Designing Mesoporous Photonic Structures for High-Performance Passive Daytime Radiative Cooling

Meijie Chen, Dan Pang, Jyotirmoy Mandal, Xingyu Chen, Hongjie Yan, Yurong He, Nanfang Yu, Yuan Yang

Research output: Contribution to journalArticlepeer-review

115 Scopus citations

Abstract

Passive daytime radiative cooling (PDRC) has drawn significant attention recently for electricity-free cooling. Porous polymers are attractive for PDRC since they have excellent performance and scalability. A fundamental question remaining is how PDRC performance depends on pore properties (e.g., radius, porosity), which is critical to guiding future structure designs. In this work, optical simulations are carried out to answer this question, and effects of pore size, porosity, and thickness are studied. We find that mixed nanopores (e.g., radii of 100 and 200 nm) have a much higher solar reflectance R¯ solar (0.951) than the single-sized pores (0.811) at a thickness of 300 μm. With an Al substrate underneath, R¯ solar, thermal emittance ϵ¯ LWIR, and net cooling power Pcool reach 0.980, 0.984, and 72 W/m2, respectively, under a semihumid atmospheric condition. These simulation results provide a guide for designing high-performance porous coating for PDRC applications.

Original languageEnglish (US)
Pages (from-to)1412-1418
Number of pages7
JournalNano Letters
Volume21
Issue number3
DOIs
StatePublished - Feb 10 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • General Materials Science

Keywords

  • metamaterials
  • optical simulation
  • porous polymer
  • radiative cooling

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