対流・放射連成解析による通気層を有する二重屋根の遮熱特性に関する検討

概要

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Direct Solar Radiation during daytime is the greatest contributor to the indoor heat load for cooling in hot and humid area in summer. Since the roof surface is the forefront recipient of the solar radiation, it is reasonable to think of providing second roof above in terms of "Sun Umbrella Concept", with ventilating air gap in between, to cut down the heat load for cooling caused by direct solar radiation. This research therefore, examines how indoor heat load for cooling and indoor thermal environment can be improved by the adaptation of the double roofing system, involving the air passage (space formed between the main roof and the second roof above) by the method of coupled simulation of convection and radiation. The analysis results of the convective heat transfer coefficient, heat fluxes (convection, radiation, conduction), and surface temperature in the air passage are shown, and the basic heat transfer mechanism and characteristic of the double roofing system are examined.In the simulation, in order to demonstrate the performance of the thermal shielding effect of the double roofing structure, it is necessary to keep the aspect ratio of the air passage not less than 0.1,and to keep the wind velocity at the building height more than 1.0 m/s.
社団法人日本建築学会の論文
2002-06-30