Rethink Your Life!
Finance, health, lifestyle, environment, philosophy
The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] Passive coolingLeslie Moyer Unschooler at atlasok.com
Sun Jun 10 11:19:06 PDT 2007
paul wrote: > Hi, here's an interesting article about passive air conditioning by use of a > "cooling tower" (a Persian design.) <<snip>> > > http://www.thefarm.org/charities/i4at/lib2/aircool.htm I don't understand what benefit is derived from having the cooling function up high in the tower. It seems to me that the same benefit could be derived from just doing the evaporative cooling at the bottom & exhausting heat out the top of the tower, since heat naturally rises. I can see that the tower would help to circulate the air, creating a downward fall, but, if designed right, this could be accomplished in other (maybe less expensive) ways. My understanding of "Persian design" is that a wind scoop catches air at the top of a tower, then pulls it down to ground level (or below), where it then meets the evaporative chamber. The house we're designing now has passive cooling built into the design....here's what we're doing: House is bermed into a south-facing hillside. We have a tower that sits several feet above the highest point of the house with an exhaust fan and operable windows. (This will likely double as an outdoor sleeping porch and/or viewing tower.) Prevailing winds come from the south-southwest and building site is high enough to get a good breeze most of the time. Ground floor is all one level except for one slightly-elevated dining room (elevated about 2 or 3 feet). Elevated dining room has a north-facing patio, bermed deeply into the hillside. There is a water feature (waterfall and evaporative vegetative "green" wall) on the north outdoor patio (creating the "evaporative" function, as well as a beautiful patio). On a hot day, all windows can be closed except the north-facing patio doors and the cooling tower windows and/or exhaust fan (if a mechanical assist is needed). Prevailing winds will create negative pressure on the north side of the house, drawing cooled air down the patio walls and in through the patio doors, where it will sink to the ground floor, forcing heated air out the top of the cooling tower. We have a couple of benefits over the website design: We get to enjoy the evaporative cooling feature (patio & living wall to use as outdoor living space) AND we also get to use the tower as living space. Also, evaporative cooling works best in very dry climates....working less-well the more humid a climate is. Therefore, in our humid climate (Oklahoma), the earth-berming lends an additional cooling benefit. Below-grade cob doesn't work, however, so that's a glitch here on this cob list. An architect is working on plans, so some of this is unknown as-yet, but those are the plans and she's working them into our design. --Leslie
Solar powered hosting (from our cob office building) provided by: DeaTech Research Inc. using Debian Linux based servers. We highly recommend, use, and provide support services for Debian Linux.
If you should have any problems with this page or website, please send email describing the problem(s) to: email@example.com
Last Modified: Wednesday, 09-Dec-2009 17:36:41 PST
If you wish to be permanently blocked from ever being able to send email to this domain, send your SPAM messages to: firstname.lastname@example.org