As we all know, operating room purification is very important for hospitals, and the choice of air purification is also exquisite. How to select a suitable operating room for purifying the air conditioning system, including fresh air load and indoor wet load, and reduce the indoor sensible heat load and cooling load of the air conditioning unit, and at the same time, in order to avoid the process of dehumidification and reheating of the air conditioning unit and the reheating of the fresh air unit are actually the waste heat discharged by the condenser.
(1) Adopt secondary return air system to reduce operation cost
The air volume of the hospital purification air conditioning system is large, and the temperature difference between the air supply and the air supply is very small, especially in the laminar flow ward of the I and II operating rooms, the temperature difference between the air supply and the air supply is very small, usually only 1 ℃ ~ 2 ℃, for the purification of the operating room, using the traditional primary return air system, the fresh air cooling dehumidification and return air mixing should have enough heat to heat the air supply, In this part of the heating and cooling dehumidification process, there are serious hot and cold compensation problems, which lead to the increase of operating costs and energy waste.
In the practical application of the project, we often use the fixed proportion of primary return air and secondary return air to reduce the reheat load. At the same time, the air volume and cooling capacity of the cold coil tube decrease after treatment. Due to the change of indoor load, the purification system in operating room can adjust the temperature difference of air supply without reheating or with a small amount of reheating, which is enough to meet the needs of indoor temperature and humidity regulation. Therefore, in operating room purification, the use of secondary return air can achieve good energy-saving effect, is an effective energy-saving method, and has been widely used in engineering practice. In operation room I of the same grade and size, 55% air conditioning units are saved for fresh air load and secondary return air system, and more than 80% electric heating is saved for cooling capacity. Therefore, the secondary return air system is one of the effective ways to save energy in operating room purification. Of course, the secondary return air system is mainly suitable for high-rise operating rooms and laminar flow wards with large air volume, small temperature difference and stable indoor load.
(2) Deep dehumidification and centralized treatment with fresh air
The depth of air dehumidification is generally cold with two layers of meters. The first level gauge and the central air conditioner cool 7 ℃ chilled water, which will be regarded as the indoor air dew point L1 of air humidity. Then, the direct evaporation type cooling coil is used to realize secondary dehumidification, L2 point treatment. The evaporator is used for refrigeration dehumidification, and the condenser is used for dehumidification and reheating, and the air humidity is treated as the dew point of air supply to below L1. Fresh air bears all the wet loads. The purification of operating room, including fresh air load and indoor wet load, and the indoor sensible heat load and cooling load reduction of air conditioning unit. At the same time, in order to avoid the process of dehumidification and reheat of air conditioning unit, the waste heat discharged by condenser is actually used. In operating room purification, centralized deep dehumidification of fresh air can save 25% of cooling capacity of air conditioning unit and 100% of electric reheat. The comprehensive energy saving is up to 50% ~ 60%.
Therefore, the deep dehumidification of fresh air in operating room is also an effective energy-saving technical measure, but this form should be determined according to the conditions of cold and heat sources and the characteristics of the area. First of all, deep dehumidification of fresh air is suitable for low temperature cold source. If there is no condition, the dehumidification effect cannot be achieved. In addition, the operating room purification fresh air deep dehumidification is suitable for the humid areas in the south, not for the cold areas and cold areas.
The selection of the methods applicable to the purification air conditioning system and the application of the secondary return air system, such as the design of the purification air conditioning system of dehumidification and cooling air deep cleaning engineering company, can be considered as the effective energy-saving technical measures in the application process. In practice, according to the specific characteristics of the project, the region, the selection and application of cold and heat sources.