Passive cooling

An amazingly extensive list of all you did or didn't want to know about passive air conditioning etc.

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secondary roof

I have been thinking about building a high canvas top at a different angle than my primary roof. for my place in Managua, basically it would just cast a nice shadow down on my primary tin roof.

Does anyone know of anyone that does Sailboat Canvas? I would need some heavy material and some heavy stitching.

Thank you

Thanks evets....I was looking at wet walls for cooling on the architectural standards book, but your link has much better ideas.

please remember,

if you build it, i will come! i'd like to see some of the ideas incorporated into your house before i build mine. (i am 15 - 20 years from building) thanks.

Jim Richard

This is right up Jim's alley!

if you build it....

i will come. glad to see someone else struggle with that idea.

i think this could work in the dry season in sjds

from the above mentioned site:

"We started construction on the cool tower in the spring of 1985 and used it that summer. The system has undergone several changes. The first upwind scoop was metal, and not a good choice unless you use aluminum. Our scoop now has a framework of steel covered with heavy canvas. The cool tower has been in operation nine years. On a hot dry day (100ºF with 10% humidity) the air coming from the tower is 65-70ºF. We are very pleased with the performance. I am saving the finishing touches for a 110ºF day — that's when working inside the cool tower is quite enjoyable!"

evets, "build it and i will come" (that is from that baseball movie)

Well it will

be a while! I'm trying to do the sums - we cool ourselves by evaporative cooling (or sweating as we in the trade call it). The higher the relative humidity (RH) the worse that works because, obviously, at 100% RH no sweat could evaporate. If you raise the RH of the incoming air by using an evaporative cooler than (assuming the RH of the incoming air is less than 100%) the air coming out of the chimney will be cooler but have a higher RH. Will this cancel out the effect of its being cooler?


having spent about 20 years in Aridzona, I can tell you that evap and humidity don't work. And there, at least, it's all based on the dew points -- once you hit about 50 degrees, off goes the evap and on goes the a/c. Evap is a great cheap method of cooling but I've never been sold on it working in these tropical (humid) climes.

you certainly have the experience.....

then from that rather exhausive page, what will work?