Quantifying the direct benefits of cool roofs in an urban setting: Reduced cooling energy use and lowered greenhouse gas emissions

Xu, Tengfang; Sathaye, Jayant; Akbari, Hashem; Garg, Vishal; Tetali, Surekha

doi:10.1016/j.buildenv.2011.08.011

Cited by 123 publications

(52 citation statements)

References 13 publications

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“…Sustainability 2018, 10, x FOR PEER REVIEW 2 of 14 roof may detain the rainwater for the longer period of time, thus can reduce the risks for flash flooding problems in urban areas [6]. A green roof is also generally referred to as vegetated roof/living roof and eco-roof [7][8][9][10][11][12][13]. It can retain the runoff for a longer period of time than a common roof [2,6].…”

Section: Green Roof As a Mitigation Strategy For Urban Water Related mentioning

confidence: 99%

Green Roof for Stormwater Management in a Highly Urbanized Area: The Case of Seoul, Korea

Shafique

Kim

Kyung-Ho³

2018

Sustainability

101

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Urbanization changes natural pervious surfaces to hard, impervious surfaces such as roads, buildings and roofs. These modifications significantly affect the natural hydrologic cycle by increasing stormwater runoff rates and volume. Under these circumstances, green roofs offer multiple benefits including on-site stormwater management that mimics the natural hydrologic conditions in an urban area. It can retain a large amount of rainwater for a longer time and delay the peak discharge. However, there is very limited research that has been carried out on the retrofitted green roof for stormwater management for South Korean conditions. This study has investigated the performance of retrofitted green roofs for stormwater management in a highly urbanized area of Seoul, the capital city of Korea. In this study, various storm events were monitored and the research results were analyzed to check the performance of the green roof with controlling the runoff in urban areas. Results also allowed us to conclude that the retention mainly depends on the intensity and duration of the rain events. From the analysis, average runoff retention on the green roof was 10% to 60% in different rain events. The application of an extensive green roof provides promising results for stormwater management in the highly urbanized area of Seoul.

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Section: Green Roof As a Mitigation Strategy For Urban Water Related mentioning

confidence: 99%

Green Roof for Stormwater Management in a Highly Urbanized Area: The Case of Seoul, Korea

Shafique

Kim

Kyung-Ho³

2018

Sustainability

101

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“…In particular, passive cooling techniques, such as cool roofs and green roofs, are assuming increasing importance in the scientific community, interested in developing cost-optimal and sustainable techniques for this purpose [4,5]. In this respect, cool roofs and cool coatings in general represent passive solutions aimed at reducing solar gain entering building roofs and facades by means of the installation of highly solar reflective surfaces, e.g., tiles or paint coatings or shells [6][7][8]. Such systems are of interest to the scientific community for three reasons: they have been demonstrated to reduce energy requirements for cooling and to improve indoor thermal comfort under summer conditions [9,10] and additionally, their capability to reflect solar radiation can mitigate urban heat island and global warming phenomena [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Cool Traditional Solar Shading Systems for Residential Buildings

Pisello

2015

Energies

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Abstract:In recent years there has been a growing interest in the development and thermal-energy analysis of passive solutions for reducing building cooling needs and thus improving indoor thermal comfort conditions. In this view, several studies were carried out about cool roofs and cool coatings, producing acknowledged mitigation effects on urban heat island phenomenon. The purpose of this work is to investigate the thermal-energy performance of cool louvers of shutters, usually installed in residential buildings, compared to dark color traditional shading systems. To this aim, two full-scale prototype buildings were continuously monitored under summer conditions and the role of the cool shutter in reducing the overheating of the shading system and the energy requirements for cooling was analyzed. After an in-lab optical analysis of the cool coating, showing a huge solar reflectance increase with respect to the traditional configuration, i.e., by about 75%, field monitoring results showed that the cool shutter is able to decrease the indoor air temperature up to 2 °C under free floating conditions. The corresponding energy saving was about 25%, with even much higher peaks during very hot summer conditions.

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“…The results were based on thermal comfort indices such as the predicted mean vote (PMV) and physiological equivalent temperature (PET), as well as the three-dimensional non-hydrostatic model ENVI-met and computational fluid dynamics (CFD) simulations. DesignBuilder (DesignBuilder Software Ltd, UK), the integrated environmental solutions virtual environment software (IES VE), Energy Plus, and the thermos-radiative model SOLENE were used to evaluate the effects of planting greenery on buildings and cool loop system planning on the urban temperature and building energy consumption [24][25][26][27][28][29][30]. Next, there were studies on the measurement method of thermal comfort [31] and others assessing the impact of streets pavement on thermal comfort [32].…”

Section: Literature Reviewmentioning

confidence: 99%

Deduction of Optimum Surface Design Factors for Enhancement of Outdoor Thermal Environment in a Micro-Scale Unit

Jung

Yoon

2017

Sustainability

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Abstract:To solve some of the problems associated with changing urban climates, such as the heat island effect, the exterior building skin and ground surfaces should be analyzed because they are directly exposed to the outdoor climate and have the greatest impact on energy consumption. Research is needed to identify design factors to improve the effect of a building's skin in the outdoor summer season's thermal environment. In this study, the current conditions of outdoor thermal environments were identified by conducting field measurements at an apartment housing complex. A simulation analysis was conducted based on cases that included different design factors for a building's skin and ground surfaces. When the significance probability of the design factors for the surface plans for apartment buildings and surface cover was analyzed based on the Taguchi experimental design method, the window plan and surface cover plan influenced the outdoor thermal environment. Notably, the surface cover plan had the most significant impact on the outdoor thermal environment. The result of the analysis of the correlation between the design factors for an apartment complex's surface plans and outdoor thermal environment indices showed that the window plan correlated with the entire surface temperature of building and heat island potential (HIP).

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Quantifying the direct benefits of cool roofs in an urban setting: Reduced cooling energy use and lowered greenhouse gas emissions

Cited by 123 publications

References 13 publications

Green Roof for Stormwater Management in a Highly Urbanized Area: The Case of Seoul, Korea

Green Roof for Stormwater Management in a Highly Urbanized Area: The Case of Seoul, Korea

Experimental Analysis of Cool Traditional Solar Shading Systems for Residential Buildings

Deduction of Optimum Surface Design Factors for Enhancement of Outdoor Thermal Environment in a Micro-Scale Unit

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