For the math fair at my university, I made the decision to try to make a makeshift cooling system; I got a few strange ideas online and then I knew what I would try to put together.
I particularly got a cooler that I would pack full of ice.
I got some copper tubing that I carefully bent into a spiral shape and linked it to a fan, however my whole reason for doing this was going to be to have a coil plan with cool water flowing through it, when the fan blew the air, the air would be cooled down because of the ice-cold water flowing through the tubing. I hooked the tubing up to a water pump and then I put the ice and the water in the cooler. I had the tubing connected so that the water would keep on recirculating back into the cooler. When I had my makeshift a/c plan laboring, I thought it was pretty good. It particularly was able to cool me down substantially. It actually worked a lot better than just the fan running on its own. When I had the makeshift cooling plan at the math fair, I particularly ended up winning 2nd site, the first venue project was pretty cool too. There was a woman that made a solar powered gas furnace. It worked pretty fantastic too, better than my makeshift cooling system; Not to mention, she was able to utilize the energy from the sun to make her work while I had to keep adding ice water to mine.