BITS Faculty Publications

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    Comparative Life Cycle Assessments of Photovoltaic Thermal Systems with Earth Water Heat Exchanger Cooling
    (Elsevier, 2022) Sangwan, Kuldip Singh
    Photovoltaic (PV) technology is a commercially established technology for direct generation of electricity using solar energy. However, one drawback of this technology is that its electrical efficiency decreases with increase in panel temperature beyond standard surface temperature of 25°C. To maintain the panel surface temperature, photovoltaic thermal (PV/T) cooling technology with earth water heat exchanger (EWHE) could be a suitable solution for the arid and semi-arid regions. The current paper discusses a comparative Life Cycle Analysis (LCA) of the standalone PV and PV/T systems coupled with EWHE cooling for the conditions of Pilani, Rajasthan, India. The main purpose of the study is to evaluate environmental performance analysis for forced cooling (PV/T+EWHE). Environmental performance of the system was evaluated through cradle-to-grave LCA which was carried out by using Umberto NXT software. The life cycle assessment showed that PV, PV/T and EWHE devices consumes large amount of energy during fabrication and installation process. It was also found out that PV/T+EWHE system has huge environmental impacts, in various midpoint and endpoint impact categories, as compared to normal PV system. But on the other hand, the electrical energy performance was better for PV/T+EWHE system as compared to normal PV system. Finally, it was concluded that, large PV/T+EWHE based power plants would be more sustainable in terms of environmental and energy performance.
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    Comparative thermal performance of static sunshade and brick cavity wall for energy efficient building envelope in composite climate
    (Doiserbia, 2014) Gupta, Rajiv; Charde, Meghana
    Energy efficient building technologies can reduce energy consumption in buildings. In present paper effect of designed static sunshade, brick cavity wall with brick projections and their combined effect on indoor air temperature has been analyzed by constructing three test rooms each of habitable dimensions (3.0 m × 4.0 m × 3.0 m) and studying hourly temperatures on typical days for one month in summer and winter each. The three rooms have also been simulated using a software and the results have been compared with the experimental results. Designed static sunshade increased indoor air temperature in winter while proposed brick cavity wall with brick projections lowered it in summer. Combined effect of building elements lowered indoor air temperature in summer and increased it in winter as compared to outdoor air temperature. It is thus useful for energy conservation in buildings in composite climate.