Purification renovation of air conditioning system in an existing office building

Taking the purification renovation project of the air conditioning system in an existing office building as an example, puts forward the renovation schemes of fan coil unit and outdoor air handling unit by analysing the actual demand of the project. Determines the design concentration baselines of indoor and outdoor PM2.5, as well as the formula for the filter efficiency of the outdoor air handling unit, and concludes that the permeate air change rate and the outdoor air rate per capita are the factors impacting on the filter efficiency selection of the outdoor air handling unit. Through a comprehensive comparative analysis on the advantages and disadvantages of different filter schemes of outdoor air handling unit, selects a scheme combining the G4 filter, the electrostatic filter and the F8 filter. Presents the reconstruction measures and methods from the aspects of building loophole plugging, air conditioning system cleaning, fine operation and so on.