First off I am also a skeptic on this version of the cooling effect...though the conditions set in the video did not match the description of how the effect works. Anyway, I had an idea for a hexayurt passive cooling system that I designed, and started but did not get to try last year (and won't this year either).
Here's the idea: Put a black plastic PVC pipe in the center of the roof. The sun will heat the pipe causing the hot air inside the pipe to rise, consequently drafting cooler air in the bottom, through the spaces around the door flap. To further cool the air coming in, you could build the hexayurt directly next to an evap pond you are using to deal with your shower water. To further cool you could place a length of copper tubing into the evap pond, with one open end just pointing into the air and the other open end inside the hexayurt. The sun heats the black PVC which causes a strong updraft. The updraft pulls air in through the copper pipe. The air moving through the pipe cools down. The copper pipe is laying in the evap pond so the evap effect is further cooling the air. Does this system sound like it would work? On Fri, Aug 26, 2011 at 12:15 PM, The Distinguished ... <[email protected]> wrote: > Greetings, > > Sorry I'm behind again, catching up from being at Pennsic (and living in > a collection of connected traditional ger (yurt)) cooled in the > traditional style (open roof vent hole, raise the sides a little, and > get a pleasant breeze) quite pleasantly. > > A few questions, if I may, > > On Tue, 2011-08-09 at 19:04 -0700, KK wrote: >> Ok...part 2 of the video test is up. >> >> http://youtu.be/bJXd71ZaWls >> >> Foam board covering. Model on ground. >> >> Outside Temp - 100 deg. F > > What was the inside temp? > >> Windspeed - 7mph >> Sun Intensity - Off the chart! >> >> Same result. No difference. No reverse air flow downwards. >> So, if you are one of the "wee people" living in a tiny hexayurt, >> Bucky Fuller is not your friend. >> Prepare to sweat. > > What is the temperature of the smoke? That might effect things, if we > are expecting it to rise or fall. > > What was the expected difference in the vent-size for the roof-vent and > the side vents? > > From my read of the quote, the top vent should be much smaller than the > side vents, not that I think it would make much difference, unless the > air in the structure started cooler, or the whole system started cooler, > and the outside heated up quite a bit faster than the inside, which > might (might, mind you, not would) bring the inside air out, but you > would be "cooling" with moving warmer air, pulled in from the top, > because the coolest air would be being pulled out of the bottom vents. > > So, even if the reverse flow worked, you would be moving warmer air, and > perceiving the moving warmer air as cooler than the static cooler air, > simply because of evaporation, and "any breeze is better than none." > > I'm still much more enamored at the vacuum pull of heated air up a black > pipe, you are still moving warmer air than cooler air, but it is > probably much easier to arrange for, and still used the Joule-Thompson > effect to "cool" or at least speed the air up in its movement similar to > the Venturi effect. The Coanda effect could be used for the redirection > of the flow, due to the shape of the pipe, causing more suction up > through the pipe. > > Of course, as a side note, the Bernoulli Principal applies to a liquid > or a gas, for it's a fluid, and both follow the rules, see also: > http://mitchellscience.com/bernoulli_principle_animation > > Percy > > > > -- > You received this message because you are subscribed to the Google Groups > "hexayurt" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/hexayurt?hl=en. > > -- William Ozier, Director of the Camassia Institute at Lost Valley www.lostvalley.org (541) 937-3351 -- You received this message because you are subscribed to the Google Groups "hexayurt" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/hexayurt?hl=en.
