Two-sided windcatcher in low wind speed environment

Global warming is a major threat and is mainly caused by emission of greenhouse gases. The building construction sector or buildings are accountable for about 40% of total greenhouse gases due to energy consumption. The application of air conditioning systems is reported to reach 70% of this energy...

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Main Author:	Nejat, Payam
Format:	Thesis
Language:	English
Published:	2018
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/86853/1/PayamNejatPSKA2018.pdf
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id	my-utm-ep.86853
record_format	uketd_dc
spelling	my-utm-ep.868532020-09-30T09:08:54Z Two-sided windcatcher in low wind speed environment 2018 Nejat, Payam TA Engineering (General). Civil engineering (General) Global warming is a major threat and is mainly caused by emission of greenhouse gases. The building construction sector or buildings are accountable for about 40% of total greenhouse gases due to energy consumption. The application of air conditioning systems is reported to reach 70% of this energy consumption. In contrast, natural ventilation systems such as windcatcher are a promising passive cooling alternative that not only improve indoor air quality (IAQ) and thermal comfort but also reduce energy consumption. However, the efficiency of windcatcher is hindered by two factors: air short-circuit phenomenon and low ambient wind speed. The aim of this research is to develop a new windcatcher design that addresses both problems by integration of wing wall and installation of a new device called anti-short circuit device (ASCD). Based on review of literature, wing wall and ASCD can enhance the performance of windcatcher in low wind speed. To achieve this aim, two methods namely wind tunnel testing and simulation using computational fluid dynamics (CFD) were explored. The results showed that the difference between the CFD and experimental results was within the acceptable range. Integration of wing wall and ASCD to the windcatcher improved the IAQ factors such as air flow rate, air change rate and air velocity. It was observed that the ventilation performance of the new design in 45o wind incident angle was better than the 0o wind incident angle. In conclusion, this study has proven that the new design can effectively be implemented to improve the ventilation and IAQ. 2018 Thesis http://eprints.utm.my/id/eprint/86853/ http://eprints.utm.my/id/eprint/86853/1/PayamNejatPSKA2018.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:134236 phd doctoral Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Nejat, Payam Two-sided windcatcher in low wind speed environment
description	Global warming is a major threat and is mainly caused by emission of greenhouse gases. The building construction sector or buildings are accountable for about 40% of total greenhouse gases due to energy consumption. The application of air conditioning systems is reported to reach 70% of this energy consumption. In contrast, natural ventilation systems such as windcatcher are a promising passive cooling alternative that not only improve indoor air quality (IAQ) and thermal comfort but also reduce energy consumption. However, the efficiency of windcatcher is hindered by two factors: air short-circuit phenomenon and low ambient wind speed. The aim of this research is to develop a new windcatcher design that addresses both problems by integration of wing wall and installation of a new device called anti-short circuit device (ASCD). Based on review of literature, wing wall and ASCD can enhance the performance of windcatcher in low wind speed. To achieve this aim, two methods namely wind tunnel testing and simulation using computational fluid dynamics (CFD) were explored. The results showed that the difference between the CFD and experimental results was within the acceptable range. Integration of wing wall and ASCD to the windcatcher improved the IAQ factors such as air flow rate, air change rate and air velocity. It was observed that the ventilation performance of the new design in 45o wind incident angle was better than the 0o wind incident angle. In conclusion, this study has proven that the new design can effectively be implemented to improve the ventilation and IAQ.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Nejat, Payam
author_facet	Nejat, Payam
author_sort	Nejat, Payam
title	Two-sided windcatcher in low wind speed environment
title_short	Two-sided windcatcher in low wind speed environment
title_full	Two-sided windcatcher in low wind speed environment
title_fullStr	Two-sided windcatcher in low wind speed environment
title_full_unstemmed	Two-sided windcatcher in low wind speed environment
title_sort	two-sided windcatcher in low wind speed environment
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2018
url	http://eprints.utm.my/id/eprint/86853/1/PayamNejatPSKA2018.pdf
_version_	1747818512699621376

Two-sided windcatcher in low wind speed environment

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