The airport is the guest's first impression of the city and the first place for the host to appear. The airport air-conditioning system naturally took the best local and then configuration. The airport air-conditioning system showed the strength of the host and the level of the air-conditioning designer.
In the air-conditioning systems of large airports in developed countries, the common configuration of air filters is:
G4 ～ F6 pre-filter → activated carbon filter → F7 end filter
F7 filter (Ashrae Dust-spot 85%) is the most common filter in high-grade public places. After the F7 filter, the dust concentration in the air can reach the level of tourist attractions. Unless you have a lot of money, there is no need to further improve the filtration efficiency to F8. National standards stipulate that the upper limit of the concentration of inhalable particulate matter in the terminal is 0.15mg / m3, which is a minimum requirement from a health point of view. This concentration is equivalent to level 2 of atmospheric pollution, and the outdoor air in airports is lower than this concentration. In the design, airport air conditioners consider the grade, not just the health. In addition, if the interior decoration of the terminal is required to be new for many years, the F7 filter should be considered when designing.
The airport smells of petrol, and although most guests won't complain, the host still has to hide it. Therefore, odor-removing activated carbon filters have become a standard feature in airport air conditioners in developed countries. There isn't much technology at all here, just the grade. If the filter is a luxury in air conditioning, the activated carbon filter is the best, it tests the strength of airport investors and operators.
The role of the pre-filter is to protect the air-conditioning system and extend the service life of the end filters. If one pre-filtration is not enough, two can be set; if the pre-filter is required to have a long service life, a filter with a large filtering area can be selected. As long as the filtration efficiency is reasonable, there are not many other choices for the selection of the pre-filter. It only requires that it has a sufficient service life, easy replacement, convenient supply, and low price.
In the domestic airport projects of the 1990s, there were a lot of works in architecture and interior decoration. Sometimes you feel that our front door is more elegant than developed countries. Chinese people pay attention to "good steel is used on the blade, and good powder is applied to the face." However, people cannot see the air conditioner, and its status can not even turn the blade back, so it is often simplified because of cost. In the initial planning of Shanghai Pudong Airport air-conditioning system, there was an activated carbon filter with an F7 filter at the end, but the activated carbon was cut off first in the engineering design. In a further design, the F7 at the end was reduced to F5. The filters used in the Beijing Airport Terminal are even lower than Pudong. At present, the highest grade of domestic airport filter is Phoenix Airport in Sanya, Hainan. It is designed by foreigners. The main filter efficiency is F7. Because it is a small airport and does not have so much gasoline smell, no activated carbon filter is set.
In 2002, the new terminal of Xi'an Xianyang Airport selected activated carbon filters. This is the first terminal in China to use activated carbon filters. The disadvantage is that the efficiency specification of ordinary filters in that project was only G4. We have the strength to forge the whole steel knife with steel, not just to insert the blade. In the next round of airport construction projects, F7 filters will be the mainstream of end filters, and activated carbon filters will also become a regular configuration for large airports.