Alginate Biopolymeric Coated Heat Exchanger for Atmospheric Water Harvesting

Vincenzo Gentile, Michael Bozlar, Matteo Calò, Marco Simonetti, Forrest Meggers

Research output: Contribution to journalArticlepeer-review


We present a new type of sorbent material involving an aluminum heat exchanger coated with a hydrophilic alginate biopolymer hydrogel for atmospheric water harvesting (AWH). The hydrogel-coated heat exchanger is tested in a prototype driving cycle, collecting water over several days of continuous operation. The thermal cycle performance of the coating is tested in dry climates with relative humidity in the range of 30-50%. The new sorbent demonstrates regeneration temperatures between 60 and 80 °C, allowing efficient thermal cycles. The system allowed for a water yield of 2.48-3.3 L/kgHydrogel/day. The compactness of the coated heat exchanger, together with the performed daily water productivity, makes it compatible with applications integrating AWH technologies in the building sector.

Original languageEnglish (US)
Pages (from-to)1874-1882
Number of pages9
JournalACS ES and T Water
Issue number4
StatePublished - Apr 12 2024

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Water Science and Technology


  • alginate hydrogel coating
  • atmospheric water harvesting
  • biopolymer composite
  • diffusion kinetics
  • optimal cycle


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