How "ultra-white" paint can lower indoor temperature | Paint that can able to reduce home temperature by 4.5 °C | KNOW SCIENCE
Global warming is a serious issue. Emission of carbon dioxide and other global warming gas from industries, vehicles, and air conditioning systems will cause a rise in earth's temperature.
To reduce the effect of global warming, scientist and researchers work hard to find alternative technologies.
Recently, Prof. Xiulin Ruan (a Purdue University) and his team, developed a paint, called "ultra-white" paint.
Source: Purdue University |
Normal white paints possess 75- 85% reflectance.
Two materials were tested, CaCO3 and BaSO4.
Paint containing CaCO3 possesses 95.5% reflectance. The paint could cool up to 1.7 °C below the surrounding temperature.
Other paint containing BaSO4 and acrylic paint can reflect the sunlight at wavelength which enough to pass through the atmosphere. This paint possesses 98.1% reflectance.
It lowers the inner temperature by 4.5 degrees °C.
CaCO3 absorbs more sunlight (4.5%) than BaSO4 (absorbs 1.9% sunlight), because BaSO4 has a high electron bandgap, requires high energy to jump from the valence band to the conduction band.
Analysis shows it will save up to 70% air conditioning cost in the summer.
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