الفهرس 
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Abstract
The ventilation is a very important item and should be studied during the design of the clean room, where there are special requirements for the air specifications like its cleaning, distribution and relative humidity where the goal of the ventilation is to sweep the air and the contamination included on it and then filter this with a high accurate filters and then re-back the air to the room again with a comfortable velocity and temperature distribution with a minimum amount of eddies.
The application of the clean rooms include: conductors, medicines, and aerospace factories and so hospitals, and operating rooms which is the point of this investigation.
In this investigation, the velocity temperature and particles distribution are studied inside the operating room and so the indoor air quality in terms of two parameters which are the predicted mean vote (PMV), which refer to the thermal sensation comfortable and the mean age of air, which refer to the air refersness for a three groups of rooms, at the first group, only one case studied for the operating rooms of heights 4, 4.5m and 5m. For the second and third groups, six different cases are studied for operating rooms of both heights of 3 and 3.5m.
This thesis include six chapters as follows:
Chapter (1):
This chapter includes an introduction about the ventilation of clean rooms and its standards and regulations, the second part of this chapter includes the types of ventilation for the operating rooms.
Chapter (2):
This chapter includes a historical review for the previous work of using the computational fluid dynamics for studying the ventilation inside rooms.
Chapter (3):
This chapter includes the different shapes of the studied models and then the differential equations of heat transfer and air flow and the way to solve them numerically.
Chapter (4):
In this chapter the velocity, temperature and particles distributions are studied for the three groups of rooms, for group one, one room shape is studied for the operating rooms of heights 4, 4.5 and 5m. For the second groups. For the second and third groups, six different cases are studied for operating rooms of both heights of 3 and 3.5m.
Chapter (5):
In this chapter the indoor air quality is studied for the mentioned three groups in terms of the two parameters of the air quality which are the PMV and the mean age of air.
Chapter (6):
In this chapter the results of chapters (4) and (5) are discussed and then mention of the concoctions and the recommendation for the future works at the same field.