The Effects of Heat Exchanger on Ozone Retention

Abstract There has been an increase in consideringthe health and aviation safety problem related to bleed air contamination, such as ozone, with the continued growth of aviation transportation. In this paper, the DPM (Distributed Parameters Model) was employed and extended to numerically investigate the ozone spread in HX (Heat Exchanger), the key component of aircraftECS (Environmental Control System). The equation of mass conservation for each control volume was build, where the flux of the ozone deposited to the surface was determined by its local concentration in air and the deposition velocities, which refers to analogy analysis between mass transfer and heat transfer. The physical surface deposition and chemical reactions between ozone and heat exchanger were both studied with DPM to determine the ozone retention ratio, which could consider the effects of local flow and heat transfer condition with affordable computation burden.This study presented some numerical tools to analyze the ozone problem in airplane ECS and reveals that the ECS may have a significant effect on airplane ozone removal.