Highly reflective coatings for interior and exterior steel cladding and the energy efficiency of buildings

Joudi, Ali; Svedung, Harald; Bales, Chris; Rönnelid, Mats

doi:10.1016/j.apenergy.2011.06.002

Cited by 41 publications

(17 citation statements)

References 18 publications

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“…As an example of using the facade properties, the reflectance of roofs has been specifically aimed at reducing the cooling energy requirements by minimizing the solar energy gain in the relatively warm and hot regions of the US [8][9][10][11]. Facades with a relatively high reflectance of a room composed of specific components have also been discussed in not only hot and warm regions such as Hong Kong and China but also cold regions such as Sweden [12][13][14][15]. The emphasis on reflectance has been prompted by the development of highly reflective materials [16][17][18][19][20] that are capable of reflecting greater amounts of near infrared (NIR) solar radiation without the need to change the surface color.…”

Section: Introductionmentioning

confidence: 98%

Effect of facade components on energy efficiency in office buildings

2015

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Section: Introductionmentioning

confidence: 98%

Effect of facade components on energy efficiency in office buildings

2015

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“…An experimental study by Joudi et al [14,15] analysed the effect of an interior low emissivity coating (ε = 0.25) that was applied to the indoor surface of a small cabin in Sweden. The indoor temperature and the energy consumption for heating and cooling the building was monitored and then compared to a normal cabin without an interior surface coating.…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of the Effects of Low-Emissivity Paints as Interior Radiation Control Coatings

Fantucci

Serra

2020

Applied Sciences

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Radiation Control Coatings (RCC) are commonly recognised as paints, in which the long-wave radiation emissivity can be dramatically reduced from 0.9 to below 0.25 due to the dispersion of aluminium flakes inside the base paint. The low emissivity (Low-E) feature makes these materials particularly suitable for reducing the radiative heat exchange in building components and worthy of being used in roof attics, pipes, heat storage tank, etc. However, in the last few years, the application to the indoor surfaces of the building envelope has become quite popular, because the reflective properties can be exploited to increase the thermal comfort and reduce the winter heat losses. Except for aluminium based paint, that, for their strong metallized effect, suffer from some aesthetical limitation, the claimed performance of most of the other commercially available reflective paints are not universally recognized and in most of the cases their properties are misled, referring to visible and short wave infrared reflectivity. In this paper, a new methodology for assessing the long-wave thermal emissivity by using a heat flow meter apparatus is proposed. Moreover, the thermal emissivity of different paint mixtures with reduced metallised effect is assessed. The results allow for affirming that paints with acceptable aesthetic value (limited metallized effect) can reach an emissivity of ~0.60 instead of a typical emissivity of paint between 0.85–0.90. Furthermore, the partition wall of a double climatic chamber apparatus was painted with different low-E paints to evaluate whether an increase of the indoor operative temperature would have been observed. A slight, but not negligible, increase was shown of up to 0.3 °C and 0.6 °C for paint with an emissivity of ~0.6 and ~0.4, respectively.

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“…Flake aluminum powders offer high spectral reflectance, good electric conductivity, excellent shielding capacity, and low cost. They are widely used in automobile metallized coatings, energy saving coatings, electromagnetic shielding coatings and infrared stealth coatings [1][2][3][4][5][6]. For the infrared stealth material, high concentrations of flakey aluminum powders can reduce infrared emissivity and restrain infrared radiation, but its high lightness and electrical conductivity challenge optics and radar stealth [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Processing Parameters on the Formation and Properties of Al/Ni Core-Shell Pigments via a Galvanic Displacement Method

et al. 2018

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Al/Ni bimetallic core-shell pigments with flake Al particle as core and metallic Ni as shell were synthesized via a galvanic displacement method and studied with X-ray diffraction, scanning electron micrograph (SEM), specific surface area analysis (BET), thermogravimetry-differential thermalanalysis (TG/DSC), and visible-near infrared-infrared reflectance spectroscopy. The influence of reactant ratio (Al:Ni 2+) and order of addition on phase structure, surface morphology, optical properties, and high temperature oxidation resistance properties were studied systematically. The results show that the local concentration of Ni 2+ at solid-liquid interfaces can be effectively modulated by adjusting the reactant ratio and order of addition. A high local concentration of Ni 2+ improves the rate of displacement reaction resulting in more metallic Ni on the surface of the flake Al powders. This increases the relative content of Ni in the shell. The change of displacement reaction rate also leads to a different surface morphology and roughness of the Ni shell. The thick and rough Ni shell has a strong absorption extinction due to the intense light scattering and absorption-this substantially reduces the spectral reflectance of the flake Al core. Infrared reflectance in particular is influenced by light scattering and absorption of the rough surface. In addition, the Ni shell can enhance the high temperature oxidation resistance of the Al core by preventing contact between the metallic Al substrate and oxygen. The oxidation resistance is also associated with the processing parameters of the galvanic displacement reaction.

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Highly reflective coatings for interior and exterior steel cladding and the energy efficiency of buildings

Cited by 41 publications

References 18 publications

Effect of facade components on energy efficiency in office buildings

Effect of facade components on energy efficiency in office buildings

Experimental Assessment of the Effects of Low-Emissivity Paints as Interior Radiation Control Coatings

The Effect of Processing Parameters on the Formation and Properties of Al/Ni Core-Shell Pigments via a Galvanic Displacement Method

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