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A Facile and Effective Design for Dynamic Thermal Management Based on Synchronous Solar and Thermal Radiation
Na Guo1, Li Yu1,2, Changmin Shi3
1School of Energy Science and Engineering, Central South University, Changsha 430001, People's Republic of China.
Nano Letters
|January 22, 2024
Summary
This study introduces a novel polyethylene film for dynamic thermal management, switching between passive solar heating and radiative cooling modes using moisture. This innovation offers electricity-free temperature regulation and significant energy savings.
Area of Science:
- Materials Science
- Energy Science
- Sustainable Technology
Background:
- Passive solar heating and radiative cooling are key for reducing global energy consumption without electricity.
- Static systems cause issues like overcooling or overheating, necessitating dynamic solutions.
Purpose of the Study:
- To engineer a novel structured polyethylene (PE) film for switchable passive heating and cooling.
- To enable dynamic thermal management through a facile and effective approach.
Main Methods:
- A 100 μm polyethylene (PE) film was engineered with a switchable cooling and heating mode.
- A moisture transfer technique was employed to alter the film's properties.
- Solar and thermal modulation capabilities were characterized in dried and wetted states.
Main Results:
- The PE film demonstrated excellent solar modulation (0.92 to 0.32) and thermal modulation (0.86 to 0.05) via moisture transfer.
- Outdoor experiments confirmed effective thermal regulation during both day and night.
- The designed PE film has the potential to save 1.3-41.0% of annual energy consumption nationwide.
Conclusions:
- The developed PE film offers a promising dual-mode (cooling/heating) solution for energy-saving temperature regulation.
- This moisture-transfer-based mechanism provides a scalable approach for dynamic thermal management.
- The technology supports electricity-free, efficient building climate control.
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