Optical properties across the solar spectrum and indoor thermal performance of cool white coatings for building energy efficiency

Song, Zhongnan; Zhang, Weidong; Shi, Yujia; Song, Jian; Qu, Jian; Qin, Jie; Zhang, Tao; Li, Yanwen; Zhang, Hongqiang; Zhang, Rongpu

doi:10.1016/j.enbuild.2013.03.051

Cited by 67 publications

(17 citation statements)

References 31 publications

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“…Normally the reflection of solar energy is empirically obtained by the use of white paints, which produce a beautiful effect but is little useful and acceptable in big cities. Normal paints containing titanium dioxide (TiO 2 ) as white pigments reflect visible and IR radiation very well [7] . TiO 2 is the most employed pigment in the formulation of paints; it is an ingredient which improves the quality of paint ensuring high coverage power, durability, brightness and opacity [8] .…”

Section: Introductionmentioning

confidence: 99%

Development of paints with infrared radiation reflective properties

et al. 2015

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SbstractLarge buildings situated in hot regions of the Globe need to be agreeable to their residents. Air conditioning is extensively used to make these buildings comfortable, with consequent energy consumption. Absorption of solar visible and infrared radiations are responsible for heating objects on the surface of the Earth, including houses and buildings. To avoid excessive energy consumption, it is possible to use coatings formulated with special pigments that are able to reflect the radiation in the near-infrared, NIR, spectrum. To evaluate this phenomenon an experimental study about the reflectivity of paints containing infrared-reflective pigments has been made. By irradiating with an IR source and by measuring the surface temperatures of the samples we evaluated: color according to ASTM D 2244-14, UV/VIS/NIR reflectance according to ASTM E 903-12 and thermal performance. Additionally, the spectral reflectance and the IR emittance were measured and the solar reflectance of the samples were calculated. The results showed that plates coated with paints containing IR-reflecting pigments displayed lower air temperature on the opposite side as compared to conventional coatings, indicating that they can be effective to reflect NIR and decrease the temperature of buildings when used in roofs and walls.

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Section: Introductionmentioning

confidence: 99%

Development of paints with infrared radiation reflective properties

et al. 2015

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“…1 and Table 4, white cement has weak reflectance over the entire solar spectrum. When used to prepare waterproof coatings, the resultant product possesses even lower solar reflectance of 0.22, which is much smaller than the solar reflectance of reinforced concrete (approximately 0.41) [28] because white cement is one of the main components and it has very strong absorption over the entire solar spectrum. Such a low solar reflectance inevitably increases the heat gain of buildings if the coating were applied to their exteriors to prevent the water from penetrating into the concrete.…”

Section: Optical Propertiesmentioning

confidence: 98%

“…As noted in our previous works [28,[30][31][32], the true cooling effect of a coating can be evaluated in two ways. The coating's surface temperature can be directly measured under the sun on a sunny, calm summer day (i.e., a sunny summer day without wind).…”

Section: Estimated Thermal Propertiesmentioning

confidence: 99%

The study of an energy efficient cool white roof coating based on styrene acrylate copolymer and cement for waterproofing purpose—Part I: Optical properties, estimated cooling effect and relevant properties after dirt and accelerated exposures

Xue

Yang

Zhang

et al. 2015

Construction and Building Materials

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“…7, the gelation time of sodium silicate-based concrete sealers decreases as the testing temperature increases, which is also in accordance with expectation. Clearly, if a concrete sealer is used in summer, when the surface temperature of concrete roof is easy to reach 70-80°C [33,34], some retarders should be added into the sealer to retard the gelation process for a deeper penetration of the concrete sealer and thus a better waterproofing performance.…”

Section: Gelation Timementioning

confidence: 99%