Personal Exposure to Contaminant Sources in Ventilated Rooms

In this study Computational Fluid Dynamics (CFD) is used to predict the personal exposure to contaminant sources in a ventilated room. A CFD model of a person is located in a displacement ventilated room as well as in a mixing ventilated room. The personal exposure to different contaminant sources is simulated, taking both the concentration gradients and the local influence of the person into account. The results show that the personal exposure is highly dependent both on the kind of source as well as on the ventilation system. The simulations show that it is not sufficient to know the local concentration in an empty room, the local impact of a person is distinct and should be considered in the personal exposure assessment. INTRODUCTION When a person is located in a ventilated room where concentration gradients prevail, the local concentration field may be changed significantly and thus the personal exposure. The reason is the local change in the flow field caused by the presence of the person, e.g. due to: the excess surface temperature of the human body that generates a convective ascending air current along the body. a person may locally act as an obstacle to the general flow field.

[1]  P. Fanger.  Introduction of the olf and the decipol units to quantify air pollution perceived by humans indoors and outdoors , 1988 .

[2]  Henrik Brohus,et al.  Personal Exposure in a Ventilated Room with Concentration Gradients , 1994 .

[3]  Shinichi Tanabe,et al.  Indoor Environmental Quality ( IEQ ) Title Evaluating thermal environments by using a thermal manikin with controlled skin surface temperature , 2006 .

[4]  Peter V. Nielsen,et al.  Exposure Due to Interacting Air flows Between Two Persons , 1996 .

[5]  P. Nielsen,et al.  Transfer of Emission Test Data from Small Scale to Full Scale , 1995 .

[6]  W. Snow,et al.  Ventilation of buildings , 1906 .

[7]  Guohui Gan,et al.  Numerical Method for a Full Assessment of Indoor Thermal Comfort , 1994 .

[8]  T. Kim,et al.  Modeling a worker's exposure from a hand-held source in a uniform freestream. , 1991, American Industrial Hygiene Association journal.

[9]  B. W. Jones,et al.  A comprehensive data base for estimatng clothing insulation , 1985 .

[10]  Philomena M. Bluyssen,et al.  Addition of Olfs from Different Pollution Sources, determined by a Trained Panel , 1991 .

[11]  Peter V. Nielsen,et al.  Merging Thermal Plumes in the Indoor Environment , 1995 .

[12]  S. Patankar.  Numerical Heat Transfer and Fluid Flow , 2018, Lecture Notes in Mechanical Engineering.

[13]  B. Ljungqvist,et al.  Interaction between air movements and the dispersion of contaminants: clean zones with unidirectional air flow. , 1993, Journal of parenteral science and technology : a publication of the Parenteral Drug Association.

[14]  J. S. Hunter,et al.  Statistics for Experimenters: An Introduction to Design, Data Analysis, and Model Building. , 1979 .

[15]  P. Fanger,et al.  Perceived Air Quality in a Displacement Ventilated Room , 1996 .

[16]  Robert Jennings Heinsohn.  Industrial Ventilation: Engineering Principles , 1991 .

[17]  P. Nielsen,et al.  Contaminant Distribution around Persons in Rooms Ventilated by Displacement Ventilation , 1994 .

[18]  新一 田辺,et al.  サーマルマネキンを用いた立位・座位人体各部位の放射・対流熱伝達率の測定 , 1997 .

[19]  Henrik Brohus,et al.  CFD Models of Persons Evaluated by Full-Scale Wind Channel Experiments , 1996 .

[20]  D. DuBois,et al.  A formula to estimate the approximate surface area if height and weight be known , 1989 .

[21]  Povl Ole Fanger,et al.  Field study on addition of indoor air sensory pollution sources , 1996 .

[22]  Henrik Brohus,et al.  Personal Exposure in Displacement Ventilated Rooms , 1996 .

[23]  D. Spalding,et al.  Heat and mass transfer in boundary layers: A general calculation procedure , 1970 .

[24]  Isaac Turiel,et al.  Indoor air quality and human health , 1985 .

[25]  M. Nielsen,et al.  Studies on the heat loss by radiation and convection from the clothed human body. , 1953, Acta physiologica Scandinavica.

[26]  R. Reyment,et al.  Statistics and Data Analysis in Geology. , 1988 .

[27]  Peter V. Nielsen.  Displacement Ventilation: theory and design , 1993 .

[28]  R P Clark,et al.  Forced convection around the human head. , 1975, The Journal of physiology.

[29]  Peter V. Nielsen,et al.  Temperature Distribution in a Displacement Ventilated Room , 1996 .

[30]  Dennis K. George,et al.  Aerodynamics and Exposure Variability , 1991 .

[31]  T. Kim,et al.  Airflow pattern around a worker in a uniform freestream. , 1991, American Industrial Hygiene Association journal.

[32]  M R Flynn,et al.  The effect of contaminant source momentum on a worker's breathing zone concentration in a uniform freestream. , 1992, American Industrial Hygiene Association journal.

[33]  C. Jayatilleke,et al.  The influence of Prandtl number and surface roughness on the resistance of the laminar sub-layer to momentum and heat transfer , 1966 .

[34]  D. Kerslake.  The stress of hot environments. , 1972, Monographs of the Physiological Society.

[35]  Carl-Erik Hyldgård.  Humans as a Source of Heat and Air Pollution , 1994 .

[36]  I. Mabuchi,et al.  Flow around a finite circular cylinder on a flat plate , 1984 .

[37]  Roy Holmberg,et al.  Inhalation-zone air quality provided by displacement ventilation , 1990 .

[38]  R. Kamens,et al.  The Significance and Characteristics of the Personal Activity Cloud on Exposure Assessment Measurements for Indoor Contaminants , 1991 .

[39]  N. Toy,et al.  Natural convection around the human head. , 1975, The Journal of physiology.

[40]  Henrik Brohus,et al.  Personal Exposure to Contaminant Sources in a Uniform Velocity Field , 1995 .

[41]  P. Bradshaw,et al.  Turbulence Models and Their Application in Hydraulics. By W. RODI. International Association for Hydraulic Research, Delft, 1980. Paperback US $15. , 1983, Journal of Fluid Mechanics.

[42]  H. Schlichting.  Boundary Layer Theory , 1955 .

[43]  A. Watson,et al.  Assessment of Human Exposure to Air Pollution: Methods, Measurements, and Models , 1988 .

[44]  Wayne R. Ott,et al.  Total human exposure , 1985 .