Investigation On The Performance Of Airliner Cabin Air Filter And Its Cleaning Efficiency Analysis For The Airline Cabin

Aircrafts emit large amounts of ultrafine particles, and the atmosphere containshigh concentration of PM2.5in fog/haze weather, and the particles will been taken intothe cabin through ventilation system; the passengers activities and baggage also emitparticles. So passengers face serious particle exposure danger. Different size particlescan deposit at different parts of the respiratory system and cause local damage. Toprotect passenger’s health, the recirculated air filter have been installed to clean thecabin air. And the performance of the cabin air filter will impact the IAQ in cabin, sowe must study the performance of aircraft cabin air filter.On the basis of EN1822and EN779, we established and improved the lifetimeperformance test method for airliner cabin air filter. For the efficiency test, wecombined SMPS with OPC to measure the particle filtration efficiency from10nm to3μm, so we can evaluate its filtration efficiency for all particles range from ultrafineparticles to PM2.5. The initial efficiency for three cabin filters are: Donaldson filter,80%for MPPS (100nm), Pall-1filter,99.75%for MPPS (125nm), Pall-2filter,96%forMPPS (130nm). For the dust loading test, A2dust and ASHRAE dust were selectedto load the same type of filter―Donaldson. The results show that the efficiency andpressure drop increase faster for Donaldson-2filter, and the Donaldson-2filter wasloaded with ASHRAE dust, while the Donaldson-1filter was loaded with A2dust.The size distribution data indicate that the diameter of ASHRAE dust is larger than A2dust, large particles block the fiber porous quickly. Donaldson filter and Pall filterloaded with ASHRAE dust, the efficiency and pressure drop of Pall filter increasedfaster than Donaldson filter. The Electron microscope photos show that the fiber sizedistribution of Pall filter is small than Donaldson filter, so it has larger filter packingdensity and filtration area. By using of a model, we calculated Pall-2filter’s pressuredrop throughout its lifetime. The results indicate that for the cabin filters installed inChinese flight, the pressure drop increased to7times of the initial pressure drop. Sothe “C check” time for filter exchange is not scientific.To evaluate the particle remove efficiency of cabin ventilation system, based onthe simulation chamber, we installed the cabin filter in the air conditioning unit, andutilization methods of recovery time measurement, we generated aerosol, mixed, decayed, and used CADR as the evaluation index. For0.5μm~3μm particle numberand PM2.5particle mass concentration, the CADR are16m3/min and25m3/min,respective, it’s mean that the equivalent remove efficiency are53%and83%,respective. It’s lower than filter efficiency. On the other hand, CADR is positivecorrelation with airflow and particle diameter.This study has some theoretical significance and practical significance fordevelopment and optimization of cabin high efficiency filters. And provide basementdata for improve cabin air quality.