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I am actually very interested in your project, as actually as of recently I have been doing my own research, and a few small experiments on solar fridges. So far I’ve decided if you could make a solar adsorption cooler, i think this would work really well. Have the sun heat up desicants such as silica, or zeolite so that you can induce evaporation. You could have the humid air that was evaporated go underground for condensation, where it can be stored and used for other purposes(if using water as your coolant) or it can be recirculated through the system.
Or you could have the humid air go to a seperate “tank” which is basically just an empty tank. You pump all the humid air into this empty , and as the sun sets and the ambient temperature drops, the water will condense. One way to think of that is take a regular old zeer pot for example. Now zeer pots work great, granted you live in a dry environment. If its humid, it won’t work as well. My idea would basically be take a zeer pot, and rather than set in “open air”, essentially put it in a larger sealed encassing, putting into a large sealed box. of course you want to make this tank as dry as possible beforehand. Now my idea is that the water in the sand will evaporate, making the air in the tank around the zeer pot humid. After so long the air in the tank around the zeer pot will become humid and it wont work so well, but hopefully that should be about the time the sun is setting. Once the sun sets, the ambient temperature will drop and the humid air should begin to condense. If this were to work, you could have zeer pots in humid environments.
Or, of course do the solar adsorption way, have one set of desicants being by the sun, while the other set is used to dry the air inside the fridge evaporator. I have more detailed ideas for how to do this, but i haven’t tested it and honestly I may have no useful ideas for.
I do not have any background in this, no formal schooling just interested in it so it would be great if you could tell me what are the flaws, drawbacks, inefficiencies of a system like this, as i haven’t been able to do much experimentation myself. But i would love to share more ideas if I actually say anything of use.