4-E (energy-exergy-environmental-economic) analyses of line-focusing stand-alone concentrating solar power plants

In this study, energy-exergy-environmental-economic (4-E) analyses of stand-alone line-focusing concentrating solar power plants are carried out for different plant capacities ranging from 1 to 50 MWe. Solar power plants based on concentrating power technologies are used to harness the solar radiation effectively. Among the solar power technologies, line-focusing concentrating systems such as linear Fresnel reflector (LFR) and parabolic trough collector (PTC) are simple in design and cost-effective with high dispatchability. The energy and exergy efficiencies of various components of the solar field and power block are determined. The overall energy and exergy efficiencies of 50-MWe LFR power plants are estimated as 12.17 and 17.21% and 23.16 and 32.76%, respectively, for the PTC power plant. The results show that a maximum energy loss occurs in the solar field and power block for LFR and PTC power plants respectively, and a maximum exergy loss occurs in the solar field for both power plants. The analyses of solar power plants have been carried out to estimate the environmental benefits; the results showed that a 1-MWe stand-alone line-focusing concentrating solar power plant can save 1813 tonnes of CO2, 12.52 tonnes of SO2, 6.23 tonnes of NOx and 0.98 tonnes of particulate matter annually compared with that of an Indian subcritical coal power plant. The levelized electricity cost for the LFR-and PTC-based stand-alone solar power plant varies from INR 14.77 to INR 10.19 and INR 14.7 to INR 8.48 for the plant capacities that vary from 1 to 50 MWe.