Purify the air conditioning system
Selection of cold and heat sources for purifying air conditioning systems 1. Comparison and selection of centralized refrigeration stations and decentralized independent cold sources. Large-scale production plants centrally set up freezing stations, which are beneficial to construction investment and operation management. However, for some clean workshops with large differences in temperature and humidity requirements, different cooling parameters, operating rules and operating hours, on the basis of the centralized freezing station, decentralized, independent and dedicated refrigeration units are set up nearby, which is very important for energy saving. , guaranteeing parameters and facilitating operation and management have great benefits. Second, the refrigerant uses chilled water or direct evaporation of Freon. For large factories, it is beneficial to supply chilled water as a refrigerant for purifying the air conditioning system from a centralized freezing station. Due to the convenient transportation of chilled water, the cooling loss during the transportation process is small; moreover, the use of chilled water as a refrigerant is also beneficial to the control, adjustment and maintenance of the parameters of the purification air conditioning system. However, small independent and dispersed refrigeration units can use water-cooled chillers or air-cooled direct-evaporation refrigeration units. This will depend on the specifics of the specific project. 3. Use a compression refrigerator or a direct-fired lithium bromide absorption refrigerator. Piston-type, centrifugal-type, and screw-type refrigerators are all compression-type refrigerators. Centrifugal, screw-type, and other compression refrigerators are the most commonly used in the design of purification air conditioners. Because of its low investment and convenient operation and management, its power consumption is very high. However, in areas where power supply is tight and gas and coal supplies are more convenient, especially where waste heat and steam can be used, it is more economical to use a direct-fired lithium bromide absorption chiller, especially when this chiller provides cooling at the same time. Heat is also available. 4. The heating medium of the fresh air preheating heater for the purpose of antifreezing in winter is best to use electric heating or steam heating. Generally, it is not suitable to use hot water as the heating medium, so that the preheater itself may be in danger of being frozen. 5. The heating medium of the heater in the air-conditioning unit can be heated by hot water, steam or electric heating. The electric heating control is flexible and convenient, and the temperature control accuracy is high, but the operation cost is expensive, and it is generally used in places where there is no hot water and steam supply. Electric heating; when using hot water as the heating medium, it is not only convenient to adjust and manage, but also has high control accuracy. . 6. When the temperature accuracy is required to be very high (such as °C), it is a feasible method to set an electric heater with fine adjustment of temperature accuracy on the branch pipe sent to the clean room. 7. The most convenient, feasible, economical and reliable way to purify the air-conditioning system is to use superheated steam (≥0.2MPa) as the heating medium, and use a dry steam humidifier for humidification, or use an electric or electrode humidifier. When the accuracy of relative humidity is not high and the amount of humidification is large, water should be used for humidification, which can be in the form of water spray, wet film or spray (high-pressure spray or high-pressure micro-mist).
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