This paper uses a CFD tool to study indoor air quality in a typical chemical laboratory. The research explores the performance of ceiling-supply mixing ventilation systems and side-wall-supply displacement ventilation with their effects on hood containment.The results of the two systems are presented.

The FANROOMLESS ventilation system for underground parking lot presents several unique characteristics. First, this system can reduce initial construction cost and uses the spaces moreeffectively by optimization of the ventilation facilities. Second, fan noise during operations can be reduced to under 65 dB(A). This study also presents the required exhaust rate (m3/hm2) to maintain acceptable CO level of25 ppm in accordance with the code. The data can help to calculate the required exhaust rate.

The purpose of the research at the first stage was to find out whether the new ventilation mode - stratum ventilation - is feasible. The system uses a large supply inlets located at the side of a room. A case study, a typical office in Hong Kong is used to illustrate that new mode.

The indoor thermal environment and energy consumption of large spaces with sidewall openings and top openings has been investigated for that study. A numerical simulation and site measurements were carried out. The results of the comparison of the two openings give the top openings superior for the airflow distribution and the improvement of IAQ.

In this paper, the vertical and horizontal spreading rates of CJV (confluent jet ventilation) over the floor are investigated using CFD (Computational Fluid Dynamics) simulations. They are compared with the spreading rates of the wall displacement ventilation (DV) system. The authors conclude that the wall confluent jet is able to cool a room with a heat load, a displacement system is not able to cope with.

In this paper a new method for ventilation measurement using an OP-FTIR (Open Path Fourier Tansform Infrared Spectroscopy) is proposed. A feasibility study was carried out and compared with the traditional measurement method using a Photoacoustic Gas Monitor. It appears that the new measuring method is feasible for practice.

The aim of this research was to acquire a method to select the optimal gas range hood through the performance test under KS (Korean standards) or pr EN (european) codes. Performance curve, noise level, capture efficiency and power consumption are analyzed.
General hoods and functional hoods are compared too.

The laboratory environment may generate harmful chemical gases, vapors, particulates and biological agents, those substances must be continuously removed from the laboratory. The first section of this paper analyzes the requirements for minimum air exchange in a laboratory, as a result of an extreme situation generated by an accidental spill of a hazardous liquid.The second section studies the level of concentration of flammable chemicals in the exhaust system. An extreme air flow situation is also analyzed.

The objective of the present investigation is to study the potential for both the under-floor displacement and personalized ventilation systems to improve air quality in commercial aircraft cabins.FLUENT was used to simulate airflow in a section of an aircraft cabin with the different ventilation systems : mixing, under-floor displacement, and personalized ventilation.The overall performance of each system was analyzed by comparing CO2 concentration, air temperature, and air velocity distributions.

For that study, the performance of an hybrid ventilation system with a pressure difference sensor in the central exhaust duct has been evaluated through the field measurement. That ventilation system was installed on a detached test house.The infiltration airflow rates of each room were measured by the constant concentration method with SF6 tracer gas. The airflow rate of the exhaust duct was measured by the constant injection method using CO2 gas as a tracer and by the hot wire anemometer.