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re: Help find an old thread—Cooling the roof with sprinklers
Posted on 6/25/22 at 11:01 am to BoogaBear
Posted on 6/25/22 at 11:01 am to BoogaBear
quote:
it does not work in a cost effective manner
If the supply water was air temperature I'd agree.
But it comes to your house already significantly cooled. So I'm betting it's more efficient than you think.
0
Posted on 6/25/22 at 11:10 am to junior
Why not just have radiant barrier installed?
Posted on 6/25/22 at 12:12 pm to Obtuse1
quote:
Do you have data or just your gut? If it is just gut then I would point out it is a damn complex system with many variables that would directly impact the economics of the endeavor.
I have data of a sort. Virtually no one does it, and the idea is a simple one. That means it never flourished in the market place. That’s enough data for me to not waste time thinking about it. If this was a clever new invention I would consider it.
Posted on 6/25/22 at 12:16 pm to Pepperoni
There is a fundamental mistake in that analysis. He calculates how much cooling would take place, but that cooling would take place outside. Big deal! The only cooling that would save the homeowner any money would be from the lower heat transfer through the shingles, felt, plywood and insulation due to the cooling of the exterior surface of the shingles. And that is a far lower number.
Posted on 6/25/22 at 12:31 pm to jscrims
They have some very good long term roofs, but the prices are high as giraffe nuts! My parents have had the same roof on their house for over 40’ish years, it’s some sort of synthetic slate type deal, super expensive to replace, but I think you can patch certain areas if you can match them up. But you didn’t mention “more affordable options” and that is correct
Posted on 6/25/22 at 12:41 pm to Penrod
quote:
There is a fundamental mistake in that analysis
Agreed. Such an obvious mistake. 8000 btu of cooling above your roof is not like adding an 8000 btu air conditioner!
Posted on 6/25/22 at 12:42 pm to CaptainsWafer
quote:
For it to work I would think you’d need water running on your roof all day. If you started in the afternoon your attic would already be too hot for the watering of the roof to make a noticeable difference.
Running water all day on the roof would be easy and affordable with a self-contained system powered by a small pump. This needs to be a thing.
Posted on 6/25/22 at 12:42 pm to junior
I need to adjust my thermostat, I'm freezing in here.
Posted on 6/25/22 at 1:05 pm to junior
Reflection works. Rent a strong sprayer and coat roof with white acrylic coating. Might look like shite on a house, but it works, lol
Now, whatever you do will reverse in the winter.
Easy cure is to have attic(underside roof areas) sprayed with a foam increasing the r factor.
Cooler in summer, warmer in winter
Now, whatever you do will reverse in the winter.
Easy cure is to have attic(underside roof areas) sprayed with a foam increasing the r factor.
Cooler in summer, warmer in winter
Posted on 6/25/22 at 2:31 pm to junior
Evaporative cooling. As water evaporates, it required energy (heat) to go from liquid to vapor.
Put running alcohol on your wrist and blow. Wrist is colder
Less humid areas have better evaporative cooling effects. Screwed here in Louisiana.
Put running alcohol on your wrist and blow. Wrist is colder
Less humid areas have better evaporative cooling effects. Screwed here in Louisiana.
Posted on 6/25/22 at 3:03 pm to junior
T=m*c*DeltaT
This post was edited on 6/25/22 at 3:06 pm
Posted on 6/25/22 at 3:06 pm to Westbank111
I just need a giant fricking umbrella to come out of the roof of my house and shade it whenever I feel like it
Posted on 6/25/22 at 3:24 pm to junior
Somebody needs to try it out on their car by spritzing the top periodically and taking temperature readings. I’m not gonna do it, of course, because it’s too hot outside.
Posted on 6/25/22 at 3:35 pm to Penrod
quote:
There is a fundamental mistake in that analysis.
Yeah, most of the cooling goes to cool the air around the water. And that is blows away.
quote:
The only cooling that would save the homeowner any money would be from the lower heat transfer through the shingles, felt, plywood and insulation due to the cooling of the exterior surface of the shingles.
Exactly. And the water will fall short of reaching the dew point, which is around 75 degrees in south Louisiana in the summer. Let's be generous and say that the water reaches 80 degrees. That's still going to be warmer than the inside of the house. What you HAVE done is reduce the heat loss through the roof when compared to having a really hot roof. Running cooling calculations based on the latent heat of evaporation and amount of water evaporated is absurd. You'd be a lot better off just buying more insulation for the attic. It will have the same effect, and pay off in the winter too.
In a chemical plant the cooling towers can do more than 100 million btu/hr of cooling. And yet somehow nothing is frozen at the base of the tower.
On the other hand, in the desert, they do use evaporative coolers to cool the air that goes into the house, and don't bother with air conditioners. But you need a very low dew point in the summer to pull this off.
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