Fundamental Research for Indoor Humidity Control Using Skin Appearance as Evaluation Index

SUZURI Aika, TAKADA Satoru

doi:10.24538/jhesj.29.2_45

<p>Indoor humidity tends to be low in winter. In indoor environment control and design, it is important to clarify the minimum humidity that can maintain human health and to suppress unnecessary humidification. This study focuses on the appearance of the skin as one of the indicators to measure human health, clarifies the relationship between the appearance and the humidity by subject experiments, and seeks to obtain basic knowledge for a new evaluation method. For 5 subjects, the skin on the back of the left hand was exposed to a step change in humidity ratio. First, the skin microscopic image was taken and the skin moisture content was measured continuously, and when the humidity decreased, the width of the skin groove became wider (the texture became rougher) and the skin moisture content decreased almost at the same time. The equilibrium was almost reached within 5 to 10 minutes after the humidity change. Next, the shape of the skin groove under each humidity condition was compared by the skin replica method. While the change in the depth of the skin groove due to the decrease in humidity was not observed clearly, the number of skin grooves decreased, and the skin anisotropy increased.</p>

Fundamental Research for Indoor Humidity Control Using Skin Appearance as Evaluation Index

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