The sun is only actively forcing its energy on our buildings during 3-4 peak hours of the day and yet we expect comfort 24 hours of the day.Įarth receives energy from the sun in the form of solar radiation-radiation with varying wavelengths along the electromagnetic spectrum. It’s huge! But it only benefits energy efficiency for a few hours of the day. The above chart looks at how much energy makes the earth’s surface in the visual spectrum range. High solar reflectance (white paint) reduces direct sun energy absorption (albedo), hence a cool roof energy-saving claim is supported. 05, where most homes in Australia require ceiling insulation of R 4.1. As an example to justify this claim, the best insulation in the world (aerogel, k=0.02, so R=t/k=0.001/0.02=R 0.05 m².K/W) has an R-value of. ![]() Insulation with an R-value can also block this form of energy transfer because this type of energy is transferred into the building envelope via conduction.Īs a silver bullet argument, A paint/coating, 1 mm in thickness does not provide any meaningful insulation.
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