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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 Study of Various Glass Window and Building Wall Materials in Different Climatic Zones of India for Energy Efficient Building Construction(Elsevier Ltd, 2017) Kumar, G.K.; Saboor, S.; Ashok Babu, T.P.A.The commercial and residential buildings consume about 33% of energy for cooling and day lighting in India. This paper aims to present thermal performance of buildings constructed with various building and window glass materials in five different climatic zones of India. The climates considered include: hot and dry (Ahmedabad), moderate (Bangalore), cold (Guwahati), warm and humid (Madras), and composite (New Delhi). In this study, four building materials such as laterite stone, dense concrete, burnt brick, and mud brick were selected and four glasses such as clear, bronze, green, and bronze-reflective glasses were used for windows. Spectral characteristics of four glasses were measured experimentally by using Perkin-Elmer lambda 950spectrophotometer in the wavelength range of 300 -2500 nm as per ASTM standards. A mat lab code was developed to compute the solar optical properties such as transmittance and reflectance of glasses as per European standards in entire solar spectrum region. The building models were designed in Design builder 4.3.0.039 and thermal analysis was carried out in Energy plus 8.1.0.009. The solar heat gain in buildings was investigated. The results revealed that the mud brick wall building with south bronze-reflective glass window as energy saving from the least heat gain point of view among eighty building models studied. The results also showed that the mud brick wall building with bronze, green and bronze reflective window glasses reduces heat gain through wall by 2.52%, 3.83%, and 6.46% as compared to the mud brick wall building with clear glass window. The results helps in selecting energy saving combination of wall envelope and window glass materials for reducing air-conditioning loads in residential and commercial buildings of five different climatic zones of India. © 2017 The Authors. Published by 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.