On-site environmental study for public residential buildings in Hong Kong

Pao Yue-kong Library Electronic Theses Database

On-site environmental study for public residential buildings in Hong Kong

 

Author: Tsang, Hon-wai
Title: On-site environmental study for public residential buildings in Hong Kong
Degree: M.Eng.
Year: 2011
Subject: Air flow -- Measurement.
Dwellings -- Heating and ventilation -- China -- Hong Kong.
Natural ventilation.
Building sites -- Environmental aspects.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: x, 95 leaves : ill. (some col.) ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2451598
URI: http://theses.lib.polyu.edu.hk/handle/200/6239
Abstract: Since the incidence of Severe Acute Respiratory Syndrome (SARS) outbreak among residential buildings in 2003 has raised public awareness regarding healthy and safe indoor environment, a challenge has been introduced to local engineers who have to balance between the maximum profit and the acceptable built environment for a development design. Based on the design requirements specified in the building ordinance and voluntary schemes, the utilization of natural resources especially air ventilation is encouraged even for enhancing comfort and reducing energy use. The Housing Authority of the Hong Kong SAR Government has adopted the Air Ventilation Assessment (AVA) as essential design considerations for all major development proposals from 2006. To serve this purpose, Computational Fluid Dynamic (CFD) simulations have become a common cost effective tool to optimize the design from different building configurations. However, the results may not be accurate before any validation. The simulation could be performed comprehensively to minimize the error. This study employed CFD simulation and on-site measurements to evaluate the built environment of a public housing estate under summer and winter typical weather conditions for finding the appropriate ways to achieve more comfort environment for local residents. It intends to improve the outdoor and indoor environmental conditions of the HA development in a high-density urban area. To improve the reliability of measurements, two sets of measurements were conducted in two consecutive months in each season. Not surprisingly, disagreements existed due to limitation of CFD simulations and uncertainty of measured results. Nevertheless, this study attempted to integrate the real data into the CFD simulation to refine the AVA. In this study, the simulation was remodeled to verify the original design and, with possible adjustment, to propose recommendations for future designs. The implementation of Air Ventilation Assessment system could help plan and control the wind environment in Hong Kong. Before it becomes mandatory, extensive testing and validation should be commenced to provide evidence and definitive benchmark standards. Although the effectiveness of the AVA for urban planning remains controvertible, the potential implementation of this practice involving innovative design would be worth further investigation.

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