Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-18-2019, 03:44 AM   #11 (permalink)
EcoModding Lurker
 
Join Date: Mar 2017
Location: Brisbane Australia
Posts: 48
Thanks: 4
Thanked 5 Times in 4 Posts
I remember reading an article on different paint colours on cars.
Essentially there was no difference in the maximum internal temp any car reached regardless of the colour, the only difference was the amount of time it took to get to that temp and there was only about 10min in it.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-18-2019, 10:20 AM   #12 (permalink)
Redneck Ecomodder
 
Join Date: Feb 2019
Location: North Dakota
Posts: 315

Dent-Mobile - '99 Buick Lesabre
90 day: 22.68 mpg (US)

Red Rocket - '92 Geo Metro Base
Thanks: 5
Thanked 49 Times in 41 Posts
Quote:
Originally Posted by Jez77 View Post
I remember reading an article on different paint colours on cars.
Essentially there was no difference in the maximum internal temp any car reached regardless of the colour, the only difference was the amount of time it took to get to that temp and there was only about 10min in it.
I guess I have a hard time believing that. I have a white pickup and we just sold our black van. I could get in the pickup in the summer sun, roll the windows down and it was fine immediately. The van however was always dramatically hotter inside, though I never took temperature readings, it's very obvious from just what I've seen with my own cars it makes a difference.
__________________
  Reply With Quote
Old 04-18-2019, 10:21 AM   #13 (permalink)
Redneck Ecomodder
 
Join Date: Feb 2019
Location: North Dakota
Posts: 315

Dent-Mobile - '99 Buick Lesabre
90 day: 22.68 mpg (US)

Red Rocket - '92 Geo Metro Base
Thanks: 5
Thanked 49 Times in 41 Posts
I'll also add the van also had a black dash and black leather seats, possibly the worst combination anyone ever came up with.
__________________
  Reply With Quote
Old 04-18-2019, 11:12 AM   #14 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: Vermont
Posts: 3,458

Gaptooth (retired) - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.26 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)

Connect - '15 Ford Transit Connect XL
90 day: 24.35 mpg (US)

K-sight - '00 Honda K-sight
90 day: 41.61 mpg (US)
Thanks: 1,267
Thanked 1,404 Times in 895 Posts
Buy a $5 IR gun on Amazon and go around a parking lot one day, pointing it at people's cars.
  Reply With Quote
The Following User Says Thank You to Ecky For This Useful Post:
freebeard (04-21-2019)
Old 04-18-2019, 11:22 AM   #15 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,194

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 64.33 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,843
Thanked 1,537 Times in 1,049 Posts
Quote:
Originally Posted by Shaneajanderson View Post
So here's what I think I'm going to do.

I need some of this roof coating for my camper anyway, so I'm going to get a bucket of that. Then I'll get some automotive paint in a few colors: I'm thinking red and blue (a light and dark variant of each), black, and white. I'll get some test coupons of some thin aluminum from work, paint each color on one of them, and coat one with the roof stuff. I'll let them sit in the sun for about 3 hours (or until they all reach a steady temperature) and record their resting temp.

Any input on this test? should be some interesting data.

Edit: I will paint ONE color on each coupon.
Tests are always welcome around here, but this one might not tell you much about what you would actually experience in your vehicle: the greenhouse effect from all the glass and closed interior as well as the cooling effect on the metal of hurtling down the roadway at X mph are not accounted for in this planned test and they will effect actual heat and comfort in the car.

I can touch the inside of my black roof from my driver seat through a hole where the sun visor used to connect before I deleted it. I have tested repeatedly the temp difference between how it feels when I first step in on a sunny day and how it feels when I have been driving. It's often the difference between scorching hot and cool to the touch.

I don't doubt your test can find differences in temps correlted to color. I have seen the tests that show higher temps inside a black car than inside a white one after a few minutes, even after a few minutes of subsequent AC use to bring temps down. But such tests assumes we get into a 130* car and just sit there with the windows and doors closed for 10 minutes sweating while the AC slowly brings the temp to 85*. Who does that? No, we open the windows to let the hottest air out and start driving. The ambient temp comes down fast as hot cabin air escapes and the metal temps on the exterior of the car also drop (how fast?), regardless of color.

I think light colored interior is where it is at, though. Anyone who has driven a car with black leather seats knows they do not cool off, like ever.
__________________


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

  Reply With Quote
Old 04-18-2019, 12:02 PM   #16 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: Vermont
Posts: 3,458

Gaptooth (retired) - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.26 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)

Connect - '15 Ford Transit Connect XL
90 day: 24.35 mpg (US)

K-sight - '00 Honda K-sight
90 day: 41.61 mpg (US)
Thanks: 1,267
Thanked 1,404 Times in 895 Posts
I prefer a dark dashboard, because a light colored one can be blindingly bright in some conditions. Everything else can be light though.
  Reply With Quote
Old 04-18-2019, 12:21 PM   #17 (permalink)
Redneck Ecomodder
 
Join Date: Feb 2019
Location: North Dakota
Posts: 315

Dent-Mobile - '99 Buick Lesabre
90 day: 22.68 mpg (US)

Red Rocket - '92 Geo Metro Base
Thanks: 5
Thanked 49 Times in 41 Posts
Quote:
Originally Posted by California98Civic View Post
Tests are always welcome around here, but this one might not tell you much about what you would actually experience in your vehicle: the greenhouse effect from all the glass and closed interior as well as the cooling effect on the metal of hurtling down the roadway at X mph are not accounted for in this planned test and they will effect actual heat and comfort in the car.

I can touch the inside of my black roof from my driver seat through a hole where the sun visor used to connect before I deleted it. I have tested repeatedly the temp difference between how it feels when I first step in on a sunny day and how it feels when I have been driving. It's often the difference between scorching hot and cool to the touch.

I don't doubt your test can find differences in temps correlted to color. I have seen the tests that show higher temps inside a black car than inside a white one after a few minutes, even after a few minutes of subsequent AC use to bring temps down. But such tests assumes we get into a 130* car and just sit there with the windows and doors closed for 10 minutes sweating while the AC slowly brings the temp to 85*. Who does that? No, we open the windows to let the hottest air out and start driving. The ambient temp comes down fast as hot cabin air escapes and the metal temps on the exterior of the car also drop (how fast?), regardless of color.

I think light colored interior is where it is at, though. Anyone who has driven a car with black leather seats knows they do not cool off, like ever.
Good points. I was mainly thinking this would be a good way to start testing for cheap. Ie. if I found significant differences here then I could build a box with a window in each color, etc. But if there was no significant difference on even just a flat panel there would be no need to invest for time and money into the effort.

So then another thought I had: what effect does window tint have? afterall it blocks most light from getting through, but being black does it reflect that light, or just absorb it and turn it to heat? (Full disclosure: I have done 0 research on this thought yet, just popped into my head.)
__________________
  Reply With Quote
Old 04-18-2019, 12:23 PM   #18 (permalink)
Redneck Ecomodder
 
Join Date: Feb 2019
Location: North Dakota
Posts: 315

Dent-Mobile - '99 Buick Lesabre
90 day: 22.68 mpg (US)

Red Rocket - '92 Geo Metro Base
Thanks: 5
Thanked 49 Times in 41 Posts
Quote:
Originally Posted by Ecky View Post
Buy a $5 IR gun on Amazon and go around a parking lot one day, pointing it at people's cars.
This is an idea. No way to control for exposure time though, unless I sit and watch them for a while. Maybe with a large enough sample size that wouldn't matter.

I like medium grey dashes, seems to be the best middle ground. Also flat finished, I've had a couple cars with satin dashboards and they were terrible with low angle sunlight.
__________________
  Reply With Quote
The Following User Says Thank You to Shaneajanderson For This Useful Post:
hayden55 (04-18-2019)
Old 04-18-2019, 01:07 PM   #19 (permalink)
Master EcoModder
 
Join Date: Dec 2010
Location: arkansas
Posts: 488

"Proper Shitbox" (SOLD) - '96 Honda Civic LX fully optioned no weight reduction
90 day: 41.9 mpg (US)

Plue Brius - '10 Toyota Prius II
90 day: 57.73 mpg (US)

The Smoke Bomb - '96 Ford Ranger
Thanks: 148
Thanked 82 Times in 67 Posts
Quote:
Originally Posted by Jez77 View Post
I remember reading an article on different paint colours on cars.
Essentially there was no difference in the maximum internal temp any car reached regardless of the colour, the only difference was the amount of time it took to get to that temp and there was only about 10min in it.
I've always read the exact opposite.

"The researchers developed a thermal model that predicted the air conditioning capacity (rate of heat removal) required to cool each vehicle to a comfortable final temperature of 25C (77F) within 30 minutes. (This is an industry standard for vehicle air conditioner performance.) Based on the experimental measurements, the analysis predicted that the capacity required to cool the cabin air in the silver car is 13% less than that required in the black car."

"Using a white or silver paint (solar reflectance = 0.60) instead of a black paint would raise fuel economy by 0.44 mpg (2.0 percent). It would also decrease carbon dioxide emissions by 1.9%, and reduce other automotive emissions by about 1%."

https://eta.lbl.gov/news/article/110...duce-emissions

I know the Prius has a 4500w HVAC so that would equate to about 292.5 watts saved for that 30 minutes then level off. That's pretty significant given its smaller hybrid battery and how much using the hvac kills the battery around town when the engine is off at stop signs or coasting.

I remember reading a more detailed report in 2016 on window tints, and vehicle colors but I couldn't find that one.

I second the IR gun in a parking lot. You could easily measure roof surface temp and cabin temp with them. I'm gonna do that one day when I'm roaming around campus with my IR gun.

I'd say when you get some measurements buy a can of white plastidip and have at it.
__________________
"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."

2010 Prius
1996 Ranger
1987 Bass Tracker 70hp Yamaha
1970s 15' Water Rover 30hp Yamaha
2009 Suzuki GS500F

Last edited by hayden55; 04-18-2019 at 01:16 PM..
  Reply With Quote
The Following User Says Thank You to hayden55 For This Useful Post:
ToddT58 (05-17-2019)
Old 04-18-2019, 01:40 PM   #20 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,194

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 64.33 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,843
Thanked 1,537 Times in 1,049 Posts
Quote:
Originally Posted by Shaneajanderson View Post
... So then another thought I had: what effect does window tint have? afterall it blocks most light from getting through, but being black does it reflect that light, or just absorb it and turn it to heat? (Full disclosure: I have done 0 research on this thought yet, just popped into my head.)
I have very high quality (and expensive) ceramic and metallic heat rejecting tint on my car. I can feel very significant and Marge difference if I roll the window down versus rolling it up from the Sun on my skin. That's not science of course, but it confirms some of what testers have shown.

__________________


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com