Countries, that located in the zone near the equator, have the better opportunity compared to countries in the other part of the world in harvesting solar radiation to use as the auxiliary energy.
But having high solar radiation also has certain disadvantages when considering in the aspect of building application in term of cooling load, especially building with large amount of glass window installed as building envelope.
Large air conditioning systems are usually required for removing the high solar cooling load from the buildings.
The best way to reduce the solar cooling load is to block the solar radiation from entering into the building inner space. Certain types of external shading device such as roof overhangs, horizontal and vertical projections are preferred to use for preventing the solar radiation from entering into the building.
But with certain types of building, such as high rise office building, etc, building equipped with the external shading devices may not be preferred.
In that case, installing the internal shading device behind the glass window can be another option for tenant to use for reducing heat transmission through building envelope apart from being used for controlling the light transmission and the
condition of privacy.
In this study, the curved venetian blind is chosen as the indoor shading device to be investigated.
The glass is the substance whose optical properties are specular, while the optical properties of the venetian blind are considered nonspecular.