A study of houses, schools, offices and retail spaces in Brisbane and Townsville has found that roofs painted in a special reflective paint resulted in a 2°C reduction in the internal temperature of non-air conditioned rooms.
http://www.australasianscience.com.au/article/issue-september-2015/cool-paint-blows-air-con-costs-away.html
when did all building here looked up reflectivity ratings for CB colours, did everything in classic cream, rooves and outside walls, came near the best (on the eyes too) without going white as recall.
wookiemeister said:
A study of houses, schools, offices and retail spaces in Brisbane and Townsville has found that roofs painted in a special reflective paint resulted in a 2°C reduction in the internal temperature of non-air conditioned rooms.http://www.australasianscience.com.au/article/issue-september-2015/cool-paint-blows-air-con-costs-away.html
I find this non-amazing
I too find this non-amazing. Similar studies performed in all manner of other places around the world over the last umpteen years have yielded the same results.
Moreover, it accords with what you’d expect even if you did not do the experiment.
I suppose it provides an estimate of the benefit, 2 K.
dv said:
wookiemeister said:
A study of houses, schools, offices and retail spaces in Brisbane and Townsville has found that roofs painted in a special reflective paint resulted in a 2°C reduction in the internal temperature of non-air conditioned rooms.http://www.australasianscience.com.au/article/issue-september-2015/cool-paint-blows-air-con-costs-away.html
I find this non-amazing
It’s still an unknown. According to calculations, and observations, the colour chosen for a surface makes very little difference to the temperature inside. For example, you’ll see Bedouin in the desert who are happy to wear white, black or purple robes. The reason it makes very little difference is that the resulting temperature depends just as crucially on the emissivity coefficient at thermal wavelengths. If a body with white paint (low thermal absorption coefficient) also has matching low emissivity coefficient then the net effect on internal temperature is nil.
mollwollfumble said:
dv said:
wookiemeister said:
A study of houses, schools, offices and retail spaces in Brisbane and Townsville has found that roofs painted in a special reflective paint resulted in a 2°C reduction in the internal temperature of non-air conditioned rooms.http://www.australasianscience.com.au/article/issue-september-2015/cool-paint-blows-air-con-costs-away.html
I find this non-amazing
It’s still an unknown. According to calculations, and observations, the colour chosen for a surface makes very little difference to the temperature inside. For example, you’ll see Bedouin in the desert who are happy to wear white, black or purple robes. The reason it makes very little difference is that the resulting temperature depends just as crucially on the emissivity coefficient at thermal wavelengths. If a body with white paint (low thermal absorption coefficient) also has matching low emissivity coefficient then the net effect on internal temperature is nil.
Makes a difference inside black or white cars.
AwesomeO said:
mollwollfumble said:
dv said:I find this non-amazing
It’s still an unknown. According to calculations, and observations, the colour chosen for a surface makes very little difference to the temperature inside. For example, you’ll see Bedouin in the desert who are happy to wear white, black or purple robes. The reason it makes very little difference is that the resulting temperature depends just as crucially on the emissivity coefficient at thermal wavelengths. If a body with white paint (low thermal absorption coefficient) also has matching low emissivity coefficient then the net effect on internal temperature is nil.
Makes a difference inside black or white cars.
Interior color yes, very, but exterior colour not much at all. Or so I’ve heard, all the cars other than my most recent two have been white. The most recent two, silver and mid blue, haven’t had all that much internal temperature difference, but I haven’t had the mid blue one through mid-summer yet.
The importance of interior colour is that reflected/scattered light passes back out through the windows keeping the car cool whereas emitted IR is reflected back in by the windows. So interior white is a huge help for temperature, but a disaster for vision out through the windscreen. In exterior colour, both the reflected light and emitted IR cool the car, so it doesn’t make nearly as much difference.
It’d be interesting to test this out in a physical experiment, Mythbusters style. Measure the interior temperatures of 5 or more cars with different exterior colours in the same location after sitting in the Sun for the same length of time on a hot day.
mollwollfumble said:
It’d be interesting to test this out in a physical experiment, Mythbusters style. Measure the interior temperatures of 5 or more cars with different exterior colours in the same location after sitting in the Sun for the same length of time on a hot day.
Pretty sure they did this.
mollwollfumble said:
AwesomeO said:
mollwollfumble said:It’s still an unknown. According to calculations, and observations, the colour chosen for a surface makes very little difference to the temperature inside. For example, you’ll see Bedouin in the desert who are happy to wear white, black or purple robes. The reason it makes very little difference is that the resulting temperature depends just as crucially on the emissivity coefficient at thermal wavelengths. If a body with white paint (low thermal absorption coefficient) also has matching low emissivity coefficient then the net effect on internal temperature is nil.
Makes a difference inside black or white cars.
Interior color yes, very, but exterior colour not much at all. Or so I’ve heard, all the cars other than my most recent two have been white. The most recent two, silver and mid blue, haven’t had all that much internal temperature difference, but I haven’t had the mid blue one through mid-summer yet.
The importance of interior colour is that reflected/scattered light passes back out through the windows keeping the car cool whereas emitted IR is reflected back in by the windows. So interior white is a huge help for temperature, but a disaster for vision out through the windscreen. In exterior colour, both the reflected light and emitted IR cool the car, so it doesn’t make nearly as much difference.
It’d be interesting to test this out in a physical experiment, Mythbusters style. Measure the interior temperatures of 5 or more cars with different exterior colours in the same location after sitting in the Sun for the same length of time on a hot day.
Mythbusters did do it, the White car was cooler Inside.
mollwollfumble said:
AwesomeO said:
mollwollfumble said:It’s still an unknown. According to calculations, and observations, the colour chosen for a surface makes very little difference to the temperature inside. For example, you’ll see Bedouin in the desert who are happy to wear white, black or purple robes. The reason it makes very little difference is that the resulting temperature depends just as crucially on the emissivity coefficient at thermal wavelengths. If a body with white paint (low thermal absorption coefficient) also has matching low emissivity coefficient then the net effect on internal temperature is nil.
Makes a difference inside black or white cars.
Interior color yes, very, but exterior colour not much at all. Or so I’ve heard, all the cars other than my most recent two have been white. The most recent two, silver and mid blue, haven’t had all that much internal temperature difference, but I haven’t had the mid blue one through mid-summer yet.
The importance of interior colour is that reflected/scattered light passes back out through the windows keeping the car cool whereas emitted IR is reflected back in by the windows. So interior white is a huge help for temperature, but a disaster for vision out through the windscreen. In exterior colour, both the reflected light and emitted IR cool the car, so it doesn’t make nearly as much difference.
It’d be interesting to test this out in a physical experiment, Mythbusters style. Measure the interior temperatures of 5 or more cars with different exterior colours in the same location after sitting in the Sun for the same length of time on a hot day.
Generally, grey interior and silver outside, works well. Though it is a shit colour on certain days against road reflection for safe vision, the silver outer, I mean.
AwesomeO said:
mollwollfumble said:
AwesomeO said:Makes a difference inside black or white cars.
Interior color yes, very, but exterior colour not much at all. Or so I’ve heard, all the cars other than my most recent two have been white. The most recent two, silver and mid blue, haven’t had all that much internal temperature difference, but I haven’t had the mid blue one through mid-summer yet.
The importance of interior colour is that reflected/scattered light passes back out through the windows keeping the car cool whereas emitted IR is reflected back in by the windows. So interior white is a huge help for temperature, but a disaster for vision out through the windscreen. In exterior colour, both the reflected light and emitted IR cool the car, so it doesn’t make nearly as much difference.
It’d be interesting to test this out in a physical experiment, Mythbusters style. Measure the interior temperatures of 5 or more cars with different exterior colours in the same location after sitting in the Sun for the same length of time on a hot day.
Mythbusters did do it, the White car was cooler Inside.
They didn’t need to do it. The customers have religiously purchased more white cars than any other colour.
roughbarked said:
AwesomeO said:
mollwollfumble said:Interior color yes, very, but exterior colour not much at all. Or so I’ve heard, all the cars other than my most recent two have been white. The most recent two, silver and mid blue, haven’t had all that much internal temperature difference, but I haven’t had the mid blue one through mid-summer yet.
The importance of interior colour is that reflected/scattered light passes back out through the windows keeping the car cool whereas emitted IR is reflected back in by the windows. So interior white is a huge help for temperature, but a disaster for vision out through the windscreen. In exterior colour, both the reflected light and emitted IR cool the car, so it doesn’t make nearly as much difference.
It’d be interesting to test this out in a physical experiment, Mythbusters style. Measure the interior temperatures of 5 or more cars with different exterior colours in the same location after sitting in the Sun for the same length of time on a hot day.
Mythbusters did do it, the White car was cooler Inside.
They didn’t need to do it. The customers have religiously purchased more white cars than any other colour.
There are other reasons to buy a white car over black. Like black cars are very hard to keep clean and looking good, and also govt departments tend to buy white cars as do people who want to put on livery.
And mythbusters were testing the difference in temperature in the sun, not that people buy more white cars than others.
AwesomeO said:
mollwollfumble said:
AwesomeO said:Makes a difference inside black or white cars.
Interior color yes, very, but exterior colour not much at all. Or so I’ve heard, all the cars other than my most recent two have been white. The most recent two, silver and mid blue, haven’t had all that much internal temperature difference, but I haven’t had the mid blue one through mid-summer yet.
The importance of interior colour is that reflected/scattered light passes back out through the windows keeping the car cool whereas emitted IR is reflected back in by the windows. So interior white is a huge help for temperature, but a disaster for vision out through the windscreen. In exterior colour, both the reflected light and emitted IR cool the car, so it doesn’t make nearly as much difference.
It’d be interesting to test this out in a physical experiment, Mythbusters style. Measure the interior temperatures of 5 or more cars with different exterior colours in the same location after sitting in the Sun for the same length of time on a hot day.
Mythbusters did do it, the White car was cooler Inside.
AwesomeO said:
roughbarked said:
AwesomeO said:Mythbusters did do it, the White car was cooler Inside.
They didn’t need to do it. The customers have religiously purchased more white cars than any other colour.
There are other reasons to buy a white car over black. Like black cars are very hard to keep clean and looking good, and also govt departments tend to buy white cars as do people who want to put on livery.
And mythbusters were testing the difference in temperature in the sun, not that people buy more white cars than others.
Still, and all. Word of mouth says. My car is cooler than yours depite being easier to see.
Interestingly, in California, the most popular motor car colour by far is black.
Michael V said:
Interestingly, in California, the most popular motor car colour by far is black.
Trendsetters. Apart from the keeping clean aspects, the cooling of cars, any cars will be less of an issue in the future where people can switch on the air-conditioning/ heating by an app on the phone so that they get into an already climate adjusted car.
Keeping the car clean. Hahahahaha…..
Not around here. Black cars or dirt-coloured cars all end up looking the same.
AwesomeO said:
Michael V said:
Interestingly, in California, the most popular motor car colour by far is black.
Trendsetters. Apart from the keeping clean aspects, the cooling of cars, any cars will be less of an issue in the future where people can switch on the air-conditioning/ heating by an app on the phone so that they get into an already climate adjusted car.
What if someone hacks your car and turns up the heat :-)
try putting your hand on the bodywork of a black car in the midday sun
then try it on a white car
the difference is noticeable
but consider this…. imagine if a city was painted black from top to bottom – how uncomfortable in the midday sun would it become?