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.

This paper deals with the integration of CFD analysis tool with genetic algorithms. This integrated process presents advantages in generating design alternatives that tally with multiple design, thermal and ventilation criteria.

Model experiments were conducted to know the airflow in a room equipped with a ceiling multi-cone diffuser A comparison between the results of CFD and the model experiments has been done.

The main objective of this paper is to describe methods for characterising air diffusers for CFD simulation of the room airflows. As a basis of work, a circular diffuser was used for working out and testing those methods.

In this paper the application of CFD simulation with unstructured fine elements system was carried out to obtain airflow data for the boundary conditions for an air flow.Tthe results were compared with the measured data.

Part 1 of this paper gives first an outline of the experiment (full-scale measurement of the air velocity carried under isothermal condition), then discusses the 2 modeling methods - the BOX method and the P.V. method - used for CFD simulation.The results of calculations with the 2 methods showed good agreement with the experimental data.

This method enables the determination of the influence of heating source characteristics on mean radiant temperature for composite room surfaces, as well as on thermal comfort and discomfort. A maximal possible thermal comfort area can be achieved with the determination of the best interactive influence between the building structure and its heating system.

The paper deals with the CFD analysis performed for a family house residence, which is in the design phase : the aim was to test several concepts for heating ( floor heating, floor convectors, both systems) in terms of thermal comfort.