الفهرس 
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Abstract
The most essential and expensive part of healthcare facilities is operating rooms (ORs). The air conditioning system is intended to maintain a consistent level of indoor air quality (IAQ). This design ensures optimal infection control and patient and operating crew thermal comfort. The goal of this thesis is to examine and evaluate indoor thermal comfort in a variety of scenarios in order to determine the optimal inlet air temperature for the OR. In this work, the predicted mean vote (PMV) and predicted percentage dissatisfied (PPD) models were employed in compliance with ISO 7730. To get the thermal environment parameters, field measurements were initially taken in an operating room at Kafr El-Sheikh Educational Hospital. These parameters are necessary to calculate the thermal comfort indices, which are (PMV & PPD). Four different scenarios with supplied air temperatures of 17.5, 18.5, 19.5, and 20.5oC were analyzed and compared. There are around 105 measurement points placed throughout the operation room. The PMV and PPD indices were calculated for three types of medical personnel in each case: surgeons (metabolic rate of 120 W/m2), nurses and surgeon’s assistants (100 W/m2), and anesthetists (70 W/m2). According to the findings, at the same air change rate, the input air temperature has a small influence on air velocities and airflow patterns inside the OR. Due to their varying thermal requirements, it is impossible to produce highly comfortable work conditions for all operational staff at the same time using the present ventilation system. A supplied air temperature of 18.5oC was found to give nearly comfortable circumstances for all surgical personnel.