Simulation research on the performance of natural ventilation in buildings

Natural ventilation is the exchange air between a building and the environment by natural means such as the forces from the wind and temperature variations. Although the forces from the wind may appear as the dominant driving mechanism of natural ventilation, the effect of temperature differences sh...

Full description

Saved in:
Bibliographic Details
Main Author: Lew, Ruenn Shen
Other Authors: Li Hua
Format: Final Year Project
Language:English
Published: 2017
Subjects:
Online Access:http://hdl.handle.net/10356/71319
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-71319
record_format dspace
spelling sg-ntu-dr.10356-713192023-03-04T19:32:18Z Simulation research on the performance of natural ventilation in buildings Lew, Ruenn Shen Li Hua School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering Natural ventilation is the exchange air between a building and the environment by natural means such as the forces from the wind and temperature variations. Although the forces from the wind may appear as the dominant driving mechanism of natural ventilation, the effect of temperature differences should not be overlooked as directional buoyancy force greatly affect the air flow patterns inside the building [1]. Natural ventilation has been labelled as a “green” technology and has attracted great attentions because it reduces energy consumption and at the same time provides ventilation at an acceptable rate comparable to most of the mechanical ventilation strategies [2]. Tantasavasdi et al. studied the applicability natural ventilation strategies in houses located in a hot and humid climate region and concluded that a minimal indoor air velocity of 0.4ms-1 is essential for comfortable indoor environment [3]. The objective of this research is to simulate and analyse the effects of different placement of openings and incoming air velocity on the effectiveness of natural ventilation. The computational fluid dynamics (CFD) simulations are generated to obtain information on the indoor air parameters such as the pressure, velocity and temperature. The variables studied are the configurations of the placement of both the inlet and outlet pair and the incoming air velocity. The effectiveness of the natural ventilation strategies could be deduced qualitatively from results of contours and vectors in the CFD simulations. Based on the CFD simulations, it has been found that the most effective natural ventilation strategy is by placing the inlet at lower altitude compared to the outlet on walls opposite to each other across the building. The CFD simulations also indicate that the effectiveness of natural ventilation increases with increasing incoming air velocity. Nevertheless, extremely high velocity is not ideal because the level of comfort of the occupant in the building reduces due to fast moving air. The CFD simulations results could be utilised to generate an intuition ii among the readers on the pattern of indoor air flow due to the interaction of wind and temperature variations. Bachelor of Engineering (Mechanical Engineering) 2017-05-16T04:12:42Z 2017-05-16T04:12:42Z 2017 Final Year Project (FYP) http://hdl.handle.net/10356/71319 en Nanyang Technological University 76 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering
spellingShingle DRNTU::Engineering::Mechanical engineering
Lew, Ruenn Shen
Simulation research on the performance of natural ventilation in buildings
description Natural ventilation is the exchange air between a building and the environment by natural means such as the forces from the wind and temperature variations. Although the forces from the wind may appear as the dominant driving mechanism of natural ventilation, the effect of temperature differences should not be overlooked as directional buoyancy force greatly affect the air flow patterns inside the building [1]. Natural ventilation has been labelled as a “green” technology and has attracted great attentions because it reduces energy consumption and at the same time provides ventilation at an acceptable rate comparable to most of the mechanical ventilation strategies [2]. Tantasavasdi et al. studied the applicability natural ventilation strategies in houses located in a hot and humid climate region and concluded that a minimal indoor air velocity of 0.4ms-1 is essential for comfortable indoor environment [3]. The objective of this research is to simulate and analyse the effects of different placement of openings and incoming air velocity on the effectiveness of natural ventilation. The computational fluid dynamics (CFD) simulations are generated to obtain information on the indoor air parameters such as the pressure, velocity and temperature. The variables studied are the configurations of the placement of both the inlet and outlet pair and the incoming air velocity. The effectiveness of the natural ventilation strategies could be deduced qualitatively from results of contours and vectors in the CFD simulations. Based on the CFD simulations, it has been found that the most effective natural ventilation strategy is by placing the inlet at lower altitude compared to the outlet on walls opposite to each other across the building. The CFD simulations also indicate that the effectiveness of natural ventilation increases with increasing incoming air velocity. Nevertheless, extremely high velocity is not ideal because the level of comfort of the occupant in the building reduces due to fast moving air. The CFD simulations results could be utilised to generate an intuition ii among the readers on the pattern of indoor air flow due to the interaction of wind and temperature variations.
author2 Li Hua
author_facet Li Hua
Lew, Ruenn Shen
format Final Year Project
author Lew, Ruenn Shen
author_sort Lew, Ruenn Shen
title Simulation research on the performance of natural ventilation in buildings
title_short Simulation research on the performance of natural ventilation in buildings
title_full Simulation research on the performance of natural ventilation in buildings
title_fullStr Simulation research on the performance of natural ventilation in buildings
title_full_unstemmed Simulation research on the performance of natural ventilation in buildings
title_sort simulation research on the performance of natural ventilation in buildings
publishDate 2017
url http://hdl.handle.net/10356/71319
_version_ 1759855951841591296