EXPERIMENTAL INVESTIGATION OF THE HEAT TRANSFER THROUGH WINDOWS WITH INTERIOR BLINDS

Vijay Kumar, Anuranjan Sharda

Abstract: Windows are designed primarily to control the indoor climate and also to provide proper ventilation (air circulation). The primary objective is achieved by controlling the heat flow through the window from inside to outside in winter & from outside to inside in summer. Window solar gain has a strong influence on the building energy consumption and peak cooling load. Double glazed window are known to prevent the entry of solar gain to inside the room. Shading systems such as Venetian blinds, louver shades, draperies etc. enhances the control of solar gain through windows. In this paper the thermal performance of a double-glazed window with adjacent commercially available blinds has been studied using LBNL research software WINDOWS 6.3 and the results so obtained are validated using a Guarded Heat Plate Apparatus. Though this type of glazing system has already been studied for colder climatic conditions in the west, due to the unavailability of literature on local climatic conditions its use in tropical countries like India is limited. A parametric study for climatic conditions of an Indian city, Chandigarh has been made to give an insight to the thermal performance of glazing systems with interior blinds. In this study the effect of different parameters such as types of glazing systems (single and double glazed) , pane to blind spacing (20mm, 30mm and 40mm), the Slat angle (0o and 90o ) and the climatic conditions of Chandigarh (Hot and Dry, Hot and Humid, Cold and Dry) on the Thermal transmittance (U-value) is studied.

Keywords: Heat Transfer, Glazing, U-value, R-value

DOI: https://doi.org/10.15623/ijret.2013.0212013