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What is a Fan filter unit(FFU) in cleanroom?FFU is an abbreviation for FAN FILTER UNITFFU can be used modularly (or individually of course.) FFU are widely used in clean rooms, clean benches, clean production lines, assembled clean rooms, and partial class 100 clean rooms. The FFU is equipped with two levels of primary and high-efficiency filters. The FFU consists of four main parts. There are two common cleanroom air treatment methods, MAU + AHU + HEPA (hereinafter referred to as AHU system) and MAU + FFU + DC dry coil (hereinafter referred to as FFU system). By comparing the two methods it is concluded that the FFU acts as a purification circulation unit in the purified air conditioning system and the circulating air volume in the clean room is equal to the total air volume of the FFU in the clean room. The air in the clean room is sent into the clean room from the clean ceiling mezzanine by the FFU, and the circulating air is sent back to the ceiling mezzanine through the return air mezzanine; the circulating air exchanges heat with the DC dry coils installed in the mezzanine as it passes through the return air mezzanine. FFU features and applicationsFeatures of FFU: low energy consumption, low noise, convenience and flexibility, space-saving, and easy installation.Low energy consumption: from the perspective of the components of FFU, only the micro fan needs to consume energy, and the power of the micro fan is generally between 110w and 190w. Although the initial investment is higher than using duct ventilation when choosing FFU, it stands out in the later operation as energy-saving and maintenance-free. Usually, clean room circulation air volume is very large, to the area of 100m2, clean room height for 3m, air cleanliness level requirements for ISO6 (i.e. 1000 level) clean room as an example: "clean plant design specifications (GB500073-2001)" for ISO6 clean room air cleanliness level for the number of air changes for 50 times / 60 times / h. We take the air change here. Here we take the number of air changes as 55 times/h, the total circulating air volume of FFU is 16,500 CMH, and we take the fresh air volume as 3,000 CMH. Scheme 1, AHU system: the total pressure loss of MAU is 700Pa and the power is 2.2kw; the total pressure loss of AHU is 1300Pa and the power is 15kw; the total power of the whole system is 17.2kw. Scheme 2, FFU system: the total pressure loss of MAU is 800Pa and the power is 2.2kw; the specification of FFU is 1200×600 and the air volume is 1200CMH) there are 14 FFUs, the power of a single FFU is 190W, the total power of FFU is 2.66kw; the total power of the whole system is 4.86kw. By comparing the power of schemes 1 and 2, we conclude that the FFU acts as a collection of circulating air cabinets and high-efficiency filters in the system, and the power consumed is much smaller than that of the circulating air cabinets AHU, which is in line with the current theme of vigorously promoting an economical society and giving the factory a new direction in saving production costs. |
