Enhancement in energy metrics of double slope solar still by incorporating N identical PVT collectors

•Double slope solar still integrated with N identical PVT-FPC has been analyzed.•Number of PVT-FPC collectors, mass flow rate and water depth have been optimized.•Energy matrices have been calculated on the basis of exergy as well as energy.•Cogeneration efficiency, production cost of water and elec...

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Bibliographic Details
Published in:Solar energy 2017-02, Vol.143, p.142-161
Main Authors: Singh, D.B., Tiwari, G.N.
Format: Article
Language:English
Subjects:
Cogeneration
Cogeneration efficiency
Electricity generation
Energy efficiency
Energy metrics
N identical PVT collectors
Optimization
Photovoltaic cells
Solar energy
Solar still
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Summary:•Double slope solar still integrated with N identical PVT-FPC has been analyzed.•Number of PVT-FPC collectors, mass flow rate and water depth have been optimized.•Energy matrices have been calculated on the basis of exergy as well as energy.•Cogeneration efficiency, production cost of water and electricity has been computed.•Results of the proposed system have been compared with results of previous researchers. In this paper, double slope solar still has been analyzed by incorporating N identical partially covered photovoltaic thermal (PVT) collectors under optimized condition to assess the enhancement in energy metrics. Number of collectors, mass flow rate and water depth of N identical partially covered PVT flat plate collector (N-PVT-FPC-DS) have been optimized for climatic condition of New Delhi. Subsequently, annual distillate output, energy, exergy, energy metrics, cogeneration efficiency and cost of distillate output have been computed for the proposed N-PVT-FPC-DS at 0.14m water depth. Results obtained have been compared with results reported by previous researchers and it has been concluded that the proposed N-PVT-FPC-DS performs better than double slope solar still incorporated with N identical PVT compound parabolic concentrator collectors (N-PVT-CPC-DS) and conventional double slope solar still (CDSSS) on the basis of energy metrics and cost of distillate output. The exergy based energy payback time is lower by 74.66% and 62.62%; energy production factor is higher by 43.30% and 38.14%; life cycle conversion efficiency is higher by 48.57% and 48.57% and cost of distillate output is lower by 35.37% and 4.88% for the proposed N-PVT-FPC-DS than N-PVT-CPC-DS and CDSSS respectively.
ISSN:0038-092X
1471-1257
DOI:10.1016/j.solener.2016.12.039