How to avoid or reduce the influence of suddenly released contaminant when emergency occurs ? A 3D Full scale room with displacement and mixing ventilation system is numerically studied assuming contaminant released at certain positions in the room. IACS is adopted as an index that can be applied to determine ventilation strategy with the aim of defending indoor environment against contamination.
For that study the measurement of parameters in the indoor environment were carried out with a simultaneous survey with questions dealing with elements of the indoor environment, health status and health problems. That study reveals a significant role for the psychological state and psychological factors of the respondents of natural ventilation when sujectively describing the indoor environment.
The web-based IEQ survey is a tool that helps assess how well a building is performing from the viewpoint of its occupants. It is useful to detect and solve problems, and to rate a building performance.The survey conducted in more than 70 buildings has been widely tested and refined.
Three case studies are presented, demonstrating the different possible applications of the survey : evaluation of the effectiveness of a technology, information of the guidelines for a new comfort standard, benchmarking facility performance.
That study provides data on compared outdoor and indoor concentration levels of ozone and nitrogen oxides in 8 school buildings in France. It also gives information on the parameters that influence the relationship between outdoor and indoor air quality (such as indoor humidity, indoor temperature, building occupancy, airthightness of the building envelope). Results and discussion are presented.
This paper gives the main results of a thesis whose main objective was the comparison of numerical and experimental values of indoor air quality. The tests were carried out at the CSTB . That thesis has permitted to propose an index for the appreciation of the efficiency of the elimination of pollutants.
For that study a mass balanced model is applied to determine area-specific emissions rates in office buildings. Sources of VOCs were identified, put into 3 broad categories and quantified : building materials (23.7 %), ventilation systems (39.0 %) and occupants and their activities (37.3 %) .
This paper sums up the results of a study on the internal partitioning with its effects on the room air quality along with the ventilation performance. Physical tests and numerical modeling for a CFD simulation were used to evaluate different test conditions that employed mixing ventilation from the ceiling.
It is not easy to provide simultaneously thermal comfort, proper air quality, efficient energy consumption to building occupants. In this paper an alternative methodology of real-time determination of optimal indoor air condition for HVAC system to achieve those 3 requirements is presented. A 24 hours operating HVAC system of a single-story building was chosen as a case study.The experiment results obtained with the proposed methodology were better than those from a conventional approach.
In this paper the authors present the results of the European AIRLESS programme whose aim was to identify the pollution sources in air-handling units, and then avoid or eliminate this pollution. The authors propose several energy efficient ways to provide good indoor air and efficient indoor environment conditioning.
The simulation of airflow pattern in an office building in Singapore is based on the environmental conditions and the corresponding ventilation parmeters measured on a typical day. The findings of that study are reported in this paper.
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