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Daniel commented on Non Electrical Air Coolant Refrigerator

I like the simplicity of evaporative cooling based tech, but it does have a couple potential drawbacks.
Generally getting more than about a 10 C temp drop is a struggle, so tho it works well enough for prolonging the shelf life of plant produce, not necessarily advised for more spoilable items in hot climates. And high humidity pretty much kills the thing completely. Also goes through a fair amount of water.
In terms of living/growing space cooling I'm also working on a ground mass based air conditioning system which just involves pumping air through a 20 liter water container buried 1-2 meters in the ground where the temperature is usually stable and lowish day and year round. Doesn't work everywhere on earth, but is very simple and cheap, and requires very low power to run.

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Daniel commented on Non Electrical Air Coolant Refrigerator

Volume comes down to mostly to insulation, and 10cm of polystyrene would be easily sourced and keep things cold for a very long time...
Fruit and veg, animal products, vaccines, you name it really.

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Daniel commented on Non Electrical Air Coolant Refrigerator

Not yet a full prototype, but have proof-of-concepted it. But then the concept is adiabatic expansion, which isn't exactly novel.
In terms of power; to take 3 liters of air to 3 bar pressure in 1 minute takes about 7 watts (at 100% efficiency), so 30 watts should be a very safe figure. If the air is then allowed to cool back to 25 C before expanding back to atmospheric pressure it should come out at about -70 C (things get very cold through this process).
This much power can be easily generated by a small solar PV panel, a wind turbine / solar Stirling (both of which I'm also developing), other low to medium energy producing options.
For the compressor I was just going to make a little diaphragm pump from a food tin, some inner tube rubber, and two bike valves. Will likely need some adaptation in process but then everything does. Should last a while, and pretty much free to replace if and when it needs it.