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Surgical room temperature humidity and pressure control
2018-12-05
 
According to the requirements of the "Hospital Cleansing Department Building Technical Specification GB50333-2002", the temperature and humidity of the operating room must be controlled within a certain range. Therefore, the operating room temperature in the design is set at t=22-25°C; the relative humidity is 35-60%. According to different sizes of rooms, configure the corresponding dehumidifying air conditioner and humidifier.
 
According to the principle of the three-zone and two-channel, the pressure of the surgical department is arranged from large to small as a special clean operating room, a general clean operating room, a clean corridor, a vertical passage and a dirt gallery. The cleanliness level of the clean corridor is lower or equal to that of the general clean operating room, so there is a pressure difference between the two. The dirt gallery is the lowest level in the entire surgical department, so the pressure difference between the operating room and the dirt gallery is greater than 5Pa. This can ensure the reasonable flow of airflow between different areas and prevent the invasion of external pollution.
 
For the operating room, in order to maintain the cleanliness of the room, from the pollution of the adjacent room, it is necessary to maintain a higher air pressure relative to the adjacent room, that is, maintain a positive static pressure difference with respect to the adjacent room. The existence of the static pressure difference prevents the outdoor air from entering the clean room from the gap when the door and the window are closed. In addition, when the door is opened, there should be enough airflow to flow outward to minimize the polluted air that the person brings in instantaneously. According to the provisions of the "Air Clean Technical Measures", to prevent gap penetration, generally two adjacent rooms should maintain a pressure difference of 5 Pa, while the outdoor should maintain a pressure difference of 15 Pa. For the 100-level operating room, according to the "Cleanhouse Construction Acceptance Specification", the positive pressure must meet the requirement that the cleanliness is not low at 0.6 meters from the door when the door is opened, that is, the gas brought in by the person when the door is opened instantaneously is not The deep entry port is 0.6 meters away. (See figure) The air conditioning design manual states that the working area of a general clean room is 0.8-1.5 meters above the ground. The flow rate of the vertical laminar flow operating room is 0.25-0.3m/s, the technical specification of the hospital clean operation department GB50333-2002 and the door height is about 2.0 meters, then Vo/V=(2.0-0.8)/0.6, V=0.15 m/s, that is, when the external V is not more than 0.15m/s, it will not affect the indoor laminar flow. According to the "Principles of Air Clean Technology", it is proposed that the intake air flow rate is 0.2m/s when entering the door, so it is clean. The chamber air flow rate is: V1 = 0.2 - V = 0.2 - 0.15 = 0.05 m / s. Assuming that the operating room door is 1.5 meters wide, the area of the door is: A = 2 * 1.5 = 3.0 square meters, so the air volume Q = A * V = 3.0 * 0.05 = 0.15 cubic meters / second, that is, 540 cubic meters / hour. Therefore, when the positive pressure air volume in the operating room is more than 540 cubic meters / hour, the laminar flow requirement can be satisfied.
 
When the system is in normal operation, the exhaust system can be installed in the system to remove excess gas, so that the positive pressure value of the operating room is always a reasonable value.
 
In addition, attention should be paid to setting up one or several clean operating rooms that can turn the positive pressure in the operating room into a negative pressure to prevent infectious diseases from transmitting the bacteria to others through the air conditioning system.



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