12-14 September, 2011, Lucknow - Earth Science India

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National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow METAL OXIDES AS HUMIDITY SENSORS Richa Srivastava 1 , B.C. Yadav 1,2 , C.D. Dwivedi 3 1 Nanomaterials and Sensors Research Laboratory, Department of Physics, University of Lucknow, Lucknow-226007 2 Department of Applied Physics, Babasaheb Bhimrao Ambedkar University, Lucknow-226025, U.P., India 3 DRDO, MOD, GOI, DMSRDE, Kanpur email: richadolly@rediffmail.com Environment degrades materials and material degrades environment. Water, which is supposed to be the nectar on earth not only supports life on earth but at the same time, degrades the quality of life by its unique molecular arrangement. In our daily life we observe materials, which support our life style degrade due to rust, mold, mildew, rot, decay, wrapping, stretching, lumping, caking, agglomeration and decomposition. These are all common enough problems encountered in our daily life leading to reduced efficiencies and product wastage. It is interesting to note the root cause of all these problems and many more is the presence of moisture and humidity in the air. The storage manufacture and transportation of materials often take place in a humid environment which is not suited to moisture sensitivity of the material leading to deterioration of stored material, machinery equipment and reduced product appeal. Sensing humidity and controlling it for providing proper environment had been highly challenging since time immemorial. Authors have worked on many metal oxide systems e.g. Nb 2 O 5 , Nd 2 O 3, La 2 O 3, ZnO, ZnO-TiO 2 , ZnO-Nb 2 O 5 etc and found that metal cooxides work as better humidity sensors. Out of all investigated material, ZnO-Nb 2 O 5 cooxide gave highest sensitivity 19 MΩ/%RH and better reproducibility than others, with 5% hysteresis over entire range of RH and can be fabricated easily under limited cost. PASSIVE CONCEPT USED IN TOMB OF ALIYA BEGAM: A CASE STUDY Sachin Gupta and Usha Bajpai Renewable Energy Research Laboratory, Department of Physics, University of Lucknow, Lucknow 226 007. email: sachin.energy123@gmail.com, dr_ushabajpai@rediffmail.com Energy is the basic indicator of the development of a country and considerable energy is used in buildings for heating, cooling and lighting among others. Due to inappropriate design of the buildings, more energy is consumed. The last decade has 72
National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow witnessed a grave energy crisis in developing countries during summer season primarily due to cooling load requirements of the buildings. We can save a lot of energy by proper designing of the buildings. Our old architects have set an example of using solar passive concepts in buildings to fulfill the need of comfort like visual, thermal and acoustic without using any significant amount of energy. They had used different methods to reduce the cooling and heating load of houses and buildings in the most sustainable method. This paper describes solar passive heating and cooling concepts applied by our ancient architect to Tomb of Aliya Begam, Lucknow which is an Awadh architectural building. They used passive concept like dome roof, high roof and thick wall, octagonal shape of building to meet the needs of heating, cooling and natural lighting. The paper describes the results obtained on several parameters like U- value, R- value, time lag, decremental factor and day light factor concerning heating, cooling and natural lighting. The buildings which are designed with sustainable features like Tomb of Aliya Begam are advocated to reduce the comsumption of energy in buildings. CHARACTERIZATION OF SOLAR PHOTOVOLTAIC MODULES ON THE BASIS OF AMBIENT TEMPERATURE Rahnuma Siddiqui and Usha Bajpai Renewable Energy Research Laboratory, Department of Physics, University of Lucknow, Lucknow 226 007. email: rmsphy@gmail.com, dr_ushabajpai@rediffmail.com Solar photovoltaic modules are generally characterized in simulated conditions. On actual sites the performance of the modules may vary. An effort has been made to measure the performance of solar photovoltaic modules in different months at particular location i.e. Lucknow with respect to temperatures for the different seasons for a year. In this paper, data is presented for months of May, June, July and August. With the given data, an equation has been developed mathematically which is in good correlation with the measured data. It is helpful in developing a relation of the efficiency of modules with corresponding ambient temperatures. In this paper, only one climatic parameter has been considered i.e. ambient temperature, while considering all major parameters like temperature, humidity, wind velocity, cloud cover, dust etc, a standard equation can be developed which would be helpful in having a relation of all major climatic parameters with the performance of solar photovoltaic modules and the level of accuracy of proposing the efficiency of modules would increase while increasing the number of climatic parameters. 73
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12-14 September, 2011, Lucknow - Earth Science India

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