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Innovation By Design

A Simple Solar Oven Makes Salt Water Drinkable

Gabriele Diamanti hopes to see local craftsmen all over the world adapt his design.

  • <p>Gabriele Diamanti’s Eliodomestico is an open-sourced project designed to transform salt water to fresh water for people in developing countries.</p>
  • <p>Though Diamanti used terra cotta for a large portion of the design, that could be changed to accommodate material availability in other regions.</p>
  • <p>Salt water is poured into the black, watertight boiler in the morning.</p>
  • <p>During the day, steam condenses, and is forced down the nozzle into the lid below.</p>
  • <p>This basin, which holds the clean water, was designed to be carried on the head.</p>
  • <p>Up to five liters of clean drinking water can be produced daily.</p>
  • <p>Diamanti hopes that craftspeople will adapt his design to suit their region.</p>
  • 01 /07

    Gabriele Diamanti’s Eliodomestico is an open-sourced project designed to transform salt water to fresh water for people in developing countries.

  • 02 /07

    Though Diamanti used terra cotta for a large portion of the design, that could be changed to accommodate material availability in other regions.

  • 03 /07

    Salt water is poured into the black, watertight boiler in the morning.

  • 04 /07

    During the day, steam condenses, and is forced down the nozzle into the lid below.

  • 05 /07

    This basin, which holds the clean water, was designed to be carried on the head.

  • 06 /07

    Up to five liters of clean drinking water can be produced daily.

  • 07 /07

    Diamanti hopes that craftspeople will adapt his design to suit their region.

"Projects ‘for the 90%’ mostly fall somewhere between two extremes: charity and business," designer Gabriele Diamanti tells Co.Design. "Neither was my inspiration!" Instead, spurred on by his own extensive travel and friends’ involvement in NGOs, he developed a fascination with global water scarcity as a graduate student at Milan Polytechnic in 2005; he recently decided to pursue his interest again and the result is Eliodomestico, an open-source variation on a solar still.

It functions by filling the black boiler with salty sea water in the morning, then tightening the cap. As the temperature and pressure grows, steam is forced downwards through a connection pipe and collects in the lid, which acts as a condenser, turning the steam into fresh water. Once Diamanti established the fundamentals were sound, he experimented with a series of concepts for the aesthetic of the object. "My goal was to design something friendly and recognizable for the users," he explains. "The process developed quite naturally to determine the current shape; every detail is there for a reason, so the form, as well as production techniques, represent a compromise between technical and traditional." Primary field studies in sub-Saharan Africa revealed the habit of carrying goods on the head—also a common practice in other areas around the world—and this was integrated into Eliodomestico’s plan. And while solar stills aren’t a totally new concept, Diamanti says it’s rare to find them in a domestic context rather than in missions or hospitals, or as large plants overseen by qualified personnel that serve entire communities. "I tried to make something for a real household that could be operated directly by the families," he says.

The project recently won a Core77 Design Award for Social Impact; already, Diamanti has received international feedback, and hopes to see locals adapt and modify the design to take advantage of their own readily available materials and native environments. "The idea is that instructions for the project can be delivered to craftsmen" with the help of NGOs, he says, then a micro-credit program could be established to finance small-scale start-ups specializing in production. "So the NGO is the spark, micro-credit is the fuse, the local craftsmen are the bomb!"

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