Particle-Solid Transition Architecture for Efficient Passive Building Cooling
Xiantong Yan1, Meng Yang2, Wenhui Duan3
1Key Laboratory for Resilient Infrastructures of Coastal Cities (MOE), College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China.
ACS Nano
|September 25, 2024
Summary
A new cementitious radiative cooling armor uses a particle-solid transition architecture for effective building cooling. This innovation enhances material compatibility and provides significant cooling power without electricity, paving the way for practical passive daytime radiative cooling (PDRC) applications.
Area of Science:
- Materials Science
- Sustainable Energy
- Building Physics
Background:
- Building cooling significantly contributes to global energy consumption and carbon emissions.
- Passive daytime radiative cooling (PDRC) offers an electricity-free solution but faces material compatibility challenges, especially with cementitious materials.
- Existing PDRC technologies often suffer from poor integration with building substrates like concrete.
Purpose of the Study:
- To develop a novel cementitious radiative cooling material compatible with building substrates.
- To overcome the limitations of existing PDRC materials regarding integration and durability.
- To achieve efficient passive cooling for buildings through an innovative architectural design.
Main Methods:
- Development of a particle-solid transition architecture (PSTA) for cementitious radiative cooling.
- Utilizing an all-inorganic material composition for UV resistance and substrate compatibility.
- Characterization of interfacial bonding strength, solar reflectance, and mid-infrared emittance.
Main Results:
- The PSTA demonstrated significantly enhanced interfacial shear strength (0.93 MPa) compared to control materials.
- Achieved a substantial subambient temperature drop of approximately 6.6 °C.
- Exhibited a cooling power of approximately 92.8 W/m² under direct solar irradiance (∼680 W/m²).
- The PSTA design ensures high solar reflectance and strong mid-infrared emittance.
Conclusions:
- The proposed cementitious radiative cooling armor effectively addresses material mismatch issues in PDRC applications.
- The PSTA design offers a scalable and practical approach for integrating PDRC technology into building materials.
- This advancement facilitates widespread adoption of passive cooling strategies for buildings, reducing energy consumption and environmental impact.
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