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Updated: Nov 21, 2025

Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies

Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies

Published on: November 6, 2018

A structural polymer for highly efficient all-day passive radiative cooling.

Tong Wang¹, Yi Wu¹, Lan Shi¹

¹Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, 200433, Shanghai, China.

Nature Communications

|January 15, 2021

Summary

This summary is machine-generated.

This study introduces a novel polymethyl methacrylate (PMMA) film for highly efficient passive radiative cooling. The innovative material achieves significant subambient temperatures day and night, offering a low-cost solution for various climates.

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Area of Science:

Materials Science
Nanotechnology
Thermodynamics

Background:

Passive radiative cooling is a promising technology for sustainable temperature regulation.
Current radiative coolers face challenges in achieving high efficiency and low cost for all-day, all-climate applications.
Polymethyl methacrylate (PMMA) is a versatile polymer with potential for advanced optical applications.

Purpose of the Study:

To develop a highly efficient and low-cost passive radiative cooler for all-day and all-climate use.
To investigate the performance of a hierarchically structured PMMA film for radiative cooling.
To analyze the role of micro- and nanopores in enhancing cooling performance.

Main Methods:

Fabrication of a hierarchically structured PMMA film with a micropore array and random nanopores.
Characterization of optical properties: solar reflectance and longwave infrared thermal emittance.
Experimental measurement of subambient cooling performance under varying environmental conditions (day/night, solar intensity, humidity).

Main Results:

The PMMA film achieved a solar reflectance of 0.95 and thermal emittance of 0.98.
Subambient cooling of ~8.2°C at night and ~6.0°C to ~8.9°C during midday was realized.
Effective cooling (~5.5°C) was demonstrated even in hot and humid conditions (~930 W/m² solar intensity, ~64% relative humidity).
Average cooling power reached ~85 W/m² under ~900 W/m² solar intensity.

Conclusions:

Hierarchically structured PMMA films with tailored porosity offer a highly efficient solution for passive radiative cooling.
The combination of micropores and nanopores is crucial for optimizing solar reflectance and thermal emittance.
This technology presents a viable, low-cost approach for effective temperature regulation across diverse climates.