English

Field measurements were conducted first in two Korean high-rise residential buildings to show and understand the characteristics of pressure difference and problems due du stack effect. Then a simulation of several high-rise buildings was made to confirm those characteristics and problems. It appears that most of the stack pressure difference acts on interior partitions rather than on exterior walls. A solution is proposed to solve the pressure difference problems.

A mathematical model has been developed to simulate airflow control systems of ventilation units, then implemented. The simulations results are compared with the experimental results and with data obtained from analytical predictions too. Finally, the results of simulations of the entire ventilation unit control system for two different types of loading conditions are provided.

The transient natural ventilation of a warm room is investigated in this paper. The authors developed a simple model to describe the transient oscillatory process. The application of the model is then discussed and demonstrates how pre-cooled draining maybe employed appropriately to provide thermal comfort in a room not occupied permanently.

To learn more about indoor PM concentrations and associated health risks in schools, data has been collected on indoor air climate parameters in German classrooms (92 in winter 2004-2005 and 75 in summer 2005) only during teaching hours. The results showed that exposure to particulate matter in school is high. Further investigations are necessary to assess the toxic potential of indoor particles and develop strategies to ensure a better IAQ in schools.

In this paper, the author examines the contributions of indoor exposures to ozone and its ozone-initiated oxidation products to ozone's overall impact on public health. He presents relatively simple strategies that could mitigate those effects. For example, by filtering ozone from ventilation air and by limiting the indoor use of products and materials whose emissions react with ozone.

in that study the extent to which US schools are implementing IAQ programs is analyzed. It appears that having a program is not equivalent to implementing effective IAQ policies and procedures. The survey results indicate that schools are paying an increasing amount of attention to IAQ and when actively supported by the school administration the program appears a good means to improve the learning environment for US schoolchildren.

In that paper, the data collected in a previous study was used to examine the impact of season, home ventilation, and particle composition on associations between ambient concentrations and corresponding personal exposures to particles and gases. The results suggest that ventilation may be an important modifier of the magnitude of effect in time-series health studies, and that results from time-series health studies are more readily analysable for particles than for gases.

Two government facility ventilation systems were evaluated in that study, one with a recirculation system, and the other one that used 100% outside air with no recirculation. For the two systems different filters have been tested : low-efficiency bag filters and medium-efficiency filters for the first one and electrostatic bag filters and V bank filters for the second one. The results of a 3 year evaluation are presented.

For that paper, the three-dimensional flow patterns and the real-time tracer gas leakage were studied to understand the physical mechanisms of the contaminant dispersion and containment leakage during the ventilation process through a laboratory fume hood. In that aim the laser-assisted flow visualization method and the standard/special gas sampling technique were used.

In this paper , eight simple steps for designing a DOAS with CRCP system are provided . They consist in the determination of design outdoor air conditions, target space conditions, design cooling load and required ventilation rate for each space, supply air conditions, enthalpy wheel effectiveness and design cooling coil load, sensible cooling load for the CRCP system, design panel cooling capacity. The following of those steps should be very useful for engineers considering a DOAS/CRCP system.