Добірка наукової літератури з теми "Variable Emissivity Coatings"

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Статті в журналах з теми "Variable Emissivity Coatings"

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Xia, Ge, and Li Yang. "The Study on Infrared Stealthy of Variable Emissivity Materials Based on the Radiation Contrast." Applied Mechanics and Materials 419 (October 2013): 341–47. http://dx.doi.org/10.4028/www.scientific.net/amm.419.341.

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Анотація:
The infrared stealth coating with changeless emissivity is impossible to implement ships infrared stealth all the time. According to this characteristic, the range of target surface emissivity can be acquired from the calculation and analysis of target and background infrared characteristics with the radiation contrast should be less than 0.04. Using electrochromic materials to change the average emissivity of target surface in 3:5μm and 8:14μm wavelength can mainly meet the target infrared stealth all the time. It has a big improvement in the stealth efficiency compared to the infrared stealth coatings with changeless emissivity.
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Athanasopoulos, N., J. Farmasonis, and NJ Siakavellas. "Preliminary design and comparative study of thermal control in a nanosatellite through smart variable emissivity surfaces." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 9 (August 22, 2018): 3336–50. http://dx.doi.org/10.1177/0954410018795809.

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The thermal radiation that is rejected or absorbed into deep space is highly variable. Ultralight smart surfaces with arrays of unit cells can be designed to change their effective emissivity and absorptivity without energy consumption, actuators, and controllers, and can be used for the temperature control of satellites. The smart surfaces work in a similar manner to thermal louvers but they are hingeless, lighter, and their activation depends on their anisotropic mechanical properties and multilayer structure. The generated thermal stresses between layers that have a high mismatch in the coefficient of thermal expansion cause large deformations and rotations within small temperature changes. The arrays of the surface open or close, and transform their geometry as a function of temperature; therefore, coatings of different thermo-optical properties are revealed or concealed, thus creating variable emissivity surfaces. The emissivity and absorptivity curves of the smart surfaces can be entirely designed as a function of temperature. Theoretically, an emissivity change equal to Δε = 0.8 can be achieved. The small thermal capacitance renders nanosatellites very susceptible to temperature fluctuations. In this study, different emissivity curves were generated to re-calculate the worst cold and hot cases, and to redesign the thermal control system of a certain nanosatellite. We studied a plethora of design cases based on the energy balance equation in steady state while considering the nanosatellite as one-node geometry. In two ideal designs, the temperature deviation of the nanosatellite in the worst cold and hot cases is limited to Δ Τ = 37 ℃ or 43 ℃ without the use of heaters. Moreover, with a power equal to 0.7 W the temperature deviation is limited to Δ Τ = 20 ℃. Consequently, the thermal fatigue is minimized and the energy consumption during the eclipse phase is reduced.
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3

Fan, Desong, Qiang Li, Yimin Xuan, and Ping Dai. "Variable emissivity property of magnetron sputtering thermochromic film." Thin Solid Films 570 (November 2014): 123–28. http://dx.doi.org/10.1016/j.tsf.2014.09.032.

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4

Barone, Giovanni, Annamaria Buonomano, Cesare Forzano, and Adolfo Palombo. "Building Energy Performance Analysis: An Experimental Validation of an In-House Dynamic Simulation Tool through a Real Test Room." Energies 12, no. 21 (October 28, 2019): 4107. http://dx.doi.org/10.3390/en12214107.

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This paper focuses on the experimental validation of a building energy performance simulation tool by means of a comparative analysis between numerical results and measurements obtained on a real test room. The empirical tests were carried out for several months under variable weather conditions and in free-floating indoor temperature regime (switched off HVAC system). Measurements were exploited for validating an in-house simulation tool, implemented in MatLab and called DETECt, developed for dynamically assessing the energy performance of buildings. Results show that simulated indoor air and surface room temperatures resulted in very good agreement with the corresponding experimental data; the detected differences were often lower than 0.5 °C and almost always lower than 1 °C. Very low mean absolute and percentage errors were always achieved. In order to show the capabilities of the developed simulation tool, a suitable case study focused on innovative solar radiation high-reflective coatings, and infrared low-emissivity materials is also presented. The performance of these coatings and materials was investigated through a comparative analysis conducted to evaluate their heating and cooling energy saving potentials. Simulation results, obtained for the real test cell considered as equipped with such innovative coatings and material, show that for the weather zone of Naples a 5% saving is obtained both in summer and in winter by simultaneously adopting a high-reflectance coating and a low- emissivity plaster for roof/external walls and interior walls, respectively.
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5

Lu, Feifei, Peiyu Tan, and Yuge Han. "Variable infrared emissivity based on polyaniline electrochromic device influenced by porous substrate." Journal of Applied Polymer Science 138, no. 1 (July 6, 2020): 49622. http://dx.doi.org/10.1002/app.49622.

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6

Chirov, A. A. "A Method to Measure Absorptivity and Emissivity of Temperature-Controlling Coatings of Spacecraft Using Radiation Flux of Variable Intensity." Cosmic Research 41, no. 6 (November 2003): 584–92. http://dx.doi.org/10.1023/b:cosm.0000007959.05193.ac.

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7

Tian, Yanlong, Xiang Zhang, Shuliang Dou, Leipeng Zhang, Hongming Zhang, Haiming Lv, Lili Wang, Jiupeng Zhao, and Yao Li. "A comprehensive study of electrochromic device with variable infrared emissivity based on polyaniline conducting polymer." Solar Energy Materials and Solar Cells 170 (October 2017): 120–26. http://dx.doi.org/10.1016/j.solmat.2017.05.053.

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8

Lämmle, Manuel, Christoph Thoma, and Michael Hermann. "A PVT Collector Concept with Variable Film Insulation and Low-emissivity Coating." Energy Procedia 91 (June 2016): 72–77. http://dx.doi.org/10.1016/j.egypro.2016.06.174.

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9

Mitchell, M. R., R. E. Link, Lance Turner, Christopher Manning, and Geoffrey Peake. "Effect of Coating Variables on Total Solar Reflectance and Emissivity of Polymer-Coated Metal Panels." Journal of Testing and Evaluation 36, no. 6 (2008): 101899. http://dx.doi.org/10.1520/jte101899.

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10

Vlassov, Valeri V., Dênio Lemos Panissi, and Fabiano Luis de Sousa. "Analysis of Concept Feasibility and Results of Numerical Simulation of a Two-Stage Space Radiator With Variable Emissivity Coating." Heat Transfer Engineering 38, no. 10 (July 14, 2016): 963–74. http://dx.doi.org/10.1080/01457632.2016.1212581.

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Тези доповідей конференцій з теми "Variable Emissivity Coatings"

1

Woolf, David N., Colin M. Hessel, Albert G. Wright, Joel M. Hensley, Chenghao Wan, Yuzhe Xiao, Jonathan King, and Mikhail A. Kats. "Combining Sol-Gel and Evaporative Coating Techniques to Produce High-Solar Reflectivity, High-Contrast Variable Emissivity Coatings using Vanadium Dioxide." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/oic.2022.mc.2.

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Анотація:
We demonstrated a variable-emissivity coating incorporating vanadium dioxide with an integrated hemispherical emissivity that is switchable between values of 0.79 (maximum) and 0.17 (minimum) using sol-gel and evaporative coating techniques.
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2

Wu, Chongzhao, Zhaoyi Li, Derek Schwanz, Zhen Zhang, Shriram Ramanathan, and Nanfang Yu. "Variable Emissivity Coatings Based on Plasmonic Metasurfaces Integrated with Phase-Transition Materials." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/cleo_qels.2017.fm1h.5.

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3

Woolf, David N., Colin M. Hessel, Albert G. Wright, Joel M. Hensley, Chenghao Wan, Yuzhe Xiao, Jonathan King, and Mikhail A. Kats. "High Contrast Variable-Emissivity Coating using Vanadium Dioxide." In CLEO: Science and Innovations. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_si.2022.sf2o.4.

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Анотація:
We demonstrated a variable-emissivity coating incorporating vanadium dioxide with an integrated hemispherical emissivity that is switchable between values of 0.79 (maximum) and 0.17 (minimum) 0.17 that can be used for passive thermal control of spacecraft.
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4

Moulla, L., Z. Salhi, M. P. Planche, M. Cherigui, and C. Coddet. "On the Measurement of Substrate Temperature During Thermal Spraying." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0679.

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Анотація:
Abstract Substrate temperature is nowadays recognized as a key parameter to optimise the coating quality in the thermal spraying process. Generally parts being processed are in motion and therefore non contact temperature measurement devices are appropriate. In contrast to thermocouples, optical pyrometers have several advantages. First, they are easy to install and second they do not bring any disturbance to the measured system. Meanwhile, several problems may arise with those devices which are not always considered as they should be and in particular the variation of material emissivity temperature, the effect of the reflection of the external radiation or the attenuation of the optical signal due to the variable transmissivity of the optical path. The aim of this work was to develop algorithms for correcting optical pyrometer temperature measurements during thermal spraying by taking into account emissivity variations and radiation reflexion on the components. Emissivity of some materials with respect to the specific spectral band of the pyrometer and the influence of reflected radiations were measured. Results are discussed in order to point out the influence of each parameter on the temperature value.
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5

Downer, Juvani, Mehdi Kabir, John Irungu, Calin Tarau, Bao Yang, and Jiajun Xu. "DESIGN AND DEVELOPMENT OF A SMART MUTILAYER COATING WITH VARIABLE EMISSIVITY CAPABILITY FOR SPACECRAFT THERMAL CONTROL SYSTEMS." In 7th Thermal and Fluids Engineering Conference (TFEC). Connecticut: Begellhouse, 2022. http://dx.doi.org/10.1615/tfec2022.aer.041124.

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