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Updated: Sep 16, 2025

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

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All-Day Freshwater Harvesting Using Solar Auto-Tracking Assisted Selective Solar Absorption and Radiative Cooling.

Jing Luo¹, Haining Ji¹, Runteng Luo¹

¹School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China.

Materials (Basel, Switzerland)

|July 12, 2025

Summary

This summary is machine-generated.

A new device combines solar absorption and radiative cooling for all-weather freshwater harvesting. Solar auto-tracking significantly boosts freshwater collection, offering a sustainable solution to water scarcity.

Keywords:

freshwater harvesting radiative cooling selective solar absorber solar tracking

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Area of Science:

Materials Science
Environmental Engineering
Sustainable Development

Background:

Global freshwater scarcity is a critical barrier to sustainable development.
Conventional water harvesting methods face geographical and environmental constraints.
Growing water demand necessitates innovative solutions.

Purpose of the Study:

To develop an all-weather freshwater harvesting device utilizing synergistic photothermal conversion and radiative cooling.
To enhance device efficiency through a solar auto-tracking system and a selective solar absorber.
To address the global freshwater crisis with a technically and economically viable solution.

Main Methods:

Designed a selective solar absorber with high absorptivity (0.91) and low emissivity (0.12).
Integrated a radiative cooling film achieving significant daytime (7.62 °C) and nighttime (7.03 °C) cooling.
Employed a solar auto-tracking system to optimize freshwater collection.

Main Results:

The selective solar absorber demonstrated enhanced photothermal conversion efficiency.
The radiative cooling film provided a stable low-temperature environment for condensation.
The solar auto-tracking system increased freshwater yield by 23.4% (0.79 kg m⁻² in 24 h).

Conclusions:

The developed device effectively harvests freshwater under various conditions.
The solar auto-tracking system significantly improves freshwater collection efficiency.
This technology offers promising solutions for emergency water supply and island communities, mitigating global water shortages.