Theoretical and experimental analysis of the thermal behaviour of a green roof system installed in two residential buildings in Athens, Greece

2009 ◽  
Vol 33 (12) ◽  
pp. 1059-1069 ◽  
Author(s):  
Aikaterini Sfakianaki ◽  
Elli Pagalou ◽  
Konstantinos Pavlou ◽  
Mat Santamouris ◽  
M. N. Assimakopoulos
Keyword(s):  
Thermal Behaviour ◽  
Experimental Analysis ◽  
Residential Buildings ◽  
Green Roof ◽  
Roof System

scholarly journals Energy consumption and CO2 emission reductions trough refurbishment of residential buildings’ roofs by applying the green roof system: Case study

2018 ◽  
Vol 22 (Suppl. 4) ◽  
pp. 1217-1229 ◽  
Author(s):  
Katarina Djordjevic ◽  
Olja Joksimovic ◽  
Milica Jovanovic-Popovic
Keyword(s):  
Energy Consumption ◽  
Co2 Emissions ◽  
Energy Savings ◽  
Residential Buildings ◽  
Structural Characteristics ◽  
Green Roof ◽  
Green Roofs ◽  
Noticeable Effect ◽  
Roof System ◽  
Positive Effects

Climate changes which we are experiencing at the moment are affecting the entire globe. Serbia, as a developing country, is in the process of defining its own energy strategy and priorities when it comes to the problem of increased energy consumption in its building stock. Research shows that residential sector consumes the largest quantity of energy. CO2 emissions present another big problem which is in a direct correlation with energy consumption. Green roofs have multiple positive effects on buildings and their surroundings which make them a desirable option for retrofitting roofs. The aim of this paper is to investigate thermal properties of chosen green roof system and its potential to positively influence energy consumption for heating buildings and therefore CO2 emissions trough refurbishing existing old flat roofs. New Belgrade was chosen for this research for its unique urban characteristics - existence of large number of similar or identical buildings, which have same structural characteristics and similar surroundings. For the purpose of this paper, blocks 45 and 70 were chosen. Results of this research are applicable on all of the 132 buildings found at this location, which have total roof area of 90990m2. By calculating energy quantity needed for heating the building with the existing roof and two hypothetical models, which have green roof, it was possible to quantify energy savings, which are in a direct correlation with CO2 emissions. A control roof was introduced in order to examine if the proposed green roof possesses better characteristics than a traditional solution, most commonly used in Serbia. Apart from energy savings, overall impact of the green roof on the CO2 reduction per building was calculated. By multiplying these results, we drew the conclusion that a project such as greening roofs of existing residential buildings in blocks 45 and 70 would have a noticeable effect on both the energy savings and CO2 emissions.

scholarly journals Heat Transfer Measurement within Green Roof with Incinerated Municipal Solid Waste Aggregates

2021 ◽  
Vol 13 (13) ◽  
pp. 7115
Author(s):  
Mostafa Kazemi ◽  
Luc Courard ◽  
Julien Hubert
Keyword(s):  
Heat Transfer ◽  
Heat Resistance ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Green Roof ◽  
Insulation Material ◽  
Drainage Layer ◽  
Roof System ◽  
Substrate Layer ◽  
Significant Difference

A green roof is composed of a substrate and drainage layers which are fixed on insulation material and roof structure. The global heat resistance (Rc) within a green roof is affected by the humidity content of the substrate layer in which the coarse recycled materials can be used. Moreover, the utilization of recycled coarse aggregates such as incinerated municipal solid waste aggregate (IMSWA) for the drainage layer would be a promising solution, increasing the recycling of secondary resources and saving natural resources. Therefore, this paper aims to investigate the heat transfer across green roof systems with a drainage layer of IMSWA and a substrate layer including recycled tiles and bricks in wet and dry states according to ISO-conversion method. Based on the results, water easily flows through the IMSWAs with a size of 7 mm. Meanwhile, the Rc-value of the green roof system with the dry substrate (1.26 m2 K/W) was 1.7 times more than that of the green roof system with the unsaturated substrate (0.735 m2 K/W). This means that the presence of air-spaces in the dry substrate provided more heat resistance, positively contributing to heat transfer decrease, which is also dependent on the drainage effect of IMSWA. In addition, the Rc-value of the dry substrate layer was about twice that of IMSWA as the drainage layer. No significant difference was observed between the Rc-values of the unsaturated substrate layer and the IMSWA layer.

On the green roof system. Selection, state of the art and energy potential investigation of a system installed in an office building in Athens, Greece

2008 ◽  
Vol 33 (1) ◽  
pp. 173-177 ◽  
Author(s):  
A. Spala ◽  
H.S. Bagiorgas ◽  
M.N. Assimakopoulos ◽  
J. Kalavrouziotis ◽  
D. Matthopoulos ◽  
...  
Keyword(s):  
State Of The Art ◽  
Green Roof ◽  
Office Building ◽  
Energy Potential ◽  
Roof System ◽  
System Selection

The effect of drainage height on plant-species composition on a semi-arid green roof system

2021 ◽  
Vol 67 (3-4) ◽  
pp. 149-155
Author(s):  
Har'el Agra ◽  
Hadar Shalom ◽  
Omar Bawab ◽  
Gyongyver J. Kadas ◽  
Leon Blaustein
Keyword(s):  
Species Composition ◽  
Plant Species ◽  
Plant Diversity ◽  
Urban Areas ◽  
Green Roof ◽  
Growing Season ◽  
Green Roofs ◽  
Plant Species Composition ◽  
Roof System ◽  
Semi Arid

Abstract Green roofs are expected to contribute to higher biodiversity in urban surroundings. Typically, green roofs have been designed with low plant diversity. However, plant diversity can be enhanced by controlling resource availability and creating distinct niches. Here we hypothesize that by using different drainage heights during the short plant-growing season in a semi-arid green roof system we can create distinct niches and plant communities. Our experiment took place at the University of Haifa, north Israel. We tested three different heights of drainage outlet: 10 cm under the surface of the substrate (Low), 1 cm under the surface of the substrate (Medium) and 3 cm above the surface of the substrate (High) on plant species-composition in green-roof gardens. Grasses cover was higher in High and Medium drainages while forbs cover was higher in Low drainage. Species richness was the highest in Low drainage while diversity indices showed the opposite trend. We conclude that by changing the height of the drainage we can create different niches and change species composition in a short time period of one growing season. This way we can create more diverse green roof communities and enhance biodiversity in urban areas, particularly in semi-arid regions.

Thermal behaviour of a green roof containing insulation cork board. An experimental characterization using a bioclimatic chamber

2019 ◽  
Vol 160 ◽  
pp. 106179 ◽  
Author(s):  
Ricardo Almeida ◽  
Nuno Simões ◽  
António Tadeu ◽  
Paulo Palha ◽  
João Almeida
Keyword(s):  
Thermal Behaviour ◽  
Green Roof ◽  
Experimental Characterization
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