The consideration that every building is a combination of materials that can contribute to thermal efficiency is a promising avenue in innovative construction.

With the advent of developments in innovative materials consider for a moment what makes a Chromadek® roof cooler as it becomes hotter, when exposed to the sun.

The logic involved with heat reflectivity as an aspect of thermal efficiency starts with the explanation that dark colours absorb most of the visible light striking a surface while lighter colours reflect most of that solar energy.

This would suggest that colour is an indication of how much visible solar energy will be reflected. The amount of infrared energy that is reflected is often a function of the colour as well. Recently new pigment technology has been introduced into Chromadek® and Chromadek Ultim® to change that assumption. New Infra-Red (IR) reflective pigments in the Chromadek® and Chromadek Ultim® paint systems allow for certain colours to reflect more total solar energy.  

This exciting development ensures that Chromadek® and Chromadek Ultim® is available in a unique paint system that features pigment technology that increases total solar reflectance (TSR) with a corresponding lower surface temperature.

Four of the colours of the Chromadek® range, Charcoal Grey, Dark Dolphin, Buffalo Brown and Aloe Green utilise an advanced thermal technology paint system. This advanced paint system incorporates a heat reflective pigment providing up to an 8°C cooler surface temperature benefit with improved durability. The durability of an exterior coating is measured according to the colour coated surfaces capability in maintaining gloss, colour and film integrity.
 
How Heat Reflective Chromadek® works?
The heat reflective pigments in heat reflective Chromadek® is chemically inert and highly stable allowing heat reflective Chromadek® to reflect more of the sun’s energy preventing the coating from directly absorbing energy resulting in less heat build-up resulting in longer life-cycles (less fading).

To gain insight into heat reflective Chromadek®, a demonstration recently showcased at UIA2014 titled “The heat reflective aspects of Chromadek®, what you imagine you can see” captures the strides made in paint technology that enables Chromadek® to become cooler.

An extract from the recent UIA2014 demonstration shows that “seeing is believing” when it comes to heat reflective Chromadek®. The key aspect of the demonstration shows the visible contrast between the same heat reflective and non-heat reflective Chromadek® colour.  

 

   Video Image (300 – 700 nm)                                                         NIR Video Image (700 – 1100 nm)

The demonstration draws natural attention to the circled heat reflective colour appearing lighter therefore cooler, due to the heat reflective pigment, while the non-heat reflective colour remains darker therefore hotter. (NIR = Near Infrared)

In addition a darker colour can be configured through the application of heat reflective pigment to function as a lighter colour

  Video Image (300 – 700 nm)                                                        NIR Video Image (700 – 1100 nm)

To put this into a practical context
Where annual cooling loads dominate, a highly reflective and highly emissive colour coated steel roof is optimal for reducing energy consumption. Where annual heating loads dominate, an unpainted galvanised steel roof is more desirable because of its low infrared emittance.

Make the Chromadek® choice, the heat reflective benefit is a reality through
–    Lessened  peak loads on energy consumption
–    Improved roof durability, less thermal cycling leads to constant temperature
–    Reduced air conditioning usage & costs
–    Reduced heating consumption & costs
–    Improved thermal comfort

Remember if it doesn’t say Chromadek® it’s not Chromadek®, look out for the unique heat reflective Chromadek® colours that offer these benefits at no extra cost.

Since there’s more that meets the eye,  Chromadek® is the preferred steel colour coated roofing choice ideally suited to South Africa’s climatic conditions supported by its made in South Africa heritage.