背景:在致力于医疗保健的低能耗建筑中，可以通过减少每小时换气次数（ACH）和隔离单元中保持的负压差来寻求节能。患者佩戴的氧气面罩与高流量氧气供应相连，可能是感染性气溶胶的潜在来源。本研究调查了健康志愿者在不同氧气流速下最常用的呼吸辅助装置、鼻套管和简单氧气面罩产生的羽流。方法:使用阴影成像系统观察11名健康志愿者（5名女性，34.0+/-13.2岁；6名男性，28.7+/-6.9岁）在不同供氧率下佩戴鼻套管或简单氧气面罩产生的呼气羽。从数字化阴影图像中测量每个流速、每个面罩、每个志愿者的最大水平传播距离。 引文:IAQ会议:IAQ 2013:低能耗建筑中的环境健康

Background: In low energy buildings dedicated to healthcare, energy savings may be sought by reducing the numbers of air changes per hour(ACH), and the degree of negative pressure differentials maintained in isolation units. Oxygen masks worn by patients and connected to highflowoxygen supplies may be a potential source of infectious aerosols. This study investigates the plumes generated by the most commonly usedrespiratory assist devices, nasal cannulae and simple oxygen masks, at different oxygen flow rates in healthy volunteers.Methods: A shadowgraph imaging system was used to visualize exhalation plumes generated by 11 healthy volunteers (5 females, 34.0+/-13.2;6 males, 28.7+/-6.9 years), wearing a nasal cannula or a simple oxygen mask at different oxygen supply rates. Maximum horizontaldissemination distances were measured for each flow rate, for each mask, for each volunteer, from digitized shadowgraph images.