DIY Air Conditioner

I haven't tried it but air is a very bad heat conductor. It wouldn't be easy to have a temperature difference that is high enough between air and the temperature of the flowing water to transfer heat efficiently. It should work, but not very efficient. Can i suggest a possible improvement? I don't really have the money to buy the materials but I can try draw it. Not sure if it will work.

My idea is to connect the back part of the fan to a chamber with a cross sectional area bigger than fan. That way, the air that is sucked into that chamber should be moving slower than the air that is ejected at the blades. The copper tubing should be in this chamber. So there's more time for the heat transfer and this may result in a higher efficiency. The chamber is still needed to contain the cooled air rather than going to waste into the atmosphere. And it should be a good insulator. Maybe a cardboard box?

On second thought, I think the cold tubing may also cause water to condense. Maybe should also place a tray to collect the water somewhere below a tubing?

Now this got me thinking. Is there an easy way to cool air without ice?

Yes, this would work. It wouldn't freeze you out, but it's definitely better than nothing. I've been doing a lot of geothermal heating/cooling jobs recently, and air/water heat exchange is the driving force behind systems like this. There's an A/C Compressor/ heat pump in there to do the heat or cool top off and an electric heat element to compensate on those 5 degree nights, but mainly it's the water to air heat exchange that makes it so energy friendly.

Anything cooler than the ambient air will cause condensation and will require a drain (Depending on humidity/ dewpoint).

Adding surface area to an air-to-fluid heat transfer device is always more efficient than adding insulation, but insulation is easier to do per man-hour.

Cheers