Renewable energy solutions for the built environment in dense urban cities

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Renewable energy solutions for the built environment in dense urban cities

 

Author: Ip, Ka-yan
Title: Renewable energy solutions for the built environment in dense urban cities
Degree: M.Eng.
Year: 2007
Subject: Hong Kong Polytechnic University -- Dissertations.
Renewable energy sources -- China -- Hong Kong.
Solar energy -- China -- Hong Kong.
Department: Dept. of Building Services Engineering
Pages: xi, 143 leaves : ill. (some col.), col. maps ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2117573
URI: http://theses.lib.polyu.edu.hk/handle/200/2938
Abstract: With the urgent demand of renewable energy and the rising number of urban cities nowadays, the renewable energy solutions for the built environment is an emergent issue for our future, especially for the urban city - Hong Kong, which is the third dense city in the world [7]. This paper analyzes the applications of renewable energy in Hong Kong and investigates the applicability of integration of wind energy into buildings. This paper introduces and analyzes the applications of solar energy, geothermal energy and wind energy. In Hong Kong, solar and wind energy applications are own large potential market while geothermal energy application is not feasible. The integration of wind energy into buildings is a new trend nowadays. Hong Kong owns good wind conditions and application of the Building Augmented Wind Turbine (BAWT) is suitable for Hong Kong. Therefore, this paper investigates the application and the integration of wind energy in buildings. Computational Fluid Dynamics (CFD) is used to find out the wind speed and wind flow over the buildings which are related to the wind power. FLUENT is utilized to investigate the wind flows over buildings. The simulations with three scenarios are demonstrated in the present study to evaluate the influence of building distance, building height and roof shapes for the wind flow and wind speed. Recommendations are given for applying wind turbines in different conditions based on the findings. The simulation results give that wind speeds vary with the building distances. The two buildings with shorter building distance results in higher value of the wind speed. Double building distance (10m to 20m) would be able to increase the velocity from 14.8ms-1 to 15.6ms-1. The second influencing factor is the building height, which might affect the position of maximum velocity occurrence. The findings imply that higher elevation is more advantageous between tall buildings. Therefore, the optimal locations for installing wind turbines are affected by different building heights. The third factor that affects the wind speed and wind flow is the roof shape, which also affects the turbulence occurrence. This implication allows us to integrate the innovative roof design for new building to enhance the wind power.

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