Measurement of Solar Shading Factor to Human Projected Area with a Parasol

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  • 日傘による直達日射の人体投射面積遮蔽率
  • ヒガサ ニ ヨル チョクタツ ニッシャ ノ ジンタイ トウシャ メンセキ シャヘイリツ

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Abstract

Persons using a parasol are exposed to complicated radiation environments in outdoors. A part of the human body is irradiated with intense solar radiation, while the other part is blocked it with a parasol. This study intends to determine a solar shading factor of the human projected area for direct solar radiation with a parasol. Measurements were performed on a roof of a five-story building in summer. Three college-aged female subjects were participated in the measurements. They wore their own casual clothes and parasols. The subject was asked to stand facing to the sun with/without the parasol to take an image of shadow casting on the horizontal surface. After having corrected image distortion using the image-processing software, the projected areas of the human body with/without the parasol were obtained. The solar shading factor of the human projected area with a parasol increased with increasing solar altitude. The subject's azimuth to the sun and holding position and angle of a parasol affect the solar shading factor of the human projected area. The equation estimates the solar shading factor of the human projected area with a parasol from the solar altitude.

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