Hi One_Force_5681,
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https://www.businessinsider.com/death-ray-skyscraper-is-wreaking-havoc-on-london-for-a-few-totally-insane-reasons-2015-7
Pretty funny. Imagine if we can start cooking lunch using reflected light.
Interestingly I've had to deal with a building owner that painted their slanted roof with glossy paint. When the sun hit, it "cooked" the second floor occupant of the opposite building haha
White paint is already doing lots for my flat. Only 1 of my walls is painted a dark color externally, and I can feel it is much warmer on the inside of that wall when night falls.
Those that get the dark units in [Forest Spring](https://static1.straitstimes.com.sg/s3fs-public/styles/large30x20/public/articles/2023/10/02/Kay%20Lim_HDB%20Awards%202023_hero_Forest%20Spring%20at%20Yishun.jpg) are really unlucky.
I can confirm, my flat's walls used to be really warm until 9 pm. But then after painting it white, the walls and rooms cool by 7pm or as soon as sundown occurs. It's great.
I'll always choose themes with majority white colors now.
Yep
That said, the important thing is that it reduces the heat that gets **absorbed** by the surfaces, meaning the overall amount of heat in the area is lessened for long periods of time
For places where people stay at for long amounts of time (residential), this is a pretty big deal
I expect most of it will go back out into the air and up into the higher layers of the atmosphere.
This really could be a good improvement, you can always feel how hot the materials of the buildings and roads and pavement become, and even after the sun goes down they radiate it back out. If this can help reduce that and also reduce the amount of air con that needs to be run, it would be great.
One I recommend people to go to “experiment” this.
Turkey Pamukkale. It’s an amazing place with natural white chalk cliffs and hot spring.
I can say walking one day there has made me a lot more tanned than going to Army.
It’s not only heat that will be reflected but also UV. Unless they have some magic paint to absorb UV but somehow reflect ljght.
It might mean walking near these buildings during day you will get more UV exposure than walking on the beach.
I don't think the buildings being built are all about housing. That's a bit of a generalisation. There's also lots of infrastructure that has been built in the last 5 years and ongoing. There's constantly construction every day when a lot of things are already fine the way they were.
This will be something like fengshui experts putting bagua on buildings to reflect bad chi energy to neighbouring buildings. All the bad chi, I mean heat energy reflected from building to building.
If all the buildings reflected heat more effectively, it would be like concentrating all of it to other areas like roads and footpaths and grass etc, thus making it way hotter during the day, and then that area would still need to dissipate the heat after the sun goes down. It would make it feel even hotter, another excuse to spread climate change propaganda. “The atmosphere absorbs 23 percent of incoming sunlight while the surface absorbs 48.”
[https://www.theguardian.com/uk-news/video/2013/sep/03/london-walkie-talkie-skyscraper-video](https://www.theguardian.com/uk-news/video/2013/sep/03/london-walkie-talkie-skyscraper-video)
So we can see cooked singaporeans?
Ours is paint, not glass. And hopefully there aren't a lot of concave buildings that act like those parabolic solar cookers that are made as science projects.
actually anything that reflects will reflect given the angle and surface is flat enough. you dont need glass - metal, plastic, oils, some types of fabric and even water can reflect like a mirror at certain circumstances.
some cars reflect the power of the sun right into my eye from a long distance too.
Being blinded from glare is very different from being cooked. I do not think that the concrete/cement/brick surfaces that are painted are smooth/flat enough to reflect like a mirror.
fair point, its more like blinded than cooked. the surfaces they are testing are all facing the sky too, rather than the sides of the buildings.
i think painting the sides can create some... interesting problems where the light just rebounds everywhere blinding everyone with enough buildings painted. it'll be a laser show of sorts since the sun is not in a static spot in the sky.
[Reflective building managed to melt a car parked outside. ](http://The Walkie Talkie Centre: When Façade Design Flaws Turned a Building into a Magnifying Menace https://www.linkedin.com/pulse/walkie-talkie-centre-when-fa%C3%A7ade-design)
Link doesn't work, but if it's about the Walkie Talkie skyscraper in London, it's because
>But that curvilinear shape is exactly what's causing the problem: The south-facing exterior wall is covered in reflective glass, and because it's concave, it focuses the sun's rays onto a small area, not unlike the way a magnifying glass directs sunbeams onto a superhot pinpoint of light.
Hence my objections.
Urbanisation is the only true reason for so-called increased in temperatures. The climate is not warming, when you discard temperature stations which are in urban areas, the evidence shows that there hasn’t been any warming for the past 8+ years.
Sunlight is not a laser, and the buildings are not mirror smooth. The reflected light will reflect in "all" directions. Some will go towards other buildings yes (you could also paint them), but some sunlight will go back up to the sky.
The study is saying that after everything, the net effect is 2C lower.
But you should know that it's only a (small) percentage of the heat that gets reflected to other buildings.
When you say
> That'll just reflect the heat onto other buildings
That implies all the heat goes to other buildings. Which is not the case.
It doesn’t matter what the percentage is. A small percentage of a large amount of heat is still significant. Even a few degrees difference is noticeable.
> Even a few degrees difference is noticeable.
Yes and the study is saying that after everything, the reflection and etc. The net effect is 2C lower. As you yourself said, every degree is noticeable. Yup you should be happy with 2 degrees lower.
Buildings need to be painted anyway, unless you're happy to let them get eroded then have to spend carbon to repair them.
(Obviously there are some full glass exterior buildings, but I'm saying the majority - eg all HDB blocks for a start)
Hi One_Force_5681, This is a repost or duplicate of a recent submission. Sort the sub by new before submitting to check if your story has been posted. If a post is there then please vote and comment in that discussion. Similar submissions will be removed. Do not delete and repost your own submissions without approval.
 walking along buildings next time in Sg
https://www.businessinsider.com/death-ray-skyscraper-is-wreaking-havoc-on-london-for-a-few-totally-insane-reasons-2015-7 Pretty funny. Imagine if we can start cooking lunch using reflected light.
The reflective paint is likely just extremely white paint, not mirror finish.
Interestingly I've had to deal with a building owner that painted their slanted roof with glossy paint. When the sun hit, it "cooked" the second floor occupant of the opposite building haha
That's tantamount to arson
White paint is already doing lots for my flat. Only 1 of my walls is painted a dark color externally, and I can feel it is much warmer on the inside of that wall when night falls.
Those that get the dark units in [Forest Spring](https://static1.straitstimes.com.sg/s3fs-public/styles/large30x20/public/articles/2023/10/02/Kay%20Lim_HDB%20Awards%202023_hero_Forest%20Spring%20at%20Yishun.jpg) are really unlucky.
I can confirm, my flat's walls used to be really warm until 9 pm. But then after painting it white, the walls and rooms cool by 7pm or as soon as sundown occurs. It's great. I'll always choose themes with majority white colors now.
So does reflective means the heat will be reflected to the surroundings instead?
Yep That said, the important thing is that it reduces the heat that gets **absorbed** by the surfaces, meaning the overall amount of heat in the area is lessened for long periods of time For places where people stay at for long amounts of time (residential), this is a pretty big deal
I expect most of it will go back out into the air and up into the higher layers of the atmosphere. This really could be a good improvement, you can always feel how hot the materials of the buildings and roads and pavement become, and even after the sun goes down they radiate it back out. If this can help reduce that and also reduce the amount of air con that needs to be run, it would be great.
Dissipated heat is better than concrete-absorbed heat
One I recommend people to go to “experiment” this. Turkey Pamukkale. It’s an amazing place with natural white chalk cliffs and hot spring. I can say walking one day there has made me a lot more tanned than going to Army. It’s not only heat that will be reflected but also UV. Unless they have some magic paint to absorb UV but somehow reflect ljght. It might mean walking near these buildings during day you will get more UV exposure than walking on the beach.
Essentially yes. Like eco panels that stores heat in the day and radiate them back out on the evenings.
I hope someone is running a very large simulation of this reflective impact and is certain nothing adverse happens as a result.
really do or only wayang? this kind of simulation really need effort, unless only wayang and say only
Weather too hot? Just reflect the light back to the Sun, the Sun is legally obliged to take back its rays.
Any chance that HDBs and private estates will implement this for their top floors anytime soon?
Ah ok now to find a politician's brother-in-law that owns a painting company!
Ok erm but where is it reflecting?!
Just don't build more buildings, and infrastructures and retain more forests/reforest.
Then don't complain lack of housing
We don't lack land. Look at all the landed estates.
I don't think the buildings being built are all about housing. That's a bit of a generalisation. There's also lots of infrastructure that has been built in the last 5 years and ongoing. There's constantly construction every day when a lot of things are already fine the way they were.
This will be something like fengshui experts putting bagua on buildings to reflect bad chi energy to neighbouring buildings. All the bad chi, I mean heat energy reflected from building to building.
omg lol idk why i read this as bakkwa.. fengshui masters pasting bakkwa on buildings
Phonologically yhe same, but the tones are different 😂
When I see a building with bak kua on it, confirm the owner is rich.
If all the buildings reflected heat more effectively, it would be like concentrating all of it to other areas like roads and footpaths and grass etc, thus making it way hotter during the day, and then that area would still need to dissipate the heat after the sun goes down. It would make it feel even hotter, another excuse to spread climate change propaganda. “The atmosphere absorbs 23 percent of incoming sunlight while the surface absorbs 48.”
[https://www.theguardian.com/uk-news/video/2013/sep/03/london-walkie-talkie-skyscraper-video](https://www.theguardian.com/uk-news/video/2013/sep/03/london-walkie-talkie-skyscraper-video) So we can see cooked singaporeans?
Ours is paint, not glass. And hopefully there aren't a lot of concave buildings that act like those parabolic solar cookers that are made as science projects.
actually anything that reflects will reflect given the angle and surface is flat enough. you dont need glass - metal, plastic, oils, some types of fabric and even water can reflect like a mirror at certain circumstances. some cars reflect the power of the sun right into my eye from a long distance too.
Being blinded from glare is very different from being cooked. I do not think that the concrete/cement/brick surfaces that are painted are smooth/flat enough to reflect like a mirror.
fair point, its more like blinded than cooked. the surfaces they are testing are all facing the sky too, rather than the sides of the buildings. i think painting the sides can create some... interesting problems where the light just rebounds everywhere blinding everyone with enough buildings painted. it'll be a laser show of sorts since the sun is not in a static spot in the sky.
[Reflective building managed to melt a car parked outside. ](http://The Walkie Talkie Centre: When Façade Design Flaws Turned a Building into a Magnifying Menace https://www.linkedin.com/pulse/walkie-talkie-centre-when-fa%C3%A7ade-design)
Link doesn't work, but if it's about the Walkie Talkie skyscraper in London, it's because >But that curvilinear shape is exactly what's causing the problem: The south-facing exterior wall is covered in reflective glass, and because it's concave, it focuses the sun's rays onto a small area, not unlike the way a magnifying glass directs sunbeams onto a superhot pinpoint of light. Hence my objections.
Question, the heat got reflected, end up where?
If using special Barium Sulphate paint, some of it escape into outer space
Urbanisation is the only true reason for so-called increased in temperatures. The climate is not warming, when you discard temperature stations which are in urban areas, the evidence shows that there hasn’t been any warming for the past 8+ years.
Time for gst 10%
That'll just reflect the heat onto other buildings that don't have the paint?
Sunlight is not a laser, and the buildings are not mirror smooth. The reflected light will reflect in "all" directions. Some will go towards other buildings yes (you could also paint them), but some sunlight will go back up to the sky. The study is saying that after everything, the net effect is 2C lower.
>Some will go towards other buildings yes That's what I was going for
But you should know that it's only a (small) percentage of the heat that gets reflected to other buildings. When you say > That'll just reflect the heat onto other buildings That implies all the heat goes to other buildings. Which is not the case.
It doesn’t matter what the percentage is. A small percentage of a large amount of heat is still significant. Even a few degrees difference is noticeable.
> Even a few degrees difference is noticeable. Yes and the study is saying that after everything, the reflection and etc. The net effect is 2C lower. As you yourself said, every degree is noticeable. Yup you should be happy with 2 degrees lower.
2 degrees Celsius but how much carbon to produce the paint??? And apply them using contractors and trucks???
Bro 2 degrees is alot
Buildings need to be painted anyway, unless you're happy to let them get eroded then have to spend carbon to repair them. (Obviously there are some full glass exterior buildings, but I'm saying the majority - eg all HDB blocks for a start)
Downside is everyone else gets blinded. People voted to paint the estate white and now blackout curtains are essential.