Energy saving performance of thermochromic coatings with different colors for buildings

Zhang, Yuxuan; Zhu, Yan; Yang, Jing; Zhai, Xiaoqiang

doi:10.1016/j.enbuild.2020.109920

Cited by 54 publications

(11 citation statements)

References 20 publications

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“…A spectrophotometer (Model CS-5960GX) was used to detect the color change of TCM and PCM samples in reflection mode. Based on CIE L*A*B* color space, the colors were represented by three values L *, a *, and b *, in which L * (brightness, 0–100: black–white), a * (green–red color components, between −128 and +127: green–red) and b * (blue-yellow color components, between −128 and +127: blue–yellow), and the color difference E * between two states was calculated according to the following formula: normalΔ E * = false( L 2 * − L 1 * false) 2 + false( a 2 * − a 1 * false) 2 + false( b 2 * − b 1 * false) 2 where L 1 * , a 1 * , and b 1 * represent the color of SRW-TC or SRW-PC before thermal or light stimulus, and L 2 * , a 2 * , and b 2 * represent the color of SRW-TC or SRW-PC after the stimulus.…”

Section: Experimental Sectionmentioning

confidence: 99%

Programmable and Shape–Color Synchronous Dual-Response Wood with Thermal Stimulus

Tan,

Wang,

Dong

et al. 2024

ACS Nano

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Stimuli-responsive materials exhibit huge potential in sensors, actuators, and electronics; however, their further development for reinforcement, visualization, and biomassincorporation remains challenging. Herein, based on the impregnation of thermochromic microcapsule (TCM)-doped dynamic covalent vitrimers, a programmable shape-color dualresponsive wood (SRW-TC) was demonstrated with robust anisotropic structures and exchangeable covalent adaptable networks. Under mild conditions, the resultant SRW-TC displays feasible shape memorability and programmability, resulting from the rigidity−flexibility shift induced by the glass-transition temperature (34.99 °C) and transesterification reaction triggered by the topology freezing transition temperature (149.62 °C). Furthermore, the obtained SRW-TC possesses satisfactory mechanical performance (tensile strength of 45.70 MPa), thermal insulation (thermal conductivity of 0.27 W/m K), anisotropic light management, and benign optical properties (transmittance of 51.73% and haze of 99.67% at 800 nm). Importantly, the incorporation of compatible TCM enables SRW-TC to visualize shape memory feasibility and rigidity/flexibility switching and respond to the external thermal stimulus through the thermalinduced shape−color synchronous dual-responsiveness, which successfully demonstrates the applications of sensing temperature, grasping objects, encrypting/decoding icon messages, and so on. The proposed facile and highly effective strategy could serve as a guideline for developing high-performance multifunctional wood composite with promising intelligent applications in performance visualization, environmental sensing, materials interactivity, information dualencryption, local precision shape and color regulation, etc.

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Section: Experimental Sectionmentioning

confidence: 99%

Programmable and Shape–Color Synchronous Dual-Response Wood with Thermal Stimulus

Tan,

Wang,

Dong

et al. 2024

ACS Nano

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“…This property has a significant influence on the building energy in the summer and winter seasons. It has been reported that using TCCs can reduce the annual energy consumption and CO2 emissions by 4.28-5.02 kWh/m2 and 3.40-3.98 kg/m2, respectively, compared with the common coatings [69].…”

Section: Figure 5 Principle Of Using Light Colour Coatings To Minimis...mentioning

confidence: 99%

A short review on passive strategies applied to minimise the building cooling loads in hot locations

Al-Yasiri

Szabó

2021

Anal. Tech. Szeged.

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Cooling and air-conditioning systems are responsible for the highest energy consumption in buildings located in hot areas. This high share does not only increase the building energy demand cost but also increases the environmental impact, the topmost awareness of the modern era. The development of traditional systems and reliance on renewable technologies have increased drastically in the last century but still lacks economic concerns. Passive cooling strategies have been introduced as a successful option to mitigate the energy demand and improve energy conservation in buildings. This paper shed light on some passive strategies that could be applied to minimise building cooling loads to encourage the movement towards healthier and more energy-efficient buildings. For this purpose, seven popular passive technologies have been discussed shortly: multi-panned windows, shading devices, insulations, green roofing, phase change materials, reflective coatings, and natural ventilation using the windcatcher technique. The analysis of each strategy has shown that the building energy could be improved remarkably. Furthermore, adopting more passive strategies can significantly enhance the building thermal comfort even under severe weather conditions.

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“…Furthermore, thermochromic pigments can be used in outdoor applications, such as road markings for icy road conditions warnings, or employed in roof coatings to increase the energy efficiency of buildings. [40][41][42][43][44] However, outdoor applications are limited by the poor degradation resistance of thermochromic pigments. 28,30 As a matter of fact, these materials exhibit a severe loss of thermochromic features due to chemicalphysical degradation phenomena following UV-B exposure.…”

Section: Introductionmentioning

confidence: 99%

“…The main applications of these materials reside in industrial machinery and kitchen tools, as well as in design products and home furniture. Furthermore, thermochromic pigments can be used in outdoor applications, such as road markings for icy road conditions warnings, or employed in roof coatings to increase the energy efficiency of buildings 40–44 …”

Section: Introductionmentioning

confidence: 99%

Esthetic performance of thermochromic pigments in cataphoretic and sprayed coatings for outdoor applications

Calovi

Russo

Rossi

2021

J of Applied Polymer Sci

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This study aims to assess the aesthetical performances of thermochromic coatings for outdoor applications. In details, this work focuses on the efficiency of thermochromic pigments inside cataphoretic and sprayed primers, evaluating the possible synergic effect of a protective transparent topcoat. The structure of thermochromic pigments is examined by optical microscope, and their color-changing behavior is evaluated by colourimetric measurements. Colourimetric analyses are also carried out to monitor the thermochromic performances of the coatings during exposure to an aggressive NaCl solution and UV-B radiations, and to assess the protective role of the topcoat. In addition to that, wet-and dry-abrasion tests are carried out to define the suitability of these coatings for outdoor applications where good resistance to mechanical damage is required. Thus, this work evidences the better aesthetical features of the cataphoretic primer, which, however, particularly suffers from chemicalphysical degradation processes. Nevertheless, the application of the transparent topcoat allows to maintain the integrity of the cataphoretic primer. The double-layer coating exhibits a remarkable color-changing behavior even when subjected to degradation phenomena due to exposure to aggressive environments.

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Energy saving performance of thermochromic coatings with different colors for buildings

Cited by 54 publications

References 20 publications

Programmable and Shape–Color Synchronous Dual-Response Wood with Thermal Stimulus

Programmable and Shape–Color Synchronous Dual-Response Wood with Thermal Stimulus

A short review on passive strategies applied to minimise the building cooling loads in hot locations

Esthetic performance of thermochromic pigments in cataphoretic and sprayed coatings for outdoor applications

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