Xingjuan Zhang

Synergistic Effect of Nanophotocatalysis and Nonthermal Plasma on the Removal of Indoor HCHO

Photocatalysis is an effective method of air purification at the condition of a higher pollutant concentration. However, its wide application in indoor air cleaning is limited due to the low level of indoor air contaminants. Immobilizing the nanosized TiO2 particles on the surface of activated carbon filter (TiO2/AC film) could increase the photocatalytic reaction rate as a local high pollutant concentration can be formed on the surface of TiO2 by the adsorption of AC. However, the pollutant removal still decreased quickly with the increase in flow velocity, which results in a decrease in air treatment capacity. In order to improve the air treatment capacity by the photocatalytic oxidation (PCO) method, this paper used formaldehyde (HCHO) as a contaminant to study the effect of combination of PCO with nonthermal plasma technology (NTP) on the removal of HCHO. The experimental results show that HCHO removal is more effective with line-to-plate electrode discharge reactor; the HCHO removal and the reaction rate can be enhanced and the amount of air that needs to be cleaned can be improved. Meanwhile, the results show that there is the synergistic effect on the indoor air purification by the combination of PCO with NTP.

Research on the Environmental Control System of the Equipment Bay for A High Altitude Long Endurance Solar-powered UAV

Substantial efforts have been focused on developing high altitude long endurance solar-powered unmanned aerial vehicles (LESP UAVs). With increasingly integrated and compact electronic equipment, the demand for effective heat dissipation becomes more critical but challenging. Aiming at LESP UAV’s equipment bay with the cooling capacity demand of 5kW, after the availability of heat sink is analysed, a single-stage and two-stage vapor compression refrigeration cycle based on radiation cooling are proposed. By using thermodynamic analysis and quality estimation, the corresponding quantitative relationship is obtained, and the variation between cooling capacity and power consumption/system weight are calculated. Combined with the engineering application, the suitable conditions of two schemes are given. The results can provide theoretical and engineering guidance for the research in this field, and have good engineering application value.