English

This paper sums up a detailed (CFD) study of the flow around a Computer Simulated Person (CSP) in a displacement ventilated room. The requirements of several computational aspects such as convergence criteria and grid resolution needed for accurate CFD simulations of the personal micro-environment are identified.
Two RANS turbulence models predicted different behavior in both flow structures. But without experimental data the results could not be validated.

Health and comfort performance criteria for buildings have been defined. Then compliance with a set of measurable parameters related to indoor air pollutants or physical characteristics of the indoor environment is expected to assure, with a high degree of confidence, the provision of acceptable performance of buildings
Energy efficiency is evaluated too by means of the energy index ( the yearly total energy use per gross heated floor area), and the building is ranked accordingly.

A limited number of studies on the effectiveness of prevention and remediation of IAQ problems in homes were identified. This paper is a critical review of scientific literature on residential IAQ, ventilation and building-related health effects investigations.

The performance of the ventilation system in a large welding working place was evaluated for that study. The exposure to welding fumes may be dangerous for workers, to prevent that problem , jet fans were used based on concept of total space ventilation.
It was found that the welding fumes in occupied zone were not diluted efficiently when the ventilation system was not installed whereas their concentration was maintained below the regulation limiit with the jet fans,

In this paper the concentration of CO2 is taken as an index of personnel contamination and the concentration of TVOC as an index of building contamination, which meets the needs of energy saving and indoor air quality improvement through air conditioning fresh air random control.

The paper demonstrates the application of a new index that provides a practical and quantitative evaluation of building ventilation effectiveness. It allows the judging of the ventilation performance of a displacement ventilation system in a building complex, with the contaminant concentration data obtained from numerical experiments.

For that study, an underfloor ventilation system providing two different airflow patterns (short and long throw) was tested and compared with a mixing and displacement ventilation system in a mock-up of a typical office. The systems were operated under identical conditions.
The authors conclude that an underfloor ventilation system providing a short throw can ensure both a high air quality (comparable to displacement ventilation), while providing a low risk of thermal discomfort for occupants.

This investigation involves full-scale experiments with two breathing thermal manikins in a room ventilated by an air distribution system based on a textile terminal extended by a personalized ventilation system . The aim is to study the improved protection of people in a room..
It appears that the flow in the room is fully mixed with a limited protection of the occupants when the air is supplied from the textile terminal alone, .and the personalized ventilation improves the protection of occupants when the personal exposure index is increased.

Correlations between indoor ozone concentrations and the emission rates of oxygenated compounds are examined in this paper. Data collected in an occupied, low-polluting office at two different ventilation rates (1 h-1 and 3 h-1) with and without common indoor sources are re-analyzed reporting that with sources present the measured total emission rate was about 5% higher at the higher ventilation rate.
The results suggest that an increased outdoor-to-indoor transport of ozone gives larger emission rates of oxygenated compounds at larger ventilation rates.

Homes with natural ventilation is a predominant type of residential buildings in taiwan . As high microbial concentrations have been reported.in those buildings, the authors have studied the effects of ventilation efficiency on indoor/outdoor levels of airborne microbes in 44 homes with natural ventilation.
Indoor and outdoor airborne bacteria and fungi were collected and the air change rate (ACH) was measured by tracer gas concentration decay method.