How accelerated biological aging can affect solar reflective polymeric based building materials

Ferrari, Chiara; Santunione, Giulia; Libbra, Antonio; Muscio, Alberto; Sgarbi, Elisabetta

doi:10.1088/1742-6596/923/1/012046

Cited by 4 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Soiling and weathering can reduce the solar reflectance of a CEM. Roof albedo is especially sensitive to soot deposition and biological growth [133,154,171,[213][214][215][216][217][218][219][220][221][222][223][224][225][226][227], while wall albedo is less affected by natural exposure [Appendix J of 27,228]. Cleaning can restore the initial albedo of some roofing materials [220], but this does not appear to be a common practice.…”

Section: Limitationsmentioning

confidence: 99%

International Energy Agency EBC Annex 80 - Resilient Cooling of Buildings - State of the Art Review

Zhengtao,

Akander,

Arens

et al. 2022

View full text Add to dashboard Cite

The world is facing a rapid increase of air conditioning of buildings. It is the motivation of Annex 80 to develop, assess and communicate solutions of resilient cooling and overheating protection. Resilient Cooling is used to denote low energy and low carbon cooling solutions that strengthen the ability of individuals and our community to withstand, and prevent, thermal and other impacts of changes in global and local climates. It encompasses the assessment and Research & Development of both active and passive cooling technologies of the following four groups:  Reduce heat loads to people and indoor environments.  Remove sensible heat from indoor environments.  Enhance personal comfort apart from space cooling.  Remove latent heat from indoor environments. The present review sums up the state of the art in cooling solutions which may be regarded as resilient. Its main objective is to systematically describe the available cooling solutions, their physical basis, their benefits and limitations, their technology readiness level, their practical availability, and applicability. Doing so, the State-of-the-Art Review forms the basis for the work of EBC Annex 80.

show abstract

Section: Limitationsmentioning

confidence: 99%

International Energy Agency EBC Annex 80 - Resilient Cooling of Buildings - State of the Art Review

Zhengtao,

Akander,

Arens

et al. 2022

View full text Add to dashboard Cite

show abstract

“…No entanto, o envelope dos edifícios em áreas urbanas está sujeito à degradação pela exposição ao intemperismo natural, assim como à deposição de material particulado presente no ar, com efeitos diretos sobre a absortância solar dessas superfícies (PAOLINI et al, 2014). Resultados de diversas pesquisas têm demonstrado que o envelhecimento natural do envelope construtivo aumenta a absortância solar dessas superfícies em relação a suas absortâncias originais (FERRARI et al, 2017;PEREIRA, 2014;TSOKA et al, 2018). Para alguns tipos de revestimentos, Tsoka et al (2018) comprovaram redução da refletância em até 40% como consequência do intemperismo e do envelhecimento natural das amostras.…”

Section: Introductionunclassified

Estação de envelhecimento natural para análise de degradação da absortância de telhas e monitoramento de temperaturas superficiais

Dornelles

Araujo

2022

Ambient. constr.

View full text Add to dashboard Cite

Resumo O uso de materiais de baixa absortância solar no envelope construtivo tem se mostrado uma estratégia eficaz para otimizar o desempenho termoenergético de edificações em locais com alta incidência de radiação solar. No entanto, a capacidade refletiva dos revestimentos se modifica ao longo do tempo, devido à degradação pela ação das intempéries e à deposição de material particulado, com prejuízos ao desempenho térmico da vedação ao longo de sua vida útil. Assim, determinar os efeitos da degradação da absortância solar tornou-se primordial para prever a capacidade de manutenção das propriedades refletivas de telhas e tintas com o tempo. Com o objetivo de contribuir com pesquisas nessa temática, este artigo apresenta o projeto, construção e operação de uma estação de envelhecimento natural para avaliação da degradação da absortância solar de telhas e revestimentos expostos ao tempo, em conjunto com o monitoramento simultâneo e contínuo de temperaturas superficiais com termopares. Os resultados obtidos para 28 telhas expostas por 2 anos indicam forte correlação (R² = 0,81) entre as temperaturas superficiais e a absortância solar ao longo do tempo, assim como o potencial de uso da estação de envelhecimento natural para análise conjunta da degradação da absortância e o desempenho térmico dos revestimentos.

show abstract

“…However, building envelopes in the urban environment are subject to weather and the deposition of particulate matter present in the air, with direct effects on the solar reflectance of these surfaces [17] . Results from several researches indicated that natural weathering of roof surfaces decreased the original solar reflectance over time [18][19][20][21][22][23] . By this way, durability has become an important issue for new materials considering the potential of preserving high SR over time, since the higher initial investment must be paid back by cooling energy savings [24] .…”

Section: Introductionmentioning

confidence: 99%

“…Degradation, however, induces chemical changes in the material with permanent alteration of the solar reflectance. Previous researches have indicated that degradation of roof coatings is mainly related to insolation (particularly UV radiation), temperature variation of the roof (daily time-averaged), moisture (humidity, rain, and dew), and natural and anthropogenic pollutants [19,20,23] . Furthermore, the solar reflectance degradation of coatings occurred primarily within the first year of application, and even within the first two months of exposure [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging on Solar Reflectance of White Cool Roof Coatings: Natural Weathering and the Influence on Building Energy Needs for Different Climate Conditions in Brazil

Dornelles

2021

j. of archit. environ. & struct. eng. res.

View full text Add to dashboard Cite

The use of cool materials on the building envelope is one of the most cost-effective ways to increase indoor thermal comfort conditions in hot climates and decrease the cooling energy needs. Despite the benefit of reducing cooling loads, researches have demonstrated that aging of roof coatings changes the initial SR, which influences the long term building thermal and energy performance. Thus, this work presents preliminary natural weathering tests performed on samples of nine white coatings exposed to natural weathering for one year in the city of Sao Carlos, Brazil. Solar reflectances were measured with a spectrophotometer before and after exposure, every 3 months, for identifying the effect of aging along the time. The findings showed a decrease on the SR from 13% to 23% after one year of natural weathering, with higher decrease for rougher surfaces. The cleaning process restored from 90% to 100% of the original SR, which means maintenance can be an effective solution to restore the initial SR. Simulations indicated that roofs with higher SR increase indoor thermal comfort conditions and decrease the cooling energy need for buildings in hot climates, but the aging of white coatings increased the cooling energy needs along the time.

show abstract

How accelerated biological aging can affect solar reflective polymeric based building materials

Cited by 4 publications

References 17 publications

International Energy Agency EBC Annex 80 - Resilient Cooling of Buildings - State of the Art Review

International Energy Agency EBC Annex 80 - Resilient Cooling of Buildings - State of the Art Review

Estação de envelhecimento natural para análise de degradação da absortância de telhas e monitoramento de temperaturas superficiais

Effect of Aging on Solar Reflectance of White Cool Roof Coatings: Natural Weathering and the Influence on Building Energy Needs for Different Climate Conditions in Brazil

Contact Info

Product

Resources

About