Cooling the Earthship.
Yesterday I added a mister line to the greenhouse to cool it off now that it is getting in the 90s inside it. I installed the line above the stacks with a dozen fine spray misters and have them running 1-2 minutes every hour on the hour from 10 am to 4 pm. In testing this lowers the temp over 10 -15 degrees. I have removed the greenhouse ridge cap and will be installing an aluminet shade over the outside of the greenhouse in a few weeks. This will be suspended on a plastic pipe frame over the whole structure to keep it from having contact with the poly glazing. I keep all of the lower windows open. Since the roof is not finished it gets a lot of airflow. I will be making the roof cap, and most of the windows and lower vents operable with passive solar (temp) vent openers. I will probably have to add a swamp cooler or thermostatic fan to keep the temp down. I will wait until the fall to close in the rest of the roof. What I would really like is heat my pool and cool the greenhouse that way. Any suggestions.
Just purchased a home in Cape Town, South Africa and 48 hours ago discovered the incredible world of Aquaponics. I have a fairly large enclosed courtyard that i am thinking of building closed on the top with a wooden frame and glass and then put an aquaponics system inside. Had a brief read below and it looks like cooling such a permanent fixed structure like this impossible. Shall I rather just put shade cloth over the fixed walls as its summer here and temperature is between 90 - 110 each day. Looking forward to anyone's feedback before i purchase the timber and glass to build this thing.
Thanks, Confused Cape Townian (Bruce)
Well...shade cloth is a pretty inexpensive shade cloth material :) I've also sprayed on a solution of calcium hydroxide, salt and zinc sulfate on glass glazing panels, I've also tried a white latex paint (watered down about 1:15)...both seem to work real well and are pretty inexpensive, but don't use either of those on plastic GH liner (PE). Those are for glass only.
On some of my plastic (PE) hoop houses (when stuck in a crappy region of an even crappier country, where buying shade cloth isn't really an option) regular old mud (yup, dirt and water) worked just dandy as a shading material...and can be a blast to apply if you have the right kind of help :) It doesn't really hurt the PE, and comes off pretty much by itself during the rainy season right before winter. So that works out pretty nicely (if you live in such an area), and you can't beat the price...