hey everyone. I have a wooden (Cedar) shed with a corrugated iron room.
for dimensions see this pic:
dimensions.jpg

What i was thinking for a cooling system is have a hose run on the apex of the room with sprayers aiming on each side of the roof. These would come intermittently and would mist the entire roof for a minute or less. As the sun evaporates the water, the roof and grow room are cooled.

what i want to know is.
How well would this actually work?
if it could work well.. how often would i need to spray?
.. that's pretty much all there is to it

I'd just add a air cond to the shed and cool tubes for the lights.Vent her well and ya should be ok

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KRUZTY
http://www.michiganmedicalmarijuana.org/
http://www.rollitup.org/grow-journal...ical-grow.html

i don't really want alternative ideas.. i do vent her well and i am trying to figure out how to get a cool tube for my light/hood (circular shape with the bulb in the middle hanging vertically). i know i can do it other ways. I would like to know the vailidity of this option none the less.

Have you tried painting the shed roof white on the outside?

This should reduce the amount of heat built up by the metal roof.

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Thats really not going to help you out. But way to think outside the box! Like what Arrid said, paint the roof white. That will help reflect the heat alittle. And your best bet is to get an AC unit in there. Good luck!

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http://www.rollitup.org/grow-room-de...struction.html

the method you suggest would add humidity to the room. If water droplets got on the plants it could burn them when the lights hit them. I'd listen to the suggestions provided so far. Good luck!

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--spar--

how would it increase humidity? the water is outside.. none gets inside. and yeah painting it white is an idea.. but atm its a nice stealthy dull green/gray. thanks for the help guys.. i was talking to some other people and it seems like it could help but i'd need to basically mist every 5-10 minutes so that its like constantly evaporating, so thats a huge waste of water and i can't think of any way to recycle it so i wont be doing it... interesting to know though

It would depend on a few things.
outside temps. The sun/clouds and the temp of the water. by running water on the roof you would never get cooler then ambiant temps. the heat in side from your light rises and that would defeat any cooling you might get. just my thoughts.

the water isn't cooling the roof per sae.. it's the evaporation of the water which requires the energy (Heat) of the room to occur (an endothermic reaction). So i think technically this would allow cooler than ambient temps if enough evaporation takes place... but yeah it's not likely/easily applicable

How about building a ceiling in the shed then you can stick an exhaust fan in that which would help in two ways, first, it would reduce the amount of heat radiated into the shed from the tin roof and if you insulate it keep the shed warmer in the Chilly months!
if the ceiling can't be flat run it with the pitch of the roof, just leave an air gap between the ceiling and the roof so that you can vent your exhaust into that space as to create a air cushion (insulator) between the room and the roof!
Simple Yeah?