Table of Contents
ISRN Mechanical Engineering
Volume 2011 (2011), Article ID 431014, 5 pages
Research Article

The Effect of a Vertical Vent on Single-Sided Displacement Ventilation

Department of Mechanical Engineering, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran

Received 27 March 2011; Accepted 28 April 2011

Academic Editor: A. Gelfgat

Copyright © 2011 Mostafa Rahimi and Iman Arianmehr. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Natural ventilation in buildings is an energy-saving and a preferable ventilation method. Under the buoyancy effect, single-sided mixed and displacement ventilation modes take place when air is ventilated through one or more openings, located on a vertical wall of an enclosure. Another method of natural ventilation occurs when air flows out through a vertical vent installed on the roof of an enclosure. In the present study, a combination of both the natural ventilation methods was examined. A test room of single-sided ventilation was equipped with a vertical vent. Ventilation rate through the openings was evaluated based on the air flow velocity measured at the surface area of the openings. The vertical vent was kept closed during the first run of the experiments, then the same experiments repeated where the vent was in use. Based on the experimental results, the effect of the vertical vent on the ventilation rate is clarified and a model on combination for two ventilation methods is suggested.