Practical study on heat stress reduction by parasols

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  • WATANABE Shinichi
    Department of Architecture, Faculty of Engineering, Daido University
  • ISHII Jin
    Department of Architecture, Faculty of Science and Technology, Meijo University

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  • 日傘による暑熱環境緩和効果の実証的研究
  • ヒガサ ニ ヨル ショネツ カンキョウ カンワ コウカ ノ ジッショウテキ ケンキュウ

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<p>A parasol is one of the preventive measures against heat illness. The objective of this study is to clarify the UTCI reduction of seven parasols with different materials and colors. Measurements were conducted at Daido University, Nagoya in July and August 2013. Air temperature, relative humidity, wind velocity, and upward and downward long and short-wave radiation fluxes were measured under the sun and parasols. Following findings were obtained through the measurements. The solar shading rates of the parasols were almost constant regardless of the solar radiation. The maximum solar shading rate was identified to be 99.7% for the white polyester (100%) parasol laminated with polyurethane film, and the minimum was 48.3% for the white polyester (65%) and cotton (35%) mixture parasol. Downward long-wave radiation fluxes from the parasols were increased with increasing solar radiation. The increase rate in long-wave radiation was larger for black parasols than for white parasols. At solar radiation of 1,000W/m2, the MRT under parasols was lower by 7.9°C to 15.0°C than in the sun. The maximum UTCI reduction was -3.7°C among the parasols tested at solar radiation over 800W/m2.</p>

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