Airflow measurements techniques are necessary to determine the most basic of inddoor air quality questions : "Is there enough fresh air to provide a healthy environment for the occupants of the building?" . This publication outlines airflow measurement techniques, but it does not make recommendations for techniques that should be used. The airflows that are discussed are those within a room or zone, those between or zones, such as through doorways (open or closed) or passive vents, those between the building and outdoors, and those through mechanical air distribution systems.
This work, along with the experimental measurements on which it is based, was carried out in the framework of research undertaken by the French “Groupe de Pilotage sur la Qualité des Ambiances” (GPQA), whose task was to initiate and co-ordinate work on ai
This paper deals with the development of 2 approaches for the modelling of the transport of gaseous pollutant with CFD code Fluent. The pollutant is either considered as a scalar and modelled with a transport equation, or it is described through species transported modelling. The 2 methods are presented and the results compared to those obtained from an experiment made in a test cell with tracer gas SF6.
A personalized ventilation system located underneath the front edge of a desk was tested regarding to its ventilation efficiency using a heated mannequin and tracer gas. The air change effectiveness ranged from 1.4 to 2.7.
This study was aimed to analyse the ventilation efficiency and indoor air quality in the conventional kitchens, when porous screens were installed on the transoms. Numerical simulations and laboratory full-scale experiments were carried out in the model kitchen in the Department of Architecture at National Cheng-Kung University. The influences of porous screens on the temperature fields, flow structures and ventilation rates were indicated. The "Tracer-gas Concentration Decay" method was conducted to measure the air exchange rate and the age of air in the model kitchen.
The study characterised the mixing of tracer gas in three ventilation systems with two different airflow rates (totally outdoor air).The test procedure is presented and errors are calculated and compared.
Five different techniques of tracer gas measurement are reviewed in order to determine the total ventilation airflow rate as well as air distribution in the room, on site or in laboratory. Examples of applications are given insisting on the two most recent techniques.
Detailed testing of multi-zone airflow and ventilation rates in a dwelling were conducted using two different types of tracer gas method and compared with design.
This paper is based upon the results of measuring and simulating the air change in the single apartment of 5-storey multi-family dwelling. The technique of tracer gas concentration decay was applied to be able to assess the rate of air change. The building was used as normal by occupants so the results should be very accurate. The main aim of the research was to validate simulation methods used to predict infiltration. Multiven -the authors own program - was used to achieve this aim.
Describes a project which attempted to match simulated and measured tracer gas test results and to determine how much effort is necessary to produce sufficiently accurate results. The research assessed the overall value of CONTAM96 as a representative example of available simulation-model programs from both technical and practical viewpoints.
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