Feb 2011

www.colourcoil.com

   Volume 6, Issue1   


Editor's Note

The new year came, left us and now we look forward to Chinese New Year celebrations. To our Chinese readers,

Gong Xi Fatt Cai
&
Happy Chinese New Year

In this issue we will quickly summarize as to why cool metal roofs are really way cooler than other roofs. As we all know, cool metal roofs manufactured from Colourcoil solar-reflective pre-painted steel can actually help you save energy costs. To understand how this works, let us take a closer look at the infrared-reflective pigments that are used for Colourcoil's solar reflective paint coatings.

Check out Colourcoil's latest ad by clicking on the relevant hyperlink at the top-right of this page. 

Thank you.

Jim
Team leader & Editor
Editor@colourcoil.com
www.colourcoil.com

 

 
 

Cool Roofing Metals


Click here to find out more

 
 

Previous e-Newsletter

Vol 5. Issue 3 Jun 2010
Vol 5. Issue 4 Aug 2010
Vol 5. Issue  5 Oct 2010
Vol 5. Issue 6 Dec 2010

Click on Articles of interest

a) GOOD DESIGN - Dissimilar
     (i.e. incompatible) Materials

b) Technical Journal - Steel
   Cladding for Animal
   Confinement Buildings

c) Beautiful Metal Roofs -
   Bungalow, Petaling Jaya

d) Beautiful Metal Roofs - The
    Gardens Midvalley, Kuala
    Lumpur

e) Energy Savings with Cool Metal
    Roofs

f) Urban Heat Island (UHI) & cool
   metal roofs

g) IKRAM Certification

h) Colourcoil recognized as an
    ENERGY STAR PARTNER

i) Radiative properties of cool
    metal roofs

j) Meeting Energy Star Solar-
    Reflective Roofing Requirements

k) Kynar 500 Resin is the best
    choice for "cool metal roofs"

l) What is a Cool Metal Roof

m) We are ISO9001:2008 certified

n) Strong value for green buildings

o) Colourcoil Kool colour charts -
    What's new inside

p) Green Building Index - Solar
    reflective index (SRI)
  
 requirements for roof

q) Cool Question - How does solar
    reflectance of metal roofing
    compares to other roofing
    material

Click here to view archives

 
 

Contacts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

www.colourcoil.com
info@colourcoil.com

 

 

ARTICLES
(1) Why Cool Metal Roofs are way Cool?

(2)
What Are Solar Infrared-Reflective Pigments?
(3 Colourcoil
Kool Colour Charts for metal roofs.
(4) Need more Info?

MEDIA

Click here


Why Cool Metal Roofs are way Cool?
A cool metal roof reflects and emits the sun’s energy as light back to the sky instead of allowing it to enter the building below as heat. In many climate zones, a cool metal roof can substantially reduce the cooling load of the building, providing several direct benefits to the building owner and occupants:

  • increased occupant comfort, especially during hot summer months

  • reduced air conditioning use, resulting in energy savings typically of 10-30%1, and

  • decreased roof maintenance costs due to longer roof life.


In addition to these well known benefits to the building owner, cool metal roofs benefit the environment and public health in far more ways. As recognition of these benefits has become more widespread, cool metal roof requirements are appearing in building energy codes and green building programs across the nation.
 

 

 

 

 

 

 



 

Cool metal roofs directly reduce green house gas emissions by conserving electricity for air conditioning therefore emitting less CO2 from power plants. Cool metal roofs also cool the world independently of avoided carbon emissions, simply by reflecting the sun’s energy as light back to the atmosphere, thereby mitigating global warming. A Lawrence Berkeley National Laboratory study found that world-wide reflective roofing will produce a global cooling effect equivalent to offsetting 24 gigatons of CO2 over the lifetime of the roofs. This equates to $600 billion in savings from CO2 emissions reduction.2
 

Climate Change
Mitigation

 

Cities can be 2° to 8°F warmer than surrounding areas due to dark materials, including roofs, which absorb the sun’s light energy as heat during the day and release it at night as heat.3 This phenomenon removes the opportunity for air to cool down at night and results in higher temperatures being maintained longer. By immediately reflecting solar radiation back into the atmosphere and reemitting some portion of it as infrared light, cool metal roofs result in cooler air temperatures for the surrounding urban environment during hot summer months.
 

Urban Heat
Island Mitigation

 

Cool metal roofs, through mitigation of the urban heat island effect and reduction of ambient air temperatures, in turn improve air quality. Smog is created by photochemical reactions of air pollutants and these reactions increase at higher temperatures. Therefore, by reducing the air temperature, cool metal roofs decrease the rate of smog formation.
 

Reduced Smog

 

Lower ambient air temperatures and the subsequent improved air quality also result in a reduction in heat-related and smog-related health issues, including heat stroke and asthma.
 

Public Health
Benefits

 

Because cool metal roofs reduce air-conditioning use during the day’s hottest periods, the associated energy savings occur when the demand for electricity is at its peak. Therefore, use of cool roofs reduces the stress on the energy grid during hot summer months and helps avoid shortages that can cause blackouts or brownouts. In addition, for building owners that pay for their energy based on the time of use, they save energy when it is at its most expensive – and hence, save more money!
 

Peak Energy
Savings and Grid
Stability

Cool metal roofs directly reduce the air conditioning use for buildings by reducing heat gain in the building below, but they also indirectly reduce air conditioning use in urban areas by helping lower ambient air temperatures. Therefore, with cooler daytime temperatures, buildings and vehicles use less air conditioning and save additional energy. In turn, this results in a reduction in the CO2 emissions from electricity generating power plants.

Secondary Energy
Benefits

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What Are Solar Infrared-Reflective Pigments ?
Global Warming and its effect on our planet has become an International issue. We in industry have an opportunity to participate in the reduction of global warming via the application of some of the latest technology to “color” our world in applications such as roofing, sidewalls and other exterior applications. Researchers in pigment technology have developed a new classification of pigments that are not only extremely durable, weather resistant and color-fast, but also possess a new property - “Solar”, or “Infrared” Reflectivity. This article will discuss this new class of pigments, what they are, the history of the technology, and the features and benefits of their use.

Solar Energy
Well, exactly what are Solar Infrared Reflecting Pigments? To answer this we must first examine what Solar Energy is. Solar Energy, or “electromagnetic radiation” from the sun, consists of radiation in the wavelengths from about 250 nanometers (nm) to about 2,500 nanometers.

  • Ultra Violet - The wavelengths less than 400 nm are referred to as the “Ultraviolet” (UV) region. The UV region contains the shorter wavelengths of radiation that can cause damage to our bodies and also causes much of the photo degradation to paints and polymers.

  • Visible Light - The range of wavelengths between 400 nm to 700 nm is called the visible region. This region is the area where our eyes are attuned to see light in all its various colors and shades.

  • Infrared - The final area from 700 nm to about 2500 nm is called the “Infrared” region. These longer infrared wavelengths are invisible to the naked eye, yet contain over half of the solar energy which strikes the earth.


We can see different colors by selective reflection and absorption of various wavelengths in the visible region. We can perceive a color such as a red car, because the radiation (wavelengths of light) in the red portion of the cars pigment (approximately in the range of 650 nm) is reflected back to our eyes, while the rest of the wavelengths (400 to 650 and above 650) are absorbed by the pigment. We can’t see above 700 nm which is the infrared portion of the spectrum, so we really can’t determine what is going on there by sight. However, we can feel the effects of this “Infrared Energy”, in the form of Heat! Touch your asphalt driveway, your conventional asphalt shingled roof, or your black car which has been out in the sun for a while. It’s quite Hot!! In fact some roofing products can reach surface temperatures above 190º F or more. Why is this? It’s because these materials absorb a large portion of the infrared (heat) radiation from the sun.

Technology Development
During the Cold War era scientists began working on pigments which were designed to be spectrally selective for military applications. These pigments were designed to mimic natures’ spectral reflectivity, so that man- made objects could not be observed by sophisticated detection equipment. A good example of this was to spectrally match leaves and trees so that military equipment that was painted with these pigments could not be observed by Infrared detectors while in wooded areas. The first pigments developed for this application were green and matched the spectral curve of the chlorophyll in leaves and grass. It just so happens that leaves and grasses are quite cool to the touch and are actually quite “Solar” or “Infrared” Reflective, thus Solar reflective pigments were born.

The first application of these pigments was for Military Camouflage coatings. It was not until the mid 1980’s that commercial applications were developed out of a need by the vinyl siding industry. It seemed that darker color vinyl siding could not be used commercially because as the temperature of dark colored siding increased, the product sagged on the side of homes. The vinyl siding industry came to Ferro Corporation and asked if they could develop a dark color pigment that could reflect heat and eliminate the distortion problem. Ferro did just that and Infrared Reflective pigments became a commercial success. As technology grew, a palette of colors became available that possessed this High Solar Reflectivity. Today, these same pigments are used in PVDF and Silicone Modified Polyester coatings commonly used for metal roofing applications.

Composition of the Pigments
Just exactly what are these cool pigments and why are they beneficial to industry? These Solar Infrared Pigments are basically synthetic mineral compounds known in the industry as CICP or Complex Inorganic Color Pigments. They are widely accepted as being the best quality pigments available. They are made by reacting mineral compounds together in a calcination process, where these minerals undergo a solid state reaction at temperatures up to 2200º F to make new color compounds. Not all CICP pigments are Solar Reflective however, and only those pigments designated as “Cool” or Reflective, possess the desired properties to reflect the Infrared Solar Radiation desired for today’s applications. Most CICP pigments possess extremely good durability and are well suited for exterior applications. They are widely used in coil coating applications, exterior building products and roofing. These new products are now in great demand and are replacing the currently used CICP products.

The Benefit to Cool Metal Roofing
That being said, why is cool metal roofing so important to industry? First of all, they are able to reflect much of the solar infrared radiation away from surfaces and direct it back out in to space so it does not get absorbed by the roofs and other applications where it is used. A typical black pigment such as carbon black, will reflect only about 3-4% of the total solar energy that strikes the surface. This means it absorbs about 96% of the solar energy which shines upon it and gets very hot!! In contrast a “Cool” black pigment in very dark color space can reflect about 25% of the Solar radiation and thereby remain cooler. How much cooler will the cool metal roof with these pigmented paint systems be? Theoretically, for every 1% (0.01) increase in a roof’s reflectivity the surface temperature could be 0.75ºF cooler, or for very 10% more reflective a roof surface is, it could be up to 7.5ºF cooler

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Colourcoil Kool Colour Charts for metal roofs
Colourcoil's flagship high performance pre-painted steel products, PVF2 SeriesTM and METALLIC PVF2 SeriesTM, for the downstream manufacturing of cool metal roofs, now come in a wide range of cool and exciting solar-reflective colours. They are Kynar 500® flurocarbon based, giving metal roofing manufacturers and end-users, building products with the best colour retention and durability properties the market has to offer.

High Performance pre-painted steel
(KOOL energy - efficient, solar reflective roofing metals)

Warranty* against colour fading, chalking and delamination Warranty* against corrosion Click on Pics to view our new colour charts**
 COLOURCOIL®  PVF2 SeriesTM 20 yrs 25 yrs
click here
 COLOURCOIL®  METALLIC PVF2
 Series
TM
20 yrs 25 yrs
click here
*  Terms & conditions apply
** We cannot guarantee accurate color reproduction, since the monitor settings vary from one computer to the
    next. To be certain of your choice, compare the color code with the corresponding color sample.

Architects, home owners or developers who are thinking of going green can now specify our flagship products for their metal roofs with confidence as they comply to Malaysia's GBI (Green Building Index) as well as U.S ENERGY STAR requirements. (Solar reflective (SR) and Solar Reflectance Index (SRI) values are published next to the colour chips in the colour charts).

Visit our website to learn more about our high performance pre-painted steel products and how our flagship products for cool metal roofs can help to reduce energy costs.

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Need more info?
Whether you are an architect, engineer, developer, house owner or a metal roofing or wall cladding manufacturer, our marketing team will be most delighted to discuss with you on your specific product requirements.

If you wish to make a factory visit, obtain a free brochure or complete specifications and colour charts, please contact our courteous and friendly marketing staff by calling the nearest office or just drop us an email at info@colourcoil.com.

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