indoor air quality

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.

Full-scale laboratory measurements combined with numerical simulations were undertaken to evaluate CFD capability to predict the pesticide dispersion in a naturally ventilated building. CFD successfully reproduced the trends but overestimates the mixing inside the building.

CFD is a suitable tool to calculate concentration in particle contaminant distribution in a room. 3 approaches are described for two types of flow problems and compared in this paper.

This study presents a model to predict the time required by a pollutant to disperse in a room, due to the effects of room occupancy (a moving person enhances the mixing of pollutants).

This paper presents a universal but simple mathematic model very useful to predict Volatile Organic Concentration in the bulk air for different conditions in residential buildings.

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.

Flow, temperature field and contaminant concentration distributions are analyzed using CFD for 5 different ventilation systems.

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.

This work concerns turbulence levels in a practical operating theatre of a 1200 beds Egyptian modern teaching hospital. The turbulence characteristics were represented by a modified k - epsilon model. Then a series of experimental investigations were preformed in the operating room to investigate the flow and temperature patterns and to assess the validity of the numerical model to be used.

This paper deals with experiments made to test the performance of a personalised ventilation system (PVS). 30 human subjects have participated to the experiment in an office with 6 work stations equipped with a PVS supplying outdoor air.The perception of air quality and the thermal sensation for each participant has been reportedduring their exposure to combinations of 3 levels of personalized air temperature, 4 airflow rates and 3 levels of room air temperature.