Half a croissant, on a plate, with a sign in front of it saying '50c'
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Like gliding backwards through porridge.

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Solar absorption refrigerator

Low-tech solar refrigeration
 
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Absorption refrigerators are really interesting. It seems counterintuitive that you can use a heat source to drive a cooling cycle, but there are many examples. Caravans and motorhomes often have propane-powered fridges. A small flame drives an evaporation-absorption cycle that removes heat from the interior - see Einstein-Szilárd fridge patent for an example.

Perhaps not a new idea, (I have looked and found people talking about building one) but I’ve not seen one working - I’m sure you’ll all put me right in no time!

A solar collector focuses heat onto a regenerator, driving a (for instance) low-pressure ammonia refrigeration cycle.

No pumps, electronics, moving parts.

Low tech, cheap working fluids, ideal for remote, sunny locations - perhaps temperature-sensitive medical supplies in remote places.

I’m vaguely hoping to build a prototype and produce free build plans for developing nation uses - Apropriate Technology.

Frankx, Oct 15 2019

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       Yes, it's Baked. But because of the energy source, it only works effectively for half the day - unless you have something like a molten salt reservoir.   

       That means bulk and cost, to deliver functionality that can be better achieved with a battery, a photovoltaic collector, and a compressor heatpump - which is much more energy-efficient for the same cooling transfer.
8th of 7, Oct 15 2019
  

       //Appropriate Technology// You need to talk to the Chinese - they've been appropriating technology for a couple of decades now.
MaxwellBuchanan, Oct 15 2019
  

       [MaxwellBuchanan] I read an article a while ago that suggested that, because of the rampant "reverse engineering" and blatant copying of others' designs, Chinese engineers aren't actually taught how to innovate; and as such, they don't know how to come up with their own original ideas. (It is probably a load of rubbish, but it makes a good story...)
(On that note, I wonder if the Great Firewall of China lets the halfbakery through?)
neutrinos_shadow, Oct 15 2019
  

       Not now it doesn't.
MaxwellBuchanan, Oct 15 2019
  

       Hmm.
How do you say "Sorry, won't happen again!" in Mandarin?
neutrinos_shadow, Oct 15 2019
  

       So, we should simply place all of our technological breakthroughs on website servers laced with pro- democracy / Falun Gong / Tibet / Uyghur / Hong Kong freedom movement /Tienanmen Square propaganda...
RayfordSteele, Oct 16 2019
  
      
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