71°C
NASA map shows temperatures up to 160 degrees on Phoenix streets
11–19 of 19 posts
Re: NASA map shows temperatures up to 160 degrees on Phoenix streets
#12Phoenix "city planners" (do any cities actually do any intelligent planning?) must be the most pointless job in the world. "How can we design something so awful that it is nearly uninhabitable?" must be their design philosophy. Or perhaps I should give them more credit; it may be a high quality experiment in Martian landscaping and terraforming.
Re: NASA map shows temperatures up to 160 degrees on Phoenix streets
#13We have got to come up with an inexpensive and non-slippery solution for painting streets white in these cities. I know it’s possible, but all of the existing solutions seem to be really expensive or change the grip of the pavement, or else just don’t last very long.
Would it be so bad to use concrete instead? Sure the up front cost is higher, but it has a higher albedo and lasts longer, especially since Phoenix doesn't have snowplows tearing up the streets.
The total cost of ownership differences between asphalt and concrete roads is astronomical.
A single pothole in concrete is a very invasive fix with significant amount of debris, but asphalt can be almost infinitely recycled.
Replacing asphalt means eating up the debris and putting it right back in the ground. Replacing concrete means toting truck loads of the stuff _somewhere else_ to sit
Re: NASA map shows temperatures up to 160 degrees on Phoenix streets
#14...due to asphalt absorbing heat from unobstructed sun. 160'F is hot enough to boil an egg in under a couple of minutes. My reaction: https://upload.wikimedia.org/wikipedia/commons/c/c5/Edvard_M...
Yes, it could cook an egg. But to boil an egg at 160ºf you'd have to be at the top of Everest.
Re: NASA map shows temperatures up to 160 degrees on Phoenix streets
#15We have got to come up with an inexpensive and non-slippery solution for painting streets white in these cities. I know it’s possible, but all of the existing solutions seem to be really expensive or change the grip of the pavement, or else just don’t last very long.
https://www.cbsnews.com/news/los-angeles-is-painting-some-of... It's being tested but is very expensive.
Phoenix does this:
https://www.scientificamerican.com/article/to-beat-the-heat-...
> Experts say road temperatures in the Phoenix area can rise to 180 degrees on a hot day
I guess being only 160°F means the gray is working. I wonder how well it would do if it were painted white.
Re: NASA map shows temperatures up to 160 degrees on Phoenix streets
#16...due to asphalt absorbing heat from unobstructed sun. 160'F is hot enough to boil an egg in under a couple of minutes. My reaction: https://upload.wikimedia.org/wikipedia/commons/c/c5/Edvard_M...
Yes, it could cook an egg. But to boil an egg at 160ºf you'd have to be at the top of Everest.
Hahaha, indeed! :-)
Re: NASA map shows temperatures up to 160 degrees on Phoenix streets
#17In hundreds of years some future religions will believe in the myth of Phoenix rising from its ashes.
Re: NASA map shows temperatures up to 160 degrees on Phoenix streets
#18You only need 120 degrees and 45 mins to cook an egg on the pavement
Re: NASA map shows temperatures up to 160 degrees on Phoenix streets
#19Earlier quoted context omitted.
Would it be so bad to use concrete instead? Sure the up front cost is higher, but it has a higher albedo and lasts longer, especially since Phoenix doesn't have snowplows tearing up the streets.
The total cost of ownership differences between asphalt and concrete roads is astronomical. A single pothole in concrete is a very invasive fix with significant amount of debris, but asphalt can be almost infinitely recycled. Replacing asphalt means eating up the debris and putting it right back in the ground. Replacing concrete means toting truck loads of the stuff _somewhere else_ to sit
Road concrete gets crushed and used as road base.
Not the exact, perfect reuse of Asphalt but it does end up used as fill.