dmccarty, What I know about misters is limited... the key points seem to be the following:
You can get kits at box stores such as Home Depot where I got mine.
They come in various lengths and huge price variation.
For a starter situation, seems that maybe $30 is lowest for a low pressure system.. about 5 nozzles, plus filter for hard water plus drip on the end to drain line when it is turned off.
Attached to a regular pressure water hose, this mist system placed 15 ft or so in the air produces a fine mist but a few of the droplets are still of sufficient size to not evaporate before they reach the ground. Thus when used in a tool shed some equipment gets damp.
My system does not involve a fan. Perhaps if the misters were placed in a stream of air they would evaporate more effectively... I haven't tried this as yet.
The evaporative effectiveness is highest at very low humidity, say below 30%. Rather ineffective at higher humidity, say above 65%.
It is likely, but untried by me, that a high pressure system... produces finer droplets and more complete evaporation... 1000psi systems exist and their components, pumps, hose, etc. are really pricy, my opinion.... but I think this is what lots of restaurants etc. use very successfully. These can also be obtained at Home Depot, for a price.
As for temperature drop, the literature says that up to 20 degrees is possible. In my situation, I got a barely perceptible drop in temperature for several reasons, including: 16 ft and 16 ft roll up doors both open at each end of building, breeze blowing misted air, only 5 nozzles.
At this point, I must keep the nozzles above an area free of tools to keep them dry. I'm looking for a squirrel cage fan from an old A/C unit that I can rig up, place the misters around and try that to see how it works.
So, my search for a cheapo work building solution to cooling continues... not surprisingly since if it were easy everybody would already be doing it
