Energy savings of radiative cooling paints applied to residential buildings

Peoples, Joseph; Hung, Yu-Wei; Fang, Ziqi; Braun, James E.; Horton, W. Travis; Ruan, Xiulin

doi:10.1016/j.ijheatmasstransfer.2022.123001

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…As such, the Mie theory is employed often to evaluate micro and nanoscale features in response to solar wavelengths. 34 Previous investigations of the same fibrous HAP used in this work have illustrated the benefits of the fibrous morphology oversimple spherical particles. 31 The main advantage of this morphology is the introduction of enhanced broadband scattering performance compared to single particle sizes.…”

Section: Resultsmentioning

confidence: 77%

“…The Mie theory can be used to predict fundamental scattering parameters of materials of various scales and geometries, provided that the relevant length scales are comparable to incident wavelengths. As such, the Mie theory is employed often to evaluate micro and nanoscale features in response to solar wavelengths . Previous investigations of the same fibrous HAP used in this work have illustrated the benefits of the fibrous morphology oversimple spherical particles .…”

Section: Resultsmentioning

confidence: 99%

“…Additives may also be included to further modify paint properties, such as defoamers and drying agents. Binders are either water-based (usually acrylic), which mainly use water as a solvent, or oil-based, which tend to use organic compounds as solvents, such as turpentine . Linseed, safflower, poppy, and walnut oils are typical oil paint bases, especially for applications in art. , Acrylic paints are generally more common for consumer applications …”

Section: Introductionmentioning

confidence: 99%

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Nanofibrous Biomaterial-Based Passive Cooling Paint Structurally Linked by Alkane-Oleate Interactions

Caratenuto,

Leach,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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Passive radiative cooling materials, which provide cooling without consuming electricity, are widely recognized as an important technology for reducing greenhouse gas emissions and delivering thermal comfort to less industrialized communities. Optimizing thermal and optical properties is of primary importance for these materials, but for real-world utilization, ease of application and scalability also require significant emphasis. In this work, we embed the biomaterial hydroxyapatite, in the form of nanoscale fibers, within an oil-based medium to achieve passive cooling from an easy-to-apply paint-like solution. The chemical structure and bonding behaviors of this mixture are studied in detail using FTIR, providing transferable conclusions for pigment-like passive cooling solutions. By reflecting 95% of solar energy and emitting 92% of its radiative output through the atmospheric transparency window, this composite material realizes an average subambient cooling performance of 3.7 °C in outdoor conditions under a mean solar irradiance of 800 W m–2. The inflammability of the material provides enhanced durability as well as unique opportunities for recycling which promote circular economic practices. Finally, the surface structure can be easily altered to tune bonding behaviors and hydrophobicity, making it an ideal passive cooling coating candidate for outdoor applications.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanofibrous Biomaterial-Based Passive Cooling Paint Structurally Linked by Alkane-Oleate Interactions

Caratenuto,

Leach,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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“…Figure E maps the theoretical cooling power from 0 to 50 °C ambient temperature and 0 to 30 mm precipitable water. This model does not include the synergetic effect due to the higher emissivity of the adsorbed water under high humidity, making it a conservative estimate of the cooling power . The dashed line of 100% RH and the minimum 50 W/m 2 cooling power justify that radiative cooling is still viable under high relative humidity to aid water harvesting.…”

Section: Resultsmentioning

confidence: 99%

Atmospheric Water Harvesting by Large-Scale Radiative Cooling Cellulose-Based Fabric

et al. 2022

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Atmospheric water harvesting (AWH) has received tremendous interest because of population growth, limited freshwater resources, and water pollution. However, key challenges remain in developing efficient, flexible, and lightweight AWH materials with scalability. Here, we demonstrated a radiative cooling fabric for AWH via its hierarchically structured cellulose network and hybrid sorption–dewing mechanisms. With 8.3% solar absorption and ∼0.9 infrared (IR) emissivity, the material can drop up to 7.5 °C below ambient temperature without energy consumption via radiative cooling. Water adsorption onto the hydrophilic functional groups of cellulose is dominated by sorption at low relative humidity (RH) and dewing at high RH. The cellulose network provides desirable mechanical properties with entangled high-aspect-ratio fibers over tens of adsorption–extraction cycles. In the field test, the cellulose sample exhibited water uptake of 1.29 kg/kg at 80% RH during the night. The profusion of radiative cooling fabric features desirable cost effectiveness and allows fast deployment into large-scale AWH applications.

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Realization of highly thermally conductive radiative cooling paint

Hong,

Park

2024

J. Korean Phys. Soc.

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Energy savings of radiative cooling paints applied to residential buildings

Cited by 12 publications

References 22 publications

Nanofibrous Biomaterial-Based Passive Cooling Paint Structurally Linked by Alkane-Oleate Interactions

Nanofibrous Biomaterial-Based Passive Cooling Paint Structurally Linked by Alkane-Oleate Interactions

Atmospheric Water Harvesting by Large-Scale Radiative Cooling Cellulose-Based Fabric

Realization of highly thermally conductive radiative cooling paint

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