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Low humidity in the aircraft cabin environment and its impact on well-being - Results from a laboratory study

机译：机舱环境中的低湿度及其对健康的影响-实验室研究的结果

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The impact of low humidity in the aircraft cabin environment on the human well-being has been analyzed comparing data from a laboratory subject study. Experiments were performed in a simulated aircraft environment at the Fraunhofer Flight Test Facility (FTF) where subjects were asked to vote their sensation and perception of the environment with respect to humidity as well as their perceived symptoms. The interior of the aircraft was maintained to give subjects a realistic impression of flying while the main environmental parameters have been varied and controlled: air pressure, air and fuselage temperature, relative humidity, background noise, ventilation rate, etc. 40 subjects experienced relative humidities of 10%-40% at a temperature range of 21 ℃-25 ℃ and atmospheric pressures between 753 hPa and ambient conditions. Based on the course of a 7 h long-haul flight the subjects answered questionnaires three times. In this paper the impact of low humidities on both, perceived comfort and symptoms, is analyzed. The percentage of subjects assessing the environment as dry is remarkably high at all levels of relative humidity. However, almost each of the estimated regressions is not significant on a level of 0.05 for all exposition phases. Thus direct relationships between perceived symptoms related to dryness as well as subjective assessment of dryness and relative humidities below 40% could not be drawn. At very low levels of relative humidity around 10% the perception of dryness decreases significantly between 90 min and 240 min after start of exposure.
机译：通过比较来自实验室研究的数据，分析了机舱环境中低湿度对人体健康的影响。实验是在Fraunhofer飞行测试设施（FTF）的模拟飞机环境中进行的，要求受试者对湿度和感知症状方面的环境感受和投票进行投票。飞机的内部得以保持，使受试者在实际飞行中获得了真实的印象，同时改变并控制了主要环境参数：气压，空气和机身温度，相对湿度，背景噪声，通风率等。40名受试者经历了相对湿度在21℃-25℃的温度范围内以及753 hPa与环境条件之间的大气压下，压力为10％-40％。基于7小时的长途飞行，受试者回答了3次问卷。本文分析了低湿度对舒适感和症状的影响。在所有相对湿度水平下，将环境评估为干燥的受试者的百分比都非常高。但是，对于所有博览会阶段，几乎每个估计的回归值在0.05的水平上都不显着。因此，无法得出与干燥有关的感知症状之间的直接关系以及对干燥和低于40％的相对湿度的主观评估。在极低的相对湿度水平（约10％）下，开始暴露后90分钟至240分钟之间，干燥感明显降低。

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