Design of Hospital Operating Room Ventilation using Computational Fluid Dynamics

Objective:

  • This project considers the contribution of the ventilation airflow to the thermal comfort and the transmission of particles (dust, bacteria, etc.)
  • Uses computational fluid dynamics (CFD) simulations to examine how changes in the design of a ward may improve the thermal comfort and reduce the transmission of contaminants from patients to other patients, visitors and health-care workers.
  • The results of this project can be used to advise the architects and engineers in the modelling/ modifying of the hospital rooms.

CFD Modeling:

Model Validation

Model Validation (Velocity and Temperature distribution)

Model Validation (Velocity and Temperature distribution)

 

 

Experimental case for the validation of the Lagrangian discrete trajectorymodel

Experimental case for the validation of the Lagrangian discrete trajectorymodel

 

Geometry

 

An isometric view of the OR model

An isometric view of the OR model

 

Meshing

Layout of a hexahedral (structured) surface mesh

Layout of a hexahedral (structured) surface mesh

 

Results

Volumetric BCPs (cfu/m3) counts during simulated surgery with horizontal (case 1 and 2) and vertical ventilation
strategy

Volumetric BCPs (cfu/m3) counts during simulated surgery with horizontal and vertical ventilation strategy (Based Active air-sampling method)

 

 

Sedimenting BCPs (cfu/m2 h) during simulated surgery with horizontal (case 1 and 2) and vertical ventilation
strategy

Sedimenting BCPs (cfu/m2 h) during simulated surgery with horizontal and vertical ventilation strategy (Based on Passive air-sampling methos)

 

 

Velocity-vector plot at the centre-plane of the operating table (50 ACH); (a) Horizontal case-1, (b) Horizontal case-
2, (c) Vertical

Velocity-vector plot at the centre-plane of the operating table (50 ACH);

(a) Horizontal case-1, (b) Horizontal case-2, (c) Vertical

 

Temperature contour plot at the centre-plane of the operating table (50 ACH); (a) Horizontal case-1, (b) Horizontal
case-2, (c) Vertical

Temperature contour plot at the centre-plane of the operating table (50 ACH);

(a) Horizontal case-1, (b) Horizontal case-2, (c) Vertical

 

 

On-going project:

  • In a mechanically ventilated environment, placing local supply and exhaust system could be a way of reducing the transfer of airborne infectious particles between areas of the room.
  • Designing the ventilation system so that patients perceive better thermal comfort and each area has a separate supply and extract further reduces the spread of bioaerosols between zones.
  • The results of this project demonstrate that changes in the design of a hospital ward may potentially reduce the risk of transmission of airborne infection between patients and other patients, visitors, and health-care workers, and improve the comfort of the indoor environment.
  • CFD simulation is an efficient and economical way for hospital spacial design and modification.

Keywords

Hospital, ventilation, infection, Computational Fluid Dynamics (CFD)

Contact

Sasan Sadrizadeh

Research Leader

Professor Sture Holmberg

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Last changed: Feb 02, 2016