Indoor and Built Environment

 

Advanced Search

Journal Navigation

Journal Home

Subscriptions

Archive

Contact Us

Table of Contents

Click here for free access to the SAGE eReference platform!

Sign In to gain access to subscriptions and/or personal tools.
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to Saved Citations
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Request Reprints
Right arrow Add to My Marked Citations
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Sekhar, S.C.
Right arrow Articles by Lee, S.E.
Right arrow Search for Related Content
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati  
What's this?
Indoor and Built Environment, Vol. 5, No. 2, 99-105 (1996)
DOI: 10.1177/1420326X9600500205

Air Exchange Efficiency of a Ventilation System - a Case Study

S.C. Sekhar

School of Building and Estate Management, National University of Singapore, Singapore

K.W. Tham

School of Building and Estate Management, National University of Singapore, Singapore

S.E. Lee

School of Building and Estate Management, National University of Singapore, Singapore

The problems associated with poor indoor air quality may in most cases be attributed to poorly designed and poorly performing ventilation systems. The problems in a mechanically air-conditioned building are compounded if the building is fairly air tight and depends on fresh air provision at the central fresh air intake in the air handling unit (AHU). The performance of such a ventilation system not only depends on the quantity of fresh air provided at the fresh air intake but the manner in which this air is distributed around the various zones in the building. The ventilation performance, characterised by the space air distribution, may be dictated by either the initial design and commissioning of the different components of the air-conditioning system, such as the AHU, ducts, diffusers, etc. or subsequent changes in the office space layout and furnishing. This paper deals with the determination of some key ventilation parameters such as the air change rate, the age of air and the air exchange efficiency, all of which lead to an insight into the performance of the ventilation system. The approach is case-study-based and the methodology involves tracer gas analysis employing the concentration decay method as a means of determining the key parameters.

Key Words: Ventilation • Tracer gas analysis • Air change rate • Air exchange efficiency


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati    What's this?