4:30pm - 4:45pmEstimating Impact of Green-Blue Infrastructure on Air Temperature Using Remote Sensing
Parth Bansal
Seoul National University, Korea
With the availability of high quality remote sensing data, the phenomena of urban heat island has been well documented over the past two decades. Various mitigation measures, including changes to urban form, construction material, etc. have been suggested; however, these factors tend to be static and have a long gestation period. Water and forest body have higher specific heat compared to urban built up and thus have a lower surface temperature during the afternoon, when the temperature generally peaks. Many indigenous civilizations have used this ‘cooling effect’, but the effectiveness of water and forest bodies on cooling is poorly understood. This study uses remote sensing data, specifically, thermal imagery from Landsat 7 and 8 satellites to calculate the quantity and range of cooling due to the combined presence of water body and green strip along the water’s shore. The study finds that in the studied area, the cooling effect ranges from 1.1 to 3.9˚ C but with a maximum effective range of 360 meters under the favourable wind conditions. The short range of cooling effect raises questions if green-blue infrastructure can be an effective way to combat UHI in the dense urban area where land is scarce and expensive.
4:45pm - 5:00pmRetrofit of an Existing School Building: A case study from Hyderabad, India
Vertika Srivastav1, Swati Puchalapalli2, Sanyogita Manu3
1CEPT University, India; 2Terra Viridis, Hyderabad; 3CEPT University, India
Retrofit of naturally ventilated educational building is an effective solution to the thermal and visual discomfort problems of the occupants. A residential school, located in outskirts of Hyderabad, India. The school functions in an International Baccalaureate (IB) Curriculum. The building has IGBC Platinum rating. The project deals with the retrofit procedure of the Senior Academic Block, which is naturally ventilated. The procedure involved assessment of the existing conditions through climate analysis, thermal images, measurements & occupant surveys. The retrofit design proposal was then presented to the owners and further prioritization and optimization of the scenarios were done based on thermal and daylighting simulations. The tools used for the analysis were EDSL TAS and LightStanza. Replacement of windows and addition of a low-energy cooling system (evaporative cooler) was identified as the best solutions.
5:00pm - 5:10pmDesigning Naturally Conditioned Dwellings for Chile
Gabriel Felmer, Simos Yannas
Environment & Energy Studies Programme, Architectural Association School of Architecture, London, UK
The techniques applied in this paper were planned to minimise the additional energy and capital costs required for achieving occupant thermal comfort in Chilean residential buildings. Extensive analytical work is reviewed here to assess the influence of building design and occupant envelope-controls on auxiliary space-conditioning energy. Results of simulations indicate that indoor comfort temperatures can be achieved all year long at low extra capital and without recourse to traditional space-heating and cooling. The methods applied here for central Chile outline guiding principles for designing naturally conditioned dwellings across the main inhabited region of the country.
5:10pm - 5:20pmShading Effect and Heat Reflection of the Green Façade: Measurements of an External Corridor Building in Munich, Germany
Hankun Lin1, Florian Musso2, Yiqiang Xiao1
1State Key Laboratory of Subtropical Building Science, South China University of Technology, China; 2Lehrstuhl für Baukonstruktion und Baustoffkunde, Technische Universität München, Germany
Risks of urban heat island (UHI) on the outdoor comfort and human health are rising in the trends of high-density urbanism. Green façade (GF) is one of the technologies which interested by researchers and architects because of the effects of the diminution on UHI, urban acoustic, and air pollution. This paper focuses on the shading effect of the GFs on the semi-outdoor thermal environment. A student dormitory with GFs is invited to investigate on a summer day in Munich, Germany. Through the measurements comparing the shaded and exposed area, results show that the Ave. and the Max. air temperatures (Temps) are decreased by 0.7℃ (W) and 2.1 ℃ (W), the Ave. surface Temp of the glazing is reduced by 1.2℃ (E), and which of the aluminium is reduced by 3.5℃ (W)in the shaded area. Results confirm the shading effect of the GFs and reveal the potential of the decreasing heat reflection on building façade to the surrounding environment.
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