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Tue Apr 16, 2019, 01:47 PM

Solar evaporator offers a fresh route to fresh water

https://eng.umd.edu/news/story/solar-evaporator-offers-a-fresh-route-to-fresh-water
Solar evaporator offers a fresh route to fresh water

About a billion people around the world lack access to safe drinking water. Desalinating salty water into drinkable water can help to fill this dangerous gap. But traditional desalination systems are far too expensive to install and operate in many locations, especially in low-income countries and remote areas.

Now researchers at the University of Maryland’s A. James Clark School of Engineering have demonstrated a successful prototype of one critical component for affordable small-scale desalination: an inexpensive solar evaporator, made of wood. The evaporator generates steam with high efficiency and minimal need for maintenance, says Liangbing Hu, associate professor of materials science and engineering and affiliate of the Maryland Energy Innovation Institute.


A self-cleaning device made of wood aims to make small-scale desalination more practical. Photo: John T. Consoli

The design employs a technique known as interfacial evaporation, “which shows great potential in response to global water scarcity because of its high solar-to-vapor efficiency, low environmental impact, and portable device design with low cost,” Hu says. “These features make it suitable for off-grid water generation and purification, especially for low-income countries.”

Interfacial evaporators are made of thin materials that float on saline water. Absorbing solar heat on top, the evaporators continuously pull up the saline water from below and convert it to steam on their top surface, leaving behind the salt, explains Hu, who is senior author on a paper describing the work in Advanced Materials.

https://dx.doi.org/10.1002/adma.201900498

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Reply Solar evaporator offers a fresh route to fresh water (Original post)
OKIsItJustMe Apr 2019 OP
zipplewrath Apr 2019 #1

Response to OKIsItJustMe (Original post)

Tue Apr 16, 2019, 02:22 PM

1. Old survival technique

Dig a hole, put a bucket in it. Cover is plastic sheet, preferably clear. When sunset comes, cooling air will cause the warm air in the hole to condense on the sheet. With a rock in the middle of it, the water will run down and drip into the bucket. Alternately you can fill the hole with some water. It evaporates and then condenses on the sheet.

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