1009 shared publications
Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Canada
437 shared publications
Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario, L1G 0C5, CANADA
39 shared publications
Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe St. North, Oshawa, Ontario, L1H 7K4, CANADA
(2011 - 2018)
With the rapid depletion of fossils fuels, scope for renewable energy like solar energy is huge. The efficiency of photovoltaic cells to convert the solar energy into electricity drops with the rise in temperature due to increased resistance. Thus improving the efficiency by lowering the thermal resistance and allowing the cooling fluid (air/water) to flow through photovoltaic thermal (PVT) system is an attractive engineering problem. In the present study, performance analysis of single glazed solar PVT air collector on the basis of energy and exergy has been analyzed for the climatic conditions of Silchar, India for the month of May, 2017. An analytical model is developed to evaluate the hourly variation of PV cell temperature, cell efficiency, useful thermal heat gain, useful electrical heat gain, energy efficiency and exergy efficiency PVT system. Results depict that efficiency of PV cell decreases with the increase in temperature, and a maximum efficiency of 14.6% for the PV module is found. Out of total useful heat output, electrical heat output contributes 67% while the rest is thermal heat output. Further, magnitude of both the heat output is found to increase with the solar radiation and the maximum is observed at around 1230 hrs. Trend of both energy and exergy efficiency is similar except the magnitude. Maximum efficiency observed to be 69% and 16.5% for energy and exergy respectively.
Investigations on exergy resources are important from the point of energy sustainability. In the presented study an energy and exergy analysis of the operating biomass and natural gas boilers at the University of Idaho (UI) district energy plant is conducted. Exergy flows through the components of the steam cycle associated with the biomass boiler are quantified to identify major sources of exergy destruction in the district heating system. It is found that the biomass boiler has reduced energy and exergy efficiency compared to the natural gas boilers. Thermal efficiency varies from 76% to 85%, while exergy efficiency is significantly lower at 24% to 27% for all the boilers. Exergy accounting reveals that the biomass boiler and furnace account for the greatest exergy destruction, at approximately 68% of the exergy provided by the fuel. Steam use on campus represents about 6% of exergy losses while the pressure reducer is responsible for 3.5%.