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A 20 gallon polyethylene tank, purchased from US Plastic, was used for this evaporative cooler build. While not cheap, the 3/16 inch wall thickness makes it possible to cut threads for fittings.







The tank has plenty of space for the two 10cm cooling fans mounted on the back.



Chlorox Handi-Wipes provide a large surface area for phase-change cooling. Velcro strips were sewn onto the ends of the wipes, so that they can be hung from the PVC drip tubes.



The acrylic cases for these flourescent light tubes were sealed with epoxy fillets, as were all the PVC joints; I'm a klutz with PVC cement, and it cures too fast for a project like this.



Dual pumps move water from the cooler in bathroom to the computer in the bedroom.



PVC tubes weighted with lead (Pb) birdshot cause the Handi-Wipe loops to maintain separation, and not stick together, thus increasing surface area and efficiency. The capped and sealed tube-ends, and water level, can be seen through the semi-transparent PE tank. Scraps of plastic tubing, cut lengthwise, are used to elevate the lid, allowing air from the back-mounted fans to exit between the lid and the tank; they can be seen in the full-sized version of the picture above.



Since I live in a dry climate, evaporative cooling works very well. This setup was completed 10 months ago; cooling performance is outstanding and near-silent (lights indicate when it's on), with no leaks, and no apparent microbiological issues on distilled water with biocide.
Edited by Sleeperman - 10/12/12 at 8:40am