Measurements of the interzonal airflows using multiple tracer gas techniques: Part-1 Application study on the mathematical solutions for changes of gas concentration

These airflows can be evaluated by using the multiple tracer gas techniques. The balances of tracer gases are expressed by a set of differential equations. In such a case, we have to obtain the suitable time T, to calculate the interzonal airflows using the above equations and mass balance equations of airflow rates when the tracergas concentrations were measured in each rooms.In this paper, we have a set of mathematical solutions for changes of gas concentration for 2 Rooms Model and a set of mathematical solutions for changes of gas concentration for 3 Rooms Model. These solutions are approximated by exponential functions according to the number of rooms.Ces flux d?air peuvent \ueatre \ue9valu\ue9s au moyen des techniques des gaz traceurs multiples. Les bilans des gaz traceurs sont exprim\ue9s par un ensemble d?\ue9quations diff\ue9rentielles. Dans un pareil cas, il nous faut obtenir la valeur de temps T appropri\ue9e, afin de pouvoir calculer le flux d?air interzonal au moyen des \ue9quations ci-dessus et des \ue9quations de l?\ue9quilibrage statique des d\ue9bits d?air lorsque les concentrations de gaz traceurs ont \ue9t\ue9 mesur\ue9es dans chacune des pi\ue8ces.Dans le cadre de ce document, nous pr\ue9sentons un ensemble de solutions math\ue9matiques relativement aux changements de concentration gazeuse pour un mod\ue8le de deux (2) pi\ue8ces et pour un mod\ue8le de trois (3) pi\ue8ces. Ces solutions sont approxim\ue9es par fonctions exponentielles en fonction du nombre de pi\ue8ces.Peer reviewed: YesNRC publication: Ye

On the multiple tracer gas techniques for measuring interzonal airflows in buildings

Presented at the 1990 ASHRAE Winter Meeting, Atlanta, GA, USA, Feb. 10-14, 1990Peer reviewed: YesNRC publication: Ye

Analytical accuracy of multiple tracer gas techniques for measuring interzonal airflows

Peer reviewed: YesNRC publication: Ye

Differential and integral method for computing interzonal airflows using multiple tracer gases

Peer reviewed: YesNRC publication: Ye

Multiple tracer gas techniques for measuring interzonal airflows for three interconnected spaces

The multiple tracer gas method is often used to predict interzonal airflows in buildings. In a previous study, this method was applied to a space consisting of two interconnected rooms where the airflows through the common wall were controlled and measured. The results indicated that the predicted airflows based on different sets of simultaneously measured tracer gas concentrations (obtained at different sampling times during a test) were not always the same. Guidelines are, therefore, needed to facilitate the selection of the appropriate set of tracer gas concentrations (from the measurements) for use with the multiple tracer gas method. In this study, the test rooms were expanded to three interconnected rooms. A method was developed to determine the appropriate set of concentrations for interzonal airflow calculations. The proposed method was tested in the laboratory and the results are discussed.La m\ue9thode des gaz traceurs multiples est souvent utilis\ue9e pour pr\ue9voir les \ue9coulements d'air interzonaux dans les b\ue2timents. Dans une \ue9tude ant\ue9rieure, cette m\ue9thode a \ue9t\ue9 appliqu\ue9e \ue0 un espace compos\ue9 de deux locaux communiquants o\uf9 les \ue9coulements d'air \ue0 travers le mur mitoyen ont \ue9t\ue9 r\ue9gl\ue9s et mesur\ue9s. Les r\ue9sultats ont r\ue9v\ue9l\ue9 que les \ue9coulements calcul\ue9s \ue0 partir de diff\ue9rents ensembles de concentrations de gaz traceurs mesur\ue9s simultan\ue9ment (obtenus \ue0 diff\ue9rents temps d'\ue9chantillonnage au cours d'un essai) n'\ue9taient pas toujours les m\ueames. Des lignes directrices s'imposent donc pour faciliter le choix d'ensembles de concentrations de gaz traceurs appropri\ue9s (\ue0 partir des mesures) pour la m\ue9thode des gaz traceurs multiples. Dans la pr\ue9sente \ue9tude, les locaux d'essai ont \ue9t\ue9 port\ue9s \ue0 trois pi\ue8ces communicantes. Une m\ue9thode a \ue9t\ue9 mise au point pour d\ue9terminer l'ensemble de concentrations appropri\ue9 pour les calculs d'\ue9coulement d'air interzonal. La m\ue9thode propos\ue9e a \ue9t\ue9 \ue9prouv\ue9e en laboratoire et les r\ue9sultats sont analys\ue9s.Presented at the 1990 ASHRAE Winter Meeting, Atlanta, GA, USA, Feb. 10-14, 1990Peer reviewed: YesNRC publication: Ye

Comparison of differential method and integral method for computing interzonal air flows - Part 2

Peer reviewed: YesNRC publication: Ye

Measurement of interzonal airflows using multiple tracer gas techniques. Part 2 - A proposal for tracer gas supply and an analytical method for calculating appropriate interzonal airflows

Sypnosis: Recently, wooden houses in Hokkaido have become more airtight. As concern for indoor airquality has grown, so too has the need to measure interzonal airflows in houses to assess the distributionof outdoor air. Interzonal airflows betseen rooms are usually calculated by measuring concentrations oftracer gases in each room.R\ue9cemment, les maisons en bois \ue0 Hokkaido ont gagn\ue9 en \ue9tanch\ue9it\ue9 \ue0 l?air. Comme on se pr\ue9occupe de plus en plus de la qualit\ue9 de l?air \ue0 l?int\ue9rieur, il devient d?autant plus n\ue9cessaire de mesurer les \ue9coulements d?air interzonaux dans les maisons afin d?\ue9valuer la diffusion de l?air ext\ue9rieur. Les \ue9coulements d?air interzonaux entre les pi\ue8ces sont habituellement calcul\ue9s par mesure des concentrations des gaz traceurs dans chaque pi\ue8ce.Article in Japanese, synopsis in EnglishPeer reviewed: YesNRC publication: Ye