Physiological and subjective responses while touching feet on cooled floors under warm air conditions

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  • 温暖な環境下での冷却された床接触時の生理・心理反応
  • オンダン ナ カンキョウ カ デ ノ レイキャク サレタ ユカ セッショクジ ノ セイリ シンリ ハンノウ

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Abstract

Air conditioning is widely used as a cooling system and is mainly dependent on convection. The aim of this study is to investigate the physiological and subjective responses of humans while their feet are in contact with cooled floors, and to discuss the possibility of using a floor cooling system as a practical cooling method. Subjects were exposed to four thermal conditions for 90 minutes in a sitting position. The thermal conditions consisted of combinations of air (Ta) and floor (Tf) temperatures: 1:Ta 26℃ with Tf 24℃, 2:Ta 28℃ with Tf 26℃, 3:Ta 30℃ with Tf 28℃, 4:Ta 30℃ with Tf 26℃. Tympanic temperature and skin temperatures at 15 sites, heart rate and blood pressure were measured as physiological parameters. Thermal and comfort sensations, and preference for thermal conditions were recorded. There were no significant differences among the conditions in tympanic temperatures before and after exposure. Skin temperatures were higher under higher air temperature conditions, however, those were not affected significantly by floor temperatures. There were no significant differences in heart rate and blood pressure among the thermal conditions. Thermal comfort and/or thermal neutrality were obtained in the conditions of Ta 26℃ with Tf 24℃ and Ta 28℃ with Tf 26℃, but not in 30℃ Ta conditions even with floors cooled to 26.℃.

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