The selection, arrangement and installation of air filter shall be in accordance with the following requirements: oil immersed filter shall not be selected for primary air filter; medium efficiency air filter shall be set in positive pressure section of purified air conditioning system; high efficiency air filter or sub high efficiency air filter shall be set at the end of clean air conditioning system; the installation method of high efficiency air filter shall be simple and reliable, and leakage detection shall be conducted Replacement; medium efficiency, sub high efficiency and high efficiency air filters should be selected according to the rated air volume; high efficiency air filters with similar resistance and efficiency should be set in the same purification workshop.
When determining the centralized or decentralized purified air conditioning system, the characteristics of the production process and the cleanliness level, area and location of the air in the purification workshop should be comprehensively considered. When the production process is continuous, dust-free room or purification workshop has a large area, the clean room with centralized location and strict requirements for noise control and vibration control should adopt centralized purified air conditioning system.
If the purified air conditioning system needs electric heating, the tubular electric heater should be selected, and the position should be arranged on the windward side of the high efficiency air filter, and there should be fire safety measures.
The forced draft fan can be selected according to the total air supply volume and total resistance value of the purified air conditioning system, and the resistance of medium efficiency and high efficiency air filters should be calculated as twice of the initial resistance.
In addition to the once through system and the system equipped with duty fan, the anti pouring measures should be taken to prevent the outdoor polluted air from entering the purification workshop through the new air outlet.
The return air should be reasonably used in the design of purified air conditioning system. When a large amount of harmful substances are produced in the process and the local treatment can not meet the sanitary requirements, or it is harmful to other processes, the return air shall not be used.
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