scholarly journals Modeling, Monitoring, and Validating Green Roof and Green Facade Solutions with Semantic City Models Using Low Cost Sensors and Open Software Infrastructures

Urban Science ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 39
Author(s):  
Vo ◽  
Nichersu ◽  
Wendel
Keyword(s):  
Data Storage ◽  
Energy Savings ◽  
Low Cost ◽  
Green Roof ◽  
Green Roofs ◽  
Balance Principle ◽  
Green Façade ◽  
Thermal Influence ◽  
Green Facade ◽  
City Models

The usage of greenery systems as nature-based solutions to assist in urban cooling in summer time as well as urban warming in wintertime is considered a scientific validated approach in urban planning. The objective of this research is the investigation and quantification of the role of green roofs and green facade solutions concerning thermal behavior in buildings energy savings by using standardized semantic city models that allow the quantification of such measures on district and city scales. The implemented model uses standardized geospatial data based on the CityGML format, a semantic city model standard, for analysis and data storage. For storage of the thermal properties of the buildings, the behavior of its occupants as well as the sensor measurements the Energy ADE of the CityGML standard was used. A green roof/façades model was implemented to simulate the heat transfer in a building based on the heat balance principle of foliage, soil, and structural layers. This model allows analyzing the thermal influence of plant and substrate layers on the heat gains from incoming solar radiation into buildings and the heat losses. This implementation was validated for cooling solutions using monitoring data from real-time experiments during summer measurements at three locations in Germany. Results from this experiment correspond well with the findings of other relevant studies. A sensitivity analysis was conducted to test the impacts of climate, substrate and plants on the greenery layer performance.

scholarly journals COBERTURA E FACHADA VERDE:

2019 ◽  
Vol 8 (2) ◽  
pp. 89-100
Author(s):  
Thiago Youzi Kussaba Kayano ◽  
Nuria Perez Gallardo ◽  
Bruno César dos Santos ◽  
Mauricio Sanches Duarte Silva ◽  
Rafael Perussi ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Thermal Performance ◽  
Green Roof ◽  
Green Roofs ◽  
Sao Paulo ◽  
Test Cell ◽  
São Paulo ◽  
Control Test ◽  
Green Façade ◽  
Green Facade

Com a busca de alternativas para melhorar o conforto ambiental em ambientes construídos, os sistemas de fachadas e tetos verdes aparecem como uma opção para melhoria, em especial, do conforto térmico. Utilizando-se de um episódio climático representativo no mês de junho de 2016, analisou-se comparativamente o comportamento térmico de uma célula de teste com fachada e teto verde e uma célula de controle para avaliação do desempenho térmico em dia crítico experimental de frio. O experimento foi realizado no Centro de Recursos Hídricos e Estudos Ambientais (CRHEA) da Universidade de São Paulo (USP), em Itirapina-SP. Os resultados indicaram que a célula de teste com fachada e teto verde possui um melhor desempenho térmico em comparação à célula de controle. Palavras-chave: desempenho térmico, episódio climático representativo, comportamento térmico, fachada verde, cobertura verde. Abstract In searching for better thermal behavior alternatives in building environments green facade systems and green roofs emerge as an improvement option, particularly in thermal comfort. Using a representative climate episode to analyze the month of June of 2016 we studied the thermal performance of a green façade and green roof test cell and a control test cell in experimental critical cold day. The experiment was made in Water Resource and Environmental Studies Center (CRHEA) of University of São Paulo (USP), in Itirapina-SP. The results indicated the green wall and green roof test cell have a better thermal performance than control test cell. Keywords: Thermal performance, climatic representative episode, thermal behavior, green façade, green cover.

Prospects and restraints of green roofs for high-rise buildings in Sri Lanka

2019 ◽  
Vol 10 (2) ◽  
pp. 246-260
Author(s):  
Subaskar Charles ◽  
Herath Vidyaratne ◽  
Damithri Gayashini Melagoda
Keyword(s):  
Sri Lanka ◽  
Questionnaire Survey ◽  
Energy Savings ◽  
Green Roof ◽  
Green Roofs ◽  
Sri Lankan ◽  
Expert Interviews ◽  
Content Type ◽  
High Rise ◽  
The Government

Purpose Green roofs are acknowledged as a method to substitute greenery washed out by the urbanization. They provide many ecological and sustainable benefits of greenery; reduce the adverse effects of high-rise building constructions. Though this concept is more popular across many countries over the past few decades, still, implementation of this technology in Sri Lanka is new and scant. Hence, the purpose of this paper is to identify and analyze the potential of green roofs in high-rise buildings in Sri Lanka. Design/methodology/approach The data collection was conducted through expert interviews and questionnaire survey. Expert interviews were carried out to validate the prospects and restraints identified through literature review to the Sri Lankan context and analyzed using content analysis. Questionnaire survey identified the most significant prospects and restraints using descriptive statistics and paired sample t-test. Purposive sampling was used to select participants. Findings Reduction of air pollution, aesthetical appearance, thermal benefits and energy savings, reduction of an urban heat island effect, the addition of points in the green rating system are the top most significant prospects that need to be highlighted in promoting green roof systems in Sri Lankan high rises. Less space allocation on rooftops, lack of technical competence and lack of awareness and research are restraints that need most effective elimination strategies to encourage green roof systems. Originality/value The first identified and quantified prospects and restraints for green roof system in Sri Lankan high-rise buildings can be utilized by the government, donors, multi-lateral agencies to promote the sustainable development in Sri Lanka and this knowledge could be used in different scale awareness programs. The value of this paper is such that the paper discusses the links of green roofs with the other facets of sustainability. The new legal reforms and amendments in Sri Lanka could potentially be pending with findings of this study.

Vegetation as a Material of Roof and City to Cool down the Temperature

2012 ◽  
Vol 461 ◽  
pp. 552-556 ◽  
Author(s):  
Chen Yi Sun ◽  
Kuei Peng Lee ◽  
Tzu Ping Lin ◽  
Soen Han Lee
Keyword(s):  
Green Space ◽  
Thermal Environment ◽  
Green Roof ◽  
Green Roofs ◽  
Green Spaces ◽  
Maximum Temperature ◽  
Environmental Benefit ◽  
Maximum Temperature Difference ◽  
Thermal Influence ◽  
Maximum Cool

A large amount of research has been published in Taiwan on the reduction of the urban temperature for different strategies. The most important strategy for reducing ambient temperature is increasing green roofs or green spaces in city. For analyzing the effect of the vegetation on the thermal environment, this paper collects temperature and humidity data from two building roofs, one park and two streets which are located within same area and tries to analyze the thermal influence of vegetation in study area. The result of this research shows that the maximum cool effect of green roof was -1.60 °C and the maximum temperature difference between park and street was -2.00 °C. Therefore, it can also provide useful data to governments for calculating the environmental benefit if they carry out a green space and green roof policy.

Energy Efficiency of “Green Structures” in Cooling Period

2018 ◽  
Vol 7 (3.2) ◽  
pp. 453
Author(s):  
Tkachenko Tetiana ◽  
. .
Keyword(s):  
Co2 Emissions ◽  
Energy Savings ◽  
Transition Period ◽  
Green Roof ◽  
Green Roofs ◽  
Cooling Effect ◽  
Solid Fuels ◽  
Practical Recommendation ◽  
Cooling Period ◽  
Reduction Of Co2

The proposed methodology for estimating the reduction of CO2 emissions by green constructions (green roof and facade greening) due to the “cooling effect” during the cooling period allows to calculate CO2 savings in warm periods of the year. For Kyiv, in July, the reduction of CO2 emissions per m2 at coal using is 133 g / m2, during the warm period of the year – 515 g / m2; using gas – 78 g / m2 and 303 g / m2. It is established that the energy savings of a green roof depends on the thickness of the thermal insulation of buildings: the thicker insulation causes the less green roof contribution to energy savings. However, the significance of their effectiveness remains. Green roofs can be especially effective in switching from gas to local solid fuels: peat waste, pellets, etc. As a practical recommendation, it is proposed to coordinate the placement of greened and ungreen parts of the green roof with rooms under the roof, which allows to reduce the refrigeration load on air conditioning. In addition, recommendations on grass care on the green roof have been developed. To maximize the cooling effect, it is necessary to maintain grass height no more than120 mm. Before the beginning of the transition period, it is necessary to stop mowing the grass, which reduces the cooling effect.  

scholarly journals Green roofs in building retrofits: outdoor microclimate benefits and energy savings

2021 ◽  
Author(s):  
Melissa Ann Furukawa
Keyword(s):  
Energy Consumption ◽  
Energy Demand ◽  
Energy Savings ◽  
Soil Depth ◽  
Green Roof ◽  
Green Roofs ◽  
Area Index ◽  
Heating And Cooling ◽  
Building Energy Analysis ◽  
The Impact

The impact of green roof retrofits on the local microclimate and energy consumption of a building is investigated. This research is based on a case study of Kerr Hall located on the Ryerson University campus in Toronto. The software ENVI-met is used to simulate the microclimate while EnergyPlus is used for the building energy analysis. Results indicate that increasing the leaf area index (LAI) of the green roof leads to increased cooling effect up to 0.4 degrees C during the day at pedestrian-level; however, more significant cooling is attained at the rooftop-level. The addition of the green roof reduced both the heating and cooling demands and improved indoor comfort levels. Energy demand reductions up to 3% were obtained with the green roof retrofits with the biggest contribution form from reduction in heating on the top floor. Increasing the soil depth had a larger impact on the energy consumption compared to increasing the LAI.

The role of green roof technology in urban agriculture

2011 ◽  
Vol 27 (4) ◽  
pp. 314-322 ◽  
Author(s):  
Leigh J. Whittinghill ◽  
D. Bradley Rowe
Keyword(s):  
Urban Communities ◽  
Urban Agriculture ◽  
Management Practices ◽  
Energy Savings ◽  
Green Roof ◽  
Food Contamination ◽  
Ground Level ◽  
Green Roofs ◽  
Land Use Rights

AbstractUrban agriculture is a global and growing pursuit that can contribute to economic development, job creation, food security and community building. It can, however, be limited by competition for space with other forms of urban development, a lack of formalized land use rights and health hazards related to food contamination. The use of green roof technology in urban agriculture has the potential to alleviate some of these problems, without adversely affecting the benefits provided by urban agriculture. It would not only enable the use of land for development and agriculture, but may also facilitate the formation of formal space and water use agreements, and enable redistribution of ground-level resources among urban farmers. This could decrease the use of contaminated land and water at ground level and alleviate health concerns. Before green roof technology can be incorporated into urban agriculture on a larger scale, installation costs must be reduced, roof weight limitations should be assessed, and appropriate management practices should be developed which will ensure that the benefits of green roofs, such as energy savings and storm water management, are still provided to urban communities.

scholarly journals Parametric simulation study for green roof retrofit over high performance solar house prototype “EFdeN Signature”

2019 ◽  
Vol 111 ◽  
pp. 04012
Author(s):  
Mihai BAICEANU ◽  
Tiberiu CATALINA
Keyword(s):  
Energy Demand ◽  
High Performance ◽  
Energy Savings ◽  
High Efficiency ◽  
Green Roof ◽  
Green Roofs ◽  
Area Index ◽  
Roof System ◽  
Low Efficiency ◽  
Solar House

The advantages of green roofs are well documented, ranging from heat island reduction, thermal comfort, air quality, stormwater management and energy savings for buildings. However, it has been shown that green roof retrofits are more effective in old, low efficiency buildings. This paper studies the possibility of retrofitting a high efficiency solar house with a green roof system being partially shaded, optimising its characteristics by means of parametric simulation. The input variables of the green roof system are: growth medium thickness, LAI (leaf area index) and height of plants. The output variables by which the different green roof systems are compared are: annual energy demand for heating and for cooling. The study concluded that the average reductions of energy consumption when retrofitting an efficient building with an extensive green roof are of 1.01% for heating and 4.61% for cooling, but optimising parameters (low LAI in winter, high LAI and height of plants in summer) can get reductions to 1.55% for cooling and 5.95% for cooling.

The Impact of Different Green Roofs Strategies on the Indoor Thermal Comfort with Special Reference to Cairo-Egypt

2014 ◽  
Vol 935 ◽  
pp. 38-43 ◽  
Author(s):  
Samar Mohamed Sheweka ◽  
Nourhan Magdy
Keyword(s):  
Thermal Comfort ◽  
Energy Savings ◽  
New Technology ◽  
Green Roof ◽  
Green Roofs ◽  
Green Buildings ◽  
Current Crisis ◽  
Indoor Thermal Comfort ◽  
Save Energy ◽  
The Impact

In present time, the environmental impact of green buildings on inner and outer climate has becomes more apparent. Green buildings are designed to reduce the overall impact of the built environment on human health and the natural environment. Recently, the popularity of green roof is growing in the context of urban landscaping because of its smaller footprint, aesthetic value, insulation benefits and heat island mitigation impact. Greenery roofs are considered to be a part of new technology that allows the use of alternative vegetation. This paper will explore the potentials of using green roofs as an integral part of the building process to save energy. This paper will introduce the energy crisis and will focus on the current crisis in Egypt and the global UHI effect. It will also identify the impact of vegetation as a sustainable approach for UHI mitigation and energy savings. After addressing green roof types, and their functional, and environmental aspects in general. The paper distills these different types to enhance thermal performance in terms of indoor thermal comfort and energy savings with the integration of PV cells within green roof design. This will be empirically examined by DesignBuilder and EnergyPlus Simulation, to explore the possibilities of improving indoor thermal comfort within the studied types. Then the paper will be concluded by a set of recommendations for buildings within Egypt’s climatic settings.

scholarly journals Impact of a building shape factor on space cooling energy performance in the green roof concept implementation

2018 ◽  
Vol 22 (1 Part B) ◽  
pp. 687-698 ◽  
Author(s):  
Marija Stamenkovic ◽  
Mirjana Miletic ◽  
Saja Kosanovic ◽  
Goran Vuckovic ◽  
Srdjan Glisovic
Keyword(s):  
Shape Factor ◽  
Energy Savings ◽  
Green Roof ◽  
Green Roofs ◽  
Energy Performance ◽  
Environmental Benefits ◽  
Existing Buildings ◽  
Building Shape ◽  
Building Models ◽  
Space Cooling

The reduction of energy demand for space cooling requires adequate solutions at building and built environment scales in order to achieve sustainability goals. Since many existing buildings have inadequate envelopes for reducing heat gains in summer and heat losses in winter, environmentally friendly renovation techniques have to be considered. The roofs of existing buildings were identified as a field of intervention which could contribute to providing both energy savings and environmental benefits. The aim of the paper was to evaluate the contribution of green roofs to energy savings for space cooling depending on the building shape factor. Two groups of building models, with vertical and horizontal expansions, were analysed. The comparative analyses of the building models with conventional and green roofs showed small reduction of energy consumption less than 1% in case of well-insulated roofs with the addition of the extensive green roof. The comparison of different building models with green roofs of the same volume, which is in this case the same cooling area, indicated a more effective solution for green roofs implementation with the aim to improve energy performances of existing buildings using this passive design technique.

scholarly journals Green roofs in building retrofits: outdoor microclimate benefits and energy savings

2021 ◽  
Author(s):  
Melissa Ann Furukawa
Keyword(s):  
Energy Consumption ◽  
Energy Demand ◽  
Energy Savings ◽  
Soil Depth ◽  
Green Roof ◽  
Green Roofs ◽  
Area Index ◽  
Heating And Cooling ◽  
Building Energy Analysis ◽  
The Impact

The impact of green roof retrofits on the local microclimate and energy consumption of a building is investigated. This research is based on a case study of Kerr Hall located on the Ryerson University campus in Toronto. The software ENVI-met is used to simulate the microclimate while EnergyPlus is used for the building energy analysis. Results indicate that increasing the leaf area index (LAI) of the green roof leads to increased cooling effect up to 0.4 degrees C during the day at pedestrian-level; however, more significant cooling is attained at the rooftop-level. The addition of the green roof reduced both the heating and cooling demands and improved indoor comfort levels. Energy demand reductions up to 3% were obtained with the green roof retrofits with the biggest contribution form from reduction in heating on the top floor. Increasing the soil depth had a larger impact on the energy consumption compared to increasing the LAI.

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