Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate

Alaa Abbas Mahdi; Alaa Abbas Mahdi

doi:doi:10.11648/j.ijmea.20160402.11

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Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate

Alaa Abbas Mahdi, Alaa Abbas Mahdi

Published in International Journal of Mechanical Engineering and Applications (Volume 4, Issue 2)

Received: 13 February 2016 Accepted: 25 February 2016 Published: 7 March 2016

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Abstract

Illnesses of many indoor air quality problems occur in office room. Ventilation is one way to control the contaminant transport and to provide better indoor air quality with in the office. In the evaluation of indoor air quality, CO₂ concentration is regarded as a good indicator to estimate the air quality level and to assess the performance of a mechanical ventilation system used by many designers, So the CO₂ concentration was used as the tracer gas in this study, also the humans respiration taken into account as CO₂ sources were the rate of production of carbon dioxide (CO₂) by human respiration. Experimental measurement and computational fluid dynamics (CFD) simulation methods were applied. The results from this study show that the floor-supply displacement ventilation can improve indoor air quality because the pollutant concentration in the breathing zone is lower than that of mixing system and the risk of cross contamination can be effectively reduced. Nevertheless, the indoor spaces with floor-supply displacement ventilation might have a higher risk of discomfort, because of high temperature stratification between the ankle and head levels when compared to traditional mixing ventilation. The results indicated that the contaminant distribution in a mechanically ventilated office room need to be studied individually according to different cases.

Published in	International Journal of Mechanical Engineering and Applications (Volume 4, Issue 2)
DOI	10.11648/j.ijmea.20160402.11
Page(s)	24-42
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Mixing Ventilation (MV), Displacement Ventilation (DV), Computational Fluid- Dynamics, Thermal Comfort, Indoor Air Quality

References

[1]	Huijuan Ch., “Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment”, Ph. D. Thesis, Linköping Studies in Science and Technology Dissertation, 2014.
[2]	Josephine Lau and Qingyan Chen, “Floor-supply displacement ventilation for workshops”, Building and Environment, 42 (4): 1718-1730, 2007.
[3]	Iraqi Code for cooling, University of Technology, The Ministry of Construction and Housing - Technical Department, 2012.
[4]	ANSI/ASHRAE Standard 62-2001 “Ventilation for Acceptable Indoor Air Quality American Society of Heating”, Refrigerating and Air-Conditioning Engineers.
[5]	Chen, Q. & Glicksman, L., “System performance evaluation and design guidelines for displacement ventilation”, Section J, Atlanta, GA: American Society of Heating, Refrigerating, and Air-conditioning Engineers, Inc, 2003.
[6]	ASHRAE (2004a). Standard 55-2004—Thermal environmental conditions for human occupancy. Atlanta, GA: American Society for Heating, Refrigerating and Air Conditioning Engineers.
[7]	Standard for Price Wall Mounted Displacement Diffusers Performance Data — Metric Units
[8]	Chen, Q. & Glicksman, L., “engineering guide air distribution”, Section E G, Atlanta, GA: American Society of Heating, Refrigerating, and Air-conditioning Engineers, Inc, 2003.
[9]	Andre Isele, Gerrit Hofker, Malcolm Cook, “Numerical Study on The Carbon Dioxide Distribution In a Naturally Ventilated Space”, Building Simulation, Sydney, Australia, 2011.
[10]	Yue Xu, “Modeling and Evaluation of Personal Displacement Ventilation System for Improving Indoor Air Quality”, M. SC. thesis, University of Miami, 2007.

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APA Style

Alaa Abbas Mahdi, Alaa Abbas Mahdi. (2016). Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate. International Journal of Mechanical Engineering and Applications, 4(2), 24-42. https://doi.org/10.11648/j.ijmea.20160402.11

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ACS Style

Alaa Abbas Mahdi; Alaa Abbas Mahdi. Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate. Int. J. Mech. Eng. Appl. 2016, 4(2), 24-42. doi: 10.11648/j.ijmea.20160402.11

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AMA Style

Alaa Abbas Mahdi, Alaa Abbas Mahdi. Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate. Int J Mech Eng Appl. 2016;4(2):24-42. doi: 10.11648/j.ijmea.20160402.11

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@article{10.11648/j.ijmea.20160402.11,
  author = {Alaa Abbas Mahdi and Alaa Abbas Mahdi},
  title = {Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate},
  journal = {International Journal of Mechanical Engineering and Applications},
  volume = {4},
  number = {2},
  pages = {24-42},
  doi = {10.11648/j.ijmea.20160402.11},
  url = {https://doi.org/10.11648/j.ijmea.20160402.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20160402.11},
  abstract = {Illnesses of many indoor air quality problems occur in office room. Ventilation is one way to control the contaminant transport and to provide better indoor air quality with in the office. In the evaluation of indoor air quality, CO2 concentration is regarded as a good indicator to estimate the air quality level and to assess the performance of a mechanical ventilation system used by many designers, So the CO2 concentration was used as the tracer gas in this study, also the humans respiration taken into account as CO2 sources were the rate of production of carbon dioxide (CO2) by human respiration. Experimental measurement and computational fluid dynamics (CFD) simulation methods were applied. The results from this study show that the floor-supply displacement ventilation can improve indoor air quality because the pollutant concentration in the breathing zone is lower than that of mixing system and the risk of cross contamination can be effectively reduced. Nevertheless, the indoor spaces with floor-supply displacement ventilation might have a higher risk of discomfort, because of high temperature stratification between the ankle and head levels when compared to traditional mixing ventilation. The results indicated that the contaminant distribution in a mechanically ventilated office room need to be studied individually according to different cases.},
 year = {2016}
}

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TY  - JOUR
T1  - Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate
AU  - Alaa Abbas Mahdi
AU  - Alaa Abbas Mahdi
Y1  - 2016/03/07
PY  - 2016
N1  - https://doi.org/10.11648/j.ijmea.20160402.11
DO  - 10.11648/j.ijmea.20160402.11
T2  - International Journal of Mechanical Engineering and Applications
JF  - International Journal of Mechanical Engineering and Applications
JO  - International Journal of Mechanical Engineering and Applications
SP  - 24
EP  - 42
PB  - Science Publishing Group
SN  - 2330-0248
UR  - https://doi.org/10.11648/j.ijmea.20160402.11
AB  - Illnesses of many indoor air quality problems occur in office room. Ventilation is one way to control the contaminant transport and to provide better indoor air quality with in the office. In the evaluation of indoor air quality, CO2 concentration is regarded as a good indicator to estimate the air quality level and to assess the performance of a mechanical ventilation system used by many designers, So the CO2 concentration was used as the tracer gas in this study, also the humans respiration taken into account as CO2 sources were the rate of production of carbon dioxide (CO2) by human respiration. Experimental measurement and computational fluid dynamics (CFD) simulation methods were applied. The results from this study show that the floor-supply displacement ventilation can improve indoor air quality because the pollutant concentration in the breathing zone is lower than that of mixing system and the risk of cross contamination can be effectively reduced. Nevertheless, the indoor spaces with floor-supply displacement ventilation might have a higher risk of discomfort, because of high temperature stratification between the ankle and head levels when compared to traditional mixing ventilation. The results indicated that the contaminant distribution in a mechanically ventilated office room need to be studied individually according to different cases.
VL  - 4
IS  - 2
ER  -

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Author Information

Alaa Abbas Mahdi

Mechanical Department, College of Engineering, University of Babylon, Babylon, Iraq
Alaa Abbas Mahdi

Mechanical Department, College of Engineering, University of Babylon, Babylon, Iraq

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APA Style

Alaa Abbas Mahdi, Alaa Abbas Mahdi. (2016). Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate. International Journal of Mechanical Engineering and Applications, 4(2), 24-42. https://doi.org/10.11648/j.ijmea.20160402.11

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ACS Style

Alaa Abbas Mahdi; Alaa Abbas Mahdi. Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate. Int. J. Mech. Eng. Appl. 2016, 4(2), 24-42. doi: 10.11648/j.ijmea.20160402.11

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AMA Style

Alaa Abbas Mahdi, Alaa Abbas Mahdi. Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate. Int J Mech Eng Appl. 2016;4(2):24-42. doi: 10.11648/j.ijmea.20160402.11

Copy | Download

@article{10.11648/j.ijmea.20160402.11,
  author = {Alaa Abbas Mahdi and Alaa Abbas Mahdi},
  title = {Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate},
  journal = {International Journal of Mechanical Engineering and Applications},
  volume = {4},
  number = {2},
  pages = {24-42},
  doi = {10.11648/j.ijmea.20160402.11},
  url = {https://doi.org/10.11648/j.ijmea.20160402.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20160402.11},
  abstract = {Illnesses of many indoor air quality problems occur in office room. Ventilation is one way to control the contaminant transport and to provide better indoor air quality with in the office. In the evaluation of indoor air quality, CO2 concentration is regarded as a good indicator to estimate the air quality level and to assess the performance of a mechanical ventilation system used by many designers, So the CO2 concentration was used as the tracer gas in this study, also the humans respiration taken into account as CO2 sources were the rate of production of carbon dioxide (CO2) by human respiration. Experimental measurement and computational fluid dynamics (CFD) simulation methods were applied. The results from this study show that the floor-supply displacement ventilation can improve indoor air quality because the pollutant concentration in the breathing zone is lower than that of mixing system and the risk of cross contamination can be effectively reduced. Nevertheless, the indoor spaces with floor-supply displacement ventilation might have a higher risk of discomfort, because of high temperature stratification between the ankle and head levels when compared to traditional mixing ventilation. The results indicated that the contaminant distribution in a mechanically ventilated office room need to be studied individually according to different cases.},
 year = {2016}
}

Copy | Download

TY  - JOUR
T1  - Experimental and Numerical Study of Air Flow Diffusion and Contaminants Circulation in Room Ventilation Related with Iraqi Climate
AU  - Alaa Abbas Mahdi
AU  - Alaa Abbas Mahdi
Y1  - 2016/03/07
PY  - 2016
N1  - https://doi.org/10.11648/j.ijmea.20160402.11
DO  - 10.11648/j.ijmea.20160402.11
T2  - International Journal of Mechanical Engineering and Applications
JF  - International Journal of Mechanical Engineering and Applications
JO  - International Journal of Mechanical Engineering and Applications
SP  - 24
EP  - 42
PB  - Science Publishing Group
SN  - 2330-0248
UR  - https://doi.org/10.11648/j.ijmea.20160402.11
AB  - Illnesses of many indoor air quality problems occur in office room. Ventilation is one way to control the contaminant transport and to provide better indoor air quality with in the office. In the evaluation of indoor air quality, CO2 concentration is regarded as a good indicator to estimate the air quality level and to assess the performance of a mechanical ventilation system used by many designers, So the CO2 concentration was used as the tracer gas in this study, also the humans respiration taken into account as CO2 sources were the rate of production of carbon dioxide (CO2) by human respiration. Experimental measurement and computational fluid dynamics (CFD) simulation methods were applied. The results from this study show that the floor-supply displacement ventilation can improve indoor air quality because the pollutant concentration in the breathing zone is lower than that of mixing system and the risk of cross contamination can be effectively reduced. Nevertheless, the indoor spaces with floor-supply displacement ventilation might have a higher risk of discomfort, because of high temperature stratification between the ankle and head levels when compared to traditional mixing ventilation. The results indicated that the contaminant distribution in a mechanically ventilated office room need to be studied individually according to different cases.
VL  - 4
IS  - 2
ER  -

Copy | Download