INFLUENCE OF LOUVER TILT ON HEAT GAIN AND DAYLIGHT THROUGH WINDOW GLAZING IN COMPOSITE CLIMATIC REGION OF INDIA
Glass is one of the most important building elements used in both residential and commercial building constructions. The visual and thermal comfort in the buildings can be maintained with the help of glass envelopes. The slant louvers are the window shading devices which are used to control both heat and daylight inside the buildings. The objective of this paper is to study the effect of louver angle on thermal and visual performance of the clear glass window. This paper presents the spectral characteristics of clear glass in the total solar spectrum region. These measured spectral characteristics were utilized to compute optical properties of clear glass as per the standards. The laterite building models (4m X 4m X 3.5m) with 40% window to wall ratio and louvers were designed using Design builder 4.3.0.039 simulation tool. The reinforced cement concrete and dense concrete were used for roof and floor construction, respectively. The thermal and daylight analysis of building models were carried out in Energy plus for composite climate (New Delhi) of India. The analysis was carried out for both summer and winter seasons of the composite climatic zone. The results revealed that the louver with 50° slant provided on the south window reduces heat gain by 32.21% with adequate daylight inside the building during summer. The slant louvers with 10° tilt on south window were preferred to gain 48.55% of heat during the winter season with adequate daylight inside the building. The results of the paper help in design of solar passive architecture.