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Impacts of humidification process on indoor thermal comfort and air quality using portable ultrasonic humidifier

机译：便携式超声波加湿器加湿过程对室内热舒适度和空气质量的影响

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摘要

Human exposed to low level of indoor humidity will have dryness (for skin, pharyngeal, eye etc.) or respiratory symptoms, which are closely related with indoor thermal comfort and air quality. To increase indoor humidity, portable humidification facilities (e.g., ultrasonic humidifiers) are widely applied in residential buildings due to their economy and convenience. Most of the available indoor humidity-related studies were associated with health issues induced by humidity and airborne pollutants generated by humidifier. However, the studies are rarely focusing on the effects of unsteady humidification (water vapor and droplet-induced from portable humidifier) on indoor thermal environment (i.e., air temperature, humidity, thermal comfort) and indoor air quality (e.g., TVOC, particles). Thus, this work aimed to investigate the impacts of humidification process on indoor environment by experiments in an isothermal chamber. The results show that portable ultrasonic humidifier increased humidity and decreased temperature simultaneously. The unsteady air temperature curve had "ladder-like" pattern. If RH increased from 34% to 60%, air temperature and PMV (Predicted Mean Vote) were decreased by 1.5 degrees C and 0.2 respectively. The obvious spatial stratification phenomenon was observed for both temperature and humidity field. We also found the obvious decrease of PM and TVOC concentrations during the entire humidifying process. Compared to traditional steam humidification system, indoor portable ultrasonic humidifier could save 70% of energy consumption and 18% of exergy loss. These qualitative characteristics of indoor humidification process would facilitate for indoor humidity control in the perspectives of human health and thermal comfort.
机译：暴露于低水平室内湿度的人体会出现干燥（皮肤，咽喉，眼睛等）或呼吸道症状，这与室内热舒适度和空气质量密切相关。为了增加室内湿度，便携式加湿设备（例如，超声波加湿器）由于其经济性和便利性而广泛用于住宅建筑物。大多数与室内湿度有关的可用研究都与湿度和加湿器产生的空气传播污染物引起的健康问题有关。但是，研究很少关注不稳定的加湿（便携式加湿器引起的水蒸气和水滴引起）对室内热环境（例如，气温，湿度，热舒适度）和室内空气质量（例如，TVOC，颗粒物）的影响。 。因此，这项工作旨在通过在恒温室内进行实验研究加湿过程对室内环境的影响。结果表明，便携式超声波加湿器可同时提高湿度和降低温度。不稳定的空气温度曲线具有“阶梯状”图案。如果RH从34％增加到60％，则气温和PMV（预测平均投票）分别降低了1.5摄氏度和0.2摄氏度。在温度和湿度场上均观察到明显的空间分层现象。我们还发现，在整个加湿过程中，PM和TVOC浓度明显降低。与传统的蒸汽加湿系统相比，室内便携式超声波加湿器可节省70％的能源消耗和18％的火用损失。从人类健康和热舒适性的角度来看，室内加湿过程的这些定性特征将有助于室内湿度的控制。

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