But when the building is actually in use, most tenants usually install an indoor shading device behind the glass window to control the light transmission through the window into the room, to control heat gain through the window into the room and also to control the privacy condition of the tenants.
One of the indoor shading devices that commonly used in the building is the venetian blind.
Therefore the understanding of the thermal performance of the glass windows installed with venetian blind becomes essential.
The glass is the substance whose optical properties are specular, while the optical properties of the venetian blind are considered nonspecular.
Therefore, it is much more complex in modeling the venetian blind for calculating its thermal performance when compared to the glass window.
Much work has been done about the heat transmission through the glass window installed with venetain blind.