Thesis
Analysis of the impact of green walls on urban dwellings in Bangladesh
Washington State University
Master of Science (MS), Washington State University
05/2016
Handle:
https://hdl.handle.net/2376/102319
Abstract
With enhanced rate of urbanization and the predicted increase in temperature due to global warming, it is anticipated that urban microclimates would deteriorate in future. Hence, for sustainable urbanization, there is an urgent need for mitigating the urban heat island and conservation of energy required for cooling and ventilation. Although a number of studies on green walls in the developed countries have positively asserted their role in mitigating urban heat island, there is a general lack of such studies in the developing countries of the world that receive high solar radiation. This study, conducted on Bangladesh, is an attempt in that direction. The possible impacts of green walls on energy savings during the summer was analyzed by using three analytical methods based on the estimation of evapotranspiration. The impact of the green walls on cooling was analyzed by two approaches: temperature based assessment and energy based assessment. The temperature based assessments by interpolation of an earlier study show that the decrease in temperature in Dhaka city due to green façade would be approximately 40 C. Similarly, cooling load is also expected to decrease by 40%. Analysis of energy savings by computation of CDD shows that if the ambient temperature decreases by 40 C, then the saving would be 44%. The energy based assessments based on 'CropWat' model show that the energy savings during the summer months would be about 31% of the total energy consumption or about 100% of the energy consumption required for cooling and ventilation. Analysis of thermal comfort by computation of THI value shows that at present the comfort condition is 'uncomfortable' for 100% of the people. But, by introducing green façade, the computed THI indicates that thermal condition can be made comfortable for 50% to 100% of the people, depending upon the decrease in temperature by 20 C and 40 C, respectively. The lowering of the energy demand by green façade due to increase in temperatures due to climate change in 2020 and 2050 would be similar to what may be applicable at present.
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Details
- Title
- Analysis of the impact of green walls on urban dwellings in Bangladesh
- Creators
- Samia Saleh
- Contributors
- Jolie B Kaytes (Chair) - Washington State University, Design and Construction, School ofDavid Wang (Committee Member) - Washington State University, Design and Construction, School ofMichael Anthony Sanchez (Committee Member) - Washington State University, Design and Construction, School of
- Awarding Institution
- Washington State University
- Academic Unit
- Design and Construction, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Number of pages
- 107
- Identifiers
- 99900524804401842
- Language
- English
- Resource Type
- Thesis