The aim of this work was to develop a new calculation method of the zonal air velocity in ventilated room during the design stage. The verification showed a good correlation between the method and the experimental data.
When using RANS turbulence models the mean profiles of mixed convection can be predicted with accuracy. It is more important to resolve large scale 3D structures instead of using very complex turbulence models, for the prediction of room airflow with floor heating or cooled ceiling.
This study consisted first in a sampling campaign that has shown the important levels of NCL3 encountered in swimming pools. Then a simulation of the NCL3 dispersion was conducted wtih the following simulation tools : TRNSYS (thermal simulation) and FLUENT (CFD simulation).
This paper presents a numerical method aiming at recreating the concentration field of a pollutant at each point of a ventilated enclosure that contains one or several pollutant sources of unknown emission rate.
This paper deals with a 3D numerical study to assess the effectiveness of a displacement ventilation system to remove particulate pollutants, generated in the occupied zone of a room.
The methods for estimating or calculating the noise reduction in ductwork are described. Information is given about noise propagation in straight circular or rectangular ducts and in ducts with diameters changes, bends, elbows or junctions. Noise reduction by air diffusers, filters, coils, is also presented, as well as noise emission by ducts walls.
The article summarizes the results of three recent Danish studies showing that the improvement of air quality in offices increases productivity by 5% or more. It also mentions a recent Danish study about the annual benefit of improved air quality, which was found as being at least ten times higher than the increase in costs.
Ventilation strategies for multiunit residential buildings are described according to the results of a survey in 260 randomly selected buildings in Canada. Most buildings use corridor pressurization systems with an either central or apartment-based air exhaust. Some outdoor air is delivered to individual apartments, but in some cases, corridor air systems act as a ventilation system for individual apartments. Occupants complaints have been recorded, the main one being odor transfer between apartments.
This article presents the new requirements of the ANSI/ASHRAE standard 62-2001, Ventilation for Acceptable Indoor Air Quality, including recent changes of the standard available at the Ashrae web site. It explains the status of the 31 addenda to the 1999 version of the standard, some of them being included in the 2001 version, others being still in discussion or in the process to be adopted.
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