Area Lighting / Lighting technology, day lighting IEV ref 845-09-72 Symbol c en configuration factor (between two surfaces S1 and S2) ratio of the irradiance or illuminance at a point on surface S2 (or S1) due to the flux received from surface S1 (or S2), to the radiant or luminous exitance of surface S1 (or S2) ${c}_{21}=\frac{{E}_{2}}{{M}_{1}}$ ; $\text{\hspace{0.17em}}{c}_{12}=\frac{{E}_{1}}{{M}_{2}}$ unit: 1 NOTE: The relation between the configuration factor c and the (mutual) exchange coefficient g is: ${\int }_{{A}_{2}}{c}_{21}\text{ }\text{ }\text{d}{A}_{2}=\frac{{\int }_{{A}_{2}}{E}_{2}\text{ }\text{d}{A}_{2}}{{M}_{1}}=\frac{{\Phi }_{2}}{{M}_{1}}=g=\frac{{\Phi }_{1}}{{M}_{2}}=\frac{{\int }_{{A}_{1}}{E}_{1}\text{ }\text{d}{A}_{1}}{{M}_{2}}={\int }_{{A}_{1}}{c}_{12}\text{ }\text{d}{A}_{1}$ fr facteur de configuration (entre deux surfaces S1 et S2) m rapport de l'éclairement énergétique ou lumineux en un point de la surface S2 (ou S1) dû au flux reçu de la surface S1 (ou S2), à l'exitance énergétique ou lumineuse de la surface S1 (ou S2) ${c}_{21}=\frac{{E}_{2}}{{M}_{1}}$; $\text{\hspace{0.17em}}{c}_{12}=\frac{{E}_{1}}{{M}_{2}}$ unité : 1 NOTE: La relation entre le facteur de configuration c et le coefficient d'échange mutuel g est: ${\int }_{{A}_{2}}{c}_{21}\text{ }\text{ }\text{d}{A}_{2}=\frac{{\int }_{{A}_{2}}{E}_{2}\text{ }\text{d}{A}_{2}}{{M}_{1}}=\frac{{\Phi }_{2}}{{M}_{1}}=g=\frac{{\Phi }_{1}}{{M}_{2}}=\frac{{\int }_{{A}_{1}}{E}_{1}\text{ }\text{d}{A}_{1}}{{M}_{2}}={\int }_{{A}_{1}}{c}_{12}\text{ }\text{d}{A}_{1}$ ar عامل الترتيب de ..... (zwischen zwei Flächen S1 und S2) es factor de configuración fi ….. it fattore di configurazione ko 입체각 투사율, <두 표면 S1 과 S2 사이> ja 立体角投射率 no nb konfigurasjonsfaktor nn konfigurasjonsfaktor pl współczynnik konfiguracji (między dwiema powierzchniami) pt factor de configuração (entre duas superfícies S1 e S2)