Abstract
Recently, buildings that adopted the external insulation method that is possible to take the thick insulation are widely prevalent in cold regions. While the reduction of heating load in winter is generally expected, the increase of cooling load in summer is concerned. So, it is necessary to devise the buildings and facilities like natural ventilation and solar control. The aim of this paper is to estimate the solar radiation load at every floor caused by incident light in skylighted void space. Therefore, we calculate the solar irradiance using ideas of luminous efficacy about the illuminance from the illumination distribution to every floor, and show details of solar radiation load at every floor by model experiment and numerical analysis.
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