屋上緑化による夏期の建築物および都市の熱負荷の軽減効果の実証的研究 Practical Study on the Effect of the Plants on the Roof of a Building to Reduce the Heat Absorption of the Building and the Urban Area

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Abstract

建築物の屋上を緑化することによる夏期の建築物および都市の温熱環境の改善効果を把握するために, 1993年夏に計測実験を行った.東京都内の9階建てビルの低層棟 (5階建て) の屋上を対象として, カンツバキの植栽地, 舗装面, 机で日陰を作った舗装面の3箇所の温熱環境の違い, 植栽地の葉面からの蒸散速度等の測定を, 8月2日の曇天日と8月12日の晴天日に行った.その結果, 夏の強い日差しを受けた8月12日には, 日射を受ける舗装面では表面温度の上昇も建築物への熱流量も非常に大きく, それぞれの最大値が56.6℃, 507W/m<SUP>2</SUP>に昇った.机で日射から遮蔽された舗装面では表面温度の上昇は相当緩和されて最高が32.6℃にしかならず, 建築物への熱流量は日中でおおむね50W/m<SUP>2</SUP>程度であった.それに対して植栽地では, 植物による日射の遮蔽と葉からの蒸散による潜熱消費により, 地表面温度の上昇が大きく抑えられ, 14時前後に日陰舗装面よりも高くなった以外は日陰舗装面よりも相当低く, 建築物への熱流量も最高で33W/m<SUP>2</SUP>とごくわずかであった.

A measurement experiments were done in order to examine the effect of planting on the roof of a building to suppress the increase of surface temperature in summer of 1993. The data of thermal environment such as temperature, heat flux, etc. were continuously measured by machine at 3 typical points (the area planted with shrubs, the pavement within shade of a table and the pavement without shade). Also other data such as leaf transpiration rate etc. were measured by man power on the cloudy day of August2 and the fine day of August 12. At the pavement without shade, the surface temperature (maximum56.6°C) and the heat flux from outside toward the roof of the building (maximum507W/m<SUP>2</SUP>) were the highest among3typical points. At the pavement with shade, the surface temperature was fairly law (maximum32.6°C), but the heat flux was still big (maximum 121W/m<SUP>2</SUP>). On the other hand, at the planted area, the temperature was lower than the shaded pavement except around14: 00and the heat flux was very small (maximum33W/m<SUP>2</SUP>) by the effect of cutting sun beam, and the transpiration from leaves.

Journal

  • Journal of the Japanese Society of Revegetation Technology

    Journal of the Japanese Society of Revegetation Technology 20(3), 168-176, 1994

    The Japanese Society of Revegetation Technology

Cited by:  14

Codes

  • NII Article ID (NAID)
    110002939002
  • NII NACSIS-CAT ID (NCID)
    AN10130633
  • Text Lang
    UNK
  • Article Type
    Journal Article
  • ISSN
    0916-7439
  • Data Source
    CJPref  NII-ELS  J-STAGE 
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