Reduction of Solar Heat Gain of Building, Urban Area and Vending Machines by High Reflective paint

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  • 高反射率塗料による日射熱負荷軽減とヒートアイランド現象の緩和に関する研究
  • コウハンシャリツ トリョウ ニ ヨル ニッシャ ネツフカ ケイゲン ト ヒートアイランド ゲンショウ ノ カンワ ニ カンスル ケンキュウ

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The cooling load of buildings is largely influenced by the heat gained from solar radiation. Therefore, the reduction of solar heat gain is very effective to decrease the energy consumption of buildings. In this paper, the effects of the solar reflectivity of the roof and the outer walls on the indoor temperature and the cooling load are studied with experiments and numerical simulations. When the reflectivity of the building roof was raised up to about 85% with the high reflective paint, the experimental data showed that the indoor temperature decreased remarkably. The air-conditioning annual loads of various types of buildings, such as gymnasiums, storage spaces, offices, factories and residential houses, were calculated. Especially in hot region, such as Okinawa and Kyusyu, the cooling load is greatly reduced with the high reflective paint. On the other hand, the heating load increased when the high reflective paint was applied, in cool regions, such as Hokkaido, the total annul load becomes rather large. In the point of view about urban climate, the reduction of solar heat gain is very important to restrain the heat island phenomenon. In this paper the urban temperature was simulated with a one-dimensional heat budget model of an urban area, and the effects of high reflective paint (high albedo paint) was evaluated when the paint was applied to 20% of total building roof area on the urban ground surface. In this paper the efficiency of high reflective paint was also evaluated experimentally and numerically when it was applied to vending machines installed out-of-doors.

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