and RC-assisted adsorption for nighttime/low workload.
- Application of the hydrogel paint on a 3D W-shaped substrate to optimize cooling performance.
Main Results:
- The REC paint on a W-shaped substrate demonstrated superior passive heat dissipation compared to flat surfaces.
- A temperature drop of 5.4 °C at 100 W m⁻² and 11.4 °C at 400 W m⁻² was achieved.
- The material exhibited effective moisture capture for self-replenishment, enhancing long-term cooling potential.
Conclusions:
- The developed adhesive hydrogel paint effectively integrates multiple passive cooling strategies for superior heat dissipation.
- The structural design using a 3D W-shaped substrate significantly enhances cooling performance.
- This innovative material shows significant potential for outdoor passive cooling applications, addressing limitations of current technologies.
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