English

This paper presents the results of 23 experiments during which reinforced spiral ducts were submitted to underpressure until they collapse. Experiments were operated with different duct diameters, reinforcement spacing, material and duct thickness. Results were analyzed and led to an equation for estimating the collapse pressure of such ducts.

A model for air flow inside ducts with leakages has been established from the equations governing the variation of total pressure and velocity along the duct. It was found that duct performance could be expressed as a function of two dimensionless constants, allowing the calculation of the required total pressure and velocity in the duct.

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.

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.

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 document results from a Working Group set up by the World Health Organization. It reviews States current approaches to protect population from environmental tobacco smoke exposure. The meeting defined conditions for successful policies and recommended strategies for future action.

This report informs and advises governments, public health authorities, policy makers and sectors relevant to indoor air quality management on how to develop and strengthen IAQ policy in order to protect and promote health in the indoor environment. Strategies and possible action plan for policies related to public non-industrial buildings. The report also summarizes experience in European countries and in the USA.

Multiple-skin facades were studied by means of experiments and numerical simulations. Experimental work was done on naturally and mechanically ventilated single storey multiple skin facades. Field experiments showed that good design and excellent workmanship are of crucial importance to obtain the desired performance. The measurements enables an insight into the complex nature of the airflow in naturally ventilated cavities. Measurements on a controlled experimental set-up provided data to develop and validate a numerical model. This model was then implemented in an energy simulation tool.