Mean age of air in a naturally ventilated office: Experimental data and simulations

Abstract Indoor air quality has an important role as health determinant; it relates to the health and comfort of building occupants. The present paper investigates the wind-forced natural ventilation rates of an office as observed with tracer decay, according to ISO 16000-8:2007 Standard, both with an experimental and numerical procedure; experimental data were used to validate the numerical method. Moreover the only infiltration rate case was analyzed. Natural ventilation was created by opening the window and the door of the office. A simulation model of the room was carried out by using the computational fluid dynamics (CFD) code Fluent. The experimental set up of the procedure was developed by a portable gas chromatograph. In both the numerical and experimental approach the mean age of air linking to ventilation efficiency was calculated. The defined experimental procedure can be applied to different situations, in order to evaluate the efficiency of both natural and forced ventilation existing systems. When the ventilation is due to the opening of the window and the door, the simulation results are in a good agreement with the experimental ones, therefore the model could be applied to different situations, in order to reduce costs and time in the evaluation of indoor air quality.

[1]  Mats Sjöberg,et al.  The use of moments for assessing air quality in ventilated rooms , 1983 .

[2]  Andrew P. Jones,et al.  Indoor air quality and health , 1999 .

[3]  Yang-Cheng Shih,et al.  Experimental performance investigation of ventilation schemes in a private bathroom , 2010 .

[4]  M. Sandberg.  What is ventilation efficiency , 1981 .

[5]  Pierre-Sylvain Mirade,et al.  Computational fluid dynamics (CFD) modelling of local mean age of air distribution in forced-ventilation food plants , 2009 .

[6]  Joseph Andrew Clarke,et al.  Experimental and numerical study of local mean age of air , 2001 .

[7]  Christos H Halios,et al.  On the estimation of characteristic indoor air quality parameters using analytical and numerical methods. , 2007, The Science of the total environment.

[8]  K. W. Cheong.  Tracer gas technology for airflow measurements in HVAC systems , 1996 .

[9]  Xudong Yang,et al.  Total air age: an extension of the air age concept , 2003 .

[10]  Guohui Gan,et al.  Effective depth of fresh air distribution in rooms with single-sided natural ventilation , 2000 .

[11]  Benoît Ozell,et al.  Airflow modelling in a computer room , 2004 .

[12]  Wonho Yang,et al.  Indoor air quality investigation according to age of the school buildings in Korea. , 2009, Journal of environmental management.

[13]  Daniel Berckmans,et al.  Data-based mechanistic modelling approach to determine the age of air in a ventilated space , 2006 .

[14]  P Heiselberg,et al.  Experimental and CFD evidence of multiple solutions in a naturally ventilated building. , 2004, Indoor air.