Influence of temperature and humidity of ambient air on sensation of dryness during respiration

To create an optimal indoor thermal environment, it is necessary to identify the environmental conditions that cause a sensation of dryness. Dryness is experienced in various parts of the human body such as the nose, mouth, throat, eyes, and skin: this study focuses on dryness in the airway. The rel...

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Bibliographic Details
Published inJournal of the Human-Environment System Vol. 23; no. 1; pp. 31 - 43
Main Author Takada, Satoru
Format Journal Article
LanguageEnglish
Published Nagoya Japanese Society of Human-Environment System 2020
Japan Science and Technology Agency
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ISSN1345-1324
1349-7723
DOI10.1618/jhes.23.31

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Summary:To create an optimal indoor thermal environment, it is necessary to identify the environmental conditions that cause a sensation of dryness. Dryness is experienced in various parts of the human body such as the nose, mouth, throat, eyes, and skin: this study focuses on dryness in the airway. The relationship between the sensation of dryness and environmental factors such as the ambient air temperature and humidity (vapor pressure) was analyzed based on experiments performed on four subjects. This study analyzed the sensation of dryness experienced in six parts along the respiratory tract and the temperature of air inhaled/exhaled at the airway aperture of each of the four subjects under different conditions of humidity and temperature maintained in an artificial climate chamber. The route of respiration was restricted to the nose or the mouth by blocking the other aperture. The experimental results revealed that the temperature of exhaled air was lower and the sensations of dryness in the nose, mouth, and throat were more intense in the case of low humidity under a constant temperature. These results suggest that an increase in the evaporation rate in the airway may cause a sensation of dryness. Further, the experimental results revealed that in the case of high temperature and constant vapor pressure, the sensation of dryness tended to be more intense. This suggests that higher ambient temperature increases the evaporation rate in the airway owing to the increase in the saturated vapor pressure in the inner surface of the airway.
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ISSN:1345-1324
1349-7723
DOI:10.1618/jhes.23.31