| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide energy-saving indoor lighting by joint use of solar light and a lighting fitting in existing houses. <P>SOLUTION: From an electric energy generated by an outdoor solar cell of a house 1 which is measured by a generated electric energy measuring means 7, an average illuminance per unit area and unit time of solar light irradiated on the house 1 is calculated by a solar irradiation calculating means 21A. Taking into consideration the relationship between the altitude and azimuth of the sun relative to the house 1 which changes depending on the time and season and which is calculated by a solar position calculating means 21B, the installation azimuth of the window 1a of the house 1 previously memorized, and the opening area of the window 1a of the house 1 previously memorized; an average illuminance per unit time of solar light incident indoor from the window 1a is calculated by an irradiance calculating means 21C. Based on these, a light control means 21D controls the dimming of the lighting fitting 13 by a lighting dimming means 15 so that the indoor illuminance becomes an optimum one previously memorized. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
