scholarly journals Estimation of bias with the single‐zone assumption in measurement of residential air exchange using the perfluorocarbon tracer gas method

Indoor Air ◽  
2014 ◽  
Vol 25 (6) ◽  
pp. 610-619 ◽  
Author(s):  
K. Van Ryswyk ◽  
L. Wallace ◽  
D. Fugler ◽  
M. MacNeill ◽  
M. È. Héroux ◽  
...  
Keyword(s):  
Tracer Gas ◽  
Air Exchange

Winter Measurements of Air Exchange Rates Using Tracer Gas Technique and Quantification of Gaseous Emissions from a Naturally Ventilated Dairy Barn

2011 ◽  
Vol 27 (6) ◽  
pp. 1015-1025 ◽  
Author(s):  
M. Samer ◽  
M. Fiedler ◽  
H.-J. Müller ◽  
M. Gläser ◽  
C. Ammon ◽  
...  
Keyword(s):  
Exchange Rates ◽  
Gaseous Emissions ◽  
Tracer Gas ◽  
Air Exchange

Estimating the air exchange rate using water vapour as a tracer gas in a semi-closed growth chamber

2012 ◽  
Vol 113 (1) ◽  
pp. 94-101 ◽  
Author(s):  
Ming Li ◽  
Toyoki Kozai ◽  
Genhua Niu ◽  
Michiko Takagaki
Keyword(s):  
Exchange Rate ◽  
Water Vapour ◽  
Growth Chamber ◽  
Tracer Gas ◽  
Air Exchange Rate ◽  
Air Exchange

Assessment of the ventilation efficiency in the breathing zone during sleep through computational fluid dynamics techniques

2018 ◽  
Vol 42 (4) ◽  
pp. 458-483
Author(s):  
Susana Hormigos-Jimenez ◽  
Miguel Ángel Padilla-Marcos ◽  
Alberto Meiss ◽  
Roberto Alonso Gonzalez-Lezcano ◽  
Jesús Feijó-Muñoz
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Airflow Obstruction ◽  
Developed Countries ◽  
Breathing Zone ◽  
Tracer Gas ◽  
Ventilation Efficiency ◽  
Distribution Parameters ◽  
Air Exchange

In developed countries, presence at home varies between 60% and 90% of the day, sleeping supposes 30%. Therefore, it is essential to ensure good indoor air quality that enhances health and benefits rest and recovery. In this context, it is necessary to achieve a balance between energy efficiency and air distribution parameters; thus, the influence exerted by the furniture of a bedroom on the air exchange efficiency, in the breathing zone during sleep, is assessed in this study. Computational fluid dynamics techniques, experimentally validated by the tracer gas (SF6) concentration decay method, are used to analyze 52 case studies corresponding to the same space, but varying both the number and the arrangement of the furniture inside. It is concluded that, in order to achieve a significant improvement in the air exchange efficiency, the number of elements included in the bedroom is not relevant, but the position of them. The highest increase in the ventilation efficiency in breathing zone is observed when the furniture is located avoiding the airflow obstruction in the area near the inlet and creating an unfilled volume of air in the area close to the outlet.

scholarly journals Diurnal and seasonal variation in air exchange rates and interzonal airflows measured by active and passive tracer gas in homes

2016 ◽  
Vol 104 ◽  
pp. 178-187 ◽  
Author(s):  
Gabriel Bekö ◽  
Sine Gustavsen ◽  
Marie Frederiksen ◽  
Niels Christian Bergsøe ◽  
Barbara Kolarik ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Exchange Rates ◽  
Passive Tracer ◽  
Tracer Gas ◽  
Air Exchange

Developing the 85Kr tracer gas technique for air exchange rate measurements in naturally ventilated animal buildings

2011 ◽  
Vol 109 (4) ◽  
pp. 276-287 ◽  
Author(s):  
M. Samer ◽  
H.-J. Müller ◽  
M. Fiedler ◽  
C. Ammon ◽  
M. Gläser ◽  
...  
Keyword(s):  
Exchange Rate ◽  
Tracer Gas ◽  
Air Exchange Rate ◽  
Air Exchange

scholarly journals Airborne infection in a fully air-conditioned hospital: I. Air transfer between rooms

1975 ◽  
Vol 75 (1) ◽  
pp. 15-30 ◽  
Author(s):  
N. Foord ◽  
O. M. Lidwell
Keyword(s):  
Temperature Difference ◽  
Tracer Gas ◽  
Airborne Infection ◽  
Air Exchange

SUMMARYMeasurements have been made of the extent of air exchange between patient rooms in a fully air-conditioned hospital using a tracer-gas method.When the rooms were ventilated at about six air changes per hour, had an excess airflow through the doorway of about 0.1 m.3/sec. and the temperature difference between rooms and corridor was less than 0.5° C., concentrations of the tracer in rooms close to that in which it was being liberated were 1000-fold less than that in the source room. This ratio fell to about 200-fold in the absence of any excess airflow through the doorways. Considerable dilution took place along the corridors so that the concentration fell by around 10-fold for every 10 m. of corridor.

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