The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
T.p. Ashok Babu - One of the best experts on this subject based on the ideXlab platform.
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Investigation of various wall and window glass material buildings in different Climatic Zones of India for energy efficient building construction
Materials Today: Proceedings, 2018Co-Authors: G Kiran Kumar, Samrend Saboor, T.p. Ashok BabuAbstract:Abstract The commercial and residential buildings consume about 33% of energy for cooling and day lighting in India. This paper presents the thermal performance of buildings constructed with various building and window glass materials in five different Climatic Zones of India such as hot and dry (Ahmedabad), moderate (Bangalore), cold (Guwahati), warm and humid (Madras) and composite (New Delhi) Climatic Zones. In this study, four building materials such as laterite stone, dense concrete, burnt brick and mud brick were selected and four window glass materials such as clear, bronze, green and bronze-reflective glasses were selected. The spectral optical properties of four glass materials were measured experimentally using Perkin-Elmer lambda 950 spectrophotometer from wavelengths ranging from 300 nm- 2500 nm. Total eighty building models were designed using Design builder 4.3.0.039 and thermal analysis was carried out in Energy plus 8.1 simulation tool. From the results, it is observed that mud brick with bronze-reflective glass window buildings were found to be energy efficient from the least heat gain point of view among eighty building models studied in five Climatic Zones of India. The results of the study help in selecting the best combination of building and window glass materials for reducing cooling loads in buildings of five different Climatic Zones of India.
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Experimental and Theoretical Studies of Window Glazing Materials of Green Energy Building in Indian Climatic Zones
Energy Procedia, 2017Co-Authors: G Kiran Kumar, Samrend Saboor, T.p. Ashok BabuAbstract: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.
Xiaosong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of Climatic Zones and field study on thermal comfort for underground engineering in China during summer
Sustainable Cities and Society, 2018Co-Authors: Yong Li, Shibin Geng, Yanping Yuan, Jing Wang, Xiaosong ZhangAbstract:Abstract The researches on thermal comfort for underground engineering are lacking in China. In this paper, ground temperature (Tg), ventilating sensible heat ratio (VSHR) of fresh air in 249 cities of different areas were calculated, and four Climatic Zones including Cold, Dry, Humid, Hot&Humid were established. Through field surveys from June 1 to September 30 during the period 2007–2015, larger amounts of measured data and 5862 effective questionnaires were obtained in non-air conditioned defense basement in the four Climatic Zones. Results showed that the mean thermal sensation (MTS) values did not agree with the values of PMV model. At the same operative temperature of 27 ℃, the values of MTS were 0.53, 0.47, 0.32 and 0.0 in Cold, Dry, Humid and Hot&Humid Climatic zone, respectively. When Top was more than 26 ℃, more than 84% of the occupants expect ‘no change’ in the four Climatic Zones, especially 91% in Hot&Humid zone. When relative humidity (RH) was more than 80%, most of the occupants’ thermal acceptability (TA) was less than −0.3. In addition, by using multiple regression techniques, the neutral temperature models were derived using the parameters of average outdoor temperature, Tg, RH and clothing value for different Climatic Zones.
Lian Zhang - One of the best experts on this subject based on the ideXlab platform.
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effects of wall configuration on building energy performance subject to different Climatic Zones of china
Applied Energy, 2017Co-Authors: L Y Zhang, Liwen Jin, Zhaoan Wang, Jiaye Zhang, Xuemin Liu, Lian ZhangAbstract:Abstract Building energy plays a significant role in total energy consumption in China. It is widely recognized that the insulation performance of the external envelops is a critical factor for energy consumption of building air conditioning system. In this study, the effects of building external wall’s insulation thickness and position on the heating and cooling loads of a commercial building studied for five cities from different Climatic Zones of China, namely, Harbin, Xi’an, Shanghai, Kunming and Guangzhou, are investigated numerically. The wall’s optimum insulation thicknesses of the building simulated in these cities are determined by the life cycle cost analysis (LCCA) method. Meanwhile, the different positions of insulation layer embedded in the wall are investigated in terms of the time lag and decrement factor. The results show that the increase of insulation thickness has a significant effect on the building heating load, inversely it exhibits a relatively small effect on the building cooling load. The analysis indicates that building energy savings vary from different Climatic Zones. For a given wall insulation and the same building conditions, the largest building energy savings are achieved in Harbin, and energy savings of other cities follow the order of Xi’an, Shanghai, Kunming and Guangzhou. The variation of building energy savings in Guangzhou is insignificant along with the increase of the insulation thickness. Using expanded polystyrene as insulation layer material, the optimum insulation layers of the building in Harbin, Xi’an, Shanghai, Kunming and Guangzhou are founded to be 80 mm, 60 mm, 40 mm, 40 mm, and 20 mm, respectively.
G Kiran Kumar - One of the best experts on this subject based on the ideXlab platform.
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Investigation of various wall and window glass material buildings in different Climatic Zones of India for energy efficient building construction
Materials Today: Proceedings, 2018Co-Authors: G Kiran Kumar, Samrend Saboor, T.p. Ashok BabuAbstract:Abstract The commercial and residential buildings consume about 33% of energy for cooling and day lighting in India. This paper presents the thermal performance of buildings constructed with various building and window glass materials in five different Climatic Zones of India such as hot and dry (Ahmedabad), moderate (Bangalore), cold (Guwahati), warm and humid (Madras) and composite (New Delhi) Climatic Zones. In this study, four building materials such as laterite stone, dense concrete, burnt brick and mud brick were selected and four window glass materials such as clear, bronze, green and bronze-reflective glasses were selected. The spectral optical properties of four glass materials were measured experimentally using Perkin-Elmer lambda 950 spectrophotometer from wavelengths ranging from 300 nm- 2500 nm. Total eighty building models were designed using Design builder 4.3.0.039 and thermal analysis was carried out in Energy plus 8.1 simulation tool. From the results, it is observed that mud brick with bronze-reflective glass window buildings were found to be energy efficient from the least heat gain point of view among eighty building models studied in five Climatic Zones of India. The results of the study help in selecting the best combination of building and window glass materials for reducing cooling loads in buildings of five different Climatic Zones of India.
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Experimental and Theoretical Studies of Window Glazing Materials of Green Energy Building in Indian Climatic Zones
Energy Procedia, 2017Co-Authors: G Kiran Kumar, Samrend Saboor, T.p. Ashok BabuAbstract: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.
S K Atreya - One of the best experts on this subject based on the ideXlab platform.
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adaptive thermal comfort model for different Climatic Zones of north east india
Applied Energy, 2011Co-Authors: Manoj Kumar Singh, Sadhan Mahapatra, S K AtreyaAbstract:Thermal comfort standards ISO 7730 and ASHRAE 55-2004 are based on the experimental results conducted in Climatic chambers and the adaptive opportunities are usually limited in these experiments. However, in naturally ventilated buildings, adaptive opportunities are not fixed and occupants always have the liberty to modify the opportunities in order to feel comfortable. A comfort survey has been carried out in three different Climatic Zones of North-East India in four different seasons of a year. Climatic parameters corresponding to actual mean vote (AMV) are recorded during the survey and the values are used to calculate the predicted mean vote (PMV) using ISO 7730 calculation procedures. Results show that the PMV deviates from AMV values. A corrective term [`]adaptive coefficient' is calculated based on PMV and AMV values and least square method to assess the different adaption used for thermal comfort. Theoretical adaptive models of thermal comfort have been developed based on these adaptive coefficients for the region. The adaptive coefficient values are varying for different seasons and also for different Climatic Zones. This reflects the various levels of adaptation in different seasons in a particular Climatic zone. This adaptive coefficient can be used as a reference to thermal comfort assessment of the buildings and also can be used as dynamic control of the set temperature in the air conditioning system, which will results enormous energy saving. Result of this study also contributes towards the debate over the applicability of PMV model to naturally ventilated building.