Development of Water and Energy Balance Model with Method to Identify Parameters for Green Roof
Date Issued
2012
Date
2012
Author(s)
Chiew, Jing-Yi
Abstract
Over the years, the restriction of energy supply has increased to a great amount. Under the impact of the extreme weather, water shortage and the flood happened in those areas with insufficient drainage system have become more and more serious. This situation may likely be deteriorated by future climate change. However, since high uncertainty still remains in the impact assessment; centralized systems may not be effective and flexible solutions. Therefore, distributed small systems are needed for reducing the energy demand, water shortage, and floods. Green roof has been on the top of the efficiency list as one of the best solution for energy and water problems. It has being developed and used all over western atmosphere, including the United States and Europe for more than a decade. Compared to those countries, Taiwan’s research to model green roof is very limited. Therefore the purpose of this research is to develop a physical based energy and water balance models with methods to identify parameters for green roof. Besides, an experiment is designed to verify the model. The experiment results showed that our green roof can delay the peak flow to approximately 50 minutes. Besides, the green roof has less of a variance on the temperature. The simulation results show that the value of coefficient of efficiency for runoff, percolation, and total drainage are 0.69, 0.58 and 0.61. The causes of the errors are most likely coming from clogging in the experimental box pipe, and raw data’s instability. The bottom of the green roof has better energy balance simulation, which may have less effects caused by the heat conduction from the experimental box. The verification study indicates the simulation results are significantly influenced by the parameters of curve number, U*, and α. The proposed models in this study can adequately simulate water and energy for green roof. Thus, the models and methods to determine values of parameters can be applied to future researches. It’s suggested to combine the results of this study with the analysis of indoor temperature adjustment to see the performance of green roof on reducing the energy consumption in future. Furthermore, it can also apply to integrate with LID and rain harvesting system.
Subjects
Green Roof
Energy Balance Model
Water Balance Model
Experiment Design
Local Parameters
Type
thesis
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