Effect of sky conditions on light transmission through a suspended particle device switchable glazing

•Correlation of SPD glazing transmittance and clearness index has been calculated.•Transmitted SE and SHGC were evaluated for different clearness index.•Single glazing transmittance was recommended for different azimuthal orientation of vertical plane SPD glazing.

A suspended particle device (SPD) switchable glazing changes its state from opaque to transparent in the presence of a power supply. SPD glazing's near normal transmission varies with incident angle and clearness index. Due to a lower diffuse component, higher glazing transmission ensues at higher clearness indices. Transmittance values for different azimuthal incident angle for a SPD glazing for its “transparent” and “opaque” states have been determined. In Dublin, below 0.5 clearness index, isotropic diffuse transmittance was prevailed while transmission of direct insolation was dominant above 0.5 clearness index. For south facing vertical plane SPD glazing transmittance in its transparent and opaque states are 0.25 and 0.025 respectively while clearness index is below 0.5.