Study on air volume balance characteristics for oxygen recovery in plateau diffusion oxygen supply buildings

In view of the current problems of low oxygen utilization rate and serious resource waste in diffusion oxygen supply buildings, this paper proposes a diffusion oxygen supply model to improve oxygen utilization rate through oxygen recovery in plateau civil buildings. Through numerical simulation and experimental verification, the air volume balance characteristics of oxygen recovery in diffusion oxygen supply buildings are studied, and the effects of flow rate, pipe diameter and atmospheric pressure on the energy-saving effect of this oxygen supply model are analysed. The results show that the factors such as the matching relationship of indoor air volumes have a significant impact on the outlet oxygen concentration and oxygen saving rate. The range of the ratio of mechanical oxygen supply to oxygen recovery is different at different altitudes, and with the increase of altitude, the ratio increases. Overall, the optimal range of the ratio is 0.27-1.84. Under the balanced indoor air volume (total air volume 100%), when the oxygen recovery volume increases by 1%, the return air volume increases by 3%, the outdoor air volume decreases by 1%, and the exhaust air volume decreases by 3%. The outlet oxygen concentration is above 90%, and the oxygen saving rate can reach more than 40%.