Preparation of thermochromic coatings and their energy saving analysis

Zheng, Sijia; Xu, Yi; Shen, Qing; Ye, Hui

doi:10.1016/j.solener.2014.09.049

Cited by 89 publications

(36 citation statements)

References 34 publications

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“…They also point out the potential savings by using high solar reflective surfaces on the façade especially for high-rise buildings. Zheng et al (2015) used EnergyPlus software to study the influence of thermochromic coatings on energy use. The solar reflectance of the thermochromic coatings increase when they are heated.…”

Section: Optical Properties Of Organic Coated Steel Sheetsmentioning

confidence: 99%

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Joudi¹

2015

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Recent studies have shown that the optical properties of building exterior surfaces are important in terms of energy use and thermal comfort. While the majority of the studies are related to exterior surfaces, the radiation properties of interior surfaces are less thoroughly investigated. Development in the coil-coating industries has now made it possible to allocate different optical properties for both exterior and interior surfaces of steel-clad buildings. The aim of this thesis is to investigate the influence of surface radiation properties with the focus on the thermal emittance of the interior surfaces, the modeling approaches and their consequences in the context of the building energy performance and indoor thermal environment.The study consists of both numerical and experimental investigations. The experimental investigations include parallel field measurements on three similar test cabins with different interior and exterior surface radiation properties in Borlänge, Sweden, and two ice rink arenas with normal and low emissive ceiling in Luleå, Sweden. The numerical methods include comparative simulations by the use of dynamic heat flux models, Building Energy Simulation (BES), Computational Fluid Dynamics (CFD) and a coupled model for BES and CFD. Several parametric studies and thermal performance analyses were carried out in combination with the different numerical methods.The parallel field measurements on the test cabins include the air, surface and radiation temperatures and energy use during passive and active (heating and cooling) measurements. Both measurement and comparative simulation results indicate an improvement in the indoor thermal environment when the interior surfaces have low emittance. In the ice rink arenas, surface and radiation temperature measurements indicate a considerable reduction in the ceiling-to-ice radiation by the use of low emittance surfaces, in agreement with a ceiling-to-ice radiation model using schematic dynamic heat flux calculations.The measurements in the test cabins indicate that the use of low emittance surfaces can increase the vertical indoor air temperature gradients depending on the time of day and outdoor conditions. This is ii in agreement with the transient CFD simulations having the boundary condition assigned on the exterior surfaces. The sensitivity analyses have been performed under different outdoor conditions and surface thermal radiation properties. The spatially resolved simulations indicate an increase in the air and surface temperature gradients by the use of low emittance coatings. This can allow for lower air temperature at the occupied zone during the summer.The combined effect of interior and exterior reflective coatings in terms of energy use has been investigated by the use of building energy simulation for different climates and internal heat loads. The results indicate possible energy savings by the smart choice of optical properties on interior and exterior surfaces of the building.Overall, it is concluded that the interior re...

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Section: Optical Properties Of Organic Coated Steel Sheetsmentioning

confidence: 99%

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Joudi¹

2015

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“…Reversible thermochromic materials exhibit a shift in color when heated and a return to their original colors when cooled down to room temperature. These materials have been applied for solar reflectance in structures to provide a thermally comfortable indoor environment [3][4][5][6][7]. Kamalisarvestani et al [8] proposed a thermochromic window coating that changes its color to block solar radiation.…”

Section: Introductionmentioning

confidence: 99%

MnNH4P2O7-Based Coating for High Temperature Assessment on the Surfaces of Cement Composites

et al. 2020

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This study examines the implementation of an MnNH4P2O7 (ammonium manganese III pyrophosphate)-based coating on structural elements to obtain temperature information with color changes. Based on the MnNH4P2O7 material, a coating was prepared and deposited on cement mortar surfaces. Heat experiments were then conducted to evaluate the thermochromism on the fabricated samples. The coated samples exhibited a superior irreversible thermochromic property at 400 °C with a color change from dark violet to light grayish blue at the heated surface. The color changes were retrieved at each temperature using a digital camera, and the change in color properties was evaluated in the RGB and L*a*b* color spaces using image processing techniques. With increasing temperature from room temperature, the RGB values were almost constant until 200 °C. At higher temperatures, the color changes started to accelerate until 400 °C. The values showed a 167%, 567%, and 49% increase in R, G, and B values, respectively, at 400 °C. In the L*a*b* color space, when the temperature was increased from room temperature to 400 °C, the L*a*b* values showed an increase of 211%, a decrease of 94%, and an increase of 78%, respectively.

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“…As a special coating which can change the color of many materials [1], thermochromic coatings have attracted wide attention of scientists in the fields of surface temperature measurement, chemical anti-counterfeiting, entertainment decoration, and other fields [2,3]. There are many ways to prepare thermochromic coatings, which can be classified as inorganic, organic, and liquid crystal [4].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Glass Fiber Powder on the Properties of Waterborne Coatings with Thermochromic Ink on a Chinese Fir Surface

et al. 2019

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In this study, the effect of glass fiber powder on the properties of waterborne coatings with thermochromic ink was investigated, using Chinese fir board as the base material and temperature-sensitive thermochromic waterborne coatings with thermochromic ink as the paint base. The concentration of glass fiber powder was determined when the microstructure, optical properties, mechanical properties, liquid resistance, and heat preservation effect were the best. The results showed that the paint film with glass fiber powder concentration of 1.0% to 7.0% had better discoloration performance. With an increase of the glass fiber powder concentration, the gloss of the paint film decreased gradually, and when the concentration of glass fiber powder was 0% to 5.0%, the gloss of the paint film was better. The concentration of glass fiber powder had no effect on the adhesion, impact resistance, and liquid resistance. In the first 2.5 min, the temperature value of the waterborne coating with 3.0% glass fiber powder was higher than that without glass fiber powder, which has a certain heat preservation effect. When the glass fiber powder content was 3.0%, the microstructure of paint film was the best. The composition of paint film with different glass fiber powder concentrations was not different and the discoloration performance of paint film with heat preservation effect was not affected by time. The analysis showed that the waterborne coating with 3.0% glass fiber powder had the best comprehensive performance. This work provides a technical reference for the industrialization of heat preservation and thermochromic coating on wood.

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Preparation of thermochromic coatings and their energy saving analysis

Cited by 89 publications

References 34 publications

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

MnNH4P2O7-Based Coating for High Temperature Assessment on the Surfaces of Cement Composites

The Effect of Glass Fiber Powder on the Properties of Waterborne Coatings with Thermochromic Ink on a Chinese Fir Surface

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