Energy-exergy-economic (E3) analysis of stand-alone solar thermal cogeneration power plant Online publication date: Mon, 12-Mar-2018
by Prakash Saxena; K.S. Reddy
International Journal of Exergy (IJEX), Vol. 25, No. 3, 2018
Abstract: Concentrating solar power (CSP) based solar cogeneration plants are more energy efficient compared to single purpose power plants. In this paper, energy, exergy and economic analysis have been carried out for the stand-alone solar thermal co-generation power plant (SASTCPP), which is based on Rankine cycle. Both direct and indirect steam generation is adopted for the comparative E3 analysis. To achieve high energy efficiency, back pressure steam turbine with regenerative feed water heating is incorporated in power block. Reference cogeneration power plant has a capacity of 50 MWth. levelised cost of electricity (LCOE) associated to SASTCPP is calculated with three different cost allocation approach - direct, equivalent fuel consumption, and exergy approach. The observed exergy efficiency (33-35%) is comparatively less than energy efficiency (62-70%) and the maximum exergy destruction takes place within the solar field. Minimum LCOE calculated as Indian rupees (INR) 5.46 with direct steam generation (DSG).
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