Workplane illuminances monitored within a scale model placed in two different considered locations (cf. Figure 1.b) overestimate daylighting performances of the test module. Figures 7 and 9 illustrate the observed discrepancies, which remain constant and close to 35 — 40% in relative terms for all profile positions. It shows that moving the model from one location to the other has no impact on the remaining divergence (0 — 1% percent-point reduction) : this indicates that the different sky view factors and external reflected component are apparently not responsible for the remaining discrepancy (cf. Table 3).

a. b. c.

Figure 7: Comparison of relative divergence between illuminances monitored in the test

module and in scale model 2 a. 2.2 m., b. 4.2 m., c. 6.2 m from window side.