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- W2912262248 abstract "Recently, corneal illuminance attracts much attention because it is closely related to important functions of indoor lighting. Especially, applying circadian light in the built environment places a challenging requirement on indirect corneal illuminance. In this work, rule-of-thumb equations are proposed to guide circadian lighting design: (i) for artificial lighting, Ecor,avg (i) = (Φ/C1) · ρ/(1−ρ′), where Ecor,avg (i) is the average indirect corneal illuminance at standing or sitting positions, Φ is the initial flux from luminaires, C1 is a constant comparable to the total room surface area, ρ is the reflectance of the surface where the first reflection occurs, and ρ′ is the area-weighted average of surface reflectance; and (ii) for daylighting, Ecor,avg (i) = C2 · WWR · ρ/(1−ρ′), where C2 is a constant, and WWR represents the window-to-wall ratio.The equations above are validated by comparing against numerical simulation data obtained with the Radiance software. For artificial lighting simulation, various combinations of room surface reflectance, initial light distribution, and WWR are investigated; and for daylighting simulation, different combinations of surface reflectance, WWR, and geographic location are analyzed. The good fits to simulation data indicate that the proposed simple equations can provide reasonably accurate results for quick feedback at the field. It is also demonstrated that room surface reflectance has a dominant impact on indirect corneal illuminance. The approach of improving surface reflectance is more favorable than increasing luminaire flux or expanding window area, and therefore should be the recommended approach to achieve quality and efficient circadian lighting." @default.
- W2912262248 created "2019-02-21" @default.
- W2912262248 creator A5060028090 @default.
- W2912262248 date "1995-07-01" @default.
- W2912262248 modified "2023-09-25" @default.
- W2912262248 title "Daylighting in architecture: A European reference book" @default.
- W2912262248 doi "https://doi.org/10.1016/0038-092x(95)90020-g" @default.
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