Articles
ASSESSMENT OF VENTILATION PERFORMANCE IN AGRICULTURAL FACILITIES USING “AGE OF AIR” CONCEPT AND CFD TECHNOLOGY
Article number
1008_25
Pages
191 – 199
Language
English
Abstract
The age-of air concept can be used to assess the ventilation performance of agricultural facilities.
The Local mean age (LMA) can be adopted to quantify and evaluate the fresh air distribution characteristics, while the Local mean residual life time (LMR) can be adopted to quantify and evaluate the exhaust potential for contaminants.
However, the experimental research has been limited due to the uncertainty and invisibility of gas detecting and point-monitoring of limited instrument.
To overcome these and increase applicability of studying, Kwon et al. (2011) used CFD technique in transient condition.
A three-dimensional experimental chamber was designed.
In validating the computations of the LMA and LMR, the results showed similar quantitative and qualitative distributions with average errors of 9 and 13%, respectively.
It could be concluded that the method of the Age of air via CFD was reasonably well designed and capable of estimating ventilation efficiency.
To evaluate the ventilation performance of agricultural facilities, the current status of equation for Age of air should be upgraded considering the multi-vents openings because this Age of air can just evaluate single vents opening.
Through the methodology presented in this study, the feasibility of analyzing ventilation efficiency using Age of air in agricultural facilities was confirmed and it will be upgraded for actual application considering characteristics of ventilation structure.
The Local mean age (LMA) can be adopted to quantify and evaluate the fresh air distribution characteristics, while the Local mean residual life time (LMR) can be adopted to quantify and evaluate the exhaust potential for contaminants.
However, the experimental research has been limited due to the uncertainty and invisibility of gas detecting and point-monitoring of limited instrument.
To overcome these and increase applicability of studying, Kwon et al. (2011) used CFD technique in transient condition.
A three-dimensional experimental chamber was designed.
In validating the computations of the LMA and LMR, the results showed similar quantitative and qualitative distributions with average errors of 9 and 13%, respectively.
It could be concluded that the method of the Age of air via CFD was reasonably well designed and capable of estimating ventilation efficiency.
To evaluate the ventilation performance of agricultural facilities, the current status of equation for Age of air should be upgraded considering the multi-vents openings because this Age of air can just evaluate single vents opening.
Through the methodology presented in this study, the feasibility of analyzing ventilation efficiency using Age of air in agricultural facilities was confirmed and it will be upgraded for actual application considering characteristics of ventilation structure.
Authors
K.-S. Kwon , I.-B. Lee
Keywords
“age of air”, CFD, LMA, LMR, ventilation efficiency
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