06-20-2015, 02:55 AM
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#31 (permalink)
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Moving, the difference is less, but it's still there, in my experience.
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06-24-2015, 04:58 AM
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#32 (permalink)
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The brake pedal is evil
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Quote:
Originally Posted by California98Civic
I am pretty sure that this has been discussed in another thread. But anyway, I decided not to do any painting in the end. The reason was the realization that once the car is moving the aerodynamic flow of air cools all the cars about equally. My car is black. Parked the roof gets wicked hot. Go for a drive and it cools down pretty fast. I doubt a while roof is a lot cooler when in motion. This means metalized or ceramic dark tint is your better cabin-cooling strategy, and I have already had that for four years (got lifetime warranty).
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What tint are you using? I'm running untinted windows still and am looking for a street legal window tint. |
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06-24-2015, 01:28 PM
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#33 (permalink)
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Cyborg ECU
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film types
Quote:
Originally Posted by H-Man
What tint are you using? I'm running untinted windows still and am looking for a street legal window tint.
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I got metalized tint and as dark as lawful. It's limo dark. My wife has ceramic tint in her car. 4 years and no fading, bubbling, peeling. Great stuff. Check out the types here: Johnson Window Films, Dealer Resource Center
James
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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.
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07-16-2015, 12:35 AM
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#34 (permalink)
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Wait, so you mean I've been doing it wrong?
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07-16-2015, 02:27 PM
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#35 (permalink)
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Less gas=longer road trip
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I like the white roof on your ' Cruiser a lot! I have an old (1995) outstandingly clean "Box Jeep" - Cherokee with 4 liter 6 and stick shift. The old 4.0 is designed to run warm, and I live in Colorado, so if it's hot I am jeeping in the wrong place! All this adds up to: I removed the Jeep Cherokee's air conditioning radiator from in front of the engine radiator. An immediate drop in operating temperature has been my reward. Now I plan to paint my roof white (very carefully, it's a clean Jeep...) like your ' Cruiser!
White roofs look awesome on many vehicles - your ' Cruiser, the Mini Cooper, and my Jeep Cherokee being just three.
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10-03-2022, 03:19 AM
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#37 (permalink)
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Necroing this to say the type of white pigment is important:
IIRC
This guy, who does the research, then makes it DIY, found that Calcium Carbonate (Whitewash) pigment was best at reflecting the IR light that heated surfaces and made paint:
He provides links to the science in the comments.
That's not going to work on dashboards reflecting in the windscreen and disrupting your view of the road, so thx for the window film info. |
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10-03-2022, 01:49 PM
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#38 (permalink)
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'infrared'
I believe that the 'process' involves reflecting as much of the visible and ultraviolet back towards space, before it ever has an opportunity to transform into long-wave infrared after is strikes the surface.
Flat-white is best for that. Not any 'glossy' surface.
And even with the best albedo, given enough 'time' in the sun, the car will reach the same temp. as a 'black' car. It just takes longer.
And something not mentioned is 'latent' load.
Relative humidity is often the 'reason' why air conditioning is used. It's not just the dry-bulb temperature.
Around 'local' dewpoint temperature, air is 'saturated' with water vapor. It's impossible for perspiration on your body to 'evaporate', which, otherwise could make one comfortable.
Where I live, 80-degrees can feel like 104! And it can kill you.
I agree that reducing the solar load can reduce energy consumption, but it must be taken within the context of human factors and human physiology.
'Cooling', without dehumidification only 'INCREASES' relative humidity, and the Heat-Index. It's why we have 'refrigerated-air'.
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10-03-2022, 02:59 PM
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#39 (permalink)
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Quote:
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I believe that the 'process' involves reflecting as much of the visible and ultraviolet back towards space, before it ever has an opportunity to transform into long-wave infrared after is strikes the surface.
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aerohead does not believe in the Atmospheric Window.
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10-03-2022, 06:23 PM
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#40 (permalink)
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Master EcoModder
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Quote:
Originally Posted by aerohead
I believe that the 'process' involves reflecting as much of the visible and ultraviolet back towards space, before it ever has an opportunity to transform into long-wave infrared after is strikes the surface.
Flat-white is best for that. Not any 'glossy' surface.
And even with the best albedo, given enough 'time' in the sun, the car will reach the same temp. as a 'black' car. It just takes longer.
And something not mentioned is 'latent' load.
Relative humidity is often the 'reason' why air conditioning is used. It's not just the dry-bulb temperature.
Around 'local' dewpoint temperature, air is 'saturated' with water vapor. It's impossible for perspiration on your body to 'evaporate', which, otherwise could make one comfortable.
Where I live, 80-degrees can feel like 104! And it can kill you.
I agree that reducing the solar load can reduce energy consumption, but it must be taken within the context of human factors and human physiology.
'Cooling', without dehumidification only 'INCREASES' relative humidity, and the Heat-Index. It's why we have 'refrigerated-air'.
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er... The vid's good because this guy delved into the science and engineered a paint that works.
so... watch it, or not..
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