Thanks, the pepino is not my design, but a rough hack of the original.
The hexayurt (as you probably know) is pretty dust proof, and keeps a cooler temp already. It does have 2 holes cut out the walls with a heater filter taped on the outside. This blocks out dust but still allows an intake of fresh air.
The swamp cooler sits pretty much right against one of the intake filters and is dimensionally close to the same size, so that the intake draw of the cooler comes through the filter as much as possible without the cooler being outside.
I had originally planned to keep it outside, as hot, dry air into the cooler will work best, but then realized the blue material wouldn't block the dust as well as the heater filter when the cooler was not being used. So I figured it would still work if it was inside the yurt, as long as the intake air came through the filter from outside the yurt. Admittedly, it does pull some "inside" air, reducing efficiency, but it definitely reduced the temp in the yurt significantly; we were quite popular with our campmates. And, it was much cleaner as a result. The melted ice from the ice chests that fed the swamp cooler were right next to it, making refills easy.
If power is an issue (like it was for us) having a float switch and gravity fed system really helps. The 5 fans we used in the yurt (4 on the cooler, one exhaust on top) draw a total of 1.4 amps DC. I can't seem to find the water pump specs, but it also ran off DC. We have a 60w solar panel setup that charges a 12v marine cycle battery from Wallyworld. During the day the cooler would be on and we would still be able to charge the battery for the lights (I made some LED lights for the inside as well).
Again, not my design, but having a rough idea of what to do helped me alot. Big props to John Wells, the designer of the pepino.
Here's a link to the float switch design I used, I found it on an salt water aquarium site after a google search....
and for the fans
http://www.surpluscenter.com/item.asp?U ... e=electric
i think your design might use a bit more water & power than mine, but it looks like it puts out a lot more cold air.
I'm very jealous of your flip-top btw