Solar gains of multi-glazing façade with venetian blind of specular reflection are modeled.
The model results fit well with the experimental results.
Some impact factors on the optical properties of multi-glazing façade are analyzed.
The impact of W/S, R, and φ on τt are not significant when β ≥ (90°-φ).
The impact of ξ and Pb depend on the solar profile angle “intersection point”.