This article is about a study on the effect of installing a curved venetian blind to the glass window on heat transmission to the space.
The curved venetian blind, whose optical properties are considered as nonspecular optical element, is modeled as an effective layer.
The mathematical model of the glass window installed with a curved venetian blind is developed by using matrix layer calculation method.
Empirical model of heat convection coefficient between the glass window and the venetian blind is adopted in the proposed mathematical model.
The effect of diathermanous layer on the radiative heat transfer between the glass window and space behind the installed venetian blind is also considered.
The predicted results from the mathematical model are verified with the experimental results.
The variation of the solar heat gain coefficient and overall heat transfer coefficient, which are the key parameters used to calculate the heat transmission through the glass window installed with venetian blind to the space inside, are studied.
It is found that installed the venetian blind behind the glass window significantly reduces the heat transmission through the space.
The reduction in heat transmission is greatly influenced by the characteristics of the venetian blind and the glass window such as the optical properties of the slat, the slat angle, the solar profile angle and the optical properties of the glass window.
It is also found that installed the high reflective blind (white blind) behind the glass window in certain slat angle and solar profile angle can reduce the solar heat gain coefficient as much as 59.7 percent compared to the plain glass window.