Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 46, Issue 9, Pages 12082-12107Publisher
WILEY
DOI: 10.1002/er.7972
Keywords
exergy; LNG regasification; molten salt; multi-objective optimization; SOFC; solar energy
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This study proposes a new system for solar power generation using a solar power tower and a molten salt cycle. The implementation of liquid natural gas (LNG) and a cascade organic Rankine cycle helps to increase energy consumption and optimize the system. The multi-objective optimization results show a total product cost rate of $115.3/h and an exergy efficiency of 71%. The heat exchangers for molten salt and LNG are identified as major factors for optimization.
This study presents a new system for solar power, which is generated through a solar power tower with a molten salt cycle. To increase the consumption of energy losses, besides the closed supercritical carbon dioxide (sCO2) Brayton cycle, a liquid natural gas (LNG) open-cycle was used as a heat sink alongside a cascade organic Rankine cycle with the capability of working at low temperatures. LNG is implemented for a solid oxide fuel cell input, after cooling down the power generation systems and power generation. Besides the economic and thermodynamic analysis, destruction of exergy has been controlled and parametric studies are performed to investigate the influence of relative factors on the performance of the system. To optimize the system, a genetics algorithm has been employed by considering two reciprocal objective functions of the total cost rate and the exergy efficiency. The results of multi-objective optimization show that the optimized point has a total product cost rate of $115.3/h and an exergy efficiency of 71%. Furthermore, exergy analysis shows that the molten salt heat exchangers and the LNG heat exchangers have the maximum rates of irreversibility and must be taken into consideration as a major priority for optimization.
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