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Item Effect of Different Double Glazing Window Combinations on Heat gain in Buildings for Passive Cooling in Various Climatic Regions of India(Elsevier Ltd, 2017) Gorantla, G.K.; Saboor, S.; Setty, A.B.T.P.The buildings account for more than 30% of energy consumption for cooling and day lighting in India. This paper presents the thermal performance of buildings with various double glazing window glass material combinations in four different climatic zones of India such as moderate (Bangalore), composite (Hyderabad) hot and dry (Jodhpur) and warm and humid (Vishakhapatnam) climatic zones. In this study, four double glazing window material combinations such as clear-clear, bronze-clear, green-clear and grey-clear were selected. An unventilated air space of 10 mm is maintained between the two glass layers. The spectral optical properties of four glass materials were measured experimentally using UV 3600 Shimadzu spectrophotometer from wavelengths ranging from 300 nm-2500 nm. Total sixty four building models were designed using Design builder 4.3.0.039 and thermal analysis was carried out using Energy plus 8.1 simulation tool. From the results, it is observed that concrete buildings with double grey-clear glass window were found to be energy efficient from the least heat gain point of view among sixty four building models studied in four climatic zones of India. The results of the study help in selecting the best combination of double glazing window glass material for reducing cooling loads in buildings of four different climatic zones of India. © 2017 Elsevier Ltd.Item Investigation of Various Low Emissivity Glass Materials for Green Energy Building Construction in Indian Climatic Zones(Elsevier Ltd, 2017) Gorantla, G.K.; Saboor, S.; Ashok Babu, T.P.A.The buildings are responsible for more than one-third of power consumption in India. Glass is one of the significant building enclosures to control cooling loads in buildings. This paper describes how various low emissivity glasses used for building windows affect thermal performance of green energy buildings. This paper presents the thermal performance of five double glazed low reflective window glass materials such as clear low reflective glass, bronze low reflective glass, green low reflective glass, grey low reflective glass and blue-green low reflective glasses. In this paper, mud brick buildings with five low emissivity glass material windows were designed in three different climatic zones of India such as warm and humid (Mangalore), hot and dry (Jodhpur) and composite (Hyderabad). The results showed that buildings with double glazed low emissivity grey glass window are found to be energy efficient from the least heat gain point of view among all buildings studied in three climatic zones of India. © 2017 Elsevier Ltd. All rights reserved.Item Thermal Analysis of Wall and Window Glass Materials for Cooling Load Reduction in Green Energy Building Design(Elsevier Ltd, 2017) Gorantla, G.K.; Saboor, S.; Ashok Babu, T.P.A.Buildings are responsible for huge amount of energy consumption for cooling in hot regions. Energy efficient material wall and window glass materials can reduce power consumption for cooling. This laterite stone, dense concrete, burnt brick and mud brick are used as building materials. The experimentally measured optical properties of four glass materials such as clear glass, bronze glass, green glass and bronze-reflective glasses have been presented in this paper. Spectrophotometer was utilised to measure the spectral optical properties in the infrared region. The heat gain in the building due to placing of window in four orientations (East, West, North and South) was analyzed for Mangalore city (12.870N, 74.880E) in Karnatka state, India. The building models were simulated in Energy plus tool for thermal performance. Total two fifty six building models were investigated. The mud brick buildings were observed to be the most energy efficient as they allow the least heat gain inside the building at all window to wall ratios. Use of reflective glass for the glazing of the window reduces cooling loads in buildings. © 2017 Elsevier Ltd.Item Experimental and Theoretical Studies of Window Glazing Materials of Green Energy Building in Indian Climatic Zones(Elsevier Ltd, 2017) Gorantla, G.K.; Saboor, S.; Ashok Babu, T.P.A.Buildings consume plenty of power for providing thermal and visual comfort inside the buildings. This paper aims at presenting the experimental results of spectral optical properties of the most widely used window glazing materials. The window glazing materials studied include clear glazing, bronze glazing, green glazing and grey coloured glazing materials. A Matlab code employing the British standard method was developed to compute transmittance and reflectance of window glasses at normal incidence angle. This code uses experimentally obtained spectral optical property data from Perkin Elmer lambda 950 spectrophotometer for the computation of transmission and reflection of window glasses. A computer program was developed for computing the total solar radiation passing through glass materials. The heat gain through different glass windows of eight coordinal orientations such as east, west, north, south, northeast, northwest, southeast and southwest in four climatic zones of India was investigated. The solar radiation through south oriented glass was found to be the least among all other orientations studied in four Indian climatic zones. The cooling load through south oriented bronze, glass, green glass and grey glass window were reduced by 23%, 31% and 37%, respectively, as compared to the south oriented clear glass window in four climatic zones of India. The grey glass window is observed to be the most energy efficient as it reduces maximum cooling loads within the building as compared to the other considered glazing materials. The results of this paper are helpful in designing energy efficient commercial buildings for reduced cooling loads. © 2017 The Authors.Item Study of Various Glass Materials to Provide Adequate Day Lighting in Office Buildings of Warm and Humid Climatic Zone in India(Elsevier Ltd, 2017) Gorantla, G.K.; Ashok Babu, T.P.A.A huge amount of energy is attributed to cooling, heating and day lighting in buildings. In the air conditioned space the windows have been closed and the sun control is used to reduce the radiation load. This results in low lumens of light in air conditioned space and demands the artificial lighting and increases the energy consumption for lighting and also the air conditioning load. The objective of this work is to allow the natural sun light through the glass window of same area, and thus less lighting load in the air conditioned space for different climatic conditions. To achieve the objective of the work an investigation of spectral properties of different glass materials such as bronze, green, grey, bronze-reflective, green-reflective and grey-reflective glasses is carried out experimentally using Perkin Elmer lambda 950 Spectrophotometer in the visible solar spectrum region of wavelength range from 380nm-780 nm, to provide optimum daylight factor as per SP: 41 1987 Indian standards to office buildings. The measured spectral properties were used to compute the visible solar properties in the visible region by using British standard method with a MATLAB code. The computed properties transmittance, reflectance and absorbance are used in the simulation tool for daylight calculations. The laterite building models with various window glazing materials were designed in Design builder 4.3.0.039 version tool and day lighting simulation was carried out in Energy plus 8.1.0.009 simulation tool for warm and humid climatic region of India. In this work, total twenty four building models with six window glass materials were investigated in four orientations of window such as East, West, North and South. The simulations were carried out in both summer and winter climates of warm and humid climatic zone for an office building. As far as the daylight factor is concerned, the green-reflective glass placed in south orientation is the best due to its adequate daylight factor (2.05% to 2.06%) in summer season and bronze glass window placed in north orientation is observed to be the best due to its sufficient daylight factor (2.2% to 2.8%) in winter among six studied window glass materials to Mangalore location (Latitude 12.87 N). The results of the study help in designing natural daylight buildings which in turn reduce energy consumption. © 2017 The Authors.