Effects of extremely low humidity on comfort and fatigue of Japanese occupants

Hitomi Tsutsumi, Yoshitaka Hoda, Hayato Ohashi, Yuta Ezaki, Junkichi Harigaya, Shinichi Tanabe, Toshihiko Ishizawa

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    Subjective experiments were carried out in a climate chamber using Japanese subjects, in order to evaluate human comfort at very low humidity. Two levels of absolute humidity were set. Three air temperature conditions for each absolute humidity level were examined. People were exposed in a chamber for 90 minutes with sedentary activity. Subjective break up time got significantly shorter at extremely low absolute humidity. Air temperature had great impact on subjective general humidity sensation under the conditions set for this experiment. General dryness sensation at low absolute humidity was significantly greater than that at high absolute humidity with same air temperature. Subjects felt their eyes were dryer at low air temperature at the same moisture content in air. In case of the constant air temperature, low absolute humidity caused greater eye dryness sensation. Subjective humidity discomfort of females was greater than male. Very low humidity air dry up the human mucous membrane. Half of subjects perceived their palm of hand as wetted segment even at extremely low humidity. They could feel more tired at low humidity under the cool and thermally neutral condition, while they complained more at high humidity in hot environment. It was found that females tended to be more tired than males even under the same condition.

    Original languageEnglish
    Title of host publicationIAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment
    Pages167-174
    Number of pages8
    Volume1
    Publication statusPublished - 2007
    Event6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007 - Sendai
    Duration: 2007 Oct 282007 Oct 31

    Other

    Other6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007
    CitySendai
    Period07/10/2807/10/31

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    Keywords

    • Comfort
    • Extremely low humidity
    • Fatigue
    • Subjective experiment

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Renewable Energy, Sustainability and the Environment

    Cite this

    Tsutsumi, H., Hoda, Y., Ohashi, H., Ezaki, Y., Harigaya, J., Tanabe, S., & Ishizawa, T. (2007). Effects of extremely low humidity on comfort and fatigue of Japanese occupants. In IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment (Vol. 1, pp. 167-174)