الفهرس 
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Abstract
The hospital operating room ventilation system is pivotal to providing a healthy and comfortable surroundings for the patient and the surgical staff. Thermal comfort can be performed by controlling the temperature, humidity, and the air movement. Within this context, a Computational Fluid Dynamics (CFD) analysis is employed in the present work to simulate the temperature distribution, air flow pattern in the operating room for two different cases of vertical downward laminar air flow under the effect of different velocities, different air outlet levels and uniform heat flux. The present work, also contains a simple experimental study to achieve this issue. A range of air change rates is considered, from 5 to 35 ACH and depends on the velocity value with the fixed inlet area. The equipment layout and distribution is agreed as being representative of a typical newly designed operating room. The results show that system with air inlet immediately above the table at a velocity of 0.35m/s and with a symmetrical outlets at less height from the ground is the best choice to confirm the best thermal results. The aim of the thesis: The objective of the present study was to investigate theoretically(CFD analysis )and experimentally the distribution form/ behavior of air which supplied as (vertical- downward Laminar airflow) and also the temperature distribution behavior under the effect of: the deferent air supply velocities, two deferent diffuser location, and the deferent outlets levels in the operating room and so Provide a smile architectural/engineering approach for good design practice that was generally applicable in conventional operating room. The ranges of operating parameters under focus are: Inlet velocity: (0.1 to 0.35) m/s for theoretical study and (0.27 to 0.46) m/s for experimental study. Outlets level: (0.1 to 0.9) m for theoretical study and open door for experimental study. Air change rate: (10 to 35) ACH for theoretical study and (5 to 8) ACH for experimental study.