Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors

Ventilation systems play a significant role in maintaining the indoor thermal and hygric balance. Nevertheless, the systems had been implicated to result in many problems. In the tropical climate, especially for energy efficiency purposes, building spaces are operated with differential ventilation....

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Main Authors:	Ali, Maisarah, Oladokun, Majeed, Osman, Samsul Bahrin, Samsuddin, Niza, Hamzah, Hairul Aini
Format:	Conference or Workshop Item
Language:	English English
Published:	EDP Sciences 2016
Subjects:	TH7005 Heating and ventilation
Online Access:	http://irep.iium.edu.my/51045/ http://irep.iium.edu.my/51045/ http://irep.iium.edu.my/51045/ http://irep.iium.edu.my/51045/14/51045-up-date.pdf http://irep.iium.edu.my/51045/17/51045_Moisture%20condensation%20on%20building_scopus.pdf

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recordtype	eprints
spelling	iium-510452017-10-12T03:22:28Z http://irep.iium.edu.my/51045/ Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors Ali, Maisarah Oladokun, Majeed Osman, Samsul Bahrin Samsuddin, Niza Hamzah, Hairul Aini TH7005 Heating and ventilation Ventilation systems play a significant role in maintaining the indoor thermal and hygric balance. Nevertheless, the systems had been implicated to result in many problems. In the tropical climate, especially for energy efficiency purposes, building spaces are operated with differential ventilation. Such spaces operate on 24-hrs basis, some on 8-hrs while others are either naturally ventilated or served with mechanical supply-exhaust fan systems with non-conditioned outdoor air. This practice had been found to result in condensation problems. This study involves a quantitative appraisal of the effect of operative conditions and hygrothermal quality of building envelopes on condensation risk. The in-situ experiment is combined with an analytical approach to assessing the hygrothermal quality of building envelopes in a tropical climate building under differential ventilation between adjacent spaces. The case-studied building is with a known history of condensation and associated damages including mould growth. The microclimate measurement and hygrothermal performance of the wall and floor against condensation and mould growth risks had been previously reported elsewhere. As a step further, the present study evaluates the effects of various envelope insulation types and configurations together with the HVAC cooling set-points on envelope hygrothermal performance. The results revealed that overcooling the air-conditioned side increases condensation risk on the non-air-conditioned side of the envelopes. The envelopes failed criteria for surface condensation at existing operative conditions irrespective of envelope hygrothermal quality improvements. However, the envelope performed well at improved cooling operative conditions even at existing envelope hygrothermal quality. It is, therefore, important to ascertain the envelope hygrothermal quality as well the cooling operative conditions while embarking on energy efficiency operations in mechanical ventilation systems under differential ventilation. EDP Sciences 2016-03 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/51045/14/51045-up-date.pdf application/pdf en http://irep.iium.edu.my/51045/17/51045_Moisture%20condensation%20on%20building_scopus.pdf Ali, Maisarah and Oladokun, Majeed and Osman, Samsul Bahrin and Samsuddin, Niza and Hamzah, Hairul Aini (2016) Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors. In: The 4th International Building Control Conference 2016 (IBCC 2016), 7th-8th March 2016, Kuala Lumpur. http://www.matec-conferences.org/articles/matecconf/pdf/2016/29/matecconf_ibcc2016_00089.pdf 10.1051/matecconf/20166600089
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	TH7005 Heating and ventilation
spellingShingle	TH7005 Heating and ventilation Ali, Maisarah Oladokun, Majeed Osman, Samsul Bahrin Samsuddin, Niza Hamzah, Hairul Aini Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors
description	Ventilation systems play a significant role in maintaining the indoor thermal and hygric balance. Nevertheless, the systems had been implicated to result in many problems. In the tropical climate, especially for energy efficiency purposes, building spaces are operated with differential ventilation. Such spaces operate on 24-hrs basis, some on 8-hrs while others are either naturally ventilated or served with mechanical supply-exhaust fan systems with non-conditioned outdoor air. This practice had been found to result in condensation problems. This study involves a quantitative appraisal of the effect of operative conditions and hygrothermal quality of building envelopes on condensation risk. The in-situ experiment is combined with an analytical approach to assessing the hygrothermal quality of building envelopes in a tropical climate building under differential ventilation between adjacent spaces. The case-studied building is with a known history of condensation and associated damages including mould growth. The microclimate measurement and hygrothermal performance of the wall and floor against condensation and mould growth risks had been previously reported elsewhere. As a step further, the present study evaluates the effects of various envelope insulation types and configurations together with the HVAC cooling set-points on envelope hygrothermal performance. The results revealed that overcooling the air-conditioned side increases condensation risk on the non-air-conditioned side of the envelopes. The envelopes failed criteria for surface condensation at existing operative conditions irrespective of envelope hygrothermal quality improvements. However, the envelope performed well at improved cooling operative conditions even at existing envelope hygrothermal quality. It is, therefore, important to ascertain the envelope hygrothermal quality as well the cooling operative conditions while embarking on energy efficiency operations in mechanical ventilation systems under differential ventilation.
format	Conference or Workshop Item
author	Ali, Maisarah Oladokun, Majeed Osman, Samsul Bahrin Samsuddin, Niza Hamzah, Hairul Aini
author_facet	Ali, Maisarah Oladokun, Majeed Osman, Samsul Bahrin Samsuddin, Niza Hamzah, Hairul Aini
author_sort	Ali, Maisarah
title	Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors
title_short	Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors
title_full	Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors
title_fullStr	Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors
title_full_unstemmed	Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors
title_sort	moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors
publisher	EDP Sciences
publishDate	2016
url	http://irep.iium.edu.my/51045/ http://irep.iium.edu.my/51045/ http://irep.iium.edu.my/51045/ http://irep.iium.edu.my/51045/14/51045-up-date.pdf http://irep.iium.edu.my/51045/17/51045_Moisture%20condensation%20on%20building_scopus.pdf
first_indexed	2023-09-18T21:12:13Z
last_indexed	2023-09-18T21:12:13Z
_version_	1777411328058589184

Moisture condensation on building envelopes in differential ventilated spaces in the tropics: quantitative assessment of influencing factors

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