Passive freezing desalination driven by radiative cooling

Xin Huang, Jyotirmoy Mandal, Jin Xu, Aaswath P. Raman

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Increasing water scarcity in the face of climate change has driven significant interest in finding low-carbon-intensity ways of generating fresh water from saline sources. Conventional membrane and thermal desalination techniques require large energy inputs that can become prohibitive as salinity increases. Alternatively, solar desalination is a well-developed passive evaporative approach but is limited seasonally and geographically by solar insolation. Here, we propose and demonstrate a passive approach to a more thermodynamically attractive phase change that can also enable desalination: freezing. We develop a system that uses passive radiative cooling to the ultimate heat sink, outer space, to freeze and desalinate salt water. We experimentally demonstrate the passive desalination of 37.3 g/L salt water to 1.88 g/L after two radiative cooling-driven freezing desalination stages with 50% recovery and 17.5 g/L salt water to 0.7 g/L with 65% recovery. Our results highlight the potential of harnessing untapped thermodynamic resources for water technologies.

Original languageEnglish (US)
Pages (from-to)2762-2775
Number of pages14
JournalJoule
Volume6
Issue number12
DOIs
StatePublished - Dec 21 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Energy

Keywords

  • decarbonization
  • desalination
  • energy-water nexus
  • freezing desalination
  • radiative cooling
  • renewable energy
  • thermal desalination
  • water treatment

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