Biomimetics for passive air conditioned design for buildings in the hot arid regions

The high energy consumption for air conditioning in buildings is a serious concern due to its consequences on the earth's ecological life. In nature, animals regulate their body temperature in extreme environments without prejudice to the environmental system. Therefore, this study aims to desi...

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Main Author:	Alsharafi, Amatalraof Abdullah Abdulwahed
Format:	Thesis
Language:	English
Published:	2019
Subjects:	TH Building construction
Online Access:	http://eprints.utm.my/id/eprint/81862/1/AmatalraofAbdullahPFAB2019.pdf
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id	my-utm-ep.81862
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spelling	my-utm-ep.818622019-09-29T10:54:07Z Biomimetics for passive air conditioned design for buildings in the hot arid regions 2019-01 Alsharafi, Amatalraof Abdullah Abdulwahed TH Building construction The high energy consumption for air conditioning in buildings is a serious concern due to its consequences on the earth's ecological life. In nature, animals regulate their body temperature in extreme environments without prejudice to the environmental system. Therefore, this study aims to design a passive cooling unit for buildings in the hot arid regions by emulating biological cooling strategies in nature. It adopted a biomimetic exploratory method to determine three of the efficient biological cooling strategies in nature based on the morphological attributes. These are; cooling through animals’ respiratory passages, thermal radiators and airflow cooling in termite mound. A comparative study was conducted on four case studies under each of the three cooling strategies to come up with the working principles that can be used as a guide to design a biomimetic cooling system. One of these strategies, the camel nasal respiratory cooling was simulated to design a cooling unit installed in wind towers for buildings. To validate the applicability of the camel nasal-inspired cooling design, experimental tests have been conducted in both wind tower and wind tunnel in a desert city, Seiyun in Yemen. The study main parameter was the design cooling efficiency for (i) three materials: clay, clay with jute fiber, and clay with wood wool pads, (ii) design height, and (iii) climatic environmental variables. The results showed that the best cooling efficiency among the three materials was the design of clay with jute fiber 85.2 %, followed by clay with wood wool pads 76.6 %, and clay 66.3 %. The former two designs have effectively dropped the temperature in hot arid climate up to 18.9 °C for jute design and 16.5 °C for wood wool design. This indicates that the bio-inspired design can replace the mechanical air conditioning system. Additionally, the cooling efficiency of the design increases by the increment of its height and the ambient temperature. However, it decreases with the increment of the inlet air wet-bulb temperature, air humidity, and air velocity. Thus, it can be concluded that emulating biological thermo-regulatory strategies is useful for the design of energy-efficient cooling systems. This study contributes to possible passive cooling design for buildings in the hot arid regions. 2019-01 Thesis http://eprints.utm.my/id/eprint/81862/ http://eprints.utm.my/id/eprint/81862/1/AmatalraofAbdullahPFAB2019.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:126475 phd doctoral Universiti Teknologi Malaysia, Faculty of Built Environment Faculty of Built Environment
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TH Building construction
spellingShingle	TH Building construction Alsharafi, Amatalraof Abdullah Abdulwahed Biomimetics for passive air conditioned design for buildings in the hot arid regions
description	The high energy consumption for air conditioning in buildings is a serious concern due to its consequences on the earth's ecological life. In nature, animals regulate their body temperature in extreme environments without prejudice to the environmental system. Therefore, this study aims to design a passive cooling unit for buildings in the hot arid regions by emulating biological cooling strategies in nature. It adopted a biomimetic exploratory method to determine three of the efficient biological cooling strategies in nature based on the morphological attributes. These are; cooling through animals’ respiratory passages, thermal radiators and airflow cooling in termite mound. A comparative study was conducted on four case studies under each of the three cooling strategies to come up with the working principles that can be used as a guide to design a biomimetic cooling system. One of these strategies, the camel nasal respiratory cooling was simulated to design a cooling unit installed in wind towers for buildings. To validate the applicability of the camel nasal-inspired cooling design, experimental tests have been conducted in both wind tower and wind tunnel in a desert city, Seiyun in Yemen. The study main parameter was the design cooling efficiency for (i) three materials: clay, clay with jute fiber, and clay with wood wool pads, (ii) design height, and (iii) climatic environmental variables. The results showed that the best cooling efficiency among the three materials was the design of clay with jute fiber 85.2 %, followed by clay with wood wool pads 76.6 %, and clay 66.3 %. The former two designs have effectively dropped the temperature in hot arid climate up to 18.9 °C for jute design and 16.5 °C for wood wool design. This indicates that the bio-inspired design can replace the mechanical air conditioning system. Additionally, the cooling efficiency of the design increases by the increment of its height and the ambient temperature. However, it decreases with the increment of the inlet air wet-bulb temperature, air humidity, and air velocity. Thus, it can be concluded that emulating biological thermo-regulatory strategies is useful for the design of energy-efficient cooling systems. This study contributes to possible passive cooling design for buildings in the hot arid regions.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Alsharafi, Amatalraof Abdullah Abdulwahed
author_facet	Alsharafi, Amatalraof Abdullah Abdulwahed
author_sort	Alsharafi, Amatalraof Abdullah Abdulwahed
title	Biomimetics for passive air conditioned design for buildings in the hot arid regions
title_short	Biomimetics for passive air conditioned design for buildings in the hot arid regions
title_full	Biomimetics for passive air conditioned design for buildings in the hot arid regions
title_fullStr	Biomimetics for passive air conditioned design for buildings in the hot arid regions
title_full_unstemmed	Biomimetics for passive air conditioned design for buildings in the hot arid regions
title_sort	biomimetics for passive air conditioned design for buildings in the hot arid regions
granting_institution	Universiti Teknologi Malaysia, Faculty of Built Environment
granting_department	Faculty of Built Environment
publishDate	2019
url	http://eprints.utm.my/id/eprint/81862/1/AmatalraofAbdullahPFAB2019.pdf
_version_	1747818419913228288

Biomimetics for passive air conditioned design for buildings in the hot arid regions

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