Thermal evaluation of a room coated by thin urethane nanocomposite layer coating for energy-saving efficiency in building applications

Azemati, Ali Akbar; Koloor, Seyed Saeid Rahimian; Khorasanizadeh, Hossein; Sheikhzadeh, Ghanbar Ali; Hadavand, Behzad Shirkavand; Eldessouki, Mohamed

doi:10.1016/j.csite.2022.102688

Cited by 12 publications

(4 citation statements)

References 44 publications

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“…The glass fillers create air gaps in the bulk of the coating [ 66 ]. Since the thermal conductivity of the air is approximately 10 times lower than that of the polyurethane-acrylic polymers [ 67 ], the presence of the microspheres reduces the coating’s ability to transmit heat. The impact of the filler is greatest on the temperature measured near the sample, but it also affects and reduces the values of T int .…”

Section: Resultsmentioning

confidence: 99%

Durability and Thermal Behavior of Functional Paints Formulated with Recycled-Glass Hollow Microspheres of Different Size

Calovi

Rossi

2023

Materials

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This study aims to assess the effect of hollow glass microspheres of different sizes derived from glass industry waste on the durability and thermal behavior of waterborne paint. The coatings were characterized by electron microscopy to investigate the distribution of the spheres and their influence on the layer morphology. The impact of the various glassy spheres on the mechanical feature of the coatings was assessed using the Buchholz hardness test and the Scrub abrasion test. The role of the spheres in altering the durability of the samples was analyzed by the salt spray exposure test and the electrochemical impedance spectroscopy measurements. Finally, a specific accelerated degradation test was carried out to explore the evolution of the thermal behavior of the composite coatings. Ultimately, this work revealed the pros and cons of using hollow glass spheres as a multifunctional paint filler, highlighting the size of the spheres as a key parameter. For example, spheres with adequate size (25–44 µm), totally embedded in the polymeric matrix, are able to reduce the thermal conductivity of the coating avoiding local heat accumulation phenomena.

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Section: Resultsmentioning

confidence: 99%

Durability and Thermal Behavior of Functional Paints Formulated with Recycled-Glass Hollow Microspheres of Different Size

Calovi

Rossi

2023

Materials

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“…Experimental ones mainly compare TBCs with traditional coatings or other insulation systems, with the aim of reducing building energy needs or improving indoor thermal comfort [33][34][35][36][37]. Simulations focus on evaluating building energy savings or optimizing building envelope design to improve user comfort and decrease energy consumption [38][39][40][41][42][43][44][45][46].…”

Section: Overview Of Advancements In Tbcs For Building Applicationsmentioning

confidence: 99%

“…• TBCs are often called "cool paints" in UHI papers and as reflective coatings even if some high emissive properties are mentioned; • Reflective paints are more efficient for avoiding solar energy absorption and reducing wall surface temperatures, with higher solar reflectances [33][34][35]45]; • Reflective paints can reduce inside air temperature in summer and increase it in winter, and so on, to be closer to the inside comfort temperature [35,[38][39][40][41][42][43][44] The TBC has to be placed outside the wall to be the most effective [38];…”

Section: Overview Of Advancements In Tbcs For Building Applicationsmentioning

confidence: 99%

Experimental and Numerical Analysis on a Thermal Barrier Coating with Nano-Ceramic Base: A Potential Solution to Reduce Urban Heat Islands?

Malet-Damour,

Bigot,

Rivière

2023

Eng

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Adopting a multiscale approach is crucial for optimizing urban and building performance, prompting inquiries about the link between a technology’s local efficiency (building scale) and its broader impact (city-wide). To investigate this correlation and devise effective strategies for enhancing building and city energy performance, we experimentally examined a commercial nano-ceramic Thermal Barrier Coating (TBC) on a small-scale building and assessed numerically its influence on mitigating Urban Heat Islands (UHIs) at a city scale, translated in our case by the use of the thermal comfort index: the Universal Thermal Climate Index (UTCI). Our results reveal that the coating significantly curbs heat transfer locally, reducing surface temperatures by over 50 ∘C compared to traditional roofs and attenuating more than 70% of heat flux, potentially alleviating air conditioning demands and associated urban heat effects. However, implementing such coatings across a city does not notably advance overall efficiency and might trigger minor overheating on thermal perception. Hence, while nano-ceramic coatings indirectly aid UHI mitigation, they are not a standalone fix; instead, an integrated strategy involving efficient coatings, sustainable urban planning, and increased vegetation emerges as the optimal path toward creating enduringly sustainable, pleasant, and efficient urban environments to counter urban heat challenges effectively.

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“…[14] And the application intended in this paper is the materials composites used for buildings structures. [15][16][17] To examine the thermomechanical properties of nanocomposites, various analytical, numerical, and experimental methods are available. These methods facilitate the determination of essential properties including the elastic modulus, tensile strength, fracture toughness, thermal conductivity, and thermal expansion coefficient.…”

Section: Introductionmentioning

confidence: 99%

Modeling effective elastic and thermal conductivity of composite materials reinforced with plastic waste: Analytical and numerical approaches

et al. 2023

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The properties of materials used in building are enhanced by adding nanoparticles for improve energy efficiency. The objective of this study is to offer both numerical and analytical modeling methods of the thermal conductivity and mechanical property of composite materials. Various mineral charges were employed to reinforce the organic matrices of saturated polyester resin (UPR) with calcium carbonate (CaCo3) and expanded perlite particles. The study employs the finite‐element software COMSOL to conduct a numerical investigation of thermal transport in an elementary cell. The purpose is to ascertain the thermal conductivity of composites and examine the impact of contact resistance and the volume fraction of nanoparticles on the effective thermal conductivity. The results indicate that the numerical model proposed is consistent with the Hashin‐Shtrikman analytical model and experimental measurements. In another hand, the mechanical property is computed based on Mori‐tanaka analytical model of homogenization and finite element method by Digimat‐MF/FE, which gives enhanced elastic behavior of composite in function of volume fraction of nanoparticles, with high Young modulus and low Poisson ratio. The results indicate the performance of nanoparticles in improving thermomechanical behavior of building materials, and also in other applications.

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Thermal evaluation of a room coated by thin urethane nanocomposite layer coating for energy-saving efficiency in building applications

Cited by 12 publications

References 44 publications

Durability and Thermal Behavior of Functional Paints Formulated with Recycled-Glass Hollow Microspheres of Different Size

Durability and Thermal Behavior of Functional Paints Formulated with Recycled-Glass Hollow Microspheres of Different Size

Experimental and Numerical Analysis on a Thermal Barrier Coating with Nano-Ceramic Base: A Potential Solution to Reduce Urban Heat Islands?

Modeling effective elastic and thermal conductivity of composite materials reinforced with plastic waste: Analytical and numerical approaches

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