The Influence of the Solar Radiation Absorptivity up on the Outdoor Thermal Environment Evaluation Index and the Thermal Sensory Perceptions

Abstract

When the thermal environment is under heated conditions, short-wavelength solar radiation shows a strong influence on the human body and the heat is accumulated in the human body. In order to demonstrate the effect of the short-wavelength solar radiation absorptivity of clothing on physiological temperature in an outdoor space, the relationship between the thermal environment evaluation index, ETFe, and the thermal sensory perceptions of the human body was investigated. A significant temperature difference of 2.7˚C was shown for an ETFe that was thermally neutral (neither hot nor cold). The effect of short-wavelength solar radiation absorptivity was strongly apparent in ETFe when direct solar radiation was strong and in warmer outdoor spaces. In an outdoor space where the effect of the sky factor and albedo was strong, the setting of the short-wavelength solar radiation absorptivity was demonstrated to greatly impact the estimation of perceived and physiological temperature. When interviewing subjects on clothing in an outdoor space, it is essential to obtain the hue of clothing.

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“…Short wavelength solar radiation heat transfer is impacted by solar radiation absorptivity. Kurazumi et al [40] projected the impact of short wavelength solar radiation absorptivity in outdoor spaces on perceived body temperature when sky factors and albedo are also high. According to VDI3787-2 [41], solar radiation absorptivity is approximately 0.7 for clothed skin.…”

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“…According to the American Scientific Society for Heating, Cooling and Air Conditioning (ASHRAE, American Society of Heating, Refrigerating and Air Conditioning), thermal comfort is defined as the psychosomatic state in which a person desires no thermal change in the indoor environment and is satisfied with the prevailing thermal conditions [27].…”