David is right. You definitely need to have an exhaust vent. Swamp cooling cools by moisture evaporating in dry air -- not by creating increasingly swampy air. You must draw fresh dry air in, and let the moist air out.
Since the moist, cooler air falls to the floor, it is best not to depend upon a roof exhaust vent. A mid-height window, or open door will do the trick. RE: your test. You didn't tell us WHERE, what region, you were conducting the test in. Were you in a region with 30% or less relative humidity? If so, your test would be a good indicator of the effectiveness of the evaporative cooling, once you have the intake and exhaust set up correctly. If you were in a higher humidity zone, there is no point in running the test. It simply won't give you any indication of how the evaporative cooling will work in low-humidity, desert conditions. Hope that helps. ken winston caine On Tue, Sep 3, 2013 at 11:41 PM, David Kelso <[email protected]>wrote: > A swamp cooler needs to be constantly moving fresh air in, humid air > out in order to keep cool. So you should aim to have a directional > airflow path. It can go up to the roof, or out to the door. You need > to make sure the outlets are big enough that the fan isn't fighting > any extra pressure inside the yurt. An outlet fan would help with that > but isn't strictly necessary > > The major factor in swamp cooler effectiveness is fan speed. Which fan > were you using? > > For anecdotal evidence, last year I was in a 6ft stretch and was > getting at least 30 degree F cooling throughout the whole yurt. > > On Tue, Sep 3, 2013 at 10:19 PM, Jason Adams > <[email protected]> wrote: > > So I setup an H12, with two swamp coolers, with insulated ducts into > > opposite ends of my Yurt. Just cut a hole for the ducts. > > > > Its going to be hard to describe, but I still felt like the swamp > coolers or > > the yurt wasn't really cooling much. I felt like being out in the sun, > but > > in the breeze was way more cooling that in a h12 with two swamp coolers > > running. The airflow really close to the duct holes was nice, but once > you > > got more than a foot away from duct, you didn't really feel it. > > > > It also felt hot inside, maybe thats just the moisture or sticky icky > > feeling you get from releasing that much moisture in the air. > > > > It's definitely nice not having the intense light on you, the yurt > certainly > > kept alot of that sun off the ground , probably getting a cooling ground > > effect, but I feel like I was missing some comfort. > > > > I feel like my options are to basically vent the yurt, or do a fan > exiting > > air at the top of the yurt. Which would ideally get more airflow in the > yurt > > -- however I feel like that would lose some of the effect of the swamp > > cooling (after all I'm sealing the bottom to keep the cool air in > right?). > > > > Maybe what I really needed was some type of airflow in the yurt, either > up > > the power of the swamp cooling fans -- or hang a big fan from the top of > the > > yurt. > > > > Just trying to figure out how to make this thing more comfortable, > because I > > honestly felt cooler under a shade structure, with some pillows and the > > breeze coming through. > > > > Thoughts? > > > > -- > > You received this message because you are subscribed to the Google Groups > > "hexayurt" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > To post to this group, send email to [email protected]. > > Visit this group at http://groups.google.com/group/hexayurt. > > For more options, visit https://groups.google.com/groups/opt_out. > > -- > You received this message because you are subscribed to the Google Groups > "hexayurt" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/hexayurt. > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "hexayurt" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/hexayurt. For more options, visit https://groups.google.com/groups/opt_out.
