| Summary: | 碩士 === 中國科技大學 === 建築研究所 === 96 === In Taiwan, proper sunshade devices can effectively block the sun radiation from entering the room and lower indoor temperature, and save ±20% energy on air conditioning. However, sunshade devices would also lower the indoor illumination by 20~58%. This study discusses the use of sunshade device to reduce the sun radiation at the opening parts of building, and the indoor natural lighting effect.
This study installed sunshade device in Taiwan (north latitude of 23 and east longitude of 120). Two types of sunshades were installed, including blind cornice and horizontal blind sunshade panel. Light Scape computation was employed to analyze the affecting factors, such as elevation angle and azimuth of sunlight source, frequency of window opening, and different depths and angles of photovoltaic sunshade devices, in order to compute the photoconversion efficiency.
The results showed that, the illumination of opening toward south and within 500cm of the opening position could reach 300lux, and area beyond this range requires artificial lighting. Because of the elevation angle and azimuth of sunlight source, under the same condition, the natural lighting effect and photoconversion efficiency of blind cornice is better than that of horizontal blind sunshade panel. When the angle of the blind cornice changes (not 0°), the sunlight would reach inside of the room through the gaps between the sunshade panels and form diffusive light, so as to increase the natural lighting area indoor. It is more obvious when the window opening frequency is over 30%. Thus, movable photovoltaic sunshade panel can adjust angle according to the elevation angle of sunlight, and have excellent photoconversion efficiency without interfering with the indoor natural lighting effect. The horizontal blind sunshade panel used in this study has inferior photoconversion efficiency, and has poor indoor natural lighting effect and view when the sunshade angle is larger than 30°.
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