configuration factor (between 2 surfaces S1 and S2) [c21, c12]

ratio of the irradiance or illuminance, E2 (or E1), at a point on surface S2 (or S1) due to the flux received from surface S1 (or S2), to the radiant exitance or luminous exitance, M1 (or M2), of surface S1 (or S2)


Unit: 1

NOTE The relation between the configuration factor, c, and the (mutual) exchange coefficient, g, is:


where Φ2 (or Φ1) is the radiant flux or luminous flux received over surface S2 (or S1) from surface S1 (or S2) and A2 (or A1) is the area of surface S2 (or S1)

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