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#41
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Painting roofs white can actually help lower the temperature of a city
On Mar 30, 5:36 am, "
wrote: On Mar 28, 9:40 am, George wrote: On 3/27/2013 9:42 AM, wrote: On Mar 27, 8:03 am, George wrote: On 3/26/2013 4:13 PM, wrote: On Mar 26, 4:03 pm, Metspitzer wrote: The idea of painting roads and rooftops white in order to combat carbon emissions has been around for years. It is surprisingly simple and effective and yet has not been implemented much. A study at the Lawrence Berkeley National Laboratory found that cooler pavement and roofs leads to cooler cities and an overall cooler world. Since buildings with white roofs reflect far more sun than those with black roofs, these buildings stay cooler. Less air conditioning has to be used, lowering the overall energy required to run the building. Also buildings with black roofs heat the space below them and this heat is carried spread by the wind. This raises the ambient air temperature in what is known as the urban heat island effect. Black roofs also radiate energy back into the atmosphere to be absorbed by clouds. This heat is then trapped by the greenhouse effect. As such, white roofs is one of the quickest and most cost-effective ways to reduce our carbon emissions. In an initiative launched by the Energy Department, the federal government hopes to exemplify the benefits by using these light roofs on their buildings. http://newscenter.lbl.gov/news-relea...-roofs-offset-... I say it's total BS. The best study I saw on roof color was done in FL. They took a bunch of identical houses, put varying types and color of roofs on them, fully instrumented the houses, and measured during AC season. The conclusion was that if you had a shingle roof, it made about a 10% difference in energy usage if you had a black rood or a white roof. And that was the energy usage with the houses unoccupied. They did another test when they were occupied and the energy usage difference dropped to just a few percent. Which makes sense, because when occupied the energy usage is going to be higher, because people are opening door, turning on TVs, cooking, etc. It would also seem to me that it's junk science to suggest that lighter roofs lead to a cooler world. X amount of solar radiation is hitting the earth. Almost all of it is going to go into heating it. So, it's hard to believe that because something is white that radiation is going back from earth to outer space. Maybe thats what Limbagh told you but reradiation into space is an actual physical phenomena. http://earthobservatory.nasa.gov/Fea...php-Hidequoted text - - Show quoted text - Figures someone would drag Limbaugh into the mix. Does Rush write and publish Discover Magazine and/or the cited studies? Don't know but your ranting sure sounds like the usual stuff from his groupies who just run with whatever "Rush said". https://blogs.discovermagazine.com/8...ofs-may...Hide quoted text - - Show quoted text -- Hide quoted text - - Show quoted text - And you sound like the typical lib elitist that drags Rush into anything and everything, claims he's said all kinds of things, but actually never listens to him. Oh, and BTW, a better source for energy that reaches the earth not making it back into space would be Al Gore. He's the one telling us green house gases, caused by man, are trapping all the heat. So, which is it? It's being trapped or you can just reflect it all back into space from the ground? We should develop a car engine that burns greenhouse gas. That would be a very useful thing. Or, we could develop a car that runs on hot air. Al Gore would make a fortune.. |
#42
Posted to alt.home.repair
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Get High Quality Roof Painting Service At Cheap Price
A part of roof restoration or replacement is painting, which instantly adds value to your house and give it character and appeal.The professionals of one the best roof painting Adelaide, Roof Doctors use the latest equipment to perform the services. Painting on the roof will prevent too much water penetrating your tiles and causing too much moisture build up in your roof.
For more details contact at : https://goo.gl/MYbTpt |
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