Building Simulation

, Volume 11, Issue 4, pp 773–786 | Cite as

Effectiveness of contaminant confinement in office spaces equipped with ceiling personalized ventilation system

  • Sorour Alotaibi
  • Walid Chakroun
  • Carine Habchi
  • Kamel Ghali
  • Nesreen Ghaddar
Research Article Indoor/Outdoor Airflow and Air Quality


Creating a micro-environment around infected occupants constitutes an effective strategy in reducing contaminants spread insuring a relatively clean macroclimate decreasing the risk of infection for occupants circulating in an office space. In this work, the ability of ceiling personalized ventilation (CPV) system assisted by desk fans (DF) or chair fans (CF) was studied with respect to confining contaminants spread in typical office space while considering possible occupant shift. A 3D computational fluid dynamics (CFD) model was developed to simulate particle spread. The developed model was validated experimentally with respect to concentration values using a thermal manikin in a climatic chamber with controlled particle generation. A parametric study was followed to determine the effect of the occupant shift from CPV design position, the CPV+DF or CF configuration, and the canopy angle on confinement performance for minimal particle spread in the space. The CPV jet and diffusers’ flow canopy favored particle deposition within the microclimate region leading to their removal from indoor air. For no occupant shift, assisting the CPV jet by DF or CF was very efficient in particle confinement. However, in the cases of critical backward occupant shift, flow asymmetry was formed around the occupant leading to particle spread and leading to asymmetry attenuation when operated with CF. The highest particle confinement was obtained for a canopy angle of 45° for the case of CPV assisted by CF due to forming a recirculation zone between the CPV and jet diffusers; hence trapping particles and reducing their spread to the macroclimate. It was found that a total supply flow rate of 60 L/s for MV is required compared to 43.5 L/s for the optimal CPV design, for equivalent average particle concentration within the macroclimate zone at the critical generation plane, leading to 62% reduction in power consumption of the supply fan.


ceiling personalized ventilation contaminant confinement macroclimate zone concentration asymmetry energy savings 


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The authors would like to acknowledge the financial support of Kuwait Foundation for Advancement of Science (KFAS), Project No P314-35EM-01.


  1. ASME (2004). Addenda to ASME AG-1–2003 Code on Nuclear Air and Gas Treatment. New York: American Society of Mechanical Engineers.Google Scholar
  2. ASHRAE (2009). ASHRAE Handbook—Fundamentals. Atlanta: American Society of Heating Air-conditioning and Refrigeration Engineers.Google Scholar
  3. ASHRAE (2013). Ventilation for Acceptable Indoor Air Quality. ANSI/ASHRAE Standard 62.1-2013. Atlanta: American Society of Heating, Air-Conditioning and Refrigeration Engineers.Google Scholar
  4. ANSYS (2016). ANSYS Software 17.2. Available at Scholar
  5. Bolashikov ZD, Melikov AK, Kranek M (2009). Improved performance of personalized ventilation by control of the convection flow around an occupant’s body. ASHRAE Transactions, 115(2): 421–431.Google Scholar
  6. Bolashikov ZD, Melikov AK, Kranek M (2010). Control of the free convective flow around the human body for enhanced inhaled air quality: Application to a seat-incorporated personalized ventilation unit. HVAC&R Research, 16: 161–188.CrossRefGoogle Scholar
  7. Bolashikov ZD, Barova M, Melikov AK (2015). Wearable personal exhaust ventilation: Improved indoor air quality and reduced exposure to air exhaled from a sick doctor. Science and Technology for the Built Environment, 21: 1117–1125.CrossRefGoogle Scholar
  8. Brook RD, Franklin B, Cascio W, Hong Y, Howard G, Lipsett M, Luepker R, Mittleman M, Samet J, Smith SC, Tager I (2004). Air pollution and cardiovascular disease: A statement for healthcare professionals from the expert panel on population and prevention science of the American Heart Association. Circulation, 109: 2655–2671.CrossRefGoogle Scholar
  9. Bruce N, Perez-Padilla R, Albalak R (2000). Indoor air pollution in developing countries: A major environmental and public health challenge. Bulletin of the World Health Organization, 78: 1078–1092.Google Scholar
  10. Cermak R, Melikov AK, Forejt L, Kovar O (2006). Performance of personalized ventilation in conjunction with mixing and displacement ventilation. HVAC&R Research, 12: 295–311.CrossRefGoogle Scholar
  11. Chen F, Yu SCM, Lai ACK (2006). Modeling particle distribution and deposition in indoor environments with a new drift–flux model. Atmospheric Environment, 40: 357–367.CrossRefGoogle Scholar
  12. Chen Q, McDevitt JJ, Gupta JK, Jones BW, Mazumdar S, Poussou SB (2012). Infectious disease transmission in airliner cabins. Report No. RITE-ACER-CoE-2012-01.Google Scholar
  13. El-Fil B, Ghaddar N, Ghali K (2016). Optimizing performance of ceiling-mounted personalized ventilation system assisted by chair fans: Assessment of thermal comfort and indoor air quality. Science and Technology for the Built Environment, 22: 412–430.CrossRefGoogle Scholar
  14. Englert N (2004). Fine particles and human health—A review of epidemiological studies. Toxicology Letters, 149: 235–242.CrossRefGoogle Scholar
  15. Fanger PO, Lauridsen J, Bluyssen P, Clausen G (1988). Air pollution sources in offices and assembly halls, quantified by the olf unit. Energy and Buildings, 12: 7–19.CrossRefGoogle Scholar
  16. Guo H, Lee SC, Chan LY, Li WM (2004). Risk assessment of exposure to volatile organic compounds in different indoor environments. Environmental Research, 94: 57–66.CrossRefGoogle Scholar
  17. Habchi C, Ghali K, Ghaddar N (2015a). Displacement ventilation zonal model for particle distribution resulting from high momentum respiratory activities. Building and Environment, 90: 1–14.CrossRefGoogle Scholar
  18. Habchi C, Ghali K, Ghaddar N, Shihadeh A (2015b). Chair fanenhanced displacement ventilation for high IAQ: Effects on particle inhalation and stratification height. Building and Environment, 84: 68–79.CrossRefGoogle Scholar
  19. Habchi C, Chakroun W, Alotaibi S, Ghali K, Ghaddar N (2016a). Effect of shifts from occupant design position on performance of ceiling personalized ventilation assisted with desk fan or chair fans. Energy and Buildings, 117: 20–32.CrossRefGoogle Scholar
  20. Habchi C, Ghali K, Ghaddar N, Chakroun W, Alotaibi S (2016b). Ceiling personalized ventilation combined with desk fans for reduced direct and indirect cross-contamination and efficient use of office space. Energy Conversion and Management, 111: 158–173.CrossRefGoogle Scholar
  21. He C, Morawska, L, Hitchins J, Gilbert D (2004). Contribution from indoor sources to particle number and mass concentrations in residential houses. Atmospheric Environment, 38: 3405–3415.CrossRefGoogle Scholar
  22. Kaczmarczyk J, Melikov A, Bolashikov Z, Nikolaev L, Fanger PO (2006). Human response to five designs of personalized ventilation. HVAC&R Research, 12: 367–384.CrossRefGoogle Scholar
  23. Keblawi A, Ghaddar N, Ghali K (2011). Model-based optimal supervisory control of chilled ceiling displacement ventilation system. Energy and Buildings, 43: 1359–1370.CrossRefGoogle Scholar
  24. Klepeis NE, Nelson WC, Ott WR, Robinson JP, Tsang AM, Switzer P, Behar JV, Hern SC, Engelmann WH (2001). The National Human Activity Pattern Survey (NHAPS): A resource for assessing exposure to environmental pollutants. Journal of Exposure Analysis and Environmental Epidemiology, 11: 231–252.CrossRefGoogle Scholar
  25. Khalifa HE, Janos MI, Dannenhoffer JF 2009. Experimental investigation of reduced-mixing personal ventilation jets. Building and Environment, 44: 1551–1558.CrossRefGoogle Scholar
  26. Lo LJ, Novoselac A (2010). Localized air-conditioning with occupancy control in an open office. Energy and Buildings, 42: 1120–1128.CrossRefGoogle Scholar
  27. Makhoul A, Ghali K, Ghaddar N (2013a). Desk fans for the control of the convection flow around occupants using ceiling mounted personalized ventilation. Building and Environment, 59: 336–348.CrossRefGoogle Scholar
  28. Makhoul A, Ghali K, Ghaddar N, Chakroun W (2013b). Investigation of particle transport in offices equipped with ceiling-mounted personalized ventilators. Building and Environment, 63: 97–107.CrossRefGoogle Scholar
  29. Makhoul A, Ghali K, Ghaddar N (2013c). Low-mixing coaxial nozzle for effective personalized ventilation. Indoor and Built Environment, 24: 225–243.CrossRefGoogle Scholar
  30. Makhoul A, Ghali K, Ghaddar N (2013d). The energy saving potential and the associated thermal comfort of displacement ventilation systems assisted by personalised ventilation. Indoor and Built Environment, 22: 508–519.CrossRefGoogle Scholar
  31. Melikov AK (2004). Personalized ventilation. Indoor Air, 14(s7): 157–167.MathSciNetCrossRefGoogle Scholar
  32. Melikov AK (2015). Human body micro-environment: The benefits of controlling airflow interaction. Building and Environment, 91: 70–77.CrossRefGoogle Scholar
  33. Morawska L (2006). Droplet fate in indoor environments, or can we prevent the spread of infection? Indoor Air, 16: 335–347.CrossRefGoogle Scholar
  34. Nazaroff WW (2004). Indoor particle dynamics. Indoor Air, 14(s7): 175–183.CrossRefGoogle Scholar
  35. Nguyen TA, Aiello M (2013). Energy intelligent buildings based on user activity: A survey. Energy and Buildings, 56: 244–257.CrossRefGoogle Scholar
  36. Nicas M, Nazaroff WW, Hubbard A (2005). Toward understanding the risk of secondary airborne infection: Emission of respirable pathogens. Journal of Occupational and Environmental Hygiene, 2: 143–154.CrossRefGoogle Scholar
  37. Russo JS, Dang TQ, Khalifa HE (2009). Computational analysis of reduced-mixing personal ventilation jets. Building and Environment, 44: 1559–1567.CrossRefGoogle Scholar
  38. Spengler JD, Sexton K (1983). Indoor air pollution: a public health perspective. Science, 221(4605): 9–17.CrossRefGoogle Scholar
  39. Sun W, Cheong KWD, Melikov AK (2012). Subjective study of thermal acceptability of novel enhanced displacement ventilation system and implication of occupants’ personal control. Building and Environment, 57: 49–57.CrossRefGoogle Scholar
  40. Sundell J (2004). On the history of indoor air quality and health. Indoor Air, 14(s7): 51–58.CrossRefGoogle Scholar
  41. Tashtoush B, Molhim M, Al-Rousan M (2005). Dynamic model of an HVAC system for control analysis. Energy, 30: 1729–1745.CrossRefGoogle Scholar
  42. Viegi G, Simoni M, Scognamiglio A, Baldacci S, Pistelli F, Carrozzi L, Annesi-Maesano I (2004). Indoor air pollution and airway disease. The International Journal of Tuberculosis and Lung Disease, 8: 1401–1415.Google Scholar
  43. Wang M, Lin CH, Chen Q (2012). Advanced turbulence models for predicting particle transport in enclosed environments. Building and Environment, 47: 40–49.CrossRefGoogle Scholar
  44. Yang B, Sekhar SC (2007). Three-dimensional numerical simulation of a hybrid fresh air and recirculated air diffuser for decoupled ventilation strategy. Building and Environment, 42: 1975–1982.CrossRefGoogle Scholar
  45. Yang B, Sekhar SC (2008). The influence of evenly distributed ceiling mounted personalized ventilation devices on the indoor environment. International Journal of Ventilation, 7: 99–112.CrossRefGoogle Scholar
  46. Yang B, Melikov AK, Sekhar SC (2009). Performance evaluation of ceiling mounted personalized ventilation system. ASHRAE Transactions, 115(2): 395–406.Google Scholar
  47. Yang B, Sekhar SC, Melikov AK (2010a). Ceiling-mounted personalized ventilation system integrated with a secondary air distribution system—A human response study in hot and humid climate. Indoor Air, 20: 309–319.CrossRefGoogle Scholar
  48. Yang B, Sekhar SC, Melikov AK (2010b). Ceiling mounted personalized ventilation system in hot and humid climate —An energy analysis. Energy and Buildings, 42: 2304–2308.CrossRefGoogle Scholar
  49. Yang B, Sekhar SC (2014). Interaction of dynamic indoor environment with moving person and performance of ceiling mounted personalized ventilation system. Indoor and Built Environment, 23: 920–932.CrossRefGoogle Scholar
  50. Yang J, Sekhar SC, Cheong D, Raphael B (2014). Performance evaluation of an integrated Personalized Ventilation–Personalized Exhaust system in conjunction with two background ventilation systems. Building and Environment, 78: 103–110.CrossRefGoogle Scholar
  51. Zhang Z, Chen Q (2006). Experimental measurements and numerical simulations of particle transport and distribution in ventilated rooms. Atmospheric Environment, 40: 3396–3408.CrossRefGoogle Scholar
  52. Zhang Z, Chen Q (2007). Comparison of the Eulerian and Lagrangian methods for predicting particle transport in enclosed spaces. Atmospheric Environment, 41: 5236–5248.CrossRefGoogle Scholar
  53. Zhang H, Arens E, Kim D, Buchberger E, Bauman F, Huizenga C (2010). Comfort, perceived air quality, and work performance in a low-power task–ambient conditioning system. Building and Environment, 45: 29–39.CrossRefGoogle Scholar
  54. Zhao B, Zhang Y, Li X, Yang X, Huang D (2004). Comparison of indoor aerosol particle concentration and deposition in different ventilated rooms by numerical method. Building and Environment, 39: 1–8.CrossRefGoogle Scholar
  55. Zhao B, Guan P (2007). Modeling particle dispersion in personalized ventilated room. Building and Environment, 42: 1099–1109.CrossRefGoogle Scholar
  56. Zhao B, Chen C, Tan Z (2009). Modeling of ultrafine particle dispersion in indoor environments with an improved drift flux model. Journal of Aerosol Science, 40: 29–43.CrossRefGoogle Scholar

Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Sorour Alotaibi
    • 1
  • Walid Chakroun
    • 1
  • Carine Habchi
    • 2
  • Kamel Ghali
    • 3
  • Nesreen Ghaddar
    • 3
  1. 1.Mechanical Engineering Department, College of Engineering & PetroleumKuwait University, KhaldiyaSafatKuwait
  2. 2.Mechanical Engineering Department, Faculty of EngineeringLebanese University, Branch IIRoumiehLebanon
  3. 3.Mechanical Engineering Department, Faculty of Engineering and ArchitectureAmerican University of BeirutBeirutLebanon

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