People Susceptible to Heat and Their Residential Thermal Environments in Summer

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  • OHNAKA Tadakatsu
    Department of Living Environmental Science, Faculty of Human Environmental Science, Fukuoka Women's University

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  • 暑がりを自覚する者が居住する夏季の住宅温熱環境調査
  • ショガリ オ ジカク スル モノ ガ キョジュウ スル カキ ノ ジュウタク オンネツ カンキョウ チョウサ

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The purpose of this study was to clarify the physiological and subjective responses to heat of people who made a self-assessment of being sensitive to the heat, and their methods of coping with the heat in their homes during the summer. A field survey of the thermal environment of subjects was performed at their homes in the summer. The subjects were divided into two groups of 10 young females (21 to 23 years), a sensitive to heat (HS) group and a non-sensitive to heat (NS) group. The thermal conditions of each subject's house were measured every two minutes for a week, and skin temperatures of the subjects at 7 sites (forehead, chest, forearm, hand, thigh, calf, foot) were also measured using a radiation thermometer every hour while they were at home. Thermal sensation and clothes worn were recorded at times of skin temperature measurements. There were significant relationships between ambient temperatures and thermal sensations in both groups. The regression coefficient (slope) of the HS group's regression line was smaller than that of the NS group's significantly (P<0.01). Subjects in the HS group reported being "slightly sweaty" at 30.2℃ room temperature, which was 0.5℃ significantly lower than that in the NS group (P<0.05). The room temperatures which subjects evaluated as "no change " in the preference sensations were 27.9℃ for the HS group and 28.5℃ for the NS group respectively, showing a significant difference at P<0.01. The clothes worn in houses were 0.27 clo in the HS group and 0.25 clo in the NS group, although this difference was not statistically significant. Subjects in the HS group were sensitive to the heat and obtained thermal comfort in cooler thermal conditions. They had a tendency to establish comfortable thermal conditions using air-conditioning even under the conditions of wearing light clothes in summer.

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