No.2. Selection of nozzles

Let me explain about nozzles to generate fog and mist. As I described in the previous section, I have tried to use several kinds of shower head that were usually available to purchase at a do-it-yourself store. I also found a problem that flowing water quantity was too much, though the fog was generated.
Then the heads were modified to decrease water quantity without lowering hydraulic pressure. I tried several ways, and found that was the best to close all the discharge holes with glue except only one. And the remaining hole was narrowed to minimize spraying area by inserting a piece of metal wire.

I felt that it still wasted water though I modified nozzles because puddle was created on ground by operating for half hour. Therefore, I looked for other nozzle with smaller water consumption, and I found G530 of Takagi Ltd.. Water consumption was decreased to 0.4 liters/a minute without any modification of the nozzle. I also felt the size of the mist became smaller than the previous nozzles. The actual sales price of G530 is about 1300 yen in internet.

http://www.takagi.co.jp/en/

If mist size becomes smaller than 10 microns meter, it doesn't get wet nor adhere because it becomes so-called "dry mist". Since mist is able to invade into room and to make laundry wet in the vicinity according to wind, it is important how to avoid wetting.
This solution can be enough practical in case of right installation of the nozzles. Although the real dry mist cannot be created by using such a gardening nozzle. To cool down the air, it is effective to wet surrounding trees and wall to some degree when using it in garden at home.
Although a real dry mist generator was installed and replaced in 2008 July, I found it also actually made wet. This topic is to be explained later.

By the way, nozzles are soon damaged if left without covers between autumn and spring. At least, nozzles should be detached or be protected with a plastic bag apart from piping. In my case, all the nozzles were covered between 2004 autumn and 2005 spring, but one piece was broken. Durability might be this level.

I will report how effective it was next time.