A composite cool colored tile for sloped roofs with high ‘equivalent’ solar reflectance

Ferrari, Chiara; Libbra, Antonio; Cernuschi, F.; Maria, Letizia De; Marchionna, Stefano; Barozzi, Matteo; Siligardi, Cristina; Muscio, Alberto

doi:10.1016/j.enbuild.2015.06.062

Cited by 34 publications

(7 citation statements)

References 30 publications

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“…The SRI measurement process requires a minimum of 10 × 10 (ft) of packaging space and uses fairly expensive equipment [43]. Various previous studies have been reported to evaluate the cool roof performance using SRI [18][19][20]44,45]. Measuring SRI on the specific packaging space of the surveyed roof is a traditionally used method.…”

Section: Resultsmentioning

confidence: 99%

Evaluating the Operational Potential of LRV Signatures Derived from UAV Imagery in Performance Evaluation of Cool Roofs

et al. 2019

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It is quite difficult to find studies regarding area-wide data from UAV (Unmanned Aerial Vehicle) remote sensing in evaluating the energy saving performance of a cool roof. Acknowledging these constraints, we investigated whether LRV (Light Reflectance Value) signatures derived from UAV imagery could be used effectively as an indicator of area-wide heating and cooling load that distinctively appears according to rooftop color. The case study provides some quantitative tangible evidence for two distinct colors: A whitish color roof appears near the edge of the highest LRV (91.36) and with a low temperature (rooftop surface temperature: (38.03 °C), while a blackish color roof shows the lowest LRV (18.14) with a very high temperature (65.03 °C) where solar radiation is extensively absorbed. A strong negative association (Pearson correlation coefficient, r = −0.76) was observed between the LRV and surface temperature, implying that a higher LRV (e.g., a white color) plays a decisive role in lowering the surface temperature. This research can be used as a valuable reference introducing LRV in evaluating the thermal performance of rooftop color as rooftops satisfying the requirement of a cool roof (reflecting 75% or more of incoming solar energy) are identified based on area-wide objective evidence from UAV imagery.

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Section: Resultsmentioning

confidence: 99%

Evaluating the Operational Potential of LRV Signatures Derived from UAV Imagery in Performance Evaluation of Cool Roofs

et al. 2019

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“…The substrate material was tested with the application of different ceramic coatings through several studies, and the developed nonwhite coatings enhanced the solar reflective performance and showed interesting results in terms of energy saving [98,99]. Moreover, the wollastonite-hardystonite glass-ceramic porous tiles showed high reflectances of solar radiation, coupled with low thermal conductivity in an arid environment [100], which highlights the complementary function with regard to the thermal insulation properties [101,102]. In the same sense, an improvement in the thermal performance of a residential building was found during the summer and the winter, and 75% of the solar radiation reflectance in the NIR spectrum was registered, i.e., 10% more with respect to traditional tiles, without altering the visible appearance [64].…”

Section: Ceramic Materialsmentioning

confidence: 99%

Cool Surface Strategies with an Emphasis on the Materials Dimension: A Review

et al. 2022

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The need to tackle the urban heat island effect demands the implementation of cool surfaces as a mitigation strategy. This study comprehensively reviews the evolution of this research field from a materials perspective. It provides a bibliometric analysis of the relevant literature using the SciMAT software processing of bibliographic records from 1995 to 2020, for the evolution of cool surfaces. The results obtained show an increased interest in the field from 2011 to 2020, particularly for roof applications, and present the scientific evolution of reflective materials. According to the materials dimension adopted by the development of the research field, the study is refined from a bibliometric analysis of 982 selected records for the analysis of five themes: (i) Pigments; (ii) Phase change materials; (iii) Retroreflective materials; (iv) Ceramic materials; and (v) Glass. These materials present promising results in terms of their solar reflectance performances in the mitigation of the urban heat island phenomenon. At the end of this review, recommendations for future studies are provided for the creation of economic and environmentally friendly materials based on waste glass recycling. This study represents a valuable contribution that provides a scientific background with regard to cool surfaces from a materials perspective for future investigations.

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“…The other big trend is represented by the development of cool tiles suitable for application in historical contexts, typically characterized by ceramic bricks and tiles with relatively low solar reflectance capability, that is, 20-35%. To this aim, researchers (Ferrari et al, 2016;Ferrari, Muscio, Siligardi, & Manfredini, 2015) elaborated that new coatings will be able to resist the traditional brick-cooking process, with high solar reflectance and high thermal emittance of colored glazes, engobes, and other composite multilayered tiles with the same visual appearance of classic bricks (Han, Lu, & Yang, 2009). Miller and Kriner demonstrated how these tiles are able to reduce the heat power entering building roofs up to 70%, minimize primary energy need for cooling up to 51%, with a relatively minor heating penalty of 2%.…”

Section: Cool Materials For Roofs and Urban Paving Systemsmentioning

confidence: 99%

Facing the urban overheating: Recent developments. Mitigation potential and sensitivity of the main technologies

Pisello

Saliari

Vasilakopoulou

et al. 2018

WIREs Energy & Environment

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Urban overheating represents an internationally acknowledged anthropogenic phenomenon related to climate change and to the massive shift of population worldwide toward urban areas, which are increasingly enlarging their size and density. The consequences of this urban warming (i.e., urban heat island) may compromise citizens' quality of life in urban areas, indoor and outdoor comfort perception, and building energy performance in summer conditions. In this panorama, this review presents recent contributions demonstrating the effectiveness and urgent need of existing mitigation strategies. The same strategies are also comparatively assessed by means of a sensitivity analysis demonstrating their effect with varying climate conditions and urban context. Results of existing studies, validated by the present assessment, aimed at quantitatively investigating the effect of mitigation strategies for reducing building cooling needs and enhancing urban well-being, thanks to international scientific effort carried out in the last decades. To this aim, the logical flow of the review deals with the main technologies for urban warming mitigation are described, together with the main findings of numerical and experimental research initiatives, demonstrating the field effect of improving pedestrians comfort and urban well-being all around the world. Then, the mitigation potential of key green, water and cool strategies is critically reviewed, and further scientific and implementation needs are discussed. All the reviewed contributions demonstrate an undeniable technology readiness level for their practical implementation and highlight the true necessity of a shared and synergistic policy effort worldwide.

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A composite cool colored tile for sloped roofs with high ‘equivalent’ solar reflectance

Cited by 34 publications

References 30 publications

Evaluating the Operational Potential of LRV Signatures Derived from UAV Imagery in Performance Evaluation of Cool Roofs

Evaluating the Operational Potential of LRV Signatures Derived from UAV Imagery in Performance Evaluation of Cool Roofs

Cool Surface Strategies with an Emphasis on the Materials Dimension: A Review

Facing the urban overheating: Recent developments. Mitigation potential and sensitivity of the main technologies

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