高原弥散供氧建筑室内氧气回收的风量平衡特性研究
Study on air volume balance characteristics for oxygen recovery in plateau diffusion oxygen supply buildings
摘要：
针对当前弥散供氧建筑中氧气利用率低、资源浪费严重的问题,提出在高原民用建筑中通过氧气回收提高氧气利用率的弥散供氧模式。通过数值模拟与实验验证,对弥散供氧建筑氧气回收的风量平衡特性进行了研究,分析了流速、管径及大气压力对该供氧模式节能效果的影响。结果表明:室内各风量的匹配关系等因素对出口氧气浓度和氧气节约率具有显著影响;在不同海拔下,机械供氧-氧气回收比的范围存在差异,随着海拔升高,该比值呈增大趋势,总体而言,该比值的最佳范围为0.27～1.84;在室内风量平衡状态下(总风量100%),当氧气回收量每增大1%时,回风量增大3%,新风量减小1%,排风量减小3%;出口氧气浓度在90%以上,氧气节约率可达40%以上。
Abstract：
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%.
Keywords:high-altitude area; diffusion oxygen supply; oxygen recovery; air volume balance; ratio of mechanical oxygen supply to oxygen recovery; oxygen concentration; oxygen saving rate; oxygen utilization rate