Investigation and characterization of cross ventilating flows through openings in a school classroom

Most Thai state schools use cross flow natural ventilation as a passive cooling system. Information on how window openings are able to provide good ventilation and comfort simultaneously is of great importance. The aim of this study is to investigate cross ventilating flows through the openings of a...

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Main Authors: Nitatwichit C., Khunatorn Y., Tippayawong N.
Format: Article
Language:English
Published: 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-47049104797&partnerID=40&md5=26d60f814b1d20e04dd2054a408a0c9e
http://cmuir.cmu.ac.th/handle/6653943832/1397
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Institution: Chiang Mai University
Language: English
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spelling th-cmuir.6653943832-13972014-08-29T09:29:15Z Investigation and characterization of cross ventilating flows through openings in a school classroom Nitatwichit C. Khunatorn Y. Tippayawong N. Most Thai state schools use cross flow natural ventilation as a passive cooling system. Information on how window openings are able to provide good ventilation and comfort simultaneously is of great importance. The aim of this study is to investigate cross ventilating flows through the openings of a typical Thai state school classroom. Computational fluid dynamics technique was used as a tool in this simulation. The opening discharge coefficients of six different type windows and a door were determined. Wind, stack and combined effects through the openings were characterized and compared for a range of different wind speeds and surface wall temperatures. Results showed that sliding windows gave the highest Cd value among openings considered by stack effect. Casement and side hung (90°) windows appeared to provide high air exchange rates. Their discharge coefficients ranged between 0.63 and 0.83. As far as combined effects are concerned, buoyancy was found to be significant at low wind speed (0.25 m/s). Acceptable indoor airflow patterns and thermal distributions can be expected in the occupied zone. The findings from this investigation are useful to develop a plan for a natural ventilation strategy of classrooms to enhance thermal comfort levels. 2014-08-29T09:29:15Z 2014-08-29T09:29:15Z 2008 Article 02533839 JCIEE http://www.scopus.com/inward/record.url?eid=2-s2.0-47049104797&partnerID=40&md5=26d60f814b1d20e04dd2054a408a0c9e http://cmuir.cmu.ac.th/handle/6653943832/1397 English
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
language English
description Most Thai state schools use cross flow natural ventilation as a passive cooling system. Information on how window openings are able to provide good ventilation and comfort simultaneously is of great importance. The aim of this study is to investigate cross ventilating flows through the openings of a typical Thai state school classroom. Computational fluid dynamics technique was used as a tool in this simulation. The opening discharge coefficients of six different type windows and a door were determined. Wind, stack and combined effects through the openings were characterized and compared for a range of different wind speeds and surface wall temperatures. Results showed that sliding windows gave the highest Cd value among openings considered by stack effect. Casement and side hung (90°) windows appeared to provide high air exchange rates. Their discharge coefficients ranged between 0.63 and 0.83. As far as combined effects are concerned, buoyancy was found to be significant at low wind speed (0.25 m/s). Acceptable indoor airflow patterns and thermal distributions can be expected in the occupied zone. The findings from this investigation are useful to develop a plan for a natural ventilation strategy of classrooms to enhance thermal comfort levels.
format Article
author Nitatwichit C.
Khunatorn Y.
Tippayawong N.
spellingShingle Nitatwichit C.
Khunatorn Y.
Tippayawong N.
Investigation and characterization of cross ventilating flows through openings in a school classroom
author_facet Nitatwichit C.
Khunatorn Y.
Tippayawong N.
author_sort Nitatwichit C.
title Investigation and characterization of cross ventilating flows through openings in a school classroom
title_short Investigation and characterization of cross ventilating flows through openings in a school classroom
title_full Investigation and characterization of cross ventilating flows through openings in a school classroom
title_fullStr Investigation and characterization of cross ventilating flows through openings in a school classroom
title_full_unstemmed Investigation and characterization of cross ventilating flows through openings in a school classroom
title_sort investigation and characterization of cross ventilating flows through openings in a school classroom
publishDate 2014
url http://www.scopus.com/inward/record.url?eid=2-s2.0-47049104797&partnerID=40&md5=26d60f814b1d20e04dd2054a408a0c9e
http://cmuir.cmu.ac.th/handle/6653943832/1397
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