Several energy-saving measures are commonly used in the operating room
(1) Fresh air system
The purification air-conditioning system of the clean operation department uses fresh air for centralized treatment, and the treated fresh air is sent to the circulation system of each operating room. It can also be used flexibly, and the centralized control of fresh air is conducive to the positive pressure requirements of each operating room. When the operating room is out of service, in order to ensure the cleanliness of the operating room, the required fresh air volume can be input through the frequency conversion setting of the fresh fan, but it does not need to pass through the air conditioning box, so that the clean operating room can be kept positive and clean, and the fresh air flow can be reduced. Energy consumption (air volume is about 3-4 times).
PS: "Usually, the air conditioning box circulates the air in the room to adjust the temperature and humidity through the air conditioning box, and then sends it back to the room. There is no outdoor fresh air; while the fresh air air conditioning box directly introduces air from the outside, and then filters and purifies it. Adjust the temperature, and if possible, adjust the humidity, and then send it directly into the room. The working characteristics of the fresh air air conditioning box determine that the fresh air air conditioning box has relatively strong evaporation heat transfer capacity and cooling capacity, and its design and manufacturing costs are relatively high. , the price is more expensive."
(2) Class 100 operating room secondary return air system
In clean room design, the problem of reheating energy consumption of the primary return air system has always existed. In Class 100 operating rooms, the air supply volume is very large. We are not willing to accept energy waste. Therefore, the Class 100 operating room adopts a secondary return air system, which is mixed with the return air after the cooling section of the air-conditioning box to replace reheating. In this way, the air volume can be satisfied, To achieve the purpose of energy saving.
(3) New exhaust air full heat exchange
Fresh air pretreatment also accounts for a large proportion of energy consumption. In areas like Beijing, Shanghai, and Guangzhou, where the latent heat load accounts for about 80% of the summer cooling load, full heat recovery can be used, and the exhaust air is pretreated through a heat exchanger. Fresh air achieves the purpose of energy saving. In order to prevent cross-infection, this measure is generally applicable to lower-level clean operating rooms.
(4) Optimal selection of air-conditioning water system and cold and heat sources
Hospital air-conditioning systems have distinct characteristics. Due to the different nature of use, the requirements are also different. For example, some require early heating, some require both cooling and heating throughout the year, some need to work 24 hours a day, and some require only 8 hours of normal work, etc., so the above factors should be fully considered when designing the system solution.
Under normal circumstances, hospitals are equipped with steam or hot water boilers, which can meet the requirements of different functions by setting plate heat exchangers with different heat transfer capacities and different outlet water temperatures; similarly, the same is true for chilled water systems; In terms of the system, the following two situations are worth analyzing:
1. The air-conditioning water is drawn from the large system of the whole hospital
This requires combining the loads of various functional rooms that are the same as those used in the operating room, such as ICU, emergency room, etc., and setting up a refrigerator that can only meet this load for use in summer, and plate heat exchangers can be used for combined cooling in transitional seasons and winters The tower provides free cooling, which is more economical to operate; heating uses a system of boilers combined with plate heat exchangers. In this way, the year-round cooling and heating can meet the needs of the operating room at the same time.
2. Adopt four-pipe cooling and hot water unit
That is, an independent air-conditioning cold and heat source system is adopted. This system selects units with different cooling (heating) capacity according to the air-conditioning cooling and heating load calculated by design. The water system is completely independent and separated from the water system of the entire hospital.
(5) Solution dehumidification air conditioning system (independent control of temperature and humidity)
Solution dehumidification technology can meet the requirements of removing residual humidity and odor through fresh air; indoors can use a cold source with a higher temperature to remove residual heat, which is the core idea of independent temperature and humidity control.
The solution humidity control technology uses the salt solution with the function of humidity control as the working medium, and uses the moisture absorption and dehumidification characteristics of the solution to control the air.
