Modeling and Experimental Investigation of Laminar Ceiling Air Distribution System for Operating Room in Merjan Teaching Hospital

Isam A. Abed, Ruqaia A. Hamza


Room air distribution in operating rooms is critical to successful surgical treatment. The present study investigated the effects of the location of the air supply and exhaust grills on the air movement and air parameters inside an operating room. This paper presents an experimental and numerical analysis of air distribution in the operating room. The experimental work was conducted in an operating room in Merjan Teaching Hospital in the city of Babylon. Air was supplied from one square plenum box located in the middle of the ceiling, while air was exhausted through eight grills: large exhaust grills in the four upper corners and small exhaust grills in the four lower corners. In the theoretical work, a model of the operating room was developed and two cases were analyzed using the FLUEN 6.3.26 software program. The first case included all eight exhaust grills, while the second case included only the four lower exhaust grills. The ceiling system gave good ventilation for air distribution inside the operating room. There was no clear effect of the small exhaust grills located in the upper corners of the operating room. The height of the ceiling room is an effective factor in air distribution.


airflow distribution; air parameters ceiling laminar flow system; CFD; experimental work; operating room; simulation.

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Murakami, S., Kato, S. & Suyama, Y., Numerical Study on Diffusion Field as Affected by Arrangement of Supply and Exhaust Openings in Convectional Flow Type Clean Room, ASHRAE Transactions, 95(2), pp. 113-27, 1989.

Chen, Q., Comparison of Different k–Models for Indoor Airflow Computations, Numerical Heat Transfer, Part B; 28, pp. 353-69, 1995.

Cook, M.J. & Lomas, K.J., Buoyancy-driven Displacement Ventilation Flows: Evaluation of Two Eddy Viscosity Turbulence Models for prediction, Building Services Engineering Research and Technology, 19(1), pp. 15-21, 1998.

Alwan, A.A. & Hasan, A.A.F., Experimental Study of Air Distribution within Operating Room, The Iraqi Journal for Mechanical and Material Engineering, 14(3), pp. 317-330, 2014.

Honglu, Y.H., Experimental and Numerical Analysis of Diffuse Ceiling Ventilation, M.Sc. Thesis, Technical University of Denmark, pp. 51, 2011.

Lstiburek, J.W., Measurement of Ventilation and Internal Distribution, Building and Environment Journal, 71(Part 2), pp. 43-47, 2011.

Medhat, S.M., Mohamed, T.A. & Mohamed, G.G., Air Conditioning of a Low Ceiling Operating Theaters, Alexandria Engineering Journal, 45(4), pp. 387-400, 2006.

Abed, E.M. & Hamza, R.A., Experimental and Numerical Investigation of Hospital Surgery Room Air Distribution through Canopy, The Iraqi Journal for Mechanical And Material Engineering, 17(1), pp. 100-116, 2017.

Ho, S.H., Rosario, Y.L. & Rahman, M.M., Three Dimensional Analysis for Hospital Operating Room Thermal Comfort and Contaminant Removal, Journal of Applied Thermal Engineering, 29(10), pp. 2080-2092, 2009.

Mohammed, M.A.,Natural Ventilation: An Evaluation of Strategies for Improving Indoor Air Quality in Hospitals Located in Semi-arid Climates, PhD Thesis, School of Architecture, Planning and Landscape, 2015.

Alaadinn, A. & Al-shawi, A., Prediction of Radiant Cooling Panel’s Performance in Mixed Convection Environment, M.Sc. Thesis University of Technology, Iraq, 2011.

Yao, T. & Lin, Z., Numerical Study of the Effect of Air Terminal Layouts on the Performance of Stratum Ventilation System, 3rd International High Performance Buildings Conference at Purdue, 2014.



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