The main aim of the Tip-Vent project was to provide a contribution o the creation of improved boundary conditions for the application of mechanical ventilation systems with good levels of performance. The project has led to a better understanding of the true performance of ventilation systems, why they perform as they do and what improvements are achievable. The Tip-Vent source book synthetises the findings of the projects participants.

This report summarizes the work of the initial working phase of IEA Annex 35 "Hybrid Ventilation in New and Retrofitted Office and Educational Buildings". It describes the state-of-the-art of hybrid ventilation technologies, of control strategioes and algorithms and of analysis methods. It provides examples of existing systems and show solutions to specific problems in 22 office and educational buildings locate in different outdoor climates.

In 1998, an international research project entitled "Hybrid Ventilation in New and Retrofitted Office and Educational Buildings" was commenced under the auspices of the International Energy Agency. The fourth forum organized within the framework of this project was held in May 2002 in Montreal, Canada. About 25 papers related to the major outcomes and technologies were presented.

This report presents the status of airborne biocontamination measurements in France in residential and commercial buildings.

In general, there are 3 locations used for the fresh air supply in a standard cleanroom : under the ceiling of supply air plenum, at the return air shaft, and under the raised floor. In this study, the influences of the three different fresh air supply locations on field velocity and temperature distributions of fan filter unit are investigated then compared. The airflow distribution is simulated by the standard k-e turbulence model. Results are presented and discussed..

The Volatile Organic Compounds concentrations in indoor air tend to be higher than the level allowed by the standards or codes. Photocatalytic oxidation by employing UV radiation is a promising approach for the VOCs removal .The purpose of this paper is the development of a simple but effective model of photocatalytic oxidation air cleaner.With that model, the design and the selection of suitable photooxidation air cleaners and the measurement of their Volatile Oragnic Compounds removing effect can be easily conducted..

This paper deals with the use of an Air Curtain Device in a typical HVAC application where there is a need to provide aerodynamic sealing between a comfortable human enclosure and a warmer neighbour space.Three different complementary experiments were used in this work : tracer gas method (N2O), Flow field mapping and Infrared thermo-graphic visualizations.The used experimental methods revealed adequate and complementary to understand the flow topology of the studied case

Emissions due to chicken farming should be minimised because they increase the greenhouse effect on the one hand and odours lead to annoyance. This paper sums up the investigations conducted in various chicken houses to analyse the effect of drying the chicken manure. The emissions streams were measured in different sites with tracer gas (SF6 or Krypton 85). Thanks to suitable ventilation systems the manure can be dried and thus ammonia and odour emissions streams can be purposefully reduced.

A validated CFD model was used to generate concentration distribution data for CO2, radon and moisture in a Hong Kong workshop with displacement ventilation.Contaminant concentration distribution depends on the contaminant source type and location. A low concentration may be obtained in the occupied zone when the contaminant source is associated to a heat source whose thermal plume is sufficiently strong to reach the upper zone.

The objective of this paper was to illustrate the potential of the CFD technique to compare the effectiveness of different general ventilation systems in reducing the workers' exposure to styrene vapour in a workroom. . Thanks to the CFD technique predicted airflow velocities and styrene distribution are shown for the 3 different ventilation arrangements at identical planes across the room. And predicted values of styrene concentration at workers'position are given.