Experimental development and testing of low-cost scalable radiative cooling materials for building applications

Carlosena, Laura; Andueza, A.; Torres, L H; Irulegi, O.; Hernández-Minguillón, Rufino; Sevilla, J.; Santamouris, M.

doi:10.1016/j.solmat.2021.111209

Cited by 36 publications

(16 citation statements)

References 48 publications

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“…As a result, these materials have achieved more significant temperature reduction than CMs. A recent, low‐cost scalable and sprayable polymeric materials reduced the baer substrates' temperature, under non‐ideal climatic conditions with relative humidity up to 63%, up to 12°C temperature drops compared to the substrate (Carlosena et al., 2021). By maximizing the rejection of solar radiation and energy dissipation during all hours of the diurnal cycle, radiative cooling devices reach sub‐ambient cooling under the direct sun without consuming additional energy while also reducing temperatures during nighttime hours (Z. Chen et al., 2016; Santamouris & Feng, 2018).…”

Section: Introductionmentioning

confidence: 99%

Exploring the Meteorological Impacts of Surface and Rooftop Heat Mitigation Strategies Over a Tropical City

et al. 2023

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Different heat mitigation technologies have been developed to improve the thermal environment in cities. However, the regional impacts of such technologies, especially in the context of a tropical city, remain unclear. The deployment of heat mitigation technologies at city‐scale can change the radiation balance, advective flow, and energy balance between urban areas and the overlying atmosphere. We used the mesoscale Weather Research and Forecasting model coupled with a physically based single‐layer urban canopy model to assess the impacts of five different heat mitigation technologies on surface energy balance, standard surface meteorological fields, and planetary boundary layer (PBL) dynamics for premonsoon typical hot summer days over a tropical coastal city in the month of April in 2018, 2019, and 2020. Results indicate that the regional impacts of cool materials (CMs), super‐cool broadband radiative coolers, green roofs (GRs), vegetation fraction change, and a combination of CMs and GRs (i.e., “Cool city (CC)”) on the lower atmosphere are different at diurnal scale. Results showed that super‐cool materials have the maximum potential of ambient temperature reduction of 1.6°C during peak hour (14:00 LT) compared to other technologies in the study. During the daytime hours, the PBL height was considerably lower than the reference scenario with no implementation of strategies by 700 m for super‐cool materials and 500 m for both CMs and CC cases; however, the green roofing system underwent nominal changes over the urban area. During the nighttime hours, the PBL height increased by CMs and the CC strategies compared to the reference scenario, but minimal changes were evident for super‐cool materials. The changes of temperature on the vertical profile of the heat mitigation implemented city reveal a stable PBL over the urban domain and a reduction of the vertical mixing associated with a pollution dome. This would lead to crossover phenomena above the PBL due to the decrease in vertical wind speed. Therefore, assessing the coupled regional impact of urban heat mitigation over the lower atmosphere at city‐scale is urgent for sustainable urban planning.

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Section: Introductionmentioning

confidence: 99%

Exploring the Meteorological Impacts of Surface and Rooftop Heat Mitigation Strategies Over a Tropical City

et al. 2023

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“…[1] From this perspective, eco-friendly building materials for commercial and residential construction have been substantially developed to meet the global consensus of achieving net-zero emissions. Recently, passive radiative cooling has gained attention as an attractive solution to address this challenging issue due to its advantages such as low cost, [2,3] compactness, [4,5] energy efficiency, [6,7] and zero carbon emissions. [8] Passive radiative cooling takes advantage of strong reflectance in the solar spectrum region (0.3-2.5 μm) and high thermal emission in the long-wave infrared region (LWIR; 8-13 μm).…”

Section: Introductionmentioning

confidence: 99%

Scalable, Patternable Glass‐Infiltrated Ceramic Radiative Coolers for Energy‐Saving Architectural Applications

Jeon

Kim

et al. 2023

Advanced Science

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A huge concern on global climate/energy crises has triggered intense development of radiative coolers (RCs), which are promising green‐cooling technologies. The continuous efforts on RCs have fast‐tracked notable energy‐savings by minimizing solar absorption and maximizing thermal emission. Recently, in addition to spectral optimization, ceramic‐based thermally insulative RCs are reported to improve thermoregulation by suppressing heat gain from the surroundings. However, a high temperature co‐firing process of ceramic‐based thick film inevitably results in a large mismatch of structural parameters between designed and fabricated components, thereby breaking spectral optimization. Here, this article proposes a scalable, non‐shrinkable, patternable, and thermally insulative ceramic RC (SNPT‐RC) using a roll‐to‐roll process, which can fill a vital niche in the field of radiative cooling. A stand‐alone SNPT‐RC exhibits excellent thermal insulation (≈0.251 W m−1 K−1) with flame‐resistivity and high solar reflectance/long‐wave emissivity (≈96% and 92%, respectively). Alternate stacks of intermediate porous alumina/borosilicate (Al2O3‐BS) layers not only result in outstanding thermal and spectral characteristics, causing excellent sub‐ambient cooling (i.e., 7.05 °C cooling), but also non‐shrinkable feature. Moreover, a perforated SNPT‐RC demonstrates its versatility as a breathable radiative cooling shade and as a semi‐transparent window, making it a highly promising technology for practical deployment in energy‐saving architecture.

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“…Therefore, developing a cooling technology which cools without any power input can make a significant difference in energy savings by reducing the use of air conditioners. Multiple applications − can take advantage of this cooling method beyond building cooling, such as improvements in the thermal comfort of textiles for personal thermal management − or improvements in the efficiency of electronic devices by avoiding overheating. , Different approaches have been explored, such as multilayers, , paints, , photonic structures, ,, porous − or metallized polymers, polymer dielectric composites, and natural materials. , The porous nanostructures have shown the best results, , becoming an interesting characteristic to improve the cooling performance of a material. This has encouraged scientific research on porous anodic aluminum oxide (AAO) nanostructures, which is an amorphous material with an isotropic permittivity, a strong acoustic resonance absorption at the far IR (15–25 μm), and high transparency in the UV–vis–NIR range …”

Section: Introductionmentioning

confidence: 99%

Suitability of Anodic Porous Alumina as a Passive Radiative Cooler: An In-Depth Study

Díaz-Lobo,

Martin-Gonzalez,

Morales-Sabio

et al. 2023

ACS Appl. Opt. Mater.

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Passive radiative cooling technology has the potential to revolutionize the way of cooling buildings and devices, while also helping to reduce the carbon footprint and energy consumption. Pioneer works involving anodic aluminum oxide (AAO) nanostructures showed controversial results. In this work, we clarify how the morphological properties and chemical structure of AAO−Al samples affect their optical properties and their cooling performance. Changes in thickness, interpore distance, and porosity of the alumina layer, as well as the used counterions, significantly affect the cooling ability of the AAO−Al structure. We measure a maximum temperature reduction, ΔT, of 8.0 °C under direct sunlight on a summer day in Spain, coinciding with a calculated peak cooling power, P cool , of 175 W/m 2 , using an AAO−Al sample anodized in sulfuric acid, with 12 μm of AAO thickness and 10% of porosity. These results represent a significant improvement over previous studies, demonstrating the potential of AAO nanostructures to be used in thermal management applications.

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Experimental development and testing of low-cost scalable radiative cooling materials for building applications

Cited by 36 publications

References 48 publications

Exploring the Meteorological Impacts of Surface and Rooftop Heat Mitigation Strategies Over a Tropical City

Exploring the Meteorological Impacts of Surface and Rooftop Heat Mitigation Strategies Over a Tropical City

Scalable, Patternable Glass‐Infiltrated Ceramic Radiative Coolers for Energy‐Saving Architectural Applications

Suitability of Anodic Porous Alumina as a Passive Radiative Cooler: An In-Depth Study

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