Experimental measurements and CFD simulations were carried out to study the contaminant dispersion in a ventilated room with an area source release. A displacement ventilation system and three mixing ventilation systems using a grille, square, and slot diffuser were used. A model was validated to study the effects of airflow and the area source location on the dispersion of the contaminants. The simulation results have been compared to the experimental data, the conclusion are presented.

This paper presents an experimental study with numerical predictions of airflow and temperature characteristics. It was conducted in a full size experimental room with different supply jet conditions, heat densities and air distribution methods including the FR (floor return) and the TR (top return) air distribution configuration.

The aim of this paper was to study the effect of duct cleaning on the perceived air quality. Duct cleaning was carried out in 10 non-problem Finnish office buildings between 1997 and 2000. Before and after the cleaning, concentrations of particle mass, viable fungal spores and bacteria, TVOC and CO2 were measured in outdoor, indoor and supply air every 6 months. In parallel, a questionnaire about their feeling, was distributed to employees before and after the cleaning.

This paper considers regulations and standards and compare them about their requirements in ventilation flow rates and IAQ. They can be a helpful tool to handle these requirements and to create buildings with a quality level which satisfies the needs of the users
Scandinavian countries are quite similar in respect of culture, building tradition, climate and so on. So, the difference in ventilation requirements between them should be expected to be small but the results of their comparison show a wide difference.

Few studies have addressed the issue of how to make improvements to avoid Taiwanese housewives exposing to excessive quantities of air pollutants when cooking. This study investigated the design and experimental assessment of side exhaust systems in afull-scale model kitchen including exhaust equipment and the measuring apparatus. The aim was to understand how different exhaust configurations could affect the overall exhaust performance.

A well adjusted ventilation is useful to save heating energy with regard to hygienic aspects or aspects of building materials maintenance.For that study, a simple device was developed with the VVGD, it aims at helping housing users to perform a sensible ventilation behavior based on reliable sensor data. During the field test, a total of 35 VVGDs were installed with 19 test users.The sensors output their signals to a display unit similar to a traffic light.

In this emergency ventilation investigation, the aim of ventilation is to minimize the influence of contaminative gas upon the occupants.A two-dimensional Cellular Automata model is used to calculate the occupants developing distribution during an emergency event. With the numerical simulation tool, the negative influence on every person has been calculated.

Tracer gases and its monitoring method were studied in measurement of ventilation rate by use ofconcentration-decay method. Five kinds of gases (sulfur hexafluoride, nitrous oxide, carbon monoxide, carbon dioxide and isobutene) were compared.In this study isobutene was used as law-environmental-loading tracer gas. Its concentration was monitored with a PID (photo-ionizing detector) monitor.To fix the procedures and conditions for measurement of ventilation rate, the performance characteristics of this system were examined.

In this paper, applied the SARS particle thresholds, the distribution of SARS virus particles in rooms with three different ventilation types and two different virus source locations are compared. And the SARS particle concentration near the sickroom is simulated numerically with two different positions of the exhaust chimney.The conclusions that have been drawn can be used to design the ventilation system of the SARS sickroom for protection.

This paper investigates the feasibility of reducing the outdoor air ventilation requirements by selectinglow-emission materials, while still maintaining acceptable IAQ, for a residential building. The method used was to apply tools such as a computerized database of material emissions and its accompanying IAQ simulation model (MEDB-IAQ).A real two-storey R-2000 house was chosen as the simulation reference case to serve as the basis for comparisons with alternative material selections.