This is an excellent set-up and the photographs and write-up show everything one needs to know to make a similar one. Thank you for posting, HT Acres.We just finished a fairly simple DIY evaporative cooling apparatus.
There is a bucket with a water supply and a small pump in it along with a float that stops the water to a certain fill line. The water is pumped up to a PVC pipe across the top that has holes drilled in it. It then runs down through the matting that is basically stuff that you replace in an evaporative cooler. It's squeezed between two pieces of cow panel. And lots of zip ties were used. Don't get too lost in all my technical terms! Haha
There is a larger PVC pipe at the bottom that has a slot cut in it that collects the water except what was lost through evaporation and returns it to the bucket. This apparatus works often by just the wind but we also have a large fan that we can use. We have a little more cleanup to do, hang it a little better etc, but it's working very well.
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~ Maggie