Studying the effect of “cool” coatings in street urban canyons and its potential as a heat island mitigation technique

Georgakis, C.; Zoras, Stamatis; Santamouris, M.

doi:10.1016/j.scs.2014.04.002

Cited by 79 publications

(41 citation statements)

References 9 publications

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“…Natural ventilation and air-tightness performance affect the indoor temperature and air quality, and the data are generally obtained by measurements. The indoor environment can also be affected by other factors, such as the urban heat island effect [2], and measures, e.g., cool roofs [18] and cool coatings [19], have been suggested to mitigate this.…”

Section: Scope Of Researchmentioning

confidence: 99%

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Development of Climate Indices Using Local Weather Data for Shading Design

Lee

Koo

et al. 2015

Sustainability

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Abstract:The energy performance of buildings depends on how effectively the building envelope responds to climate. Architects, therefore, need to design building envelopes with the consideration of local climate characteristics in the early design stage. Simplified formulas were used that evaluate the heating and cooling energy demand of building envelopes, which were applied to a model building with envelope and climate properties according to eight climate zones. Two climate indices, P and S, were developed. P enables the comparison of the heating and cooling energy demand of building envelopes, and S is for comparing the solar heat gain during heating and cooling seasons to review the feasibility of installing shading devices. The physical properties of envelopes were set differently according to the requirements in each climate zone proposed by American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) 90.1. Using local climate data, the P and S of 24 cities over eight climate zones in the United States were derived, which can be used to evaluate the heating and cooling energy characteristics of envelopes. The indices not only enable users to understand the characteristics of the local climate conditions in a simple manner, but also to carry out quantitative assessments on whether shading devices are feasible and, if so, what type is recommended. OPEN ACCESSSustainability 2015, 7 1885

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Section: Scope Of Researchmentioning

confidence: 99%

“…The value of S is between −1 and +1. (19) If S is close to +1, this means that the solar heat gain on cooling days is much bigger than the effective heat gain on heating days. Fixed shading devices, therefore, are recommended in this region.…”

Section: Development Of P and S Indicesmentioning

confidence: 99%

Development of Climate Indices Using Local Weather Data for Shading Design

Lee

Koo

et al. 2015

Sustainability

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“…In fact, pavements' thermal behavior is affected by convection due to traffic movement and by shadings due to people, traffic and urban structures, and a pavement's coat is subject to rapid dirtying and wearing. However, in the last decades, cool pavements have been developed and analyzed following the same principles used for the researches on cool roofs [21,53,54]. One of the first and relevant field measurement regarding cool pavements, conducted in Flisvos urban park in the greater Athens area, shows that extensive application of reflective pavements may reduce the peak daily ambient temperature during a typical summer day up to 1.9 • C, while surface temperatures were reduced up to 12 • C [52].…”

Section: Introductionmentioning

confidence: 99%

Assessment and Mitigation Strategies to Counteract Overheating in Urban Historical Areas in Rome

Laureti

Martinelli

Battisti

2018

Climate

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Abstract:As urban overheating is increasing, there is a strong public interest towards mitigation strategies to enhance comfortable urban spaces, for their role in supporting urban metabolism and social life. The study presents an assessment of the existing thermal comfort and usage of San Silvestro Square in Rome during the summer, and performs the simulation of cooling strategies scenarios, to understand their mitigation potential for renovation projects. The first stage concerns a field analysis of the thermal and radiative environment on the 1st and 2nd of August 2014, including meteorological measurements and unobtrusive observations, to understand how people experience and respond to extreme microclimate conditions. In the second stage, the research proposes scenario simulations on the same day to examine the influence of cool colored materials, trees and vegetative surfaces on thermal comfort. The thermal comfort assessment was based on Physiologically Equivalent Temperature (PET), whereas microclimatic simulations were conducted with CFD calculations (ENVImet v.4.3.1). The first stage shows a strong relationship between lower PET values and attendance rate, depending on daily shading patterns. The second stage shows a relevant improvement of thermal comfort, with PET values of −12 • C comparing to the no-intervention scenario, associated with a combination of cool materials and trees.

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“…They found out that air temperature above the WRP is much lower than the air temperature above lawn or building roof top. Georgakis et al (2014) evaluated cool pavements and roof coated with high reflection paints as UHI miti gation. They used computational fluid dynamics (CFD) model to calculate surface temperature and air temper ature within the urban canyon.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Water Retentive Pavement as Mitigation Strategy for Urban Heat Island Using Computational Fluid Dynamics

Cortes¹,

Shimadera²,

Matsuo³

et al. 2016

ajae

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Here we evaluated the effect of using water retentive pavement or WRP made from fly ash as material for main street in a real city block. We coupled computational fluid dynamics and pavement transport (CFD-PT) model to examine energy balance in the building canopies and ground surface. Two cases of 24 h unsteady analysis were simulated: case 1 where asphalt was used as the pavement material of all ground surfaces and case 2 where WRP was used as main street material. We aim to (1) predict diurnal variation in air temperature, wind speed, ground surface temperature and water content; and (2) compare ground surface energy fluxes. Using the coupled CFD-PT model it was proven that WRP as pavement material for main street can cause a decrease in ground surface temperature. The most significant decrease occurred at 1200 JST when solar radiation was most intense, surface temperature decreased by 13.8°C. This surface temperature decrease also led to cooling of air temperature at 1.5 m above street surface. During this time, air temperature in case 2 decreased by 0.28°C. As the radiation weakens from 1600 JST to 2000 JST, evaporative cooling had also been minimal. Shadow effect, higher albedo and lower thermal conductivity of WRP also contributed to surface temperature decrease. The cooling of ground surface eventually led to air temperature decrease. The degree of air temperature decrease was proportional to the surface temperature decrease. In terms of energy balance, WRP caused a maximum increase in latent heat flux by up to 255 W/m 2 and a decrease in sensible heat flux by up to 465 W/m 2 .

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Studying the effect of “cool” coatings in street urban canyons and its potential as a heat island mitigation technique

Cited by 79 publications

References 9 publications

Development of Climate Indices Using Local Weather Data for Shading Design

Development of Climate Indices Using Local Weather Data for Shading Design

Assessment and Mitigation Strategies to Counteract Overheating in Urban Historical Areas in Rome

Evaluation of Water Retentive Pavement as Mitigation Strategy for Urban Heat Island Using Computational Fluid Dynamics

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