From experimental data on eight common air diffusers, authors developed simplified methods (the box method and the momentum method) to describe air flow and temperatures in the air jet that can be used as imput data for room air flow CFD calculations. The box method is appropriate for most of the diffusers. The momentum method gives good results for five diffusers. As it is simpler, authors recommend that it is used whenever applicable.

This study aims to validate a CFD model (Flovent) for calculation of temperature and particulate concentration in a ventilated room. Measurements were operated in a test room with a heat source and a cigarette source. Good agreement was found with the model for temperatures with a mixed ventilation system in the room as well as with a displacement ventilation system. For particulate concentrations, the model was validated for mixed ventilation and 'borderline validated' with displacement ventilation.

A simplified model for room cross-ventilation airflow has been developed using scaling analysis,experimental correlations and computational fluid dynamics. The model considers the main jet region and the recirculations region and leads to a set of formulas that predict the airflow rates and characteristic velocities in these two regions. Examples of application of the model to cross-ventilation design are presented.

This paper establishes the relationship between space pressurization ratio and air leakage flow through irregular cracks or through an open door . A numerical approach shows that room pressurization ratio can be estimated from room effective leakage area and from the pressure difference across the room shell.

The paper describes three methods for determination of the fan energy consumption associated to air filter : the hourly method (calculation of the hourly fan power), the segment method (lifespan filter-associated fan energy), the BIN method (estimation of annual filter-associated fan energy). etailed filter installing date and detailed hourly AHU system simulation.
These methods allow in particular to estimate the filter-associated fan energy consumption and the life-cycle cost of filters.

This paper gives information about the design of displacement ventilation systems for telecommunication equipment rooms, which need an increasing cooling load because of higher density and new generations of telecommunication systems.

The influence of wind velocity, jet width, jet angle and heat input on the efficiency of doorway air curtains in small air-conditioned spaces was investigated usical numerical simulation. Results show that proper design and installation of air curtain reduce air exchange between indoor and outdoor up to 90%. Optimum performance is obtained when the curtain air just reaches the floor. The corresponding critical air curtain velocity increases with external wind velocity normal to the doorway and with temperature difference between indoors and outdoors.

This paper investigates, using CFD simulation, the influence on energy and comfort of the position of small openings for air exchange between rooms in ventilated and air-conditioned rooms of highly airtight houses. Measurements of velocities and temperatures were operated in a Japanese house with floor heating and central air conditioning system providing some fresh airl. Results agree with these of CFD calculations. Calculations were used to search for the optimal position of small ventilation openings between rooms.

This paper discusses design issues for underfloor air distribution systems : design objectives, air distribution issues, occupants comfort issues, control of interior and perimeter zones.

Descibes an inter-laboratory comparison between 18 labs from 10 European countries to improve the procedure used to measure VOC emitted from samples of building materials and products in small test chambers.