Abstract：

Analyses the applicability of task air supply to space station cabins and determines the evaluation indexes. Establishes physical and mathematic models, analyses the effect of different ventilation rates and supply velocities on air quality in the crew working area. Obtains the distribution of CO₂ concentration, air age, air fresh degree ratio, spot air change efficiency and air speed in the working area, and compares the results with that without-task air supply. The results show that by the task air conditioning system smaller air volume supplied can meet the air quality requirement in line with the principle of lighter mass of the spacecraft, and that the evaluated indexes in the working area are better with large task ventilation rate on condition that total air volume remains the same, and that the larger supplied air speed in the working area has released the stuffy sense on condition that the task air supply volume remains the same.