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Добірка наукової літератури з теми "Cool coating"

Автор: Grafiati

Опубліковано: 11 березня 2023

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Статті в журналах з теми "Cool coating"

Rossi, Stefano, Hampus Lindmark, and Michele Fedel. "Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings." Coatings 10, no. 11 (November 23, 2020): 1135. http://dx.doi.org/10.3390/coatings10111135.

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This study aims to evaluate the difference in thermal behavior among paints with the presence of traditional and NIR pigments by means of a simple and cheap laboratory-scale test. Considering these goals, the thermal and esthetical properties of two different cool coatings were assessed, highlighting their positive and limited aspects. Two different complex near-infrared inorganic reflective (NIR) pigments with yellow and black respectably colors were mixed in an acrylic waterborne copolymer binder. The paint formulations were applied on steel panels. The thermal performance of the coatings was investigated in the NIR-region of the light spectrum by exposing the samples to an IR-lamp. The outer and inner surface temperatures of the painted panels were recorded using thermocouples and an IR camera. The samples were aged by artificial UV-B light exposure. Color and specular gloss changes at different exposure times were evaluated. The behavior of the cool coatings was compared with that of conventional coatings with similar color characteristics. The black cool coating achieved a maximum temperature decrease, compared to the conventional black one, of approximately 12 °C. The stability for the cool coatings was very similar to that of the conventional coating, indicating that black pigment could be a potential candidate for cool-coating applications. The yellow cool coatings did not show a significant decrease in temperature compared to the conventional paint. The gloss and color changes resulted as influenced by the types and amount of pigments.

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Zhang, Hai Yan, and Xue Min Hu. "Preparation of Cool Wool Natural Energy Storage Material." Advanced Materials Research 1004-1005 (August 2014): 849–52. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.849.

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Preparing of cool wool natural energy storage materials from wool fiber is a feasible and effective method. The structure characteristics of wool and the reason that wool has cool properties were introduced. The preparation principle, preparation methods and properties of cool wool fiber was studied. The preparation methods of cool wool mainly include scale stripping and surface coating. Scale stripping mainly consists of Chlorination, oxidation, biological enzyme treatment and plasma treatment. Surface coating mainly consists of resin finishing and ceramic finishing. Slenderizing and adding energy storage materials are also the effective methods. Wool as a new concept of natural energy storage material is recognized by people.

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Hu, Kui, Yujing Chen, Guixiang Chen, Yuzhou Duan, and Caihua Yu. "Proposed Cool Coatings with High Near-Infrared Reflectance and Heat Insulation for Asphalt Pavement." Coatings 11, no. 1 (January 13, 2021): 85. http://dx.doi.org/10.3390/coatings11010085.

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In summer, black asphalt pavement can absorb a considerable amount of solar radiation, which causes its temperature to rise. Heated asphalt pavement can aggravate the urban heat island (UHI) effect and transfer heat downward, which may cause the problem of permafrost thawing beneath pavements. The objective of this study was to develop a novel cool coating layer (CCL) with high near-infrared reflectance and heat insulation to make the surface of asphalt pavement cool. A self-developed test device and method was established to evaluate cooling effects. Based on the experimental results, the optimal coating can cool asphalt pavement by 11.21 °C when the radiation striking the sample surface is 650 W/m2. This coating, called the composite cool coating layer (CCCL), is composed of the following materials: polyurethane resin, rutile TiO2 of 18%, hollow glass microspheres of 12%, and copper chromite black spinel of 0.7%. Silicon carbide particles of 1 kg/m2 can help the CCCL achieve satisfactory antiskid performance. In conclusion, CCCL can effectively inhibit the absorption of solar radiation and reduce the flow of thermal energy downward without sacrificing skid resistance.

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Rosati, Andrea, Michele Fedel, and Stefano Rossi. "NIR reflective pigments to mitigate the urban heat islands effect (UHIE)." E3S Web of Conferences 172 (2020): 03006. http://dx.doi.org/10.1051/e3sconf/202017203006.

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For building applications, coatings are needed in order to obtain an attractive appearance and protection against the outdoor environments. Buildings are responsible for consumption of cooling energy. Cool coatings applied over buildings surface provide an effective solution for passive cooling of building indoors and influencing local outdoor microclimate, mitigating urban heat islands effect (UHIE). Cool coatings have to resistant to weathering and ageing. For this reason, we developed near infrared (NIR) reflective pigments with the aim to add in binder and obtaining a cool coating. A series of pigments displaying YIn0.9Mn0.1O3–ZnO stoichiometry was synthesized by sol-gel route. The dried gel precursor was calcined at different temperatures for 2h (650°C, 800°C and 850°C) to observe the formation of a light brown pigment and two different blue shades. Precursors and calcined final pigments were characterized by using physicochemical analyses. The colour of pigments was studied using CIE-2004 L*a*b* colorimetric method. The cooling effect of pigments and their thermal stability were confirmed by NIR reflectance measurements and TGA respectively.

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Szczucka-Lasota, B., T. Węgrzyn, Z. Stanik, J. Piwnik, and P. Sidun. "Selected Parameters of Micro-Jet Cooling Gases in Hybrid Spraying Process." Archives of Metallurgy and Materials 61, no. 2 (June 1, 2016): 621–24. http://dx.doi.org/10.1515/amm-2016-0105.

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Abstract The innovative technology, like thermal spraying with a micro-jet cooling is one of the important modification of classical ultrasonic spraying methods. Using of micro-stream with gases like argon or nitrogen allows to cool the coating immediately after spraying, and thereby reduce the time of transition during the injection of each layer. As a result of the process, the fine dispersive structure of coatings is obtained during the shorter time in comparable to the classical high velocity oxygen fuel process (HVOF). The parameter of process and the type of stream equipment determine the quality of the obtained structure and thermal stress in the coating. The article presents the relationship between selected parameters of hybrid process and properties of the coatings. The presented technology should be adapted to the actual production of protective coating for machines and construction working in wear conditions.

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Chen, Yujing, Kui Hu, and Shihao Cao. "Thermal Performance of Novel Multilayer Cool Coatings for Asphalt Pavements." Materials 12, no. 12 (June 13, 2019): 1903. http://dx.doi.org/10.3390/ma12121903.

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Cool coatings are typically used to address high-temperature problems with asphalt pavements, such as rutting. However, research on the effect of the coating structure on the cooling performance remains a major challenge. In this paper, we used a three-layer cool coating (TLCC) to experimentally investigate the effects of the reflective layer, the emissive layer, and the thermal insulation layer on the cooling effect using a self-developed cooling effect evaluation device (CEED). Based on the test results, we further established temperature fields inside uncoated and coated samples, which were used to study how the TLCC affects the inner temperature field. Our results showed that the reflective layer was the main parameter influencing the cooling effect (8.18 °C), while the other two layers were secondary factors that further improved the cooling effect to 13.25 °C. A comparison of the temperature fields showed that the TLCC could effectively change the internal temperature field compared with the uncoated sample, for example, by reducing the maximum temperature inside, whose corresponding position was also deeper. As the depth increased, the cooling effect of the TLCC first increased and then decreased slowly. The results emphasize the importance of considering the effect of the coating structure on the cooling performance. This study provides a reference for effectively alleviating high-temperature distresses on asphalt pavement, which is conducive to the sustainable development of pavements.

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Mao, Qian Jin, Qiu Rui Lv, Shun Jie Sun, Su Ping Cui, and Zi Ming Wang. "Energy Savings Potential of Heat Reflective Coatings for Residential and Commercial Buildings in Beijing." Advanced Materials Research 1033-1034 (October 2014): 1194–99. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.1194.

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Analyzed and calculated the energy savings of heat reflective coatings applied on multi-storied residential buildings and high-risen commercial buildings in Beijing. Some advices about the application of heat reflective coatings in northern cold region are given. Energy saving effect was evaluated with the building energy simulation in winter and summer while the heat reflective coating is applied on the surface of residential buildings and commercial buildings. Calculating results showed that the energy saving is the most optimal to the multi-storied buildings when the cool roof coatings is coated on the roofs and the glass heat reflective coating is applied on east and west windows. With the high-risen commercial building, the energy saving is noticeable when the glass curtain wall is coated with glass heat reflective coatings. The energy saving rate can reach a maximum of 13%.

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Wang, Zheng, Yugang Xie, Minghao Mu, Lichao Feng, Ning Xie, and Na Cui. "Materials to Mitigate the Urban Heat Island Effect for Cool Pavement: A Brief Review." Buildings 12, no. 8 (August 12, 2022): 1221. http://dx.doi.org/10.3390/buildings12081221.

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The urban heat island (UHI) effect has a significantly negative impact on the living environment in urban areas. Asphalt pavement is one of the most widely used infrastructures that absorbs solar energy, which leads to the UHI effect and premature failure. As a result, cool pavement technology has been rapidly developed in recent years to mitigate the UHI effect originating from asphalt pavement. Although several outstanding review articles have analyzed previous studies on cool pavement technologies, very few review articles have focused on how to design and expand cool pavement technology from a materials perspective. In this mini-review article, the theoretical and practical factors of the solar reflective coatings and phase-change materials, which are significantly dependent on the design of new materials, have been summarized. The main challenges and potential problem-solving ideas have been presented. In a cool pavement, the solar reflective coatings are composed of epoxy resin or acrylic polymer matrix filled with solar reflective nanoparticles, such as TiO2, SiO2, ZnO, Al2O3, or Fe2O3. The main challenges of the solar reflective coatings are the spalling of the coating polymers from the asphalt pavement surface and the dispersion of the solar reflective nanoparticle in the polymer matrix. Most importantly, it is critical to harmonize the balance between the bonding strength, aging rate, solar reflectance, curing requirements, mechanical properties, and durability of the solar reflective coating. For the nanofillers, the cost of the filler materials, the balance between UV, visible light, and near-infrared reflectance and the dispersion status of the nanofillers in the polymer matrix are the primary factors that must be concerned. For the phase-change materials (PCMs), the interaction between the asphalt and the PCMs, the decomposition of the PCMs, the toxicity of the PCMs, the distribution status of the PCMs in the asphalt matrix, and the cost are the main factors that have to be considered in constructions. This review article can not only provide basic knowledge for the development of new solar reflective pavement materials but also serve as a guide for practical applications of cool pavement in the field.

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Lu, Yang, Md Asif Rahman, Nicholas W. Moore, and Aidin J. Golrokh. "Lab-Controlled Experimental Evaluation of Heat-Reflective Coatings by Increasing Surface Albedo for Cool Pavements in Urban Areas." Coatings 12, no. 1 (December 22, 2021): 7. http://dx.doi.org/10.3390/coatings12010007.

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Many studies were conducted to find possible strategies for reducing the urban heat island (UHI) effect during the hot summer months. One of the largest contributors to UHI is the role that paved surfaces play in the warming of urban areas. Solar-reflective cool pavements stay cooler in the sun than traditional pavements. Pavement reflectance can be enhanced by using a reflective surface coating. The use of heat-reflective coatings to combat the effects of pavements on UHI was pre-viously studied but no consistent conclusions were drawn. To find a conclusive solution, this work focuses on the abilities of heat-reflective pavement coatings to reduce UHI in varying weather conditions. Within this context, both concrete and asphalt samples were subject to a series of per-formance tests when applied to a heat-reflective coating, under the influence of normal, windy, and humid conditions. During these tests, the samples were heated with a halogen lamp and the surface temperature profile was measured using an infrared thermal camera. The air temperature was recorded with a thermometer, and the body temperature at multiple depths of the samples was measured using thermocouples. The results from these tests show that the effectiveness of the heat-reflective coating varies under different weather conditions. For instance, the coated samples were about 1 °C cooler for concrete and nearly 5 °C cooler for asphalt, on average. However, this temperature difference was reduced significantly under windy conditions. As such, the findings from this work conclude that the heat-reflective coatings can effectively cool down the pavement by increasing the surface albedo, and thus might be a viable solution to mitigate UHI impacts in the city/urban areas.

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Marcon, Leonardo, Antonella Chiuchiolo, Bernardo Castaldo, Hugues Bajas, Andrea Galtarossa, Marta Bajko, and Luca Palmieri. "The Characterization of Optical Fibers for Distributed Cryogenic Temperature Monitoring." Sensors 22, no. 11 (May 25, 2022): 4009. http://dx.doi.org/10.3390/s22114009.

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Thanks to their characteristics, optical fiber sensors are an ideal solution for sensing applications at cryogenic temperatures, such as the monitoring of superconducting devices. Their applicability at such temperatures, however, is not immediate as optical fibers exhibit a non-linear thermal response which becomes rapidly negligible below 50 K. A thorough analysis of such a response down to cryogenic temperatures then becomes necessary to correctly translate the optical interrogation readings into the actual fiber temperature. Moreover, to increase the fiber sensitivity down to a few kelvin, special coatings can be used. In this manuscript we described the thermal responses experimental characterization of four commercially available optical fiber samples with different polymeric coatings in the temperature range from 5 K to 300 K: two with acrylate coatings of different thickness, one with a polyimide coating and one with a polyether–ether–ketone (PEEK) coating. Multiple thermal cycles were performed consecutively to guarantee the quality of the results and a proper estimate of the sensitivity of the various samples. Finally, we experimentally validated the quality of the measured thermal responses by monitoring the cool down of a dummy superconducting link from room temperature to approximately 50 K using two fibers coated, respectively, in acrylate and PEEK. The temperatures measured with the fibers agreed and matched those obtained by standard electronic sensors, providing, at the same time, further insight in to the cool-down evolution along the cryostat.

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Більше джерел

Дисертації з теми "Cool coating"

Sjödin, Isak. "Cool Roof Coatings on Industrial Buildings : An Energy Study of Reflective Coatings." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-157503.

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To evaluate the effect of cool roof coatings containing Expancel® thermoplastic microspheres on industrial buildings, a warehouse was built-up in the computer simulation software IDA-ICE. The warehouse was modelled in line with ASHRAE 90.1. 2004 ”Energy Standard for Buildings Except Low-Rise Residential Buildings”. Four different cases were set up where the coating of the roof was the only variable. Two coatings containing Expancel® microspheres - one white and one red coating were compared to the same white coating without Expancel® microspheres and the ”base case” where there is no coating at all. The same circumstances were also implemented in a practical laboratory test using a model warehouse with a detachable roof. Four interchangeable roofs with different roof coatings constitute the various cases in the laboratory tests. A ”sun” consisting of statically mounted IR light bulbs were constructed, as well as a cooling system to measure the difference in cooling effect (maintaining a constant indoor temperature) between the different cases as a result of the change in insolation. The results of the computational simulations show that for a warehouse placed in Houston, Texas about 50 MWh in combined heating and cooling energy can be saved yearly between the best and the worst case, a reduction of 6.2%. Changing the geographic placement of the warehouse to Tepic, Mexico the corresponding savings were determined to 83 MWh or 13.5%. A way of determining the yearly savings in heating and cooling amount for the warehouse with a generic roof coating, only knowing the SRI value of the coating, was developed. It was determined that for every unit-increment of the SRI value the yearly savings for the warehouse placed in Houston, Texas were 718 kWh and 0.1%. The corresponding savings for the warehouse placed in Tepic, Mexico were determined to be 1252 kWh and 0.22%. The laboratory tests showed that the indoor temperature of the model warehouse decreased by close to 16°C between the best and the worst case.

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Rosati, Andrea. "Smart coatings for energy saving buildings." Doctoral thesis, Università degli studi di Trento, 2022. https://hdl.handle.net/11572/355462.

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The present thesis is devoted to synthesis, through the environmentally friendly citrate sol-gel route, of YIn0.9O3 −ZnO near infrared reflective based pigments, having different chromophore elements (Mn, Cu, Fe), with the aim to add in binder and obtaining cool coatings. A “cool” coating for roofing consists of paint (or glaze) containing color pigments, which do not absorb the infrared portion of the solar spectrum. Cool coatings applied over buildings surface provide an effective solution for passive cooling of building indoors and influencing local outdoor microclimate, mitigating urban heat islands effect (UHIE). The primary purpose is to produce pigments according to an environmentally friendly route, using non-toxic raw materials, as well as short times and low temperatures for synthesis, and without residual waste. The resulting pigments must have high reflectance in the near-infrared so that they can be used in the field of cold paints. To realize the corresponding coatings, pigments were dispersed in two different binders (standard PMMA and industrial binder). For the most interesting pigments, in terms of NIR reflectance, other property, was decided to explore, which define these NIR reflective pigments as smart pigments for building application: the photocatalytic ability.

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Szczurek, Eddy. "New approach to the analysis of ribbing in coil coating." Valenciennes, 2007. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/77201d13-7d32-45e8-9211-ec08a6b6c52e.

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The deformable roll coating is used in the coil coating industry. The aim is to apply a liquid film on a moving substrate. During application a defect appears. This defect is called “ribbing” and is characterized by periodic ribs parallel to the moving direction of the substrate. The wet thickness applied on the strip is adjusted by different gaps between rolls. The applied speeds and loads on the rolls modify the film thickness and film stability. The elastomeric roll cover is used to permit thinner film application and to delay the onset of ribbing. In this work, the flow in a deformable contact is presented for a negative gap mode. The aim of the study is an optimisation of the application in real industrial conditions by a good mastering of the contact parameters at the strip / roll cover interface. Compared to previous published studies, the presented work will take into account the elastomer cover behaviour used in industrial environments. A specific cyclic compression test is developed to analyse the elastomer behaviour as a function of representative solicitation and chemical environment. A modification of the Young Modulus and relaxation time of the elastomer is observed for different environments. A Prony series is identified with this test results and will be used in the numerical modelling. The finite element simulation of the process is proposed through a solid-fluid interaction. The solid part of the model predicts the mechanical pressure and the fluid part gets the associated wet thickness and free surface position. Moreover, an experimental investigation is performed to correlate the numerical result and the industrial process
L’enduction par rouleaux déformables est utilisée pour appliquer une épaisseur de liquide sur une bande en mouvement. Pendant l’application un défaut nommé “cordage” apparaît et se caractérise par des rides de peinture. L’épaisseur humide appliquée sur la bande est réglée par différents passages entre les rouleaux. L’épaisseur finale et la stabilité de l’application sont modifiées par les vitesses de rouleaux et les efforts de serrages. Le revêtement d’élastomère est utilisé pour appliquer des films plus minces et limiter le cordage. Dans cette étude, l’écoulement dans un contact déformable est présenté. Le but de ce travail est l’optimisation de l’application pour des conditions industrielles par la maîtrise des paramètres de contact à l’interface bande / rouleau. L’originalité de cette étude est la prise en compte des revêtements d’élastomère et de l’environnement industriel. Un test spécifique de compression est développé pour analyser le comportement de l’élastomère face aux sollicitations industrielles. Des modifications du module d’Young et du temps de relaxation sont observées en fonction de l’environnement. A partir de ces résultats des séries de Prony sont identifiées et seront utilisées pour modéliser le comportement viscoélastique de l’élastomère dans la simulation. Une modélisation éléments finis du procédé est réalisée via une architecture de simulation solide-fluide. La première simulation permet d’évaluer la pression dans le contact et la seconde permet d’obtenir l’épaisseur humide et la position de la surface libre. De plus, une étude expérimentale sur une tête d’enduction est réalisée pour corréler les résultats numériques et le procédé industriel

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Adhami, Siavash. "The development of water-based primers for coil coating applications." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813181/.

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In the search for improvements in the environmental credentials of the organic coatings industry, several different aspects are currently being addressed, including the reduction of volatile organic compounds, development of UV curable coatings and the reduction of potentially hazardous components in the coatings formulations. The aim of this work was to develop the water based primers for coil coating applications as a substitution for chromate conversion coatings. The performance and durability of three novel water based systems applied on alkali cleaned HDGS has been investigated; XPS and ToF-SIMS have been employed to analyse the failure interfaces generated by various test methods designed to assess the performance and durability of each of the systems. In depth analysis has been carried out using ULAM for sample preparation, and XPS and ToF-SIMS were employed to analyse the buried metal/ primer interface, in order to investigate the interface chemistry. A method of post processing data, obtained by surface analysis techniques, was invented to gain a clear understanding of the possible chemical interactions occurred at the metal/primer interface. Adsorption studies were also carried out to encode the interfacial chemistry. The method was used to understand the role of adhesion promoter in the primer formulation, particularly the manner in which it interacts with the substrate and the topcoat and the way it improves the performance and durability; also to determine the role of anti-corrosive additives, especially the manner in which it prevents the corrosion and therefore its contribution toward the performance and durability. The distribution of these components across the primer layer was also investigated considering the possible opportunities of such components enhancing the primer interaction at either interfaces. The finding has been used for re-adjustment of some of process parameters in coil coating systems and specifically water based primers.

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Foster, Gary Marc. "Mechanical properties of coil coatings under controlled humidity." Thesis, University of Exeter, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.559098.

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This thesis deals with the determination of the effect of controlled relative humidity (RH) on the mechanical properties of coil coatings. The coil coatings studied were based on polyester/melamine technology. The study employed mechanical and dynamic mechanical analysis, using modified environmental chambers, to measure the effects of controlled RH on a range of mechanical parameters. Of particular interest was the effect of controlled RH on the minimum forming temperature of the coil coated metallic panels. This is the temperature below which the coating would fracture. A description has been given of the modifications made to both a mechanical tester and a Dynamic Mechanical Analyser (DMA), which allowed controlled RH experiments to be performed under isothermal or thermal scanning conditions. Comparison of this study with published work showed that some experimental data in the literature could be erroneous due to lack of, or inappropriate, RH conditioning prior to testing. The results showed a good correlation for both free film and coated metal samples between the glass transition temperature (Tg) and the brittle-tough transition (Tbt). A reduction of both the Tg and the Tbt of up to 15°C were found as the controlled RH was increased. A controlled RH and environmentally instrumented slow-draw cupping device was constructed to measure the behaviour of coil coatings on aluminium (Al) and hot dip galvanised steel (HDG-steel) substrates. The importance of indentation depth during the cupping test and the difference between the substrates was emphasised. Fracture mechanics was employed to study differences in performance.

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Gowenlock, Cathren. "Near infrared curing of high performance coil coatings." Thesis, Swansea University, 2014. https://cronfa.swan.ac.uk/Record/cronfa42537.

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This thesis has investigated Near Infrared (NIR) curing, a fast thermal curing technique for polyester coil coatings used in exterior building applications where fast line speeds are required. The aim has been to further understanding of the NIR cure mechanism. UV/Vis/NIR spectroscopy and curing trials with two types of AdPhos NIR ovens were used to assess the influence of NIR absorbing pigment locus on cure. Firstly, carbon black was removed from red and brown coatings and this resulted in a wider cure window, but re-siting this pigment in the primer layer was unable to maintain coating colour due to top coat opacity. Then the addition of 1 wt.% NIR absorbing pigment to the backing coat was shown to increase top coat PMT by ca. 46°C, thus enabling line speed or oven power settings to be reduced. The convection cure of white coatings with carbon black primers was investigated and a 5 wt.% loading was able to reduce top coat cure time by ca. 3s. In-situ scanning Kelvin probe (SKP) studies showed that rates of coating delamination by cathodic disbondment remained unchanged for primer carbon black loadings of up to 3.5 wt.%. Silver coatings are particularly difficult to cure by NIR, so glass and mica coated flake were investigated as alternatives to aluminium flake, but resulted in coatings with hiding powers reduced by more than 75%. Further formulation suggestions for silver coatings were made, and emissivity and pigment morphology were suggested as potential factors in cure. Finally, NIR pigment additions of up to 10 wt.% to transpired solar collector (TSC) coatings were investigated, and were found to have a much smaller influence on TSC steady state surface temperature than reducing wind speed. An outdoor study of TSC temperature profile revealed that this closely mirrored the incident solar irradiation profile.

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Sarma, Sreedhara. "Fluid Mechanics of High Speed Deformable Roll coating. An experimental and theoretical study of film thickness and stability in high speed deformable roll coating flow with Newtonian and non-Newtonian liquids." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14842.

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Zhang, Ying. "A spectroscopic study of the degradation of polyurethane coil coatings." Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/3145.

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The degradation of polyurethane (PU) coil coatings were studied with step scan phase modulation photo-acoustic (SS-PM-PA) FTIR, confocal Raman mapping (CRM) and scanning electron microscopy (SEM). PU coatings were oven cured for 30 seconds to reach a peak metal temperature of 232°C. The cured coatings were exposed in a QUV A accelerated ageing test with exposure time intervals of 1200 hours and 4098 hours. Isophorone diisocyanate (IPDI) cross-linker gave lower cross-linking density and degradation rate to the PU coating compared to hexamethylene diisocyanate (HDI). Cyclic trimer (CT) isocyanate cross-linker gave higher durability compared to biuret (BI). A primary amide and urea entity rich top-film was formed at the surface of degraded PU coatings, with characteristic IR bands at 1640 cm-1 and 1560 cm-1. The decomposition of allophanate in exposed HDI-CT cross-linked PU coating was indicated. The degradation of BI core produced additional urea linkage compared to allophanate. ɛ-caprolactam (Capro) blocked isocyanate gave lower cross-linking density and higher degradation rate compared to methyl ethyl ketoxime (MEKO), and 3,5 dimethyl pyrazole (DMP). The addition of melamine and HALS (less than 5%) improved the durability of PU coatings. The melamine linkage was more sensitive to the degradation compared to the urethane linkage. The higher NCO/OH resulted in more rapid degradation product build-up at the surface of the PU coating in the meantime deterred the decomposition of amide II type linkage. A FTIR peak fitting method was developed for generating degradation index plots, based on the knowledge of degradation chemistry of the PU coatings described above. The degradation rate correlation of the PU coatings exposed in the QUV A test and natural exposure sites including Liverpool, UK (LIV), Vereeniging, South Africa (SA) and Kuala Lumpur, Malaysia (KL) are demonstrated by using degradation index plot methods. The harshness of the natural exposure sites gives the order of KL > SA > LIV.

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Powers, Catherine N. "A process for evaluating the benefits of near-infrared reflective roof coatings used on asphalt shingle roofs." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54478.

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Reflective roof coatings keep the roof cooler by minimizing solar absorption and maximizing thermal emission. Keeping the surface of the roof cooler allows less heat to be conducted into the interior of the building which reduces the cooling load in air-conditioned buildings and improve comfort conditions in non-air conditioned buildings. A number of cool white materials, compatible with most roofing products, are available on the market. To appeal to homeowners, special cool “color” products have been developed to match the dark colors of conventional residential roofs but are highly reflective in the invisible near-infrared (NIR) spectrum. Although many studies highlight the benefits of cool white coatings on roof membranes of low-slope roofs, knowledge of NIR reflective coatings on asphalt shingles of steep slope roofs remains limited. The intent of this exploratory study is to present a process that can be used to evaluate the perceived and actual benefits of NIR coatings field-applied to asphalt shingles on single-family houses. The proposed process can be applied to a large sample of homes and occupants in a future study. A questionnaire was designed to attempt to evaluate occupants’ perceived benefits in regards to their indoor environment and occupant satisfaction following applications of NIR coatings. Along with subjective data collection, a field-experiment was developed to objectively compare the thermal performance of an NIR reflective field-coated asphalt shingle roof system with that of a conventional asphalt shingle roof system. Questionnaire results indicated that occupants did not perceive any significant changes to their indoor environment but were satisfied overall with the application and appearance of the roof coating. Additionally, 50% of occupants stated that their monthly energy costs somewhat decreased after the application. Interestingly, 63% of respondents experienced some form of roof leak following the coating application. Among those who experienced roof leaks, 100% of the roofs were 10 years or older. Field results showed that the coated roof surface was 2 to 5℉ cooler than the uncoated roof surface at midafternoon. Statistical testing for correlation between coated roof surface temperature and external conditions revealed that relative humidity was negatively correlated with coated roof temperature, while solar altitude angle was positively correlated with coated roof temperature. Multiple linear regression analysis was used to develop a model for predicting the surface temperature of the coated asphalt shingle roofs from the ambient temperature, sky conditions, dew point temperature, relative humidity, solar altitude and azimuth angle.

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Heinrich, Lydia Alexandra. "Biosourced Coating Systems for Metallic Substrates." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1004.

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Le remplacement de monomères d'origine pétrosourcée par des analogues biosourcés améliore la durabilité et diminue la dépendance aux ressources fossiles. De plus, de nouvelles caractéristiques et propriétés sont souvent découvertes. Les polyesters aliphatiques biosourcés ont déjà partiellement remplacé les produits traditionnels. Dans le contexte du projet Sorago, une résine entièrement biosourcée pour les revêtements de prélaquage des produits intérieurs a déjà été introduite sur le marché (Estetic® bio Air, Arcelor Mittal). Pour permettre l'utilisation du produit dans des applications extérieures, sa résistance à la lumière UV et à l'humidité sont à améliorer. Cela pose deux problèmes : Une disponibilité limitée de monomères pouvant introduire de la rigidité dans la résine et la relation entre la structure de la résine et sa dégradation. La vanilline a été choisie comme synthon pour la gamme des monomères rigides et biosourcées. La transformation de sa fonction aldehyde par réaction de Perkin et sa réactivité a été examinée. Dans une série des copolymerisations, l'influence des conditions de réaction sur la composition du produit final a été proposée. Une relation structure-propriétés concernant la température de la transition vitreuse et la viscoélasticité des plusieurs monomères biosourcées a été établie, et comparée avec celle des monomères petrosourcées. Une série des prototypes avec des propriétés très variées a été soumise à un test de vieillissement rapide. Leur dégradation a été suivie sur la base de leur rétention de brillance, par FTIR et par des tests de µ-dureté et d'épaisseur des films. La performance des prototypes biosourcés s'est révélée inférieure à celle d'une résine standard pétrosourcée mais aucune évidence qui suggère que cela est du à la présence des monomères biosourcées n'a été détectée. Cela suggère que la création d'une résine biosourcée et suffisamment durable pour l'extérieur sera possible
Moving away from petroleum and towards biobased materials not only leads to greater sustainability and lower dependence on diminishing fossil resources, but can also catalyse the discovery of new properties. Aliphatic polyesters based on renewable resources have already started to replace traditional products. Within the Sorago project, a fully biobased resin for interior coil coatings has recently been proposed on the market (Estetic® Bio Air, Arcelor Mittal). In order to extend the possible use of the biobased product to exterior applications, an improvement of its resistance to humidity and UV radiation is crucial. This presents two challenges: The limited availability of monomers which provide rigidity in the resin structure and the relationship between the resin composition and its weatherability. Vanillin was chosen as a possible extension to the range of rigid, biobased monomers for polyesterification reactions. The transformation of its aldehyde and its reactivity was studied in terms of catalytic activation and through a series of copolymerisations which revealed the influence of the reaction conditions on the composition of the product. A structure-property relationship concerning the coating glass transition temperature and visco-elastic behaviour of the coating was furthermore established for a series of renewable monomers and contrasted with petroleum based equivalents. Series of prototypes with a wide variety of properties were then subjected to accelerated weathering tests. Their degradation was followed directly by gloss retention and different mechanisms were revealed using FTIR, µ-hardness and film thickness measurements. While the performance of the biobased coating was subpar, no evidence linking its degradation to the presence of renewable monomers was found, suggesting that the creation of a sufficiently durable and renewable exterior coating will be possible

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Книги з теми "Cool coating"

Meuthen, Bernd, and Almuth-Sigrun Jandel. Coil Coating. Wiesbaden: Vieweg+Teubner Verlag, 2005. http://dx.doi.org/10.1007/978-3-322-99537-7.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. Coil Coating. Wiesbaden: Springer Fachmedien Wiesbaden, 2013. http://dx.doi.org/10.1007/978-3-8348-2354-0.

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Gaske, Joseph E. Coil coatings. Philadelphia, PA, USA (1315 Walnut St., Philadelphia 19107): Federation of Societies for Coatings Technology, 1987.

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Great Britain. Department of the Environment. Secretary of State's guidance - coil coating processes. London: H.M.S.O., 1991.

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Jandel, Almuth-Sigrun. Coil Coating: Bandbeschichtung: Verfahren, Produkte und Märkte. 3rd ed. Wiesbaden: Springer Vieweg, 2013.

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Meuthen, Bernd. Coil coating: Bandbeschichtung: Verfahren, Produkte und Ma rkte ; mit 43 Tabellen. 2nd ed. Wiesbaden: Vieweg, 2008.

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National Association of Corrosion Engineers., ed. Coal tar epoxy coatings: A state-of-the-art publication. Houston, Texas: National Association of Corrosion Engineers, 1991.

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National Association of Corrosion Engineers. Coal tar epoxy coatings: A state-of-the-art publication. Houston: NACE, 1991.

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National Association of Corrosion Engineers., ed. Field-applied coal tar enamel pipe coating systems: Application performance and quality control. Houston: NACE, 2002.

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United States. Environmental Protection Agency. Emission Standards Division., ed. National emission standards for hazardous air pollutants: Metal coil surface coating : background information for promulgated standards. Research Triangle Park, N.C: U.S. Environmental Protection Agency, Office of Air and Radiation, Office of Air Quality Planning and Standards, Emission Standards Division, 2002.

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Частини книг з теми "Cool coating"

Jandel, Almuth-Sigrun, and Bernd Meuthen. "Die Bandbeschichtung." In Coil Coating, 1–8. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_1.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Anhang." In Coil Coating, 309–48. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_10.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Märkte und Produktprofile." In Coil Coating, 9–48. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_2.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Substrate und Beschichtungen." In Coil Coating, 49–120. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_3.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Der Beschichtungsprozess." In Coil Coating, 121–84. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_4.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Qualitätssicherung." In Coil Coating, 185–220. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_5.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Weiterverarbeitung." In Coil Coating, 221–56. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_6.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Umweltschutz und Arbeitssicherheit." In Coil Coating, 257–82. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_7.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Die Coil-Coating-Industrie und ihre Fachverbände." In Coil Coating, 283–98. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_8.

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Jandel, Almuth-Sigrun, and Bernd Meuthen. "Ausblick und Trends." In Coil Coating, 299–308. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2354-0_9.

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Тези доповідей конференцій з теми "Cool coating"

Zingre, Kishor T., and Man Pun Wan. "An Investigation of Heat Transfer Characteristics of Cool Coating for Building Roofs in the Tropical Climate." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63999.

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Heat transfer characteristics of cool coating for building roofs in the tropical climate have been investigated by formulating a cool roof heat transfer (CRHT) model for transient heat flux through a cool-coated multi-layered roof (MLR). Furthermore, the impact of the cool coating on heat flux through roof was quantified by extending the CRHT model to estimate the equivalent thickness of uncoated roof required and the equivalent thermal insulation material thickness to be added over uncoated roof to achieve the same daily heat gain as for a cool-coated roof. It was observed that the impact of cool coating is much more significant for low R-value (5–15 cm2-K/W) roof materials, such as metal roofs, as compared to high R-value (>800 cm2-K/W) roof materials such as concrete, asphalt shingle, wood shingle, etc.

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Fauchais, P., A. M. Vardelle, M. Vardelle, A. Denoirjean, B. Pateyron, and M. El Ganaoui. "Formation and Layering of Alumina Splats: Thermal History of Coating Formation, Resulting Residual Stresses, and Coating Microstructure." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0865.

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Abstract As underlined in 1981 by Mc Pherson, thermo-mechanical properties of plasma-sprayed coatings depend not only on the way particles flatten and resulting splats solidify and cool down, but also on the thermal history of particle layering at the same location. To illustrate what is our present knowledge in that field, plasma-sprayed alumina coatings will be considered through modelings and measurements. The first part of this paper discusses the phenomena linked with particle impact and splat formation: splashing, spreading, solidification and grain growth, angle of impact in conjunction with particle parameters at impact and substrate surface parameters (chemistry, phase structure and roughness, temperature). The second part examines splats layering. It addresses the influence of plasma jet heat flux, relative velocity torch-substrate, powder flow rate and deposition efficiency on splat time-temperature evolution and resulting quenching stress, coating adhesion/cohesion and microstructure. The shadow effect when spraying off normal angle is also discussed. The last part deals with the effect of the successive cooling and reheating of passes on coating properties, and condensation of the vapor issued from evaporating particles.

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Rahmani, Fatemeh, Mark Alan Robinson, and M. R. Barzegaran. "Cool Coating Impacts on Power Efficiency, Energy Performance, and Durability of Solar Modules." In 2022 North American Power Symposium (NAPS). IEEE, 2022. http://dx.doi.org/10.1109/naps56150.2022.10012139.

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Swank, W. D., R. A. Gavalya, J. K. Wright, and R. N. Wright. "Residual Stress Determination from a Laser-Based Curvature Measurement." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0363.

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Abstract Thermally sprayed coating characteristics and mechanical properties are in part a result of the residual stress developed during the fabrication process. The total stress state in a coating/substrate is comprised of the quench stress and the coefficient of thermal expansion (CTE) mismatch stress. The quench stress is developed when molten particles impact the substrate and rapidly cool and solidify. The CTE mismatch stress results from a large difference in the thermal expansion coefficients of the coating and substrate material. It comes into effect when the substrate/coating combination cools from the equilibrated deposit temperature to room temperature. This paper describes a laser-based technique for measuring the curvature of a coated substrate and the analysis required to determine residual stress from curvature measurements. Quench stresses were determined by heating the specimen back to the deposit temperature thus removing the CTE mismatch stress. By subtracting the quench stress from the total residual stress at room temperature, the CTE mismatch stress was estimated. Residual stress measurements for thick (>1mm) spinel coatings with a Ni-Al bond coat on 304 stainless steel substrates were made. It was determined that a significant portion of the residual stress results from the quenching stress of the bond coat and that the spinel coating produces a larger CTE mismatch stress than quench stress.

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Haraldsen, Kristian. "Unique Long Term Simulated Service Testing of Selected Deep Water Wet Insulation Coating Systems." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10630.

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The oil and gas industry is moving to deeper water developments and thermal insulation of pipelines at 2–3000 meter water depths is required. Wet thermal insulation systems are exposed directly to the seawater and large hydrostatic water pressure in combination with high fluid temperatures challenge the integrity of the insulation systems. The thermal insulation properties of the insulation system can be gradually decreased by thermal and physical strains and challenge the flow assurance if not taken into account in the design. Wet thermal insulation systems have traditionally been qualified for long term use by a combination of long-term small scale aging tests and shorter term full scale simulated service tests (typically 7–28 days). To evaluate the long performance, simulated service tests have been run for one full year at high water pressure and internal pipe temperatures. A selection of commercially available wet insulation systems have been tested together with system specific field joint coatings under the maximum internal pipe temperature specified for the individual coating systems. The test has been run in natural seawater at 300 barg pressure and temperature of 2–4 °C. The coating thicknesses have been selected to give U-values of 3–4 W/(m2K). Before the simulated service testing all test pipes were run through a simulated reel installation to impose realistic strains on the coating systems before testing. All tested coatings performed according to expectations during the simulated service test. The syntactic systems (PP and PU based) gave gradual decrease in thermal insulation efficiency with time but the reduction was close to linear and can be accounted for in the design. The coating systems based on solid polymer materials did not show the same reduction of thermal insulation properties with time. Tests of natural cool-down performance of the insulated test pipes showed that the cool down times were maintained during the one year simulated service tests. Post-test investigations of the insulation materials did not reveal significant degradation of the materials as result of the tests but coating systems application related defects were identified which had developed over the test period. None of the pre-existing defects developed to such an extent as to affect the overall U-value of the coating system.

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Zingre, Kishor T., Xingguo Yang, and Man Pun Wan. "An Investigation of Microclimatic Impact of Cool Coating for Buildings in Low-Latitude and Tropical Climate." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39739.

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This study investigates the impact of cool coating on air-conditioning energy savings and micro-climate of buildings in low-latitude and tropical climate by performing a computational study. The computational study was carried out using Integrated Environmental Solutions (IES) software which is plugged in with Computational Fluid Dynamics (CFD) program [1]. IES simulations (which uses the heat balance equations at building envelope surfaces and in indoor environment) were performed to investigate the roof surface temperature, while CFD simulations (which uses the Finite Volume Method) were performed to investigate the impact on micro-climate above a real-size single storey air-conditioned building. The computational models in the software were validated by comparing the simulations results against the experimental results obtained from the test building in the industrial area of Nanyang Technological University (NTU), Singapore. Results showed that by applying a cool coating having solar reflectivity of 0.8 on the concrete roof with original solar reflectivity of 0.27, the surface temperatures of roof and ceiling can be reduced by up to 17.5°C and 1.2°C respectively in an air-conditioned room maintain at 22°C. In addition, after applying this high solar reflectance coating, a maximum reduction of 1.0°C, 0.7°C and 0.6°C for air temperature at a height of 0.5 m, 1 m and 1.5 m above the roof surface could be achieved.

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Ashrafizadeh, H., P. Mertiny, and A. McDonald. "Evaluation of the Influence of Flame Spraying Parameters on Microstructure and Electrical Conductivity of Al-12Si Coatings Deposited on Polyurethane Substrates." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0370.

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Abstract The influence of flame spraying parameters on coating microstructure and electrical conductivity of aluminum- 12silicon coatings deposited on polyurethane substrates was studied. In order to evaluate the effect of the spray parameters on temperature distribution and its corresponding effect on coating characteristics, an analytical model based on a Green’s function approach was employed. It was found that the addition of air to the flame decreased the temperature within the substrate. Dynamic mechanical analysis (DMA) of the PU substrate revealed that the PU softened as the temperature increased. Therefore, by increasing the pressure of the air injected into the flame spray torch from 35 kPa to 69 kPa, the particles impacted a stiffer substrate. This led to increased deformation of the particles into splats upon impact, improved interlocking, and the overall coating had lower porosity and lower electrical resistance. The results obtained indicated that coating properties are sensitive to both thermal spraying parameters and temperature distribution within the substrate when depositing on elastomeric materials. The effect of torch stand-off distance on coating properties was also evaluated. It was found that higher air pressure can cool the substrate and, therefore, allow for a decrease of the stand-off distance. As a result of shorter stand-off distances, a coating with lower porosity and electrical resistance was deposited.

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Feist, J. P., P. Y. Sollazzo, C. Pilgrim, and J. R. Nicholls. "Operation of a Burner Rig for Thermal Gradient Cycling of Thermal Barrier Coatings." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26325.

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Thermal barrier coatings (TBC), in combination with sophisticated cooling systems are crucial for the operation of highly efficient gas turbines. New generations of coatings will need to show increased cycling capability as a future energy mix will contain a high proportion of renewable energy which will be subject to rapid changes in supply. This will require gas turbines to be on stand-by to fill shortages in power supply with short notice. Furthermore, higher operating temperatures are sought to improve the efficiency of the engine. It is, therefore, an aim of the industry to find a coating composition or structure which will enable the operation at temperatures greater than 1250°C and with high cycling capability. Test methods are required to meet these new operating conditions to validate new coatings. The maximum temperature limit of commonly used isothermal or cyclic oxidation tests is usually the temperature at which the substrate will start to significantly oxidise. However, there is the technical need to test the ceramic top layer at elevated surface temperatures up to 1500°C while keeping the substrate ‘cool’. Such capability would allow the effects of ceramic sintering, and deposit induced damage to be assessed at the TBC surface. This only can be performed on a complete coating system, when a thermal gradient is established throughout the coating. This paper reviews a burner test facility, designed and built by Sensor Coating Systems Ltd. (SCS), which combines severe and frequent cycling with the exposure of the coating to high surface temperatures and active cooling of the substrate. Further, this test can include thermal shock by active cooling of the surface at the end of each cycle. The paper will consider different operating conditions and will review experiences in building and operating the rig, including results from thermal barrier coating tests on electron beam physical vapour deposition (EBPVD) and atmospheric plasma spray (APS) samples. Further, the rig is capable of testing optical techniques such as pyrometry and thermographic phosphor thermometry for measuring surface temperature in controlled laboratory conditions and example of this will be presented. The paper also will reflect on the ISO 13123:201 standard for this type of test.

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Browning, J. A. "The 5S Thermal Spray Systems." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0387.

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Abstract The "Shock Stabilized Supersonic Spray System" is currently designed for operation at oxygen supply pressures of 250 psig or 500 psig. It sprays both powder and wire. Low heat losses result in flame-jet temperatures appreciably higher than for chamber type geometries. Increased spray rates and deposit efficiencies result. Simultaneous powder and wire spraying can lead to zero coating stress allowing unlimited thickness build-up. Post flame quenching during wire spraying reduces liquid droplet temperatures nearly eliminating "splashing", while keeping the substrate cool.

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Lin, Kaixin, Tong Zhu, Yihao Zhu, Tsz Chung Ho, Hau Him Lee, Luke Chao, and Chi Yan Tso. "A Dual-Layer Coating Using Nanoparticle-Polymer Hybrid Materials for Daytime Passive Radiative Cooling." In ASME 2022 Power Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/power2022-82380.

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Abstract Radiative cooling takes advantage of cold outer space as an ultimate heat sink to cool objects by spontaneously radiative heat loss in the mid-infrared wavelength range where the atmosphere is highly transparent. This renewable cooling strategy is considered as a sustainable alternative to save energy and reduce the adverse effect on the environment caused by traditional air-conditioning systems. However, it is still challenging to achieve a 24-hour continuous cooling which requires materials for broadband reflection in the solar spectrum from ultraviolet to near-infrared to reduce heat absorption from the sun during daytime operation. Recently, daytime passive radiative cooling has been achieved by designs using dielectric materials, optical structures, metal reflectors, etc. Although effective in optical properties, those designs are costly to fabricate and are difficult for scalable applications. In this work, we present a bi-layer radiative cooling paint (BRCP) using nanoparticle-polymer hybrid materials for daytime passive radiative cooling applications. The bottom layer, doping TiO2 nanoparticles in PDMS polymer, selectively reflects sunlight from the visible to near-infrared range. An Al2O3-nanoparticle-doped PDMS layer is applied atop the bottom layer to enhance ultraviolet reflection. Consequently, the dual-layer coating with optimized thickness and particle concentration attains an overall solar reflection of 92.2% and a mid-infrared emittance (8∼13 μm) of 95.3%. With the promising optical performance, a daytime radiative cooling power of 97.17 W/m2 is theoretically expected under a clear and dry climate. Overall, the dual-layer coating promises an appealing solution for cooling while offering good applicability and scalability in paint format.

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Звіти організацій з теми "Cool coating"

Gaughen, C. D., David E. Pendleton, and Daniel A. Zarate. Zero VOC, Coal Tar Free Splash Zone Coating (SZC). Fort Belvoir, VA: Defense Technical Information Center, December 2010. http://dx.doi.org/10.21236/ada582341.

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Gopala N. Krishnan, Ripudaman Malhotra, Esperanza Alvarez, Kai-Hung Lau, Jordi Perez-Mariano, and Angel Sanjurjo. Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems. Office of Scientific and Technical Information (OSTI), December 2006. http://dx.doi.org/10.2172/901148.

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Gopala N. Krishnan, Ripudaman Malhotra, Esperanza Alvarez, Kai-Hung Lau, Jordi Perez Mariano, and Angel Sanjurjo. Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/895923.

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Gopala N. Krishnan, Ripudaman Malhotra, Esperanza Alvarez, Kai-Hung Lau, and Angel Sanjurjo. Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/877701.

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Gopala N. Krishnan, Ripudaman Malhotra, Esperanza Alvarez, Kai-Hung Lau, and Angel Sanjurjo. Diffusion Coatings for Corrosion Resistant Components in Coal Gasification Systems. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/888654.

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Gopala N. Krishnan, Ripudaman Malhotra, Jordi Perez, Marc Hornbostel, Kai-Hung Lau, and Angel Sanjurjo. Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems. Office of Scientific and Technical Information (OSTI), May 2007. http://dx.doi.org/10.2172/926667.

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