The pipes run the length of the greenhouse about eye level and have nozzles about every 5 ft. My nozzles are large, rated at 8 gallons/hour. Most systems use smaller nozzles rated at 1-2 gph. The large nozzles cover a wide area but at the expense of higher water use. Municipal water pressure is typically 50 psi or higher and should work with most nozzles. Other systems use continuous fogging or evaporative coolers. All can be effective and the choice depends on your growing conditions and the types of plants you grow. We grow mostly rainforest plants that thrive in very high humidity. Most of these plants grow in fairly hot areas, but many are from higher altitudes where temperatures are moderate. Misting really helps control high temperatures and supply the moisture these plants need.
A good selection of misting systems is at http://www.charleysgreenhouse.com/index.cfm?page=_a1&cid1=203
Hopefully others will add posts on their experience with misting/fogging/evaporative cooling systems. Picture is a single nozzle firing.
Dave.
p,s. Sorry I didn't post Part 3 first!
