Substrate moisture effect on water balance and thermal regime of a tropical extensive green roof

Jim, Chi Yung; Peng, Lilliana L.H.

doi:10.1016/j.ecoleng.2012.06.020

Cited by 90 publications

(56 citation statements)

References 25 publications

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“…The literature has generated extensive studies on green-roof thermal effects in various climatic contexts. These studies roughly fall into three categories in terms of study approaches and objectives, including: (1) on-site monitoring to investigate green-roof impacts on summer temperature parameters and building heat flux patterns [9][10][11][12][13][14][15][16][17][18][19][20][21][22]; (2) dynamic energy modeling to analyze the heat and moisture processes within the green-roof layers and identify key influential factors [23][24][25][26][27][28]; and (3) building energy simulation or meso-scale climatic modeling to predict the cooling and energy effects of individual or multiple green-roof installations [29][30][31][32][33][34]. The studies have reported that green roofs can reduce summer daily peak surface temperature by 15 °C-45 °C and peak air temperature by up to 5 °C.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Diurnal Thermal Performance of a Subtropical Extensive Green Roof: The Impacts of Background Weather Parameters

Peng

Jim

2015

Sustainability

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Most studies explored green-roof thermal effects on a few hot summer days based on short-term monitoring data. Few studies investigated the seasonal and diurnal patterns of thermal performance and associated weather effects. This research aims to address the following two questions: (1) how green-roof thermal performance varies with different season and time; and (2) to what extent can thermal performance be predicted by background weather parameters? A retrofitted extensive green roof was established on the top of a railway station in subtropical Hong Kong. Monitoring data covering a two-year period, one year before roof greening and one year after, were collected and analyzed. Results indicated notable seasonal and diurnal patterns of green-roof thermal performance. It exhibited cooling effects in spring, summer and fall, but warming effects in winter. The cooling effects were more pronounced in summer than spring and fall, on sunny days than rainy and cloudy days, and in nighttime than daytime. Air temperature, relative humidity, wind speed, solar radiation, and soil moisture could explain 83.6%-86% of the thermal effects' variation. The multiple-regression models based on the five weather variables established in this study provide an uncomplicated and direct approach to predict the thermal performance of similar extensive green roofs in subtropical areas. OPEN ACCESSSustainability 2015, 7 11099

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Section: Introductionmentioning

confidence: 99%

Seasonal and Diurnal Thermal Performance of a Subtropical Extensive Green Roof: The Impacts of Background Weather Parameters

Peng

Jim

2015

Sustainability

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“…Whilst some storage of rainwater will occur in the drainage 955 mat, the majority is likely to be stored in the substrate layer (Bianchini & Hewage,956 2012). The temporary storage of rainfall and its slow release will allow the system to 957 detain rainfall, attenuate peak runoff flows and discharge runoff for a longer period of rates and can be expected to contribute to green roof retention (Jim & Peng, 2012). 1146…”

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confidence: 99%

Hydrological performance of a full-scale extensive green roof located in a temperate climate

Nawaz

McDonald

Postoyko

2015

Ecological Engineering

116

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“…Another research work done in Singapore reveals that the thermal resistance of roof can be increased by 0.4 KW for every 10-cm increase in the thickness of the substrate layer with clay [27]. Water content the in soil layer also changes the thermal properties of it, as more water content can increase the thermal conductivity of the layer [28]. Organic matter in soil also maintains good soil structure [29].…”

Section: Literature Review On the Green Roofmentioning

confidence: 99%

Impact of Green Roof and Orientation on the Energy Performance of Buildings: A Case Study from Saudi Arabia

Khan¹,

Asif²

2017

Sustainability

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Saudi Arabia is one of the largest countries in the Middle East region in terms of population, geographic area and scale of economy. It has a fast growing energy sector with over 76% of the total electricity being consumed in the building sector. Domestic buildings account for 51% of total electricity consumption. Predominantly due to hot climatic conditions, most of the energy consumption in buildings is attributed to the heating, ventilation and air conditioning (HVAC) loads. In terms of supply mix, the country entirely relies on oil and gas to meet its energy requirements. The high growth in energy demand is imposing stringent energy, environmental and economic challenges for Saudi Arabia. The present work aims to explore prospects of energy saving in buildings through the application of green roof technology. With the help of ECOTECT modelling, the work examines the effectiveness of green roof on considering modern faculty homes built in the King Fahd University of Petroleum and Minerals situated in the hot-humid climatic conditions of the Easter Province of the country. The same building has also been investigated for the hot-dry climate of Riyadh, the capital city. The work also examines the impact of orientations on the energy performance of buildings.

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Substrate moisture effect on water balance and thermal regime of a tropical extensive green roof

Cited by 90 publications

References 25 publications

Seasonal and Diurnal Thermal Performance of a Subtropical Extensive Green Roof: The Impacts of Background Weather Parameters

Seasonal and Diurnal Thermal Performance of a Subtropical Extensive Green Roof: The Impacts of Background Weather Parameters

Hydrological performance of a full-scale extensive green roof located in a temperate climate

Impact of Green Roof and Orientation on the Energy Performance of Buildings: A Case Study from Saudi Arabia

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