Surface temperature analysis of an extensive green roof for the mitigation of urban heat island in southern mediterranean climate

Bevilacqua, Piero; Mazzeo, Domenico; Bruno, Roberto; Arcuri, Natale

doi:10.1016/j.enbuild.2017.05.081

Cited by 130 publications

(64 citation statements)

References 39 publications

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“…Based on the current literature, the energy-related performance of green roofs is still the most common benefit for which they are promoted and adopted [38]. Therefore, energy designers are very interested in their application, due to the reduction in roof surface temperature and solar heat to the covered building components [39], highlighting their contributions to both overall building thermal performance and microclimatic conditions in urban environments [40,41]. Green roofs improve the thermal performance of a building through different mechanisms:…”

Section: Green Roof Benefitsmentioning

confidence: 99%

Green Roof Design: State of the Art on Technology and Materials

Cascone

2019

Sustainability

163

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In order to consider green roofs as an environmentally friendly technology, the selection of efficient and sustainable components is extremely important. Previous review papers have mainly focused on the performance and advantages of green roofs. The objective of this paper is to examine the primary layers: The waterproof and anti-root membranes; the protection, filter, and drainage layers; the substrate; and the vegetation. First, the history, modern applications, benefits and classification are analyzed in order to present a well-defined state of the art of this technology. Then, the roles, requirements, characteristics, and materials are assessed for each green roof layers. This technology was compared to a conventional roof technology, Mediterranean climate conditions and their influence on green roof design were assessed, also comparing them with Tropical area and focusing on irrigation systems, examples about the commercial materials and products available in the market were provided and innovative materials coming from recycled sources were analyzed. Future research should evaluate new materials for green roof technologies, in order to enhance their performance and increase their sustainability. The information provided in this review paper will be useful to develop Mediterranean green roof guidelines for selecting suitable components and materials during the design and installation phases.

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Section: Green Roof Benefitsmentioning

confidence: 99%

Green Roof Design: State of the Art on Technology and Materials

Cascone

2019

Sustainability

163

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“…In order to characterize the green roof behaviour in relation to the urban heat island (UHI) phenomenon, the results of the surface temperature analysis have been summarized by the appropriate indexes. Based on the relevant work of [44,45], two indexes were defined, as follows: the first index, called surface temperature reduction (STR), was obtained by the ratio of the surface temperature of the i-th plot to the surface temperature of the reference Plot (the traditional bituminous roof). The STR can be evaluated in terms of average values (subscript av) or maximum values (subscript max):…”

Section: Analysis Of the Surface Temperature Of Green Roofs And A Conmentioning

confidence: 99%

Changes in Temperature and Moisture Content of an Extensive-Type Green Roof

et al. 2019

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Green roofs ought to be perceived as ensuring a wide-ranging contribution to the sustainable urban environment. The aim of the study was; (1) to investigate and analyse the differences in the surface temperature between four models of green roofs of the extensive type and a conventional roof (covered with bitumen) under the conditions of a continental climate; (2) to assess the influence of environmental parameters (climatic water balance, air temperature, relative humidity, moisture content in the profile) on changes in the temperature of the extensive type green roof profile (substrate and vegetation mat). The study (1) was carried out during the period of June–December 2016 using a thermal imaging camera. As a result, the greatest differences in temperature were noted in June and July, with a maximum difference between the temporary surface temperature of a green roof and a conventional roof of up to 24 °C. The (2) study was conducted on a green roof profile with sedum plant vegetation. The measured parameters were: the temperature of the surface, the temperature and humidity at depths of 3 cm and 15 cm, and active radiation in the photosynthesis process (PAR). As the result, the range of daily changes in the surface temperatures and the vegetation mat were higher than the range of changes in the air temperature. Atmospheric precipitation decreased the thermal gradient in the soil, as well as the temperature fluctuations in the course of a day as a result of the increase in humidity following a rainfall. During the summer period, over the course of a day, the surface temperature was 5 °C higher than the air temperature. The largest correlation was obtained between the air temperature and the temperature of the surface as well as the temperature of the structural layers.

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“…The maximum temperature of the bituminous roof reached 73.5 ± 1.4 • C, while the maximum average temperature in the green roof reached 34.8 ± 0.6 • C, [11]. Green roofs can also decrease the thermal load of the buildings [12,13].…”

Section: Introductionmentioning

confidence: 99%

The Role of the Extensive Green Roofs on Decreasing Building Energy Consumption in the Mediterranean Climate

et al. 2020

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Buildings portion in global energy consumption is 40%, and in the building envelope, the roof is a crucial point for improving indoor temperature, especially in the last and second last floors. Studies show that green roofs can be applied to moderate roof temperature and affect the indoor temperature in summer and winter. However, the performance of green roofs depends on several parameters such as climate, irrigation, layer materials, and thickness. In this context, the present research deals with a comprehensive experimental analysis of different thermal impacts of green roofs in summer and winter in a Mediterranean climate. Measurements carried out in one year in three different types of green roofs with different thicknesses, layers, and with and without the insulation layer. The analysis determined the possible period that indoor cooling or heating might be required with and without green roofs and demonstrated the positive impact of green roofs in moderating the roof temperature and temperature fluctuations, which in summer was remarkable. In conclusion, since in the Mediterranean climate, the thermal differences between green roofs and conventional roofs in summer are much higher than winter, it seems that the green roof without an insulation layer would show better performance.

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Surface temperature analysis of an extensive green roof for the mitigation of urban heat island in southern mediterranean climate

Cited by 130 publications

References 39 publications

Green Roof Design: State of the Art on Technology and Materials

Green Roof Design: State of the Art on Technology and Materials

Changes in Temperature and Moisture Content of an Extensive-Type Green Roof

The Role of the Extensive Green Roofs on Decreasing Building Energy Consumption in the Mediterranean Climate

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