For that paper, a leading commercially available ionic air cleaner has been tested in a typical residential apartment in order to study the effect of the device on indoor/outdoor particle number and mass concentration ratios. The indoor ozone and ion concentration levels have been determined too. The findings are presented.

Numerical simulations of push-pull ventilation systems are presented in this paper. That device is commonly used for the capture of pollutants form large tanks used in industrial chemical processes. For that study a finite volume model coupled with a standard turbulent model has been employed to describe the flow structures and their characteristics (dispersion, transition, encapsulation and strong suction). Other geometric parameters that influence the flow characteristics have been analyzed such as flange size, pull-channel size, offset distance.

Researchers from the National Institute for Occupational Safety and Health have evaluated the relationship between flow differential and pressure differential in 67 Airborne infection isolation rooms (AIIRs) and simulated AIRR. The date collected in the simulated AIRR allowed the development of an empirical model describing the relationship between the flow differential, the pressure differential and the leakage area. The data gathered in health care facilities proved the model predicted the leakage with accuracy . That model appears as an effective and cost-cutting tool.

The Goal and the target methods are discussed in this study , they are used for balancing exhaust ventilation duct systems with dampers. For each, a detailed step-by-step procedure is presented. For the goal method, the damper is adjusted in each branch until the airflow for each branch equals the goal airflow : it is time consuming and the overall resistance of the system increases, reducing the fan output. Concerning the target method, simulations predict a better accuracy for fewer adjustments than the goal method, but it is more computationally difficult.

For that study , measurements of carbon dioxide and ultrafine particles were carried out in four restaurants located in 2 different cities in northwest Ohio. In each city, one restaurant was smoke free and the other one had a dedicated smoking room. A smoke free office space was assessed as a reference site. The results of the measurements show that C02 levels were elevated in all 4 restaurants with an inadequate fresh air supply.

For that study, the authors have performed a numerical simulation of the flow field for a design of contra-rotating axial flow fans (CRAFF). The performance prediction was then validated by test data.A guideline for shaft power matching is presented too. Finally a comparison of the blade pitch angles obtained from the guideline with those obtained form the numerical simulation have been carried out for six designs of CRAFF. The deviations from the optimum obtained by CFD are within 2. That means the guideline is correct and can save a lot of time and money.

For that study, the performance of two personalized ventilation systems supplying air at the breathing zone have been tested in a full-scale test room in conjunction with underfloor ventilation.Breathing thermal manikins were used for the simulation of occupants. Compared to underfloor ventilation alone, personalized and underfloor ventilation provided excellent protection from any pollution for the occupants.

For that paper, a case study was conducted to compare the performance of two control methods in an office environment : conventional setpoint control and predicted mean vote (PMV) based control. To obtain the thermal environments created by the two control methods, computer simulations have been used. The results show that the conventional control caused a reduction in human productivity whereas the PMV control performed well for both human comfort and human productivity.

For the experiment detailed airflow fields were measured in three cases of ventilation air temperature : an isothermal case, a hot case and a cold case.The experimental data have been used to test four two equations turbulence models. And it appears that none of the models is reliable concerning the cold case whereas they all can predict reasonably the hot and isothermal cases global values of temperature and velocity. Those models are not able to predict the exact experimental velocity and temperature fields.

The numerical simulation results of the stack effect in medium-rise buildings in Harbin (cold region in China) are presented in that paper. The multizone ventilation model COMIS was used for the simulation. The effect of the wind speed velocity and the temperature of the stairwell on the pressure difference curves shape have been investigated. It appears that the wind speed velocity may have a strong effect on the pressure difference.