Yissum - Research Development Company of the Hebrew University

Gridless Water Generation from Ambient Air

Posted by Yissum - Research Development Company of the Hebrew UniversityResponsive · Innovative Products and Technologies · Israel

Summary of the technology

Gridless Water Generation from Ambient Air
Project ID : 47-2019-10796

Yissum - Research Development Company of the Hebrew University

Description of the technology


Cleantech, Environment,


Water, Gridless, Sustainability, Low Carbon, Circular Economy

Current development stage

TRL3 Experimental Proof of Concept


Water scarcity is a pressing global concern and the availability of clean water and sanitation is one of the United Nations’ 17 sustainable development goals. Reports show that over half of our planet’s population suffers from water shortages for at least one month a year. Air-water-generation is a compelling approach because water vapor is intrinsically renewable, local and potable. Passive methods are of immense value because they do not require power to drive water generation. Currently, maximum yields for passive devices are unacceptably low, ranging up to 0.6L/m2 a day.

Our Innovation

  • A novel device architecture for passive radiative cooling that overcomes parasitic effects and confounding functions
  • A system whereby the new theoretical upper limit for daily water generation is between 2-3 L/m2
  • The system hardware does not use external power; its carbon footprint is effectively zero


The research group has proposed a new system design that surpasses previously projected theoretical yields, by separating the radiative emitter and the dew collector. The proof-of-concept validated the model when tested under lab conditions.

The operating costs of such a device approach zero, limited to the cleaning of parts and surfaces. There are no moving parts in the final design.


There is a constant need for access to potable, low-cost and carbonless water. Technologies that can do so at local scale will be of perennial interest. Such a technology may be combined with other systems (e.g. local gardens) to provide a source of low-cost, clean water.

Project manager

Matt Zarek

Project researchers

John Howell
HUJI, Faculty of Science
The Racah Institute of Physics

Related keywords

  • Environment
  • Clean Production / Green Technologies
  • Waste Management
  • Protecting Man and Environment
  • Water Management
  • Drinking Water
  • Wastewater Recycling
  • Pollution and Recycling Related
  • Water technologies
  • Cleantech & Environment

About Yissum - Research Development Company of the Hebrew University

Technology Transfer Office from Israel

Yissum Research Development Company of the Hebrew University of Jerusalem Ltd. Founded in 1964 to protect and commercialize the Hebrew University’s intellectual property. Ranked among the top technology transfer companies, Yissum has registered over 8,900 patents covering 2,500 inventions; has licensed out 800 technologies and has spun-off 90 companies. Products that are based on Hebrew University technologies and were commercialized by Yissum generate today over $2 Billion in annual sales.

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