Half a croissant, on a plate, with a sign in front of it saying '50c'
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Solar-Oven Atmospheric-Water Extractor

  [vote for,

This mechanism uses two sequential concurrent processes, each with its own working fluid:

Calcium Chloride - as solid granules or a saturated solution - picks up water directly from the atmosphere (through a fluidized bed or fountain spray), then releases it as vapor/steam in a solar-concentrator/oven, before flowing back around to the start of the process.

Humid air carries the steam from the oven, thence through a condenser which removes the water, and flows back to the oven for more.

CaCl is pretty much dirt cheap and available everywhere. It's also pretty caustic in concentrated form, though non-poisonous.

Since the target locales for such would be high insolation, it'd use a few solar panels to power the solar-tracking motors, desiccant pump, and the Raspberry Pi that tells you when your tea's done.

FlyingToaster, Feb 27 2017

Written as a complementary idea to radiative_20cooled_20water_20condenser
Night and Day [FlyingToaster, Feb 27 2017]

SOLAR DESICCANT AIR DEHUMIDIFIER https://www.youtube...watch?v=IMc2N25-nyc
Something like this ? [popbottle, Feb 27 2017]


       //Something like this ?// Well, the words "solar" and "desiccant" is in the title, so certainly... for a broad enough definition of "something".   

       I can't parse what he's saying in the video - where does the water come out ?
FlyingToaster, Feb 27 2017

       I've actually tried something very similar to this, but using magnesium chloride rather than calcium. Everything 'gunks up' pretty fast. And corrodes.
AusCan531, Feb 27 2017

       //gunks up//
Using a near-saturated solution as base in the desiccant loop, the gucking-up issues would only be due to dust, which - run through filter pores smaller than the spray nozzles - wouldn't cause any problems at low levels.

       There's still nightly downtime to clean the tanks and settle out suspended solids.   

       Leaving only dissolved solids - which in large enough amounts would interfere with the efficiency, but aren't otherwise much of a concern... maybe the desiccant (and baggage) is completely dried up and sent for recycling once a month, replaced by a clean batch.   

       Is MgCl any better ? I picked CaCl just because it sounds more innocuous (I use sand).
FlyingToaster, Feb 27 2017


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