Effective control of temperature and humidity in operating room by fresh air unit
Most operating room projects use cold water coil to cool down, and there are many problems in operation. If the temperature is stable and the humidity increases, the temperature and humidity will not remain stable and the heart operating room will not operate normally. The reason is that the cold water coil of air conditioning unit is difficult to meet the wet load requirements in the process of refrigeration and dehumidification. For some large-scale operations, such as organ transplantation, it is extremely important to maintain stable temperature and humidity. Therefore, Anhui Renhe Purification believes that it is necessary to monitor the return air of the operating room, control the cold water flow of the circulating unit through the signals of the fresh air unit and the temperature sensor, and control the start and stop of the dehumidification equipment according to the signals of the humidity sensor.
For example, there are two first-class operating rooms with an area of 50m2, with residual heat of 8.5 kW and residual humidity of 2.85 kg/h, and fresh air centralized pretreatment, and each operating room is equipped with 1 circulating unit. The calculated dry bulb temperature of outdoor air conditioner is -35.5℃, the wet bulb temperature is 28.0℃, the indoor design dry bulb temperature is 23.5℃, and the relative humidity is 55%. The designed fresh air volume of each operation room is 1200 m3/h, and the average wind speed at the height of the working face is 0.25 ~ 0.30m/s. The fresh air is cooled and dehumidified by the cold water coil of the fresh air unit until the dew point of the machine at the state point is 14℃, and the dehumidifier is selected according to the calculated wet load. The performance curve of the dehumidifier determines that the dew point of the air at the state point after passing through the evaporation coil is 12℃, and after being reheated by condenser coil, it is processed to the state point of 2 1.5℃ and the humidity is 5 1%. The mixed state point of fresh air and return air after treatment is 22.8℃, and the humidity is 53%. The air supply temperature difference at this state point after treatment by the circulating unit is 3.5℃.
The temperature is controlled by the cold water flow of the corresponding circulation unit; When the circulating fan receives the normal shutdown instruction, the fresh air unit still keeps running for 2 ~ 3 r to keep the parts easy to carry bacteria such as surface cooler dry. Through the above measures, the hidden danger of secondary pollution can be effectively eliminated. Fresh air unit and circulating unit should be controlled separately. In the space with strict requirements on air quality, such as surgical operating room, the ambient temperature and humidity should be controlled within a certain range, which is helpful to enhance human immune function and inhibit the activities of pathogens.
Based on this, the hospital air conditioning unit has built-in direct cooling dehumidifier and fresh air unit to realize the concept of temperature and humidity separation control, and effectively control and use the heat released by condenser coil to adjust the supply air temperature, which has important use value for the temperature and humidity control of the whole operating room.
The above is "how to control the temperature and humidity of the sterile room in the operating room?" If in doubt, please contact Anhui people and Purification.